英语词汇“egg cell”造句的方法、技巧、例句及翻译-英语例句辞典

In the summer of 1902, working on grasshopper sperm and egg cells—which have particularly gigantic chromosomes—Sutton also postulated that genes were physically carried on chromosomes. The Gene 2016-06-02T00:00:00Z

Weismann had proposed a radical alternative: perhaps hereditary information was contained exclusively in sperm and egg cells, with no direct mechanism for an acquired characteristic to be transmitted into sperm or eggs. The Gene 2016-06-02T00:00:00Z

Cape buffalos are notoriously bad-tempered and dangerous animals and Vasti was sedated when her oocytes, or egg cells, were extracted using a technique similar to that used on human donors. South Africa unveils test-tube buffalo, plans IVF rhino 2016-09-23T04:00:00Z

The technique was pioneered by the Cambridge physiologist Robert Edwards, working with obstetrician Patrick Steptoe of Oldham general hospital, who first reported successful fertilisation of a human egg cell in vitro in 1969. Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z

The fertilisation of a human egg cell by a sperm was first observed under the microscope 99 years before Louise Brown was born, by the Swiss zoologist Hermann Fol. Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z

In order for a plant to seed, its egg cells must be pollinated. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z

In the long term, they contain potential for finding new ways of treating infertility, or vice versa, of preventing the sperm from fertilising the egg cell. Membrane transporter ensures mobility of sperm cells 2023-10-26T04:00:00Z

The Wolbachia rescue their host population through several strategies, including restoring fruit fly stem cells and ensuring that egg cells properly develop. Bacteria can enhance host insect's fertility with implications for disease control 2023-10-24T04:00:00Z

The 100 or so organelles in sperm are swamped by hundreds of thousands of mitochondria embedded in each egg cell -- each carrying the 37 genes in mitochondrial DNA. Mature sperm lack intact mitochondrial DNA 2023-09-18T04:00:00Z

But those offspring were made by tinkering with egg cells in laboratory dishes rather than by giving female animals the capacity for virgin birth, also known as parthenogenesis. ‘Virgin Birth’ Engineered into Female Animals for First Time 2023-08-01T04:00:00Z

When doctors expressed concern about her fertility and the egg cells she could be jeopardizing by working so closely with radioactive material, Leona shrugged off their concern. What the Film Oppenheimer Probably Will Not Talk About: The Lost Women of the Manhattan Project 2023-07-20T04:00:00Z

The sperm cells cannot reach and fertilise the egg cell. Membrane transporter ensures mobility of sperm cells 2023-10-26T04:00:00Z

When parthenogenesis happens, the egg cell in the female's body divides enough times it needs in order to create half the genes required to procreate. Why a crocodile’s ‘virgin birth’ isn’t a miracle 2023-06-10T04:00:00Z

It won’t necessarily be genetically identical to the mother though – this depends on how the egg cell develops. Crocodile’s ‘Virgin Birth’ Is a First for Science’s History Books 2023-06-09T04:00:00Z

DNA is removed from a camel egg cell and replaced with DNA from a frozen body cell of a camel prized for some quality such as speed or beauty. Dubai camel cloning caters to races, beauty pageants 2023-05-25T04:00:00Z

Male gametes reach female gametophyte and the egg cell gamete though a pollen tube: an extension of a cell within the pollen grain. Fundamentals of Biology 2015-01-01T00:00:00Z

In reproductive cloning, a donor nucleus is put into an enucleated egg cell, which is then stimulated to divide and develop into an organism. Concepts of Biology 2013-04-25T00:00:00Z

Meanwhile, other groups were figuring out how to coax egg cells to develop into embryos without being fertilized. ‘Game changer.’ Scientists are genetically engineering crops to clone themselves 2023-05-17T04:00:00Z

Then, through a process that involved growing them and treating them with a drug, they converted male mouse stem cells into female cells and produced functional egg cells. For 1st time, scientists create mice with cells from 2 males 2023-03-15T04:00:00Z

Previously egg cell creation began with stem cells from a female animal. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z

The mature embryo sac contains one egg cell, two synergids or “helper” cells, three antipodal cells, and two polar nuclei in a central cell. Fundamentals of Biology 2015-01-01T00:00:00Z

The approach to producing an artificially cloned individual is to take the egg cell of one individual and to remove the haploid nucleus. Concepts of Biology 2013-04-25T00:00:00Z

The edited genome would then be implanted into an egg cell of that related species to develop. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z

Next the team tested the device within a living system: the egg cell of the African clawed frog, a model organism. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z

In the ovary, the manipulated cell developed into an egg cell, or oocyte. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z

At fertilization, one of the sperm cells will finally unite its haploid nucleus with the haploid nucleus of a haploid egg cell. Fundamentals of Biology 2015-01-01T00:00:00Z

Then a diploid nucleus from a body cell of a second individual, the donor, is put into the egg cell. Concepts of Biology 2013-04-25T00:00:00Z

Cloning requires access to an egg cell that is ready for fertilization but not yet fertilized. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z

After these insertions, the egg cells looked healthy under a microscope and had not sprung any leaks. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z

Telfer is particularly concerned by how few of the artificial egg cells grew into living mice. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z

The egg cell and two other cells called synergids are at the micropylar end. Fundamentals of Biology 2015-01-01T00:00:00Z

In the procedure, the DNA from an adult human is introduced into a human egg cell, which is then stimulated to divide. Concepts of Biology 2013-04-25T00:00:00Z

“There is no access to a bird egg cell at the same developmental time as there is for a mammal,” he explains. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z

While inside the egg cell, the Cell Rover was able to receive an electromagnetic transmission and send a responding signal outward, up to a distance of one centimeter. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z

Safeguarding the placenta would be particularly important, as retroviruses that infected an embryo early enough in development could get into sperm and egg cells. Ancient virus may be protecting the human placenta 2022-10-27T04:00:00Z

However, early embryonic development requires the cytoplasmic material contained in the egg cell. Biology for AP Courses 2022-06-09T00:00:00Z

One of the sperm cells will finally unite its haploid nucleus with the haploid nucleus of an egg cell in the process of fertilization. Concepts of Biology 2013-04-25T00:00:00Z

In many marine organisms, males and females release their sperm and egg cells to mix in the water. Is this pillbug-like organism a pollinator of the sea? 2022-07-27T04:00:00Z

The male gametes are usually called sperm, and the female gametes are called egg cells. Miller & Levine Biology 2018-01-01T00:00:00Z

The fertilized egg cell, or zygote, starts dividing to generate the cells that make up an entire organism. Anatomy and Physiology 2013-06-19T00:00:00Z

Fusion of the gametes gives rise to a fertilized egg cell, or zygote. Biology for AP Courses 2022-06-09T00:00:00Z

A human egg cell can reach about 120 microns in diameter, or five one-thousandths of an inch. You Don’t Need a Microscope to See the Biggest Bacteria Ever Found 2022-06-23T04:00:00Z

In the case of Gracilaria, however, things are more complicated: The female alga doesn’t release its egg cells, but keeps them inside funnel-shaped filaments. Is this pillbug-like organism a pollinator of the sea? 2022-07-27T04:00:00Z

Maternal inheritance occurs because chloroplasts and mitochondria are inherited from the maternal gamete, or egg cell. Miller & Levine Biology 2018-01-01T00:00:00Z

You developed from a single fertilized egg cell into the complex organism containing trillions of cells that you see when you look in a mirror. Anatomy and Physiology 2013-06-19T00:00:00Z

Fusing a ferret fibroblast with an egg cell made an embryo, and a clone - Elizabeth Ann the black-footed ferret - was born in December of 2020. Extinction: Why scientists are freezing threatened species in 'biobanks' 2022-05-19T04:00:00Z

A common procedure for families who have trouble conceiving, IVF involves fertilizing a human egg cell outside of the human body, then re-implanting it in one's uterus and carrying it to term. How abortion "trigger laws" could inadvertently impede fertility treatments 2022-05-10T04:00:00Z

In this cloning technology, technicians replace the nucleus of an egg cell with a nucleus taken from a body cell. In a conservation first, a cloned ferret could help save her species 2022-01-13T05:00:00Z

Each gametophyte produces reproductive cells called gametes, also known as sperm and egg cells. Miller & Levine Biology 2018-01-01T00:00:00Z

Beating cilia on cells in the female fallopian tubes move egg cells from the ovary towards the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z

"The team has reached the decision to retire the older of the two remaining females, 32-year-old Najin, as a donor of egg cells," Biorescue said in a statement, citing ethical considerations. One of world's last two northern white rhinos dropped from race to save the species 2021-10-21T04:00:00Z

This DNA is passed from mother to child in the egg cell. 'I was found wrapped in my mum's coat - but who am I?' 2020-07-18T04:00:00Z

This method is faster than those that involve altering sperm or egg cells. From Hamsters to Baboons: The Animals Helping Scientists Understand the Coronavirus 2020-05-14T04:00:00Z

When mature, each gametophyte contains a few large egg cells, which can be fertilized by sperm. Miller & Levine Biology 2018-01-01T00:00:00Z

The only flagellated cell in humans is the sperm cell that must propel itself towards female egg cells. Anatomy and Physiology 2013-06-19T00:00:00Z

Scientists hope to implant embryos made from the rhinos' egg cells and frozen sperm from deceased males into surrogate mothers. One of world's last two northern white rhinos dropped from race to save the species 2021-10-21T04:00:00Z

Together with the nuclear-transfer studies, these pivotal experiments established that factors produced in egg cells and differentiated cells are able to direct cell fate by regulating gene expression. Cell identity reprogrammed 2019-10-13T04:00:00Z

Sarah also talks with Jennifer Gruhn, a postdoctoral research fellow at the University of Copenhagen Center for Chromosome Stability, about counting chromosomes in human egg cells. Privacy concerns slow Facebook studies, and how human fertility depends on chromosome counts 2019-09-26T04:00:00Z

Mitochondria provide a cell with energy; in bears as in humans, mitochondria and their DNA are inherited only from mom through the egg cell. Humans pushed cave bears to extinction, their DNA suggests 2019-08-15T04:00:00Z

Another major project, made possible because of the worm’s transparency, was to track the lineage of all 959 cells in the adult worm’s body, starting from the single egg cell. Sydney Brenner, a Decipherer of the Genetic Code, Is Dead at 92 2019-04-05T04:00:00Z

The researchers in Hunt’s lab were studying this process when suddenly the egg cells of their mice--including the ones that were supposed to be normal--started showing major genetic abnormalities. What a strange case of scientific déjà vu showed us about the dangers of plastics 2019-03-18T04:00:00Z

In the authors’ experiments, donor nuclei from cells at various developmental stages, from early blastomeres to cells from tadpoles just before hatching, were transferred into Xenopus egg cells. Cell identity reprogrammed 2019-10-13T04:00:00Z

But no one can explain exactly how, say, changes in brain cells caused by abuse could be communicated to fully formed sperm or egg cells before conception. Can We Really Inherit Trauma? 2018-12-10T05:00:00Z

Then she exposed immature frog egg cells—a common model in cell physiology—to the venom and measured ion movement using electrophysiological techniques. Jellyfish almost killed this scientist. Now, she wants to save others from their fatal venom 2018-11-08T05:00:00Z

Scientists in Japan made progress recently in the quest to combat infertility, creating the precursor to a human egg cell in a dish from nothing but a woman’s blood cells. The 'game-changing’ technique to create babies from skin cells just stepped forward 2018-09-20T04:00:00Z

The stem cells will be turned into germ cells — sperm and egg cells. Second rhino pregnancy signals hope for nearly extinct subspecies 2018-09-18T04:00:00Z

At the time, dogs from Korean meat farms were used, for egg cells and as surrogates, and returned to the farms they came from to be raised and sold as meat. What a dog-cloning expert would have told Barbra Streisand: ‘Nooooooo!’ 2018-03-07T05:00:00Z

The Amazon molly’s egg cells are activated to develop into an embryo by a sperm cell that degenerates without fusing with the egg’s nucleus. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z

For Ross, the most exciting application depends on his team now figuring out how to develop these ES cells into cattle sperm and egg cells. First cow embryonic stem cells could lead to healthier, more productive livestock 2018-02-05T05:00:00Z

This involves transferring DNA from the nucleus of a cell to a donated egg cell that is then prompted to develop into an embryo. First monkey clones created in the lab 2018-01-24T05:00:00Z

Some of them became “primordial germ cells,” precursors of both sperm and egg cells. Second rhino pregnancy signals hope for nearly extinct subspecies 2018-09-18T04:00:00Z

Still, while it would be easy to inject the DNA into an egg cell in a lab, it’s a little hard to imagine that transfer happening in nature. The Grinch’s cardiologist, and other researchers make sense of Christmas tales 2017-12-24T05:00:00Z

The fish reproduces using a strategy in which a female’s egg cell develops into a baby without being fertilized by a male’s sperm cell. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z

Still, while it would be easy to inject the DNA into an egg cell in a lab, it’s a little hard to imagine that transfer happening in nature. The Grinch needs a good cardiologist, and other holiday stories explained by scientists 2017-12-22T05:00:00Z

Sperm divide more often than egg cells do. The link between autism and older parents is clear, but the why is not 2017-12-15T05:00:00Z

In the United Kingdom and Hungary, neonic compounds seemed to reduce worker-bee numbers in honeybee hives; in Hungary, researchers also saw fewer egg cells in these hives, an indication of reduced reproductive success. The bitter battle over the world’s most popular insecticides 2017-11-07T05:00:00Z

One way is how Dolly the sheep was cloned, by taking the part of the egg cell that contains genetic information and replacing it with a donor’s cell nucleus. Orphan Black is ending, but how far has human cloning come? 2017-08-11T04:00:00Z

The bulk of the mother’s genome is tangled in the egg’s nucleus, but separate strands of DNA floating in the egg cell build the body’s energy generators, the mitochondria. The 'three-parent baby' fertility doctor needs to stop marketing the procedure, FDA says 2017-08-05T04:00:00Z

The number of de novo mutations in egg cells increases with age, although to a lesser degree than it does in sperm. The link between autism and older parents is clear, but the why is not 2017-12-15T05:00:00Z

In Germany, however, the honeybee hives exposed to neonics had more egg cells — a puzzling result. The bitter battle over the world’s most popular insecticides 2017-11-07T05:00:00Z

In these embryos, the sperm cell’s mutant gene ignored that template and instead copied the healthy DNA sequence from the egg cell. In Breakthrough, Scientists Edit a Dangerous Mutation From Genes in Human Embryos 2017-08-02T04:00:00Z

These changes would also survive into that individual’s sperm or egg cells and would be passed on to future generations as well. Researchers Use Gene Editing in Human Embryos to Fix Disease 2017-07-27T04:00:00Z

They arise when viruses integrate into the genome of sperm or egg cells, and thus get passed down from one generation to the next. Medicine's Movable Feast: What Jumping Genes Can Teach Us about Treating Disease 2017-07-26T04:00:00Z

Its sperm and egg cells will thus bear two copies of the new gene, which radically increases the odds that its offspring will inherit it. How will we keep controversial gene drive technology in check? 2017-07-19T04:00:00Z

The process begins when a gene for a molecule with a potentially toxic function, like a protein-chopping enzyme, is accidentally duplicated, typically during the formation of egg cells and sperm. Moonlighting Genes Evolve for a Venomous Job 2017-07-10T04:00:00Z

The procedure, called mitochondrial replacement therapy, allows researchers to replace the faulty mitochondria in a woman’s egg cells with those from a healthy donor. United Kingdom moves forward with controversial embryo technique 2017-03-16T04:00:00Z

Giving new meaning to the term “test-tube babies,” this year, researchers in Japan produced mouse pups from egg cells grown entirely in a lab dish. From AI to protein folding: Our breakthrough runners-up 2016-12-22T05:00:00Z

Mitochondria are the little powerhouses in the cytoplasm, the liquid part of the egg cell outside the nucleus. The kids are all right: Children with 3-way DNA are healthy 2016-10-26T04:00:00Z

The researchers transplanted the nucleus of one of the woman’s egg cells into a donor egg, leaving the donor’s healthy mitochondria intact. Reports of 'three-parent babies' multiply 2016-10-18T04:00:00Z

The method involves removing the nucleus—the bulk of a cell’s DNA—from one of the mother’s egg cells, and inserting that nucleus into a donor egg cell stripped of its own nucleus. Unanswered questions surround baby born to three parents 2016-09-27T04:00:00Z

In the procedure, Perry's team used chemicals to manipulate an unfertilized egg cell into becoming something different -- a "fake" embryo. Health Highlights: Sept. 14, 2016 2016-09-14T04:00:00Z

In 2012, the same researchers took the first key step: They made fertile egg cells from stem cells. From AI to protein folding: Our breakthrough runners-up 2016-12-22T05:00:00Z

For better or worse, egg cells are still irreplaceable. ‘Motherless babies!’ How to create a tabloid science headline in five easy steps 2016-09-14T04:00:00Z

The team of researchers proposed the futuristic scenario after producing a litter of healthy mice with a technique that bypasses the normal step of fertilising an egg cell with sperm. Skin cells might be used instead of eggs to make embryos, scientists say 2016-09-13T04:00:00Z

In the early 2000s, Chinese investigators transferred3 the nuclei of human skin cells to cultured rabbit egg cells in an attempt to produce humanized stem cells. Bioethics in China: No wild east 2016-06-21T04:00:00Z

But in their latest study, they triggered unfertilized human egg cells to divide. Scientists Say They've Created New Type of Stem Cells 2016-03-16T04:00:00Z

And although previous work has suggested that sperm cells can carry 'epigenetic' factors, this is the first time that such an effect has been observed with egg cells. High-fat diets raise risk of obesity in offspring 2016-03-13T05:00:00Z

In addition, the egg cell contains powerful, as yet unknown factors that enable it to direct the first steps of embryo development. ‘Motherless babies!’ How to create a tabloid science headline in five easy steps 2016-09-14T04:00:00Z

By using those to fertilize egg cells from other mice, the research team was able to prove their viability. Researchers made sperm-like cells and used them to create new mice 2016-02-25T05:00:00Z

Then they injected these spermlike cells into mouse egg cells and transferred the embryos into female mice. In Mice, Scientists Turn Stem Cells Into Sperm 2016-02-25T05:00:00Z

Other efforts to generate embryonic stem cells using just human egg cells did not work, the researchers noted. Scientists Say They've Created New Type of Stem Cells 2016-03-16T04:00:00Z

One is that it occurs through chemical modifications of DNA called methylations, and another is that short RNA chains called microRNAs are inherited in the sperm or egg cell along with the DNA. High-fat diets raise risk of obesity in offspring 2016-03-13T05:00:00Z

At least some males at every site had female egg cells. Why Are These Males Growing Eggs?

He first used sophisticated microscopes to examine extracts from frog egg cells, quantifying microtubule density, orientation and stresses during spindle formation. The physics of life 2016-01-04T05:00:00Z

The research team used mouse embryonic stem cells and turned them into spermlike cells that were injected into egg cells to create embryos. In Mice, Scientists Turn Stem Cells Into Sperm 2016-02-25T05:00:00Z

Larger-scale breeding operations are more likely to use in vitro techniques: inseminating many egg cells from a given cow in a Petri dish, creating dozens of embryos instead of a handful. Holy cow! A farmer tries to make a better calf through genomic analysis. 2015-11-30T05:00:00Z

“The treatments are to do with developing egg cell treatments to help the IVF procedure … Does anyone else have any information?” Feature: A controversial company offers a new way to make a baby 2015-11-05T05:00:00Z

The older donors were given higher doses of hormonal drugs and produced fewer egg cells. Good Results From IVF Egg Donors Over Age 35 2015-10-20T04:00:00Z

A. The development of offspring from unfertilized egg cells is called parthenogenesis. A Mother’s Ability to Reproduce All by Herself 2015-10-19T04:00:00Z

The original DNA molecule present in a fertilised egg cell is copied and recopied trillions of times over the course of an organism’s life. Wisdom, ancient and modern 2015-10-07T04:00:00Z

This shuffling occurs when egg cells are first being created. Flies that fight off parasites produce offspring with greater genetic mix 2015-08-12T04:00:00Z

Experts believe the heightened risk of autism among older parents might be linked to genetic mutations in the sperm or egg cells. Study: Parents' Ages Linked to Autism Risk 2015-06-17T04:00:00Z

The one that eventually becomes the egg cell retains key cellular structures and the gel-like cytoplasm. Scientists document Florida 'virgin births' of endangered sawfish 2015-06-01T04:00:00Z

“What are the consequences” of adding mitochondria to an egg cell? he asks. Controversial fertility treatments focus on eggs’ power plants 2015-03-30T04:00:00Z

These are normally created naturally when an egg cell divides after it is fertilised by a sperm. Biological Babies For Same-Sex Parents a Possibility After Stem Cell Breakthrough 2015-02-25T05:00:00Z

Mitochondria are passed on through the egg cell, so the diseases are inherited through the mother. Mitochondrial gene therapy passes final U.K. vote 2015-02-24T05:00:00Z

Researchers can harvest thousands of egg cells from mice without difficulty. Can scientists bring mammoths back to life? 2015-02-06T05:00:00Z

In making an egg cell, a precursor cell divides into four cells. Scientists document Florida 'virgin births' of endangered sawfish 2015-06-01T04:00:00Z

A somatic cell, which isn’t from a sperm cell or egg cell, contains the complete DNA of the animal. Appeals court: Quarter horse group may reject clones 2015-01-14T05:00:00Z

But the mother also provides the rest of the egg cell, including membranes and organelles and enzymes and, crucially, energy generating units called mitochondria that have their own genetic material, completely independent of the father. Female Vikings? That's Just 'Vrøvl' 2014-12-08T05:00:00Z

Rather, these mutations arose during the creation of a father’s sperm cell or mother’s egg cell, they found. Autism linked to dozens of genetic mutations in major new studies

This prevents egg cells from reaching the uterus. Trying to limit the number of deer, with surprising results

These cancers arise from stray sperm or egg cells that travel to other parts of the body and become cancerous tumors. Kidney and Thyroid Cancer Rates Up Among U.S. Children, Study Finds 2014-09-08T04:00:00Z

But some aspects of these observations aren’t altogether novel, given that there are other animal species where sperm cells move through the body cavity before fertilizing egg cells. Scientists discover 'killer' roundworm sperm 2014-07-29T04:00:00Z

In the study, 72 percent of nearly 3,000 mouse egg cells survived. How to Get New Genes Into a Cell 2014-06-26T04:00:00Z

In the 1980s, embryologists working with mice had begun using 'pronuclear transfer' techniques to investigate the developmental role of egg cells' cytoplasm. Reproductive medicine: The power of three 2014-05-20T04:00:00Z

Fertilization takes place when an egg cell and a sperm cell recognize one another and fuse to form an embryo. Oh baby: Scientists find protein that lets egg and sperm hook up 2014-04-16T18:48:19Z

The particular piece of DNA we were looking at was part of the mitochondrial genome—mtDNA, for short—that is transmitted in the egg cells of all mothers to their children. The Hunt for Neandertal Genes [Excerpt] 2014-02-22T12:00:00Z

The FDA regulates blood, cartilage, bone, skin and egg cells as human tissues or under similar customized statutes. Policy: How to regulate faecal transplants 2014-02-19T18:50:53.475Z

What's most important is whether the ES cells' mitochondrial DNA matches that of the egg cell donor and whether the nuclear DNA matches the cell that was cloned. Mislabeled Images Bedevil Landmark Cloning Paper 2013-05-23T23:40:00Z

Human egg cells are one-tenth of a millimetre wide, and pronuclear transfers must be done under a microscope, in a specially designed chamber that controls temperature and air flow. Reproductive medicine: The power of three 2014-05-20T04:00:00Z

The females of these mice were infertile because their egg cells did not fuse with sperm. Oh baby: Scientists find protein that lets egg and sperm hook up 2014-04-16T18:48:19Z

Mitapilov and his team took donated egg cells and swapped their nuclei for the nuclei of cells from fetal tissue. Viable Human Embryonic Stem Cells Created By Cloning 2013-05-17T12:47:40Z

He speculates that one reason why it may be more difficult to clone monkeys and humans is because the egg cells are more fragile than those of other species. Human Cloning Moves a Step Closer 2013-05-15T19:16:27Z

Which means that it’s virtually impossible to clone in the only way that we know how to do – with the transfer of DNA from one individual into an egg cell. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z

First, a fertilized egg cell is zapped with a laser, making a hole in its membrane. Reproductive medicine: The power of three 2014-05-20T04:00:00Z

And the public needs to become more comfortable with the idea of swapping egg cells, something that may still be too much of a social and ethical hurdle for many. Scientists Discover New Technique To Prevent Certain Inherited Diseases 2013-01-03T21:05:21Z

Other forms of parthenogenesis occur when two egg cells fuse after meiosis. Slideshow: Virgin Birth Not So Miraculous in Animal Kingdom 2012-12-27T14:51:40Z

The team successfully performed the transfer on 25 egg cells in the course of their study. Nuclear Transfer Breakthrough Offers A Way To Prevent Mitochondrial Disorders 2012-12-19T18:12:41Z

This matters because the simplest cloning path would be to put Neanderthal DNA into a modern human egg cell. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z

While Turnbull and his team were developing their pronuclear-transfer technique in human egg cells, a US team was testing a related method in monkeys. Reproductive medicine: The power of three 2014-05-20T04:00:00Z

One aim is to rejuvenate egg cells from older women by adding fresh cytoplasm and mitochondria. Reproductive biology: Fertile mind 2012-11-14T18:21:14.237Z

In some parthenogenetic species, egg cells don’t undergo meiosis, the typical halving of the cell’s chromosomes, before dividing into new cells. Slideshow: Virgin Birth Not So Miraculous in Animal Kingdom 2012-12-27T14:51:40Z

Only about half of the manipulated egg cells developed normally after being fertilized, significantly fewer than with standard IVF techniques. Exchange of DNA Between Egg Cells May Help Prevent Mitochondrial Diseases 2012-10-24T22:01:56Z

If it can’t, then the mitochondria in the egg cell would also have to be replaced. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z

Turnbull and others have tested the techniques in mice, monkeys and human egg cells in culture; now, they say, it is time to try them in people. Reproductive medicine: The power of three 2014-05-20T04:00:00Z

The research builds on a controversial experimental fertility technique in which egg cells are injected with cytoplasm from another woman’s eggs. Reproductive biology: Fertile mind 2012-11-14T18:21:14.237Z

Gurdon overturned that dogma by removing the nucleus from a frog egg cell and replacing it with the nucleus from a tadpole’s intestinal cell. Cell rewind wins medicine Nobel 2012-10-10T17:21:04.837Z

Researchers remove the nuclear DNA—which accounts for the vast majority of the genetic information—from an unfertilized egg cell that carries mutant mitochondria. Exchange of DNA Between Egg Cells May Help Prevent Mitochondrial Diseases 2012-10-24T22:01:56Z

Gurdon took the DNA from a mature frog’s gut cell and inserted it into an egg cell. Stem Cell Scientists Awarded Nobel Prize in Physiology and Medicine 2012-10-09T20:50:57Z

How could a nucleus of an adult cell suddenly activate the transcriptional program of its embryonic past simply by being transplanted into an egg cell without a nucleus? The Prize in Biology in Memory of Alfred Nobel 2012-10-09T12:45:04.220Z

He transplanted the genetic material from an intestinal cell of one frog into the fertilized egg cell from another. Nobel Prize for medicine awarded to Gurdon, Yamanaka for stem cell discoveries 2012-10-08T12:43:00Z

Although it had already committed to specialization, inside the egg cell it acted like an egg’s nucleus and directed the development of a normal tadpole. Cell rewind wins medicine Nobel 2012-10-10T17:21:04.837Z

The egg cell was able to "reprogram" the DNA in the tadpole nucleus and the egg cell developed into a tadpole-the first cloned animal. Reprogrammed Cells Earn Nobel Honor 2012-10-08T17:00:00Z

In 1962, Dr. Gurdon did an audacious experiment in which he replaced the nucleus of a frog's egg cell with a nucleus from a mature, specialized cell derived from the intestine of a tadpole. Scientists Win Nobel For Stem-Cell Work 2012-10-08T12:30:00Z

Extracting the nucleus of an adult cell and then injecting it into a single egg cell required a lot of expertise and was not ready for a widespread use in stem cell laboratories. The Prize in Biology in Memory of Alfred Nobel 2012-10-09T12:45:04.220Z

In a classic experiment, he replaced the immature cell nucleus in an egg cell of a frog with the nucleus from a mature intestinal cell. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z

Prof Jeff Kerr, from Monash University, who worked on the study said: "This might ordinarily be cause for concern because you want damaged egg cells to die so as not to produce abnormal offspring." Cell death offers fertility clue 2012-09-22T02:46:14Z

Sperm cells divide every 15 days or so, whereas egg cells are relatively stable, and continual copying inevitably leads to errors, in DNA as in life. Father’s Age Is Linked to Risk of Autism and Schizophrenia 2012-08-22T17:18:06Z

For more than 50 years, the seemingly ironclad biological rule was that women and other female mammals produce a finite number of egg cells during their embryonic development, then shut down egg production for good. Stem Cell Study Scrambles Egg Debate, Again 2012-07-10T20:42:35Z

That is one hundred times larger than most bacteria and three times as large as a human egg cell, one of the largest cells in our bodies. Remarkable Creatures: ‘Nature’s Masons’ Do Double Duty as Earth’s Storytellers 2012-06-25T22:33:39Z

This modified egg cell developed into a normal tadpole. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z

The researchers from the Walter and Eliza Hall Institute, Monash University and Prince Henry's Institute of Medical Research looked at egg cells called primordial follicle oocytes, which provide each woman's lifetime supply of eggs. Cell death offers fertility clue 2012-09-22T02:46:14Z

They are then known as egg cells or ova. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z

The scientists plan to replace the nuclei of elephant egg cells with those of a mammoth, producing embryos with mammoth DNA. The Woolly Mammoth's Return? Scientists Plan to Clone Extinct Creature 2012-03-15T05:35:14Z

I’ve spent 35 years of my life studying egg cells and this is a cell that is at least as complicated as a neuron in the brain, if not more,” Albertini said. Ovarian Stem Cells Make Human Eggs in Possible Aid to Fertility 2012-02-27T15:49:12Z

Life – a journey towards increasing specialisation All of us developed from fertilized egg cells. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z

Even if the research is validated, the immediate use of the cells in question would be to generate egg cells for research use, like testing the effects of drugs. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z

“I’ve spent 35 years of my life studying egg cells and this is a cell that is at least as complicated as a neuron in the brain, if not more,” Albertini said in an interview. Ovarian Stem Cells Produce Eggs in Method That May Aid Fertility 2012-02-26T18:24:01Z

To solve this, West proposed 'therapeutic cloning' — taking the nucleus out of a patient's cell, transferring it into an egg cell to create a cloned embryo, then using that embryo to derive patient-matched stem-cell lines. Stem-cell research: Never say die 2012-01-11T18:20:33.987Z

Next, the researchers inserted the genes into frog egg cells, which then manufactured each protein and installed it in their plasma membrane. Octopuses Rewrite Their RNA to Beat the Cold 2012-01-05T19:10:00Z

In 1962, he tested this hypothesis by replacing the cell nucleus of a frog's egg cell with a nucleus from a mature, specialised cell derived from the intestine of a tadpole. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z

As with the mice, the team was able to retrieve reproductive cells that produced immature egg cells when grown in the laboratory. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z

It's a labor-intensive process that involves chemically isolating the proteins from the egg cells of pigs. The Elephant in the Room: How Contraception Could Save Future Elephants from Culling 2011-12-22T11:15:05.223Z

Both the monkey gene and the jellyfish gene were ferried into egg cells using a virus that does not cause disease. New AIDS Weapon: Cats That Glow in the Dark? 2011-09-12T20:07:07Z

So far as microscopical characters go, egg cells and spermatozoa are wonderfully alike in all the mammalia; in many cases we could not distinguish between those of different animals. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z

The mice not only went on to produce normal-looking sperm, but the sperm also successfully fertilized mouse egg cells in Petri dishes. Scientists Restore Fertility in Mice With Lab-Made Sperm 2011-08-06T05:19:39Z

Women are born with a complement of egg cells that must last throughout life. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z

The researchers injected the sperm into egg cells. Sperm grown in a test tube 2011-03-23T23:15:00.267Z

In the late 1970s, one of the most challenging puzzles in all of biology was that of embryonic development — how a complex creature formed from a single fertilized egg cell. Remarkable Creatures: For Whom the Cell Mutates: The Origins of Genetic Quirks 2011-03-14T23:08:10Z

Two years ago, Meeker’s team also showed that in women, PCBs can enter follicles, structures that hold egg cells. PCBs May Impair Fertility 2011-03-02T15:28:00Z

O' va ry, the organ in which the egg cells are developed. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z

The births were part of a "proof of principle" analysis on whether this method of screening of oocytes, or egg cells, and embryos before transfer in IVF can help to increase birth rates. First babies born in IVF full gene screening study 2010-10-15T13:24:00Z

He developed the technique - in which egg cells are removed from a woman, fertilized outside her body and then implanted into the womb - together with British gynecologist surgeon Patrick Steptoe, who died in 1988. In-vitro UK pioneer Edwards wins medicine Nobel 2010-10-04T12:03:00Z

He developed the technique, in which egg cells are fertilized outside the body and implanted in the womb, together with Patrick Steptoe, who died in 1988. Pioneer of In Vitro Fertilization Wins Nobel Prize 2010-10-04T10:11:00Z

The data would be more convincing, Carpenter says, if the authors could point to some mechanism by which PCBs might impair reproduction—such as changing the permeability of the outer membrane of egg cells. PCBs May Impair Fertility 2011-03-02T15:28:00Z

Sperm cells, the small, often motile, reproductive cell, which fuses with the egg cell. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z

The technique is also likely to be important in countries such as Germany where interfering with or freezing of embryos is banned but analysis of oocyte or egg cells is allowed. First babies born in IVF full gene screening study 2010-10-15T13:24:00Z

He developed the technique, in which egg cells are fertilized outside the body and ... Test-Tube Pioneer Wins Nobel Prize 2010-10-04T10:28:00Z

The protein is added to the chromosomes in egg cells when a baby girl is still in utero. Why It's Harder For Older Women to Have Healthy Babies 2010-09-22T14:20:00Z

They remove DNA from skin cells taken from the ear of a prized boar and transfer them into pig egg cells cleared of their nuclei. Technology helps China brace for population growth 2010-09-17T10:35:00Z

When she reaches puberty and starts to ovulate, 1,000 of those egg cells start to develop each month. A Key to Open Failed Egg Cells to Fertilization 2010-08-10T00:10:00Z

The most technologically advanced of assisted reproductive technologies, IVF involves removing an egg cell from a woman's body, fertilizing it in the lab, and placing it in the woman's womb. Fresh or frozen might not matter for donated eggs 2010-07-23T21:24:00Z

IVF, the most technologically advanced of assisted reproductive technologies, involves removing an egg cell from a woman's body, fertilizing it in the lab, and placing it in the woman's womb. Fertility treatment tied to risk of cerebral palsy 2010-07-02T21:23:00Z

In 1996, Scottish scientists made Dolly by transferring the nucleus from an adult sheep cell into a developing egg cell that had its nucleus removed. Animal Cloning: The Next Phase 2010-06-15T03:40:00Z

During reproduction in the all-female species, Ms. Lutes found, all 46 of the mother’s chromosomes are duplicated, resulting in 92 chromosomes in each egg cell. Observatory: Puzzle Solved: How a Fatherless Lizard Species Maintains Its Genetic Diversity 2010-02-22T21:10:00Z

If the trapped retrovirus happened to be in sperm or egg cells, its DNA might be passed down to the host’s descendants. 2010-01-12T05:27:00Z

Her head ached as she bounced Bennie, the child of Ben, of herself and of an unknown egg cell from an anonymous ovary, on her knees. The Real Hard Sell

The egg cell from the white parent carries the factor for white, the pollen cell from the red parent carries the factor for red. A Critique of the Theory of Evolution

The egg cell and the sperm cell fuse together. The Meaning of Evolution

Here we have the plant with its stamen and pistils, the egg cells and the pollen. Northern Nut Growers Association Report of the Proceedings at the Fifteenth Annual Meeting New York City, September 3, 4 and 5, 1924

E, the same after it has opened. o, the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

It was impossible, however, for Barry or any other person to follow the successive divisions of the egg cell through all the stages to the adult. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

Half of the egg cells are white bearing, half red bearing. A Critique of the Theory of Evolution

These little bodies, carried by the blood, were taken up by the egg cells or sperm cells, and the latter cells determined the future development. The Meaning of Evolution

When we turn to the starting point of human development, we find an egg cell and a spermatozoon, which unite and whose nuclei intermingle. Scientific American Supplement, No. 810, July 11, 1891

The fertilized egg cell becomes almost at once surrounded by a wall, which rapidly thickens, and forms a resting spore. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

Why the egg cell is unable to develop without such union with male cell does not concern us here, but its purpose will be evident as the description proceeds. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

In perhaps their simplest form these can be seen in egg cells. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86

We assume that numerous pollen grains fertilize numerous egg cells. Species and Varieties, Their Origin by Mutation

The ova, the female egg cells, are the fundamental concern of the ovary. The Glands Regulating Personality

Fig. 27.—H, the eight egg cells still surrounded by the inner membrane of the oögonium. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

Hence, if the number of chromosomes in the next generation is to be kept equal to that in the last generation, this egg cell must get rid of a part of its chromatin material. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

J, section of an open archegonium, × 300. o, the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

There is a large nucleus, but it is not always readily distinguished from the other contents of the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

Finally the pollen tube penetrates down to and through the open neck of the archegonium, until it comes in contact with the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

I, the egg cells escaping into the water. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

The descendants of individuals like the hunter may unite to form a city, and the descendants of the egg cell may, by combining, give rise to the starfish. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

This globular mass of protoplasm is the egg cell, or female cell, and the cell containing it is called the “oögonium.” Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

These are much smaller than the egg cell, and resemble the zoöspores in form, but are much smaller, and without chlorophyll. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

By careful observation the student may possibly be able to follow the spermatozoid into the oögonium, where it enters the egg cell at the clear spot on its surface. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

B, surface view, the others in optical section. o, egg cell, × 150. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

The results of such experiments are as yet rather conflicting, but it is evident enough from them that we can no longer look upon the egg cell as a simple undifferentiated cell. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

The act of fertilization may be easily observed by laying fresh antheridia into a drop of water containing recently discharged egg cells. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

Within a few minutes after putting the oögonia into water, the egg cells may be seen to escape into the water, when some of the antheridia may be added. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

J, a single egg cell surrounded by spermatozoids. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

I, a ripe archegonium in the act of opening, × 150. o, egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

It is clear, then, that we must look upon organization as something superior to cells and something existing within them, or at least within the egg cell, and controlling its development. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity

If a ripe archegonium is placed in water, it soon opens at the top, and the contents of the canal cells are forced out, leaving a clear channel down to the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

F, open apex of the same, × 150. o, egg cell. b, ventral canal cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

The first wall in the embryo is nearly at right angles to the axis of the archegonium and divides the egg cell into nearly equal parts. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

With a little patience, one or more may be seen to enter the open neck through which it forces itself, by a slow twisting movement, down to the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

The first divisions of the fertilized egg cell resemble those in the moss embryo, except that the first wall is parallel with the archegonium axis, instead of at right angles to it. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

The egg cell is very large, and appears of a yellowish color, and filled with large drops that give it a peculiar aspect. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses

单词	egg cell
例句	egg cell In the summer of 1902, working on grasshopper sperm and egg cells—which have particularly gigantic chromosomes—Sutton also postulated that genes were physically carried on chromosomes. The Gene 2016-06-02T00:00:00Z Weismann had proposed a radical alternative: perhaps hereditary information was contained exclusively in sperm and egg cells, with no direct mechanism for an acquired characteristic to be transmitted into sperm or eggs. The Gene 2016-06-02T00:00:00Z Cape buffalos are notoriously bad-tempered and dangerous animals and Vasti was sedated when her oocytes, or egg cells, were extracted using a technique similar to that used on human donors. South Africa unveils test-tube buffalo, plans IVF rhino 2016-09-23T04:00:00Z The technique was pioneered by the Cambridge physiologist Robert Edwards, working with obstetrician Patrick Steptoe of Oldham general hospital, who first reported successful fertilisation of a human egg cell in vitro in 1969. Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z The fertilisation of a human egg cell by a sperm was first observed under the microscope 99 years before Louise Brown was born, by the Swiss zoologist Hermann Fol. Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z In order for a plant to seed, its egg cells must be pollinated. Europe was not covered by dense forest before the arrival of modern humans 2023-11-14T05:00:00Z In the long term, they contain potential for finding new ways of treating infertility, or vice versa, of preventing the sperm from fertilising the egg cell. Membrane transporter ensures mobility of sperm cells 2023-10-26T04:00:00Z The Wolbachia rescue their host population through several strategies, including restoring fruit fly stem cells and ensuring that egg cells properly develop. Bacteria can enhance host insect's fertility with implications for disease control 2023-10-24T04:00:00Z The 100 or so organelles in sperm are swamped by hundreds of thousands of mitochondria embedded in each egg cell -- each carrying the 37 genes in mitochondrial DNA. Mature sperm lack intact mitochondrial DNA 2023-09-18T04:00:00Z But those offspring were made by tinkering with egg cells in laboratory dishes rather than by giving female animals the capacity for virgin birth, also known as parthenogenesis. ‘Virgin Birth’ Engineered into Female Animals for First Time 2023-08-01T04:00:00Z When doctors expressed concern about her fertility and the egg cells she could be jeopardizing by working so closely with radioactive material, Leona shrugged off their concern. What the Film Oppenheimer Probably Will Not Talk About: The Lost Women of the Manhattan Project 2023-07-20T04:00:00Z The sperm cells cannot reach and fertilise the egg cell. Membrane transporter ensures mobility of sperm cells 2023-10-26T04:00:00Z When parthenogenesis happens, the egg cell in the female's body divides enough times it needs in order to create half the genes required to procreate. Why a crocodile’s ‘virgin birth’ isn’t a miracle 2023-06-10T04:00:00Z It won’t necessarily be genetically identical to the mother though – this depends on how the egg cell develops. Crocodile’s ‘Virgin Birth’ Is a First for Science’s History Books 2023-06-09T04:00:00Z DNA is removed from a camel egg cell and replaced with DNA from a frozen body cell of a camel prized for some quality such as speed or beauty. Dubai camel cloning caters to races, beauty pageants 2023-05-25T04:00:00Z Male gametes reach female gametophyte and the egg cell gamete though a pollen tube: an extension of a cell within the pollen grain. Fundamentals of Biology 2015-01-01T00:00:00Z In reproductive cloning, a donor nucleus is put into an enucleated egg cell, which is then stimulated to divide and develop into an organism. Concepts of Biology 2013-04-25T00:00:00Z Meanwhile, other groups were figuring out how to coax egg cells to develop into embryos without being fertilized. ‘Game changer.’ Scientists are genetically engineering crops to clone themselves 2023-05-17T04:00:00Z Then, through a process that involved growing them and treating them with a drug, they converted male mouse stem cells into female cells and produced functional egg cells. For 1st time, scientists create mice with cells from 2 males 2023-03-15T04:00:00Z Previously egg cell creation began with stem cells from a female animal. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z The mature embryo sac contains one egg cell, two synergids or “helper” cells, three antipodal cells, and two polar nuclei in a central cell. Fundamentals of Biology 2015-01-01T00:00:00Z The approach to producing an artificially cloned individual is to take the egg cell of one individual and to remove the haploid nucleus. Concepts of Biology 2013-04-25T00:00:00Z The edited genome would then be implanted into an egg cell of that related species to develop. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z Next the team tested the device within a living system: the egg cell of the African clawed frog, a model organism. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z In the ovary, the manipulated cell developed into an egg cell, or oocyte. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z At fertilization, one of the sperm cells will finally unite its haploid nucleus with the haploid nucleus of a haploid egg cell. Fundamentals of Biology 2015-01-01T00:00:00Z Then a diploid nucleus from a body cell of a second individual, the donor, is put into the egg cell. Concepts of Biology 2013-04-25T00:00:00Z Cloning requires access to an egg cell that is ready for fertilization but not yet fertilized. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z After these insertions, the egg cells looked healthy under a microscope and had not sprung any leaks. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z Telfer is particularly concerned by how few of the artificial egg cells grew into living mice. Mice with Two Fathers? Researchers Develop Egg Cells from Male Mice 2023-03-15T04:00:00Z The egg cell and two other cells called synergids are at the micropylar end. Fundamentals of Biology 2015-01-01T00:00:00Z In the procedure, the DNA from an adult human is introduced into a human egg cell, which is then stimulated to divide. Concepts of Biology 2013-04-25T00:00:00Z “There is no access to a bird egg cell at the same developmental time as there is for a mammal,” he explains. A 'De-Extinction' Company Wants to Bring Back the Dodo 2023-01-31T05:00:00Z While inside the egg cell, the Cell Rover was able to receive an electromagnetic transmission and send a responding signal outward, up to a distance of one centimeter. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z Safeguarding the placenta would be particularly important, as retroviruses that infected an embryo early enough in development could get into sperm and egg cells. Ancient virus may be protecting the human placenta 2022-10-27T04:00:00Z However, early embryonic development requires the cytoplasmic material contained in the egg cell. Biology for AP Courses 2022-06-09T00:00:00Z One of the sperm cells will finally unite its haploid nucleus with the haploid nucleus of an egg cell in the process of fertilization. Concepts of Biology 2013-04-25T00:00:00Z In many marine organisms, males and females release their sperm and egg cells to mix in the water. Is this pillbug-like organism a pollinator of the sea? 2022-07-27T04:00:00Z The male gametes are usually called sperm, and the female gametes are called egg cells. Miller & Levine Biology 2018-01-01T00:00:00Z The fertilized egg cell, or zygote, starts dividing to generate the cells that make up an entire organism. Anatomy and Physiology 2013-06-19T00:00:00Z Fusion of the gametes gives rise to a fertilized egg cell, or zygote. Biology for AP Courses 2022-06-09T00:00:00Z A human egg cell can reach about 120 microns in diameter, or five one-thousandths of an inch. You Don’t Need a Microscope to See the Biggest Bacteria Ever Found 2022-06-23T04:00:00Z In the case of Gracilaria, however, things are more complicated: The female alga doesn’t release its egg cells, but keeps them inside funnel-shaped filaments. Is this pillbug-like organism a pollinator of the sea? 2022-07-27T04:00:00Z Maternal inheritance occurs because chloroplasts and mitochondria are inherited from the maternal gamete, or egg cell. Miller & Levine Biology 2018-01-01T00:00:00Z You developed from a single fertilized egg cell into the complex organism containing trillions of cells that you see when you look in a mirror. Anatomy and Physiology 2013-06-19T00:00:00Z Fusing a ferret fibroblast with an egg cell made an embryo, and a clone - Elizabeth Ann the black-footed ferret - was born in December of 2020. Extinction: Why scientists are freezing threatened species in 'biobanks' 2022-05-19T04:00:00Z A common procedure for families who have trouble conceiving, IVF involves fertilizing a human egg cell outside of the human body, then re-implanting it in one's uterus and carrying it to term. How abortion "trigger laws" could inadvertently impede fertility treatments 2022-05-10T04:00:00Z In this cloning technology, technicians replace the nucleus of an egg cell with a nucleus taken from a body cell. In a conservation first, a cloned ferret could help save her species 2022-01-13T05:00:00Z Each gametophyte produces reproductive cells called gametes, also known as sperm and egg cells. Miller & Levine Biology 2018-01-01T00:00:00Z Beating cilia on cells in the female fallopian tubes move egg cells from the ovary towards the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z "The team has reached the decision to retire the older of the two remaining females, 32-year-old Najin, as a donor of egg cells," Biorescue said in a statement, citing ethical considerations. One of world's last two northern white rhinos dropped from race to save the species 2021-10-21T04:00:00Z This DNA is passed from mother to child in the egg cell. 'I was found wrapped in my mum's coat - but who am I?' 2020-07-18T04:00:00Z This method is faster than those that involve altering sperm or egg cells. From Hamsters to Baboons: The Animals Helping Scientists Understand the Coronavirus 2020-05-14T04:00:00Z When mature, each gametophyte contains a few large egg cells, which can be fertilized by sperm. Miller & Levine Biology 2018-01-01T00:00:00Z The only flagellated cell in humans is the sperm cell that must propel itself towards female egg cells. Anatomy and Physiology 2013-06-19T00:00:00Z Scientists hope to implant embryos made from the rhinos' egg cells and frozen sperm from deceased males into surrogate mothers. One of world's last two northern white rhinos dropped from race to save the species 2021-10-21T04:00:00Z Together with the nuclear-transfer studies, these pivotal experiments established that factors produced in egg cells and differentiated cells are able to direct cell fate by regulating gene expression. Cell identity reprogrammed 2019-10-13T04:00:00Z Sarah also talks with Jennifer Gruhn, a postdoctoral research fellow at the University of Copenhagen Center for Chromosome Stability, about counting chromosomes in human egg cells. Privacy concerns slow Facebook studies, and how human fertility depends on chromosome counts 2019-09-26T04:00:00Z Mitochondria provide a cell with energy; in bears as in humans, mitochondria and their DNA are inherited only from mom through the egg cell. Humans pushed cave bears to extinction, their DNA suggests 2019-08-15T04:00:00Z Another major project, made possible because of the worm’s transparency, was to track the lineage of all 959 cells in the adult worm’s body, starting from the single egg cell. Sydney Brenner, a Decipherer of the Genetic Code, Is Dead at 92 2019-04-05T04:00:00Z The researchers in Hunt’s lab were studying this process when suddenly the egg cells of their mice--including the ones that were supposed to be normal--started showing major genetic abnormalities. What a strange case of scientific déjà vu showed us about the dangers of plastics 2019-03-18T04:00:00Z In the authors’ experiments, donor nuclei from cells at various developmental stages, from early blastomeres to cells from tadpoles just before hatching, were transferred into Xenopus egg cells. Cell identity reprogrammed 2019-10-13T04:00:00Z But no one can explain exactly how, say, changes in brain cells caused by abuse could be communicated to fully formed sperm or egg cells before conception. Can We Really Inherit Trauma? 2018-12-10T05:00:00Z Then she exposed immature frog egg cells—a common model in cell physiology—to the venom and measured ion movement using electrophysiological techniques. Jellyfish almost killed this scientist. Now, she wants to save others from their fatal venom 2018-11-08T05:00:00Z Scientists in Japan made progress recently in the quest to combat infertility, creating the precursor to a human egg cell in a dish from nothing but a woman’s blood cells. The 'game-changing’ technique to create babies from skin cells just stepped forward 2018-09-20T04:00:00Z The stem cells will be turned into germ cells — sperm and egg cells. Second rhino pregnancy signals hope for nearly extinct subspecies 2018-09-18T04:00:00Z At the time, dogs from Korean meat farms were used, for egg cells and as surrogates, and returned to the farms they came from to be raised and sold as meat. What a dog-cloning expert would have told Barbra Streisand: ‘Nooooooo!’ 2018-03-07T05:00:00Z The Amazon molly’s egg cells are activated to develop into an embryo by a sperm cell that degenerates without fusing with the egg’s nucleus. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z For Ross, the most exciting application depends on his team now figuring out how to develop these ES cells into cattle sperm and egg cells. First cow embryonic stem cells could lead to healthier, more productive livestock 2018-02-05T05:00:00Z This involves transferring DNA from the nucleus of a cell to a donated egg cell that is then prompted to develop into an embryo. First monkey clones created in the lab 2018-01-24T05:00:00Z Some of them became “primordial germ cells,” precursors of both sperm and egg cells. Second rhino pregnancy signals hope for nearly extinct subspecies 2018-09-18T04:00:00Z Still, while it would be easy to inject the DNA into an egg cell in a lab, it’s a little hard to imagine that transfer happening in nature. The Grinch’s cardiologist, and other researchers make sense of Christmas tales 2017-12-24T05:00:00Z The fish reproduces using a strategy in which a female’s egg cell develops into a baby without being fertilized by a male’s sperm cell. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z Still, while it would be easy to inject the DNA into an egg cell in a lab, it’s a little hard to imagine that transfer happening in nature. The Grinch needs a good cardiologist, and other holiday stories explained by scientists 2017-12-22T05:00:00Z Sperm divide more often than egg cells do. The link between autism and older parents is clear, but the why is not 2017-12-15T05:00:00Z In the United Kingdom and Hungary, neonic compounds seemed to reduce worker-bee numbers in honeybee hives; in Hungary, researchers also saw fewer egg cells in these hives, an indication of reduced reproductive success. The bitter battle over the world’s most popular insecticides 2017-11-07T05:00:00Z One way is how Dolly the sheep was cloned, by taking the part of the egg cell that contains genetic information and replacing it with a donor’s cell nucleus. Orphan Black is ending, but how far has human cloning come? 2017-08-11T04:00:00Z The fish reproduces using a strategy in which a female’s egg cell develops into a baby without being fertilized by a male’s sperm cell. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z The bulk of the mother’s genome is tangled in the egg’s nucleus, but separate strands of DNA floating in the egg cell build the body’s energy generators, the mitochondria. The 'three-parent baby' fertility doctor needs to stop marketing the procedure, FDA says 2017-08-05T04:00:00Z The number of de novo mutations in egg cells increases with age, although to a lesser degree than it does in sperm. The link between autism and older parents is clear, but the why is not 2017-12-15T05:00:00Z In Germany, however, the honeybee hives exposed to neonics had more egg cells — a puzzling result. The bitter battle over the world’s most popular insecticides 2017-11-07T05:00:00Z In these embryos, the sperm cell’s mutant gene ignored that template and instead copied the healthy DNA sequence from the egg cell. In Breakthrough, Scientists Edit a Dangerous Mutation From Genes in Human Embryos 2017-08-02T04:00:00Z The Amazon molly’s egg cells are activated to develop into an embryo by a sperm cell that degenerates without fusing with the egg’s nucleus. Girl power: life's going swimmingly for all-female fish species 2018-02-12T05:00:00Z These changes would also survive into that individual’s sperm or egg cells and would be passed on to future generations as well. Researchers Use Gene Editing in Human Embryos to Fix Disease 2017-07-27T04:00:00Z They arise when viruses integrate into the genome of sperm or egg cells, and thus get passed down from one generation to the next. Medicine's Movable Feast: What Jumping Genes Can Teach Us about Treating Disease 2017-07-26T04:00:00Z Its sperm and egg cells will thus bear two copies of the new gene, which radically increases the odds that its offspring will inherit it. How will we keep controversial gene drive technology in check? 2017-07-19T04:00:00Z The process begins when a gene for a molecule with a potentially toxic function, like a protein-chopping enzyme, is accidentally duplicated, typically during the formation of egg cells and sperm. Moonlighting Genes Evolve for a Venomous Job 2017-07-10T04:00:00Z The procedure, called mitochondrial replacement therapy, allows researchers to replace the faulty mitochondria in a woman’s egg cells with those from a healthy donor. United Kingdom moves forward with controversial embryo technique 2017-03-16T04:00:00Z Giving new meaning to the term “test-tube babies,” this year, researchers in Japan produced mouse pups from egg cells grown entirely in a lab dish. From AI to protein folding: Our breakthrough runners-up 2016-12-22T05:00:00Z Mitochondria are the little powerhouses in the cytoplasm, the liquid part of the egg cell outside the nucleus. The kids are all right: Children with 3-way DNA are healthy 2016-10-26T04:00:00Z The researchers transplanted the nucleus of one of the woman’s egg cells into a donor egg, leaving the donor’s healthy mitochondria intact. Reports of 'three-parent babies' multiply 2016-10-18T04:00:00Z The method involves removing the nucleus—the bulk of a cell’s DNA—from one of the mother’s egg cells, and inserting that nucleus into a donor egg cell stripped of its own nucleus. Unanswered questions surround baby born to three parents 2016-09-27T04:00:00Z In the procedure, Perry's team used chemicals to manipulate an unfertilized egg cell into becoming something different -- a "fake" embryo. Health Highlights: Sept. 14, 2016 2016-09-14T04:00:00Z In 2012, the same researchers took the first key step: They made fertile egg cells from stem cells. From AI to protein folding: Our breakthrough runners-up 2016-12-22T05:00:00Z For better or worse, egg cells are still irreplaceable. ‘Motherless babies!’ How to create a tabloid science headline in five easy steps 2016-09-14T04:00:00Z The team of researchers proposed the futuristic scenario after producing a litter of healthy mice with a technique that bypasses the normal step of fertilising an egg cell with sperm. Skin cells might be used instead of eggs to make embryos, scientists say 2016-09-13T04:00:00Z In the early 2000s, Chinese investigators transferred3 the nuclei of human skin cells to cultured rabbit egg cells in an attempt to produce humanized stem cells. Bioethics in China: No wild east 2016-06-21T04:00:00Z But in their latest study, they triggered unfertilized human egg cells to divide. Scientists Say They've Created New Type of Stem Cells 2016-03-16T04:00:00Z And although previous work has suggested that sperm cells can carry 'epigenetic' factors, this is the first time that such an effect has been observed with egg cells. High-fat diets raise risk of obesity in offspring 2016-03-13T05:00:00Z In addition, the egg cell contains powerful, as yet unknown factors that enable it to direct the first steps of embryo development. ‘Motherless babies!’ How to create a tabloid science headline in five easy steps 2016-09-14T04:00:00Z By using those to fertilize egg cells from other mice, the research team was able to prove their viability. Researchers made sperm-like cells and used them to create new mice 2016-02-25T05:00:00Z Then they injected these spermlike cells into mouse egg cells and transferred the embryos into female mice. In Mice, Scientists Turn Stem Cells Into Sperm 2016-02-25T05:00:00Z Other efforts to generate embryonic stem cells using just human egg cells did not work, the researchers noted. Scientists Say They've Created New Type of Stem Cells 2016-03-16T04:00:00Z One is that it occurs through chemical modifications of DNA called methylations, and another is that short RNA chains called microRNAs are inherited in the sperm or egg cell along with the DNA. High-fat diets raise risk of obesity in offspring 2016-03-13T05:00:00Z At least some males at every site had female egg cells. Why Are These Males Growing Eggs? He first used sophisticated microscopes to examine extracts from frog egg cells, quantifying microtubule density, orientation and stresses during spindle formation. The physics of life 2016-01-04T05:00:00Z The research team used mouse embryonic stem cells and turned them into spermlike cells that were injected into egg cells to create embryos. In Mice, Scientists Turn Stem Cells Into Sperm 2016-02-25T05:00:00Z Larger-scale breeding operations are more likely to use in vitro techniques: inseminating many egg cells from a given cow in a Petri dish, creating dozens of embryos instead of a handful. Holy cow! A farmer tries to make a better calf through genomic analysis. 2015-11-30T05:00:00Z “The treatments are to do with developing egg cell treatments to help the IVF procedure … Does anyone else have any information?” Feature: A controversial company offers a new way to make a baby 2015-11-05T05:00:00Z The older donors were given higher doses of hormonal drugs and produced fewer egg cells. Good Results From IVF Egg Donors Over Age 35 2015-10-20T04:00:00Z A. The development of offspring from unfertilized egg cells is called parthenogenesis. A Mother’s Ability to Reproduce All by Herself 2015-10-19T04:00:00Z The original DNA molecule present in a fertilised egg cell is copied and recopied trillions of times over the course of an organism’s life. Wisdom, ancient and modern 2015-10-07T04:00:00Z This shuffling occurs when egg cells are first being created. Flies that fight off parasites produce offspring with greater genetic mix 2015-08-12T04:00:00Z Experts believe the heightened risk of autism among older parents might be linked to genetic mutations in the sperm or egg cells. Study: Parents' Ages Linked to Autism Risk 2015-06-17T04:00:00Z The one that eventually becomes the egg cell retains key cellular structures and the gel-like cytoplasm. Scientists document Florida 'virgin births' of endangered sawfish 2015-06-01T04:00:00Z “What are the consequences” of adding mitochondria to an egg cell? he asks. Controversial fertility treatments focus on eggs’ power plants 2015-03-30T04:00:00Z These are normally created naturally when an egg cell divides after it is fertilised by a sperm. Biological Babies For Same-Sex Parents a Possibility After Stem Cell Breakthrough 2015-02-25T05:00:00Z Mitochondria are passed on through the egg cell, so the diseases are inherited through the mother. Mitochondrial gene therapy passes final U.K. vote 2015-02-24T05:00:00Z Researchers can harvest thousands of egg cells from mice without difficulty. Can scientists bring mammoths back to life? 2015-02-06T05:00:00Z In making an egg cell, a precursor cell divides into four cells. Scientists document Florida 'virgin births' of endangered sawfish 2015-06-01T04:00:00Z A somatic cell, which isn’t from a sperm cell or egg cell, contains the complete DNA of the animal. Appeals court: Quarter horse group may reject clones 2015-01-14T05:00:00Z But the mother also provides the rest of the egg cell, including membranes and organelles and enzymes and, crucially, energy generating units called mitochondria that have their own genetic material, completely independent of the father. Female Vikings? That's Just 'Vrøvl' 2014-12-08T05:00:00Z Rather, these mutations arose during the creation of a father’s sperm cell or mother’s egg cell, they found. Autism linked to dozens of genetic mutations in major new studies This prevents egg cells from reaching the uterus. Trying to limit the number of deer, with surprising results These cancers arise from stray sperm or egg cells that travel to other parts of the body and become cancerous tumors. Kidney and Thyroid Cancer Rates Up Among U.S. Children, Study Finds 2014-09-08T04:00:00Z But some aspects of these observations aren’t altogether novel, given that there are other animal species where sperm cells move through the body cavity before fertilizing egg cells. Scientists discover 'killer' roundworm sperm 2014-07-29T04:00:00Z In the study, 72 percent of nearly 3,000 mouse egg cells survived. How to Get New Genes Into a Cell 2014-06-26T04:00:00Z In the 1980s, embryologists working with mice had begun using 'pronuclear transfer' techniques to investigate the developmental role of egg cells' cytoplasm. Reproductive medicine: The power of three 2014-05-20T04:00:00Z Fertilization takes place when an egg cell and a sperm cell recognize one another and fuse to form an embryo. Oh baby: Scientists find protein that lets egg and sperm hook up 2014-04-16T18:48:19Z The particular piece of DNA we were looking at was part of the mitochondrial genome—mtDNA, for short—that is transmitted in the egg cells of all mothers to their children. The Hunt for Neandertal Genes [Excerpt] 2014-02-22T12:00:00Z The FDA regulates blood, cartilage, bone, skin and egg cells as human tissues or under similar customized statutes. Policy: How to regulate faecal transplants 2014-02-19T18:50:53.475Z What's most important is whether the ES cells' mitochondrial DNA matches that of the egg cell donor and whether the nuclear DNA matches the cell that was cloned. Mislabeled Images Bedevil Landmark Cloning Paper 2013-05-23T23:40:00Z Human egg cells are one-tenth of a millimetre wide, and pronuclear transfers must be done under a microscope, in a specially designed chamber that controls temperature and air flow. Reproductive medicine: The power of three 2014-05-20T04:00:00Z The females of these mice were infertile because their egg cells did not fuse with sperm. Oh baby: Scientists find protein that lets egg and sperm hook up 2014-04-16T18:48:19Z Mitapilov and his team took donated egg cells and swapped their nuclei for the nuclei of cells from fetal tissue. Viable Human Embryonic Stem Cells Created By Cloning 2013-05-17T12:47:40Z He speculates that one reason why it may be more difficult to clone monkeys and humans is because the egg cells are more fragile than those of other species. Human Cloning Moves a Step Closer 2013-05-15T19:16:27Z Which means that it’s virtually impossible to clone in the only way that we know how to do – with the transfer of DNA from one individual into an egg cell. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z First, a fertilized egg cell is zapped with a laser, making a hole in its membrane. Reproductive medicine: The power of three 2014-05-20T04:00:00Z And the public needs to become more comfortable with the idea of swapping egg cells, something that may still be too much of a social and ethical hurdle for many. Scientists Discover New Technique To Prevent Certain Inherited Diseases 2013-01-03T21:05:21Z Other forms of parthenogenesis occur when two egg cells fuse after meiosis. Slideshow: Virgin Birth Not So Miraculous in Animal Kingdom 2012-12-27T14:51:40Z The team successfully performed the transfer on 25 egg cells in the course of their study. Nuclear Transfer Breakthrough Offers A Way To Prevent Mitochondrial Disorders 2012-12-19T18:12:41Z This matters because the simplest cloning path would be to put Neanderthal DNA into a modern human egg cell. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z While Turnbull and his team were developing their pronuclear-transfer technique in human egg cells, a US team was testing a related method in monkeys. Reproductive medicine: The power of three 2014-05-20T04:00:00Z One aim is to rejuvenate egg cells from older women by adding fresh cytoplasm and mitochondria. Reproductive biology: Fertile mind 2012-11-14T18:21:14.237Z In some parthenogenetic species, egg cells don’t undergo meiosis, the typical halving of the cell’s chromosomes, before dividing into new cells. Slideshow: Virgin Birth Not So Miraculous in Animal Kingdom 2012-12-27T14:51:40Z Only about half of the manipulated egg cells developed normally after being fertilized, significantly fewer than with standard IVF techniques. Exchange of DNA Between Egg Cells May Help Prevent Mitochondrial Diseases 2012-10-24T22:01:56Z If it can’t, then the mitochondria in the egg cell would also have to be replaced. Is It Possible To Clone A Neanderthal? 2013-01-20T16:19:07Z Turnbull and others have tested the techniques in mice, monkeys and human egg cells in culture; now, they say, it is time to try them in people. Reproductive medicine: The power of three 2014-05-20T04:00:00Z The research builds on a controversial experimental fertility technique in which egg cells are injected with cytoplasm from another woman’s eggs. Reproductive biology: Fertile mind 2012-11-14T18:21:14.237Z Gurdon overturned that dogma by removing the nucleus from a frog egg cell and replacing it with the nucleus from a tadpole’s intestinal cell. Cell rewind wins medicine Nobel 2012-10-10T17:21:04.837Z Researchers remove the nuclear DNA—which accounts for the vast majority of the genetic information—from an unfertilized egg cell that carries mutant mitochondria. Exchange of DNA Between Egg Cells May Help Prevent Mitochondrial Diseases 2012-10-24T22:01:56Z Gurdon took the DNA from a mature frog’s gut cell and inserted it into an egg cell. Stem Cell Scientists Awarded Nobel Prize in Physiology and Medicine 2012-10-09T20:50:57Z How could a nucleus of an adult cell suddenly activate the transcriptional program of its embryonic past simply by being transplanted into an egg cell without a nucleus? The Prize in Biology in Memory of Alfred Nobel 2012-10-09T12:45:04.220Z He transplanted the genetic material from an intestinal cell of one frog into the fertilized egg cell from another. Nobel Prize for medicine awarded to Gurdon, Yamanaka for stem cell discoveries 2012-10-08T12:43:00Z Although it had already committed to specialization, inside the egg cell it acted like an egg’s nucleus and directed the development of a normal tadpole. Cell rewind wins medicine Nobel 2012-10-10T17:21:04.837Z The egg cell was able to "reprogram" the DNA in the tadpole nucleus and the egg cell developed into a tadpole-the first cloned animal. Reprogrammed Cells Earn Nobel Honor 2012-10-08T17:00:00Z In 1962, Dr. Gurdon did an audacious experiment in which he replaced the nucleus of a frog's egg cell with a nucleus from a mature, specialized cell derived from the intestine of a tadpole. Scientists Win Nobel For Stem-Cell Work 2012-10-08T12:30:00Z Extracting the nucleus of an adult cell and then injecting it into a single egg cell required a lot of expertise and was not ready for a widespread use in stem cell laboratories. The Prize in Biology in Memory of Alfred Nobel 2012-10-09T12:45:04.220Z In a classic experiment, he replaced the immature cell nucleus in an egg cell of a frog with the nucleus from a mature intestinal cell. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z Prof Jeff Kerr, from Monash University, who worked on the study said: "This might ordinarily be cause for concern because you want damaged egg cells to die so as not to produce abnormal offspring." Cell death offers fertility clue 2012-09-22T02:46:14Z Sperm cells divide every 15 days or so, whereas egg cells are relatively stable, and continual copying inevitably leads to errors, in DNA as in life. Father’s Age Is Linked to Risk of Autism and Schizophrenia 2012-08-22T17:18:06Z For more than 50 years, the seemingly ironclad biological rule was that women and other female mammals produce a finite number of egg cells during their embryonic development, then shut down egg production for good. Stem Cell Study Scrambles Egg Debate, Again 2012-07-10T20:42:35Z That is one hundred times larger than most bacteria and three times as large as a human egg cell, one of the largest cells in our bodies. Remarkable Creatures: ‘Nature’s Masons’ Do Double Duty as Earth’s Storytellers 2012-06-25T22:33:39Z This modified egg cell developed into a normal tadpole. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z The researchers from the Walter and Eliza Hall Institute, Monash University and Prince Henry's Institute of Medical Research looked at egg cells called primordial follicle oocytes, which provide each woman's lifetime supply of eggs. Cell death offers fertility clue 2012-09-22T02:46:14Z They are then known as egg cells or ova. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The scientists plan to replace the nuclei of elephant egg cells with those of a mammoth, producing embryos with mammoth DNA. The Woolly Mammoth's Return? Scientists Plan to Clone Extinct Creature 2012-03-15T05:35:14Z I’ve spent 35 years of my life studying egg cells and this is a cell that is at least as complicated as a neuron in the brain, if not more,” Albertini said. Ovarian Stem Cells Make Human Eggs in Possible Aid to Fertility 2012-02-27T15:49:12Z Life – a journey towards increasing specialisation All of us developed from fertilized egg cells. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z Even if the research is validated, the immediate use of the cells in question would be to generate egg cells for research use, like testing the effects of drugs. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z “I’ve spent 35 years of my life studying egg cells and this is a cell that is at least as complicated as a neuron in the brain, if not more,” Albertini said in an interview. Ovarian Stem Cells Produce Eggs in Method That May Aid Fertility 2012-02-26T18:24:01Z To solve this, West proposed 'therapeutic cloning' — taking the nucleus out of a patient's cell, transferring it into an egg cell to create a cloned embryo, then using that embryo to derive patient-matched stem-cell lines. Stem-cell research: Never say die 2012-01-11T18:20:33.987Z Next, the researchers inserted the genes into frog egg cells, which then manufactured each protein and installed it in their plasma membrane. Octopuses Rewrite Their RNA to Beat the Cold 2012-01-05T19:10:00Z In 1962, he tested this hypothesis by replacing the cell nucleus of a frog's egg cell with a nucleus from a mature, specialised cell derived from the intestine of a tadpole. The 2012 Nobel Prize in Physiology or Medicine 2012-10-08T11:45:05.853Z As with the mice, the team was able to retrieve reproductive cells that produced immature egg cells when grown in the laboratory. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z It's a labor-intensive process that involves chemically isolating the proteins from the egg cells of pigs. The Elephant in the Room: How Contraception Could Save Future Elephants from Culling 2011-12-22T11:15:05.223Z Both the monkey gene and the jellyfish gene were ferried into egg cells using a virus that does not cause disease. New AIDS Weapon: Cats That Glow in the Dark? 2011-09-12T20:07:07Z So far as microscopical characters go, egg cells and spermatozoa are wonderfully alike in all the mammalia; in many cases we could not distinguish between those of different animals. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z The mice not only went on to produce normal-looking sperm, but the sperm also successfully fertilized mouse egg cells in Petri dishes. Scientists Restore Fertility in Mice With Lab-Made Sperm 2011-08-06T05:19:39Z Women are born with a complement of egg cells that must last throughout life. Scientists Use Stem Cells to Generate Human Eggs 2012-02-27T00:30:27Z The researchers injected the sperm into egg cells. Sperm grown in a test tube 2011-03-23T23:15:00.267Z In the late 1970s, one of the most challenging puzzles in all of biology was that of embryonic development — how a complex creature formed from a single fertilized egg cell. Remarkable Creatures: For Whom the Cell Mutates: The Origins of Genetic Quirks 2011-03-14T23:08:10Z Two years ago, Meeker’s team also showed that in women, PCBs can enter follicles, structures that hold egg cells. PCBs May Impair Fertility 2011-03-02T15:28:00Z O' va ry, the organ in which the egg cells are developed. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z The births were part of a "proof of principle" analysis on whether this method of screening of oocytes, or egg cells, and embryos before transfer in IVF can help to increase birth rates. First babies born in IVF full gene screening study 2010-10-15T13:24:00Z He developed the technique - in which egg cells are removed from a woman, fertilized outside her body and then implanted into the womb - together with British gynecologist surgeon Patrick Steptoe, who died in 1988. In-vitro UK pioneer Edwards wins medicine Nobel 2010-10-04T12:03:00Z He developed the technique, in which egg cells are fertilized outside the body and implanted in the womb, together with Patrick Steptoe, who died in 1988. Pioneer of In Vitro Fertilization Wins Nobel Prize 2010-10-04T10:11:00Z The data would be more convincing, Carpenter says, if the authors could point to some mechanism by which PCBs might impair reproduction—such as changing the permeability of the outer membrane of egg cells. PCBs May Impair Fertility 2011-03-02T15:28:00Z Sperm cells, the small, often motile, reproductive cell, which fuses with the egg cell. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z The technique is also likely to be important in countries such as Germany where interfering with or freezing of embryos is banned but analysis of oocyte or egg cells is allowed. First babies born in IVF full gene screening study 2010-10-15T13:24:00Z He developed the technique, in which egg cells are fertilized outside the body and ... Test-Tube Pioneer Wins Nobel Prize 2010-10-04T10:28:00Z The protein is added to the chromosomes in egg cells when a baby girl is still in utero. Why It's Harder For Older Women to Have Healthy Babies 2010-09-22T14:20:00Z They remove DNA from skin cells taken from the ear of a prized boar and transfer them into pig egg cells cleared of their nuclei. Technology helps China brace for population growth 2010-09-17T10:35:00Z When she reaches puberty and starts to ovulate, 1,000 of those egg cells start to develop each month. A Key to Open Failed Egg Cells to Fertilization 2010-08-10T00:10:00Z The most technologically advanced of assisted reproductive technologies, IVF involves removing an egg cell from a woman's body, fertilizing it in the lab, and placing it in the woman's womb. Fresh or frozen might not matter for donated eggs 2010-07-23T21:24:00Z IVF, the most technologically advanced of assisted reproductive technologies, involves removing an egg cell from a woman's body, fertilizing it in the lab, and placing it in the woman's womb. Fertility treatment tied to risk of cerebral palsy 2010-07-02T21:23:00Z In 1996, Scottish scientists made Dolly by transferring the nucleus from an adult sheep cell into a developing egg cell that had its nucleus removed. Animal Cloning: The Next Phase 2010-06-15T03:40:00Z During reproduction in the all-female species, Ms. Lutes found, all 46 of the mother’s chromosomes are duplicated, resulting in 92 chromosomes in each egg cell. Observatory: Puzzle Solved: How a Fatherless Lizard Species Maintains Its Genetic Diversity 2010-02-22T21:10:00Z If the trapped retrovirus happened to be in sperm or egg cells, its DNA might be passed down to the host’s descendants. 2010-01-12T05:27:00Z Her head ached as she bounced Bennie, the child of Ben, of herself and of an unknown egg cell from an anonymous ovary, on her knees. The Real Hard Sell The egg cell from the white parent carries the factor for white, the pollen cell from the red parent carries the factor for red. A Critique of the Theory of Evolution The egg cell and the sperm cell fuse together. The Meaning of Evolution Here we have the plant with its stamen and pistils, the egg cells and the pollen. Northern Nut Growers Association Report of the Proceedings at the Fifteenth Annual Meeting New York City, September 3, 4 and 5, 1924 E, the same after it has opened. o, the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses It was impossible, however, for Barry or any other person to follow the successive divisions of the egg cell through all the stages to the adult. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity Half of the egg cells are white bearing, half red bearing. A Critique of the Theory of Evolution These little bodies, carried by the blood, were taken up by the egg cells or sperm cells, and the latter cells determined the future development. The Meaning of Evolution When we turn to the starting point of human development, we find an egg cell and a spermatozoon, which unite and whose nuclei intermingle. Scientific American Supplement, No. 810, July 11, 1891 The fertilized egg cell becomes almost at once surrounded by a wall, which rapidly thickens, and forms a resting spore. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Why the egg cell is unable to develop without such union with male cell does not concern us here, but its purpose will be evident as the description proceeds. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity In perhaps their simplest form these can be seen in egg cells. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 We assume that numerous pollen grains fertilize numerous egg cells. Species and Varieties, Their Origin by Mutation The ova, the female egg cells, are the fundamental concern of the ovary. The Glands Regulating Personality Fig. 27.—H, the eight egg cells still surrounded by the inner membrane of the oögonium. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Hence, if the number of chromosomes in the next generation is to be kept equal to that in the last generation, this egg cell must get rid of a part of its chromatin material. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity J, section of an open archegonium, × 300. o, the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses There is a large nucleus, but it is not always readily distinguished from the other contents of the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Finally the pollen tube penetrates down to and through the open neck of the archegonium, until it comes in contact with the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses I, the egg cells escaping into the water. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The descendants of individuals like the hunter may unite to form a city, and the descendants of the egg cell may, by combining, give rise to the starfish. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity This globular mass of protoplasm is the egg cell, or female cell, and the cell containing it is called the “oögonium.” Elements of Structural and Systematic Botany For High Schools and Elementary College Courses These are much smaller than the egg cell, and resemble the zoöspores in form, but are much smaller, and without chlorophyll. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses By careful observation the student may possibly be able to follow the spermatozoid into the oögonium, where it enters the egg cell at the clear spot on its surface. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses B, surface view, the others in optical section. o, egg cell, × 150. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The results of such experiments are as yet rather conflicting, but it is evident enough from them that we can no longer look upon the egg cell as a simple undifferentiated cell. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity The act of fertilization may be easily observed by laying fresh antheridia into a drop of water containing recently discharged egg cells. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Within a few minutes after putting the oögonia into water, the egg cells may be seen to escape into the water, when some of the antheridia may be added. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses J, a single egg cell surrounded by spermatozoids. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses I, a ripe archegonium in the act of opening, × 150. o, egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses It is clear, then, that we must look upon organization as something superior to cells and something existing within them, or at least within the egg cell, and controlling its development. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity If a ripe archegonium is placed in water, it soon opens at the top, and the contents of the canal cells are forced out, leaving a clear channel down to the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses F, open apex of the same, × 150. o, egg cell. b, ventral canal cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The first wall in the embryo is nearly at right angles to the axis of the archegonium and divides the egg cell into nearly equal parts. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses With a little patience, one or more may be seen to enter the open neck through which it forces itself, by a slow twisting movement, down to the egg cell. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The first divisions of the fertilized egg cell resemble those in the moss embryo, except that the first wall is parallel with the archegonium axis, instead of at right angles to it. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The egg cell is very large, and appears of a yellowish color, and filled with large drops that give it a peculiar aspect. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
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