| 单词 | unfertilized |
| 例句 | “All they can do, really, is lay unfertilized drone eggs. They’ll fill up the combs with them, and as the workers naturally die off, there are none to replace them.” The Secret Life of Bees 2002-01-01T00:00:00Z A tilled, fertilized, watered, weeded garden provides growing conditions very different from those on a dry, unfertilized hillside. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z Some historians and other humanists treat the modern era as if it suddenly popped out of a chicken, “like an unfertilized egg,” Mr. Smail said. ?Deep History? Takes Humanity Back to Its Origins 2011-09-26T22:30:59Z The team collected a sample for dissection to see whether these eggs were empty cradles, like unfertilized chicken eggs at the grocery store. Treasure trove of skate egg "mermaid purses" found in deep sea 2023-10-12T04:00:00Z Apparently, instead of finding an alternative mate, Alfie waited and waited and waited — until she finally laid a clutch of unfertilized eggs. What an orphan owl taught an ecologist about bird intelligence 2023-10-01T04:00:00Z After discovering that he could stimulate asexual reproduction by treating unfertilized sea urchin eggs with simple salt solutions, he became convinced that nature's way of doing things with living matter is not the only way. Synthetic Morphology Lets Scientists Create New Life-Forms 2023-05-31T04:00:00Z Many species are parthenogenic and exhibit haplodiploidy, a method of gender determination in which a fertilized egg develops into a female and an unfertilized egg develops into a male. Fundamentals of Biology 2015-01-01T00:00:00Z Some exceptions exist: For example, in bees, wasps, and ants, the male is haploid because it develops from an unfertilized egg. Concepts of Biology 2013-04-25T00:00:00Z If the transfer is interrupted somehow — by competing love interests, for example, or even clumsiness — the eggs may drop or end up unfertilized. Scientists Breed Sea Dragons, but Not by the Seashore 2023-03-17T04:00:00Z Though the technology for freezing an embryo has existed since the 1980s, preserving an unfertilized egg was a technical challenge that most scientists didn’t think was worthy of solving. What to Know Before You Freeze Your Eggs 2022-12-23T05:00:00Z Meiotic drive is a type of competition within the genome of unfertilized eggs, where variations of different genes can manipulate the cell division process to favor their own transmission to the offspring over other variations. Most human embryos naturally die after conception 2022-09-05T04:00:00Z Some exceptions exist: for example, in bees, wasps, and ants, the male is haploid because it develops from unfertilized eggs. Fundamentals of Biology 2015-01-01T00:00:00Z Fruits such as seedless cucumbers can be induced to set fruit by treating unfertilized plant flowers with auxins. Biology for AP Courses 2022-06-09T00:00:00Z In a subsequent experiment, the researchers took crustaceans that had spent time in tanks with reproductive male Gracilaria gracilis and transferred them to tanks with unfertilized female algae. Like Bees of the Seas, These Crustaceans Pollinate Seaweed 2022-07-28T04:00:00Z Once inside the female reproductive tract, they will use this ability to move independently toward the unfertilized egg. Anatomy and Physiology 2013-06-19T00:00:00Z Next, scientists retrieve an unfertilized egg from another donor animal. A woman cloned her pet after it died. But it’s not a copycat. 2022-04-11T04:00:00Z Conservation geneticists working to preserve endangered California condors have discovered two instances of chicks hatching from unfertilized eggs — the first known cases of so-called virgin births within the species. Endangered California Condors Can Reproduce Asexually, Study Finds 2021-10-30T04:00:00Z Researchers with the San Diego Zoo Wildlife Alliance said genetic testing confirmed that two male chicks hatched in 2001 and 2009 from unfertilized eggs were related to their mothers. Study finds California condors can have ‘virgin births’ 2021-10-28T04:00:00Z One of her patients froze both embryos with her partner in addition to unfertilized eggs, just in case. The Latest Issue in Divorces: Who Gets the Embryos? 2021-04-03T04:00:00Z Fertilization must occur in the distal uterine tube because an unfertilized oocyte cannot survive the 72-hour journey to the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z Native to Central America, the clonal ant Platythyrea punctata has evolved a trait rare among ants: It can produce daughters from unfertilized eggs. What can ants, bees, and other social insects teach us about aging? 2021-03-25T04:00:00Z Yes, but, the show introduced the unfertilized eggs as the last hope for the Frog species, the whole purpose of the two-part mission that nearly got Mando and the Razor Crest eaten by frost spiders. The weirdest pop culture of 2020 2020-12-18T05:00:00Z "Because we are injecting unfertilized eggs, we thought that we would only be able to perform gene editing on the alleles inherited from the mother. Paternal DNA isn't in these unfertilized oocytes," Menke said. The first gene-edited lizard walks among us 2019-09-04T04:00:00Z Some to freeze unfertilized eggs for future use. My IVF life: the moody, exhausting, doughy hormones and egg retrievals 2018-07-23T04:00:00Z “People have henhouses and eat unfertilized eggs, but you really don’t want a rooster,” Wood said. Rescued sacrificial rooster terrorizes a Miami neighborhood 2018-05-28T04:00:00Z The marbled crayfish is the only crustacean that reproduces asexually, with the all-female species making clones of itself from eggs unfertilized by sperm. An aquarium accident may have given this crayfish the DNA to take over the world 2018-02-05T05:00:00Z The only previous trial using ES cells to treat Parkinson’s began last year in Australia; participants there received stem cells from parthenogenetic embryos — unfertilized eggs that are triggered in the lab to start embryonic development. Trials of embryonic stem cells to launch in China 2017-05-30T04:00:00Z Unlike other insects, these stocky invasive ants—about as long as a U.S. nickel is thick—lack queens in their colonies; instead each one lays unfertilized eggs that develop as clones. World’s first genetically modified ants shed light on how complex insect societies evolved 2017-03-08T05:00:00Z Although both fertilized and unfertilized eggs are probably eaten by thousands of species, the practice of consuming eggs from the same species has led to an interesting take on the “kids meal.” In Many Species, a Family Dinner Means Something Else 2017-01-30T05:00:00Z But Mojberg hadn’t found a male for her, and after laying a few hundred unfertilized eggs, she died. Bizarre-Looking Beetle Has an Even Weirder Sex Life Poachers target sturgeon for their meat and unfertilized eggs, which are made into caviar. Black Market Caviar Threatens California's Giant Fish Ritchie: The simple way of describing nuclear transfer is that you take an oocyte, an unfertilized egg, and you remove the chromosomes. Dolly at 20: The inside story on the world’s most famous sheep 2016-06-28T04:00:00Z Everyone in Fruitlands wore specially designed tunics and lived on plants grown in the commune’s soil—which, by the way, remained unfertilized, because Alcott claimed manure was too filthy. This Is Why Vegetarianism Didn't Catch on Until Recently 2016-02-23T05:00:00Z Female mountain chickens build underground foam nests, where they feed their tadpoles unfertilized eggs. The Mountain Chicken Frog’s First Problem: It Tastes Like… 2016-01-28T05:00:00Z When the tadpoles hatch, they fall in the water, where the females feed them unfertilized eggs until they turn into froglets. 'Extinct' Frog Rediscovered After 150 Years, Eats Mom's Eggs 2016-01-20T05:00:00Z After feeding male mice either a high-fat or low-fat diet, the scientists injected the animals’ sperm into unfertilized eggs. Are you inheriting more than genes from your father? 2015-12-31T05:00:00Z In theory, this approach means that all researchers have to do is simply isolate and modify an unfertilized egg in order to modify a genome. NAS panel tackles—and is tackled by—genome editing in animals 2015-12-18T05:00:00Z But the eggs laid by the females were unfertilized. The Fight to Save a Prairie Chicken 2015-09-04T04:00:00Z The adelgid is native to China and Japan and is parthenogenetic, which means all individuals are female and offspring develop from unfertilized eggs. Biological predators attacking invasive species in Conn. 2015-07-18T04:00:00Z For the study, the team removed the nucleus of patients' cells and implanted them into unfertilized human eggs in which the mitochondria remained, but the rest of the DNA was removed. Scientists use 'therapeutic cloning' to fix mitochondrial genes 2015-07-15T04:00:00Z For women with cancer who opt for cryopreservation, one issue is whether to freeze and store unfertilized eggs, called oocytes, or fertilized eggs – embryos created with their partner. Preparing for a Baby After Cancer 2015-06-19T04:00:00Z So far the pair have disappointed scientists, with the female laying clutch after clutch of unfertilized eggs. Scientists Make Novel Attempt to Save Giant Turtle Species 2015-05-25T04:00:00Z Normally, unfertilized animal eggs have only one set of chromosomes. The Strange Tale of a New Species of Lizard 2014-12-18T05:00:00Z But a few researchers have stuck with an older approach—putting a donor nucleus into an unfertilized egg and deriving stem cells from the resulting embryo. Stem cell recipes go head to head 2014-11-07T05:00:00Z Another technique, called maternal spindle transfer, starts with an unfertilized egg from a woman with mitochondrial mutations, explained Oregon's Mitalipov, who has used the technique in monkeys and said it is ready for human trials. FDA weighs evidence on producing 'three-parent' embryos 2014-02-25T22:03:51Z The technique announced on Wednesday, by scientists at Oregon Health & Science University and the Oregon National Primate Research Center, uses unfertilized human eggs. Scientists create human stem cells through cloning 2013-05-15T16:09:22Z By the early 1980s, scientists had figured out that sand tiger hatchlings start to consume others in the womb, along with unfertilized eggs, starting around five months into their gestation. For sand tiger sharks, a deadly, cannibalistic battle inside the womb is part of evolution 2013-05-01T04:01:00Z These designer offspring are a consequence of a reproductive quirk known as haplodiploidy, in which unfertilized eggs develop as males and fertilized eggs become females. ScienceShot: Why Queens Prefer Daughters 2013-02-22T20:05:00Z Here's how it would work: Doctors would need unfertilized eggs from the patient and a healthy donor. Oregon scientists make embryos with 2 women, 1 man 2012-10-25T17:58:09Z The aim of a nuclear-transplant experiment is to insert the nucleus of a specialized cell into an unfertilized egg whose nucleus has been removed. Transplanted Nuclei and Cell Differentiation, by Sir John B. Gurdon 2012-10-09T23:45:00.177Z The unfertilized eggs, stimulated by electric pulses to start dividing, developed to about the 150-cell stage. Scientists create human stem cells through cloning 2013-05-15T16:09:22Z Some of the sand tiger shark’s close relatives, including great white and mako sharks, consume unfertilized eggs while in utero, too, but they do not eat their hatchling brothers and sisters. For sand tiger sharks, a deadly, cannibalistic battle inside the womb is part of evolution 2013-05-01T04:01:00Z The queen can lay either fertilized or unfertilized eggs. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z In 2007, however, scientists at International Stem Cell, a California-based biotech firm, reported the first successful creation of human stem cell lines from unfertilized eggs. You Say Embryo, I Say Parthenote 2011-11-04T12:15:04.510Z Paying for eggs Women who donate their unfertilized eggs to research deserve to be paid, concluded a report released on 10 October by the influential Nuffield Council on Bioethics, an independent charity based in London. Seven days: 13 October 2011 2011-10-12T17:20:21.333Z As a first step, they took the DNA-carrying nuclei from skin cells of diabetic patients and added them to unfertilized human eggs. Cloning Offers Stem-Cell Hope 2011-10-05T23:57:52Z So they had placed two suitable eggs, and five unfertilized eggs, under the hen. Natalie: A Garden Scout 2011-09-18T02:00:30.203Z Hydra.Hydra showing gonads.Starfish egg—fertilized and unfertilized. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z After fertilization the flower droops, to be out of the way of the bees in their visits to the unfertilized blossoms. Wayside and Woodland Trees A pocket guide to the British sylva 2010-12-25T03:00:16.510Z In Britain, direct payment for unfertilized eggs is prohibited; in the United States, rules vary by state. Seven days: 13 October 2011 2011-10-12T17:20:21.333Z The highest concentrations are found in unfertilized buds of the female plant, which yield the most expensive strains. Reefer Sadness for Pot Farmers 2010-10-28T03:00:00Z Or what about those insects where males hatch from unfertilized eggs, but females have “normal” genetics — can sexual tensions be more easily resolved? Evolving Sexual Tensions 2010-03-30T22:30:00Z Her children all arose from unfertilized eggs and were therefore male drones, contributing nothing to the welfare of the colony. 2010-01-18T05:00:00Z While the “summer eggs” are unfertilized, the winter eggs are fertilized by the male, and possess the remarkable power of lying dormant for months or even years before they develop. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" Often the unfertilized ovum is carried away with it, but the two things do not necessarily happen at the same time. The Sex Side of Life An Explanation for Young People In other words, the fertilized egg is retained within the body, while the unfertilized one is cast off. Treatise on the Diseases of Women Of the few that are still surviving, some produce such small and inconspicuous blossoms that the insects scarcely see them, and they go unfertilized. The Meaning of Evolution These eggs, if left unfertilized, will pass from the body and never grow any more. Every Girl's Book In deep water where neither drought nor winter cold can seriously affect the Daphnias, they propagate all the year round by unfertilized “summer” eggs. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" Some may fall at once, like the unfertilized ones. The Renewal of Life; How and When to Tell the Story to the Young I have seen one 32-acre orchard of 24-year-old filbert trees that was injured beyond repair, but they were crowded and unfertilized. Northern Nut Growers Association Report of the Proceedings at the 41st Annual Meeting Pleasant Valley, New York, August 28, 29 and 30, 1950 Here is, for instance, a view of a fertilized and an unfertilized section of one of our experiments in Georgia. Northern Nut Growers Association Report of the Proceedings at the Fourteenth Annual Meeting Washington D.C. September 26, 27 and 28 1923 Its abdomen, too, seemed enormous, all swelled and distended with unfertilized eggs. Barbarians Of the fertilized trees within the experimental tract, 55 per cent showed injury to some degree as compared with 58 per cent of the trees unfertilized, also within the tract. Northern Nut Growers Association Report of the Proceedings at the Fifteenth Annual Meeting New York City, September 3, 4 and 5, 1924 Standing on the lawn uncultivated and unfertilized, hemmed in on three sides by other trees, it gave us at least three bushels of fine nuts. Northern Nut Growers Association, Report of the Proceedings at the Third Annual Meeting Lancaster, Pennsylvania, December 18 and 19, 1912 The "Column" in Various Orchids Many of our common wild flowers, as perfectly and effectually planned for cross-fertilization as the orchids, do retain the reserve power of final self-fertilization if unfertilized by foreign pollen. My Studio Neighbors Three slides of fertilized and unfertilized trees from still different experiments all show the fuller foliage and better branching of the fertilized trees, especially those fertilized with the nitrogenous fertilizers or the complete fertilizers. Northern Nut Growers Association Report of the Proceedings at the Fourteenth Annual Meeting Washington D.C. September 26, 27 and 28 1923 I am not inclined to believe it if this preëxistence is taken in a general sense; but in limiting it to individuals in which the unfertilized embryos or germs are formed before generation. Lamarck, the Founder of Evolution His Life and Work Longitudinal section of the summit of a shoot bearing a nearly mature sporogonium, sg, still enclosed in the calyptra; ar′, archegonia which have remained unfertilized; st, stem; b, leaf; p, perianth. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Nevertheless, heat is a well-known chemical agent, and the application of heat to a fertilized, and to an unfertilized, germ develops a whole world of difference between them. Fables of Infidelity and Facts of Faith Being an Examination of the Evidences of Infidelity I used a commercial fertilizing compound around about half of these seedlings which greatly increased their rate of growth, although they became less hardy than the unfertilized ones. Growing Nuts in the North A Personal Story of the Author's Experience of 33 Years with Nut Culture in Minnesota and Wisconsin The yields of these trees cannot here be taken up but, in general, these fertilized trees came into bearing earlier and have yielded double and treble the number of nuts produced by the unfertilized trees. Northern Nut Growers Association Report of the Proceedings at the Fourteenth Annual Meeting Washington D.C. September 26, 27 and 28 1923 Better a thousand times never open the furrow than to leave it unfertilized. The Investment of Influence A Study of Social Sympathy and Service These strips are to be left unfertilized and are for the purpose of preventing one plot being affected by the plant food of another. The First Book of Farming In the bird, the egg, fertilized or unfertilized, passes out of the body and, being of conspicuous size, is readily observed. The Dollar Hen It was virgin as the soil of the moorland—a soil as yet untamed and unfertilized by the labour of man. Deadham Hard The difference of appearance between fertilized and unfertilized ova treated by the method will demonstrate its utility. Scientific American Supplement, No. 392, July 7, 1883 As an average of these twenty-four years, the addition of mineral plant food produced increases in crop yields above the unfertilized land as follows: Corn increased forty-five per cent. The Story of the Soil; from the Basis of Absolute Science and Real Life, If the unfertilized eggs perish without hatching, those which hatch and produce males are therefore fertilized; and the German theory falls to the ground. Bramble-Bees and Others |
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