| 单词 | calcium ion |
| 例句 | But, with luck, the addition of magnesium or possibly calcium ions to the sugar-phosphate backbone would quickly generate an elegant structure, the correctness of which would not be debatable. Double Helix 1968-02-27T00:00:00Z In other words, the crustaceans and snail worked harder to transport the calcium ions they required in an environment where calcium was harder to find. Consistent metabolism may prove costly for insects in saltier water 2023-10-06T04:00:00Z Calcitonin is released in response to rising calcium ion concentrations in the blood and has the effect of reducing those levels. Concepts of Biology 2013-04-25T00:00:00Z The carbon dioxide reacts with calcium ions in cement, one of the ingredients of concrete. NYC skyscrapers turning to carbon capture to lessen climate change 2023-05-14T04:00:00Z The cell expands from the water, activating another channel that takes in calcium ions. How cancer cells move and metastasize is influenced by the fluids surrounding them 2023-01-10T05:00:00Z For example, the relative amount of calcium ion, Ca2+, in the water should be maintained within certain limits to prevent eye irritation and avoid damage to the pool bed and plumbing. Chemistry 2019-02-14T00:00:00Z In contrast, the insects' metabolic rates remained constant in both saline and dilute environments, even though they had a higher calcium ion transport rate in the saline environment. Consistent metabolism may prove costly for insects in saltier water 2023-10-06T04:00:00Z Parathyroid hormone increases blood calcium concentrations when calcium ion levels fall below normal. Concepts of Biology 2013-04-25T00:00:00Z Decreasing the concentration of free calcium ions will prevent heterocyst development. Biology for AP Courses 2022-06-09T00:00:00Z These calcium ions activate another type of protein filament called myosin that induces the cell to move. How cancer cells move and metastasize is influenced by the fluids surrounding them 2023-01-10T05:00:00Z Because the amount of calcium ion added does not result in exceeding the solubility products for other calcium salts, the anions of those salts remain behind in the wastewater. Chemistry 2019-02-14T00:00:00Z The release of calcium ions initiates muscle contractions. Anatomy and Physiology 2013-06-19T00:00:00Z Free calcium ions have a positive charge that attracts the negatively charged clay particles, encouraging aggregation. How to make the best of clay soil in the garden 2022-02-15T05:00:00Z PTH increases blood calcium concentrations when calcium ion levels fall below normal. Biology for AP Courses 2022-06-09T00:00:00Z Schmidt-Kaler is an expert on a type of ion trap in which electric fields are used to confine a single calcium ion. This Simple Experiment Could Challenge Standard Quantum Theory 2021-10-21T04:00:00Z As defined in the ICE table, x is the molarity of calcium ion in the saturated solution. Chemistry 2019-02-14T00:00:00Z One common alternative system uses calcium ions as a second messenger. Anatomy and Physiology 2013-06-19T00:00:00Z In 1988, a pair of plant scientists hypothesized that two overlapping rushes of calcium ions might spur the Venus flytrap to close, but had no way to test their idea. Why Scientists Made Venus Flytraps That Glow 2020-10-12T04:00:00Z It is stimulated by decreased blood calcium ion concentrations, blood pressure, blood volume, or increased amounts of blood potassium. Biology for AP Courses 2022-06-09T00:00:00Z In calcium imaging, for instance, animals are genetically engineered to express a molecule in their cells that detects calcium ions — when these pour into a neuron as it fires, the molecule fluoresces. Inside the mind of an animal 2020-08-10T04:00:00Z There are four calcium ions and eight fluoride ions in a unit cell, giving a calcium:fluorine ratio of 1:2, as required by the chemical formula, CaF2. Chemistry 2019-02-14T00:00:00Z As a result, calcium is released from the bones into the circulation, thus increasing the calcium ion concentration in the blood. Anatomy and Physiology 2013-06-19T00:00:00Z In a paper published last week in Nature Plants, researchers reported they had found the cause: calcium ions. Why Scientists Made Venus Flytraps That Glow 2020-10-12T04:00:00Z Calcitonin release is not controlled by TSH, but instead is released when calcium ion concentrations in the blood rise. Biology for AP Courses 2022-06-09T00:00:00Z The gap junction permits the exchange of small molecules and calcium ions, but prevents the passage of large objects such as organelles. Evidence that tunnelling nanotube-like structures connect cells in mice 2020-08-11T04:00:00Z The orientation of the four calcium ions about the fluoride ions differs. Chemistry 2019-02-14T00:00:00Z These include various electrolytes, such as sodium, potassium, and calcium ions; dissolved gases, such as oxygen, carbon dioxide, and nitrogen; various organic nutrients, such as vitamins, lipids, glucose, and amino acids; and metabolic wastes. Anatomy and Physiology 2013-06-19T00:00:00Z This gene, widely used in biology, produces a protein that turns fluorescent green when it binds to a target — in this case, a calcium ion. Why Scientists Made Venus Flytraps That Glow 2020-10-12T04:00:00Z Functions of the SER include synthesis of carbohydrates, lipids, and steroid hormones; detoxification of medications and poisons; and storage of calcium ions. Biology for AP Courses 2022-06-09T00:00:00Z In a preprint on bioRxiv last month, Shapiro’s team reported that exposing mouse neurons in a dish to ultrasound opens a particular set of calcium ion channels to render certain cells more excitable. Aiming ultrasound at the brain raises hope of new treatments 2020-06-24T04:00:00Z The name of a metal ion is the same as the name of the metal atom from which it forms, so Ca2+ is called a calcium ion. Chemistry 2019-02-14T00:00:00Z At this point, calcium ion channels open and Ca2+ enters the cell, further depolarizing it at a more rapid rate until it reaches a value of approximately +5 mV. Anatomy and Physiology 2013-06-19T00:00:00Z After a single tap to a sensory hair, a green flush appeared at the hair’s base and quickly spread across the leaves, indicating a surge of calcium ions. Why Scientists Made Venus Flytraps That Glow 2020-10-12T04:00:00Z The SER synthesizes carbohydrates, lipids, and steroid hormones; engages in the detoxification of medications and poisons; and stores calcium ions. Biology for AP Courses 2022-06-09T00:00:00Z Plankton that evolved 170 million years ago pulled huge amounts of carbon and calcium ions from the seas to build their shells and skeletons. Daily briefing: Scientists reconstruct butterfly evolutionary history with CRISPR 2019-10-02T04:00:00Z Thus, we must have two negative charges to balance the 2+ charge of the calcium ion. Chemistry 2019-02-14T00:00:00Z Epinephrine and NE have similar effects: binding to the beta-1 receptors, and opening sodium and calcium ion chemical- or ligand-gated channels. Anatomy and Physiology 2013-06-19T00:00:00Z This is because structures on the glial-cell membrane, called gap junctions, enable signalling molecules, such as calcium ions, to move into neighbouring glial cells5. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z In muscle cells, a specialized SER called the sarcoplasmic reticulum is responsible for storage of the calcium ions that are needed to trigger the coordinated contractions of the muscle cells. Biology for AP Courses 2022-06-09T00:00:00Z For matter, Lanyon’s team used a so-called trapped ion—a single calcium ion confined to an optical cavity using electromagnetic fields. The Quantum Internet Is Emerging, One Experiment at a Time 2019-06-19T04:00:00Z All of the tetrahedral sites in the FCC array of calcium ions are occupied by fluoride ions. Chemistry 2019-02-14T00:00:00Z Drugs known as calcium channel blockers slow HR by binding to these channels and blocking or slowing the inward movement of calcium ions. Anatomy and Physiology 2013-06-19T00:00:00Z The depolarization of glioma cells induced by neuronal activity caused a transient rise of calcium ions in the cytoplasm, which then spread through the network of glioma cells through their gap junctions. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z The SER synthesizes carbohydrates, lipids, and steroid hormones; engages in the detoxification of medications and poisons; and stores calcium ions. Biology for AP Courses 2022-06-09T00:00:00Z As the gas—including the calcium ions—zips around the white dwarf, its light gets Doppler shifted to slightly higher frequencies when moving toward Earth and lower frequencies when moving away. Astronomers spy an iron planet stripped of its crust around a burned-out star 2019-04-04T04:00:00Z Close examination of Figure 10.62 will reveal a simple cubic array of fluoride ions with calcium ions in one half of the cubic holes. Chemistry 2019-02-14T00:00:00Z Several synthetic drugs, including dopamine and isoproterenol, have been developed that mimic the effects of epinephrine and NE by stimulating the influx of calcium ions from the extracellular fluid. Anatomy and Physiology 2013-06-19T00:00:00Z Another factor pushed those first reports to the fringes: scientists studying vesicles did not generally communicate with those who specialized in signalling through calcium ions. How secret conversations inside cells are transforming biology 2019-03-10T05:00:00Z One mechanism our cells share is fluctuating levels of calcium ions, which carry an electrical charge. Watch Plants Light Up When They Get Attacked 2018-09-13T04:00:00Z In fish, these cells maintain normal solute concentrations by regulating the exchange of sodium, chloride and calcium ions between the animals’ tissues and the surrounding water13. Profile of an unknown airway cell 2018-07-31T04:00:00Z This sensor, a protein, emits fluorescent light in response to the increases in calcium ion concentrations that occur in cells when they become active. "Movement Maps" Found Deep Inside Brain 2017-08-30T04:00:00Z Higher concentrations of intracellular calcium ions increase the strength of contraction. Anatomy and Physiology 2013-06-19T00:00:00Z It contains proteins similar to those from snails as well as positively charged calcium ions. Stretchy glue inspired by slugs could be the future of sutures 2017-07-27T04:00:00Z They led Dr. Gilroy and his team to look into calcium ion flow. Watch Plants Light Up When They Get Attacked 2018-09-13T04:00:00Z It converts a difference in temperature to mechanical work by confining a single calcium ion in a funnel-shaped trap. 'Dead or alive' cat in physics top 10 - BBC News 2016-12-13T05:00:00Z The markers changed shape in the presence of calcium ions and then would change color. Roger Y. Tsien, Nobel Winner for Use of Glowing Proteins, Dies at 64 2016-09-04T04:00:00Z The fast block sets in almost immediately and lasts for about a minute, during which time an influx of calcium ions following sperm penetration triggers the second mechanism, the slow block. Anatomy and Physiology 2013-06-19T00:00:00Z A calcium ion held in a tapered trap is used as the working substance of a tiny thermodynamic engine. A single-atom heat engine | Science 2016-04-14T04:00:00Z It also causes abnormal inflows of sodium and calcium ions in unsevered but damaged axons. Bang to rights 2016-03-03T05:00:00Z In the new engine, a calcium ion converts heat to motion when it is hit by noise coming from a set of electrodes. Scientists build heat engine from a single atom 2015-10-21T04:00:00Z For instance, the researchers found that reducing the amount of calcium ions in the model led to a change in the activity patterns, from synchronized bursts of firing to an asynchronous pattern. Rat brain—or a smidgeon of it—is modeled in a computer 2015-10-08T04:00:00Z The calcium ion, considered factor IV, is derived from the diet and from the breakdown of bone. Anatomy and Physiology 2013-06-19T00:00:00Z A calcium ion held in a tapered trap is used as the working substance of a tiny thermodynamic engine. A single-atom heat engine | Science 2016-04-14T04:00:00Z When the channels open, they let in a flow of calcium ions, which changes the electrical balance of the cell, causing it to emit a pulse of electricity. Testing Neurons With Ultrasound 2015-09-28T04:00:00Z The noise is then turned off, and the calcium ion slows down. Scientists build heat engine from a single atom 2015-10-21T04:00:00Z The researchers also identified the molecular mechanisms—particularly the role of signals from calcium ions—involved in this effect. Bioelectrical Signals Can Stunt or Grow Brain Tissue 2015-03-10T04:00:00Z In addition, the sarcoplasmic reticulum stores few calcium ions, so most of the calcium ions must come from outside the cells. Anatomy and Physiology 2013-06-19T00:00:00Z Mozzarella stays stringy because calcium ions in the cheese help hold the proteins together. Video: Science explains why pizza tastes so darn good 2014-10-14T04:00:00Z Calcium channel blockers prevent calcium ions from entering cell membranes in the heart and arteries, a process that normally signals the blood vessels to contract. Common Prescription Drugs Alter Blood’s Flow 2014-08-02T04:00:00Z Some are involved in the activity of a second transmitter molecule, glutamate; others regulate the flow of calcium ions into cells. Some needles in the haystack 2014-07-22T04:00:00Z DNA variants affecting the calcium ion channel seemed to lead to Savannah's epilepsy. Genetics: Complex expressions : Nature : Nature Publishing Group 2014-07-08T04:00:00Z The drug digitalis lowers HR and increases the strength of the contraction, acting as a positive inotropic agent by blocking the sequestering of calcium ions into the sarcoplasmic reticulum. Anatomy and Physiology 2013-06-19T00:00:00Z The result was a fusion of the calcium ions and the Berkelium to produce Ununseptium, which then quickly decayed into elements 115 and 113, as observed by the previous Russian-American team. Scientists Confirm The Existence Of Element 117 2014-05-04T00:27:00Z Among other effects, that study said, the chemicals impede the process by which calcium ions in heart muscle prompt regular heartbeats. Fish Embryos Exposed to Oil From BP Spill Develop Deformities, a Study Finds 2014-03-25T00:29:39Z And calcium ions flow not just in the brain, but in the entire body. Some needles in the haystack 2014-07-22T04:00:00Z In studying nerve cells, he discovered that when the vesicle's molecular machinery senses calcium ions, it triggers the docking process. Trio Wins Nobel Prize for Medicine 2013-10-07T23:53:34Z At the same time, IP3 causes calcium ions to be released from storage sites within the cytosol, such as from within the smooth endoplasmic reticulum. Anatomy and Physiology 2013-06-19T00:00:00Z The team bombarded a thin film of the element americium with calcium ions, which allowed them to measure photons in connection with the new element's alpha decay. Evidence for new element boosted 2013-08-27T14:26:04Z The calcium ions then jump to a neighboring cell and the death wave continues. Glowing, Glowing, Gone: Cell Fluorescence Casts Light on How Death Spreads Throughout Body 2013-08-02T14:45:03.653Z The neurotransmitter made these receptors hyperactive, ushering a flood of calcium ions into the neuron. Understanding Alzheimer’s disease: Beta testing 2013-06-20T15:05:37Z Signals inside astrocytes are often carried by rapid waves of calcium ions that respond to neurotransmitters stimulating receptors on their cell membrane. Human Brain Cells Make Mice Smart 2013-03-07T17:45:00.740Z The calcium ions then act as second messengers in two ways: they can influence enzymatic and other cellular activities directly, or they can bind to calcium-binding proteins, the most common of which is calmodulin. Anatomy and Physiology 2013-06-19T00:00:00Z Because neuronal firing requires an influx of calcium ions, this method provided a way to view cells in action. Mapping brain networks: Fish-bowl neuroscience 2013-01-23T18:20:53.800Z The cells in a sponge’s body also communicate with waves of calcium ions not unlike the cascades of charged particles that surge down neurons in more complex animals. Why We Need to Study the Brain's Evolution in Order to Understand the Modern Mind 2012-09-20T16:15:02.840Z In one tantalizing clue, the Allen Institute researchers point to differences in a gene called CALB1, which is used to move calcium ions, which are key chemical messengers for the nervous system, around. Five Surprises From Billionaire Paul Allen's Mind Map 2012-09-19T17:46:45Z Further experiments revealed that injured cells initiate a wave of elevated calcium ion concentration that travels through the brain, and that the microglia only begin migrating when the wave reaches them. The Brain's Bat Signal 2012-05-24T18:40:00Z It opens chemical- or ligand-gated sodium and calcium ion channels, allowing an influx of positively charged ions. Anatomy and Physiology 2013-06-19T00:00:00Z That stretching makes their membranes more porous, allowing calcium ions to flood into the neuron and activating enzymes that alter tau proteins just as they are altered in Alzheimer's. Revealing brain damage from battlefield to playing field 2012-05-16T18:09:17Z To test that idea, they decided to modify one of the bacterial species, Caulobacter vibrioides, shaping its surface to attract calcium ions, and see what happened. Genetically Engineered Bacteria Could Help Fight Climate Change 2012-02-26T17:00:00Z It also promotes remineralization by sticking to tooth surfaces, where it attracts calcium ions present in saliva. Well Blog: Dental Exam Went Well? Thank Fluoride 2012-01-23T21:57:21Z Using a pulse of calcium ions as a stimulant, they persuaded the cells to start dividing. Stem cells: The nuclear option 2011-10-05T18:17:42Z These factors include sympathetic stimulation, the catecholamines epinephrine and norepinephrine, thyroid hormones, and increased calcium ion levels. Anatomy and Physiology 2013-06-19T00:00:00Z At Harvard, Dr. David Clapham, a neurobiologist, discovered that sperm tails contain calcium ion channels, with electrically charged atoms “turbo-charging the sperm” to reach eggs, he said. The Search for a Male Contraceptive That Men Might Not Mind 2011-07-23T20:29:40Z The higher pH released calcium ions taken up from the by carbonaceous polymers that form part of the mat. Microbial Mat Bears Direct Evidence of 3.3 Billion-Year-Old Photosynthesis 2011-07-06T19:45:00.520Z They made them by smashing calcium ions into atoms of plutonium or another element, curium. Two New Elements Added to Periodic Table 2011-06-08T21:37:59Z It is regulated by a group of nerve fibers, the so-called ergoreceptors, that respond to a combination of metabolites released by muscles during exercise — calcium ions, lactate, hydrogen ions. Personal Best: One Runner?s Suffering Is Another?s Inspiration 2011-05-16T15:12:59Z The flow of calcium ions eases communication between neurons, promoting LTP along the reward pathway. Mouse Study Suggests Why Addictions Are Hard to Forget 2011-04-27T11:15:00.243Z As it did, channels in the neurons opened wide, allowing calcium ions to flow into the cells, depressing their ability to metabolize energy. Concussions Special Report: The Crisis for American Kids 2011-02-27T00:32:17Z The explanation is that the contractions release calcium ions in the cells, enabling the muscle fibers to contract more forcefully. Personal Best: Warm-Ups Before Exercise: Many Methods, Little Research 2010-05-17T20:45:00Z |
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