Tag: "fertilization" at biology news
Subtle Biotic Changes Have Big Environmental Impact
...ificance, said Carpenter. "To what extent could fertilization
of the oceans and alteration of oceanic food webs affect global carbon cycles? In fact, runoff from land is now enriching coastal oceans to unprecedented levels, and industrial fishing is causing massive changes in marine food webs. So the glob...
Second Gene Responsible For Tuberous Sclerosis Complex Identified
... mutations arebelieved to occur around the time of fertilization
and account for more than 50percent of TSC cases. "Much of the motivation for our research comes from the fact that aroundone-half of children with tuberous sclerosis are moderately to severelyaffected, and this creates lifelong worry for parents an...
Biologist Experiments With His Own Front Yard
... literally blowshimself apart to insure successful fertilization
(maybe); the promiscuous female rove beetle, who thejealous male follows around after the act to try to insure that the offspring are his; male praying mantiseswho sometimes become a protein-rich snackfor their mate during or even prior to copulation...
At Life's Most Sensitive Stage, Embryos Cope With Stress
...tide to get sperm and egg togetherclose enough for fertilization
to begin. Previous studies assumed that these orga...er is turbulent - good for distribution,but with a fertilization
success rate likely to be 1 percent or less. Brawleyand her research team studied Fucus, a brown sea...
When To Reproduce? It's All In The Timing
... are those which reproduce in the water byexternal fertilization
-- some species of fish, corals, and plants such a...hatknack for good timing, i.e., that their rate of fertilization
success borders onone percent or less. These studies have used an underlying assumption tha...
Human Bone Disorder Reproduced In Mice
...that theMAS mutation is lethal if it occurs before fertilization
(in the egg or sperm). In this case, the mutation would affect all cells in the embryo and lead toearly embryo death. The investigators felt that the same principle might applyto individual lesions in MAS patients. If only mutant cells were present...
UB Fertility Researchers Find They Can Predict Pregnancy By Assessing Two Sperm Abnormalities
... has penetrated the egg, the sperm head swells and fertilization
becomes impossible. "In our study, when preg...that the sperm failed at one or more points in the fertilization
process." For this study, researchers analyzed semen samples from 250 consecutive patients who ...
Mouse Study Trumpets New Way To Preserve Species
...Critser says. "Using methods such as in vitro fertilization
and embryo transfer for an animal requires detailed knowledge about the animal's physiology and how its reproductive tissues respond in various situations. Generally, this work must be done on a species-by-species basis." The current findings al...
LSU Ag Center Program Focuses On Helping Animals Reproduce; Graduates Assist Humans, As Well
...later use, and in vitro fertilization, which means fertilization
ina test tube or on a dish under a microscope. Godke and his graduate students have played a major role in bringingabout the practical use of all of these techniques. In the mid-1970s, hisprogram, along with others, helped perfect non-surgic...
Bird Dads Suffer Infidelity But Bring Up Baby
...gistscall extra-pair fertilizations. -- Extra-pair fertilization
rates rose above 70 percent where the researchersobserved the females mating promiscuously. Jacanas copulate at a high ratecompared with most bird species. While a single copulation would provide enoughsperm to fertilize a clutch of four eggs, the ...
New study establishes when pregnancy starts
...ut whenpregnancy starts in humans - how long after fertilization
does pregnancy begin,"Wilcox said. "It probably has implications for assisted reproduction -- the waymedicine is able to manipulate reproductive processes to encourage pregnancy -possibly by increasing the narrow implantation 'window.' We may want to...
Cystic fibrosis gene undetected in screening of infertile men
...brosis. "Dramatic advances in surgery and in vitro fertilization
have given many menwith infertility an opportunity to father children, which they could not havedone 20 years ago," says Jarvi. "But we're now finding out that we may beputting some of these children at a higher risk of being born with cysticfibrosi...
Fathers pass infertility to sons
...sons conceived with the aid ofa popular in vitro fertilization
technique can inherit the same geneticdefects that...d three men who fathered sons through awidely used fertilization
technique called intracytoplasmic sperm injection(ICSI). In each case, the fathers passed on a Y chr...
Fly vs. fly
...tilize as many eggs as possible and to prevent the fertilization
of as manyeggs as possible by his competitors. "The mystery is why the second male nearlyalways defeats the first male," Price says. Some species have evolved infinitely more elaborate means of oustingsperm from the female than the fruit fly...
Research puts sting into drama of virus-cell fusion
...irus, but also to normal cellular processessuch as fertilization
of an egg by a sperm," says David Sanders, assistantprofessor in Purdue's Department of Biological Sciences. Working with doctoral student Gwen Taylor of Monaca, Pa., Sanders discoveredthe importance of an amino acid sequence that is part of a pr...
Search and support for the rare white abalone is on; sex must occur with close neighbors
...ing their eggs and sperm into theseawater, and for fertilization
to occur, the spawners need to be within threefeet of a member of the opposite sex to effectively reproduce. "No neighborsmeans that the remaining animals are effectively sterile," said Kevin Lafferty,assistant professor of marine biology at UC Santa...
On the floor of the sea: USGS biologists search for rare, white abalone
...ing their eggs and sperm into theseawater, and for fertilization
to occur, the spawners need to be within threefeet of a member of the opposite sex to effectively reproduce. Withoutneighbors, the remaining animals are effectively sterile, said Lafferty. "We will move isolated individuals next to each other to give...
How a gene tells plant to reject its own pollen
...cientists discovered that some plants don't permit fertilization
by their own pollen. And for the past quarter-cen...nts have developed various mechanisms to avoid the fertilization
of their ovules by their own pollen, favoring pollen grains from another plant of the same species,"...
Mouse embryo hints at how mammalian body forms
...ss of cells that forms in the first days following fertilization
of the egg has already taken on an organizational structure and begun to initiate events that predict the spatial patterning of the later embryo. They made their discovery by tracing the fate and behavior of a key group of cells in the early em...
BES and ESA to meet: Two plenary sessions to focus on carbon
...soil matter is long enough to ensure that this CO2 fertilization
will result in a sink over the next few decades. Ultimately, says Grace, the sink will vanish as CO2 response begins to saturate and the warming temperatures cause the stored organic matter to break down. Grace will explore the tools used for keepi...
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