Sentences with phrase «egg cell»

Yet only a small number of egg cells are produced by the female body, so they are the limiting factor in many aspects of reproductive science.

The scientists wanted to understand where these marks come from in egg cells and how mistakes can cause disease.

In addition to being easier to sample than egg cells from women, sperm are more susceptible to environmental influences that could alter the epigenetic tags on their DNA.

Also, the fertility of women with this blood type is reduced by having less egg cells with poorer quality.

One theory is that they arise when immature egg cells go rogue.

This suggested sperm may use these receptors to detect chemicals given off by egg cells, and so help guide the sperm to the egg.

In the study, 72 percent of nearly 3,000 mouse egg cells survived.

The groups said that these cells were able to divide into new egg cells.

However, this method raises the following problem: in every nuclear transfer, a small number of defective mitochondria are transferred into the healthy egg cell.

A technician opens a vessel containing women's frozen egg cells.

The basics of sexual reproduction appear to be very simple: sperm plus egg cell equals embryo.

They found that chromosomes were always distributed correctly in young egg cells, but that a little less than 10 % of older cells suffered from segregation errors.

When the researchers used lab techniques to block this transfer, few egg cells were able to form.

Now researchers report how a chemical in cigarette smoke destroys egg cells.

But on the bright side, women with blood type A are very fertile and lose less egg cells in time, which makes them more capable to get pregnant in older age.

Stem cell researchers performed a laboratory feat this year that was once deemed unthinkable: the artificial creation of egg cells.

Scientists can replace the mitochondria of the mother's egg cell with mitochondria from a healthy donor.

Most countries do not allow scientists to modify human egg cells.

Scientists have already seen the same mark close to the start of active genes in many cells, but the team discovered that its role in egg cells is different.

The scientists starved the cells into quiescence, then transferred their DNA - carrying nuclei into egg cells stripped of their own nuclei.

The procedure transplants nuclear DNA from an egg of a woman with mitochondrial disease into an enucleated egg cell from a woman with healthy mitochondria.

A fertilized human egg cell does not contain a homunculus, but neither is it a structureless drop of viscous liquid.

Lately Van Blerkom has been intrigued by another form of polarity: the way mitochondria, the cell's little power plants, migrate in the maturing egg cell.

All human beings develop from a single cell, which is a female egg cell fertilized by a spermatozoid, thus combining the genes of both the mother and father.

Instead, they rely on transplanting the genetic information from a specialized cell into an unfertilized egg cell whose genetic information has been destroyed or physically removed.

A team led by Dr Gavin Kelsey in the Babraham Institute and colleagues in Dresden and Munich studied a protein called MLL2 and discovered how it produces a distinctive pattern of epigenetic marks that are needed for egg cell stasis.

Adults are highly mobile, or they have help from pollinators or other animal intermediaries that deliver their gametes, such as egg cells and sperm, over long distances.

This ancient theory, recounted by Pliny the Elder, is one of the many bizarre early attempts to explain one of life's greatest mysteries — how a nearly uniform egg cell develops into an animal with dozens of types of cells, each in its proper place.

SCNT is a technique wherein the nucleus from a somatic cell (an adult cell that is not a sperm or egg, i.e. not the gametes) is implanted into an enucleated egg cell which can then be implanted into, and develop in, a surrogate mother, and potentially become an adult organism.

We have proposed simultaneous experiments to optimize the process of cloning Black - footed Ferrets using domestic ferrets as surrogate egg cell donors and mothers, thus avoiding using endangered Black - footed Ferrets for experimental procedures.

The researchers then transferred nuclei from nearly 1900 of the cultured cells into egg cells whose nuclei had been removed, eventually producing six calves.

For you who don't know what is spaying, it is a surgical removal of a female cat's internal reproductive structures and this includes its ovaries or the place where egg cells are produced, Fallopian tubes, uterine horns or the two long tubes where a kitten soon to be develop and grow, and a small part of its uterine body or small parts of uterus which is merged with uterine horns and become one body.

Williams contends that these innovations took hold at least 125 million years ago and made it possible for early angiosperms to evolve more flexible and sheltered modes of fertilization, including ovaries containing egg cells deep inside the plant.

One theologian who writes on the subject — Paul Ramsey — thinks that a human egg cell becomes a human individual with a moral claim to survive if it has been fertilized.

Feric described how giant Xenopus egg cells manage to support thousands of nuclear bodies, membrane-less compartments inside the nucleus.

Researchers have been able to use a cocktail of four genes to directly reprogram differentiated cells into cells closely resembling embryonic stem cells — so - called induced pluripotent stem (iPS) cells — without using nuclear transfer or egg cells at all.

The journey from a single fertilised egg cell through to a baby delivered crying into the arms of its mother is one of the most beautiful and complex processes to occur in nature.

Using a process called somatic cell nuclear transfer (SCNT), a team from Oregon Health & Science University (O.H.S.U.) in Portland implanted the contents of individual skin cells from adult male rhesus macaques into each of 304 macaque egg cells stripped of their genetic material.

They look different too: Charbonneau says they tend to be plumper and more likely to carry egg cells inside their bodies than the more energetic ants.

From this Orange County medical practice, Keirstead plans to obtain donated egg cells for his SCNT research.

The idea is to take a cell from a patient — from skin, for example — and fuse it with a human egg cell emptied of its own chromosomes.

«Mothers and daughters: How starfish egg cells eliminate crucial structures to ensure the embryo will be viable.»

In 2011, a team led by entomologist Susumu Katsuma at the University of Tokyo reported that the W chromosome produces short RNA molecules that keep transposons at bay in newly formed egg cells.

Reporting research in the scientific journal Cell, Vienna - based scientists from the Institute of Molecular Biotechnology (IMBA) have discovered that not only do fertilized egg cells trigger epigenetic reprogramming of sperm DNA but this process is closely monitored to safeguard genomic integrity.

New work from Carnegie's Allan Spradling and Lei Lei demonstrates that mammalian egg cells gain crucial cellular components at an early stage from their undifferentiated sister cells, called germ cells.

Xi says part of the trick is to suck a minuscule amount of cytoplasm out of egg cells first to make room for the injected bacteria and prevent cells from bursting.

It may seem like an arcane debate, but it has life - and - death ramifications every day, when IVF practitioners peer at egg cells through microscopes and try to predict the fate of the embryos they might become.