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Tag: "mature" at biology news

Imaging study links key genetic risk for Alzheimer's disease to myelin breakdown

...most vulnerable process of brain development as we mature and age. These new findings offer, for the first time, compelling genetic evidence that myelin breakdown underlies both the advanced age and the principal genetic risks for Alzheimer disease," said Dr. George Bartzokis, professor of neurology at UCLA...

'Scent of a woman' tells male redback spiders to find a mate

...ve to develop quickly so that they become sexually mature in time to mate with these virgin females before the females mate with someone else." These are opposing pressures, and the researchers found that males are able to gauge which issue is most pressing in their particular situation while they are still...

Alaska seal pup diet may hold key to decline of population

...les may take longer to reach sexual maturation and mature females that are nutritionally stressed may not reproduce, offering clues to why some harbor seal populations are falling, Polasek said. Next steps The seals will continue their low fat and high fat diets as the longitudinal research continues. ...

In a technical tour de force, Salk scientists take a global view of the epigenome

...A methylation in stem cells differs from that in a mature skin or nerve cell. Part of the makeover mature cells must undergo for therapeutic cloning purposes will likely involve remodeling methylation patte...

Study finds how organs monitor themselves during early development

... to have too few germ cells. The animal could well mature with this defect and suffer from reduced fertility. But it does not. Instead, they found that the ovary has a way to sense its lack of germ cells and steps up production. "Within three days, the ovary catches up; it then has enough germ cells," says ...

Bones hold the key to blood renewal

...or transplantation cause the release of many other mature cells as well. Injecting the osteoclast-promoting substance into the mice, on the other hand, resulted in an increase mainly in stem cell release. These findings add a new dimension to our understanding of the processes of renewal and breakdown in th...

First study to show how immune cells 'speak' to each other in vivo

... over the existence and functional significance of mature immunological synapses in vivo during antiviral immune responses. The findings will allow further experimental exploration of immunological synaptic function during normal and pathological immune responses in vivo. The full study can be accessed a...

How IVF could be causing genetic errors in embryos

... in total. As a control, some embryos were left to mature in the mice (in vivo). "We identified 38 imprinted genes, most of which showed no difference in expression after in vitro culture compared to the in vivo embryos. Five genes showed a statistical difference compared to the in vivo control, depending ...

Possible birthplace of malignant brain tumors identified

... in the stem cells to regulate their production of mature brain cells. The researchers located the PDGFRá-co... the stem cells to halt their normal production of mature brain cells and launch into the abnormal proliferation pathway. Importantly, the researchers found t...

A dichotomy in migration patterns found for sea turtles in east Atlantic

...ements and diving patterns--show that the sexually mature adult population also includes oceanic animals and thereby reveal that adults in the eastern Atlantic occupy very different habitats and undertake two distinct foraging strategies. The differing strategies correlate with body size, which may be lin...

Injection may prevent infertility in men receiving cancer chemotherapy

...y been injected with AS101, and we could also find mature sperm. Injection of AS101 alone did not alter testicular weight or tissue analysis results. "These results hold out much promise for fertility preservation in men undergoing cancer treatments", he said. "We now intend to study the mechanism of pr...

New egg freezing technique offers hope to hundreds of women

...e since the early 1980s, while cryopreservation of mature oocytes has proved to be very difficult. Current techniques for freezing oocytes have a very low success rates in terms of viable pregnancies per frozen oocyte. This is probably due to basic biological differences between oocytes and sperm cells and ...

Life and death in the hippocampus: what young neurons need to survive

...hey can muscle their way into networks occupied by mature neurons. Neuroscientists at the Salk Institute for...A receptor-mediated event is a competition between mature cells vying for connectivity and young guys competing with both the mature cells and their peers to ...

T cells activated to fight HIV basis for dendritic cell therapeutic vaccine

... the researchers coaxed them to differentiate into mature dendritic cells, and they were grown in culture with the addition of various substances to boost their potency. Separately, the researchers combined a small amount of the patient's HIV with their CD4 cells, in order to "super infect" them. In these n...

Researchers offer clues to how leaves patterns are formed

...howed that the leaves with the dotted veins were a mature version and that at an earlier stage, the veins were continuous and did act as transporters. "We didn't have the technology to see those early stages before and now we do," he said. "We now know that the veins are the backbone of the leaf and are som...

New study reveals signaling pathways required for expansion of pancreas stem cells

...ancreas and prevent them from differentiating into mature insulin-producing cells and, at the same time, cause them to proliferate. "Interestingly, the expression of Id proteins is induced by bone morphogenetic proteins (BMPs) targets in another cell type," says Sarvetnick. "We wanted to know whether BMP ...

Sperm created in the laboratory from embryonic stem cells produce viable progeny

...germ cells that then give rise to cells resembling mature egg and sperm cells, known as gametes. However, th...colleagues developed a new strategy for generating mature sperm cells in the laboratory using ES cells from mice and went on to test the functionality of the ...

Prozac's target revealed

...tep in the neurogenesis pathway from stem cells to mature neurons. (Illustration available on request) The study is published in the published in the Proceedings of the National Academy of Sciences (advance on-line this week, in print on May 23). It was led by Grigori Enikolopov and spearheaded by postdoct...

New research finds surveys of larval-stage organisms effective for measuring marine biodiversity

...atopod larvae to a sequence database of most known mature species of mantis shrimp. The comparisons revealed...lect larvae for sampling since the habitats of the mature marine species can be totally unreachable," said Barber. "This method gives us a better idea of how ...

New technology addresses female fertility preservation

... can be preserved at any time but are difficult to mature when removed from their normal environment. A tea...tes follicles and allows immature eggs to grow and mature in vitro. (A follicle is a small spherical group of specialized support cells surrounding each egg.)...

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