Tag: "eggs" at biology news
Don't stand so close to me: A new view on how species coexist
...d wasps, insects that kill other insects by laying eggs
in them, account for a fifth of all known multi-celled species. Their 200,000 species places them approximately next to land plants in terms of diversity. To their surprise they found that over long periods of time, 'gaps', or differences in their li...
Marine Biological Laboratory summer investigator wins Nobel Prize in Chemistry
...lins and the cell cycle in the test tube using the eggs
of local surf clams as models. It turned out to be...dying that ubiquitin ligating complex in both clam eggs
and cultured human cells in hopes of learning even more about cell division in general and cancer mo...
'Junk' DNA may be very valuable to embryos
...on events orchestrating the changes when mammalian eggs
are fertilized and become embryos. Researchers have discovered that expression of genes in mouse eggs
and very early embryos is activated in part by regions of DNA called retrotransposons, which may hav...
Babies born after surgery on eggs
...tors performed a kind of transplant surgery on the eggs
of their mothers, for whom normal IVF had failed. ...itochondria from the granulosa cells that surround eggs
and inject around 3000 into each egg. This addition has a dramatic effect. In a group of women for w...
New Royal Society journal studies
...ation and genetic method, we evaluated the fate of eggs
by workers in colonies of a paper wasp. Our results showed that the workers produced eggs
according to the theory while they also removed nestmate-workers' eggs
contradicting the theory. Con...
The blotchier the face, the better the wasp
...he winner, the top or alpha wasp, gets to lay more eggs
and do less work than the other wasps. To see whether they could detect what signaled an alpha wasp, Tibbetts and Dale decided to stage wasp fights. She captured wild wasps and brought them back to the lab. There she paired up wasps of equal weight, ...
A puzzle posed by black-headed ducks yields to persistent biologists
... nests and raising their own young, they lay their eggs
in the nests of other species and let those birds ...wbirds. Instead, they found that black-headed duck eggs
are often rejected from host nests, and it took four years of detailed field research to figure out ...
Scientists discover key egg enzyme for blocking sperm entry after fertilization
... Peroxidase activity has been identified in the eggs
of many other species during fertilization, and ev... to take this result from sea urchins, who produce eggs
that are easy to obtain and to study, and apply it more broadly," says the lead author on the study,...
Free radicals and fertilization: Study reveals egg protection secret
... that produces hydrogen peroxide in the fertilized eggs
of sea urchins. This infection-fighting free radic...completely different ways." Wessel said that human eggs
also create a barrier against polyspermy after fertilization. While the production of peroxide in th...
Efforts to clone primates move forward
...sburgh researchers performed nuclear transfer with eggs
that had not yet achieved full maturity. Cells pre...ent of chromosomes. In other animal cloning work, eggs
had been enucleated at metaphase II, part of the second stage of meiosis. Once the maternal genetic ...
Draft sequence of chicken genome completed
...is of this genome is not just about getting bigger eggs
and tastier chicken it's giving scientists surprising insights into the human genome. Researchers can use these new data as a tool to identify similar sequences in humans regions previously thought to be 'junk' DNA in the human. These sequences mus...
NC State gets $1.59M grant to map genome of parasitic worm
...then become sedentary and produce as many as 1,000 eggs
in 30 days, which will hatch and re-infect the roots. So you can have multiple generations infecting plants in one season," Opperman says. Above ground, infected plants will show stunted growth or become yellowed or wilted. The root-knot nematode do...
Chicken genome analysis will benefit human health and agriculture
...ry producers to know why certain chickens lay more eggs
than others or why certain broiler chickens may have less fat. They then can identify commercial chickens with the same genetic predisposition to these desirable traits. "If we know the genes that influence these traits, we can select chickens that ...
Unusual reproductive behavior of odd ants surprises scientists
...usually in short supply, and a queen produces male eggs
only when it's time to make more colonies. Then a queen produces eggs
that give rise to both males and queens (reproductive females). The males and new queens swarm out o...
Clam embryo study shows pollutant mixture adversely affects nerve cell development
... Reinisch and her colleagues collected surf clam eggs
and sperm, fertilized them in vitro, and added BCE to normally developing clam embryos. The investigators used a combination of antibodies and dyes to show the presence of neurotransmitters in single neurons. "We've actually taken superlative three-d...
Big, old fish key to restoring groundfish stocks
... healthy marine fish stocks the larvae from their eggs
better resist starvation and have a much greater c...o have numerous smaller females to produce as many eggs
as one larger fish," said Mark Hixon, an OSU professor of zoology. "Modern fish management is based ...
Evolution of classical polyandry: three steps to female emancipation
...les to develop. Firstly, males take on care of the eggs
(the reasons why differ between fishes and birds). Secondly, females become able to lay more eggs
than a male can accommodate. Thirdly, females compete with each other to lay clutches for several m...
Why attractive (but costly) males get the girls
...ese females produced both daughters that laid more eggs
within a given time and sons that were more attractive. The benefit stems in large part, the authors argue, from siring "sexy" sons. Thus, by evaluating both the direct effects of mating on female lifetime fecundity and the indirect effects of offspr...
Researchers find local environment directly influences adult stem cell reservoirs
...daughter cell acts like a stem cell and the future eggs
are lost. "That stem cells are maintained by blocking gene expression suggests that the microenvironment, or niche, captures the cells and prevents them from differentiating," Dr. McKearin said. "Cells that are poised to differentiate do not, simply ...
Theory on evolution of essential genes is overturned by new finding
...hers that plays a vital role in helping fertilised eggs
to develop into adults has helped scientists overturn the idea that essential genes have always been part of the genetic makeup of a species. The research, published in the journal Current Biology tomorrow (26 January 2005), shows that an essential...
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