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Tag: "eggs" at biology news

Study of planarians offers insight into germ cell development

...subject for the study of germ cells, precursors of eggs and sperm in all sexually reproducing species. The planarian Newmark studies, Schmidtea mediterranea, is a tiny creature with a lot of interesting traits. Cut it in two (lengthwise or crosswise) and each piece will regenerate a new planarian, comp...

Mitochondrial genes move to the nucleus -- but it's not for the sex

...rtner genes in the nucleus -- in the production of eggs or pollen, via meiosis. But the mating system determines whether or not this separation is permanent. With self-pollination, the components separated by meiosis are brought back together. In contrast, the components are further separated if they mix ...

Motor protein plays key role in connecting neurons

...de rapidly, such as skin and intestinal cells, and eggs or oocytes. The rapidly moving protein is easily degraded and needs tight regulation. "If you don't want to have dramatic changes in your neuron structure, you don't want this molecule," she says. In fact, she suspects the function of my...

Study finds mercury prevalent in many western fish

... They may not clean their young, or they may leave eggs unattended in their nests. "We simply haven't done enough studies to know all of the impacts, especially on fish-eating animals," Hughes added. The study, based on data collected from EPA's Environmental Monitoring and Assessment Program, encomp...

How fish conquered the ocean

...ating their yolk-producing genes and filling their eggs with the water of life ?the degradation of yolk pr...oteins from one of the duplicated genes causes the eggs to fill with vital water and float. This is the major solution realized by extant marine teleosts th...

US conservation efforts bring more marine turtles to UK

...riven by the North Atlantic current system. The eggs of Kemp’s ridley turtles were harvested in huge numbers and the species reached near-extinction before protective measures began in the mid-1960s. Previously absent in UK waters since 1974, sightings of this species returned in the 1990s, which coinc...

Researcher examines polymers created with poultry feathers

...ricultural byproducts such as poultry feathers and eggs that would be comparable to petroleum-based plasti...or agricultural waste, such as poultry feathers or eggs that don't pass inspection. These agricultural wastes currently find uses in low-value animal feed o...

Cloned mice created from fully differentiated cells, a milestone in cloning research

...s is highly inefficient. Even if the reconstructed eggs survive to the blastocyst stage, only a handful, at most, of these result in live young when implanted into a female. Many have attributed cloning's limited success to a theory that clones must be derived from adult stem cells, which reside in a spe...

Stem cells engage in dialogue with the cells that regulate their futures

...es, as a model system. The production of fruit fly eggs depends on the presence of a renewable source of s...ns two to three stem cells preparing to become fly eggs that are cuddled in a niche composed of three to six cap cells. Cap cells adhere to stem cells and t...

Cracking the egg

...hat 80% of the expressed genes identified in mouse eggs are also expressed in the eggs of two other organisms previously studied, a frog and a sea squirt. Obviously early development is a...

New clues to how sex evolves

...ates and then divides twice, resulting in sperm or eggs with just one set of chromosomes each. For meiosis to work properly, corresponding chromosomes must first identify each other, then line up accurately and stay together during the recombination process. Different organisms use different methods for t...

Why do some queen bees eat their worker bee's eggs?

... who although unable to mate, can lay unfertilized eggs which turn into males if reared. For some species,...the honeybee, workers "police" each other ?killing eggs laid by workers or confronting egg-laying workers. In 1964 the English biologist William Hamilton...

Scientists crack genetic secrets of human egg

...ntroversial. This work used onlyunfertilized human eggs that were obtained from women seeking fertility tr... donors granted informed consent for their surplus eggs to be used for this research. Cibelli worked with researchers in Chile to extract the RNA from the...

Virus may control Australia's

...weight and each female can lay up to three million eggs in a single season," Dr Crane says. "In some areas of south-eastern Australia carp make up more than 85 per cent of the fish in the rivers and creeks. "The virus works by attacking the carp's gills as well as other vital organs and eventually killin...

Some butterflies travel farther, reproduce faster

...ty varies quite a lot among females, who carry the eggs and establish new populations. For those reasons, ...dual butterflies to determine the number of mature eggs they carried. "The females from the new patches develop very quickly," Fescemyer said. They develo...

Climate change creates dramatic decline in red-winged black bird population

...end of the season lasting longer, when more female eggs typically hatch, so that shift has affected the population sex ratio." Over the years, Weatherhead's team has put bands on the legs of thousands of red-winged black birds in order to track their nesting habits. They winter in southeastern United S...

Researchers create genetically matched embryonic stem cells for transplantation

... Boston report a new and efficient strategy, using eggs alone, for creating mouse embryonic stem cells tha...rk establishes the principle of using unfertilized eggs as a source of customized embryonic stem cells that are genetically matched to the egg donor at the ...

New moth variety disarms plants guarded by selenium

...ted varieties, was not deterred from either laying eggs or feeding on the plant. Furthermore, the researchers found that a selenium-tolerant wasp (Diadegma insulare) in turn parasitizes the selenium-tolerant diamondback moth. Chemical analysis showed that the selenium-tolerant moth and its parasite bo...

Pilot study successful in taming allergic reactions to food

Children who were allergic to eggs were able to essentially overcome their allergy by gradually consuming increased quantities of eggs over time, researchers at Duke University Medical Center and the University of Arkansas for Medical ...

'Nymph of the sea' reveals remarkable brood

...ered the mother complete with her brood of some 20 eggs and 2 possible juveniles inside, together with oth...rare. "Supposed examples of fossil invertebrate eggs are also few. The fossil we have found contains soft-part anatomy such as legs and eyes and also inc...

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