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Tag: "eggs" at biology news

Oldest animal fossils may have been bacteria

The oldest-known animal eggs and embryos, whose first pictures made the cover o... known as phosphorite. The fossils identified as eggs and embryos in 1998 came from southern China's Doushantuo Formation, which is rich in phosphorite. ...

Honey bee genome holds clues to social behavior

...n the hive when they are young, such as caring for eggs and larvae, and then shift to foraging for nectar and pollen as they age. However, if the hive has a shortage of foragers, some of the young nurse bees will switch jobs and become foragers. The job transition, whether triggered by age or social cue...

A human taste for rarity spells disaster for endangered species

The shady pursuit of endangered bird eggs made international headlines in May 2006 when Colin Watson, widely considered Britain's most notorious illegal egg collector, died after falling from a 12-meter tree, allegedly while hunting a rare egg. The Royal Society for the Protection of Birds e...

Mother birds give a nutritional leg up to chicks with unattractive fathers

... the embryo during the developmental process, into eggs sired by less attractive fathers. "For female bi...ght red to drab yellow. The researchers found that eggs sired by unattractive males (those with less brilliant feathers) had more total antioxidants, includ...

Bacterial protein shows promise in treating intestinal parasites

...ult parasites, as well as impairs the excretion of eggs by female worms. Hookworms cause anemia by attaching to the intestine and feeding on their host's blood and nutrients, causing anemia and weight loss. The researchers said in their paper that because this naturally-produced protein is safe to huma...

Fire ant-attacking fly spreading rapidly in Texas

... return the ants to their property carrying phorid eggs inside them. "People accidentally move fire ants around all the time," says Gilbert, "and now they can help speed up the spread of phorid flies on purpose by moving ants containing phorid eggs." The new flytraps will help BFL researchers identif...

Researchers report technique for freezing and preserving genetically enhanced pig embryos

...embryos by first removing lipids from unfertilized eggs before fertilizing them with muscle cells from a male pig containing modified genetic material. The resulting embryos were then frozen at the blastocyst stage. Upon thawing, embryos were transferred to surrogate female swine. Embryos placed in the o...

What controls stickiness of 'smart' chromosomal glue

... of the process cells use to ensure that sperm and eggs begin life with exactly one copy of each chromosom...ized cell division process that produces sperm and eggs ?enabling them to separate properly. The researchers, led by Howard Hughes Medical Institute inves...

RNA found in the cellular centrosome of surf clams

...bundant marine organisms like surf clams and their eggs as research models. Clam eggs are modeled as simple versions of human cells, and biologists who study cell division value them for...

Female birds boost up their eggs when hearing sexy song

...s show that female songbirds can alter the size of eggs and possibly the sex of their chicks according to ...s started egg-laying they varied the size of their eggs in the nest according to the attractiveness of the male's song. That is, the more attractive the son...

Origen publishes in Nature a robust and versatile method for creating transgenic chickens

...infrastructure for rearing chickens and processing eggs means that therapeutic proteins can now be produced efficiently and economically in the eggs of chickens." Origen scientists first demonstrated the potential for the production of human protei...

Fertility hope as study shows eggs survive in older ovaries

...ers speculated that mice could continue to produce eggs throughout puberty and adulthood. Although their s...) develop within ovarian follicles. In humans, the eggs are believed to die off from late in foetal life, after birth and into adult life. When egg numbers ...

New technology addresses female fertility preservation

...em that encapsulates follicles and allows immature eggs to grow and mature in vitro. (A follicle is a smal...eviously developed methods of growing follicles or eggs outside of the body do not provide the three-dimensional support to maintain the follicle structure ...

All the eggs in one basket

...e only way to avoid the risk of putting all turtle eggs in a very few baskets." Conservation implications of historic sea turtle nesting beach lossLoren McClenachan, Jeremy Jackson and Marah Newman (Scripps Institution of Oceanography)Frontiers in Ecology and the Environment 2006; 4(6): 290-296 ...

Major initiative proposed to address amphibian crisis

...er, have no protective hair or feathers, and their eggs have no hard outer shell," Blaustein said. "So it's clear why they may be vulnerable on some levels. However, they persisted for hundreds of millions of years and just now are disappearing in many areas." Some of the causes have been identified. R...

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

...asmic injection of the ES-derived sperm into mouse eggs resulted in successful fertilization and the resul...ratory which can be used to successfully fertilize eggs and support full-term development into embryos and adult mice. "Our approach provides an accessible ...

Arctic expedition will investigate alien-like glacier

...ed the site and noticed the strong smell of rotten eggs that indicated the presence of sulfur. Grasby then visited the in 1999 and 2001 and collected samples of the water and mineral deposits from the spring, which contained new forms of bacteria and an extremely rare mineral known as vaterite. Sulfur-lo...

Plants tell caterpillars when it's safe to forage

...ps ( Cotesia marginiventris ), which deposit their eggs in the larvae. Production of volatile chemicals increases during the day (when wasps are active) and decreases at night, suggesting that variations in production might affect the daily activity patterns of foraging larvae, with low production sending...

With few factors, adult cells take on character of embryonic stem cells

...Those findings provided evidence that unfertilized eggs and embryonic stem cells contain factors that can confer pluripotency to differentiated cells, Yamanaka said. "We hypothesized that the factors that play important roles in the maintenance of embryonic stem cell identity also play pivotal roles in ...

New egg freezing technique offers hope to hundreds of women

...new and highly successful method of freezing human eggs will help to even out the current inequality betwe...f success, the freeze-thawing process could damage eggs and, until now, it had been very difficult to perform successful IVF using frozen-thawed eggs. Resea...

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