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Tag: "egg" at biology news

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

...ive cell ?and transferring it into an unfertilized egg that has had its chromosomes removed. Because the resulting new embryo contains the entire genome of the donor somatic cell it is an identical copy. This cloned embryo is then implanted into a surrogate mother, and, if the process is successful, is c...

Huddling and a drop in metabolism allow penguins to survive the South Pole cold

...rect conflict with the requirements for successful egg incubation. Therefore, energy savings accrued from...perature drop of 0.5°C during huddling. In case of egg loss, body temperature continued to decrease to 35.5°C, with a further 0.9°C decrease during huddlin...

NYU scientists identify how development of different species uses same genes with distinct features

... show that it takes several mRNAs localized in the egg to achieve the same functions in wasps as bicoid does in flies. Two of these genes, which are found in most species of insects, are orthodenticle. Orthodenticle performs the anterior promoting function of bicoid while anterior localization of giant m...

How fish conquered the ocean

...pects of the physiological adaptations of the fish egg to the marine environment. It is most satisfying t...al stages of oogenesis, a period that prepares the egg for spawning and fertilization. They show that teleost vitellogenins have undergone a post-R3 lineag...

Baby fish 'smell their way home'

...at it is imprinted on them either when they are an egg inside their mothers, a fertilised egg swept around on the bottom, or new-hatched fry loose in the stream or brooded in their parents' mout...

Living with water scarcity -- world must act now

...pled over the last 30 years, and in India milk and egg products are becoming increasingly popular ?meaning an accelerated demand for more water to grow more food. Growing cities take more water, and environmental concerns are rising. A water-food-environment dilemma. Water use in agriculture is re...

Penn researchers replace organ in adult mice using 'single-parent' stem cells

... has approached the possibility of using a woman's egg cells to create therapeutic stem cells, we discovered that we could actually repopulate an adult organ. To our surprise we also found that by using male-only derived embryonic stem cells, we could do the same," McLaughlin said. "In humans, this cou...

Biologists prove critical step in membrane fusion

...collaborators discovered that the membranes of the egg and the vesicles are hemifused ?a state where the ...l Cell. "When using the right cell ?the sea urchin egg ?the phenomenon is observable." "What we’ve found here with membrane fusion is that everything is...

Scientists discover stage at which an embryonic cell is fated to become a stem cell

... which some of the cells of a fertilised mammalian egg are fated to develop into stem cells and why this occurs. The findings of the study, which overturn the long-held belief that cells are the same until the fourth cleavage (division) of the embryo, are reported in today's edition of Nature. After f...

ATR checkpoint-activating DNA structure

...responses in unprecedented ways." Using Xenopus egg extracts as a cell-free system, the researchers found that single-stranded DNA annealed with primers specifically triggers the ATR-mediated checkpoint response. While many proteins involved in the DNA damage response have been uncovered, this type of...

In-shell vaccine for chick disease

...vet UK. It can be delivered to chicks still in the egg (in-ovo) using robotic 'vaccinators'. IBV is t...to severe respiratory disease, dramatically reduce egg production and affect the quality and hatchability of eggs. The researchers, funded by the Biotec...

Researchers find gene mutation that causes infertility in male mice

...ed in meiosis, the process that produces sperm and egg cells for reproduction. These sex cells contain on...le mice with the Dmc1 mutation are born with fewer egg cells and can run out of eggs prematurely -- resulting in early menopause (or "mousapause" as the re...

Bypassing eggs, flu vaccine grown in insect cells shows promise

...e does work in the real world.? Freedom from the egg brings implications important to a world facing th...hundreds of millions of fertilized eggs, with each egg containing less than a teaspoonful of material that will ultimately become part of a vaccine. It’s t...

Cambodian vulture nests offer hope for species

...p 24-hour protection measures against poaching and egg collecting, and are now working with local communities to ensure that they are involved in—and support—longer-term conservation measures. "We already have a successful WCS model working in the Northern Plains where local people benefit from conservat...

Study investigates 'divorce' among Galapagos seabirds

...y raise one chick at a time. Parents incubate the egg for 43 days. Then, it takes another 100 to 120 days of parental care until the baby bird can fly. The parents will usually continue to provide some meals to the fledgling. So, if, when mating season rolls around again, a male looks a little rag...

Study shows lizard moms dress their children for success

...aturally occurring estradiol concentrations in the egg yolks. The researchers then performed experiments in breeding enclosures, each holding one male lizard and three females. The numbers of orange- and yellow-throated females in each enclosure were experimentally varied, and throat colors of the ma...

Physicist cracks women's random but always lucky choice of X chromosome

...y stage in the development of a woman’s fertilised egg the cells need to silence one of those two X chromosomes. This process is crucial to survival and problems with the process are related to serious genetic diseases. Both X chromosomes in a cell have a suicide gene called XIST which, if activated, ...

Undergraduate research shows leaderless honeybee organizing

... her behavior -- reducing her food intake, slowing egg laying and becoming more active. At this point, th...research shows a picture of the queen as a passive egg layer whose own behavior is programmed, with changes dictated by signals delivered by older workers....

Studies to find better ways to preserve human eggs, ovarian tissue under way

...ple who are going through cancer therapy is to use egg donors later on,” says Dr. Adelina M. Emmi, reprod... But, for more complex structures, such as a human egg or ovarian tissue, resulting ice formation can be destructive. “Ice crystals break up your inside or...

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