Tag: "egg" at biology news
A unique arrangement for egg cell division
...decided very early on during the maturation of the egg
cell in the ovary. In a cell division process that is unique to egg
cells, half of the chromosomes are eliminated from the egg
before it is fertilised. Using a powerful...
Scientists prove that disputed Korean stem cell line comes from an unfertilized egg and not cloning
...om embryos that are created when the nucleus of an egg
is replaced by the nucleus from a body cell. Creation of human ntES are pES are of particular interest to researchers as they may provide stem cells that are nearly genetically identical to the donor and, therefore, particularly well suited for custo...
Discredited Korean embryonic stem cells' true origins revealed
...em cell line was actually derived from the woman's egg
alone," Daley says. The Koreans' 2004 paper, pub...cell nuclear transfer (replacing the nucleus of an egg
with the nucleus from a cell in the body). They also tested three human embryonic stem cells isolate...
First case of successful ovarian tissue transplantation between two, nonidentical sisters
...ation and considered that it was more natural than egg
donation, for which her sister would have to undergo ovarian stimulation with follicle stimulating hormones and then oocyte retrieval. In addition, her sister had asked expressly to be the tissue donor and had refused to undergo ovarian stimulation f...
MGH researchers confirm that bone marrow restores fertility in female mice
...s-yet unidentified mechanism. While donor-derived egg
cells or oocytes were observed in the ovaries of m...oat color of any pups would indicate the source of egg
cells used to make the offspring, with tan coats signifying eggs from the recipients and black coats...
Researchers find pathway that controls cell size and division
...cific cell types: a tiny sperm versus a gargantuan egg
for example. In single-celled organisms such as yeast and bacteria nutrient availability is the primary determinant of cell size. In animal cells size is controlled in large part by a molecule that senses the blood sugar dependent hormone insulin. ...
Smithsonian's National Zoo researchers use electronic eggs to help save threatened species
...g to preserve the species, thanks to an electronic egg
that transmits real-time incubation data from the ...tectors record how frequently the mother turns the egg
during incubation. The data are recorded 24 hours a day and downloaded to a computer every 48 hours....
Cloning the male genome may help infertile men
...injected a single healthy mouse sperm into a mouse egg
from which the nucleus had been removed, and by do...analysed. The resulting cells were fused with an egg
that had been previously chemically activated. The cells so derived had chromosomes from both pare...
First baby is born after oocytes were matured in the lab and frozen
Lyon, France: The first baby to be created from an egg
that had been matured in the laboratory, frozen, thawed and then fertilised, has been born in Canada. Three other women are pregnant by the same process. The research was presented to the 23rd annual meeting of the European Society of Human Reproduct...
New method for reading DNA sheds light on basis of cell identity
As a fertilized egg
develops into a full grown adult, mammalian cells make many crucial decisions closing doors of opportunity as they adopt careers as liver cells, skin cells, or neurons. One of the most fundamental mysteries in biomedicine is how cells make such diff...
Extracting eggs from pre-pubertal cancer patients brings hope for future fertility
...lieve that no younger patients have ever undergone egg
collection, in vitro maturation, and egg
freezing. We are hopeful that the mature eggs can offer these girls a realistic possibility of pre...
Wood ant queen has no egg-laying monopoly
...Finland, investigated worker ovary development and egg
laying in nine Northern European wood ant species ...pped to lay eggs. Furthermore, genetic analysis of egg
parentage showed that these workers are really laying eggs on a large scale. For example in the spec...
Frog molecule could provide drug treatment for brain tumors
A synthetic version of a molecule found in the egg
cells of the Northern Leopard frog (Rana pipiens) could provide the world with the first drug treatment for brain tumours. Known as Amphinase, the molecule recognises the sugary coating found on a tumour cell and binds to its surface before invadin...
Gannet population under threat from global warming
...st each year. It takes forty days for an incubated egg
to hatch and a further ninety days for chicks to fledge. Theres only time for each gannet pairing to raise one chick each year, so with an increasing number losing their chicks and their nesting sites we may start to see a decline in overall numbers,...
Changes in chromosomal constitution of preimplantation embryos suggest caution in genetic screening
...erent assisted reproduction technique, for example egg
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 ragg...
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 mal...
Physicist cracks women's random but always lucky choice of X chromosome
...ly stage in the development of a womans 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, s...
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....
Now playing -- Cell migration LIVE!
...cells that literally crawl across the length of an egg
chamber while it is maturing, says Denise Montell,...urns as the leader during their journey across the egg
chamber. Another discovery is that a protein called Kuzbanian is necessary to help border cells deta...
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