Tag: "egg" at biology news

Cytoplasm affects the number of vertebrae in carp-goldfish clones

...n offspring, cloned from nuclei of common carp and egg cytoplasm of goldfish, were virtually identical to...my of Sciences, in Wuhan, China, conclude that the egg cytoplasm, and not the genetic code of the transplanted nucleus, influenced this aspect of the skele...

Researchers reveal the infectious impact of salmon farms on wild salmon

...ys Krkosek. "Some of these fish are so young their egg sacks haven't been fully absorbed ?even fish this small are infected." The anchored farms, open cages of closely packed salmon, are aquatic feedlots providing the ideal conditions for the breeding and spread of sea lice amongst the adult fish. For t...

Needling Chromosomes Reveals Cell Division Secret

...mitosis, as well as the proliferation of sperm and egg cellscalled meiosis."Chromosomes in mitosis and meiosis have to be held together, becauseotherwise they don’t attach to the apparatus called the spindle thatdistributes them to opposite poles," explained Nicklas, who is aResearch Professor of Biology...

Influenza vaccine uses insect cells to speed development

...njected into the fluid surrounding the embryo. The egg is then resealed, the embryo becomes infected, and the resulting virus is then harvested, purified and used to produce the vaccine. In addition to the long development time, another drawback to this method is the possibility that an avian influenza v...

First frozen egg baby born in Canada

...eezing technique, which has dramatically increased egg survival rate. Human eggs are very fragile and hav...ice crystals, damaging the cells and rendering the egg unusable. This problem has now been resolved by a new method of rapid freezing called vitrification ...

Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment

... worked well because the cells are large. When the egg is thawed, ice crystals cause damage that prevents the egg from being fertilized. U-M researchers looked beyond traditional techniques to a method of freezing...

Of mice and men's (and women's) contraceptives

... protein causes problems in the timing of sperm or egg development. We're working hard on understanding this mechanism." A similar human equivalent of MSY2, Contrin, has been identified by the research group and their studies indicate it is also a germ cell-specific protein. Using MSY2 as a mouse model,...

Retrovirus struck ancestors of chimpanzees and gorillas millions of years ago, but did not affect ancestral humans

... invaded the genome in the germline -- in sperm or egg cells -- allowing the sequence to be passed on to future generations. In those animals in which the virus was taken up next to or inside a gene -- in the part of the genome that codes for the most important biological functions -- the virus had an ev...

Mother birds increase progesterone to hatch females

...ly manipulate the sex of their offspring before an egg is laid," says Stephanie Correa, a doctoral student in neurobiology and behavior at Cornell and the lead author of the study that was posted online recently in The Royal Society's Biology Letters (Vol. 1, 2005). "Most investigators have looked primar...

Human Eggs Can Develop From Ovarian Surface Cells In Vitro

...ong two developmental pathways and becoming either egg or granulosa cells. The authors speculate that this bipotent differentiation may represent a sophisticated mechanism created during the evolution of female reproduction, and not seen in ovaries of female prosimians (ancestral primates) or mice carryi...

Stem cells in bone marrow replenish mouse ovaries

...od of mice can "restock" a depleted ovary with new egg cells within weeks, according to new research publ...in reproductive biology, that female mice generate egg cells only during fetal development and thus are born with a finite stock of eggs that declines thro...

A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs

...gs are about to make a life-or-death decision. The egg clutch, a gelatinous blob clinging to a leaf overh... to take another morsel, the embryos rupture their egg capsules, drop into the water, and, as tadpoles, swim away to safety -- hatching one to three days e...

Scripps research scientists identify infertility molecule

...able to fertilize the egg. Finally, the fertilized egg must become a viable embryo and implant in the ute...men who are attempting pregnancy because a woman's egg production decreases with age, especially after the age of 35. Often, women will undergo treatments...

First production of human monoclonal antibodies in chicken eggs published in Nature Biotechnology

...d solely in the chicken oviduct and deposited into egg white in concentrations of 1-3 milligrams per egg....regulatory sequences restricting its deposition to egg white. The stem cells were then introduced into chick embryos. At this stage of development, the emb...

Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

...lls the environment of the developing follicle for egg development or the tissue of the testis for sperm....e to cells that produce the hormones for sperm and egg development and isolate these as well. What is extraordinary is that the embryoid bodies seem to pro...

Multi-species genome comparison sheds new light on evolutionary processes, cancer mutations

...t in terms of evolution. When chromosomes break in egg or sperm cells, opportunities arise for the rearrangement of DNA in the resulting offspring. Such inheritable rearrangements may be lethal or cause disease. However, in some cases, the breaks may lead to the production of new or altered proteins with...

Orientation and the egg

...ture experiments on the premise that the mammalian egg neither has nor requires predetermination for successful development," explains Dr. Hiiragi. ...

New Discovery May Help Doctors Treat Infertility

... beta estrogen receptor plays a role in moving the egg outside the ovary so it can be fertilized,?said Kenneth Korach, Ph.D., Laboratory Chief at the National Institute of Environmental Health Sciences (NIEHS) where the research was conducted. “We never knew before what function this receptor played in r...

What comes first…the chicken, the egg, or the bad attitude?

...ductive hens that "partition" nutrients needed for egg production into their own bodies. "They like to be...their nutrients from the growth of their bodies to egg production, but some of them don't do it very willingly. It is not a conscious thing the bird does, ...

Discovery suggests why stem cells run through stop signs

...from the fruit flies' ovaries and studied how many egg chambers the mutant stem cells produced as compared to normal stem cells. The production rate in the mutant cells fell over the course of 12 days, and the researchers concluded it was because the mutant stem cells were no longer dividing. Without th...

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