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Tag: "eggs" at biology news

Alien woodwasp, threat to US pine trees, found in N.Y.

... spores of a toxic fungus when the female lays her eggs through the bark and into the sapwood of the tree. "If S. noctilio is found to be established in New York or elsewhere in the U.S., we could launch a rapid response to contain and control the infestation," says Hoebeke. A biological control method u...

Human Eggs Can Develop From Ovarian Surface Cells In Vitro

Research has shown for the first time that human eggs may develop directly from cultured ovarian surface...ulture of OSE cells developed in vitro into mature eggs suitable for fertilization and development into an embryo. These findings, published today in the Op...

Internet viruses help ecologists control invasive species

...as been facilitated because it can produce resting eggs able to survive adverse environmental conditions (...g eaten by fish), and because humans transport the eggs on their fishing gear and pleasure boats. Professor Norman Yan of Ontario's York University has dem...

NHGRI targets 12 more organisms for genome sequencing

...the genetic model for parasitoids, which lay their eggs on and kill arthropods, thus controlling pest populations. In the United States, the use of parasitoid wasps in agriculture as a biological control of crop damaging insects saves approximately $20 billion annually. The wasp will serve as a good compa...

Mother birds increase progesterone to hatch females

...molecular methods used to determine the sex of the eggs has only recently been made available. ...

SuperLigands - a database of ligand structures derived from the Protein Data Bank

... have a parthenogenetic origin, where unfertilized eggs can divide on their own. Hwang and colleagues report that the cells are chromosomally normal, self-renewing and "pluripotent" ?meaning they have the ability to form the three major types of cells in the early embryo that give rise to all other cells...

Scientists generate patient-specific stem cells, Science study says

... have a parthenogenetic origin, where unfertilized eggs can divide on their own. Hwang and colleagues report that the cells are chromosomally normal, self-renewing and "pluripotent" ?meaning they have the ability to form the three major types of cells in the early embryo that give rise to all other cells...

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

...e group of cells that give rise to either sperm or eggs in animals, as opposed to all other cell types, wh...o functional sperm, and females show early loss of eggs and defects in ovulation. The MSY2 protein is part of a family of proteins, called Y-box proteins, ...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...nly 6 inches long ?that is, he's able to fertilize eggs at even that diminutive size, says Thomas P. Quinn...Small males, however, can sometimes fertilize many eggs by sneaking rather than by fighting," Quinn says in the chapter called, "Downstream Migration: To Se...

Double triumph in stem cell quest

... The process was also very inefficient, taking 242 eggs to create just one ESC line. Now Hwang has create...the process: the 11 lines came from just 185 fresh eggs donated by 18 unpaid volunteers, meaning an average of only 17 eggs was needed per ESC line (Science...

Aggressive aquatic species invading Great Lakes

... Previous research has shown that round gobies eat eggs and young of various native species. Scientists believe that gobies have contributed to or caused the extinction of some native species in Lake Erie, the first lake to be invaded. "Obviously people are concerned about the effects on native species in...

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

...rehensive Cancer Center have found. By having her eggs frozen before she begins cancer treatments, a woma...serve the hope of one day having a baby. Freezing eggs is one thing; thawing them safely so they can lead to pregnancy is the challenge. In the past, effor...

First frozen egg baby born in Canada

...al pregnancy. As an alternative treatment, she had eggs collected from her ovaries, which were then frozen...trogen at ?96ºC. After a period of two months, the eggs were thawed and fertilized with her partner's sperm through in-vitro fertilization (IVF) and intracy...

Glow-in-the-dark zebrafish at UH hold keys to biological clocks

...ield such a high output of spawn, with hundreds of eggs being laid by each female per week. This gives the scientists a better chance of identifying mutant fish whose biological clocks run fast or slow, providing the ability to trace the specific genes that create the anomaly. Putting UH a bit ahead of ot...

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

...e nesters, such as gulls and terns, that lay their eggs on the ground; burrow nesters, such as puffins, that dig burrows in the soil for their nests; and crevice nesters, such as auklets, that nest in boulder piles and rock crevices. According to Byrd, surface nesters and burrow nesters tended to disappe...

Amino acids in nectar enhance butterfly fecundity: A long awaited link

...al, nitrogen poor larval food conditions laid more eggs when fed nectar containing amino acids. These results provide the long missing evolutionary link between costly nectar amino acid production by plants, nectar preferences of and fitness benefits to butterflies. This article by Jovanne Mevi-Schütz an...

Study identifies predictors of HIV drug resistance in patients beginning triple therapy

...ns.Reinisch and her colleagues collected surf clam eggs and sperm,fertilized them in vitro, and added BCE to normally developing clamembryos. The investigators used a combination of antibodies and dyes toshow the presence of neurotransmitters in single neurons. "We'veactually taken superlative three-dimen...

Clam embryo study shows pollutant mixture adversely affects nerve cell development

...ns.Reinisch and her colleagues collected surf clam eggs and sperm,fertilized them in vitro, and added BCE to normally developing clamembryos. The investigators used a combination of antibodies and dyes toshow the presence of neurotransmitters in single neurons. "We'veactually taken superlative three-dimen...

Cytoplasm affects the number of vertebrae in carp-goldfish clones

... one genus of fish were transplanted to enucleated eggs of another genus of fish. The seven offspring, cloned from nuclei of common carp and egg cytoplasm of goldfish, were virtually identical to the nuclear donor species, Cyprinus carpio, in appearance and in most physical traits. The number of vertebra...

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