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Tag: "females" at biology news

Poor prenatal nutrition permanently damages function of insulin-producing cells in the pancreas

...bred or genetically altered in any way, they mated females with males, dating the day of their pregnancy, which lasts three weeks. They separated the mothers into two groups. The control group ate as much chow as they wanted during the entire pregnancy. The other group also was fully nourished during the fir...

Bird Brains Show How Trial and Error May Contribute to Learning

...h, which it performs repeatedly and intensely when females are listening. But occasionally, the finch might i...ermanently altered by LMAN stimulation and whether females prefer the stable or variable song version. ...

Falling ants glide back to trunk to avoid dangers of forest floor

...water-filled tree cavities and also collects adult females who've had a recent meal of blood ?his own. He and Dudley are applying for grants to do a more systematic survey to see how common gliding is among the hundreds of species of canopy ants as well as other insects that live in the trees, and to explor...

Love at first smell

...with body odour that is particularly attractive to females produce small protein fragments (known as "peptide... could be increased. In the experiment none of the females being tested could see the males. Even males previously rejected by females were rendered irresistib...

Sexual cooperation: Mating increases longevity in ant queens

...ife history of social insects; whereas most insect females undergo repeated phases of mating and reproduction throughout their lifetime, ant queens in social species mate only during a short period early in life and store and use the sperm of their mate for the rest of their lives. Sexual offspring are only ...

Bone Density Recovers After Teens Stop Injected Contraceptive

...ower bone density appears to recover in adolescent females once they stop using the injected contraceptive depot medroxyprogesterone acetate (DMPA), according to a study funded by the National Institute of Child Health and Human Development of the National Institutes of Health. Previous studies had shown th...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...mals, males have one X and one Y chromosome, while females have a pair of X's. Many genes on the male Y chro...suspected degree of expression heterogeneity among females in the population," Willard said. Further work is required to explore potential consequences of that...

Increased risk of osteoporosis associated with gene that one in five people have

...group of women. My guess is that we will find that females with this variant gene are breaking down estrogen rapidly from the day they are born. In that case, they would never achieve an adequate peak bone density and would lose even more bone mass after menopause. If we can catch them at an early age, we ca...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...ied inheritance in flowering pea plants, males and females should pass the t haplotype to half their offspring. In a strange twist to what Mendel might have predicted, the males pass the t haplotype to nearly 100 percent of their offspring (a phenomenon known as "transmission ratio distortion")-practically ...

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

...s related to the fact that reproductive success in females is linked to the ability to produce numerous large eggs, hence the need for the female to be of a certain size herself. "Small males, however, can sometimes fertilize many eggs by sneaking rather than by fighting," Quinn says in the chapter called, ...

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

...normal. Male mice produce no 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, that are present in most organisms, ranging from bacteria to humans. In the nuclei of developing germ cells, MSY2 enhances syn...

Symbiotic bacteria protect hunting wasps from fungal infestation

... in unique structures within its antennae and that females utilize these bacterial symbionts to protect the wasp larvae against pathogenic fungi. Detrimental microorganisms are a permanent threat to higher organisms, and because of their high reproductive potential and adaptability, they are extremely diffi...

Scientists generate patient-specific stem cells, Science study says

... match the nuclear DNA of patients, both males and females of various ages, suffering from disease or spinal ... from nuclear transfer with skin cells of males or females and oocytes from biologically-unrelated females. Other improvements over the last paper include the...

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

... match the nuclear DNA of patients, both males and females of various ages, suffering from disease or spinal ... from nuclear transfer with skin cells of males or females and oocytes from biologically-unrelated females. Other improvements over the last paper include the...

Important discovery about second most fatal cancer

...r features: # Early age at onset # More common in females # More common in right side of colon # Little evidence of tumour immunity # Frequent mutation of an oncogene called BRAF (also mutated in cancer of thyroid, ovary, and melanoma) # Frequent DNA methylation (chemical change which inactivates many genes...

Mother birds increase progesterone to hatch females

... biologists have been trying to figure out how the females of a few species, such as the Seychelles warbler, ...ely bias her offspring to female so that plenty of females from one generation will be available to help raise the next generation. Although the finding is no...

Radio-tracking associated with 'dramatic shift' in water vole sex ratio

...- when they noticed a 48% decline in the number of females born at the Norfolk site. At both sites vole numbe...os have been reported in stressed and malnourished females of various species, including water voles. The ecologists suggest this could be explained in terms o...

Gov't Creates Gene Database of Normal Human Tissues

...an average of 11 hours after death, from males and females of different ethnic groups, ranging from ages 3 months to 39 years old. The very large cDNA microarray they constructed has more than 42,000 detectors built into two chips using verified cDNA libraries upon which many other researchers currently rel...

Human Eggs Can Develop From Ovarian Surface Cells In Vitro

... proof that new oocytes may develop in adult human females will be if they can be found to differentiate in v...ization. Eventually, frozen OSE cells from younger females may be preserved for later production of fresh eggs. This may prevent the occurrence of fetal geneti...

Certain fish have a special mating preference

...in St. Louis has shown that for some fish species, females prefer males with larger sexual organs, and actual...e larger one over and over," Langerhans said. "All females had the same preference." A tenet of Langerhans's study was his belief that the gonopodium could be ...

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