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Tag: "male" at biology news

Pregnancy drugs can affect grandkids

...ny change," they say. Sharing song types - when a male replies to a rival's song with the same song sequence - with neighbours is common in birds, and is thought to act as a threat signal between males, which would explain why birds have evolved such complex song repertoires. The Dupont's lark is a rare...

Interactive 3-D atlas of mouse brain now available on web

...base consists of 3-D anatomical data from 10 adult male mice of the strain C57BL/6J, and contains data on 20 segmented structures, including variability of brain structures across the strain, and downloadable visualization tools. The research that makes up this database was published as a cover article i...

Clawed frog helps Fanconi anemia research make leaps

...tivating the extract and adding sperm DNA from the male frog, the proteins in the extract unwind the DNA and the replication process is off and running under the watchful eyes of the researchers. "That's just the beginning of what we want to do with these extracts to study how the Fanconi proteins work,...

New male contraceptive clears hurdle

...ical trial in India. The trial is studying a new male contraceptive, RISUG (Reversible Inhibition of Spe...ables the sperm as they swim by. In study animals, male fertility returns if the RISUG is flushed out with another injection that dissolves the gel. Elaine...

Hormonal male contraception reversible after few months for all men

With hormonal male contraception likely to be available in the near f...versible within a few months. Currently available male contraceptive methods (condoms, withdrawal, and vasectomy) are not acceptable to many couples becaus...

New study explores beetle species with two forms of females

...iple matings differ for males and females. "The male versus female arms race (involving physical structures, behaviors, chemicals, etc.) for control over mating may take place over evolutionary time, which in theory can lead to the formation of a new species," explain the authors. Examining species o...

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

...pollution, could spark the development of far more male fish than female, thereby threatening some species... an overabundance of males. As these predominately male fish mature, it is unlikely they will be able to reproduce in sufficient numbers to maintain sustain...

Growth hormone is made in the brain, report scientists

... differences. People used to think of females as a male with hormones. That's just not the case." The authors found that growth hormone in the brain is increased with stress, especially in males. The effect in females depended on how much estrogen they had at the time. "One interesting interpretation o...

Alcoholism, smoking and genetics among Plains American Indians

... In statistical terms, although 62 percent of the male alcoholics and 40 percent of the female alcoholics...majority of alcoholism studies are conducted among male alcoholics, and also among treatment alcoholics. The assumption has always been 'everything you fin...

'Uniquely human' component of language found in gregarious birds

...ferent 'rattles' and eight 'warbles' from a single male starling and combined them to construct a total of 16 artificial songs. These songs followed two different grammars, or patterning rules. Eight songs followed the "finite-state" rule, the simplest sort, thought to account for all non-human communi...

UCLA scientists find male gene in brain area targeted by Parkinson's

...red that a sex gene responsible for making embryos male and forming the testes is also produced by the bra...ines gender and makes embryos male. Located on the male sex chromosome, SRY manufactures a protein that is secreted by cells in the testes. Now, in an unex...

High-tech tags on marine animals yield valuable data for biologists and oceanographers

... did the bait fish. We were only able to tag three male sea lions that year, and they went much farther off shore than usual to find food. They've always been described as a strictly coastal species, but they went as far out as 300 miles from the coast," he said. At the same time, Costa's group was also ...

Male rivalry increases when females at most fertile, say researchers

...us studies have found that women's preferences for male physical appearance vary according to their fertil...ception ?and is therefore more fertile. Images of male faces that were either high or low in dominant features, such as a strong jaw lines and thinner lips...

Testes to incubate stem cells

... culture human spermatogenic stem cells to restore male fertility after cancer therapy," says Hannu Sariola, from the University of Helsinki in Finland who is also working towards a similar goal. Bizarrely, a brain cell growth factor also has a powerful influence on spermatogonial stem cells. Glial cell...

Researchers release new variety of asparagus

...rket." Asparagus, a perennial vegetable, has both male and female plants. In the case of DePaoli, first a male parent and a female parent are selected for their good characteristics including spear size, spear q...

Warbling whales speak a language all their own

...air--to communicate. For six months each year, all male humpback whales in a population sing the same song during mating season. Thought to attract females, the song evolves over time. Suzuki and co-authors John Buck and Peter Tyack applied the tools of information theory--a mathematical study of data e...

Mayo Clinic collaboration discovers protein amplifies DNA injury signals

...icient mice showed symptoms of growth retardation, male infertility, immune defects and chromosome instability. The Next Step Now that they understand MDC1's role in amplifying distress calls from injured DNA to cue the repair process, the Mayo researchers are investigating another system that appears...

When mice choose mates, experience counts

...olleagues exposed female mice to odors of either a male mouse alone or a male mouse with a female. The females consistently preferred the scent of males linked to other females. ...

Protein translation in sperm

...ould give us better understanding for treatment of male infertility and developing new male or female contraceptives." ...

Attractive birds more immune against bird flu

...nal Acta Zoologica, that the size of the spot on a male collared flycatcher's forehead reflects how well t...sson and Professor Lars Gustafsson have shown that male Gotlandian collared flycatchers with few dangerous blood parasites have larger forehead spots. The n...

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