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Tag: "reproductive" at biology news

Viral hitchhiker inhibits Wolbachia bacteria's ability to proliferate

... ability to cause cytoplasmic incompatibility, the reproductive manipulation of its insect host. Until now, scientists believed the virus was somehow inducing this process. But viruses pirate cells to reproduce, often killing the cells as a result. So Bordenstein and his colleagues hypothesized that by preyin...

How healthy is that marsh? Biologists count parasites

...ationships that must be occurring to support their reproductive lifecycle. "Trematodes require all of the pieces of the puzzle to complete their lifecycle," Lafferty said. "When we see a lot of parasites in an estuary, we know it is in good shape. For example, an estuary with high infection rates tells you that ...

Even a little cooling helps after cardiac arrest

...ationships that must be occurring to support their reproductive lifecycle. "Trematodes require all of the pieces of the puzzle to complete their lifecycle," Lafferty said. "When we see a lot of parasites in an estuary, we know it is in good shape. For example, an estuary with high infection rates tells you that ...

Even when faint, ovary scent draws sperm cells

...bit chemotaxis toward extracts from various female reproductive organs, but the role of chemotaxis in reproduction... study of various compounds released by the female reproductive organs under various conditions might further our understanding of these processes." Understanding...

Genetic snooze button governs timing of spring flowers

...us implications for agriculture. Flowers are the reproductive organs of plants and are responsible for forming seeds and fruit. As their name implies, biennials complete their life cycles in two years, germinating, growing and overwintering the first year. The second year, the plants flower in the spring and d...

Bird brains shrink from exposure to contaminants

...n regions. "We found that the regions sensitive to reproductive hormones--song production and courtship behaviour--were most affected by DDT," said Iwaniuk. "Song production is extremely important in attracting a mate or to mark out a territory. "The issue is not that DDT is killing these robins but if they are...

Airborne mold spores increase kids' risk for multiple allergies

... a plantlike organism that grows by releasing tiny reproductive cells (spores) into the air. Mold is a type of fungus that can grow on any moist surface--including wood, drywall and cement. Previous allergy studies focused on visible mold or total mold concentrations, not the identification of specific airborne ...

Dominant meerkats render rivals infertile

... Evicted subordinates, typically those with whom reproductive conflict is most likely (females of breeding age, older, and pregnant females), suffer repeated attacks and chases throughout this period, leading to dramatically increased levels of stress hormones and a collapse in fertility. This tactic reduces co...

UCLA study finds same genes act differently in males and females

...en the sexes. The differences were not related to reproductive systems ?they were visible across the board and related to primary functions of a wide variety of organs." The UCLA findings support the importance of gender-specific clinical trials. Most medication dosages for women have been based on clinical tr...

Fertility hope as study shows eggs survive in older ovaries

...y issue of Reproduction. In the mammalian ovary, reproductive cells called oocytes (eggs) develop within ovarian follicles. In humans, the eggs are believed to die off from late in foetal life, after birth and into adult life. When egg numbers decline towards zero females can no longer reproduce ?resulting in t...

Female birds boost up their eggs when hearing sexy song

... a remarkable consistency in their behavioural and reproductive performance and the song stimuli alone were suffic...ghlights the importance of behavioural stimuli for reproductive physiology. Bathroom Pavarottis beware. ...

Researchers report technique for freezing and preserving genetically enhanced pig embryos

... by a University of Missouri-Columbia professor of reproductive biotechnology have reported success in freezing and preserving swine embryos that were created by in vitro techniques and that carried modified genetic material. After thawing and transfer to a surrogate mother, some of the embryos went on to produce...

Tamed 11,400 years ago, figs were likely first domesticated crop

...because such figs do not produce seeds, they are a reproductive dead end unless humans interfere by planting shoots from the parthenocarpic trees. "Once the parthenocarpic mutation occurred, humans must have recognized that the resulting fruits do not produce new trees, and fig tree cultivation became a common p...

Researchers find that bumblebees' flower choice matters

... of various combinations of plant species on their reproductive patterns. Twice funded by the National Science Foundation, Karron's research centers on the reproductive biology of monkey flower, a wetland plant native to Wisconsin. Karron's lab uses several innovative ...

Looking to a new era in bee research

...e process of caste determination, which results in reproductive queens and largely sterile workers. They also address some of the challenges faced by honey bees, including analyses of disease resistant pathways and metabolic adaptations to an all floral diet. Several papers address ways that honey bee studie...

Beauty and the brain

...species, which we are presumably not assessing for reproductive purposes. So Winkielman, with colleagues from t...s ?in an attempt to "use stimuli that were free of reproductive content," Winkielman says, and would "get at a general principle of cognition" ?Winkielman and his c...

Solvent exposure linked to birth defects in babies of male painters

...re the influence of resulting solvent exposures on reproductive health," said Dr. Burstyn, who collaborated previously on a study showing that water-based paints did not eliminate solvent exposure among construction painters. Organic solvents are widely used in many industries including plastics, metals, electr...

Mother birds give a nutritional leg up to chicks with unattractive fathers

...ede limitations of a suboptimal pairing on her own reproductive success. "For house finches, a species in which ...ent a high risk of death, a focus on the immediate reproductive attempts may be the only viable strategy," write the researchers. "By depositing antioxidants in a c...

Complexity constrains evolution of human brain genes

...ys Wu. "For example, genes expressed only in male reproductive tissues have evolved very rapidly." Brains, however, "are intriguing in this respect," Wu says. Genes that are expressed only in the brain evolved more slowly than those that are expressed in the brain as well as other tissues, and those genes evo...

Age-related changes in DNA repair illuminate the connection between age and genetic damage

...bly much slower. The new results show that the reproductive cells of young flies tend to use the rough-and-ready repair processes that do not involve extensive DNA synthesis and do not require a matching DNA template for the repair. As the organisms age, however, the same kind of DNA breaks are repaired prima...

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