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Tag: "reproductive" at biology news

Fish evolve a longer lifespan by evolving a longer reproductive period, researchers find

...ger because there is a selective increase in their reproductive lifespan. Indeed, theory predicts this result because only reproductive lifespan determines fitness." Study results appear Dec. 27 in the online edition of the Public Lib...

Sperm trading can resolve hermaphrodite mating conflicts

...sity of Tbingen have now shed light on the bizarre reproductive conflicts encountered by hermaphroditic animals. In some hermaphroditic species, such as C. hirundinina, mating partners may insist on copulating as a "male," "female," or both, resulting in unique biological conflicts over gender. Sexual interactio...

Genetic testing still smart choice, despite uncertainties

...babies are born each year with the aid of assisted reproductive technologies like IVF, according to the Centers for Disease Control and Prevention. The use of IVF has declined in recent years, but Grifo said that is largely because baby boomers are leaving their childbearing years. Technologies like preimplantati...

Overfishing may drive endangered seabird to rely upon lower quality food

...dying in central California had very low levels of reproductive success. "You'd expect birds to nest every year, ...ggs. The availability of food commonly affects the reproductive success of seabirds." The researchers were able to determine the time of year that individual feath...

Olfactory system detects pheromones that control reproduction

... the vomeronasal system. For example, textbooks on reproductive physiology say that pheromonal modulation of reproductive behavior depends on these connections," said Dulac. "However, our studies show that this idea is wro...

The brain is broadly wired for reproduction

...t governs reproduction and controls the effects of reproductive status on other brain functions. In their studies...particular sensory information -- depending on the reproductive circumstances, such as the stage of the female's estrus cycle." The researchers also sought to dete...

UK sperm donor crisis

...on-line (Thursday 10 November) in Europe's leading reproductive medicine journal Human Reproduction[1]. They rev...tewart, consultant gynaecologist and specialist in reproductive medicine at the Newcastle Fertility Centre at LIFE, to call for a change of tactics in recruiting do...

Birth defects: 8 million annually worldwide

... Ensure a healthy, balanced diet during a woman's reproductive years. Control infections in pregnant women. Train physicians, nurses, allied health professionals and workers in the recognition and care of children with birth defects. Establish national capacity for birth defects surveillance and monitoring. ...

Technique makes it easier to see mouse embryo in all its glory

... that chemical and drug companies perform tests of reproductive safety, but how complete are these studies? Historically, these studies have been semi-quantitative or subjective. However, microCT-based Virtual Histology allows chemical and drug companies to conduct these studies in a much more quantitative way '"...

New discovery: Molecular variation in one gene affects the growth of natural populations

...i genotype affects their flight metabolic rate and reproductive performance. The present result proves that these differences between individuals also have repercussions at the population level. The role of Pgi is emphasised by the fact that variation in the other genes studied showed no connection to population...

Hyena mothers give their cubs a helpful dose of hormones

...netics, physiology and social environment leads to reproductive success for this species." Wolff believes that Holekamp's work will create a paradigm shift in how scientists view the establishment of dominance in mammals. ...

Marine mammals are on the frontline of failing ocean health

...llutants have been shown to affect brain function, reproductive success, and the immune system, but there is little information on the impact of chronic, low-level exposure. Animals like killer whales and polar bears, who share many of our marine foods, accumulate these contaminants in their tissues. Todd O'Hara...

UCSD biologists find new evidence for one-way evolution

...complex traits, like eyes, wings or in this case a reproductive mechanism, is often irreversible. In other words, ...f we had not used the genetic data coding for this reproductive mechanism and only inferred the pattern of evolution based on the traits of living species, we would...

Protein translation in sperm

...hat occur in sperm while they reside in the female reproductive tract ?providing a new understanding of the molecu...rg. After ejaculation, sperm reside in the female reproductive tract for several hours. During this time, a number of biochemical changes take place within sperm, ...

Study: Competition for sex is a 'jungle out there'

...ant diversity, plants suffer lower pollination and reproductive success. For some plant species, this reduction in fruit and seed production could push them towards extinction. One reason that pollen becomes limiting to plants in regions of high diversity may be increased competition between the plants -- there...

Breast implants not associated with cancer risk, study reports

...er, most likely due to differences in lifestyle or reproductive characteristics. We also found no increased risk for brain cancer or for lymphoma, sarcoma, or multiple myeloma," cancers of concern because of earlier suggestive observations. ...

New brain hormone puts brakes on reproduction

...chers have discovered a new actor in the mammalian reproductive system, a hormone that fills a role long suspected...nhibiting the action of the central hormone of the reproductive system - gonadotropin releasing hormone (GnRH). GnRH stimulates the pituitary gland to activate the ...

African amphibians make extreme parental sacrifice: The skin off their backs

...ent an evolutionary intermediate between these two reproductive modes, Nussbaum said. The discovery of this never-before-seen behavior also highlights the importance of conservation efforts, Nussbaum said. "Concerns have been growing about amphibian populations that appear to be declining worldwide. Our discover...

Component in soy products causes reproductive problems in laboratory mice

...tentially adverse consequences of genistein on the reproductive system. "Although we are not entirely certain abo...rly development. "We knew genistein was linked to reproductive problems later in life, but we wanted to find out when the damage occurs," said Retha R. Newbold, MS...

Strawberries by design

...ail." Due to the small size of its genome, short reproductive cycle and small plant size, F. vesca is an ideal model system for genomics in commercial strawberry. The rapid growth of new shoots, the high number of seeds generated and the ease in which new plants may be established, make this plant an ideal cand...

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