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Female in Biological News

New research finds possible genetic link to cause of pregnancy loss and disorders

... "Where you would normally expect a female to have eight to 10 pups, there were only one or ... mutation increased with a mother's age. As the female mice got older, there was eventually a complete ... male with one bad copy of the gene with a normal female and ...

New theory on why male, female lemurs same size

... long-standing mysteries: Why are male and female lemurs the same size? In most primate species, ... and stays in place for a day or two. Since many female lemurs are sexually responsive to males for only ... the brief time they are available. "If the female has a short receptivity period, as most lemurs ...

Male seahorses like big mates

... clutch, egg and offspring size all increase with female body size in seahorses, suggesting that males may ... body size in mate selection. A total of 10 female and 16 male sexually mature seahorses, obtained ... in courtship behavior between male and female seahorses, with choosy males and indiscriminate ...

Female human embryos adjust the balance of X chromosomes before implantation

... in humans, does, in fact, take place in human female embryos prior to implantation in the womb. Ms ... male embryos showed hardly any signs of XIST, the female embryos started to show signs of XIST at the ... influence the growth rate and survival of female embryos and whether this can be improved." She ...

Evolution of a contraceptive for sea lamprey

... of Medicine may lead to a contraceptive for female lampreys a jawless fish considered an invasive ... "Our research could lead to a contraceptive for female lamprey, providing a method to control their ... with estrogen action and act as contraceptives in female lamprey, providing a method to control their ...

From the glass to the brain in 6 minutes

... between men and women Eight male and seven female subjects participated in the alcohol experiment. ... no differences between the results of male and female individuals the brains of female and male subjects reacted to alcohol consumption ...

Universitat Autonoma de Barcelona researchers first to clone mice in Spain

... mice in Spain. Cloe, Cleo and Clona are three female brown-coloured mice and were born respectively on ... and surrounding cumulus cells from several female mice. The chromosomes were extracted from each of ... In 2003, Spanish scientists were able to clone a female Pyrenean mountain goat using a cell from the last ...

Hypertension among lower-status employees lingers well into retirement

... was stronger for male seniors than for female seniors. Moreover, females in professional positions had more hypertension than female managers, whereas male professionals did not have ... prevalence of hypertension when compared to female managers. Whatever the reason, the link between ...

Women faring well in hiring process for science faculty jobs at research universities

... did appear to make a difference: Having a female chair of the search committee and a high number ... candidates for tenure relative to the number of female assistant professors. In chemistry, for example, ... CLIMATE AND INTERACTION WITH COLLEAGUES: female faculty reported that they were less likely than ...

IFAR contributes to study that finds genes that influence the start of menstruation

... the start of menstruation, a milestone of female reproductive health that has lifelong influences ... influence the normal variation in the timing of female sexual maturation. The researchers say these ... may not only clarify the genetic control of female sexual maturation, but may also point to ...

The importance of being helpful -- Cooperative cichlids boost their own reproductive success

... this has been shown to occur among subordinate female cichlids. Reporting in the online, open-access, ... have been proposed to explain why subordinate female cichlids (Neolamprologus pulcher) often help to ... may also apply to other species, such as the female yellow-bellied marmot, which also adjusts its ...

Genital stimulation opens door for cryptic female choice in tsetse flies

... and reducing genital sensation in both male and female tsetse flies, researchers induced a suite of changes in female reproduction, including reduced ovulation, ... knowledge, this was the first study to look at female choice following experimental manipulation of ...

Late motherhood boosts family lifespan

... suggesting the same genes prolong lifespan and female fertility, and may be more important than social ... studies at the University of Utah. "If you have a female relative who had children after age 45, then ... "you may be able to look at the ages when your female ancestors gave birth rather than just their ...

Sexual harassment from males prevents female bonding, says study

... the effect of sexual harassment on the ability of female fish to form social bonds with each other. The ... found that male harassment not only breaks down female social structures but also affects females' ... into the effect of male sexual harassment on female social networks and social recognition. The ...

Male impotence drugs may deserve a second look in women

... showed the drugs relax the artery in male and female rats. "It shows the drugs need to be ... the internal pudendal arteries in male and female rats as they would be in a non-erect state then ... they don't fully understand the swing, the unique female response likely provides more evidence that ...

Female mammals follow their noses to the right mates

... female birds often choose their mates based on fancy feathers. female mammals, on the other hand, may be more likely to ... Katherine McAuliffe, whose review of evidence for female mate choice is published in the March 2009 issue ...

Changing sexes on the sea floor

... In times of stress like extreme hot spells, the female mushroom coral (known as a fungiid coral) ... survive seems to be their ability to change from female to male," says Prof. Loya. "As males, they can ... favorable, change back to overt females. Being a female takes more energy. And having the ability to ...

Early whales gave birth on land

... Two newly described fossil whales--a pregnant female and a male of the same species--reveal how ... the discoveries, was at first perplexed by adult female and fetal bones found together. "When we first ... the end of the day, we realized we had found a female whale with a fetus." It is the first discovery ...

Older killer whales make the best mothers

... the survival and reproductive performance of each female over time". The authors aimed to investigate ... Killer whales are extremely long lived, with one female believed to be more than 90 years old. Males rarely live past 50, but female life expectancy is considerably longer. Females ...

Early whales gave birth on land, fossil find reveals

... newly described fossil whales---a pregnant female and a male of the same species--reveal how ... was at first perplexed by the assortment of adult female and fetal bones found together. "When I first saw ... "By the end of the day, I realized we had found a female whale with a fetus." In fact, it is the first ...

Researchers may have found why women have an edge on salt-sensitive hypertension

... Georgia. The reason appears to be related to female hormones and a new-found role of a cell receptor ... with hypertension, Dr. Pollock says. In female rats at least, ETA receptors are less prone to ... improvement. When they took out the ovaries, female rats responded more like the males. Dr. Pollock ...

Reproductive life of male mice is increased by living with females

... Living with a female of its species can extend the reproductive life ... Medicine, male mice were housed with or without female mice for 16 to 32 months. Each male was placed ... process. The researchers postulate that a female housed with a male mouse delays reproductive ...

Why you can't hurry love

... enables a male to signal his suitability to a female and enables the female to screen out the male if he is unsuitable as a ... The mathematical model considers a male and a female in a courtship encounter of unspecified duration, ...

Mosquitoes create harmonic love song before mating, study finds

... entomologists have discovered that male and female mosquitoes (Aedes aegypti), which can spread such ... 400 hertz [vibrations per second] for the female and 600 hertz for the male," said Hoy. The ... show that contrary to previous thought, female mosquitoes are not deaf. To study mosquito ...

How chromosomes meet in the dark -- Switch that turns on X chromosome matchmaking

... the trigger that pulls together X chromosomes in female cells at a crucial stage of embryo development. ... exception to this rule are X-linked genes in female mammals. During embryo development, in a step ... one of the X chromosomes is silenced in each female cell to ensure that the levels of X-derived ...

100-meter sprint world record could go as low as 9.48 seconds

... Bolt's current world record of 9.69s. Meanwhile, female sprinters' top annual speeds levelled off in the ... population increase. However, Denny suspects that female sprinters have room for improvement too, and ... And when he calculates the top speed that a human female marathon runner could achieve, Denny suspects ...

CSHL scientists discover a new way in which epigenetic information is inherited

... about fertility in fruit flies. When lab-bred female flies are bred with male flies caught in the ... genetically identical offspring of wild-caught female flies and lab-bred males are fertile. The genetic ... have found that raising the temperature in which female flies are reared raises the proportion of fertile ...

Gender biases in leadership selection during competitions within and between groups

... selecting leaders; preference for a male versus female leader may depend on the specific situation that ... were told that their group had elected a female leader and the remaining volunteers were told ... in the group fund were higher when there was a female leader. For the intergroup condition, there was ...

New cardiology research presented at CHEST 2008

... York compared the CC technique of 28 male and 30 female medical housestaff using a patient simulator, ... group performed adequate CC, while none of the female group performed adequate CC. Post-training, 89 ... group performed adequate CC and 37 percent of the female group performed adequate CC. There was no ...

Repair in the developing heart

... from Australia. They were able to demonstrate in female mice that the healthy cells of the heart divide ... have two X chromosomes. Some of the altered female mice have an X chromosome with the defective Hccs ... intact Hccs gene. However, in the cells of the female animals, only one X chromosome is active. ...

In spiders, size matters: Small males are more often meals

... female spiders are voracious predators and consume a ... that the size of the male relative to the female (often referred to as sexual size dimorphism) ... males and females but rather a case of a hungry female eating a male when he is small enough to catch. ...

Lightweight and long-legged males go the distance for sex

... and identification of with whom each male and female "spent the day." Because a male giant weta ... transferred more spermatophores to females (no female traits predicted female mobility or mating success). "Our findings are a ...

No more big stink: scent lures mosquitoes, but humans can't smell it

... lymphatic filariasis. Oviposition or gravid female traps draw blood-fed mosquitoes ready to lay ... conventional carbon dioxide traps and the gravid female trap. Mosquitoes captured in the carbon dioxide ... the gravid traps is that with the capture of one female mosquito, that eliminates not only her, but ...

Fish cancer gene linked to pigment pattern that attracts mates

... arise from attractive natural markings that lure female mates. A new study published in the Proceedings ... and Molly Morris studied three populations of female swordtails, tiny freshwater fish native to North ... In the current study, the researchers placed a female swordtail in the middle of a tank with two ...

UNH researchers tag first-ever free-swimming leatherback turtles in New England

... researchers have tagged one male and two female leatherback turtles off Cape Cod. They are the ... are swimming at a more leisurely pace; the first female is about 250 kilometers from where she was tagged and the second female swam about 65 kilometers between Tuesday and ...

New study shows compounds from soy affect brain and reproductive development

... of a region of the brain that is important for female reproduction can be significantly altered by ... could cause long-term effects on the female reproductive system. While the study examined ... Patisaul explains that the brains of both female rats ...

X chromosome exposed

... two. The enzyme distinguishes between male and female sex chromosomes in fruit flies and binds to different locations on the male and female X chromosome, the scientists report in the ... throughout the male X chromosome, while on a female X obstructions are more likely to occur. More ...

Relocation of endangered Chinese turtle may save species

... at the Changsha Zoo to collect and transport the female to the Suzhou Zoo where she joined her new mate ... move, but it really was. With only one female known worldwide, and given that we have lost ... males can become aggressive. However, since the female has arrived safely and is settling well into her ...

Do chemicals in the environment affect fertility?

... of the effect of environmental chemicals on female mammals. Part of the Reproductive Effects of ... in recent years, this will be the first time that female fertility has been examined. Currently, less is ... of hormone-like chemicals on the developing female foetus, so the consequences for reproductive ...

Female concave-eared frogs draw mates with ultrasonic calls

... Most female frogs dont call; most lack or have only rudimentary vocal cords. A typical female selects a mate from a chorus of males and then silently signals her beau. But the female concave-eared torrent frog, Odorrana tormota, has ...
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