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
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."
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
"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
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
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
The reason appears to be related to female
hormones and a new-found role of a cell receptor ... with hypertension, Dr. Pollock says.
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
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
While the study examined ...
Patisaul explains that the brains of both female
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.
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 ...