Tag: "male" at biology news
Females may be more susceptible to overindulge 'sweet tooth' cravings than males
...e, female rats consumed more calories per day than male
rats when given a chance to exercise, overeating...much less dramatic in the female rats, and unlike male
rats, female rats exercised less when sweet foods were available than when sweet foods were not avai...
Wolverine takes a road trip
...ce Armstrong" may be more descriptive as the young male
embarked on a six-week journey that covered some 550 miles within three western states. The results of the study are published in the latest issue of the journal Northwest Science. The WCS scientists had equipped the wolverine with a Global Positi...
European common frog found to use novel mating strategy
...e a straightforward breeding strategy -- one lucky male
grabs the female and fertilizes her eggs as soon a...lized by more than one male. In addition, numerous male
frogs typically gang around the egg clutch for their turn at fertilization. According to Vieites, ge...
Researchers identify distinctive signature for metastatic prostate cancer
...d experiments in mice in which they eliminated the male
hormone, androgen, causing regression of the prostate. Normally, restoring androgen causes the prostate to regenerate. However, the scientists were able to block this regeneration by giving the animals cyclopamine or a Hedgehog-neutralizing antibody....
New treatment for fibromyalgia
...se are unclear," Dr. Arnold observes. "Because the male
subgroup was small, reflecting the much higher prevalence of fibromyalgia in women, the results of the study may not be generalizable to all men with fibromyalgia. There may also be sex differences in fibromyalgia that affect treatment response." As ...
IBD (Crohn's/ulcerative colitis) conference adds 18 speakers; APS meeting starts Thursday
...sufferers in the U.S., about equally split between male
and female, with about 30,000 new diagnoses a year. CCFA noted that a large HMO tracked IBD-related hospitalizations over six years and reported exactly the same rates for whites and blacks, 10.2 per 100,000 admissions. The hosp...
New evidence of radiation risk in childhood leukaemia
...utation rates in unexposed offspring of irradiated male
mice do not return to the mutation rates seen in u...e second generation of offspring, through both the male
and female germ-lines. Dubrova and his colleagues developed a novel, effective method for monitorin...
Critically endangered monkey species plummets more than 50 percent since 1994
...nsustainably tiny populations. When hunters kill a male
critical for reproduction, for example, it spells annihilation for the entire group. Delacour's langur is threatened mostly from hunting. Poachers kill the animal not only for meat, but for bones, organs and tissues that are used in the preparation o...
Two warbler species find the West isn't big enough for both of them
...s testosterone and dihydrotestosterone have given male
Townsend's warblers the upper hand in competition for territory and mates. The Townsend's greater aggressiveness, fueled by the higher androgen levels, has pushed hermit warblers out of their former range and into territory, often less desirable, tha...
The insect police: Why social insects punish cheating comrades
...ated the extent to which workers produce their own male
offspring and whether this was determined by how related the workers are to each other (e.g. some colonies are run by more than one queen); the 'efficiency hypothesis' predicts no such relationship. Contrary to expectations, they found evidence that ...
Circadian clock genes reign in duration of fruit fly copulation
...Laura Beaver and Dr. Jaga Giebultowicz, found that male
flies lacking one of two circadian clock genes, "p...to 3050% more time in copulation than their normal male
counterparts. The effect is sex-specific, because mutant female flies copulating with normal males d...
Length of sex act in flies dictated by genetics
... in the clock genes "period" and "timeless" caused male
flies to copulate significantly longer than usual....d recently that when these genes are missing, both male
and female fruit flies produce less sperm and eggs, and are less fertile. In the course of this rese...
Nevada researcher re-ignites mammal reproduction debate
...llard said that large healthy mammals produce more male
offspring when living in good conditions, such as ... hypothesis demonstrated the idea that having more male
offspring leads to greater evolutionary success for mammal parents, if living conditions support lar...
Asian elephant sex pheromone transporter revealed
...niffing and "check and place" responses, where the male
touches his trunk tip to the pheromone-loaded urine. Next, the male
places the pheromone urine in his mouth, in a behavior known as flehmen, after which mating behavior...
Newly discovered protein may be key to muscular dystrophy
...ease, primarily affects boys -- about one in 3,500 male
births. It typically begins in early childhood. Children often experience leg weakness, falling and progressive loss of movement, eventually becoming wheel chair-dependent. Many die in their late teens or early twenties. Currently, there is no cure. ...
Biologists deciphering complex lemur scent language
...keNew19.html . Preparations for battle begin when male
combatants load their "weapons" vigorously ...ulder gland produces a thick brown paste. And both male
and female genital glands produce a sticky goo that females might mix with urine, and which might ha...
Sex pheromone blocked in bug
...ng her palate. As they fly toward the female, the male
beetles come across wafts ofpheromone separated by periods of no scent. To get an accuratereading and stay on course, the beetle must constantly reset itspheromone detection system. Leal worked with Martine Maibeche-Coisne and Emmanuelle Jacquin-Jol...
Size does matter when choosing a mate
...tions throughout the animal kingdom - for example, male
gorillas are much bigger than female gorillas, whereas male
rats are only slightly larger than female rats. In this new research, scientists from the Universit...
Parasitic cowbirds thrive with a less ruthless strategy than cuckoos
...ucted DNA analyses of the chicks to make sure that male
and female chicks were equally represented in the study. The researchers found that by day eight, cowbird chicks raised with two phoebe chicks were, on average, 14 percent heavier than cowbird chicks raised alone. Also, phoebe parents brought food to...
Study: Mothers turn fearless when peptide level drops
... the researchers removed the pups and introduced a male
intruder. Under normal conditions, femal...of CRH didn't attack at all. "When we put the male
in the cage, some moms would just sit there. They weren't protective at all. If anything they were s...
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