A mane is a pain, but worth it for male lions
...aned compatriots, but when rival males threaten or females are checking out potential suitors, the dark and--...rm data (recorded by Packer and his colleagues) on females who had had a choice of males in their prides, the females chose the darkest-maned male in 13 of 14 ...Anti-inflammatory drug reduces growth of cancerous tumors In rats
...g) reduced the tumor development in both males and females by up to 63 percent. The scientists also found that rats undergoing surgery showed suppressed NK activity, which was restored after receiving indomethacin. Rats of both sexes that got indomethacin also exhibited behavior suggesting abdominal discomfo...... likely to spark a fierce debate. The viruses make females infertile because they have an added gene for a protein from the zona pellucida, the thick layer surrounding the egg. Females infected with one of the transgenic viruses produce antibodies against their own eggs, damaging them and blocking fertilisat...When mistreated children act out later in life: Brain gene may play a role, study says
...mpler to study. Moffitt speculated that one reason females are generally less antisocial than males might be that, with two X chromosomes, they have a better chance of inheriting the high-activity version of the gene. The team studied a population of young people in New Zealand, whose life histories have bee...Regulating human X chromosomes doesn't use same gene as in mouse
...als, one of the two X chromosomes inherited by all females is turned off during development to prevent a dang...romosome, Xist must be suppressed on one X in both females and males (which have an X and a Y chromosome). Which gene (or genes) does this is still in question...Sprawl may threaten wildlife in reserves
...ttonwoods than in the high-elevation aspen, giving females more opportunity to renest. The researchers also f...lopment. The results suggest that even though more females are renesting in the cottonwoods presumably because robins chase these parasites away. Robins also c...New technologies to battle little known, widespread cattle disease
...mals from infected feed, water and colostrums, and females with high infection can spread it in utero to fetuses. Most animals are infected at less than six months of age, although symptoms don't appear for two years to five years. Besides dairy cattle, other types of cattle, deer, elk, sheep, goats, antelop...Japanese shore crabs invade Penobscot Bay, Maine
...ny as 52,000 eggs, but McDermott believes that the females may have many more eggs than that. Seeley and McDonald's summer research is supported by a grant from Cornell's New York Science Education Program. Understanding the impact this discovery might have on Maine's seafood industry, including Maine's emer...Researchers discover molecular 'switch' that tells body to store or burn fat
... weeks of age, weight was reduced by 29 percent in females and 34 percent in males. The reduced weight of these animals could be accounted for by a dramatic increase in energy expenditure. Indeed, removing SCD-1 completely corrected the effects of leptin deficiency on energy expenditure. "The repression of ...Normal gene control increases chances human stem cells will be safe
...ganisms. By mating males of one kind of mouse with females of another, the researchers created a set of four mouse embryonic germ cell lines in which it's easy to determine whether a gene copy is from the mother or father. With these cells, the researchers can study and manipulate imprinting status, and even...Hopkins scientists return to the mouse to overcome some obstacles in working with human stem cells
...bstacles was to mate males of one kind of mouse to females of another kind. From the offspring, the scientists established four new mouse embryonic germ cell lines. Because the parental genes in the lines are distinct and easily identifiable, the scientists can more easily investigate imprinting and how cell...Humanity's din could be blocking whales' courtship songs
...ions is limited by the encounter rate of receptive females with singing males, the recovery of fin- and blue-whale populations from past exploitation could be impeded by low-frequency sounds generated by human activity." The study was funded by the U.S. Navy's Office of Naval Research, which had supported pr...Jonathon Knight receives ASM Communications Award
...hat can infect insect species and convert males to females for their own reproductive purposes. Wohlbachia t...s kill them in the egg to leave more resources for females infected with their siblings. Most people are blissfully unaware of this gender battle raging in the...Can we learn about sex from animals?
...re dominant also becomes normal. We may miss what females do in our own culture and in those of animals. Man...t turns out, for example, that sexually aggressive females and sexual behavior outside a pair bond are common, which means that sex roles are not defined as na...Scientists discover gene in human egg that may be necessary for female fertility
...ed both copies of the gene and discovered that the females were infertile. According to Dr. Nelson, the researchers discovered that the DNA of human and mouse Mater genes are 67 percent identical. They also found that the proteins produced by the human and mouse Mater genes are 53 percent alike and share a ...UB study finds early nutritional modification programs metabolism, predisposes to obesity
... diet and became obese in adult life. Only the HC females transmit these traits to their progeny, he said, suggesting that the intrauterine experience may be essential for transmission of the metabolic programming. A parallel situation may exist with the overfeeding of human babies, he noted. "Babies who ...New study finds need for improved nutrition for low-income African American females
...a sample of urban teenagers found African American females had the poorest health habits due to their high in...are three major areas of concern regarding a young females diet. One is folate, one of the eight B vitamins, is vital in preventing neural tube defects (NTD) a...Male starlings sing a song of reproductive fitness
...n of sexual finery such as plumage or song. Choosy females benefit by mating with the males with the strongest immune systems, because presumably the offspring inherit some of that high immunocompetence, Duffy explains. For some birds, color and brightness of the males feathers advertise healthiness and attr...Unique social system found in famous Tsavo lions
...re the only lions known to live in large groups of females ruled by a single male. The scientists surveyed th...ion of manes on males. The five resident groups of females they documented had an average of 7.4 adult females per group, large for prides in general. However,......h prevent the digestion of the blood meal and stop females from laying their eggs, says Dr Olivier Sparagano of Newcastle University, England. Dr Sparagano explains, These prototype vaccines can greatly reduce the fertility of female ticks and the survival of their larvae. By reducing tick populations we may...