APS recognizes Intel high school finalists for experiments in physiology
...d whether most anterior cruciate ligament tears in females result from an enhanced response to relaxin, a polypeptide hormone. Ms. Landstrom used porcine tissues (Achilles tendon strips) in an in vitro study done entirely in her school laboratory. Her paper was entitled, The Effects of the Relaxin Hormone o...Monkey business: Studies show tiny callimicos have unusual characteristics
... although she did observe groups with two breeding females on several occasions. Groups engage in cooperative infant care, sharing food and carrying infants on their back. Porter said fruit and, to a lesser degree, grasshoppers are callimicos' primary foods. However, in the Amazonian dry season when fruit ...Fat cells could provide the key to a longer life
...," added Professor Partridge. "It could be because females are more influenced by food and its consequences. ...or this. Males tend to move around a lot - to find females and persuade them to mate, and need less nutrients to make things. But this is just speculation." Th...Parting genomes: UA biologists discover seeds of speciation
...ating with D. arizonae males, but when D. arizonae females mate with D. mojavensis males, all of the resultin...erile sons. That result implies that only half the females in the Catalina Island population had the gene (or genes) for hybrid male sterility. Surprisingly, ...Sex-specific differences in gene expression related to drug metabolism and hypertension
...eresting implications for explaining how males and females respond differently to drug treatments and sex-spe...looking at molecular differences between males and females at multiple developmental stages, including puberty, as well as differences in subpopulations of cel...Why some diabetics are at greater risk for UTIs
... Microbiology. "Patients with type-2 diabetes and females with gestational diabetes are at higher risk for a...o understand why patients with type-2 diabetes and females with gestational diabetes have a higher incidence of urinary tract infections."...Male susceptibility to disease may play role in evolution of insect societies
...fected are the division of labor between males and females and the relative social isolation experienced by m...insects are called haplodiploids because males and females have a different number of sets of chromosomes. The females, like most animals, including humans, a...More news in the battle between the sexes
...s from the conflict populations are more costly to females than familiar males and that sexual selection can be costly to fitness. However, they also found that at intermediate levels of sexual conflict, benefits of sexual selection may outweigh these costs. These findings support previous work indicating th...Without words, bullfrogs communicate through stutters in their croaks
...It is known that the male bullfrog's call attracts females for mating, maintains territorial boundaries with other males, and indicates that the frog is healthy and aggressive. "Some animals have evolved large, complex vocabularies to communicate, while others say a lot with very limited numbers of calls," ...Research into cetacean reproduction leads to birth of killer whales by artificial insemination
... the reproductive physiology of these animals. The females were between 13 and 20 years old and weighed about 5,000 pounds. The male was 20 years old and weighed more than 11,000 pounds. All were trained to cooperate in a variety of procedures involved in the research. Noninvasive techniques were used to col...Penguins ingest mollusk shells to obtain calcium for thicker eggshells
... which could alleviate hunger during the fast. But females lacking other sources of calcium ingest significan...d female. But during the period around egg-laying, females were far more likely to have shells in their stomachs than males. "Basically, they're getting a slow...For a male sand goby, playing 'Mr. Mom' is key to female's heart
...der at building nests and taking care of eggs when females are present the first time such "courtship parent...t males would provide more care for their young if females were present. Both humans and animals often engage in two-faced behavior. But the general rule in b...March of Dimes awards $250,000 prize to pioneering scientist
... have one X chromosome and one Y chromosome, while females have two X chromosomes. More...X chromosomes for many years. Why, they asked, do females thrive despite having a double dose of the genes located on the X chromosome? And why is it that mo...In male monkeys, too much soy has adverse effects
... studies have shown no difference in aggression in females given large doses of soy, Kaplan said. The study was done over 15 months with adult male monkeys who were divided into three groups and fed different amounts and types of protein. One group had about 125 mg of isoflavones a day. The second group had ...New research finds summer-born women have fewer children
...rn in summer and winter, indicating that males and females might respond differently to the season of birth." Dr Huber said there could be many possible causes for the association between birth month and reproductive performance. "It could be the effects of the conditions experienced during fetal and neonata...Newfound grasshopper takes to the trees on Konza Prairie
...ntomologist, subsequently collected five males and females from hackberry tree trunks in October 2003. Melanoplus punctualatus, the Grizzly grasshopper, was first identified in the United States in 1862 by an entomologist named Scudder, who specialized in grasshopper identification studies. Th...Young chimpanzees show sex differences in learning
...e mounds and pull out a tasty meal of insects, but females learn earlier, spend more time at it and tend to c...on at the Lincoln Park Zoo in Chicago. While young females perfected the art of termite fishing, young males spent more time playing and swinging around--behav...Culture of primate non-aggression
...ful lifestyle, including the potential impact that females could have in regulating male behaviour. Teasing out the mechanisms for such complex behaviors will require future study but, as Frans de Waal states in a related article in the same issue of PLoS Biol, "with the study by Sapolsky and Share we now ha...UF researcher: Animals think in their own way, but unlike humans
...ustralian dolphins sex is quite violent, with most females coerced into the activity, he said. Another misunderstood critter is the Central American vampire bat, which, contrary to its foreboding name, happens to be the only nonhuman species to reciprocate goodwill, Wynne said. Vampire bats that don't get ...... that reproduce asexually and sexually, one or two females is all you'd need," he said. ...