A new study of teenagers and their moms reveals how adolescent brains negotiate risk – and the factors that modulate their risk-taking behind the wheel.
Two studies in mice add to the evidence that the phthalate DEHP, a plasticizing agent used in auto upholstery, baby toys, building materials and many other consumer products, can undermine female reproductive health, in part by disrupting the growth and function of the ovaries.
When scientists exposed pregnant mice to levels of bisphenol A equivalent to those considered safe in humans, three generations of female mouse offspring experienced significant reproductive problems, including declines in fertility, sexual maturity and pregnancy success, the scientists report in the journal Toxicology and Applied Pharmacology.
Scientists have found a signal in the brain that reflects young children’s aversion to members of the opposite sex (the “cooties” effect) and also their growing interest in opposite-sex peers as they enter puberty. These two responses to members of the opposite sex are encoded in the amygdala, the researchers report.
An ancient human skull and a jawbone found a few meters apart in a cave in northern Laos add to the evidence that early modern humans were physically quite diverse, researchers report in PLOS ONE.
An experimental drug rapidly shrinks most tumors in a mouse model of human breast cancer, researchers report in the Proceedings of the National Academy of Sciences. When mice were treated with the experimental drug, BHPI, “the tumors immediately stopped growing and began shrinking rapidly,” said University of Illinois biochemistry professor and senior author David Shapiro. “In just 10 days, 48 out of the 52 tumors stopped growing, and most shrank 30 to 50 percent.”