JCI table of contents: Jan. 18, 2007
...paired sexual development due to a deficiency in a sex hormone known as GnRH. Although individuals are thought to inherit IHH by having just one gene defect (in any one of a number of genes), not all the evidence supports this hypothesis, for example, not all family members with a given gene defect have ...The secret women keep from themselves
... "Work and family come first. We end up putting sex low on the priority list," Dr. Clayton notes. "Then when our partner initiates sex, it's just another task. I really believe that we as women accept a level of dissatisfaction that we don't need to accept." Cultural and religious beliefs often pla...How are phenotypic differences between sexes related to phenotypic variation within sexes?
...tematically different between members of different sex in the same species, such as peacocks' tail feathers tend to vary a great deal among individual males, and that much of this within-sex variation depends on individual condition. Indeed, theory predicts that sexual dimorphism will evolve based on co...Other highlights in the January 3 JNCI
... X or Y chromosomes. Because alterations on the sex chromosomes might affect the probability of having sons or daughters, Susan Harlap, M.D., of Columbia University in New York, decided to study cancer incidence and offspring among men participating in the Jerusalem Perinatal Study. During the study p...Bisexual fruit flies show new role for neurochemical
Fruit flies' ability to discern one sex from another may depend on the number of receptors on the surface of nerve cells, and the number of receptors is controlled by levels of a ubiquitous brain chemical, University of Illinois at Chicago researchers have found. Everything from the abili...Sex ends as seasons shift and kisspeptin levels plummet
...r species, if the environment is not satisfactory, sex drive will decline; kisspeptin is likely part of t...n region important for regulating reproduction and sex behavior compared to hamsters in simulated summer conditions. Winter hamsters, however, were just...Androgen therapy may slow progress of Alzheimer's disease
...er's disease (AD) suggest that treatment with male sex hormones might slow its progression. The findings,... of A in the brain. Testosterone, the primary male sex hormone, is one in a group of related steroid hormones referred to as androgens. Recent studies sugg...Embryonic selection of sex avoids conceiving blind children
...ue Country, to successfully carry out an embryonic sex selection in a woman who is a carrier of the disea...ity of being carriers. The embryonic selection of sex is the only recourse open in order to avoid male children suffering from the disease with the conseq...A new male-specific gene in algae unveils an origin of male and female
...w oogamy arose from isogamy, a more simple form of sex in which very similar reproductive cells take on d...that P. starrii maleness evolved from the dominant sex (MT-) of its isogamous ancestor. This breakthrough in understanding provides an opportunity to addre...'Lessons learned' highlighted as global politics of HIV/AIDS examined in new research
...st-risk communities such as the gay population and sex workers. The themes considered in this symposium represent only some of the ways in which the social science of HIV/AIDS can be approached. All four articles provide greater insight into crucial dynamics in the politics of HIV/AIDS such as mobiliz...Brain wave changes in adolescence signal reorganization of the brain
...ndicator of brain maturation, is linked to age and sex but not to pubertal stage," was undertaken by Irwin Feinberg, Lisa M. Higgins, Wong Yu Khaw and Ian G. Campbell, all of the University of California, Davis. The American Physiological Society published the study, which appears in the December issue o......e, giving rise to a unique new genome. But how did sex itself evolve" Researchers at the Department of En...his specialized cell division produces gametes, or sex cells, each of which has only one copy of each chromosome instead of the two copies most cells carry...NJIT women scientists and engineers use new information technologies to tackle isolation on campus
...structs, with a special interest in how gender and sex are depicted in U.S. film and television. Her scholarly publications include essays on science fiction writers James Tiptree and H.G. Wells and the classic 1950s science fiction film Invasion of the Body Snatchers. Steffen-Fluhr received her PhD f...Scientists discover role for dueling RNAs
...y thought to have no function, may in fact protect sex cells from self-destructing. These findings will b...ates sense RNA. This same process may occur in the sex cells of mammals. In fact, considering how widespread these antisense transcripts are, I wouldn't be...Climate change creates dramatic decline in red-winged black bird population
...y hatch, so that shift has affected the population sex ratio." Over the years, Weatherhead's team has p...g season to see if that has changed, affecting the sex ratio as well."...Why do insects like to eat some plants more than others?
...oductive allocation can attract enemies means that sex may be even more costly than previously though. This research also has implications for weed control and protection of rare plant species....Sperm proteome gives 'tantalizing glimpse' towards the origin of sex
...ns found in sperm could help reveal the origins of sex and explain some of the mysteries of infertility, ...r sexual reproduction. This will shed light on how sex itself evolved. "This is the first catalogue of sperm proteins for any organism, and it offers a t...Scientists discover way to block growth of prostate cancer cells
...t time a specific biochemical pathway by which the sex hormone, androgen, increases levels of harmful chemicals called reactive oxygen species (ROS) in the prostate gland that play a role in the development of prostate cancer. They found that a drug that blocks this pathway significantly prolonged surv......earch focuses on the genetic basis of variation in sex pheromones. The results will document how directional selection can modify sex pheromones. Both awards will be presented at the ESA's 2006 Annual Meeting in Indianapolis on Dece...