Pesticide combinations imperil frogs, probably contribute to amphibian decline
...ites - frogs with female sex organs invading their testes - decreasing the size of their vocal organs, which are critical to mating success, and causing a tenfold drop in testosterone in mature male frogs. In the current study, he looked again at atrazine as well as three other herbicides, two fungicides an...Sperm stem cells closer to being like embryonic stem cells
...entify when mixed with other cell types. "The rat testes contain other cells types in addition to stem cells," Dr. Hamra said. "If these other cells are included in the culture, they produce chemicals that block the ability of the stem cells to remain stem cells. We're still trying to figure out why. But t...New ECCO 13 studies probe impact of haematological cancer therapy on future fertility
...the regimens' expected gonadotoxicity (toxicity to testes or ovaries). Overall the study revealed 71% of men and 76% of women who attempted post-treatment parenthood following treatment for Hodgkins lymphoma, were successful - 10% of men and 1% of women used assisted reproduction techniques. It is estimate...Sudden change in social status triggers genetic response in male fish, study finds
...ostentatious colors and stripes disappear, and the testes shrink and the male becomes infertile. "Previously we did an experiment in which we moved the subordinate male out of the tank and put him in a situation where he could rise and become dominant," Fernald says. "Because he was in a new situation, ...Human Y chromosome preserves itself better than the chimp Y
... genes on the Y, those that are active only in the testes and make the sperm, come in pairs and somehow repa...zees make much more sperm than humans do, so their testes need to be operating at high capacity. As a result of the newest research, Page added, "we can also ...Most common lung cancers may begin in newly discovered cells
...ed reports of stem cells found in the skin, brain, testes and gut. The lab has already teamed up with another research group to develop microscopic fluorescent probes to image the unique molecular surface of BASCs and track the progress of the naturally arising tumor, Jacks said. The similar genetic activit...Study in Royal Society journal on heritability of female orgasm
...mongst these the storage of mobile phones near the testes was found to decrease semen quality. Contact: Professor LWS Simmons, School of Animal Biology (M092), The University of Western Australia, CRAWLEY, 6009, Australia Novel male trait prolongs survival in suicidal mating MCB Andrade, L. Gu and JA Stolt...How the environment could be damaging men's reproductive health
...ent of male foetuses. Babies born with undescended testes are at higher risk of developing testicular cancer...ter. Sixty-nine (5.7%) of the boys had one or both testes undescended. After one year the testes had descended fully in 51 of the 68 children (75%) who were f...Royal Society study on adaptability of fish to warming oceans
...in rodents between the size of the sperm-producing testes and the prevalence of multiple paternity within litters, together with an association between sperm competition intensity and the size of the seminal fluid-producing accessory reproductive organs (seminal vesicles and prostate). These comparative fin......e animals are initially fertile indicates that the testes have the capacity to produce sperm," said Richards...ale mouse that lacked TAF4b. When she compared the testes of these animals to those of normal mice, she found that the organs were much smaller in the mice th...Protein delivers selenium for normal sperm development
...erstand the physiological function of SEPP1 in the testes and epididymis of mammals, a team of scientists at Vanderbilt University in Nashville studied male mice that lack the gene to produce SEPP1. These genetically altered males have levels of selenium in the testis that are less than 10 percent of those ...Melatonin shrinks bird gonads. What does the popular supplement do in humans?
...). In birds, switching off GnRH causes the gonads testes and ovary to shrink as part of the birds' yearly cycle. Though the role of melatonin is likely to be more complex in humans, the fact that the hormone has such a big effect on birds suggests it could have significant though unnoticed effects in huma...A gene's fist 'kiss' sets off that affair known as puberty
... turn, these rising levels of LH and FSH cause the testes and ovaries to produce the sex hormones testosterone and estradiol, the culprits responsible for the physical changes and emotional baggage of male and female puberty, respectively. "We now have very good evidence that the GPR54 gene and its switch,...'Old-fashioned' gonad capsule simple and effective for blocking radiation to testes from MDCT scan
...ray imaging also reduces indirect radiation to the testes during MDCT of the abdomen and pelvis, according t...of Technology of Aachen in Germany. Protecting the testes from radiation is important because the testes are sensitive to radiation damage, which could result...Sperm enzyme is essential for male fertility, study shows
..., the females were normal and the males had normal testes and sperm counts, but they were infertile, O'Brien said. And when the researchers analyzed sperm movement under a microscope, they found a surprise. "We expected that a type of motility known as 'hyperactivated motility' would be inhibited, but found...Sexual competition drives evolution of a sex-related gene
... For example, more polyandrous species have larger testes capable of producing more sperm. There is a metabolic cost to such adaptation, Lahn said, and in species where there is no competition, the cost is not worth the effort. "Now, for the first time, we show such competitive effects, not only at the lev......f green light when they grew and reproduced in the testes of the recipient mice. Similarly, about half of the baby mice fathered by the recipient mice also glowed green (See photo at http://www.nichd.nih.gov/new/releases/green_brown_mice.cfm .) ...