Talented sniffer: A receptor known for guiding sperm to egg plays a role in the nose
...wn to act in sperm, where it appears to help guide sperm to the egg during fertilization, is also expressed...for mammalian olfactory receptor proteins. Having sperm successfully locate the egg is a crucial step in fertilization. Recent evidence had shown that hOR17...Study in Royal Society journals presents evidence for inherited factors in homosexuality
...epth and orientation-recording tags attached to 23 sperm whales using suction cups, we found they consisten... were higher. These results clearly indicate that sperm whales produce click buzzes during prey capture, as do bats which are a million times smaller. As c...Researchers grow sperm stem cells in laboratory cultures
...rcome a technical barrier and succeeded in growing sperm progenitor cells in laboratory culture. The resea...to infertile mice, which were then able to produce sperm and father offspring that were genetically related to the donor mice. "This advance opens up an ...Growth factors confer immortality to sperm-generating stem cells
... the continually self-renewing cells that produce sperm to exist in culture indefinitely. Their findings... culture for three months, the stem cells restored sperm production, and therefore fertility, in infertile mice. According to the researchers, this developm...Sexual competition drives evolution of a sex-related gene
...ar "chastity belt" to prevent fertilization by the sperm of subsequent suitors, though they might also prevent semen backflow to increase the likelihood of fertilization. Lahn and his colleagues compared the SEMG2 gene, which contains the blueprint for semenogelin, from a variety of primates. They began...Reassuring findings from first study on sperm donor identification
...ould help allay fears that removing anonymity from sperm donors might lead to problems for the children or ...nts who had been conceived through 'open-identity' sperm donors, US researchers found that all but one of the 29 young people involved in the study had a neu...Sperm enzyme is essential for male fertility, study shows
... Chapel Hill has determined that a novel enzyme in sperm is essential for sperm motility and male fertility. The new study may offer a potential target for an effective, non-hormon...JCI table of contents, November 15 2004
...e from the one fertilized cell after fusion of the sperm and ovum during fertilization. This condition is known as mosaicism. In most cases of clinical mosaicism, the linear patterns of abnormal skin are surrounded by normal skin termed type 1 mosacism. Several patients have been described whom experience...Researchers piece together the puzzle of Hailey-Hailey skin disease
...e from the one fertilized cell after fusion of the sperm and ovum during fertilization. This condition is known as mosaicism. In most cases of clinical mosaicism, the linear patterns of abnormal skin are surrounded by normal skin termed type 1 mosacism. Several patients have been described whom experience...Scientists discover key egg enzyme for blocking sperm entry after fertilization
Countless sperm may surround an egg at one time, yet only one must...that enables an egg to physically block additional sperm from entering after fertilization. Preventing polyspermy in sea urchins and many other animals inv...Free radicals and fertilization: Study reveals egg protection secret
...ch as sea urchins, fish, mice and humans, only one sperm fertilizes an egg. If multiple sperm fuse with the egg, a process known as polyspermy, the embryo will die. So the fertilized egg quickly...Efforts to clone primates move forward
...he resulting egg cell ready for fertilization by a sperm cell, which would provide a similar complement of chromosomes. In other animal cloning work, eggs had been enucleated at metaphase II, part of the second stage of meiosis. Once the maternal genetic material was removed, it was replaced by donor nucl...US researchers warn of possible fertility risk to men using laptop computers on their laps
...ce that elevated scrotal temperature can result in sperm damage, prompted researchers from the State Univer...gradient capable of inhibiting spermatogenesis and sperm concentration may be decreased by 40% per 1C increment of median daytime scrotal temperature. ...Needling chromosomes yields insights into cell division
...n, called mitosis, as well as the proliferation of sperm and egg cells called meiosis. "Chromosomes in mitosis and meiosis have to be held together, because otherwise they don't attach to the apparatus called the spindle that distributes them to opposite poles," explained Nicklas, who is a Research Profess...Highlights of January 2005 issue of Biology of Reproduction
...ferous tubules, where they proliferate and undergo sperm development, it has been hoped that the system could be adapted for germline modifications. This, however, entails a number of challenging technical steps such as the propagation of cultures of spermatogonial stem cells, introduction of genetic modif...'Old-fashioned' gonad capsule simple and effective for blocking radiation to testes from MDCT scan
...age, which could result in cancer, infertility, or sperm mutation. For the study, the researchers analyzed 66 men who underwent routine MDCT of the abdomen and pelvis, 34 of whom used the gonad capsule and 32 of whom went without. The researchers found that the radiation dose to the testicles of the 34 who...Development of portable infectious disease detector
...y detector that can be used in the home to measure sperm motility with an accuracy comparable to laboratory analyses. "I'm thrilled at how well the VIIBRE and PRIA technologies mesh," says John P. Wikswo, professor of biomedical engineering, physiology and physics at Vanderbilt and director of VIIBRE. "We ...Unusual reproductive behavior of odd ants surprises scientists
...time (this causes the queen to build up a sizeable sperm bank.) Queens can store sperm and lay eggs during their entire lifetime. All queens in the study laid about 60 fertilized eggs, bu...Study in Royal Society journal on managing GM crops for environmental benefit
...gainst parasitism. However, as we show, possessing sperm from several males can have negative effects on females. We artificially inseminated females with sperm only from either a single or several males to avoid any direct contact between the sexes. Females re...Research may speed development of new oral drugs for fertility treatments
...es the maturation of ovarian follicles in women or sperm production in men. Insights gleaned from this stru... In the case of FSH, activation stimulates egg and sperm production in reproductive cells. Until now, researchers did not understand key details about how FS...