Chromosome rearrangements not as random as believed
...high frequency of new translocations in the DNA of sperm samples from healthy individuals. (For technical r... highly unlikely to be affected. Approximately one sperm in 100,000 has the rearrangement, so the chance of an affected sperm fertilizing an egg is exceeding...Penn clinical chemist wins prestigious Ullman Award
...n microchips, including immunoassay, assessment of sperm motility, and DNA amplification. Today many laboratories and companies have research and development programs based on Kricka's discoveries. "What we wanted to do was miniaturize and simplify testing," said Kricka. "These chips can be used at the po...Truly informed consent must include talking about future fertility, warn experts
...hat for post-pubertal males diagnosed with cancer, sperm banking is a relatively straightforward procedure ...ions. There are specific problems associated with sperm banking; for instance, consent forms that may be incomprehensible for adolescents and which raise th...New male contraceptive clears hurdle
...SUG study, doctors inject a gel into the tube that sperm travel through after they are produced (known as the vas deferens). The gel then disables the sperm as they swim by. In study animals, male fertility returns if the RISUG is flushed out with another i...One big biology question solved
...gy's most fundamental questions why males produce sperm and females produce eggs. The finding is a break...ives of Vitamin A trigger the beginning of egg and sperm production, a process known as meiosis. The cells that eventually turn into either eggs or sperm k...Increased environmental carbon levels the good news!
...ecule, adenylyl cyclase (AC), that can then affect sperm motility or the virulence of a dangerous human pat... send a cascade of signals that regulate mammalian sperm motility in response to Ci a consequence that has implications for human reproduction, perhaps in ...Understanding the life of C. elegans
...legans that lack germline cells those cells like sperm and egg in animals are necessary for reproduction. In a related work published in Cell (Motola et al. 2006), the chemical identification of the DAF-12 ligands as steroid-like hormones is reported, providing the first evidence for steroid control of...'Scent of a woman' tells male redback spiders to find a mate
...ir life -- into it. In the process, they deposit a sperm plug -- a small part of their copulatory organ that stays inside the female -- that prevents any future males from successfully fertilizing her eggs, meaning that males have to mate with a virgin to maximize their reproductive success. "On the one ha...2006 annual meeting of the Society for the Study of Reproduction
...s pheromones, obesity and reproduction, generating sperm from human testicular stem cells, and new concepts of puberty....Insects that produce males from unfertilized eggs reveal a surprising cellular feat
...ular component that is ordinarily derived from the sperm after fertilization. A new study led by researcher...lized they don't use them--the centrosome from the sperm is used preferentially." Centrosomes remain somewhat mysterious structures, Ferree said, but researc...Hormonal male contraception reversible after few months for all men
...ulation suppression by hormone treatment in women, sperm production can be fully inhibited by androgen or a... men. With such hormone treatment, azoospermia (no sperm in ejaculate) or severe oligozoospermia (less than 3 million sperm per mL of semen), which is suffic...'Cellular antennae' on algae give clues to how human cells receive signals
...many functions on human cells; they propel egg and sperm cells to make fertilization possible, line the nose to pick up odors, and purify the blood, among other tasks. With such a range of abilities, cilia serve as both motors and "cellular antennae," said Dr. William Snell, a professor of cell biology at...Eminent inventor of DNA fingerprinting gains new recognition
...cal father of a child? Whose blood, sweat, hair or sperm has been left behind at the scene of a crime? Who is this tsunami victim? Are these bones truly the remains of the last Czar of Russia? Jeffreys' technique was even able to tell us whether Dolly was in fact the clone of another sheep. "The new discip...New male contraceptive targets sperm, not hormones
...vice (IVD), a nonhormonal contraceptive that stops sperm in their tracks. The study, to take place in Seatt...oncept is pretty simple: A set of tiny plugs block sperm as they travel through a tube called the vas deferens. Men don't need to worry that they'll have ac...What controls stickiness of 'smart' chromosomal glue
...erstanding of the process cells use to ensure that sperm and eggs begin life with exactly one copy of each ...he specialized cell division process that produces sperm and eggs enabling them to separate properly. The researchers, led by Howard Hughes Medical Institu...ACS weekly press package — May 1st, 2006
...g their journey towardthe egg. Research shows that sperm turn in response to chemical signals, aprocess ter...perm chemotaxis may be a cause of infertility, and sperm chemotaxis couldpotentially be used as a diagnostic tool to determine sperm quality to treatmale inf...Even when faint, ovary scent draws sperm cells
...ton report biochemical machinery that allows mouse sperm cells to follow the weakest of scents. Even when ovary extracts were diluted 100,000 times, some sperm cells still found their mark. A video demonstrating sperm chemotaxis (oriented motion in response t...Viral hitchhiker inhibits Wolbachia bacteria's ability to proliferate
...proliferate. One way it does this is by hijacking sperm of its insect hosts and genetically tricking them to bear more infected females, the only sex that transmits the bacteria. Now, a new study from the MBL (Marine Biological Laboratory), published in the May 18 issue of PLoS Pathogens, demonstrates th...