Single molecular 'mark' seen as pivotal for genome compaction in spores and sperm
...nformation is passed from parents to offspring via sperm or eggs, also known as gametes. In some single-cel...tists saw the same activity during the creation of sperm in fruit flies and mice, suggesting that the mechanisms governing genome compaction are evolutionari...Earth's most diverse marine life found off Indonesia's Papua Province
...ng area in the world, and migratory populations of sperm and Bryde's whales, orcas and several dolphin species. "We're thankful to the Ministry of Forestry and CI for the significant data from these surveys, and we are excited to be planning further surveys in 2007 to fill in remaining data gaps that wi...UVA studies potential target for skin cancer treatment
...are normally active in the male testis at the time sperm are formed. The genes, called cancer-testis anti... "The SPANX proteins appear at the last stages of sperm production, " explained Anne Westbrook, Ph.D., lead author of the study and a researcher in UVa's de...Male contraceptive study expands to 4 US cities
...rnative to vasectomy. The new device aims to block sperm by plugging the tube they travel through (called t...in two tiny, soft silicone plugs per side, and any sperm that make it past the first plug are stopped by the second. It's not rocket science, but it seems to...Evolutionary first: Parasite reaches beyond host to play havoc with others' sex lives
... from reproducing. The parasite somehow alters the sperm of its male host, rendering matings between infected males and uninfected females infertile. If, however, the male mates with an infected female, their offspring are viable, helping spread the infection to all members of the species. In Jaenike's fli...Environmental toxicology experts to convene at Penn symposium
...preterm birth 11:20 Toxicoproteomics: Assembling a sperm tail 11:40 Biomarkers: Mesothelin as a marker for mesiothelioma 12:00 Lunch 1:30 Collaborative Research with Environmental Health Science Centers 2:00 Translational Research and Environmental Medicine 2:30 Grants and Initiatives in Environmental ...Why the best things come to those who wait
...hose who have gone before, he can 'fast-track' his sperm to the front of the race to the egg. 'The prese...r. 'When the first male mates with the female, his sperm are released into a fairly hostile environment. But, by the time the last male mates, the presence o...Protein important in blood clotting may also play a role in fertility
...d other cell functions is also critical for proper sperm formation in mice, according to researchers from t...ave smaller numbers of the cells that give rise to sperm and produce no mature sperm at all, the researchers found. Female mice missing CIB1 were fertile, as...Looking to a new era in bee research
...o the remarkable longevity of queen honey bees and sperm stored in the spermatheca. The HBGSP has united a broad range of scientists, from leaders in human genomics and bioinformatics to members of diverse disciplinary and organism-based communities, including those studying mammals and humans. A total ...Lack of GBA2: A contraceptive for male mice
...2 showed decreased fertility. This was because the sperm from these mice had abnormally large, round heads,...nd were fewer in number and moved more slowly than sperm from normal mice. Individuals lacking the GBA2 related protein GBA1 suffer from Gaucher's disease (...JCI table of contents: Nov. 1, 2006
...2 showed decreased fertility. This was because the sperm from these mice had abnormally large, round heads,...nd were fewer in number and moved more slowly than sperm from normal mice. Individuals lacking the GBA2 related protein GBA1 suffer from Gaucher's disease (...Decoded sea urchin genome shows surprising relationship to man
...l properties such as ease of isolation of eggs and sperm and transparent embryos, a valuable model to study the process of development and help understand human development. The development of the animal occurs through a complex network of genes, and the sea urchin is one of the main models for systems bio...Sea urchin genome is a biology boon and a computational feat
...the burst of biological activity that occurs after sperm and egg merge. In just one month, a human embryo has produced thousands of cells that form all the major organs as well as the general body plan of head, torso and limbs. The urchin's usefulness as a model system for developmental biology was a key r...Sperm proteome gives 'tantalizing glimpse' towards the origin of sex
...alogue of the different types of proteins found in sperm could help reveal the origins of sex and explain s...e Genetics today describes 381 proteins present in sperm of the fruit fly, Drosophila melanogaster. Whilst more proteins may be identified as research progr...First Far Eastern leopard captured in southeast Russia by international team
...of medical evaluations including the collection of sperm to asses its capacity to reproduce. Genetic analyses, used in conjunction with other bio-medical evaluations, will be used to determine whether leopards and tigers suffer from the effects of inbreeding by closely related individuals, a common proble...Scientists discover role for dueling RNAs
...into germ-cell spores that, like mammalian egg and sperm cells, have half the number of chromosomes. Yeast spores withstand this harsh environment far more ably than the larger cells from which they originate. But in some cases, flipping the meiotic switch can be catastrophic. If a cell with only one co...Exposure to dioxins influences male reproductive system, study of Vietnam veterans concludes
...ast several decades. These include a decrease in sperm production by almost 50 percent, a three- to four-fold increase in testicular cancer, an increase in the incidence of cryptorchidism (undescended testes, a condition where the testes are not in their normal location in the scrotum) and hypospadias (a...Humpback whales have brain cells also found in humans
...ee bottlenose dolphins, an Amazon river dolphin, a sperm whale, two beluga whales, a killer whale and sever...cies, it is important to note in this context that sperm whales, killer whales, and certainly humpback whales, exhibit complex social patterns that included ......ll replicates and then divides twice, resulting in sperm or eggs with just one set of chromosomes each. For meiosis to work properly, corresponding chromosomes must first identify each other, then line up accurately and stay together during the recombination process. Different organisms use different metho......tacks. "Even though just one male provides all the sperm that a queen needs for the rest of her life, queen honeybees go out on mating flights and obtain sperm from a dozen or more males," said lead author Thomas Seeley, Cornell professor of biology and chair ...