Bone marrow may be source of new egg-cell generation in adult mammals
...om adult females for the presence of several genes believed to be expressed only in germ cells. "We found that every germ cell marker we could think of was expressed in the bone marrow of adult female mice," Tilly says. "Everyone had missed finding female germline stem cells because they are not in the ovar...New taxon of Galpagos tortoise identified
...oise populations on the island of Santa Cruz, long believed to comprise a single taxon, are in fact, three genetically distinct lineages that are yet to be formally named. While visible characteristics, like the shapes of their shells, were the basis for previous classification of the tortoises, this research...Invasive honeysuckle opens door for new hybrid insect species
... many of them tiny plant eaters and parasites, are believed to be host specialists like Rhagoletis tephritid f... hybrid offspring are short lived because they are believed to do much worse on either blueberry or snowberry than its parents. Schwarz thinks that the introdu...Broccoli packs powerful punch to bladder cancer cells
...led isothiocyanates compounds that the scientists believed play a role in inhibiting cancer. Their hunch was right, at least in the laboratory experiments. There, isothiocyanates hindered the growth of bladder cancer cells. And the most profound effect was on the most aggressive form of bladder cancer they s...Census of Marine Life explorers surprised by diversity, density of Arctic creatures
...sity and diversity of Arctic Ocean creatures, some believed new to science. Sheltered for millennia under a lid of ice currently one to 20 meters thick, unexpectedly high numbers and varieties of large Arctic jellies, squid, cod, and other animals have been found thriving in the extreme cold, thanks to a land...Researchers reveal secret of key protein in brain and heart function
...nd in abundance in the heart and head, where it is believed to play a role in everything from cardiac contractions to memory creation. Results are published in The Journal of Biological Chemistry. Dale Mierke, associate professor of medical science at Brown, said that knowing how a piece of SAP97 is built is ...JCI Table of contents August 1, 2005
...n of cholesterol and fats in the arteries. It was believed that scavenger receptors, including SR-A and CD36, bound to cholesterol, leading to its uptake, and that this was a necessary event in atherosclerosis pathogenesis. To validate this idea, several laboratories created mice lacking these receptors and ...Nerve cells' power plants caught in a traffic jam
..., although they don't live to adulthood. "Everyone believed that mitochondria are essential at synapses -- and this is wrong," said research team leader Konrad E. Zinsmaier, a University of Arizona associate professor of neurobiology at the Arizona Research Laboratories' Division of Neurobiology. "The mutatio...MBL researchers probe how an ancient microbe thrives and evolves without sex
...pensates for, but which often go unchecked and are believed to contribute to mutation (and eventually extinction) in species that reproduce asexually. To learn more about the bdelloid rotifers' unique ability to evolve without sex, Arkhipova and Meselson studied portions of different bdelloid rotifer geno...DDT-resistant insects have additional genetic advantage that helps resistance spread
... prescribe antibiotics." Scientists had previously believed that the genetic 'cost' of resistance would mean that DDT resistance would dwindle once the pesticide taken out of use and DDT-susceptible insects would regain dominance. "Although this assumption is widespread, data to support this contention is ac...Freeze-dried mats of microbes awaken in Antarctic streambed, says U. of Colorado study
...d. As photosynthetic bacteria, cyanobacteria are believed by biologists to be among the first living organisms to colonize Earth. The mats generally are orange or black and consist of 10 to 15 different species of cyanobacteria, she said. Because of a cooling trend in the McMurdo Dry Valleys, some strea...Nutrition scientists take a look at cataract prevention
...saturated fatty acids--two categories of nutrients believed to have health benefits--may both affect cataract development, although not necessarily in beneficial ways. In one study, lead scientist Paul Jacques, DSc, director of the Nutritional Epidemiology Program at the Center, and his colleagues analyzed th...Cells direct membrane traffic by channel width, scientists say
...rystallizing the proteins in the past, researchers believed the channels could be manipulated by inducing the surrounding amino acids to create a hydrophobic or semi-hydrophobic lining required for glycerol passage. Success in doing so could have created new targets for drug therapies. However, it turns out, ...Chemical link indicated between drinking and certain cancers
...s called polyamines that are produced in cells and believed to be involved in cell growth. Using a sensitive chemical analysis technique called liquid chromatography/isotope-dilution mass spectrometry developed at NIST, the team showed that AA reacts with polyamines to produce crotonaldehyde (CrA). This in tu...Nitrogen in the air feeds the oceans
...odesmium," Capone said. "I don't think many people believed him at the time."...Researchers find how some antibiotics kill bacteria
...ng to the rifamycin family. Until now, researchers believed that these antibiotics and their derivatives (there are at least a thousand) all killed bacteria in the same way. But the new study used recent advances in X-ray imagery to obtain the highest resolution figures ever available of how rifamycins bind t...UCLA researchers identify key enzyme linked to childhood blindness
...ngenital amaurosis is an inherited disease that is believed to cause up to 20 percent of all cases of childhood blindness. It is caused by mutations in several different genes including RPE65. An important characteristic of this disease is that the light sensitive rod and cone cells remain intact in the reti...Rockefeller researchers show evidence of asymmetric cell division in mammalian skin
...experiments in cell culture in the 1980s, everyone believed that the epidermis maintained its protective function by ejecting cells from the basal layer and forcing them upward. Our data show that asymmetric divisions occur perpendicular to the basal layer, resulting in one of the two daughter cells being nat...Ships bring alien jellyfish invaders to our shores
...west Australian coastlines. Introduced species are believed to cost the United States $122 billion per year. About 3,000 species of marine organisms are believed to travel the world in ships' ballast water each day. Ships take in water for stability before a voy...Simple sea sponge helps scientists understand tissue rejection
...is colleagues are studying the cells and molecules believed to be involved in the process of tissue rejection....e sponge version but similar in structure, is also believed to have important functions in cell-to-cell interactions, but is hard to study. The ultimate goal of...