Nature's ambush: pregnancy more likely from single unprotected intercourse than believed
... during the six most fertile days of the menstrual cycle and peaked at ovulation despite the fact that the...r earlier research showing six days in a menstrual cycle when a woman can become pregnant the five days up to ovulation and the day of ovulation itself. It'...Synthetic hormone used in contraceptives and HRT produces negative effects in monkey studies
...the estrogen/MPA regimen for 21 days, the standard cycle for women who take contraceptives. "Dr. Pazol's Yerkes-based animal studies provide a critical link to better understanding of HRT and its behavioral-related effects," says Mark Wilson, PhD, a study co-author and chief of Yerkes' Psychobi...UC Riverside researchers discover new way to identify cell growth
...lay of proteins that control and regulate the cell cycle has relevance for the diagnosis and treatment of cancer. Sauer said that he and his colleagues have celebrated the result of a long research effort. "We had a very nice bottle of Champagne. Yes, this is a very important step towards our goal to unde...Other Highlights in the June 2 JNCI
... to suppress expression of the gene for a key cell cycle regulator in a mouse model appears to silence the ...xpression of polo-like kinase 1 (PLK1), a key cell cycle regulator that is overexpressed in some human tumors, and inhibit tumor growth in vivo. Levels of P...Concerns remain about UVB damage to amphibians
...y assumptions about how UV-B radiation in the life cycle of one species would relate to other species, and fail to understand the natural behavior of amphibians and their evolution, the researchers said in their Ecology article. "For instance, some researchers have now theorized that amphibians could avoi...Unexpected changes in Earth's climate observed on the dark side of the moon
.... Earthshine observations through an 11-year solar cycle will also be important to assessing hypothesized influences of solar activity on climate." Montanes-Rodriguez says that to carry out future observations, the team is working to establish a global network of observing stations. "These would allow cont...UW-Madison scientists find a key to cell division
...s, the proteins found during that time in the cell cycle would be crucial elements in understanding how the process works." The next step was to inactivate each protein in a developing embryo. If a defect occurred, it would mean that the inactivated protein is essential for normal development. "We used...Molecular image of genotoxin reveals how bacteria damage human DNA
... of themselves, cells exposed to CDT go into "cell cycle arrest." While some CDT-invaded cells continue to ...ays that CDT-containing bacteria might induce cell cycle arrest because it stops cells from being sloughed off in areas such as the intestines where bacteria...JCI table of contents, 17 May 2004
...manifests as diabetes due to lack of insulin. Cell cycle assays showed increased proliferation and apoptosis in the double-knockout mouse cells. These results suggest the involvement of E2F1 and E2F2 in the maintenance of differentiated cells in the pancreas and support their distinct role as transcription...High Flux Isotope Reactor marks 400th cycle
...s marking a milestone this month -- its 400th fuel cycle since it began operation in 1966. A fuel cycle represents the time -- about 25 days -- it takes for the reactor's uranium fuel to become depleted. ...NIH funds new Boston College-Boston University study of B-1a cell associated with leukemia
...ously demonstrated that the rules that govern cell cycle control and differentiation to immunoglobulin-secr...anisms that control when B-1a cells enter the cell cycle and proliferate. Insights from these studies will help us understand the molecular basis of several ...Plant-like enzyme acts as key life cycle switch in malaria parasite
An essential switch in the life cycle of the malaria parasite has been uncovered by researchers in England, Germany and Holland. They have established that to infect mosquitoes that transmit malaria, the parasites depend on a type of molecule normally found in plants, which they have nam...Artificial light-dark cycles expose circadian clocks at odds with each other
...er. "When you travel to Europe, the rest-activity cycle will adjust relatively quickly. In two or three da...alf of the brain's main circadian clock can show a cycle of nearly 25 hours, which is normal for a rat, while the bottom half adjusts according to external s...Model shows long-held constant in ocean nutrient ratio may vary as ecological conditions change
... big role in biogeochemical cycles -- how elements cycle through the biosphere. Phytoplankton have a main role in the carbon cycle. They need carbon dioxide to grow, so they suck it out of the atmosphere, controlling its presence there. And that ties into global climate." Klausmeier believes his study con...Using science to restore habitat for declining species
...rican mussels. Mussels have a complex reproductive cycle that often requires a specific fish to serve as a host for the parasitic larva stage. Through painstaking research and underwater photography, SRS researchers Wendell Haag and Mel Warren are revealing the methods that mussels use to lure specific fis...Archaeologists announce discoveries at the ancient Maya site of Waka' in northern Guatemala
...nment and non-government agencies trying to halt a cycle of destruction in Guatemala's largest national park, Laguna del Tigre. The ancient Maya center, known from ancient Maya inscriptions as Waka', and known today as El Per, was once an important economic and political center of the Maya world and forme...Plankton may influence climate change says UCSB scientist
...Toole and Siegel's research. They describe how the cycle begins when the ocean gives off DMS to the lower atmosphere. In the air, DMS breaks down into a variety of sulfur compounds that act as cloud-condensing nuclei, leading to increased cloudiness. With more clouds, less sunlight reaches the Earth and th...Unnatural light-dark cycles expose duelling circadian clocks
... night schedule, while the other followed a longer cycle (>24 hrs.), but both clocks controlled behavioral rhythms within an individual animal. The researchers, Horacio de la Iglesia and William Schwartz of the University of Massachusetts Medical School in Worcester, collaborating with Trinitat Camb...Molecular mechanism found that may improve ability of stem cells to fight disease
...the discovery of a molecular mechanism in the cell cycle that appears to impact the replicating ability of ...e inhibitors" that are critical inhibitors of cell cycle control. In the study, Dr. Cheng and his team isolated p18-deficient stem cells from mice and found...The cicadas are coming, the cicadas are coming: Research on 'Brood X' cicadas focus of briefing
...ich appears to have originated from a 17-year life cycle species. Who: Scientists from Indiana University at Bloomington; Indiana State University; and the University of Connecticut: Biologist Keith Clay, Indiana University, Bloomington Geographer James Speer, Indiana State University Geographer John...