Pack rat middens give unique view on evolution and climate change in past million years
...o was the sudden switch from a 41,000-year glacial cycle to a 100,000-year glacial cycle. This shift, caused presumably by interactions among the long-period precessions of Earth's orbital and spin axes and cyclic changes in the shape of Earth's orbit, initiated an abnormally hot and dry period evident in ...It's feast or famine: Predators may drive lemming cycles, Science researchers say
...be solely responsible for the four-year population cycle in eastern Greenland and possibly in many other collared lemming populations. In contrast to previous hypotheses, food or space shortages didn't appear to be involved, the researchers report in their study, which appears in the 31 October issue of th...Fruits offer powerful protection from skin cancer
...to inhibit UVB exposure-mediated increases in cell cycle promoting signals including the activation of cell division. Modulation of Ultraviolet Radiation B Induced Wnt-Signaling by Perillyl Alcohol in Human Keratinocytes (Abstract 1385) Perillyl alcohol (PEOH) is a food additive and a compound found n...FDA approves Raptiva (efalizumab) for chronic moderate-to-severe plaque psoriasis
...estigator. "RAPTIVA has the potential to break the cycle of intermittent therapy by offering patients and their doctors a convenient treatment regimen that can be used continuously." RAPTIVA is a humanized therapeutic antibody designed to selectively and reversibly block the activation, reactivation and t...Young cancer researchers honored
...as switches to control the progression of the cell cycle can both trigger and prevent initiation, dependin...he cell's growth program termed the cell division cycle showing how they control growth and how their mutation contributes to cancer. And last year, Dr. Pa...Clay may have aided formation of primordial cells
...possible, the next problem was how to complete the cycle by persuading these vesicles to divide," said Szos...emical system, we are working on a way to get this cycle to function in a way that is more natural," said Szostak. "Clearly, there are a lot of complicated a...NSF awards $31.9 million in grants to study biocomplexity in the environment
...terials and systems; and tracking heavy metal life cycle pathways....Purdue team solves structure of West Nile virus
...t with another cell's surface so the next invasion cycle can begin. "The West Nile virus is formed from thr...ork will be required to understand the virus' life cycle on the molecular level. "Our structural map now shows only the general orientation of the proteins,"...Stanford research finds gene variations that alter antidepressant side effects
...affects the gastrointestinal tract, the sleep-wake cycle and levels of alertness. The researchers looked at one type of serotonin receptor called 5HT2a, thought to be involved in causing antidepressant side effects. Mirtazapine completely blocks this receptor, so the researchers predicted that variation in......ll animals were maintained on a 12-hour light dark cycle and housed two to a cage. After 10 weeks of treatment, the animals were sacrificed, and renal tissues (cortex, medulla, and papilla) and blood vessels were isolated for the measurements of the synthesis of eicosanoids and expression of CYP enzymes. ...New findings in yeast may reveal why growing older is the greatest carcinogen in humans
...g out," McMurray said. "Toward the end of the life cycle the yeast started slowing down and so I'd get longer breaks, which allowed me to go home and shower and come right back." As the buds sprouted, McMurray would gently pull them away from the mother cells with a needle-like instrument and line them up ...Northern climate, ecosystems driven by cycles of changing sunlight
...pollen from shrubs varied up to 25 percent between cycle peaks. "When there have been high aquatic producti...icting correlations that occurred in aless-defined cycle that occurred between 5,000 and 6,000 years ago, the researchers wrote. The presence of predictable ...Resistance exercise resets the body clock
...ny of the genes that normally altered in a 24-hour cycle were affected by the exercise regime. Exercise increased the expression of genes that are normally 'switched off' in the morning, and reduced the expression of genes that are normally 'switched on' in the morning. In effect, exercise caused a phase s...Hormonal changes in satisfied and dissatisfied shift workers across a shift cycle
...tisfied shift workers was 5.00 vs. 2.42. The shift cycle (comprising 35 days and 5 shift teams) rotated rap... The only significant change across the shift cycle was the lowering of morning levels of cortisol on the last morning shift in the shift cycle. In...Nasal contribution to breathing with exercise: The effect of race and gender
...subject's predicted maximum exercise capacity on a cycle ergometer was determined. While being monitored by...ng incrementally graded submaximal exercise on the cycle ergometer (10% increments from 060% PWCmax for each subject). Each subject was fitted with a nasal ...Prescribed burns can threaten pine Savannah amphibians
...there. New research suggests that the current burn cycle of every two-to-three years decreases the number o...pecies per pond by about half. "A prescribed burn cycle approaching five years should balance the conflicting needs of amphibians and longleaf pines without...Controlling the internal clock in darkness
...patterns associated with these rhythms continue to cycle as well within other clock cells. These sustained expression patterns, however, require intercellular communication between different groups of brain clock cells. In other words, the ventral lateral neurons do not act alone. When the molecular clock ...UGA researchers use transgenic trees to help clean up toxic waste site
...ees, whose larger root systems and year-round life cycle makes them better candidates for long-term cleaning of polluted soil. Phytoremediation is a relatively new field and one gaining international interest. A team of photographers working for National Geographic, for instance, recently spent considerabl...Detecting chemical threats with 'intelligent' networks
...oated with metal oxide films, can be programmed to cycle through a range of temperatures. Airborne chemicals attach to the film in characteristic ways depending on factors such as temperature and film material, causing changes in the flow of electricity through the microsensors. These changes serve as a "s...Scientists find key to ocean bacterium that helps control greenhouse gas
...tion of marine photosynthesis to the global carbon cycle was grossly underestimated. We now know that over 50 per cent of global photosynthetic activity takes place in the oceans. "A 10 per cent decrease in carbon dioxide uptake by the oceans would leave about the same amount of carbon dioxide in the atmo...