Tag: "variability" at biology news

Study: fertilized lakes less stable than previously thought

...t throughout the experiment. "By comparing algal variability before and during experimental fertilization, we h... human activity that causes increased year-to-year variability will also cause increased unpredictability. Consequently, if fertilization increases variability in ...

Microscopic bone evidence supports dinosaur-bird evolution link

... samples allowed the researchers to understand the variability among species, making it easier to draw conclusion...e scientists didn't have the breadth of data about variability in those bone structures. "There aren't any textbooks that show this," he said. The debate over bird...

150-year global ice record reveals major warming trend

... the 184 ice records from 1950 to 1995, showed the variability in freeze and breakup dates increased in the last three decades. Magnuson says it might be related to intensification of global climate drivers such as the El Nino /La Nina effects in the Pacific Ocean. Magnuson says the ecological effects of global ...

Warming trend seen in late freeze, early thaw of northern waterways, say Science researchers

...arch has confirmed an increase in the year-to-year variability of Northern Hemisphere freeze and ice breakup dates during the last half of the 20th century. An increase in extreme climate events like the recent powerful El Nio-La Nia cycles, Magnuson suggested, may be behind this rise in variability. "One of...

Report on dietary supplements containing ephedra makes urgent call for research to develop dose guidelines, safety warnings

...hedrine-containing products are sold, with a great variability in the accuracy, completeness and adequacy of labels citing ingredients and potential adverse health effects, Haller and Benowitz say."There must be more FDA regulatory control," Haller said. First, uniform product labeling should be enforced, with a...

Fossil teeth of extinct North American rhinos reveal an aquatic lifestyle similar to modern hippos

...Clementz took a different approach, looking at the variability of isotope compositions within populations rather ...the technique to Teleoceras. "We found very low variability in aquatic mammals, including dolphins, seals, and river otters, versus much higher variability in l...

2000 FALL MEETING: updated press conferences, press registration, and other information

...ion (TRMM), because understanding rainfall and its variability is crucial to understanding and predicting global weather and climate changes. Some of the new results are surprising. For example, storms over the interior of the Amazon rain forest resemble ocean storms more than typical continental storms. Also, A...

Lake Titicaca study sheds new light on global climate change

...r in nature that we don`t know much about. Natural variability can be enormous, so we`d better get a full understanding of how these systems work before we try to tease out the impact of humans on climate change.``...

Tallgrass prairies may provide early warning of climate change

...all," Knapp said. "If rainfall patterns change and variability changes in the future as predicted by climate mod...a simple prediction. If the greatest precipitation variability from year-to-year occurs in deserts and deserts are the most water-limited biomes, then plant grow...

Atmospheric aerosols impact on smog formation being reassessed

... Lab team's work has yielded new insights into how variability in the solar flux and the concentration of aerosol...hemical reactions that form smog." CARB designated variability in sunlight and its effect on photochemistry as one of the areas needing improvement in current air ...

Like grapefruit, sour oranges boost drug effectiveness, scientists find, and also why

...for making the drugs stronger. "Because of the variability involved in grapefruit juices, everyone has been trying to figure out what causes the effect so that we can add that compound directly to pills instead," Watkins said. "Our prior research suggested that a compound called DHB (dihydroxybergamottin) wa...

Drug resistance found to vary by ethnicity

...owing this, we should be able to help decrease the variability in the way people are treated." Previous studies have shown that there are ethnic and racial differences in the ability to make several proteins important for successful drug therapy. "So its always been an interest of mine not to confine my investi...

URI oceanographers discover how planetary waves affect phytoplankton production

...ans, are associated with five to 20 percent of the variability in chlorophyll concentration. The scientists theor...dded Uz. "The ocean removes enough carbon that any variability in this uptake has significant impact on the projections of global warming. We do not know enough ab...

Seabirds still not recovered from Exxon oil spill

...blame. "Lingering effects of the spill and natural variability appear to be acting in concert in delaying recovery of the bird populations," he says....

Study finds wind, currents play key role where young fish settle

...with ocean physics to further the understanding of variability in fish populations. While this study emphasized the role physical factors play in a fish's life, Jackson said, it is a collaborative effort with biologists Scott and Joan Holt of The University of Texas Marine Science Institute, Port Aransas. Biolog...

Penn study finds signs folic acid and Vitamin B12 may lessen some ill effects of SMA

...tivelynormally until late in life. Until now, this variability has been attributedto "genetic modifiers" but the present study raises the possibility that itis influenced, perhaps to a significant extent, by nutritional factors. Individuals afflicted with SMA have a genetic deficiency in a protein calledSMN (su...

Climate sensitivity may be higher than many think, researchers say

...The researchers found that, as a result of natural variability and uncertainty in the radiative forcing, the climate sensitivity could lie between 1 and 10 degrees Centigrade. "Consequently, there is a 54 percent likelihood that the climate sensitivity lies outside the IPCC range," Schlesinger said."Our results...

Cardiovascular system holds a key to circadian clock

...ombine with existing knowledge to adjust circadian variability in drug response to the needs of a particular patient." The findings will be published June 29 in the Journal Cell. "If one understands exactly which component needs to be regulated to reset the biological clock, one can target just that co...

Science researchers report 'extremely unstable' gene expression in cloned mice

...searchers. This research suggests that extreme variability in gene expression may be the hallmark of embryonic stem cells, noted Jaenisch. The researchers are interested in finding out whether the epigenetic state of human embryonic stem cells cultured for clinical applications will be as unstable as th...

ESA announces award winners for 2001

...urbance and ecological response to decadal climate variability in the American Southwest. The William Skinner Cooper Award is given annually to honor an outstanding contribution to the fields of geobotany and/or physiographic ecology. Swetnam is currently Director of the Laboratory of Tree-Ring Research at the...

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