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Tag: "estimate" at biology news

MU researchers to study the status of black bears in Missouri

...ct DNA from the hair follicles and use that DNA to estimate the number of bears, the gender ratio of male to female bears, where the bears are migrating from and if they are reproducing. “This study is a good example of the use of cutting-edge molecular biology in the management of Missouri’s wildlife,” E...

Scientists close in on missing carbon sink

...year, which is almost 1 billion tons less than the estimate produced by the computer models. The scientists also found that intact tropical ecosystems are a more important carbon sink than previously thought. The models had generally indicated that tropical ecosystems were a net source of 1.8 billion tons ...

Antarctic icebergs -- Hotspots of ocean life

...some 4,300 square miles of ocean -- the scientists estimate that overall the icebergs are raising the biological productivity of nearly 40 percent of the Weddell Sea’s area....

Arctic ice retreating more quickly than computer models project

...del projections may in fact provide a conservative estimate of future Arctic change, and that the summer Arctic sea ice may disappear considerably earlier than IPCC projections," says Stroeve. Thirty years ahead of schedule The study indicates that, because of the disparity between the computer models...

Corals -- More complex than you?

...o yet. "Based on the rate of gene discovery, we estimate that corals have as many as 20 or 25,000 genes, compared with the human complement of 20-23,000." Why a simple creature should have such a huge genetic repertoire is a mystery, but scientists are excited by it because corals are near the root of t...

New technique will produce a better chromosome map

...yze the images. "Our system will give an impartial estimate of the band location. It will not be researcher-dependent. It will be objective." To improve chromosome spreading, researchers use a rotary tool that vibrates the coverslip surface for several minutes. A simple mechanical vise applies up to two to...

DNA analysis suggests under-reported kills of threatened whales

...tually much greater than is being reported." To estimate the true number of whales in trade, the researcher...hough capture-recapture analysis is widely used to estimate the abundance of living whales in the while, it had not previously been used to estimate the number ...

Rapid response was crucial to containing the 1918 flu pandemic

...ey found to have the most effective measures, they estimate that deaths would have been 25 percent higher had city officials not implemented their interventions when they did. But had San Francisco left its controls in place continuously from September 1918 through May 1919, the analysis suggests, the city mi...

Paper challenges 1491 Amazonian population theories

...pulation estimates were 1 million, in the 70s that estimate drifted up to 4 million; and in the 1990s drifted up to 10 million. "We've now got a polarized community," he says. At one end, he says, is Anna Roosevelt of the Field Museum in Chicago (she argues for large populations dispersed throughout Ama...

Despite their heft, many dinosaurs had surprisingly tiny genomes

...riation in genome size across animal species. They estimate that active repetitive DNA might have comprised an average 12 percent of the ornithischian genome but just 8.4 percent of theropod genetic constitution. The work indicates that the small genomes typically associated with birds -- whose genetic com...

Human's ecological footprint in 2015 and Amazonia revealed

...ct of affluence. In the study Dietz and colleagues estimate the relative importance of the hypothesized drivers of environmental impact at the nation-state level. They then utilize their results to project future levels of stressors. Restricting their data to countries of at least one million people, Diet...

How fish species suffer as a result of warmer waters

...entirely on statistical data. However, in order to estimate future changes, it is essential to develop a deeper understanding of the effect of water temperature on the biology of organisms under question. A new investigation, just published in the scientific journal Science, reveals that a warming induced def...

Fitness has fallen since the days of Ancient Greece

...ering the ship over a range of different speeds to estimate the efficiency of the human engine of the warship.... these texts were originally collected and used to estimate sustainable ship speeds in The Athenian Trireme (CUP, 2rd edition 2000), which Professor Rankov co-a...

Saving endangered whales at no cost

...anadian Fishing Area. Accordingly, the researchers estimate that the number of traps used in Maine is 13 times...rmined by patterns of whale sightings, the authors estimate that, in terms of impact on right whales, each lobster caught in Canada has less than 1% of the impa...

Procedure predicts embryos most likely to result in pregnancy

...-vitro fertilization is the inability to precisely estimate the reproductive potential of individual embryos," Seli said. "The successes of in-vitro fertilization often result from simultaneous transfer of multiple embryos with the hope that at least one will lead to a pregnancy." By comparing the content ...

Map predicting spread of avian flu

... foot-and-mouth outbreak in the UK. The method can estimate the key parameters which determine the spread of highly transmissible animal diseases between farms. These risk maps identify geographic areas in which a given intervention strategy fails to control the spread of the disease between farms. "The risk ...

Growth hormone is not the anti-aging bullet for healthy adults

...usands of adults use GH as an anti-aging drug. One estimate is that 20,000 to 30,000 adults used it for anti-aging purposes in the United States in 2004. The Web is replete with ads for all kinds of products said to contain GH, from pills, sprays, injections, secretagogues, homeopathic formations, and GH r...

Gene expression test reveals ER and HER-2 status of breast tumors

...oping an integrated single genomic test that could estimate the risk of cancer relapse after surgery, determine the ER and HER2 receptor status, and also gauge the sensitivity of the tumor to hormone therapy and chemotherapy," says Lajos Pusztai, M.D., Ph.D., associate professor in the M. D. Anderson Departme...

Antivirals effectively curb influenza virus

...onducted from 2000 to 2004, which were designed to estimate the effect of post-exposure antiviral treatment on preventing influenza within households. Two of the trials were conducted with zanamivir and two with oseltamivir, permitting comparisons to be made between the two. The trials covered a total of 1,4...

Sunshine pill for prostate cancer in 2009

... find them. But this does not give you an accurate estimate of how many people will go on to develop advanced disease. In fact death rates are going down, which means that the market for this drug is probably pretty static.' James also points out that it is far from certain that the Phase III trials will ...

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