Tag: "distributions" at biology news

Smithsonian scientists show differing patterns of rainforest biodiversity

... rigorously tested. Little data exists for species distributions in these vast forests, particularly for insects, which make up a large share of the worlds biodiversity. An international group of entomologists and botanists, including Smithsonian researchers, has assembled data representing 500 species of caterp...

News tips from the Journal of Neuroscience

...ngle AN fibers in anesthetized cats, then used the distributions of the interspike intervals (ISIs) to model sponta...s a homogeneous stochastic process with interevent distributions composed of an exponential and gamma component, with a modification to account for spike refractory ...

A first-principles model of early evolution

...otein Universe. It quantitatively reproduces these distributions pointing out their origin in biased post Big Bang evolutionary dynamics of discovery of new proteins. The number of genes in the evolving organisms depends on the mutation rate, demonstrating the intricate relationship between macroscopic properties ...

Piecing together the cyanobacteria puzzle

...n nitrogen. NanoSIMS provides the ability to map distributions of elements and isotopes with 50-100-nanometer resolution. The device allowed the scientists to measure the carbon and nitrogen uptake and subsequent distribution at the cellular and subcellular level. The method shows the dynamics of resource upt...

Pendulum love, science class gender gaps, musical mind mirrors, and unparticle physics

...alysis reveals a remarkable similarity between the distributions produced by music compositions and brain activity. Brain activity was monitored through an electroencephalograph (EEG), which records electrical signals on the surface of the brain. The musical compositions were analyzed based on the melody, harmon...

Biodiversity loss linked to economic inequality worldwide

...vident in both scales: societies with more unequal distributions of income experience greater losses of biodiversity. "While there is often a trade-off between economic growth and environmental quality," says Mikkelson, "this study suggests that there is a synergy between a different kind of economic developmen...

Drought sensitivity shapes species distribution patterns in tropical forests

...inhabit the forest. Although the patterns of plant distributions in tropical forests have been widely studied, the ... water availability is a direct determinant of the distributions of tropical plant species," said Dr. Mel Tyree, University of Alberta researcher. Although tropica...

Drought limits tropical plant distributions, scientists at the Smithsonian report

...ng of experimental measurements and observed plant distributions across a tropical landscape, drought tolerance predicted plant distributions at both local and regional scales. This mechanism to explain a common observation will contribute si...

AGU Journal Highlights -- April 16, 2007

...uration. Noting that fractal patterns are found in distributions of both watershed pathways and land surface topography, Woerman et al. studied such patterns in Scandinavia, North America, and other watersheds on continental shields. They found that the fractal nature of the land surface topography in riverine and...

A changing climate for protected areas

...sting conservation plans have assumed that species distributions change relatively slowly, unless they are directly affected by human activities, said Miguel Arajo, a co-author of the study. However, our study shows that these strategies must anticipate the impacts of climate change if extinctions are to be reduce...

No need to thank dinosaur-killing asteroid for mammalian success

...r 2, 2006 issue of Nature that examined geographic distributions of nearly 20,000 species of vertebrates, the researchers hope to move away from the prevailing piecemeal conservation strategy to one that maximizes the benefit to the greatest number of species and those most at risk. "The overarching philosophy ...

Biologists produce global map of plant biodiversity

...en that we are far off from knowing the individual distributions of the world's 300,000 odd plant species," says Jetz. "Holger Kreft and I investigated how well the richness of plants can be predicted from environmental conditions alone." Combining field-survey based species counts from over a thousand regions w...

Local range estimation in wild animals

...utational methods have been developed to construct distributions of where such monitored organisms are most likely to be found in space and time using this data, and are much more accurate than previous methods when dealing with large sets of data. Previous methods, called Kernel Methods, were based on associatin...

Hofmeyr skull supports the 'Out of Africa' theory

...nt human populations according to their geographic distributions and genetic relationships. She compared the Hofmeyr skull with contemporaneous Upper Paleolithic skulls from Europe and with the skulls of living humans from Eurasia and sub-Saharan Africa, including the Khoe-San (Bushmen). Because the Khoe-San are r...

Soil nutrients shape tropical forests, large-scale study indicates

...s, challenges the theory that at local scales tree distributions in a forest simply reflect patterns of seed disper...enced where certain tree species grew: The spatial distributions of 36 to 51 percent of the tree species showed strong associations with soil nutrient distributions....

'Diabetes gene' may be linked to polycystic ovary syndrome

...e eight SNPs with PCOS the differences in genotype distributions between the case and control groups were measured. The impact of the differences in age and body mass index (BMI) structures for both groups was also calculated. To better clarify the purported associations between CAPN10 and PCOS the researchers per...

Mode of seed dispersal greatly shapes placement of rainforest trees

...They analyzed the dispersal mechanisms and spatial distributions of 561 tree species found in the plot. What they found was that species clustering was strongly correlated to the species' mode of seed dispersal. Each species was categorized by one of five dispersal methods: ballistic (where seeds are liberated ex...

Ludwig Fund donates $20 million to University of Chicago for cancer research

...an immediate boost to cancer research. Subsequent distributions from the Ludwig Fund over the next seven years should enable each Ludwig Center to build a self-sustaining endowment. The other five Ludwig Centers will be located at Dana-Farber Cancer Institute/Harvard Medical School (Boston, MA), Johns Hopkins U...

Museum-fueled global study shows you can't judge biodiversity by its bird

...tudy gathered enormous amounts of data the global distributions of 9,626 species of birds, 4,104 species of mammals and 5,619 species of amphibians and painstakingly plotted them in small grids to gain a more detailed understanding of where the animals live. Rasmussen, who provided information based on some 230,...

Bacteria increase risk of lower stomach cancer, decreases risk of upper

...is finding may help explain the changing rates and distributions of these cancers in Western countries over the past century. Infection with H. pylori, which is known to cause ulcers, has also been associated with certain types of gastric cancer, but the strength of association varies with where the cancer i...

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(Date:4/16/2014)... the Physical Biosciences Division of Lawrence Berkeley National ... recognized as a leading authority on the evolutionary ... their application to systems and synthetic biology, has ... 2013 Ernest Orlando Lawrence Award by U.S. Energy ... Department of Energy (DOE),s highest scientific honor, is ...
(Date:4/16/2014)... To reproduce or to conquer the world? Surprisingly, ... Ludwig-Maximilians-Universitaet (LMU) in Munich have now shown how ... their species. , The bacterium Bacillus subtilis ... liquids and on agar surfaces by means of ... substrate. Actually, the bacteria proliferate most effectively in ...
(Date:4/16/2014)... Dr. Martin Prechtl, Leo Heim and their colleagues at ... a new method of generating hydrogen using water and ... particular interest when it comes to fuel cell technologies. ... hydrogen production using water and formaldehyde", have recently been ... Among other applications, the new approach can be used ...
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