Tag: "medium" at biology news

Climate change plus human pressure caused large mammal extinctions in late Pleistocene

...illion and 600,000 years ago, the number of small, medium and large mammals in a given community remained fairly stable, though different species may have filled the various ecosystem niches. In the late Pleistocene, however, something happened to make the number of large mammals nosedive continent-wide. Th...

A long-necked sea predator from China described in Science

... and the complexities of hunting in water, a dense medium that can alert prey to a predator's presence long before it strikes....

Winner of 2004 EMBO Science Writing Prize announced

...d that he had long been looking for an appropriate medium to communicate this fascinating story. "It was really my brother-in-law who gave me the James Bond idea. After hearing the whole bizarre story of the glowing squid, his immediate response was that it sounded like a scene from a James Bond film. That ...

Shedding new light on biology

...sts to view relatively large samples (2-3 mm) in a medium that mimics real conditions, rather than cutting-up and destroying the sample to fix it to a slide (as needed in traditional microscopy). SPIM shines a very thin slice of light through the sample and then systematically moves the specimen through the...

New study to investigate demise of coral reef ecosystems

...udies to look at the effects of bleaching over the medium to long-term and the first at such large scale. Project leader, Dr. Nicholas Polunin, of Newcastle University's School of Marine Science and Technology, said: "Coral bleaching is predicted to increase in frequency in the coming decades and a recen...

Environment influences learning: U of T study

...ith starvation. If a worm was returned to the salt medium where it had been trained, it showed a distaste for the benzaldehyde odour, but it did not demonstrate this memory in a different salt medium. Law likened the results to remembering something more easily if you were in the same environment where you...

Changes to insect-seeking calls of horseshoe bats may drive new species formation

...z. They found the large form calls at 27 kHz, the medium one at 40.5 kHz, and the small one at 54 kHz, each frequency a mathematically precise permutation of the basic 13.5-kHz frequency. These harmonic differences, according to the researchers, determine the type of insect any one size of large-eared hor...

2004 BP Conservation Programme winners pave the way for protecting wildlife

...o make clarinets and oboes in the West, and is the medium of choice for skilled local wood-carvers. Using the Mpingo as a flagship, the team will work with foresters to develop sustainable forestry under the management of local communities, and thereby conserve large areas of forest and woodlands in southe...

Physics tip sheet #42

...city. They will demonstrate that in a "slow-light" medium in which light travels at about one percent of c, ...group, in which they showed that in a "fast-light" medium where a light pulse propagates faster than c, the information travels slower. (Paper S3 11, www.aps...

Are nanobacteria alive?

...ed the nanoparticles self-replicating in a culture medium and claimed to have identified a unique DNA sequen...sorder did not do this, nor did the density of the medium change if no filtrate was added. Some of the particles were removed, cleaned of their mineral coatin...

ESA's minature Earth observer put to many uses

...thin many ecosystems such as boreal forests low to medium intensity fires are actually beneficial, reducing fuel loads and stabilising the environment. However high intensity fires can be more destructive, leading to destruction of the dominant plant species, soil degradation, increased water run-off, flood...

Scientists report how protons induce water cages

...lexibility of water molecules that makes water the medium of choice for biological systems. The study examin...ively participating in chemical change. It is the medium for shuttling protons. Individual water molecules become part of a network or wire that guides the f...

NASA-inspired technology may help preserve women's future fertility after cancer treatment

...device designed to gently agitate a special growth medium just enough to prevent follicles from settling on ...culture conditions. Follicles cultured in a growth medium that included FSH using the NASA-inspired techniques developed larger diameters, growing at roughly ...

Tips from the Journals of the American Society for Microbiology

... "This solution is known to be a good nutrient medium for microorganisms, and their growth in the sap will eventually effect the quality of maple syrup and other end products," say the researchers. Bacterial contamination of maple sap usually occurs at the taphole. In the study, samples of sap were...

Young chimpanzees show sex differences in learning

...hort distance (up to three chimp fist widths) to a medium distance (three to five fist widths) and a long di... tools a short distance 80 percent of the time and medium or long distances each 10 percent of the time, her daughter did the same. Sons spent less time watch...

Physics tip sheet #41 - April 5, 2004

...osite to the usual direction as they pass from one medium to another, attracted a lot of attention when it was demonstrated for electromagnetic waves in so-called left handed materials. The effect has now been observed in liquid surface waves. The authors of this paper placed an array of copper cylinders in...

Heinz Maier-Leibnitz prizes 2004

...f the project "Religious charisma as the motor and medium of religious communication", part of the DFG Collaborative Research Centre "Norm and Symbol". Dr. Volker Springel (33), Astrophysics, Max Planck Institute for Astrophysics, Garching Volker Springel's research interest is in the area of cosmology. H...

Lakes with zebra mussels have higher levels of toxins, MSU research finds

...t that zebra mussels promote Microcystis at low to medium phosphorous levels not at very low or very high phosphorous levels," he said. "However, we're still not sure why this happens." Zebra mussels have been causing problems in the Great Lakes since the late 1980s. For example, in Lake Erie, Sarnelle sai...

DFG establishes 14 new research units

...s special in this instance is that the surrounding medium is affected by the light beam only to such an extent that this light beam itself experiences optimal propagation conditions. Engineering Sciences Today light-weight materials are being used in many areas and will play an increasingly important role...

DHEA boosts growth rate of human neural stem cells

...se in new brain cells compared to cells grown in a medium with the same factors, but without DHEA. "We saw such a pure effect of DHEA," Svendsen says. "It's the only steroid we tested that had such a direct effect on stem cell growth and new neuron formation," according to Suzuki. The new work is important...

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