Tag: "fixation" at biology news
Unicellular organisms contribute more nitrogen to ocean that reported earlier
...nput of nitrogen that exceeds the rate of nitrogen fixation
measured for the cyanobacteria Trichodesmium (trad...broad areas of the ocean." This level of nitrogen fixation
in the Pacific Ocean alone accounts for about 10 percent of the total global oceanic new production ...
Biocompatibility to widen scope of biomaterial applications
... fusion technology such as cages, bone grafts, and fixation
devices attain maturity in terms of providing positive clinical benefits. Growing understanding of complex biological materials and development of novel biomaterials designed at the molecular level to meet specific medical applications are likely to ...
Brain cells become more discriminating when they work together
... used by our organic computer. The reason for this fixation
was evidence that the firing rates of sensory neurons contain important information. For example, the higher the firing rate of the pain-sensing neurons in the back of your hand, the greater your brain's perception of pain in that location. "We are...
Scientists develop new cloning technique that dramatically shortens the search for genes
...te the matching gene on the plant's DNA. Nitrogen fixation
In the PNAS experiment, Mitra and her coworkers u...trogen from plants, which makes bacterial nitrogen fixation
essential to all animal and human life. "Our lab has a particular goal to identify the genes that...
Tools from the Human Genome Project reveal a versatile microbe
...which improves fertility. A by-product of nitrogen fixation
is hydrogen, which can be used as fuel. Almost every bacterium that fixes nitrogen has just one nitrogenase enzyme. So, the researchers were surprised to find that R. palustris had genes not only for the standard nitrogenase, but also for two add...
Scripps team part of collaboration that reveals first ecological genomic 'blueprints'
...e really going to help us understand global carbon fixation
and global element cycling--these are keystone organisms in marine ecosystems." The Center for Marine Genomics at Scripps is a new center that will examine the genomes of diverse marine organisms to understand their adaptations to the marine enviro...
Genomes of tiny microbes yield clues to global climate change
...ch year as much as two-thirds of the total carbon fixation
that occurs in the oceans. Patrick Chain, a biolog...l and genetic controls of photosynthesis, nitrogen fixation
and carbon cycling." The sequencing wasfunded by the DOE Office of Science's Office of Biological an...
Increasing carbon dioxide relieves drought stress in corn, researchers say
...ide concentration of 550 parts per million, carbon fixation
in the leaves indeed rose in association with grea...e end of a dry spell in June, Leakey found, carbon fixation
increased under elevated carbon dioxide as much as 41 percent. Since carbon dioxide serves to close ...
Passing its global sight test leaves MERIS ready for work
...d chain up to fisheries, and it also regulates the fixation
of carbon dioxide by photosynthesis." The latter is a key variable in global warming. The optical properties of the ocean and phytoplankton populations were measured with surface and submersible instruments. And as with all readings carried out on...
Study provides new insights into the functional neuroanatomy of motor imagery
...g overt movement. Visual Fixation Task: A visual fixation
task was employed as a baseline condition for the ...for 750 ms at a rate of 0.67 Hz. During the visual fixation
task, subjects were asked to clear their mind and withhold any movement except for physiological one...
Study finds controlling phosphorus pollution in wetlands more important than believed
... land, phosphorus fertilization increases nitrogen fixation
by "symbiotic" bacteria residing in plant roots. T... bacteria that reside there to "shut down nitrogen fixation
instead of promoting it," he said. At Duke, Sundareshwar has designed a new course on the biogeochem...
Even green pond scum can suffer from jet lag
...ed organism to combine photosynthesis and nitrogen fixation
because the two processes are biochemically incompatible. The Taiwanese discovered that the tiny organisms had solved this problem by inventing the practice of moonlighting: They photosynthesize all day and then fix nitrogen after dark. "When those o...
Three inferior prefrontal regions of the brain found receptive to somatosensory stimuli
...tention task. In both conditions subjects viewed a fixation
point and received somatosensory stimulation. In o...stimulation and to passively fixate on the central fixation
point; and count the number of times the luminance of the central fixation
point dimmed and to ignor...
Six reporters named to receive 2002 AAAS Science Journalism Awards
...s piece opens with researcher Fernando Nottebohm's fixation
on the melodies of songbirds, a pivotal event in neuroscientific history: "Nottebohm's obsession with how birds learn to sing set off a chain of discoveries that have fundamentally altered the way scientists think about the brain," Specter explained ...
The brain uses the same neural networks to engage in conscious and unconscious learning
...r block interval. Each block started with a 520-ms fixation
mark (a cross) between the middle two boxes. Subjects were explicitly instructed that red circles denoted a repeating sequence of locations and that black circles denoted a random ordering of locations. Prior to scanning, subjects responded to a sin...
ASPB Annual Meeting, August 3-7, media tip sheet
...elevated carbon dioxide is independent of nitrogen fixation
rate. Carl Bernacchi, University of Illinois - Discusses improved temperature response functions for modeling photosynthetic carbon assimilation. Sean Weise, University of Wisconsin - Speaks on the separate roles for hydrolytic and phosphorolytic pat...
Physics tip sheet #21 July 10, 2002
...e and maybe even turn it into fuel. Artificial CO2 fixation
needs several ingredients: light, a catalyst (such...ade more efficient, a necessary step if artificial fixation
is ever to be practical on a large scale. The authors suggest the possibility that nanocrystal dopin...
A closer look at the genomes black holes
...process among centromeres is that it can result in fixation
of winning centromeres. This process can be deleterious to the host genome, and so centromeric histones would evolve to restore parity between competing centromeres, Henikoff said. Bringing together incompatible centromeres and histones in hybrids wo...
New source of natural fertilizer discovered in oceans
...cean. "It appears that there is much more nitrogen fixation
than we know about," Zehr said. "In the open ocea...e nitrogen getting fixed." The amount of nitrogen fixation
in the open ocean has implications for global warming because nitrogen stimulates the growth of mari...
Scientists discover new source of natural fertilizer in oceans
...cean. "It appears that there is much more nitrogen fixation
than we know about," Zehr said. "In the open ocean...he nitrogen getting fixed." The amount of nitrogen fixation
in the open ocean isn't just a matter for academic curiosity. It has implications for global warming...