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Tag: "exist" at biology news

Scientists map one of biology's critical light-sensing structures

...nds of phytochromes found in every plant, and they exist in virtually all cells. They occur in greater concentrations in cells that respond directly to light, such as in root tips and new shoots. The phytochrome revealed by the Wisconsin team was derived from a microbe known as Deinococcus radiodurans, a ...

SLU researchers uncover direct evidence on how HIV invades healthy cells

...rugs such as AZT and drug combinations (cocktails) exist to inhibit reverse transcriptase and protease. As of yet, there are no drugs to counter integrase. By using a biophysical methodology known as Fluorescence Resonance Energy Transfer, Bera and his colleagues showed that the integrase holds the two en...

Researchers quantify more noise in gene expression

... cells and other species. "Individual yeast cells exist at various stages of their growth cycle, and this extrinsic variability explains a large component of the noise that must be accounted for in creating a mathematical model of the cell," said Dmitri Volfson, project scientist and a co-author of the st...

Deep treasure to be found in Oculina Bank

...eet high. Deepwater Oculina reefs are not known to exist anywhere else on the planet besides off Florida. Fishing for shrimp and scallops has damaged a large portion of the concentrated coral areas of these reefs over the past three decades. However, the remaining healthy reefs still support dense and d...

Scientists observe how a close bond activates the immune system

... foreign proteins called antigens. These receptors exist in astonishing, and for all practical purposes, unlimited variety--allowing the body to recognize any pathogen it might encounter. Just as police need evidence of a crime to begin an investigation, T cells must recognize a specific antigen before...

Ancient anthropoid origins discovered in Africa

...tic fields. According to Simons, other anthropoids exist at BQ-2 and will soon be described, The latest fossils of the new species consist of tiny teeth and jaws, whose shapes yield critical clues about the species whose mouths they once occupied. For example, a tooth root from the species Biretia megalop...

Logging doubles threat to the Amazon, rivaling clear-cutting, study suggests

...uitous but very diffuse types of disturbances that exist in Brazil or in any tropical forest," Asner said. The researchers found that, from 1999 to 2002, selective logging added 60 to 128 percent more damaged forest area than was reported for deforestation alone in the same study period. The total volum...

Tropical dry forests receive international recognition

...s protected. The most diverse tropical dry forests exist in southern Mexico and the Bolivian lowlands and the level of endemism--species unique to that area--is higher than in rainforests. Half of Costa Rica's dry forests have already been cut down and others face a similar threat, taking with it such reso...

Many smokers fail to quit after cancer diagnosis

...herapy and pharmacotherapy, but only a few studies exist assessing their efficacy. Another shortfall is that these studies, with one exception, target smokers with smoking-related cancers. The common finding was that the healthcare provider has a significant impact on smoking cessation rates. Interventions...

Research casts doubt on circulating stem cells

...rve cells but blend with the neurones that already exist there." In this case, the presumed stem cells would only have coloured a few brain cells green. ...

Picky female frogs drive evolution of new species in less than 8,000 years

...contact zone," Hoskin said. "This problem does not exist at the other contact because the southern lineage population is very small and occurs primarily within the contact zone." Because the frogs in the isolated contact area had a distinctively different call, and because they were effectively isolated f...

UF scientist finds unexpected link between cat and human AIDS viruses

...act to each other, and any implications that might exist for vaccine efficacy, Yamamoto began experimenting with long-term, nonprogressive strains of FIV that led to the current commercial vaccine. Now she is working on an HIV vaccine consisting of HIV virus from long-term, nonprogressing individuals. "We...

Human brain is still evolving

...n also said that a multitude of other genes likely exist that influence brain size and development, and further research could reveal far more complex effects of natural selection on such genes. Lahn speculated that the new findings suggest that the human brain will continue to evolve under the pressure o...

Study findings offer potential new targets for antibiotics

... antibiotics. "Now that we know these other sites exist and that they could be potential targets for antibiotics, the next step is to figure out how exactly these mutations interfere with the cell's own ribosomes," Fredrick said. ...

Nanotechnology to provide portable genetic risk detection

...M) in Spain. "Though commercial biosensing systems exist they are larger and designed to be used in laboratories. We are the first to develop a fully integrated system on a small scale in this field." The final device will be roughly the size of a human hand, allowing it to be used in doctors' surgeries t...

Rutgers to lead $52.7 million protein research program

...the 100,000 protein families that are estimated to exist in nature. These structures, in turn, have provided templates for predicting models of over 40,000 protein structures using methods of structural bioinformatics. Other NIGMS pilot program centers brought the total to about 1,500 structures which can...

Birds and bats sow tropical seeds

...cape, the remnants and forest fragments that still exist in it is dispersal-limited. That is, the seeds don't get there." Howe said most tropical areas re-vegetate naturally after being abandoned, or by replanting a limited number of fast-growing trees that rely on the wind for seed dispersal. Replanting ...

MSKCC researchers uncover structure of key protein complex in cells

...tructure of these molecules as they are thought to exist in the cell. "Understanding this process could be important in many physiological steps that are disrupted in cancer -- including error-prone DNA replication, chromosome segregation, the cell's response to stress, and normal signaling reactions," sa...

Molecular mechanism of feather formation found

...e team then tested whether such interactions truly exist in the developing feather. In the first steps of feather development, cells exposed to essentially the same levels of Bmp2 and Shh grow from a small bud to form a uniform ring. Shh then is expressed in specific spots along the ring, giving rise to bu...

Evolution of life on Earth may hold key to finding life in outer space

... conditions under which these microbes are able to exist on Earth, the likelihood of finding life in outer space also increases. In "Fantasy Worlds," for each type of extremophile found, animators created a parallel imaginary alien planet on which these microbes are likely to thrive rather than just surviv...

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