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Tag: "low" at biology news

Researchers discover way to make cells in the eye sensitive to light

...n. When the mice lackingmelanopsin were exposed to low light, their pupillary response was thesame as normal mice, but when they were exposed to bright light theirpupil constriction was incomplete.The researchers believe that while not a cure for blindness, thefindings could lead to therapies for treatin...

Growth in the sea comes down to a struggle for iron

...re than a century, oceanographers puzzled over the low abundance of phytoplankton in some ocean waters that seemed to hold all the basic nutrients for life. Speculation that iron provided part of the answer goes back to the 1930s. However, it wasn't until 1989 in the journal Nature that oceanographer Joh...

Poor prenatal nutrition permanently damages function of insulin-producing cells in the pancreas

...Center have discovered one reason why infants with low birth weight have a high potential of developing t... can result in intrauterine growth restriction and low birth weight. The Joslin study, published in the March edition of Diabetes, reinforces what scienti...

HIV Patients May Be at Risk of Heart Problems When Taking Protease Inhibitor Drugs

... experience these unexpected side effects are very low -- much less than 1 percent." Co-investigator Michael Ackerman, M.D., Ph.D. agrees that the benefits of the drugs far outweigh the risks. "Our findings should not jeopardize the availability of protease inhibitors because these drugs are too importa...

Iron Deficiency Sparks Dramatic Changes In Gene Expression

...mately thetreatment of serious disorders caused by low iron levels.Results of his study, funded by the National Institutes of Health, arepublished in the Jan. 14, 2005, issue of the journal Cell. Iron deficiency is the most prevalent and severe nutritional disorderworld wide, affecting more than 2 billi...

The secret lives of whales

...rs but hadn’t focused on the significance of their low voices. To me it was like —ohmygawd!?/p> Access to the U.S. Navy’s underwater listening systems took researchers from fixed-point observations such as ships, to synoptic views of the ocean. Clark can move a cursor around a screen and listen-in on...

Enzyme shown to help protect genomic stability

...is associated with gene activation and to maintain low levels of the ubiquitin molecule at those sites. Interestingly, Ubp10 appears to work similarly and in concert with another enzyme called Sir2, which removes acetyl molecules from histones. Sir2 has also been associated with promoting genomic stabil...

Plant hemoglobins: Oxygen handlers critical for nitrogen fixation

...in free-oxygen concentrations in nodules at levels low enough to avoid damage of oxygen-sensitive nitrogenase, the bacterial enzyme complex responsible for symbiotic nitrogen fixation. Thus, plant hemoglobins fulfill roles analogous to those of animal hemoglobins, as well as novel roles that are apparent...

Highly adaptable genome in gut bacterium key to intestinal health

... were fed a diet high in complex carbohydrates and low in simple sugars. Ten days later, the activity of all genes in the bacterial genome was surveyed in B. theta from the mice's guts. The research team found that 1,237 of the bacterium's 4,779 genes were highly active compared to B. theta grown in a s...

Gene Therapy For Parkinson's Disease Moves Forward In Animals

...e use, so that's good. We now know we can use very low doses that are still effective, so that's good. But we need a safety net. Once we turn it on, it's on for life. So we have to control it, and we're working on this as we speak. But it's not ready for clinical trials.?/p> About a half million Amer...

Researchers trace evolution to relatively simple genetic changes

...also shows that the same gene is used whenever the low armor trait evolves. "We used sequencing studies t...cean fish with complete armor, and we found a very low level of this genetic variant in the marine population." So, he said, "the marine fish actually car...

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...also shows that the same gene is used whenever the low armor trait evolves. "We used sequencing studies t...cean fish with complete armor, and we found a very low level of this genetic variant in the marine population." So, he said, "the marine fish actually car...

Researchers add new tool to tumor-treatment arsenal

...maging agents can be toxic, and doses that are too low allow for DNA repair and further cell growth. Thus, says Dr. Thomas, there is need for drugs that can sensitize cells to lower doses of DNA-damaging agents to guarantee cell death, but without the toxic side effects. The researchers studied the resu...

Ice core 'dipstick' indicates West Antarctic ice has thinned less than believed

... for more than 600 miles. An ice sheet with such a low profile and gradual decline would have had to have a very slippery bed to maintain its continuous flow, Waddington said, and it appears the ice flowed vigorously despite being relatively thin. One major implication of the research, he said, is that ...

Family trees of ancient bacteria reveal evolutionary moves

...us and inexplicable rise in oxygen, from extremely low levels to 10 percent of what it is today. There were three ?some say four ?global glaciations, and the fossil record reflects a major shift in the number of organisms metabolizing sulfur and a major shift in carbon cycling. "The question is: Why?" s...

Gene therapy for Parkinson's disease moves forward in animals

...e use, so that's good. We now know we can use very low doses that are still effective, so that's good. But we need a safety net. Once we turn it on, it's on for life. So we have to control it, and we're working on this as we speak. But it's not ready for clinical trials." About a half million Americans ...

Applied Biosystems Introduces Advanced Gene Expression Service Provider Program

...ample for the detection of genes expressed at very low levels compared with conventional fluorescent microarrays. The system uses a chemiluminescence-detection instrument, software, and chemistries to deliver unambiguous gene results that are highly sensitive and reproducible. The PCR process and the 5'...

Harnessing microbes, one by one, to build a better nanoworld

...ample for the detection of genes expressed at very low levels compared with conventional fluorescent microarrays. The system uses a chemiluminescence-detection instrument, software, and chemistries to deliver unambiguous gene results that are highly sensitive and reproducible. The PCR process and the 5'...

Vascular structure and function improve with diet and exercise

...eds with olive oil as an important fat source, and low to moderate amounts of dairy, fish and poultry. "There have been studies looking at diet and exercise to prevent or treat cardiovascular disease," said primary investigator Robert J. Petrella, M.D., Ph.D., associate professor in the Schulich School ...

Rats infected as newborns grew up vulnerable to memory problems during an immune challenge

..., a second group of these rats was injected with a low dose of lipopolysaccharide (LPS), a bacterial component that causes flu-like symptoms,. This time, the rats infected with E. coli as newborns froze 70 percent less often than the rats who'd been injected with salt water as newborns. In other words, u...

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