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Tag: "cycle" at biology news

Ammonia-loving archaea win landslide majority

...nia oxidation is an important step in the nitrogen cycle that was believed for the last 100 years to be solely performed by bacteria," says Christa Schleper, full professor of Molecular biology of Archaea at University Bergen, Norway. The discovery was made possible by a combination of different techni...

Recombination protein dynamics observed with single monomer resolution

...llinois at Urbana-Champaign have observed the life cycle of RecA, a protein that plays a major role in repairing damaged DNA. The protein forms a filament, which grows and shrinks primarily by one monomer at a time, the researchers report in the August issue of the journal Cell. RecA is a DNA recombinati...

Bedsores and bald hides: Novel roles revealed for a 'scaffolding' protein

... and strength, says Coulombe. Hair follicle cells cycle continuously through three phases - growth, death and resting - during normal hair growth. According to the researchers, cells lacking K17 speed from growth to death faster than normal cells, preventing sufficient hair growth. When cells of normal...

No cell walls, no new cancer cells

...ell walls. "In fact, we literally stopped the cell cycle in its tracks by removing SREBP1 from cells. It seems that if you don't have SREBP1 activity, you can't make lipids, and if you don't have lipids, you can't make new cells." According to Dr. Ericsson, who is also a Research Fellow of the Royal Swe...

New study shows antibiotic may protect the heart

... an essential component in the pathway of the cell cycle progression. The drug has been found to be important in transplant medicine and especially in kidney or heart transplantation. Additionally, Kukreja said that because of the antibiotic's antigrowth properties, rapamycin effectively reduces coronary r...

Einstein researchers take the pulse of a gene in living cells

...ocus of the study was a gene important in the life cycle of the social amoeba Dictyostelium, thousands of which sometimes aggregate into a single slug-like mass. This developmental gene plays a major role in transforming the "slug" into a stalk-like structure called a fruiting body, which releases new amoe...

New method confirms importance of fungi in Arctic nitrogen cycle

...chnique is shedding light not only on the nitrogen cycle in arctic tundra ecosystems, but can be applied to other nitrogen-poor ecosystems. "In the future, studies of plant nitrogen supply in all nitrogen-poor ecosystems must include these important transfers between plants and fungi," says Hobbie. ...

Vaccine shown effective against chancroid

... sex workers against chancroid could shut down the cycle of infection, eliminating the disease of not only sex workers but their sexual partners. And evidence suggests that eliminating chancroid throughout Africa could help reduce the transmission of HIV. "Diverting but a fraction of the effort on HIV ...

Beaver dams create healthy downstream ecosystems

...ce in the river valley and affect the area's water cycle and soil conditions, potentially changing plant species and influencing the overall diversity of the ecosystem in the future. They suggest that although there are multiple explanations for the reduction in beaver population, such as alterations in th...

Important gene controlling tree growth and development found

...metimes even older! Trees also have the ability to cycle between growth and dormancy. This is a way to adopt to harsh winter conditions when the supply of water is low and the tree might be damaged from both drought and cold. The trees have adopted to these conditions by stopping growth and forming buds at...

African wetland managers armed with new technology

Earth's wetlands are vital to the water cycle and havens for wildlife, but they are under threat. GlobWetland, an ESA-led initiative in collaboration with the Ramsar Convention Secretariat, has been addressing this issue by using satellite imagery to provide detailed wide-area views of individua...

UWM brain research supports drug development from jellyfish protein

...s at about the 12-year mark in the typical 15-year cycle for a new drug to be developed. Moyer's research centers on brain changes that occur as a result of aging. Specifically, he is interested in the part of the brain called the hippocampus, which is responsible for forming new memories. These capabil...

How nature tinkers with the cellular clock

...d dividing at the right time. That is why the cell cycle is one of the most tightly regulated cellular proc...ral layers adjusts when key components of the cell cycle machinery are produced, activated and degraded to make sure that the schedule is kept. These layers ...

Melatonin improves mood in winter depression

...ical rhythms become misaligned with the sleep/wake cycle during the short days of winter, causing some people to become depressed. Usually these rhythms track to the later dawn in winter, resulting in a circadian phase delay with respect to sleep similar to what happens flying westward. Some people appear ...

Bacterial protein shows promise in treating intestinal parasites

...als. Additional studies also determined which life cycle stages of the parasite were most susceptible to Cry5B and at what concentrations. "These experiments confirmed that the mechanism of action of Cry5B in Ancylostoma hookworms appears to be identical to that for other nematodes, including C. elegans...

Malaria vaccine prompts victims' immune system to eliminate parasite from mosquitoes

...rm. The malarial parasite spends part of its life cycle in humans, and part in mosquitoes. The parasite is injected into an individual by the bite of an infected mosquito. Numerous experimental vaccines have been tried against the form of the parasite that resides in humans, but have been unsuccessful o...

Exposure to dioxins influences male reproductive system, study of Vietnam veterans concludes

...lab tests during six examination cycles. The first cycle was conducted in 1982, so the veterans were followed for more than 20 years. "We found that the risk of developing BPH decreased with increasing exposure to dioxins in the comparison group," said Dr. Arnold Schecter, professor of environmental sci...

The first tree genome is published: Poplar holds promise as renewable bioenergy resource

...ide emitted when biofuels are consumed, creating a cycle that is essentially carbon neutral." Poplar's extraordinarily rapid growth, and its relatively compact genome size of 480 million nucleotide units, 40 times smaller than the genome of pine, are among the many features that led researchers to target ...

Resistance and genetic sensitivity to sleeping sickness

...brucei gambiense (T.b. gambiense). Its development cycle in the host vaires greatly, from a few months to s...re virulent than the chronic form, its development cycle is also more rapid and, consequently, clinical detection can be made earlier. However, it is incr...

Pourquié lab identifies genes involved in formation of vertebral precursors

...tion of the Notch/FGF and Wnt pathways during each cycle suggests that coordinated regulation of these three pathways underlies the clock oscillator. "Our findings shed light on a fundamental aspect of the architecture of the spine by demonstrating the implication of a large network of genes involved i...

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