Tag: "occurs" at biology news

UCSB scientists probe sea floor venting to gain understanding of early life on Earth

...rcent of the hydrothermal cooling of the sea floor occurs in these flanks, and yet these hydrothermal vents ... we suggest that abyssal hill hydrothermal venting occurs in frequent bursts, possibly triggered by earthquakes," said Haymon. "Such widespread and oft-repeat...

UAB scientists discover the origin of a mysterious physical force

...ly understanding the properties of this force that occurs when molecules surrounded by water adhere to each other is also useful in the chemical industry, particularly when involving mechanisms in which colloidal suspensions must be stabilised, such as the mechanisms used to produce paints, cosmetics and fo...

Growth in the sea comes down to a struggle for iron

...diatoms and other phytoplankton, but something odd occurs as these tiny marine plants continue to grow. They begin to starve in the midst of plenty, acting as though iron, an essential nutrient, still is in short supply. Why this happens is unclear, but the answer could be that iron sets off a kind of chemi...

Scientists detect probable genetic cause of some Parkinson's disease cases

...sed with Parkinson's disease eachyear. The disease occurs when certain nerve cells die or becomeimpaired and can no longer produce dopamine, a brain signaling chemical(neurotransmitter). Without it, individuals can develop tremor ortrembling in hands, arms, legs, jaw, and face; rigidity or stiffness ofthe l...

Novel Enzyme Shows Potential As An Anti-HIV Target

...leagues went on to show that transcription via Tat occurs in the presence of SIRT1, but not when SIRT1’s catalytic center is removed. Experiments using cells taken from transgenic mice lacking SIRT1 demonstrated that introducing human SIRT1 enzymes increased Tat’s transcriptional effects in a dose-dependent...

Mouse brain tumors mimic those in human genetic disorder

...ood vessels andinfiltration of immune system cells occurs before actual tumorformation suggests that these events are important for the developmentof tumors," Gutmann says. "These findings raise the possibility thattargeted therapies for NF1 brain tumors may involve agents that preventthe supply of growth p...

Scientists discover the cellular roots of graying hair

...signaling the stem cells that is absent when aging occurs and thestem cells die off? Now we have a much more refined way of dissectingthat signaling pathway in melanoma. Eventually we hope to tap into thisdeath pathway, thereby using drugs to mimic the aging process, tosuccessfully treat melanoma.?The team ...

Researchers identify target for cancer drugs

...a process called "phosphorylation"). This process occurs not only in human cells but in other organisms such as the fruit fly. Finding this complex conserved in species as diverse as flies and humans supports the claim that the mTOR/rictor complex is indeed a missing piece of the puzzle. According to Sarb...

Fundamental Finding Yields Insight into Stem Cells, Cancer; Opens Door to Drug Discovery

...signaling the stem cells that is absent when aging occurs and thestem cells die off? Now we have a much more refined way of dissectingthat signaling pathway in melanoma. Eventually we hope to tap into thisdeath pathway, thereby using drugs to mimic the aging process, tosuccessfully treat melanoma.?The team ...

Weizmann Institute scientists develop a new approach for directing treatment to metastasized prostate cancer in the bones.

...signaling the stem cells that is absent when aging occurs and thestem cells die off? Now we have a much more refined way of dissectingthat signaling pathway in melanoma. Eventually we hope to tap into thisdeath pathway, thereby using drugs to mimic the aging process, tosuccessfully treat melanoma.?The team ...

Experiments provide proof of how traveling in groups protects insects

...r benefit to band members," Lorch said. "Predation occurs anyway, but any given individual is far better protected than it would be if it were on its own." The research, supported by the USDA, is part of a larger study designed to learn whether scientists can predict and possibly change the path of massive...

Experiments provide proof of how traveling in groups protects insects

...r benefit to band members," Lorch said. "Predation occurs anyway, but any given individual is far better protected than it would be if it were on its own." The research, supported by the USDA, is part of a larger study designed to learn whether scientists can predict and possibly change the path of massive...

UCSD researchers maintain stem cells without contaminated animal feeder layers

...s continuing studies to determine if contamination occurs from this source. For a proposed animal-free medium, the UCSD study takes advantage of a previously unidentified soluble factor this is secreted from mouse feeder layers to maintain stem cells' undifferentiated state and pluripotency, the ability to...

Researchers discover molecule that causes secondary stroke

...d vessels in the brain, cerebral vasospasm usually occurs three to 10 days following a massive brain bleed known as hemorrhagic stroke. Sixty percent of patients who survive the initial stroke develop vasospasm, and 40 percent of them die from it. Vasospasm, says neurology department researcher Joseph Clar...

Scientists identify genetic pathways essential to RNA interference

... RNA segments, shutting down gene expression. RNAi occurs naturally in plants and animals and may help control resistance to viral infection, among other functions. For the current study, lead author John Kim, PhD, and his colleagues developed a strain of C. elegans into which they added a gene that caused...

Researchers trace evolution to relatively simple genetic changes

... data to long-standing debates about how evolution occurs in natural habitats. "Our motivation is to try to...dramatic change in skeletal pattern, a change that occurs naturally in the wild," he noted. "And it turns out that the mechanisms are surprisingly simple. In...

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

... data to long-standing debates about how evolution occurs in natural habitats. "Our motivation is to try to...dramatic change in skeletal pattern, a change that occurs naturally in the wild," he noted. "And it turns out that the mechanisms are surprisingly simple. In...

DNA Recombination and Repair—A New Twist to RecA Function

...ey are at the fiber’s 5' end, while ATP hydrolysis occurs all along its length. Under their experimental conditions, the authors found that a RecA molecule hydrolyzed 20 ATPs per minute—or one ATP every three seconds. If ATP hydrolysis occurred randomly in the fiber, one would expect a RecA molecule to dis...

Tiny scaffolding allows stem cells to become working fat cells

...nes, and subsequent proteins and did so as well as occurs in normal tissue. So far, the researchers have kept the cells alive and thriving for several months and hope to maintain them for up to a year. "We know that the environment in which a community of cells finds itself has a great deal of influence on...

TEL2 gene cooperates with MYC gene to provoke B-cell lymphomas

...cing the command to commit suicide. This situation occurs when increased TEL2 activity reduces the cell's ab... this sequence of events modeled in the mouse also occurs in human lymphoma patients. Combined elevated TEL2 and MYC expression occurred in the B lymphocytes ...

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