Tag: "spontaneous" at biology news
UCSD biologists discover chemical important in guiding visual system development
...dication. Scientists have long recognized that spontaneous
neural activity is needed for the normal developme...lp us understand the mechanism that generates this spontaneous
activity might make it possible to recreate it later in life; for example, to coax regenerated nerve...
Darwin's greatest challenge tackled: the mystery of eye evolution
...urd" to propose that the human eye evolved through spontaneous
mutation and natural selection. Scientists at the European Molecular Biology Laboratory (EMBL) have now tackled Darwin's major challenge in an evolutionary study published this week in the journal Science. They have elucidated the evolutionary origin...
U-M researcher examines the cell's housekeeping habits
...ed autophagy also appears to have a higher rate of spontaneous
tumors, Klionsky said. Autophagy helps the cell fight infection by some kinds of invading bacteria and viruses, by cleaning them out of the cell's interior without having to discard the entire cell. As a result, some pathogens try to escape autophag...
Mayo researchers define celecoxib pathways and mechanisms for tumor reduction
...ployed a mouse model system that closely resembles spontaneous
breast cancer progression and metastasis in humans. "The MTag mouse model for human metastatic breast cancer is a helpful and important model in which to evaluate therapeutic strategies and to understand the mechanisms associated with therapy-...
Scientists achieve self-assembly of spider silk fiber in insect cells
...ugh techniques of genetic engineering, in creating spontaneous
production of spider web fiber in insect cell cultures. These fibers were equal in their chemical resistance characteristics to those produced by the spider. Mass production of such fiber in the future can be used industrially in various areas which ...
Doctors link common chemotherapy drug to jawbone necrosis
...ling of injectable bisphosphonates, describing the spontaneous
reports of the condition being found mostly in cancer patients. The alerts also recommend a dental examination with appropriate preventive dentistry in patients with risk factors such as cancer, chemotherapy, corticosteroids and poor oral hygiene pri...
Baby songbirds and human infants learn sounds in similar ways
...naries in the 1980s provided the first evidence of spontaneous
neuronal replacement in the adult vertebrate brain. A problem-solving approach may apply to other kinds of sensory motor learning beyond vocal learning, he added, suggesting that zebra finches may offer further insights into human learning. "I find ...
Researchers find how protein allows insects to detect and respond to pheromones
... LUSH, however, they found a 400-fold reduction in spontaneous
activity, indicating that LUSH is necessary for th...e neuron to function properly. "This reduction in spontaneous
activity was a surprising finding," Dr. Smith said. "Our results indicate that LUSH, and not the phe...
Research using mouse models reveals a novel key player in the initiation of colon cancer
...olyposis, or environmental stress that generates a spontaneous
mutation in the APC gene, mutations in the Foxl1 gene or its targets may dramatically increase the likelihood that the second normal copy of the APC gene is lost or mutated, leading to the initiation of tumor formation. This study sets a new parad...
New research questions basic tenet of neuron function
...actively relaying a message, and the other through spontaneous
release when the neuron is "at rest," or inactive.... neurotransmitter release one type of vesicle for spontaneous
release, another vesicle associated with activity-dependent release. "These findings question one ...
Heart repair gets new muscle
...s well as the fact that Spoc-derived cells display spontaneous
rhythmic beating and express cardiac markers, whether they are grown in a test tube or have migrated to injured hearts in study mice. The authors can't say why skeletal muscle would harbor cardiac stem cells, but for now, the Spoc cells provide a va...
Thumbnail sampler of 10 diverse physiology papers from IUPS 2005
...und that testosterone replacement had no effect on spontaneous
activity, whereas estrogen did. Identifying gender...will attempt to determine if the estrogen improved spontaneous
activity through behavior, a local muscle-specific response or a combination. Funding: NASA and Nati...
Schizophrenic antifungal bacteria
... discovered that these switches were caused by the spontaneous
mutation of certain genes. As these mutations are reversible, the bacteria can switch back and forth between the two phases. Spontaneous mutants no longer produced drugs against the fungi, but they grew faster than their fungal-controlling alter egos...
Spontaneous ignition discovery has ORNL researcher fired up
...aboratory's Hu describes a novel method to achieve spontaneous
ignition and sustained combustion at room temperat.... The method outlined in the paper "Nano-catalytic spontaneous
ignition and self-supporting room-temperature combustion," co-written by ORNL's Vassil Boiadjiev and...
Combating antibiotic resistance
...led by Floyd Romesberg has uncovered evidence that spontaneous
mutations are not the only way in which bacteria acquire resistance to antibiotics; the bacteria, rather than passively waiting around for a lucky break, may play an active role in their own evolution. DNA damage, induced by certain antibiotics (pro...
To stop evolution: New way of fighting antibiotic resistance demonstrated by Scripps scientists
...er the lifetime of an organism, a certain level of spontaneous
mutations will occur -- mistakes that escape repair and become part of the DNA of the cell in which they occur. Scientists have generally thought that slowly over time, these mutations accumulate and species diverge. However, Romesb...
One gene links newborn neurons with those that die in diseases such as Alzheimer's
...e brains, areas where neurons are known to undergo spontaneous
replacement. They found markedly low levels of UCHL1 in the replaceable neurons of both these regions. "Low levels of UCHL1 appear to be a feature of replaceable neurons wherever they occur," says Lombardino. The scientists also knew that, in songbi...
First frozen egg baby born in Canada
... age, a woman's fertility declines and the rate of spontaneous
abortion increases significantly. The risks of chromosomal abnormalities, such as Down's syndrome, are also higher in babies produced by older women. Finally, current egg donor programs require matching the menstrual cycle of egg recipients; this pro...
JCI table of contents July 1, 2005
... can mature and cause disease. These studies of a spontaneous
T-cell avidity maturation response advance our understanding of the progression of autoimmune diabetes. Title: Developmental control of CD8+ T-cell avidity maturation in autoimmune diabetes AUTHOR CONTACT: Pere Santamaria University of Calgary, Cal...
Suppressing growth hormone in early adulthood may prevent cancer
...hat increases IGF-1 levels) exhibit an increase in spontaneous
mammary tumors. Dwarf animals with 50 percent lower IGF-1 levels do not develop tumors in response to a chemical carcinogen. But Sonntag said that if these dwarf rats are given growth hormone to increase IGF-1 in the blood, tumors develop at the same...
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