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Tag: "evidence" at biology news

Orientation and the egg

...ay. Drs. Davor Solter and Takashi Hiiragi have new evidence to fuel the ongoing debate. Using various techniqu...apse microscopy, the researchers showed compelling evidence for the absence of predetermined polarity in the mouse egg. Their findings are in contrast to those...

Doctors should stop prescribing antibiotics for the common cold, review advises

...tients with the common cold because there is scant evidence they stop other infections, and the benefits do no...which antibiotics act, yet, says Arroll, "There is evidence of high usage of antibiotics for the common cold in spite of doubts about the efficacy of such thera...

Researchers track down cause of a disfiguring bone disorder

... than in the normal mice. The findings are strong evidence that "the (Van Buchem) noncoding deletion removes a SOST-specific regulatory element," the team reported, indicating that the disease is caused by the absence of one or more distant enhancer elements in the deleted region that help direct the express...

More animals join the learning circle

... studies of feeding behaviour. The findings add to evidence that cultural learning is widespread among animals...scavenging (New Scientist, 11 June, p 12). But the evidence from killer whales is much more conclusive because the process was observed from start to finish. S...

Pinpointing a culprit molecule in Alzheimer's disease

...Ab40) and one 42 units long (Ab42). Circumstantial evidence has suggested that Ab42 is the "stickier" of the t...hey efficiently secrete Ab. To date we have little evidence for the accumulation of intracellular Ab in these mice; thus, they provide an excellent tool to stud...

New Discovery May Help Doctors Treat Infertility

...r beta, was discovered. The current study provides evidence that the beta receptor plays a more significant role in ovarian function than the alpha receptor. Researchers would like to further their investigation into the role of the beta receptor by studying women already undergoing fertility treatment. “The...

Most common lung cancers may begin in newly discovered cells

...stablished tumors, but other scientists have found evidence that some human cancers contain a small but virule...e bronchioles and alveoli, other groups have found evidence of cells that are resistant to damage and are involved in repair and maintenance of tissue. They hav...

Thinking the pain away? Study shows the brain's painkillers may cause 'placebo effect'

... study finds. The study provides the first direct evidence that the brain's own pain-fighting chemicals, called endorphins, play a role in the phenomenon known as the placebo effect -- and that this response corresponds with a reduction in feelings of pain. Previous studies at U-M and elsewhere have shown t...

Micro-molecule plays big role in birth defects

...s ranging from cancer to AIDS. "There is indirect evidence that if you remove two microRNAs from the human genome, leukemia develops," Harfe said. "We envision our mouse model may be a tool to directly test how microRNAs are involved in human cancers." ...

Biased reporting found in cancer prognostic studies

...lieve that this study provides the most compelling evidence yet that the published prognostic literature is a serious distortion of the truth," write Lisa M. McShane, Ph.D., of the National Cancer Institute in Bethesda, and colleagues, in an accompanying editorial. They call for more transparent reporting, be...

Study casts doubt on 'Snowball Earth' theory

...ly unexamined rock formations has turned up strong evidence on the "Slushball Earth" side of a decades-long sc...er, said: "What she has provided is the first real evidence that substantial photosynthesis occurred in the Earth's oceans during the extreme ice age 700 millio...

New lead reported in tumor angiogenesis

...cell contact to prompt angiogenesis. "We have some evidence that inflammatory factors, and even some infectious agents, can induce jagged1 expression," said Wang. "That's what we plan to study next." The article is titled, "Crosstalk between tumor and endothelial cells promotes tumor angiogenesis by MAPK act...

Stem Cells Found In Cerebellum; Possible Cell of Origin for Childhood Brain Tumors

...the cerebellum. The Duke study provides the first evidence that stem cells actually exist in the cerebellum and supports the theory that medulloblastomas could arise from these cells, said the researchers. They hope their discovery will eventually lead to more targeted, less toxic treatments that disrupt the...

Investigating 'brain shrinkage' in alcoholics

...ficits in decision-making. "There is accumulating evidence that the generalized inherited vulnerability to alcoholism and other addictions involves abnormalities of the brain systems that process rewards and punishments," said George Fein, president of and senior scientist at Neurobehavioral Research, Inc., ...

Secrets to antibody's success against West Nile Virus surprise scientists

...es to how it may block infection. Scientists found evidence suggesting that the antibody prevents the virus fr...It's a tempting possibility, but we don't have the evidence to prove it yet," he says. ...

Analysis of flower genes reveals the fate of an ancient gene duplication

...ion event. The work defines a new standard for the evidence required to establish the evolutionary relationships of genes from different species. ...

Virologist finds contagious equine flu in dogs

...or dog-flu outbreak in New York state. There is no evidence that the virus could infect people. According to ...of Florida samples. Still, he added, there is no evidence of the virus jumping to humans, and there is no expectation of it doing so. It is possible the equin...

Penguin chicks exposed to human visitors experience spike in stress hormone

...e American Museum of Natural History. There is no evidence of short-term negative effects, such as different ...more research to be sure," he said. "We are seeing evidence in other species, including humans, that some detrimental physiological changes that happen to adult...

Discovering an ecosystem beneath a collapsed Antarctic ice shelf

...er of bacterial mats. The discovery could provide evidence for researchers to better understand the dynamics within the inhospitable sub-ice setting, which covers more than 1.5 million square kilometers [nearly 580,000 square miles] of seafloor, or an area of the same magnitude as the Amazon basin in Brazil ...

Survival of heart patients on beta-blockers varies greatly with genetic variation

...ns in the beta-adrenergic receptor genes showed no evidence of effect on survival, although small sample size makes this result uncertain. The beta-2 gene commonly has two points of sequence variation within the human population--for most of the population, the gene's coding sequence will be identical from p...

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