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Tag: "again" at biology news

Too mellow for our predatory world

... studies from December 2003 until January 2004 and again in March 2005, using the research platform of the Max Planck Society. The islands in the Pacific Ocean continue to be a magnet for evolutionary biologists. Nowhere else is it possible to observe such a variety of different adaptation strategies in su...

Temperament linked to onset of cancer and early death in female rats

... reached adulthood, and then became differentiated again during middle age with the fearful rats having irregular cycles more often. The aging affects on reproduction were also accelerated in the fearful rats. In an earlier study, University of Chicago researchers looked at the lifespan of male rats and ...

Oldest animal fossils may have been bacteria

...idence of reductive cell division. Then he thought again about the phosphorite deposits. "When I put those two pieces together, I said ?perhaps they're not animal embryos at all." Bailey and his co-authors compared the size and geometrical properties of the Doshuanto fossils and modern Thiomargarita ba...

New biochip helps study living cells, may speed drug development

...ing from two times Earth's gravity to zero gravity again and again," he said. "There is absolutely no way this experiment could have been done without this chip." The current technology for analyzing cells' electrical activity, called "patch clamping," uses a tiny electrical probe viewed under a microsc...

Restoring tamoxifen sensitivity in resistant breast cancer cells

...n receptor to a form that makes it vulnerable once again to tamoxifen," said Li Hua Wang, Ph.D., lead author of the study. Some, but not all, breast cancer cells have specific receptors that bind estrogen molecules circulating in the bloodstream. When estrogen binds to the estrogen receptor, it triggers ...

Steep oxygen decline halted first land colonization by Earth's sea creatures

...then shot up again, and vertebrates and arthropods again began moving from the sea to land. "It matches two waves of colonization of the land," Ward said. "In the first wave the animals' lungs couldn't have been very good and when the oxygen level dropped it had to be hard for the vertebrates coming out...

Scientists find a key to immune system's ability to remember

...ous response when that same pathogen comes calling again years later. Unlike naïve T cells, which are confined to the lymphatic system, memory T cells are found everywhere in the body, enabling them to sense and react more quickly when an infectious agent is reencountered. "Now we know one of the reason...

Halving daily cigarette quota has no health benefit

...for cardiovascular risk factors, and then screened again twice at an interval of three to 10 years, adding up to an average monitoring period of over two decades. Participants were classified as never smokers; ex smokers, quitters (those who gave up between the first and second check); moderate smokers ...

Smoking changes brain chemistry

...ing cessation program two weeks after quitting and again six months later. Patients were encouraged to use nicotine patches during the initial six weeks of smoking cessation; however, only 36 of the patients complied. Proton MRS is able to measure brain metabolism at the cellular level and can provide ...

Jefferson scientists identify gene mutation potentially involved in breast cancer initiation

...rowth-stimulating factors, estrogen receptors were again increased, leading them to conclude that two factors may be required for estrogen receptor upregulation: Caveolin gene inactivation and growth factor depletion. The findings may have clinical implications. According to Dr. Lisanti, those breast canc...

Parasitic plants sniff out hosts

...mple as a control in the opposite direction. They again observed a strong growth response toward the tomato volatiles. "This showed that host volatiles elicit a growth response in the absence of any other plant-derived clues," says Mescher. "However, while volatile chemicals might be key, our results d...

Americans support free access to research

...ty advisor to NIH's AIDS vaccine trials. "Time and again the lesson is that improved knowledge in the community furthers the public health agenda." In another strong signal of broad support for public access, Sen. John Cornyn (R-TX) and Sen. Joseph Lieberman (D-CT) recently introduced the Federal Research...

Researchers find protein that silences genes

...silenced and how silenced alleles can be turned on again may someday have practical benefits. For instance, tumor suppressor genes that normally help keep cells from dividing uncontrollably are often silenced by DNA methylation and histone modifications in cancer cells, contributing to tumor growth. And c...

MUHC announces a transplant first in Quebec

...cated." The patient has now fully recovered and is again living a full and rich life. "I am extremely impressed with the doctors at the MUHC; from the onset I had unquestioned confidence in their ability to perform this complex surgery," says Patrice Dionne. "I'm so thankful that I will now be able to enjo...

Dopamine drug leads to new neurons and recovery of function in rat model of Parkinson's

... with their paws. A subset of the rats was tested again 2 and 4 months following the treatment. Rats treated with 7-OH-DPAT had more than twice as many proliferating cells in the substantia nigra as rats that were treated with saline, the researchers found. Many of the newly generated cells appeared to...

Einstein researchers take the pulse of a gene in living cells

... on, then disappears (gene "off") and then appears again (gene "on"). The focus 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"...

Proteins as parents

...ension of our muscles and also pulls them together again after an extension. Depending on the type of muscle, there are differences: The titin found in heart muscle is less tensile than that found in skeletal muscle and it gives the heart the necessary stability to resist the pressure of the inflowing bloo...

Links between DNA damage and breast cancer studied

...ntrations of two similar mutagenic DNA lesions and again demonstrated that their occurrence is roughly commensurate with the age at which the incidence of female breast cancer rises. "Collectively," they observe, "the findings reveal that the structural changes in DNA described may potentially disrupt norm...

Hope I die before I get old?

... their level of happiness at age 30 and at age 70, again on a scale of 1 to 10. They were also asked to guess the happiness of the average person at each of those ages. To make sure that their online survey methodology didn't skew the results by including an atypical group of older people, the researcher...

Infected for life

...hy cold sores, caused by a herpes virus, come back again and again. The new study, published online last month in Nature, points to a small RNA molecule, called a microRNA (miRNA) as the culprit that keeps the latent virus-infected cell alive. These findings could one day lead to a new way to fight the vir...

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