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Tag: "twice" at biology news

It's not all genetic: Common epigenetic problem doubles cancer risk in mice

...on-cancer-causing genetic mutation, they developed twice as many tumors as those with normal IGF2 levels, t...ice with extra IGF2 and the APC mutation developed twice the number of tumors as mice with the mutation but whose IGF2 levels were normal. The tumors grew at...

Male circumcision reduces risk of HIV transmission from women to men

...ers has found that uncircumcised men have morethan twice the risk of acquiring HIV than do circumcised men.In the study, published in the Feb. 15 issue of The Journal ofInfectious Diseases, now available online, Jared Baeten and colleaguesfrom the United States and Kenya collected detailed sexual data from...

New Study from Affymetrix Laboratories Points to Changing View of How Genome Works

...osine nucleotides (non-polyA) at the tail-end were twice as common as the more well-studied RNAs that have this sequence. Most transcripts derived from the sparsely transcribed regions between centers of dense transcription are non-polyA transcripts. This study focused on an in depth scan of 10 chromosome...

Taking Aim With Nanoparticle PEBBLEs

...ailored to home in on cancer cells, the rats lived twice as long. With targeted PEBBLEs, some rats were still alive and active two months later, and MRI images showed that their tumors had vanished. Kopelman and coworkers plan to tinker with the PEBBLEs a bit more before trying them on larger numbers of r...

Ice core 'dipstick' indicates West Antarctic ice has thinned less than believed

...e computer reconstructions indicate it was perhaps twice as thick at the end of the last ice age, also called the Last Glacial Maximum. But evidence from an ice core extracted near Siple Dome from 1997-99, along with other calculations, indicates ice in that area has lost only 200 to 400 meters of its thi...

The very unexpected life and death of a leukemic cell

...vy water is made using a form of hydrogen that has twice its normal mass, making the water molecule "heavier" than normal. The special hydrogen serves as a tag that enables researchers to track the utilization of water in the body. The hydrogen incorporates into glucose and the tagged glucose eventually ma...

New RNA polymerase discovered in plants

...culation that this form of polymerase might extend twice as far back in evolution,' Pikaard said. Pikaard said that it is strange that so far this kind of polymerase has been found only in plants. "Why would plants only have these?" he questioned. "It is a bit of a mystery how other organisms that use sm...

Youth With HIV Take More Risks After New Meds Introduced

...istics. The 1999-2000 post-HAART group was almost twice as likely as the pre-HAART group to have had unprotected sex in the last three months. On average, post-HAART youth had nearly double the sexual partners as pre-HAART youth. Post-HAART youth were also more likely to have had a sexual partner who used...

Nanoparticle Breast Cancer Drug Approved by FDA

... all participants treated with Abraxane was almost twice that of participants receiving the solvent-based paclitaxel injection. Without toxic solvents, Abraxane could be given at higher doses than Taxol, which may account, in part, for the increased anti-tumor activity. In addition, albumin is a protein t...

Brain Scans Reveal How Gene May Boost Schizophrenia Risk

...e NIMH researchers scanned 24 healthy young adults twice using PET (positron emission tomography), which uses radioactive tracers to visualize brain function. The first scan measured subjects' overall brain activity while they performed working memory tasks. The second scan used a dopamine tracer to reveal...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...wn as "transmission ratio distortion")-practically twice the Mendelian prediction. Stranger still, male and female mice that inherit the t haplotype from both parents typically do not survive, but in the rare instances when they do, the overwhelming majority of males are sterile. Until now, most genetici...

Signs of aging: Scientists evaluate genes associated with longevity

...ificantly extended lives, persisting approximately twice as long as their wild-type counterparts. Daf-2 was first reported as a critical aging-associated gene in 1993, but since that time, scientists have identified dozens of additional genes that are crucial for longevity. "Aging is a complex process," e...

Man-made wetland's effectiveness similar to natural marsh

... two years, collecting and analyzing water samples twice each month. They tested the samples for concentrations of phosphorus, nitrates and several other chemicals. The researchers also gathered data on water flowing into the wetland from rain and snowfall and from ground sources. They wanted to know if t...

Researchers reveal secrets of flying snakes

...nd study these snakes, Socha traveled to Singapore twice and Thailand once with grants from National Geographic Committee for Research and Exploration. Most flying snakes grow 3 to 4 feet long and live in the trees in the lowland tropical rainforests of South and Southeast Asia. Their temperament varies f...

Studies reveal how plague disables immune system, and how to exploit the process to make a vaccine

...had little effect on TNF secretion. Mice immunized twice over six weeks with rV10 developed antibodies that protected them from many times the lethal dose of the bacteria. "Our data, the authors conclude, "provide the first evidence of plague vaccines that do not suppress innate immune responses ?and that...

Caloric restriction won't dramatically extend life span in humans: UCLA research

...ompared with sumo wrestlers, who consume more than twice the normal male diet, and men in Okinawa, Japan, who consume less than the average Japanese male. ...

Biologists determine genetic blueprint of social amoeba

...s in the organism than they had thought and nearly twice as many as there are in fungi. Their unraveling of the genome also allowed Rolf Olsen, a postdoctoral fellow working in Loomis' laboratory, to generate a tree of life and show that amoebozoa, the group to which Dictyostelium belongs, evolved from the...

University of Nevada, Reno research team discovers hormone that causes malaria mosquito to urinate

...regnant female mosquitoes do this--it will take in twice its body weight in blood. To decrease this added weight, the mosquito urinates on its victim to release fluids. Coast discovered that introducing one of the two diuretic hormones, DH31, into the mosquito causes the mosquito to excrete fluid rich in...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...untries. Importantly, the rate in such drylands is twice as high as that of other, non-dryland regions in developing countries. The authors rank desertification ?land degradation in drylands as a result of climatic factors and human activities ?among the world's greatest environmental challenges, destabil...

Hybrid grass may prove to be valuable fuel source

...re considered mature. Their 10-foot tall stems are twice as high as switchgrass, a prairie grass native to ...nois. Grown side by side, Miscanthus produces over twice as much biomass as switchgrass, Heaton said. To investigate how Miscanthus is so productive, Dohlem...

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