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Tag: "times" at biology news

St. Jude study solves mystery of mammalian ears

...r hair cells makes mammalian hearing more than 100 times better than it would be if the cells were absent. As sound waves race into the inner ear at hundreds of miles per hour, their energy—although dissipated by the cochlear fluid—generates waves in the fluid, somewhat like the tiny waves made by a pebbl...

One species, many genomes

...obes. "All together, these probes would have seven times the length of human genome," illustrates Weigel the extent of the project. The data were evaluated with several specially designed statistical methods, including a variant of machine learning. The result of this painstaking analysis: on average, ev...

Nicotine rush hinges on sugar in neurons

... group’s Nature Neuroscience study “one of the few times that you felt that you connected the dots.” The study also represents a tour de force of protein crystallography. Homologs of nAChR had been studied at the atomic scale, but not the receptor itself....

Brain inflammation may be friend, not foe, for Alzheimer's patients

...Alzheimer’s. Work on an Alzheimer’s vaccine has at times been promising, reducing the number of plaques in the brains of animals and a few people with the disease, but it’s also been fraught with difficulty, producing side effects such as encephalitis or severe brain inflammation in people with Alzheimer’s...

Soils offer new hope as carbon sink

...kas Van Zwieten said soils naturally emit about 10 times more greenhouse gas on a global scale than the bur... and nitrous oxide (a greenhouse gas more than 300 times as potent as carbon dioxide). NSW DPI environmental scientist Steve Kimber said an added benefit ...

Researchers find 24 species believed new to science in Suriname rainforest

...orest on the planet, a northern Amazon tract three times larger than the U.S. state of Texas (twice the size of Ethiopia) that is home to 100 indigenous groups. In Suriname, the only former Dutch colony in South America, the forests are at risk from foreign logging and other resource extraction. Cuttin...

Cigarette smoke alters DNA in sperm, genetic damage could pass to offspring

...e of Ms6-hm mutations in the smoking mice were 1.4 times higher than that of non-smoking mice at six weeks, and 1.7 times that of non-smoking mice at 12 weeks. “This suggests that damage is related to the duration of expos...

Brightening prospects of using fluorescent nanotubes in medical applications

...rifuge that subjects them to forces a few thousand times that of gravity. Centrifuging separates out a numb...he improvement was considerably larger – 20 to 100 times – came as a pleasant surprise. “Quantum efficiency is critical, but there are several other factor...

Breakthrough developments in rheumatoid arthritis reported

... of genes that regulate immune function, have a 30 times higher risk of developing rheumatoid arthritis than those without these genetic risk factors. Scientists at the University of Colorado are now analyzing the genes from 2,500 first degree relatives of rheumatoid arthritis patients and testing CCP...

Rising skin cancer rates are more likely to affect wealthy people, says 12-year review

...rom basal cell carcinoma and nearly two and a half times more likely to suffer from malignant melanoma. ... they lived in an affluent area and two and a half times more likely to suffer from malignant melanoma. Affluence didn’t, however, seem to affect squamous...

Undergraduate research shows leaderless honeybee organizing

...ons into her “court” and vibrating her hundreds of times an hour. She responds by changing her behavior -- reducing her food intake, slowing egg laying and becoming more active. At this point, the workers begin to send a second signal that researchers call “worker piping” at a fevered pitch. Piping, which ...

CT scan reveals ancient long-necked gliding reptile

...t back wings. Gliding behavior evolved several times in reptiles and is present in the Indonesian reptile Draco. ...

Exploring the dark matter of the genome

... subsequent sequencing efforts, DNA was made three times from the same strain of flies -- in 1990, 1998, and 1999 -- and that new patterns of transposons were found in each. "We can see intact transposons moving from one position to the next." Says Smith, "The heterochromatin is where transposons may ...

Warning from Asian bees

...ir way into Australian ports at least half a dozen times in the last decade. This time it’s a Javanese strain of the bee and because the latest incursion had lain undiscovered for at least three months, it is unknown how many more swarms might exist and how far afield they may have flown. Within a on...

Runners -- Let thirst be your guide

...e amount of fluid, such as 8 ounces of water eight times a day. But most people don’t really need that much.” Verbalis points out that EAH predominantly afflicts exercisers engaging in endurance activities of 4 hours in duration or longer. But “the average person who goes out for an hour or two of str...

Mutating the entire genome

...in one of every 100 cells. So it is 10,000-100,000 times better. That is important, because multiple molecular steps are needed for a mouse to develop a human cancer – and such mice are used to learn how to treat or prevent cancers, says Capecchi. In many cancers, translocation of two chromosomes is th...

Researchers demonstrate way to control tree height

...the field with USDA approval, and assessed several times for variation in size and appearance. Other than reduced size, there appeared to be striking variation in foliage color and leaf shape, some of which might have significant ornamental value. Root development also appeared to be very strong, which ...

Weizmann Institute scientists develop a general 'control switch' for protein activity

... at specific locations in the body and at specific times – all this by giving exact and well-timed doses of the same simple drug. In addition, the method could be used one day in gene therapy. It may be possible to replace damaged proteins that cause severe diseases with genetically engineered proteins...

Children of smokers have more than 5 times higher levels of a nicotine toxin

...n who have at least one parent who smokes have 5.5 times higher levels of cotinine, a byproduct of nicotine...ate heating. ‘Higher cotinine levels in colder times of year may be a reflection of the other key factors which influence exposure to passive smoking, su...

Prey not hard-wired to fear predators

...longside tigers, wolves and bears-- responded five times faster to the recordings than did elk in Rocky Mountain National Park (Colorado) where major predators have been absent for some 90 years....

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