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Tag: "kept" at biology news

Salk scientists get to the root of plant cell fate

...plants with a mutant TOPLESS, genes that should be kept off in order to produce a shoot aren't, so a root is produced," he explains. Since transcriptional repression plays such a key role in animal embryonic development, the finding that a co-repressor controls polarity in plants was surprising, says Lon...

Parallel evolution: Proteins do it, too

...rade double-stranded RNA, but the older genes have kept it. "So it looks like, after gene duplication, there is a division of labor," Zhang said. "Before duplication, the gene is supposed to do both jobs: digestion and degrading double-stranded RNA. After duplication, one copy seems to retain the activit...

Leptin found to control appetite and limb development in frogs

... their feed as the older frogs did, these tadpoles kept right on eating and quickly sprouted limbs. Denver, who has studied the ability of frogs to speed up their metamorphosis in response to a drying pond, thinks that the tadpoles' feeding mechanism is stuck in the "on" position at the first stages of ...

Snakes' virtual glasses, leopard spots and all-optical transistors

.... Because snakes' brains are small, the physicists kept their model of an image enhancing network simple. They discovered that even a crude network dramatically improves infrared imaging - which you might want to keep in mind if you ever book a flight on a snake-infested airline. A Model of Changing L...

Plants tell caterpillars when it's safe to forage

...ilter paper attached to the plastic cups they were kept in. When larvae were fed an artificial diet, however, different light conditions produced no changes in their hiding behavior. But introducing plants changed larvae behavior under both day and night conditions. Six pots of three uninfested corn pla...

Failure of 'scout cells' may lead to cancer in transplant patients

...ore than 90 percent of Americans but is ordinarily kept under control by the immune system. That control can be lost in people whose immune system is suppressed to prevent rejection of a transplanted organ. The cancer, called post-transplant lymphoproliferative disorder (PTLD), arises only in some tran...

Heart has enough oxygen to survive hypothermia, CPR crucial

...to 15°C, but for five hours. The control group was kept at normal temperature, 37°C (98.6°F). The researchers followed the hemodynamic changes during hypothermia and rewarming and later examined the rats' heart cells. When core body temperature was lowered to 15°C, both hypothermic groups experienced a ...

Septum keeps neurons in synch, can reduce epileptic seizures by 90 percent

...ctrical impulses but it's a chatter that has to be kept in check, or it can snowball into an electrical storm that marks an epileptic seizure, Colom explained. Epilepsy affects an estimated 4 million Americans, he said. There are a variety of ways to induce neurons to fire rhythmically, including, inter...

How ancient whales lost their legs, got sleek and conquered the oceans

...e transition, their limbs became smaller, but they kept the same number and arrangement of hind limb bones as their terrestrial ancestors." In findings to be published this week in the Proceedings of the National Academy of Sciences, scientists say the gradual shrinkage of the whales' hind limbs over 15 ...

Radiation-killed bacteria vaccine induces broad immune response in mice

... gamma-irradiated bacteria also may not need to be kept cold; an advantage in settings where refrigerating... of live, attenuated vaccines is that they must be kept refrigerated at all times: if the "cold chain" is broken, the vaccine is liable to spoil and become ...

Iraq's marshes show progress toward recovery

...pected because of record snowpack melts, which has kept salinity levels low. The incoming water quality has been better than predicted, too, with toxin levels lower than had been feared. As a result, many native species have returned, including some rare bird species, although their numbers have not rebou...

Genetically altered mice no longer like cocaine

... were confined to the other compartment. Mice were kept in these respective compartments for 30 minutes. On the last day of the experiment, mice were again free to roam the box, and no injections were given. The animals were videotaped while they were in the box. "The normal mice spent more time in the c...

New crop of technology reveals plant health

...l growing conditions for a crop, so that crops are kept in the best possible health with the minimum of inputs," says Dr Fiona Tooke of the Eden Project, one of the project partners. "It promotes sustainability, because there isn't excessive use of inputs like fertilizer and water. It makes crop managemen...

Uncovering sex-change secrets of black sea bass

... the fish were more likely to turn into males when kept in crowded tanks. Berlinsky is continuing his experiments to clarify the role that water temperature plays and to further understand what factors determine the initial sex of captive-born fish. He's also collaborating with Canadian researchers to st...

Berkeley researchers lay groundwork for cell version of DNA chip

...r 35 minutes, rinse, and we're ready to go. We've kept our cells alive on the chip for up to 25 hours and the same proportion of cells survive using our method as cells cultured under identical conditions." The next step, Chandra said, is to develop procedures for making complex arrays of cells quickly....

Invasive exotic plants helped by natural enemies

...hrive because they escape the natural enemies that kept them in check in their native ranges, a new study in the journal Science suggests the opposite. Exotic plants that are in the presence of their natural enemies actually do better in their introduced ranges. The research from the Georgia Institute of ...

Avian flu transmission to humans may be higher than thought

...to being an important source of income, poultry is kept by many rural households for subsistence farming. The current epidemic in poultry is thus not only a public health problem but also an economic drawback for the many Vietnamese who live in rural areas." The researchers note the Vietnam is the count...

New antimicrobial compound adheres to skin to promote healing

...e found that using an ointment made from vitamin E kept wounds from dehydrating and promoted healing. He learned that Capomacchia was also working with vitamin E in transdermal applications, and their collaboration began. Ritchie said that the bioadhesive could have numerous human applications, particul...

Losing sleep undoes the rejuvenating effects new learning has on the brain

...ining session, half the animals in each group were kept awake for six hours by being presented novel stimuli that kept them interested and awake. The other half were returned to their cages and allowed to sleep. After s...

UF researchers develop ways to keep the bloom on the rose

...ased by the consumer." In the past, fresh flowers kept their quality longer because they were sold in local markets in the vicinity of the fields where they were grown, said Kremp, who has been in the floral industry more than 50 years. When the floral industry began shipping flowers by air to retailers,...

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