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Tag: "hypothesis" at biology news

Most widely used organic pesticide requires help to kill

...ing hypothesis, lead to starvation. An alternative hypothesis holds that the spread of the bacterium in infected...w of Bt's mode of killing. "What was proposed as a hypothesis in one paper became cited as proven in another and no one seemed to go back to the original literatu...

Paying attention sets off symphony of cell synchronization

...on has been a long-time concern of scientists. One hypothesis is that when you pay attention neurons produce stronger brain activity, as if the stimulus itself was stronger. That would mean that paying attention might make something appear more intense, and possibly distort its actual appearance. In the North...

Restoring tamoxifen sensitivity in resistant breast cancer cells

..., or DIBA. The investigators confirmed their study hypothesis about DIBA's effect on tamoxifen resistance by using the compound in mice that were engineered to have tamoxifen-resistant tumors and saw that tumor growth was reduced by nearly 50 percent when DIBA was administered. "Exposure to DIBA causes certai...

Search on for treatment of slow-healing wounds

...rd-to-kill infections on medical implants. "Our hypothesis is that once a biofilm starts in a wound it interferes with the normal healing process and becomes very tough to eradicate," said Phil Stewart, Center for Biofilm Engineering director. "However, there is much science still to be done. Biofilms' invol...

Study offers innovative profile of enzyme that aids tumor growth

...d to their naturally occurring activities. "Our hypothesis was that the determination of catalytic activities for enzymes like KIAA1363 could be done directly in living systems through the integrated application of profiling technologies that survey both the enzymatic proteome and its primary biochemical out...

A wolf in sheep's clothing: Plague bacteria reveal one of their virulence tricks

...inal wild-type Yersinia. His results confirmed the hypothesis from the structural study: While the wild-type YpkA wreaked havoc on their host cells' cytoskeletons, the mutant left the actin-based skeleton intact. Then, the researchers took it one step further. Stebbins and Prehna worked with collaborators at S...

Changing length of days reverses how estrogen affects aggressiveness in mice

...from the estrogen molecules into the cells. One hypothesis had been that one type of receptor was important i...t conditions? The researchers generated another hypothesis by using microarrays, small chips that examine thousands of genes at a time to see which ones are ac...

Dragonfly's metabolic disease provides clues about human obesity

...People who study metabolic disease should test the hypothesis that changes in gut microbial composition can cause these syndromes." __IMAGE_3 Marden's lab, which studies how insect muscles work and affect the animal's survival and reproductive capabilities, can mechanically isolate single flight muscles a...

Bitter taste identifies poisons in foods

...vides the first direct evidence in support of this hypothesis by establishing that variants of the bitter taste receptor TAS2R38 can detect glucosinolates, a class of compounds with potentially harmful physiological actions, in natural foods. "The findings show that our taste receptors are capable of detecti...

New dwarf buffalo discovered by chance in the Philippines

...sia." The discovery of B. cebuensis supports the hypothesis that the tamaraw evolved to a small size due to it... into a smaller size than the tamaraw supports the hypothesis that the size of an island plays a role in island dwarfing: the smaller the island, the smaller the ...

New moth variety disarms plants guarded by selenium

...n largely obscure. The so-called elemental-defense hypothesis proposes that hyperaccumulated elements serve a defensive function against herbivory, the predation of plants by animals. In their new work, the researchers showed that the selenium in the hyperaccumulator plant species known as prince's plume (S...

New dyslexia theory blames 'noise'

...or drug development," said Lu, who is testing this hypothesis with functional magnetic resonance imaging trials....he [slow processing] ones, are consistent with the hypothesis that ... dyslexic children have difficulty setting their signal filters to optimum and ignoring dist...

Pressured by predators, lizards see rapid shift in natural selection

... to navigating narrow branches and twigs. Their hypothesis was borne out. Six months after the introduction of the predator, Losos found that the Anolis population had dropped by half or more on the islands with the predators, and in comparison to the lizards on the predator-free islands, long legs were more...

Queen bee promiscuity boosts hive health

...North Carolina State University tested the leading hypothesis that queens' promiscuity improves colony disease resistance by boosting the genetic diversity of their offspring, the worker bees. "This required a particularly nasty experiment, in which we inoculated colonies with the most virulent disease of honey...

LSU professor discovers new species

...s. These traits combined to confirm the original hypothesis that the lizard was, in fact, an entirely new species. Austin spent the entire summer of 2006 in New Guinea, his geographical area of expertise, conducting fieldwork with graduate students. He is currently working on research funded by the National...

Two studies on bee evolution reveal surprises

...iscovery, which the researchers say supports a new hypothesis in bee evolution, was published in the Oct. 27 issue of Science. Scientists have long believed that bees first appeared about 120 million years ago -- but previous bee fossil records dated back only about 65 million years. Danforth and Poinar's f...

Genetic surprise confirms neglected 70-year-old evolutionary hypothesis

...empt to investigate the question." Curiously, the hypothesis nearly died twice. Theodosius Dobzhansky, a well-...erile male. This is when Dobzhansky's 70-year-old hypothesis nearly died for good. The reigning theory of speciation says that the genes causing hybrid sterilit...

Why do some queen bees eat their worker bee's eggs?

...is", a major landmark in kin selection theory. His hypothesis was that worker bees, wasps and ants do not reprod...vior textbooks. However, Hamilton's relatedness hypothesis was challenged in 2004 by researchers from the University of Lausanne, Switzerland. They compared 50...

Ape gestures offer clues to the evolution of human communication

...anguage began with gestures as the gestural origin hypothesis of language suggests. This study appears in the current issue of the Proceedings of the National Academy of Sciences. Working with two groups of bonobos (13 animals) and two groups of chimpanzees (34 animals), Yerkes researchers Amy Pollick, PhD, a...

Brain works more chaotically than previously thought

... but also numerous other nerve cells." If this hypothesis is correct, the accepted scientific understanding of the way neurons communicate, which has prevailed for over a hundred years, will have to be revised. In 1897 Sir Charles Sherrington first put forward the idea that chemical messengers are only rele...

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