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Tag: "poison" at biology news

Detecting poisons in nectar is an odour-ous task for honeybees

...eet or even toxic nectars. Why plants would try to poison the honeybees they wish to attract is a scientific mystery. The honeybee, which accounts for the pollination of at least 1/3 of the world’s crop plants, may encounter such poisoned nectar in common crop and garden plants such as Rhododendrons and a...

Secret of worm's poison pill box protein could produce new natural insecticide

... from a bacterium acts like a cunningly designed poison pill box that could now be used as a basis of a ne...of XptA1 these are XptB1 and XptC1). This forms a poison "complex" which makes the XptA1 300 times more toxic to the caterpillars than it would be by itself....

Shedding new light on proteorhodopsin

...through either oxygen depletion or the respiratory poison azide." The Berkeley researchers monitored single cells of E. coli and observed the response to light of the proton motive force (pmf), the electrochemical potential of protons across cellular membranes that bacteria use as the energy source to, a...

Nonvenomous Asian snakes 'borrow' defensive poison from toxic toads

...ff predators? What if they could borrow a dose of poison by eating toxic toads, then recycling the toxins? That's exactly what happens in the relationship between an Asian snake and a species of toad, according to a team of researchers funded by the National Science Foundation (NSF) Division of Integrat...

Hope for a more effective and less toxic cancer drug

...gy for attacking cancer. Rather than attempting to poison the rogue cells, the new drug attempts to reactivate the healthy and normal cell death program that failed to kill the unwanted cells on cue. WEHI's leading researcher with the assessment project, Dr David Huang, explains, "Normally, the cell dea...

Poison dart frog mimics gain when birds learn to stay away

Studying neotropical poison dart frogs, biologists at the University of Texas ...isonous neighbor, but by looking like a frog who's poison packs less punch. The Texas biologists studied three species of poison dart frogs--one highly toxic...

Mayo Clinic researchers challenge sepsis theory

...ll causes of sepsis syndrome -- only the bacterial poison cause -- which was described by a 19th century researcher as "the putrid gift." "Our work is the first to show that this change in receptors in the body is the first true step in the sepsis syndrome, rather than the introduction of a poison," explai...

Unraveling the mysteries of poison

... synthesis procedures and looked at the example of poison from the north African scorpion Androctonus maure...toxin affected the channel, it turned out that the poison attaches to a particular area of the channel ?the pore region ?and changes the area's structure. The...

Why nerve cells work faster than the theory allows

...cking a part of the sodium channels with the nerve poison tetrodoxin, so that the channels that still functioned lay so scattered in the membrane, that they were not able to cooperate. Furthermore, the researchers were able to show that the cells probably used this novel mechanism to differentiate between...

Poison + water = hydrogen. New microbial genome shows how

...or any microbe to sporulate. Thus studies of this poison eating microbe may help us better understand the biology of the bacterium that causes anthrax. Building off this work, TIGR scientists are leveraging the information from the genome of this organism to study the ecology of microbes living in diverse...

Drunken elephants: The marula fruit myth

...ch is home to a beetle pupae traditionally used to poison arrow tips. ...

Pretreating rogue cancer cells with aspirin cripples their resistance to targeted therapy

...s are monkey-faced bats, cloud rats, golden moles, poison frogs, exotic parrots and hummingbirds, a hamster ...ng the most intriguingly-named are: the Bloody Bay poison frog, the volcano rabbit, the Ruo River screeching frog, the Bramble Cay mosaic-tailed rat, the marv...

New study pinpoints epicenters of Earth's imminent extinctions

...s are monkey-faced bats, cloud rats, golden moles, poison frogs, exotic parrots and hummingbirds, a hamster ...ng the most intriguingly-named are: the Bloody Bay poison frog, the volcano rabbit, the Ruo River screeching frog, the Bramble Cay mosaic-tailed rat, the marv...

Langerhans cells regulate immune reactions in the skin

...these mice to create hypersensitivity similar to a poison ivy reaction. They expected that mice without Langerhans cells would have less immune response in the skin. "Unexpectedly, instead of a decreased immune response to contact hypersensitivity, we found a reproducible and significant increase," said f...

Jefferson scientists identify gene defect leading to abnormal skin development and cancer

...y Commission (GLFC) controls lamprey by means of a poison that kills lamprey larvae in streambeds. It also k...c form of the newly found pheromone to replace the poison by luring lamprey to traps and sterilizing the males, the researchers said. Using the pheromone woul...

Leading lampreys to slaughter: Pheromone for scourge of Great Lakes identified

...y Commission (GLFC) controls lamprey by means of a poison that kills lamprey larvae in streambeds. It also k...c form of the newly found pheromone to replace the poison by luring lamprey to traps and sterilizing the males, the researchers said. Using the pheromone woul...

Ants, not evil spirits, create devil's gardens in the Amazon rainforest, study finds

...species that produces its own natural herbicide to poison unwanted plants. Stanford University biologist D...mptly attacked the untreated saplings, injecting a poison called formic acid into the leaves, which began to die within 24 hours. "Most of the leaves on these...

Vineyard weeds found to host Pierce's disease of grapes

...bur-sage, morning glory, horseweed, sacred datura, poison hemlock, and fava bean were most frequently infected. "Our study confirmed that plant species cannot be simply classified as either 'hosts' or 'nonhosts' of X. fastidiosa, but vary considerably among plant species in supporting growth and movement of...

Device traps, disables harmful bacteria

...a, culturable bacteria and airborne endotoxin -- a poison present in gram-negative bacterial cell walls that can cause severe inflammatory responses -- with and without the air filters operating under similar conditions. They compared the performance of the filters twice, one year apart, and found that the ...

Researchers find first evidence of venom system in extinct mammal

..., and, Fox noted, the groove resembled the grooved poison fangs found in some kinds of modern venomous snakes. He added that the fact that the walls of the groove are covered with enamel indicates the groove is not a product of post-mortem exposure and splitting but rather is the natural design of the tooth...

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