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Tag: "bacteria" at biology news

Simulations unravel outer membrane transport mechanism

...ngly model a critical part of a mechanism by which bacteria take up large molecules. Credit: Photo by L. Brian...ly modeled a critical part of a mechanism by which bacteria take up large molecules. Their findings provide a rare window on the complex interplay of proteins i...

The insect vector always bites twice

...ens responsible for these diseases can be viruses, bacteria or protozoans which are passed on to humans by an arthropod vector, most often a dipteran insect. This becomes infected when it feeds, taking blood from an infected vertebrate host. The pathogenic agent finds conditions to reproduce and proliferate i...

A new plant-bacterial symbiotic mechanism promising for crop applications

...ks to its ability to live in association with soil bacteria of the Rhizobium, genus, capable of fixing nitrogen from the air. When these bacteria come into contact with their host plant, they trigger in the roots the formation and development of ...

Pesticides choke pathway for nature to produce nitrogen for crops

...erfere with the ability of legumes to recruit soil bacteria needed to provide a natural fertilizer to crops. C...tions to specific receptors (NodD) inside rhizobia bacteria living in root nodules in the soil. Rotation legume crops such as alfalfa and soybeans require such ...

New bacterium discovered -- related to cause of trench fever

...Francisco General Hospital Medical Center. “The bacteria were eating away a bone in the arm of an AIDS pati...infections in AIDS patients. Identification of the bacteria required laboratory studies of some of the microbes’ DNA sequences. She was surprised to find t...

Newly found sensing system enables certain bacteria to resist human immune defenses

...iscovered a survival mechanism in a common type of bacteria that can cause illness. The mechanism lets the bacteria protect itself by warding off attacks from antimicrobial peptides (AMPs), which are defense molecule...

Microbes at work cleaning up the environment

...robial protein to improve water quality. But some bacteria are doing just that to protect themselves from pot...d Lawrence Berkeley National Laboratory found that bacteria from an abandoned mine excrete proteins that cause metal nanoparticles to aggregate. The bacteria ar...

Bacteria ferry nanoparticles into cells for early diagnosis, treatment

...rchers at Purdue University have shown that common bacteria can deliver a valuable cargo of "smart nanoparticl...searchers attached nanoparticles to the outside of bacteria and linked DNA to the nanoparticles. Then the nanoparticle-laden bacteria transported the DNA to the...

In nature, proteins sweep up nanoparticles

...ry (Berkeley Lab) have discovered a world in which bacteria emit proteins that sweep up metal nanoparticles in...by underground currents. Precisely how and why the bacteria undertake this bit of housecleaning remains a mystery, but it suggests that proteins could play a ke...

Staphylococcus aureus hides out in cells

...human and animal infections, Staphylococcus aureus bacteria may evade the immune system’s defences and dodge a...lic functions and transport shut down, putting the bacteria in a dormant state. Simultaneously, production of toxins potentially lethal for the epithelial cells...

Helping chlorine-eating bacteria clean up toxic waste

Cornell researchers hope to learn how certain bacteria that break down pollutants do their job and then t...dures haven't provided enough answers, because the bacteria are hard to grow in a petri dish, said Ruth Richardson, Cornell assistant professor of civil and env...

Understanding why C. difficile causes disease -- it's hungry

...s disease have come to a simple conclusion -- the bacteria do it because they are starving. That just might h...consistent with the view that most disease-causing bacteria express their pathogenicity when they are hungry," says Abraham Sonenshein, professor at the Sackler...

How plague-causing bacteria disarm host defense

...otein called YpkA, one of several effectors of the bacteria Yersinia – the pathogen responsible for the Middle... The genus Yersinia includes three species of bacteria that are pathogenic to humans: Y. pestis is perhaps the most infamous, being responsible for the bub...

Genome of Clostridium botulinum reveals the background to world's deadliest toxin

...C. botulinum shows us one extreme of the ways that bacteria can make the most of animal hosts," explained Dr J... demonstrates the wide range of strategies used by bacteria to enhance their chances of survival. For the Clostridia, these range from the approach used by Cdif...

Early exposure to indoor fungus molecules may protect infants against future allergies

... "This eliminates the natural competition among bacteria and fungi, so the surviving microbes are often the infectious ones that can develop resistance to drugs designed to eliminate them." Iossifova says further research is needed to determine how early microbial exposures affect the development of ce...

Scientists discover rare 'gene-for-gene' interaction that helps bacteria kill their host

...f Science, scientists have found that Photorhabdus bacteria produce an antibiotic which inhibits the work of a... identified so far. Photorhabdus is a family of bacteria that in relatively small concentrations can kill insects - between 10-100 cells of it are typically ...

Anthrax paralyzes immune cells with lethal toxin, UF research shows

... and induces them to form the filaments, which the bacteria use to navigate around the body. "We used one bacterium to weed out another. I'm not aware of anyone ever doing that," Southwick said. "In an individual cell, you can't figure out where the actin is assembling and what's controlling it. But Lister...

New bacteria test could improve quality of fruit and vegetable juice

... juice processing companies, which monitor for the bacteria during the processing and final product stage. He said the DNA technique in combination with infrared spectroscopy technique won't cause long delays in production. "This combination will be the best way to quickly and accurately detect...

UCLA AIDS Institute researchers find a peptide that encourages HIV infection

...structure in monkeys that defends against viruses, bacteria and other foreign invaders is reversed, the peptide actually encourages infection with HIV. The findings, published in the April issue of AIDS Research and Human Retroviruses, could pave the way for the use of such peptides in gene therapy using HIV...

Researchers attach genes to minichromosomes in maize

...are multiply resistant to viruses, insects, fungi, bacteria and herbicides, and for the development of proteins and metabolites that can be used to treat human illnesses. In a paper published in the Proceedings of the National Academy of Sciences (PNAS), Weichang Yu, Fangpu Han, Zhi Gao, Juan M. Vega and Jam...

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