Bacteria in the gut that are under attack by antibiotics have allies no one had anticipated, a team of Harvard Univ. Wyss Institute scientists has found. Gut viruses that usually commandeer the bacteria, it turns out, enable them to survive the antibiotic onslaught, most likely by handing them genes that help them withstand the drug.
For the first time, researchers have found a particular kind of molecular switch in the food-poisoning bacteria Salmonella Typhimurium under infection-like conditions. This switch, using a process called S-thiolation, appears to be used by the bacteria to respond to changes in the environment during infection and might protect it from harm, researchers report.
A team of researchers has captured images of green alga consuming bacteria, offering a glimpse at how early organisms dating back more than 1 billion years may have acquired free-living photosynthetic cells. This acquisition is thought to have been a critical first step in the evolution of photosynthetic algae and land plants.
The temperature in the permafrost on Ellesmere Island in the Canadian high Arctic is nearly as cold as that of the surface of Mars. So the recent discovery by a McGill University led team of scientists of a bacterium that is able to thrive at -15 C, the coldest temperature ever reported for bacterial growth, is exciting. The bacterium offers clues about some of the necessary preconditions for microbial life on Mars.
Bacteria on a surface wander around and often organize into highly resilient communities known as biofilms. It turns out that they organize in a rich-get-richer pattern similar to the distribution of wealth in the U.S. economy, according to a new study.
Researchers have cautioned that more work is needed to understand how microorganisms respond to the disinfecting properties of silver nanoparticles, increasingly used in consumer goods and for medical and environmental applications. Although nanosilver has effective antimicrobial properties against certain pathogens, overexposure to silver nanoparticles can cause other potentially harmful organisms to rapidly adapt and flourish.
Using the same devious mechanism that enables some bacteria to shrug off powerful antibiotics, scientists have developed solar-powered nanofilters that remove antibiotics from the water in lakes and rivers twice as efficiently as the best existing technology.
They sweep. They swab. They sterilize. And still the germs persist. In U.S. hospitals, an estimated 1 in 20 patients pick up infections they didn't have when they arrived. This causes hospitals to try all sorts of new approaches to stop their spread, including machines that resemble "Star Wars" robots and emit ultraviolet light or hydrogen peroxide vapors.
Individual freedom and social responsibility may sound like humanistic concepts, but an investigation of the genetic circuitry of bacteria suggests that even the simplest creatures can make difficult choices that strike a balance between selflessness and selfishness.
Scientists have revealed how a bacterial enzyme has evolved an energy-efficient method to move long distances along DNA. The findings present further insight into the coupling of chemical and mechanical energy by a class of enzymes called helicases, a widely distributed group of proteins, which in human cells are implicated in some cancers.
New research from Harvard University helps to explain how waterborne bacteria can colonize rough surfaces—even those that have been designed to resist water. A team studied the gut bacterium Escherichia coli, which has many flagella that stick out in all directions. The researchers found that these tails can act as biological grappling hooks, reaching far into nanoscale crevices and latching the bacteria in place.
Pneumonia and other infections sometimes provoke an inflammatory response from the body that is more detrimental than the disease-causing bacteria. Scientists at the University of Pittsburgh School of Medicine discovered a new biological pathway of innate immunity that ramps up inflammation and then identified agents that can block it, leading to increased survival and improved lung function in animal models of pneumonia.
The term "survival of the fittest" refers to natural selection in biological systems, but Darwin's theory may apply more broadly than that. New research from Brookhaven National Laboratory shows that this evolutionary theory also applies to technological systems. The team worked to compare that frequency with which components "survive" in two complex systems: bacterial genomes and operating systems on Linux computers.
Through the misuse and overuse of antibiotics, several types of bacteria have become resistant to drugs that were designed to kill them. The Centers for Disease Control and Prevention estimate that some of these "superbugs" are linked to tens of thousands of deaths in the United States annually, including 14,000 for C. difficile and 19,000 for MRSA. Technology developed by Purdue University researchers and commercialized through a Purdue Research Park-based firm could be effective against the increased number of antibiotic-resistant strains of bacteria in the world.
Certain bacteria can breathe iron like we breathe oxygen. Understanding how they do so will help researchers use the microbes for cleaning up soil contaminants, for trapping carbon dioxide, or for making batteries out of bacteria. Now, a team of researchers report that proteins on the surface of bacteria produce an electric current by simply touching a mineral surface, allowing them to breathe the iron in the rock.
As public health officials sound the alarm about the global spread of drug-resistant bacteria, researchers are working to develop more effective antibiotics to counter this dangerous trend. Now, results from a team including a Princeton University scientist offer a possible solution that uses the bacteria's own byproducts to destroy them.
The biological sources of methane are wide-ranging. However, the conditions have to be always oxygen-free and the exact mechanism has been unclear. A team of researchers in Germany has gained insight into microbiological methane production by explaining the structure of a hydrogenase used by archaebacteria to split hydrogen to produce methane
Microbes from the human mouth are telling Oak Ridge National Laboratory scientists something about periodontitis and more after they cracked the genetic code of bacteria linked to the condition. The research marks the first time scientists have managed to isolate and cultivate this type of bacterium.
Rice University researchers have found a way to divide and modify enzymes to create what amounts to a genetic logic gate. The researchers have created a library of AND gates by mutating a protein from a bacterial virus. The well-understood protein known as T7 RNA polymerase (RNAP) is a strong driver of transcription in cells.
Vaccines that employ weakened but live pathogens to trigger immune responses have inherent safety issues but Yale University researchers have developed a new trick to circumvent the problem—using bacteria’s own cellular mistakes to deliver a safe vaccine. The findings suggest new ways to create novel vaccines that effectively combat disease but can be tolerated by children, the elderly, and the immune-compromised who might be harmed by live vaccines.
A new form of microbial life has been found in water samples taken from a giant freshwater lake hidden under kilometers of Antarctic ice, Russian scientists said Monday. In a prepared statement, the researchers said that the "unidentified and unclassified" bacterium has no relation to any of the existing bacterial types. They touched the lake water Sunday at a depth of 12,366 feet (3,769 m), about 800 miles (1,300 km) east of the South Pole in the central part of the continent.
Like the extraterrestrial creature in the movie Alien, the "extremophile" red alga Galdieria sulphuraria can survive brutal heat and resist the effects of toxins. Scientists were previously unsure of how a one-celled alga acquired such flexibility and resilience. But recently they made an unexpected discovery: Galdieria's genome shows clear signs of borrowing genes from its neighbors.
A researcher has recently attempted to answer to an enigma in medical science: How are bacteria becoming more resistant to antibiotics? According to his theory, bacteria that are non-resistant to antibiotics acquire this resistance accidentally. This occurs because they take up the DNA of other bacteria that are resistant because of their exposure to stress.
A new study has examined how bacteria clog medical devices, and the result isn’t pretty. The microbes join to create slimey ribbons that tangle and trap other passing bacteria, creating a full blockage in a startlingly short period of time. The finding could help shape strategies for preventing clogging of devices such as stents and water filters