Purple bacteria contain pigments that allow them to use sunlight as their source of energy. Small as they are, these microbes can teach us a lot about life on Earth, because they have been around longer than most other organisms on the planet. A Univ. of Miami physicist recently found that these organisms can also survive in the presence of extreme alien light.
Using several imaging techniques, Lawrence Berkeley National Laboratory scientists found that a common soil bacterium stays connected by a network of chain-like membranes. They believe the bacterium uses its network to coordinate social activities—such as evading bacterial enemies and snaring prey—without revealing its location.
Microbiologists in France are reinvigorating a way of battling C. difficile infections that they hope will help overcome the growing problem of antibiotic resistant superbugs in hospitals. Using a model human colon, the researchers showed that the administration of a specific bacteriophage significantly reduced toxins and the number of C. difficile cells produced without significantly affecting the other members of the gut microbiota.
The interior of a living cell is a crowded place, with proteins and other macromolecules packed tightly together. A team of scientists at Carnegie Mellon Univ. has approximated this molecular crowding in an artificial cellular system and found that tight quarters help the process of gene expression, especially when other conditions are less than ideal.
Scientists at the Univ. of East Anglia are developing a new class of anti-cancer drugs that are not only powerful but also circumvent a primary cause of resistance to chemotherapy. The work is inspired by nature’s fungus farmer, the leaf cutter ant.
On Monday, the National Academy of Sciences announced a three-year grant to chemist Vincent Rotello at the University of Massachusetts Amherst to develop, test and deploy new, sensitive, reliable and affordable inkjet-printed, nanoparticle-based test strips for detecting disease-causing bacteria in drinking water.
Biomaterials are susceptible to microbial colonization, which is why silver is often added to reduce the adhesion rate of bacteria. However, a recent study by researchers in Portugal suggests that—in one material—increasing levels of silver may indirectly promote bacterial adhesion instead of decrease it.
Research at the University of Massachusetts Amherst has revealed how protein degradation is critical to cell cycle progression and bacterial development. The team used a combination of biochemistry and mass spectrometry to “trap” scores of new candidate substrates of the protease ClpXP. These substrates cover all aspects of bacterial growth and development.
By rerouting the metabolic pathway that makes fatty acids in E. coli bacteria, researchers at Harvard University have devised a new way to produce a gasoline-like biofuel. According to the scientists, who are tweaking metabolic pathways in bacteria, new lines of engineered bacteria can tailor-make key precursors of high-octane biofuels that could one day replace gasoline.
Scientists at the University of Texas at San Antonio and the U.S. Army Institute of Surgical Research have developed a microarray platform for culturing fungal biofilms that holds 1,200 individual cultures of fungi or bacteria. The nano-scale platform technology could one day be used for rapid drug discovery for treatment of any number of fungal or bacterial infections, or even as a rapid clinical test to identify antibiotic drugs.
Bacterial DNA may integrate into the human genome more readily in tumors than in normal human tissue, scientists have found. The researchers analyzed genomic sequencing data available from the Human Genome Project, the 1,000 Genomes Project and The Cancer Genome Atlas. They considered the phenomenon of lateral gene transfer, the transmission of genetic material between organisms in a manner other than traditional reproduction.
A Cornell Univ. study offers further proof that the divergence of humans from chimpanzees some 4 to 6 million years ago was profoundly influenced by mutations to DNA sequences that play roles in turning genes on and off. The study provides evidence for a 40-year-old hypothesis that regulation of genes must play an important role in evolution since there is little difference between humans and chimps in the proteins produced by genes.
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.