Microbiology

Television commercials assure us that probiotic products are good for our health, with claims ranging from improved digestion to managing allergies and colds,

If so, why wouldn't plants also benefit from certain microbes?

One Shake Shack French fry may lead you to eat a whole batch, and don't even get started on the power of Doritos. According to a new study using rats, that high-fat indulgence literally changes the populations of bacteria residing inside the gut and also alters the signaling to the brain.

The result? The brain no longer senses signals for fullness, which can cause overeating--a leading cause of obesity. 

The findings presented this week at the Annual Meeting of the Society for the Study of Ingestive Behavior liken a high fat diet to how a sudden significant shift in temperature might impact the people who live in the affected area: Some people will be fine. Others will become ill.

Trees that can tolerate soil pollution are also better at defending themselves against pests and pathogens.

While studying the presence of genetic information (RNA) from fungi and bacteria in the trees, the researchers found evidence of a very large amount of RNA from a very common plant pest called the two-spotted spidermite.

99% of spidermite RNA was in higher abundance in trees without contamination, suggesting that the polluted plant's defense mechanisms, used to protect itself against chemical contamination, improves its resistance to a biological invader. 

In a step that they say overturns traditional assumptions and practice, researchers at the Tata Institute of Fundamental Research, Mumbai and Institute for Plasma Research, Gandhi Nagar have fashioned bacteria to emit intense, hard x-ray radiation.

When one thinks of hard x-rays and bacteria it is usually that the bacteria are at the receiving end of the x-ray source - being imaged, irradiated for some modification or simply assessed for radiation damage. One hardly thinks of using bacteria as a source of x-rays, far from turning them into the brightest among such sources.

A collaborative group of Japanese researchers has demonstrated that the Earth's daily rotation period (24 hours) is encoded in the KaiC protein at the atomic level, a small, 10 nm-diameter biomolecule expressed in cyanobacterial cells.

The results of this joint research will help elucidate a longstanding question in chronobiology: How is the circadian period of biological clocks determined? The results will also help understand the basic molecular mechanism of the biological clock. This knowledge might contribute to the development of therapies for disorders associated with abnormal circadian rhythms.

To predict how a seasonal influenza epidemic will spread across the United States, one should focus more on the mobility of people than on their geographic proximity, a new study suggests. Their results mark the first time genetic patterns for the spread of flu have been detected at the scale of the continental United States.

"We found that the spread of a flu epidemic is somewhat predictable by looking at transportation data, especially ground commuter networks and H1N1," says Brooke Bozick, who led the study as a graduate student in Emory's Population Biology, Ecology and Evolution program. "Finding these kinds of patterns is the first step in being able to develop targeted surveillance and control strategies."

When you think of iron, you probably think of anvils and suits made by Tony Stark - iron is ore that comes from a mine. 

Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago. 

Clark Johnson, a professor of geoscience at the University of Wisconsin-Madison, and former postdoctoral researcher Weiqiang Li examined samples from the banded iron formation in Western Australia. Banded iron is the iron-rich rock found in ore deposits worldwide, from the proposed iron mine in Northern Wisconsin to the enormous mines of Western Australia. These ancient deposits, up to 150 meters deep, were begging for explanation. 

Bacteria and viruses have an obvious role in causing infectious diseases, but microbes have also been identified as the surprising cause of other illnesses, including cervical cancer (Human papilloma virus) and stomach ulcers (H. pylori bacteria).

A new study by University of Iowa microbiologists now suggests that bacteria may even be a cause of one of the most prevalent diseases of our time - Type 2 diabetes.

The research team led by Patrick Schlievert, PhD, professor and DEO of microbiology at the UI Carver College of Medicine, found that prolonged exposure to a toxin produced by Staphylococcus aureus (staph) bacteria causes rabbits to develop the hallmark symptoms of Type 2 diabetes, including insulin resistance, glucose intolerance, and systemic inflammation.

The modern sedimentary environment contains a diversity of microbes that interact very closely with the sediments, sometimes to such an extent that they form "biosediments."

But can such a phenomenon be fossilized? How far back in time can "biosedimentation" be traced? In a study for Geology, Frances Westall and colleagues examine some of the oldest rocks on Earth, in the Barberton Greenstone Belt, South Africa (older than 3.3 billion years), to answer this question.

Westall and colleagues use multi-scale methods to document the simultaneous presence of diverse types of microorganisms, including phototrophs and chemotrophs, directly interacting with coastal volcanic sediments that were bathed by hydrothermal fluids.

Antibiotic-resistant bacteria are on the rise and they pose a global threat to public health. Common antibiotics are often ineffective in treating infectious diseases because pathogens acquire resistance genes. These antimicrobial resistance genes are obtained in different ways.

There are different explanations for how resistances are transferred and a now study found phages -
viruses that exclusively infect bacteria
- in chicken meat that are able to transfer antimicrobial resistance to bacteria.  Phages do not directly pose a risk to humans because they can only infect bacteria. No other cells or organisms can be infected.