Tag: Bacteria

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Science Snippet: Brush Up on Biofilms

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A biofilm is a highly organized community of microorganisms that develops naturally on certain surfaces. Typically, biofilms are made up of microbes and an extracellular matrix that they produce. This matrix can include polysaccharides (chains of sugars), proteins, lipids, DNA, and other molecules. The matrix gives the biofilm structure and helps it stick to a surface.

Formation of a biofilm often involves a process called quorum sensing. In this process, microbes detect when they reach a certain population density and change their behavior in ways that help them function as a community.

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Career Conversations: Q&A with Microbiologist Josephine Chandler

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Josephine (Josie) Chandler, Ph.D., first became interested in science when she took a high school chemistry class. In college, she fell in love with microbiology and ultimately earned a Ph.D. in the field. Today, she’s an associate professor of molecular biosciences at the University of Kansas in Lawrence, where her lab investigates interactions in bacterial communities. By better understanding these interactions, scientists may find new ways to stop infections or break down environmental pollutants—a process known as bioremediation.

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Through the Looking Glass: Microscopic Structures in Many Sizes

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We seldom see microscopic objects next to one another, so it can be difficult to picture how they compare. For instance, it might surprise you that a thousand cold-virus particles could line up across one human skin cell! The largest objects that scientists view through microscopes are about a millimeter (roughly the size of a poppyseed), and they’re about 10 million times larger than the smallest molecules scientists can view: atoms.

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Cool Images: Bewitching Bacteria

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Some bacteria benefit us as part of our microbiome—the vast collection of microorganisms that live in and on our bodies—while others can make us sick. Whether helpful or dangerous, bacteria can appear colorful and striking under a microscope. These photos provide just a small peek into the incredible diversity of these microbes.

A green pattern resembling a flower on a red background. Credit: Liyang Xiong and Lev Tsimring, BioCircuits Institute, UCSD.

This floral pattern emerged when a researcher grew two strains of bacteria—Acinetobacter baylyi (red) and Escherichia coli (green)—together for 2 days in a petri dish. A. baylyi are found in soil and typically don’t pose a threat to humans, although some strains can cause infections. E. coli normally live in the intestines of people and animals. Most strains are harmless, but some can cause food poisoning or other illnesses.

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Pathways: The Superbug Issue

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Cover of Pathways student magazine showing blueish-green virus particles and text that reads, Stop the Spread of Superbugs (Yes, you can help!). Cover of Pathways student magazine.

NIGMS and Scholastic bring you our latest issue of Pathways, which focuses on superbugs—infectious microbes that can’t be fought off with medicines. Viruses that can’t be prevented with vaccines, such as the common cold, and antibiotic-resistant bacteria both fall into this category.

Pathways, designed for students in grades 6 through 12, is a collection of free resources that teaches students about basic science and its importance to health, as well as exciting research careers.

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Shedding Light on Sepsis

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Sepsis is the body’s overactive and extreme response to an infection. It’s unpredictable, can progress rapidly, and affects more than 1.7 million people in the United States each year. Without prompt treatment, it can lead to tissue damage, organ failure, and death. NIGMS supports state-of-the-art sepsis research, including the development of rapid diagnostics and new therapeutics. September is Sepsis Awareness Month, and we’re highlighting a few resources that offer more information about this condition.

Our infographic provides details at a glance on basic statistics and the future of sepsis research. It’s also available in Spanish.

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Exploring Nature’s Treasure Trove of Helpful Compounds

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An oblong shell with white-and-brown markings. A cone snail shell. Credit: Kerry Matz, University of Utah.

Over the years, scientists have discovered many compounds in nature that have led to the development of medications. For instance, the molecular structure for aspirin came from willow tree bark, and penicillin was found in a type of mold. And uses of natural products aren’t limited to medicine cabinet staples and antibiotics. A cancer drug was originally found in the bark of the Pacific yew tree, and a medication for chronic pain relief was first isolated from cone snail venom. Today, NIGMS supports scientists in the earliest stages of investigating natural products made by plants, fungi, bacteria, and animals. The results could inform future research and bring advances to the field of medicine.

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Sepsis: Using Big Data to Cut a Killer Down to Size

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A geographical outline of the U.S. with the text More than 1.7 million people get sepsis each year in the United States. View the full infographic for more facts about sepsis.

Sepsis is a serious medical condition caused by an overwhelming response to infection that damages tissues and organs. It’s unpredictable, progresses quickly, can strike anyone, and is a leading cause of hospital-related deaths. In the U.S. alone, nearly 270,000 people die each year from sepsis. Those who survive sepsis often end up in the hospital again, and some have long-term health complications. Early treatment is key for many patients to survive sepsis, yet doctors can’t easily diagnose it because it’s so complex and each patient is different.

Despite decades of research, sepsis remains a poorly understood condition with limited diagnostic tools and treatment. To tackle these obstacles, scientists Vincent Liu, Christopher Seymour, and Hallie Prescott have started using a “big data” approach, which relies on complex computer programs to sift through huge amounts of information. In this case, the computers analyze data such as demographic information, vital signs, and routine blood tests in the electronic health records of sepsis patients. The goal is to find patterns in the data that might help doctors understand, predict, and treat sepsis more effectively.

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The Meat of the Matter: Learning How Gut Microbiota Might Reduce Harm from Red Meat

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Drawing of intestines with a magnifying glass showing bacteria within the intestine.Microbiota in the intestines. Credit: iStock.

Research on how diet impacts the gut microbiota has rapidly expanded in the last several years. Studies show that diets rich in red meat are linked to diseases such as colon cancer and heart disease. In both mice and humans, researchers have recently discovered differences in the gut microbiota of those who eat diets rich in red meat compared with those who don’t. This is likely because of a sugar molecule in the red meat, called N-glycolylneuraminic acid (Neu5Gc), that our bodies can’t break down. Researchers believe the human immune system sees Neu5Gc as foreign. This triggers the immune system, causing inflammation in the body, and possibly leads to disease over time.

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RNA Polymerase: A Target for New Antibiotic Drugs?

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DNA, with its double-helix shape, is the stuff of genes. But genes themselves are only “recipes” for protein molecules, which are molecules that do the real heavy lifting (or do much of the work) inside cells.

RNAP illustrated as a crab claw, clamping on a DNA double helix. Artist interpretation of RNAP grasping and unwinding a DNA double helix. Credit: Wei Lin and Richard H. Ebright.

Here’s how it works. A molecular machine called RNA polymerase (RNAP) travels along DNA to find a place where a gene begins. RNAP uses a crab-claw-like structure to grasp and unwind the DNA double helix at that spot. RNAP then copies (“transcribes”) the gene into messenger RNA (mRNA), a molecule similar to DNA.

The mRNA molecule travels to one of the cell’s many protein-making factories (ribosomes), which use the mRNA message as instructions for making a specific protein.

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