News tagged with bacterium
(Medical Xpress)—The feared Legionella pneumophila is responsible for legionellosis, an infectious disease that can lead to pneumonia. To infect humans, this pathogen has developed a complex method that allows it to camouflage ...
Diseases, Conditions, Syndromes 16 hours ago | not rated yet | 0
Scientists at Montana State University have developed a therapeutic that has potential as a biological drug or probiotic food product to combat many of the more than 80 autoimmune disorders that affect some 23.5 million people ...
Medical research May 17, 2013 | 4.2 / 5 (5) | 0
The bacterium M. pneumoniae is carried at high rates in the upper respiratory tracts of healthy children and usual diagnostic tests cannot differentiate between such asymptomatic carriage and actual respiratory tract infect ...
Diseases, Conditions, Syndromes May 14, 2013 | not rated yet | 0
(Medical Xpress)—Akkermansia muciniphila is one of the many microbes that live in our intestines. This bacterium, which feeds on the intestine's mucus lining, comprises between 3 and 5 percent of the gut microbes of hea ...
Medical research May 14, 2013 | 4.8 / 5 (11) | 0 |
Haiti cholera mutations could lead to more severe disease: Strain is evolving to be more like virulent 1800s cholera
The cholera strain that transferred to Haiti in 2010 has multiple toxin gene mutations that may account for the severity of disease and is evolving to be more like an 1800s version of cholera, reports a new Northwestern Medicine ...
Diseases, Conditions, Syndromes Apr 16, 2013 | 4 / 5 (1) | 0 |
Research led by David H. Martin, MD, Professor and Chief of Infectious Diseases at LSU Health Sciences Center New Orleans, has found that a common sexually transmitted infection-causing parasite "cultivates" bacteria beneficial ...
Diseases, Conditions, Syndromes Apr 02, 2013 | 5 / 5 (3) | 0
(Medical Xpress)—Researchers at UC Davis have shown how the innate immune system distinguishes between dangerous pathogens and friendly microbes. Like burglars entering a house, hostile bacteria give themselves away by ...
Immunology Apr 01, 2013 | 4.3 / 5 (3) | 0 |
(HealthDay)—The TOBI Podhaler (tobramycin inhalation powder) has been approved by the U.S. Food and Drug Administration to treat cystic fibrosis patients infected with Pseudomonas aeruginosa, a bacterium that can damage ...
Medications Mar 25, 2013 | not rated yet | 0
An innovative anti-bacterial spray that will kill MRSA is being developed by Norwich Research Park scientists thanks to funding from the University of East Anglia.
Diseases, Conditions, Syndromes Mar 21, 2013 | not rated yet | 0
When timing is everything: Research says beneficial mutations need specific circumstances to win out
When it comes to the sort of beneficial mutations that drive natural selection, there's new evidence that, evolutionarily speaking, timing is everything.
Genetics Mar 20, 2013 | 5 / 5 (1) | 4 |
An outbreak of tuberculosis in the skid row area of downtown Los Angeles may have exposed up to 4,500 individuals to the bacterium that causes the deadly disease and has left federal officials scrambling ...
Medical research Feb 28, 2013 | 5 / 5 (1) | 0 |
Syphilis is on the rise worldwide and there is an urgent need for reliable and rapid screening, particularly for people who live in areas where access to healthcare is limited. An international research team, led by scientists ...
Diseases, Conditions, Syndromes Feb 27, 2013 | not rated yet | 0
Scientists at the University of Southampton have taken a significant and important step in keeping people safe from the most common form of meningitis in the UK.
Diseases, Conditions, Syndromes Feb 27, 2013 | not rated yet | 0
A new form of genetic testing of the bacteria that causes tuberculosis can provide better information on TB transmission and also trace TB outbreaks more accurately than the current standard test, according to a study from ...
Diseases, Conditions, Syndromes Feb 19, 2013 | not rated yet | 0 |
(Medical Xpress)—In what could be an early step toward new treatments for people with osteoporosis, scientists at Michigan State University report that a natural probiotic supplement can help male mice produce healthier ...
Medical research Feb 14, 2013 | 3 / 5 (1) | 0
Actinobacteria (high-G+C) Firmicutes (low-G+C) Tenericutes (no wall)
Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Deinococcus-Thermus Fusobacteria Gemmatimonadetes Nitrospirae Proteobacteria Spirochaetes Synergistetes
Acidobacteria Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Dictyoglomi Fibrobacteres Planctomycetes Thermodesulfobacteria Thermotogae
The bacteria [bækˈtɪərɪə] (help·info) (singular: bacterium)[α] are a large group of unicellular microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals. Bacteria are ubiquitous in every habitat on Earth, growing in soil, acidic hot springs, radioactive waste, water, and deep in the Earth's crust, as well as in organic matter and the live bodies of plants and animals. There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water; in all, there are approximately five nonillion (5×1030) bacteria on Earth, forming much of the world's biomass. Bacteria are vital in recycling nutrients, with many steps in nutrient cycles depending on these organisms, such as the fixation of nitrogen from the atmosphere and putrefaction. However, most bacteria have not been characterized, and only about half of the phyla of bacteria have species that can be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology.
There are approximately ten times as many bacterial cells in the human flora of bacteria as there are human cells in the body, with large numbers of bacteria on the skin and as gut flora. The vast majority of the bacteria in the body are rendered harmless by the protective effects of the immune system, and a few are beneficial. However, a few species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy and bubonic plague. The most common fatal bacterial diseases are respiratory infections, with tuberculosis alone killing about 2 million people a year, mostly in sub-Saharan Africa. In developed countries, antibiotics are used to treat bacterial infections and in agriculture, so antibiotic resistance is becoming common. In industry, bacteria are important in sewage treatment, the production of cheese and yoghurt through fermentation, as well as in biotechnology, and the manufacture of antibiotics and other chemicals.
Once regarded as plants constituting the class Schizomycetes, bacteria are now classified as prokaryotes. Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved independently from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.
For more information about Bacteria, read the full article at
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