They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust.
Las bacterias son microorganismos procariotas que presentan un tamaño de unos pocos micrómetros (por lo general entre 0,5 y 5 μm de longitud) y diversas formas, incluyendo esferas ( cocos ), barras ( bacilos ), filamentos curvados ( vibrios) y helicoidales ( espirilos y espiroquetas ). 6 Las bacterias son células procariotas, por lo que, a ...
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- Reproduction and Gene Transfer
- History of Their Classification
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A bacterium reproduces (creates more bacteria) by dividing in halfand creating two "daughter" cells. Each daughter is identical in shape to the parent. Bacteria do not have sexes, but they do transmit DNA by several kinds of horizontal gene transfer. This is how they share resistance to antibiotics from one strain to another. The complete DNA seque...
Bacteria vary widely in size and shape, but in general they are at least ten times larger than viruses. A typical bacterium is about 1 µm (one micrometer) in diameter, so a thousand bacteria lined up would be one millimeter long. There are about five nonillion (5×1030) bacteria on Earth. Bacteria are identified and grouped by their shapes. Bacilli ...
Pathogenicbacteria, the harmful kind, enter the human body from the air, water or food. Once inside, these bacteria attach themselves to or invade specific cells in our respiratory system, digestive tract or in any open wound. There they begin to reproduce and spread while using your body's food and nutrients to give them energy to help them reprod...
Some bacteria are extremophiles. Some microbes thrive inside rocks up to 580 meters below the sea floor under 2.6 kilometers of ocean off the Pacific Northwest of the United States.According to one of the researchers, "You can find microbes everywhere — they're extremely adaptable to conditions, and survive wherever they are."
Viruses were the first and are the most serious enemies of bacteria. Everywhere bacteria are, they get attacked by viruses. The viruses which attack bacteria are called bacteriophages. Something is now known about how bacteria protect themselves against viruses. Most bacteria have CRISPR–Cas systems as an adaptive defence against viruses. These let...
All modern ideas start with the sequence analysis of DNA and RNA. In 1987, Carl Woese, the forerunner of the molecular phylogeny revolution, divided bacteria into 11 divisions based on 16S ribosomal RNA(SSU) sequences: 1. Proteobacteria: Purple bacteriaand their relatives 2. alpha subdivision (purple non-sulfur bacteria, rhizobacteria, Agrobacteriu...
List of bacteria genera. This article lists the genera of the bacteria. The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI). However many taxonomic names are taken from the Genome Taxonomy Database release 06-RS202.SyperphylumPhylumAuthoritySynonymsWhitman et al. 2018Salam et al. 2020High G+C Gram-positive bacteriaAnantharaman et al. 2016Whitman et al. 2018OP10 "Abditibacteriota" (FBP)
This is a list of bacteria that are significant in medicine. It is not intended as an exhaustive list of all bacterial species: that should be at List of bacteria . For viruses, see list of viruses .
Die Bakterien (Bacteria) ( Singular das Bakterium, veraltend auch die Bakterie; von altgriechisch βακτήριον baktērion ‚Stäbchen‘, ugs. auch Bazille) bilden neben den Eukaryoten und Archaeen eine der drei grundlegenden Domänen, in die alle Lebewesen eingeteilt werden.