bacterium - definition. What is bacterium
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DOMAIN OF MICRO-ORGANISMS
Bacterial; Schizomycetes; Bactera; Economic importance of bacteria; Ecnomic importance of bacteria; Bacterial proteins; Schizomycet; Antibodies, bacterial; Eubacter; Bacterias; Bacterial breakdown; Bacteriae; Eubacteria; Bacterium; Bacterial shape; Bacterial predator; Bacterial predators; Bacterial predation; Predatory bacteria; Types of bacteria; Bacteria morphology; Bacterial Index (BI); Bacterial index; Bacium; Bacteria cells; Harmful bacteria; Bacteria A2Z; Human bacteria; Microscopic discovery of bacteria
  •  bibcode = 2019NatCo..10.5477Z }}</ref>
  • [[Antonie van Leeuwenhoek]], the first [[microbiologist]] and the first person to observe bacteria using a [[microscope]].
  • Rod-shaped ''[[Bacillus subtilis]]''
  • isbn=978-0-7817-8215-9 }}</ref>
  •  p=74}}
  • electron micrograph]] of ''[[Halothiobacillus neapolitanus]]'' cells with [[carboxysome]]s inside, with arrows highlighting visible carboxysomes. Scale bars indicate 100 nm.
  • Transmission electron micrograph of ''[[Desulfovibrio vulgaris]]'' showing a single flagellum at one end of the cell. Scale bar is 0.5 micrometers long.
  •  doi = 10.1371/journal.pbio.0030045 }}</ref>
  • ''[[Helicobacter pylori]]'' electron micrograph, showing multiple flagella on the cell surface
  •  url = http://urn.fi/URN:NBN:fi:jyu-202006043941 }}</ref>
  • The different arrangements of bacterial flagella: A-Monotrichous; B-Lophotrichous; C-Amphitrichous; D-Peritrichous
  • doi=10.3201/eid0706.010604 }}</ref>
  • ''[[Neisseria gonorrhoeae]]'' and pus cells from a penile discharge ([[Gram stain]])
  • In [[bacterial vaginosis]], beneficial bacteria in the vagina (top) are displaced by pathogens (bottom). Gram stain.
  • doi-access=free }}</ref>
  • Structure and contents of a typical [[Gram-positive]] bacterial cell (seen by the fact that only ''one'' cell membrane is present).
  •  p=xi}}
  • Colour-enhanced scanning electron micrograph showing ''[[Salmonella typhimurium]]'' (red) invading cultured human cells
  • ''Streptococcus mutans'' visualised with a Gram stain.
  • Many bacteria reproduce through [[binary fission]], which is compared to [[mitosis]] and [[meiosis]] in this image.

Bacterium         
·noun A microscopic vegetable organism, belonging to the class Algae, usually in the form of a jointed rodlike filament, and found in putrefying organic infusions. Bacteria are destitute of chlorophyll, and are the smallest of microscopic organisms. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. ·see Bacillus.
bacterium         
Bacterium is the singular of bacteria
.
bacterium         
[bak't??r??m]
¦ noun (plural bacteria -r??) a member of a large group of unicellular microorganisms (prokaryotes) which have cell walls but lack an organized nucleus and other structures, and include numerous disease-causing forms.
Derivatives
bacterial adjective
bacterially adverb
Origin
C19: mod. L., from Gk bakterion, dimin. of bakteria 'rod, cane' (because the first ones to be discovered were rod-shaped).
Usage
Bacteria, the plural form of bacterium, is sometimes mistakenly treated as a singular form.

ويكيبيديا

Bacteria

Bacteria ( (listen); singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. 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. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationships with plants and animals. Most bacteria have not been characterised and there are many species that cannot be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology.

Humans and most other animals carry millions of bacteria. Most are in the gut, and there are many on the skin. Most of the bacteria in and on the body are harmless or rendered so by the protective effects of the immune system, and many are beneficial, particularly the ones in the gut. However, several species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy, tuberculosis, tetanus and bubonic plague. The most common fatal bacterial diseases are respiratory infections. Antibiotics are used to treat bacterial infections and are also used in farming, making antibiotic resistance a growing problem. Bacteria are important in sewage treatment and the breakdown of oil spills, the production of cheese and yogurt through fermentation, the recovery of gold, palladium, copper and other metals in the mining sector, as well as in biotechnology, and the manufacture of antibiotics and other chemicals.

Once regarded as plants constituting the class Schizomycetes ("fission fungi"), 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 from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.

أمثلة من مجموعة نصية لـ٪ 1
1. The bacterium attacks people‘s intestines, causing severe diarrhea and dehydration.
2. In Haifa‘s Rambam Hospital, some 70 patients caught the bacterium.
3. This produces a bacterium that flavours the cheese.
4. The dominant bacterium does not yet have a scientific name.
5. It is carried by the bacterium Treponema palladium.