Streptococcus pneumoniaeStreptococcus pneumoniae, or pneumococcus, is a Gram-positive, spherical bacteria, alpha-hemolytic member of the genusStreptococcus. S. pneumoniae cells are usually found in pairs (diplococci) and do not form spores and are non motile. As a significant human pathogenic bacteriumS. pneumoniae was recognized as a major cause of pneumonia in the late 19th century, and is the subject of many humoral immunity studies.
BacteriaDomain of microorganismsSynonyms"Bacteria" (Cohn 1872) Cavalier-Smith 1983"Bacteria" Haeckel 1894"Bacteria" Cavalier-Smith 2002"Bacteriaceae" Cohn 1872a"Bacteriobionta" Möhn 1984"Bacteriophyta" Schussnig 1925"Eubacteria" Woese and Fox 1977"Neobacteria" Möhn 1984"Schizomycetaceae" de Toni and Trevisan 1889"Schizomycetes" Nägeli 1857Bacteria are ubiquitous, mostly free-living organisms often consisting of one biological cell.
MicroorganismMicroscopic living organismA cluster of Escherichia coli bacteria magnified 10,000 timesA microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from antiquity, with an early attestation in Jain literature authored in 6th-century BC India.
HelicobacterHelicobacter is a genus of gram-negative bacteria possessing a characteristic helical shape. They were initially considered to be members of the genus Campylobacter, but in 1989, Goodwin et al. published sufficient reasons to justify the new genus name Helicobacter. The genus Helicobacter contains about 35 species. Some species have been found living in the lining of the upper gastrointestinal tract, as well as the liver of mammals and some birds.
Helicobacter pyloriSpecies of bacteriaHelicobacter pylori, previously known as Campylobacter pylori, is a gram-negative bacterium best known for its role in infecting the human stomach, often causing gastric ulcers and sometimes stomach cancer. Its helical body (from which the genus name Helicobacter derives) is thought to have evolved to penetrate the mucous lining of the stomach, helped by its flagella, and thereby establish infection.
Staphylococcus aureusStaphylococcus aureus is a gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often positive for catalase and nitrate reduction and is a facultative anaerobe, meaning that it can grow without oxygen.
SpirochaeteA spirochaete () orspirochete is a member of the phylumSpirochaetota (also called Spirochaetes), which contains distinctive diderm (double-membrane) Gram-negative bacteria, most of which have long, helically coiled (corkscrew-shaped or spiraled, hence the name) cells.
Sarcina (bacterium)Sarcina is a genus of gram-positivecoccibacteria in the family Clostridiaceae. A synthesizer of microbial cellulose, various members of the genus are human flora and may be found in the skin and large intestine. The genus takes its name from the Latin word "sarcina," meaning pack or bundle, after the cuboidal (2x2x2) cellular associations they form during division along three planes.
SpirillumSpirillum is a genus of Gram-negative bacteria in the family Spirillaceae of the Nitrosomonadales of the Betaproteobacteria. There are two species of Spirillum with validly or effectively published names - Spirillum winogradskyi and Spirillum volutans.
ArchaeaDomain of organismsExcluded(but cladistically included)EukaryotaSynonyms"Archaebacteria" Woese & Fox 1977"Archaeobacteria" Murray 1988"Mendocutes" Gibbons & Murray 1978"Mendosicutes" Murray 1984"Metabacteria" Hori and Osawa 1979"Neomura" Cavalier-Smith 2002"Archaebiota" Luketa 2012"Arkarya" Forterre 2015Archaea ( ) is a domain of organisms.
HaloquadratumHaloquadratum (common abbreviation: Hqr.) is a genus of archaean, belonging to the family Haloferacaceae. The first species to be identified in this group, Haloquadratum walsbyi, is unusual in that its cells are shaped like square, flat boxes. This halophilic archaean, discovered in 1980 by A.E. Walsby in the Gavish Sabkha, a coastal hypersaline pool (sabkha) on the Sinai Peninsula in Egypt, was not cultured until 2004.
StaphylococcusStaphylococcus, from Ancient Greek σταφυλή (staphulḗ), meaning "bunch of grapes", and κόκκος (kókkos), meaning "kernel" or "Kermes", is a genus of Gram-positive bacteria in the family Staphylococcaceae from the order Bacillales. Under the microscope, they appear spherical (cocci), and form in grape-like clusters. Staphylococcus species are facultative anaerobic organisms (capable of growth both aerobically and anaerobically).
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