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- W4241837564 abstract "Leu' co.thrix . Gr. adj. leucus clear, light; Gr. n. thrix, trichis hair; M.L. fem. n. Leucothrix colorless hair. Proteobacteria / Gammaproteobacteria / Thiotrichales / Thiotrichaceae / Leucothrix Long filaments composed of short, cylindrical or ovoid cells (gonidia) , cross‐walls clearly visible, colorless, unbranched ; typically uniform filaments may taper from base to apex, showing under some conditions an apical beady chain of gonidia connected from end to end. Filaments may attain a length of over 100 µm, and lengths of several hundred micrometers are not unusual (Harold and Stanier, 1955; Pringsheim, 1957). The filaments, particularly when attached to a substrate, may be somewhat tapered, with the apex being 2–3 µm and the base 5–6 µm in diameter (Harold and Stanier, 1955; Pringsheim, 1957; Brock, 1969). In nature, filaments are usually attached to solid substrates by means of inconspicuous holdfasts; stalks and sheaths absent. Filaments do not glide , but may wave sporadically from side to side. Dispersal by means of gonidia (single cells arising from cells of the filaments by rounding up, often released primarily from apices, but they may also be formed in an intercalary fashion); gonidia often , but not always, show jerky gliding motion on solid substrates. Rosette formation is a key diagnostic characteristic of the genus that is seen frequently in laboratory culture but less commonly in nature. The rosettes may be formed of gonidia or, after gonidial growth, of several or more filaments attached at their bases. Filaments in a laboratory culture often form true knots. These structures also occur in nature, but rarely. The organism morphologically resembles some filamentous cyanobacteria but does not form photosynthetic pigments. Gram negative. Strictly aerobic, heterotrophic. Aquatic; typically marine , although one freshwater strain has been reported. Strains require NaCl for growth; optimum concentration: about 1.5% NaCl; grows at concentrations of 0.3–6.0% NaCl. Most strains do not require growth factors. Optimum temperature: 25°C; maximum: 30–35°C; minimum: 0°C, forming visible colonies within 1–2 weeks. Strains from tropical waters are more stenothermal, not growing below 15°C. Catalase positive. Oxidase positive. The mol % G + C of the DNA is : 46.9–51 (Brock and Mandel, 1966; Kelly and Brock, 1969a, b). Type species : Leucothrix mucor Oersted 1844, 44." @default.
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- W4241837564 date "2015-09-14" @default.
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- W4241837564 title "<i>Leucothrix</i>" @default.
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