Spirochete

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spirochete

[′spī·rə‚kēt]
(microbiology)
The common name for any member of the order Spirochaetales.

Spirochete

 

a bacterium, measuring 0.1–0.6 micrometer in diameter and 5–500 micrometers in length, in the form of an elongated coiled spiral. The majority of species have a slender axis filament around which the body of the cell is spirally coiled. Spirochetes lack flagella and are characterized by undulating movements, during which the cells rotate around their long axis. Reproduction is by transverse fission.

Spirochetes may be nonpathogenic or pathogenic. The former inhabit freshwaters, and the latter parasitize mollusks and cause syphilis in man (Treponema pallidum), relapsing fever (Borrelia recurrentis), and other spirochetoses. Under artificial conditions, nonpathogenic spirochetes grow on ordinary nutrient mediums and pathogenic spirochetes grow on mediums that contain serum and pieces of fresh tissue or the internal organs of animals. Some forms have not yet been grown in the laboratory.

References in periodicals archive ?
Numerous viable spirochaetes were observed under the dark field microscope (Fig.
Silver Deposition Techniques: The standard stains for spirochaetes have long been silver deposition methods.
Gupta R, Mahmood S, Adeolu M (2013) A phylogenomic and molecular signature based approach for characterization of the phylum Spirochaetes and its major clades: proposal for a taxonomic revision of the phylum.
The Bacteroidetes Spirochaetes Tenericutes (Mollicutes) Acidobacteria Fibrobacteres Fusobacteria Dictyoglomi Gemmatimonadetes Lentisphaerae Verrucomicrobia Chlamydiae and Planctomycetes.
spirochaetes prevotella veillonella bacteroides and capnocytophaga in the gingival crevice of partially impacted third molars.
Se multiplica solo en el cuerpo humano, sin prosperar por lo tanto en cultivos artificiales y se clasifica ahora en el filo Spirochaetes, clase Spirochaetia, orden Spirochaetales y familia Spirochaetaceae (5).
Gingivalis and spirochaetes, protease activity alters the mucosal epithelium to increase the adhesion and colonization of respiratory pathogens.
Leptospira are spirochaetes, Gram-negative bacteria which is a causal agent for this disease.
Only in Idas 5 was a reduced signal identified in the dorsal part where male acini occur that appeared to be spirochaetes (Fig.
In lysimeter samples, a few sequences were assigned to TM7, Spirochaetes, Verrucomicrobia, and Chlamydiae phyla.
Differentiation of intestinal spirochaetes by multilocus enzyme electrophoresis analysis and 16S rRNA sequence comparisons.
El genero Leptospira corresponde a un grupo de bacterias del phyllum Spirochaetes, que se caracteriza por estar formado por bacterias aerobias o microaerofilicas, similares a las Gram negativas debido a que su pared celular esta formada por una membrana celular externa, la cual rodea la capa de peptidoglicano (1, 2).