Spiral bacteria

The individuals in the colony, depending upon the kind of bacteria under examination, may be globular, rod-shaped, or spiral. Bacteria are classed according to form into the following families and genera. 

Darwin, P.E., Sztein, M.B., Zheng, Q.X., James, S.P., Fantry, G.T. (1996) Immune evasion by Helicobacter pylori, gastric spiral bacteria lack surface immunoglobulin deposition and reactivity with homologous antibodies. Helicobacter 1, 20-27. 

Ba.cteria., A wide variety of bacteria can colonize cooling systems. Spherical, rod-shaped, spiral, and filamentous forms are common. Some produce spores to survive adverse environmental conditions such as dry periods or high temperatures. Both aerobic bacteria (which thrive in oxygenated waters) and anaerobic bacteria (which are inhibited or killed by oxygen) can be found in cooling systems. 

At pH 4 most bacteria are killed within 30 min, and at physiological luminal pH, 99% of bacteria are killed within 5 min [14], Certain bacteria, like lactobacilli, are more acid-resistant, and some microbes survive the hostile gastric environment by colonizing luminal niches at the mucosal surface, protected by gastric bicarbonate secretion. This is the case for Helicobacter pylori, related spiral-... 

Bacteria Unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three prindpal forms round or coccal, rodlike or badllary, and spiral or spirochetal. [NIH]... 

Sulfur bacteria cells spherical, short or long straight rods, short spirals or filaments cells contain sulfur granules,... 

Aerobic spiral and curved motile gram-negative bacteria. Bdellovibrio, Campylobacter (C. jejuni, diarrhea), Helicobacter (H. pylori, gastric ulcers), Spirillum... 

A third group of bacteria are the curved or bent rods. Of these, the genus Vibrio is composed of bacteria that arc comma-shaped and die genus Spirillum consists of those that are twisted and spiral in form. All members... 

Figure 5. The double-spiral longitudinal vortex. A longitudinal vortex showing the development of toroidal countervortices. These occur on interaction with the pipe walls and have an effect similar to ball bearings, enhancing the forward movement. Their interior rotation follows the direction of rotation and forward motion of the central vortex, whereas the direction of their exterior rotation and translatory motion are reversed. These toroidal vortices act to transfer oxygen, bacteria, and other impurities to the periphery of the pipe, where, because of the accumulation of excessive oxygen, the inferior, pathogenic bacteria are destroyed and the water rendered bacteria-free.

In some applications of reverse osmosis and ultrafiltration spiral-wound modules in the food industry, it may be desirable to allow a small portion of the feed solution to bypass the module to prevent bacteria growing in the otherwise stagnant fluid. One way of achieve this bypass is by perforating the ATD as illustrated in Figure 3.45 [115]. 

Bacteria come in three shapes spherical (coccus), rod-shaped (baciUus), and spiral-shaped (vibrio, spirillum, and spirochete). A vibrio is a spiral organism shaped like a coma. A spirillum is also a spiral organism whose long axis remains rigid when in motion the spirochete is also yet another spiral organism whose long axis bends when in motion. 

Purple sulfur bacteria Amoebobacter Chromatium Ectothiorhodospira Lamprocystis Thiocapsa Thiocystis Thiodictyon Thiopedia Thiospirillum Unicellular rods, spheres, spirals... 

---