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A polar organelle is a structure at a specialised region of the bacterial polar membrane that is associated with the flagellar apparatus. [ 1 ] [ 2 ] This flagellum-associated structure can easily be distinguished from the other membrane regions in ultrathin sections of embedded bacteria by electron microscopy when the cell membrane is ...
A flagellum (/ f l ə ˈ dʒ ɛ l əm /; pl.: flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores (), and from a wide range of microorganisms to provide motility.
Polarella inhabits channels within ice formations in both the Arctic and Antarctic polar regions, [3] where it plays an important role as a primary producer. [4] Polarella is a thecate dinoflagellate, wherein the cell has an outer covering of cellulose plates, which are arranged in nine latitudinal series. [ 1 ]
Bradyrhizobium species are Gram-negative bacilli (rod-shaped) with a single subpolar or polar flagellum.They are common soil-dwelling micro-organisms that can form symbiotic relationships with leguminous plant species where they fix nitrogen in exchange for carbohydrates from the plant.
All members can produce endospores are most are motile by means of a single polar flagellum or peritrichous flagella. Colonies are generally light-yellow in colour. Most species are catalase-positive and oxidase-negative. Rossellomorea can grow in temperatures ranging from 5 °C to 48 °C and generally also in the presence of 2–5% (w/v) NaCl ...
Magnetospirillum is a Gram-negative, microaerophilic genus of magnetotactic bacteria, first isolated from pond water by the microbiologist R. P. Blakemore in 1975. [2] [3] They have a spiral (helical) shape and are propelled by a polar flagellum at each end of their cells.
In solutions with NaCl concentrations of 0.6-1.5M, Marinobacter hydrocarbonoclasticus produce and move by the movement of “a single unsheathed polar flagellum.” [2] In solutions with NaCl concentrations <0.2 or >1.5, M. hydrocarbonoclasticus are unable to produce flagella, and are thereby unable to influence their movement through medium. [2]
Polar flagella, enabling motility Many members produce derivatives of the fluorescent pigment pyoverdin [ 6 ] The presence of oxidase and polar flagella and inability to carry out fermentation differentiate pseudomonads from the Enterobacteriaceae .