| morphology and ultrastructure of crenothrix polyspora cohn. | naturally grown cell material of crenothrix polyspora from the well of a waterworks was studied by means of phase-contrast and nomarski interference microscopy as well as by transmission electron microscopy. the material consisted of clusters of sheathed filaments up to 2 cm long. propagation forms observed were nonmotile, spherical cells that arose by simple ("macrogonidia") or multiple ("microgonidia") septation of the filamental tips. ultrastructural analysis revealed crenothrix to be procary ... | 1977 | 873887 |
| spatial distribution of microorganisms and measurements of oxygen uptake rate and ammonia uptake rate activity in a drinking water biofilter. | the biofilm characteristics (population dynamics and biofilm composition) in a biological filter for the removal of iron, manganese and ammonium were studied in a drinking water treatment plant. the objective was to examine the spatial distribution and biological composition of active biomass that grows in a biological filter and to verify the effect of the backwashing on the quantity of fixed biomass and on the density and activity of the biological population. heterotrophic microorganisms acti ... | 2001 | 11329808 |
| cohn's crenothrix is a filamentous methane oxidizer with an unusual methane monooxygenase. | 135 years ago ferdinand cohn, the founder of bacteriology, microscopically observed a conspicuous filamentous bacterium with a complex life cycle and described it as crenothrix polyspora. this uncultured bacterium is infamous for mass developments in drinking water systems, but its phylogeny and physiology remained unknown. we show that c. polyspora is a gammaproteobacterium closely related to methanotrophs and capable of oxidizing methane. we discovered that c. polyspora encodes a phylogenetica ... | 2006 | 16452171 |
| clonothrix fusca roze 1896, a filamentous, sheathed, methanotrophic gamma-proteobacterium. | crenothrix polyspora cohn 1870 and clonothrix fusca roze 1896 are two filamentous, sheathed microorganisms exhibiting complex morphological differentiation, whose phylogeny and physiology have been obscure for a long time due to the inability to cultivate them. very recently, dna sequencing data from uncultured c. polyspora-enriched material have suggested that crenothrix is a methane-oxidizing gamma-proteobacterium (39). in contrast, the possible ecological function of c. fusca, originally cons ... | 2007 | 17416684 |