| impact of fumigants on soil microbial communities. | agricultural soils are typically fumigated to provide effective control of nematodes, soilborne pathogens, and weeds in preparation for planting of high-value cash crops. the ability of soil microbial communities to recover after treatment with fumigants was examined using culture-dependent (biolog) and culture-independent (phospholipid fatty acid [plfa] analysis and denaturing gradient gel electrophoresis [dgge] of 16s ribosomal dna [rdna] fragments amplified directly from soil dna) approaches. ... | 2001 | 11425748 |
| characterization of novel bacteriochlorophyll-a-containing red filaments from alkaline hot springs in yellowstone national park. | novel red, filamentous, gliding bacteria formed deep red layers in several alkaline hot springs in yellowstone national park. filaments contained densely layered intracellular membranes and bacteriochlorophyll a. the in vivo absorption spectrum of the red layer filaments was distinct from other phototrophs, with unusual bacteriochlorophyll a signature peaks in the near-infrared (ir) region (807 nm and 911 nm). these absorption peaks were similar to the wavelengths penetrating to the red layer of ... | 2000 | 11041345 |
| heliothrix oregonensis, gen. nov., sp. nov., a phototrophic filamentous gliding bacterium containing bacteriochlorophyll a. | an unusual filamentous, gliding bacterium was found in a few hot springs in oregon where it formed a nearly unispecific top layer of microbial mats. it contained a bacteriochlorophyll a-like pigment and an abundance of carotenoids. there were no chlorosomes or additional chlorophylls. the organism was aerotolerant and appeared to be photoheterotrophic. it was successfully co-cultured with an aerobic chemoheterotroph in a medium containing glucose and casamino acids. although it has many characte ... | 1985 | 2412519 |
| uncultivated cyanobacteria, chloroflexus-like inhabitants, and spirochete-like inhabitants of a hot spring microbial mat. | analysis of 16s rrna sequences retrieved as cdna (16s rcdna) from the octopus spring cyanobacterial mat has permitted phylogenetic characterization of some uncultivated community members, expanding our knowledge or diversity within this microbial community. two new cyanobacterial 16s rrna sequences were discovered, raising to four the number of cyanobacterial sequence types known to occur in the mat. none of the sequences found is that of the cultivated thermophilic cyanobacterium synechococcus ... | 1992 | 1282313 |