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4 recordsLinked to original sources
PubMed1989

Nucleotide sequence of 16S rRNA and phylogenetic position of the green sulfur bacterium Clathrochloris sulfurica.

The almost complete primary structure of the 16S rRNA from the green sulfur bacterium "Clathrochloris sulfurica" was determined by reverse transcriptase sequencing. Comparison of defined invariable parts of the molecule from representatives of 9 major lines of descent from the eubacterial kingdom shows C. sulfurica to be highly related to Chlorobium vibrioforme. The relationship between "Clathrochloris" and Chlorobium is in accord with the present allocation of these two genera into the family Chlorobiaceae.

Base Sequence↗
PubMed1975

A morphological study of anaerobic bacteria from the hypolimnia of two Michigan lakes.

Dense populations of anaerobic bacteria were found sequentially layered below the thermocline in two eutrophic lakes in southwest Michigan. Phase and electron microscopy of whole cells and thin sections were used to reveal the in situ morphology of the dominant members of the community. The predominant chlorophyll-containing bacteria were identified on the basis of their morphology to be members of the genera Pelodictyon, Prosthecochloris, Clathrochloris, Chlorochromatium, Pelochromatium, Thiopedia, Thiocystis, Thiospirillum, and Chromatium. The natural morphology of these organisms is described and compared with the morphology of reported isolates, the morphology of unisolated genera was compared with previous descriptions of natural samples. Most of the organisms near the sediment-water interface and two from the upper hypolimnion have not been previously described. They have been divided into six distinct groups based on morphology; the morphological features of each group are presented. This approach, based on the morphological uniqueness of the procaryotes present, provides a satisfactory method for grouping members of the hypolimnetic community for ecological studies.

Anaerobiosis↗
PubMed1975

The structure of anaerobic bacterial communities in the hypolimnia of several Michigan lakes.

The structure of bacterial communities, the distribution of sulfide and oxygen, bacteriochlorophyll concentrations, and the temperature profile were determined for the anaerobic hypolimnia of two lakes in southern Michigan. Information from these studies, plus qualitative observations of two other lakes and two ponds over a 4-year period were used to correlate the spatial distribution of the populations, cell size, arrangement of photosynthetic vesicles or lamellae, presence of gas vacuoles or flagella, sulfur deposition, and environmental factors. On the basis of these results, three communities designated as A, B, and C were defined. The upper (A) community consisted of sequentially layered purple sulfur bacteria including two or more of the following genera: Thiopedia, Thiospirillum, Thiocystis, or Chromatium. The middle (B) community consisted of sequential layers of green bacteria from one or more of the following genera: Pelodictyon, Clathrochloris, Chlorochromatium, or Prosthecochloris. The lowest (C)community contained previously unreported gas-vacuolate colorless bacteria 0 to 0.7 m above the sediment. Microstratification (0.1- to 0.2-m layers) of populations was observed within the A and B communities.

Anaerobiosis↗