Survival of fecal microorganisms in marine and freshwater sediments

Article Abstract:

A study conducted on the ability of fecal microorganisms to survive in freshwater and marine sediments found that fecal coliforms and streptococci were affected by the number of protozan predators present, while the number of Clostridium perfringens spores did not show any change. This could be possible because either the cyclohexamide used did not kill the predators of C. perfringens or it was ineffective in the sediment used. However, C. perfringens cells do not grow in the sediment since no vegetative cells were found. The exponential decay model could only be applied to fecal streptococci.

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Phylogenetic analysis of the bacterial communities in marine sediments

Article Abstract:

The phylogenetic composition of the bacterial community in coastal marine sediments was analyzed using a bead mill homogenizer and agarose gel electrophoresis. The technique allowed efficient cell lysis and recovery of high-molecular-weight DNA. Creosote-contaminated Eagle Harbor samples showed a DNA yield of 47 microgram/gm of dried sediment. Alpha, gamma, and delta Proteobacteria; gram-positive subdivisions with high G + C content; clostridia; and planctomyces and related organisms were found in the Eagle Harbor sample. Over 96% of the cells in the Puget Sound sample were lysed.

Research, Phylogeny

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Characterization of the sediment bacterial community in groundwater discharge zones of an alkaline fen: a seasonal study

Article Abstract:

The physical and chemical factors that influence the sediment bacterial community in groundwater upwelling zones in Cedar Bog are investigated. Cedar Bog is an alkaline fen located near Urbana, OH. The seasonal variations in bacteria activity, cell density and physiology and community structure were studied over a one year time period. The study gives new information regarding the role bacterial communities play in the regulation of nutrients and carbon flow in wetlands.

Analysis, Environmental aspects, Marine bacteria, Fens

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