Effects of nutrients on specific growth rate of bacterioplankton in oligotrophic lake water cultures

Article Abstract:

The influence of nutrient enrichment on the specific growth rates of bacterioplankton in oligotrophic lake water batch cultures was determined. The specific growth rates (SGRs) were calculated based on the changes in biovolumes and bacterial populations. Results showed that addition of inorganic phosphorus significantly increased SGRs while addition of organic carbon alone did not. This observation which is significant in the lake areas with high phosphatase activity implied a direct competition for inorganic phosphorus between bacterioplankton and phytoplankton.

Health aspects, Physiological aspects, Growth, Bacteria, Water, Carbon, Water chemistry, Microbial populations, Phosphorus, Phytoplankton

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Effect of substrate and cell surface hydrophobicity on phosphate utilization in bacteria

Article Abstract:

Analysis of the rate of utilization of hydrophobic and hydrophilic phosphates in gram-negative bacteria indicates that cell surface hydrophobicity and extracellular enzyme production influence the rate of phosphate utilization. Hydrophobic species use a membrane phospholipid and lipopolysaccharide. Phosphate utilization in bacteria with hydrophilic surfaces are affected by amphiphilic humic acids, while they do not affect hydrophobic bacteria.

Analysis, Gram-negative bacteria, Microbial metabolism, Metabolism, Phosphorus metabolism

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Isolation and characterization of a Mycobacterium species capable of degrading three- and four-ring aromatic and aliphatic hydrocarbons

Article Abstract:

Research was conducted to isolate and characterize a Mycobacterium species strain CH1 that can degrade three- and four-ring aromatic and aliphatic hydrocarbons including pyrene, fluoranthene and phenanthrene. CH1 was also observed to use branched alkanes and n-alkanes that are liquids at 25 degrees C and solid-phase alkanes as the sole carbon and energy source. Results indicate a distant relationship between genes involved in alkane oxidation.

Recombinant DNA, Mycobacterium, Polycyclic aromatic hydrocarbons, Ring formation (Chemistry), Cyclization (Chemistry)

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