Bacterial growth on distant naphthalene diffusing through water, air, and water-saturated and nonsaturated porous media

Article Abstract:

The growth of the naphthalene-degrading bacterial strain HH4 depends on naphthalene diffusion through water, air or porous media. The growth is inversely related to the distance between the bacteria and the naphthalene substrate. Bacterial growth and final naphthalene degradation rate are higher if naphthalene diffuses through air or unsaturated porous media, as naphthalene diffuses through air faster than through water. A mathematical model combining Monod growth kinetics and substrate diffusion explains the bacterial growth.

Models, Analysis, Physiological aspects, Biodegradation, Bacterial growth, Naphthalene, Diffusion, Diffusion (Physics)

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Grazing of a Tetrahymena sp. on adhered bacteria in percolated columns monitored by in situ hybridization with fluorescent oligonucleotide probes

Article Abstract:

Research was conducted to investigate the predation of attached Pseudomonas putida mt2 by the small ciliate Tetrahymena sp. under lotic and lentic conditions. Data were compared to grazing rates in batch systems containing suspended prey with densities of 2 x 10(super 8) bacteria per ml of pore space and 2 x10(super 8) bacteria per ml of suspension. Results indicate that the correlation between the retardation of transport and grazing activity is caused by the interaction between attached bacteria and active predators.

Research, Usage, Bacteria, In situ hybridization, Nucleic acid probes, Bacterial adhesion, Pseudomonas putida, Ciliata, Ciliates

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Evidence for geographic isolation and signs of endemism within a protistan morphospecies

Article Abstract:

A total of 54 strains were analyzed for their phylogenetic relationship and maximum growth temperatures to critically test the temperature adaptation of a flagellate morphospecies. This shows that, protistan transport to Antarctica is sufficiently restricted to allow local protistan population to adapt to local environmental conditions and build up biogeographically restricted populations.

Antarctica, Environmental aspects, Protista, Protists

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