Temperature dependence of inorganic nitrogen uptake: reduced affinity for nitrate at suboptimal temperatures in both algae and bacteria

Article Abstract:

Nitrate utilization and ammonium utilization were studied by using algal and bacterial isolates, and a range of temperatures in chemostat and batch cultures. At suboptimal temperatures, the residual concentrations of nitrate in batch cultures and the steady-state concentrations of nitrate in chemostat cultures both increased. The steady state concentrations of ammonium remained relatively constant over the same temperature range. Low temperature has a consistent effect on the affinity for nitrate of psychrophilic, mesophilic and thermophilic bacteria and algae.

Research, Algae, Food and nutrition, Plants, Bacteria, Nitrates, Plant nutrition

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Diversity and abundance of nitrate reductase genes (narG and napA), nitrite reductase genes (nirS and nrfA), and their transcripts in estuarine sediments

Article Abstract:

The study explains the diversity and abundance of various nitrate reductase genes (narG and napA), nitrite reductase genes (nirS and nrfA) and their transcripts in estuarine sediments. The results show that the transcript numbers for most of the phylotypes quantified are greatest at the estuary head.

Biological diversity, Biodiversity

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Diatom-derived carbohydrates as factors affecting bacterial community composition in estuarine sediments

Article Abstract:

The effects of different available carbon sources on the particular bacterial taxa are examined. Results conclude that diatom-derived extracellular carbohydrates degraded due to the participation of taxon and substrate-specific responses inside the bacterial community.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Carbohydrates, Environmental aspects

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