In order to examine the influence of discharge from different rivers from peninsular India and urban sewage on intensity and dissemination of heterotrophic, indicator and pathogenic bacteria, a study was carried out during peak discharge period along coastal Bay of Bengal. The coastal Bay received freshwater inputs from the river Ganges while Godavari and Krishna contributed to the south. Contr...

Our survey of cooling tower water demonstrated that the highest density of legionellae, >/=10 CFU/100 ml, appeared in water containing protozoa, >/=10 MPN/100 ml, and heterotrophic bacteria, >/=10 CFU/100 ml, at water temperatures between 25 and 35 degrees C. Viable counts of legionellae were detected even in the winter samples, and propagation, up to 10 CFU/100 ml, occurs in summer. The counts...

The study of interaction between fish cage culture and sediment population dynamics heterotrophic bacteria in the southern Caspian Sea (Nowshahr region)

A scheme has been proposed to identify the marine heterotrophic bacterial genera based on the minimum biochemical tests. Fifteen gram negative and six gram positive marine bacterial genera could be identified with this proposed scheme which involves staining, morphology, motility and some major biochemical tests INTRODUCTION A number of reports are available on key characters for the identifica...

Recirculating aquaculture systems may require an internal disinfection process to control population growth of pathogens and heterotrophic bacteria. Ozonation and ultraviolet (UV) irradiation are two technologies that have been used to treat relatively large aquaculture flows, including flows within freshwater systems that recirculate water. The objective of the present study was to evaluate th...

Cyanobacteria are the key primary producers in global ocean and account for 25% of its net productivity. They play a vital role by driving circulation matter flow energy via absorption considerable amounts carbon dioxide release dissolved organic matter. This is converted into biomass marine heterotrophs, which keeps cycling elements oligotrophic waters at equilibrium. Prochlorococcus, an ecolo...

A PCR approach was used to construct a database of nasA genes (called narB genes in cyanobacteria) and to detect the genetic potential for heterotrophic bacterial nitrate utilization in marine environments. A nasA-specific PCR primer set that could be used to selectively amplify the nasA gene from heterotrophic bacteria was designed. Using seawater DNA extracts obtained from microbial communiti...

Marine sponges play important roles in benthic environments and are sensitive to environmental stresses. Polybrominated diphenyl ethers (PBDEs) have been widely used as flame retardants since the 1970s and are cytotoxic and genotoxic to organisms. In the present study, we studied the short-period effect of PBDE-47 (2,2',4,4'-tetrabromodiphenyl ether) treatment on the community structure and fun...

The role of potential factors limiting bacterial growth was investigated along vertical and longitudinal gradients across the South Eastern Pacific Gyre. The effects of glucose, nitrate, ammonium and phosphate additions on heterotrophic bacterial production (using leucine technique) were studied in parallel in unfiltered seawater samples incubated under natural daily irradiance. The enrichments...

Heterotrophic bacteria are significant components of prokaryotic communities in marine ecosystems (AzAm & HodSoN, 1977). methods developed in last few decades for studying microorganisms, including optical, radioactive marking methods and molecular techniques, have shown that many of the methods previously used actually ignored A one-year survey of HNA and LNA heterotrophic bacteria abundance a...