Environmental applications for biosurfactants

/pdf/an-introduction-to-the-aquatic-insects-of-north-america-20i7stzjkw.pdf

An Introduction to the Aquatic Insects of North America

Recent development in the treatment of oily sludge from petroleum industry: A review

Aquaculture practices and potential human health risks: Current knowledge and future priorities

Bioremediation, involving bioaugmentation and/or biostimulation, being an economical and eco-friendly approach, has emerged as the most advantageous soil and water clean-up technique for contaminated sites containing heavy metals and/or organic pollutants. Addition of pre-grown microbial cultures to enhance the degradation of unwanted compounds (bioaugmentation) and/or injection of nutrients and other supplementary components to the native microbial population to induce propagation at a hastened rate (biostimulation), are the most common approaches for in situ bioremediation of accidental spills and chronically contaminated sites worldwide. However, many factors like strain selection, microbial ecology, type of contaminant, environmental constraints, as well as procedures of culture introduction, may lead to their failure. These drawbacks, along with fragmented literature, have opened a gap between laboratory trials and on-field application. The present review discusses the effectiveness as well as the limitations of bioaugmentation and biostimulation processes. A summary of experimental studies both in confined systems under controlled conditions and of real case studies in the field is presented. A comparative account between the two techniques and also the current scenario worldwide for in situ biotreatment using bioaugmentation and biostimulation, are addressed.

Bioaugmentation and biostimulation strategies to improve the effectiveness of bioremediation processes.

https://research.tees.ac.uk/ws/files/6478030/58336.pdf

Bioremediation of gasoline contaminated soil by a bacterial consortium amended with poultry litter, coir pith and rhamnolipid biosurfactant.

The incidence of Aeromonas hydrophila in freshly caught finfish and prawns from four major commercial fish landing sites of coastal South India was studied for a period of one year. Among 514 analysed samples of seafood (410 finfish and 104 prawn), 37% of them (37.3% of finfish and 35.6% of prawn) were contaminated with A. hydrophila. A total of 255 strains of A. hydrophila were isolated. Of the total isolates, about 78.4% of them were producers of haemolysin. All strains were resistant to bacitracin and all were sensitive to chloramphenicol. The results indicate that the strains originated from high-risk sources. The presence of A. hydrophila is an indication of marine contamination. The increasing presence of haemolysin-producing multiple drug-resistant A. hydrophila in fish and prawn may become a potential human health hazard.

Incidence of haemolysin-positive and drug-resistant Aeromonas hydrophila in freshly caught finfish and prawn collected from major commercial fishes of coastal South India

The present investigation encompasses antibacterial potential of three medicinal plants used by the tribals of Nilgiris for the treatment of various skin ailments. About 18 extracts at three concentrations (10, 5, 2.5 mg/ml) of different plant parts of Siegesbeckia orientalis Linn., Berberis tinctoria Lesch. and Justicia betonica Linn. were tested against pathogenic bacteria, viz. Aeromonas hydrophila, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi, Salmonella sp., Staphylococcus aureus, Vibrio cholerae and V. parahemolyticus. All the extracts exhibited broader antibacterial activity against the tested pathogens.

http://nopr.niscair.res.in/bitstream/123456789/7842/1/NPR%206%281%29%2034-39.pdf

Antibacterial activity of some ethnomedicinal plants from the Nilgiris, Tamil Nadu, India

Chironomid larvae that inhabit in aquatic sediments play an important role as vector for bacterial pathogens. Its life cycle consists of four stages i.e. eggs, larvae, pupae and adult. In the present study we identified bacterial species associated with whole larvae of chironomids from 11 lake sediments of Bangalore region using 16s rRNA gene Sanger sequencing. We found that larvae from all lake sediments associated with bacterial species which include key pathogens. Totally we identified 65 bacterial isolates and obtained GenBank accession numbers (KX980423 - KX980487). Phylogenetic tree constructed using MEGA 7 software and tree analysis highlight the predominant bacterial community associated with larvae which include Enterobacteriaceae (43.08%; 28 isolates) and Aeromonas (24.62%; 16 isolates), Shewanella, Delftia, Bacillus (6.15%; 4 isolates each), Pseudomonas (4.62%; 3 isolates) and Exiguobacterium (3.08%; 2 isolates). Current findings state that among bacterial population Aeromonas, Enterobacter and Escherichia with serotypes are commonly associated with larvae in maximum lake points. In other hand Vibrio, Pseudomonas, Klebsiella, Shigella, Bacillus, and other bacterial species were identified moderately in all lakes. Interestingly, we identified first time Shigella Gram negative, rod shaped pathogenic organism of Enterobacteriaceae and Rheinheimera Gram negative, rod shaped organism associating chironomid larvae.

Tha. Thayumanavan

Papers

Bioremediation of gasoline contaminated soil by a bacterial consortium amended with poultry litter, coir pith and rhamnolipid biosurfactant.

Incidence of haemolysin-positive and drug-resistant Aeromonas hydrophila in freshly caught finfish and prawn collected from major commercial fishes of coastal South India

Antibacterial activity of some ethnomedicinal plants from the Nilgiris, Tamil Nadu, India

Bacterial fauna associating with chironomid larvae from lakes of Bengaluru city, India - A 16s rRNA gene based identification

Typing of haemolytic and antibiotic resistant Aeromonas hydrophila isolated from raw milk of Coimbatore, South India.