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Articles by P. Mayavu
Total Records ( 4 ) for P. Mayavu
  The effect of amylase on growth performance, survival rate and proximate composition of Perinereis cultrifera was investigated. The amylase produced by Bacillus sp. was added to polychaete basal diets at three concentrations such as 50, 100 and 150 mg kg−1 in experiments I, II and III, respectively. After 90 days, polychaete receiving the diets supplemented with enzymes at 150 mg kg−1 showed significantly better growth performance and survival rate than those fed the basal diet (Control). Among these experimental animals, the maximum protein, lipid, carbohydrate and ash contents were recorded in experiment III, whereas moisture content was maximum in control and minimum in experiment III. The essential fatty acids such as palmitic acid (C16:0), margaric acid (C17:0), stearic acid (C18:0) and arachidonic acid (C20:4ω-6) occurred at higher concentration in experiment group than in control. Thus, the amylase produced by Bacillus sp. significantly influenced growth, survival rate and proximate composition of P. cultrifera which has importance in aquaculture industry.
  S. Sugesh and P. Mayavu
  The marine invertebrates become one of hot spot for the lead of antimicrobial compounds. Two species of commercially available and edible bivalves (M. meretrix and M. casta) were assayed for antimicrobial activity against 10 bacterial pathogens and 6 fungal pathogens and its biochemical composition. The bivalves were extracted with three different solvent systems respectively methanol, ethanol and acetic acid. All the three extracts of both the species M. meretrix and M. casta showed highest antibacterial activities against S. aureus, E. coli, B. substillus, K. pneumonia, P. fleuroscence and V. cholera. In present investigation the methanolic extract of the two bivalve species of M. meretrix and M. casta was showed inhibition activities against all pathogenic fungal forms. The two bivalve extracts showed high amounts of protein content, which made the variation up to 160-180 μg mg-1 (wet weight). Both samples had low amount of carbohydrates 4.77-5.77 μg mg-1 and lipids 0.11-0.17 μg mg-1, respectively. The results of thin layer chromatography were revealed that presence of pink color spots it clearly indicates the presence of amino acid or peptides in bivalve’s samples. Presuming that the antimicrobial compounds were proteins or peptides. In SDS-PAGE on 12% gel, the crude proteins M. meretrix and M. casta showed 5-6 bands ranging from 45-223 kDa. They represent potential pharmacological leads perhaps possessing novel and uncharacterized mechanisms of action that might ultimately benefit the ongoing global search for clinically useful antimicrobial agents.
  P. Mayavu , S. Sugesh and V.J. Ravindran
  The present study was carried out on antimicrobial properties of seagrass species against biofilm forming bacteria’s from boat hull during the period April 2008 to March 2009. Seagrass species have a very potential groups were producing several secondary metabolites. The bioactive potential of two different seagrass species viz., Cymodocea serrulata and Syringodium isoetifolium occurring commonly along the Tuticorin coastal area were selected and preliminary effort has been made against the marine biofilm forming bacteria’s Pseudomonas aeruginosa, Bacillus cereus, Proteus vulgaris, P. mirabilis, E. coli, Listeria monocytogenes, Salmonella enteritidis, Staphylococus aureus and Vibrio paraheamolyticus, which also the human pathogens. The seagrasses of C. serrulata and S. isoetifolium were extracted with four different solvents such as ethanol, methanol, acetone and dichloroethane. Ethanol and methanol extracts of S. isoetifolium was inhibited the biofilm forming bacteria such as E. coli (14 mm), P. aeruginosa (8 mm) and V. paraheamolyticus (7 mm) and it showing Minimum activity against S. aureus (2 mm). The crude extract of ethanol and methanol of C. serrulata was inhibited the growth of all the 9 species of the biofilm forming microbes. The results of present study were concluded that seagrasses have potential bioactivity against marine biofilm forming microorganisms.
  S. Ashokkumar , G. Rajaram , P. Manivasagan , S. Ramesh , P. Sampathkumar and P. Mayavu
  The present study was carried out to investigate the hydrographical parameters, nutrients, total coliforms and total heterotrophic bacteria populations in water and sediment samples of Mullipallam creek in Muthupettai mangroves. The range of hydrographical parameters in water samples viz., atmospheric temperature (28.5-32.2°C), surface water temperature (28.2-31.7°C), salinity (31-34‰), pH (8.0-8.3) and dissolved oxygen (2.95-3.52 mg-1) and in nutrients, inorganic phosphate (0.322-0.810 μmol-1), total phosphorus (1.312-3.239 μmol-1), nitrite (0.858 to 1.384 μmol-1), nitrate (1.937-5.133 μmol-1), silicate (16.272-21.237 μmol-1), ammonia (0.068-0.191 μmol-1) and total nitrogen (23.921-26.919 μmol-1) in water samples. The level of nutrients in the sediment samples, total nitrogen was varied from 3.70 to 8.96 μg-g, total phosphorus was ranged from 0.947 to 2.872 μg-g and total organic carbon was varied between 3.721 and 6.576 mg-g. The microbial population of present investigation was revealed that a total of nine bacterial coliforms were recorded, which includes of seven gram-negative forms such as Vibrio cholerae, V. parahaemolyticus, Escherichia coil, Klebsiella pneumonae, Shigella dysenteri, Streptococcus faecalis and Pseudomonas aeruginosa. The total of seven heterotrophic bacterial populations were recorded of which Vibrio sp. and Escherichia coli were from to be the dominant species followed by Shigella sp., Pseudomonas sp., Klebsiella sp., Salmonella sp. and Streptococcus sp.
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