Vellar Estuary was investigated as a source of actinomycetes to screen for production of novel bioactive compounds. The presence of relatively large populations of Streptomyces in Vellar Estuary soil ...samples indicates that it is an eminently suitable ecosystem for actinomycetes. Actinomycetes counts ranged 12 x 10 super(4) cfu/g of soil. The actinomycetes isolated from these ecosystems are capable of producing antibiotics that strongly inhibit the growth of Gram positive and Gram-negative bacteria and yeast like fungi. Further cultural and physiological characterization and DNA homology suggest that strain DPTD-5 is identical to Streptomyces bikiniensis.
The taxonomic characteristics of weeds such as morphology of shoot, leaves, flowers, stem, fruits and seeds were recorded as Gynandropsis pentaphylla, DC, Amarantus spinosus Linn, Cyperus rotundus, ...Amarantus viridis Linn, Cassia occidentalis, Linn and Echinochilora orygicola. Totally 20 actinobacteria isolates were screened for herbicidal activity against the weed. Among the 20 isolates, only four actinobacterial isolates KA1-3, KA1-4, KA1-7 and KA23A showed significant herbicidal activity against C. rotundus. The herbicidal effect of actinobacterial culture filtrates on germination and seedling growth of C. rotundus was tested. The shoot and root growth of C. rotundus was severely affected when compared to control. The potent actinobacterial isolates KA1-4 and KA1-7 were characterised based on their morphological and molecular phylogenetic property and were identified as Streptomyces sp. The present study concludes that actinobacterial isolates will be used as bioherbicide against C. rotundus. Further studies are required to confirm the activity of actinobacterial isolates against C. rotundus under field conditions.
A fungicide is a chemical pesticide compound that kills or inhibits the growth of fungi. In agriculture, fungicide is used to control fungi that threaten to destroy or compromise crops. Fungicides ...for Plant and Animal Diseases is a book that has been written to present the most significant advances in disciplines related to fungicides. This book comprises of 14 chapters considering the application of fungicides in the control and management of fungal diseases, which will be very helpful to the undergraduate and postgraduate students, researchers, teachers of microbiology, biotechnology, agriculture and horticulture.
A total of 59 Lactobacillus isolates were isolated from 5 different fresh water fish such as Catfish (Clarias orientalis), Hari fish (Anguilla sp), Rohu fish (Labeo rohita), Jillabe fish (Oreochromis ...sp) and Gende fish (Punitus carnaticus). Among the 59 isolates only 4 Lactobacillus isolates were selected for further study. Based on morphological and biochemical characteristics, the isolates were identified as Lactobacillus sp. The pathogen were isolated from infected catfishes, characterized and identified as Vibrio parahaemolyticus, Aeromonas sp and Aeromonas salmonicida. The Lactobacillus isolates were screened for antagonistic activity against Aerornonas, Wibrio sp. by agar diffusion assay. Among the 4 isolates, Lactobacilli RLD2 showed significant antagonistic activity against Aeromonas and Vibrio sp alone, and was further evaluated by standard plate count assay for the viability of pathogen. The isolate was multiplied and the fish feed was supplement with Lactobacillus isolates. The results reveal that the size, weight of the fish was statically increased in comparison to that of control fish. The present study concluded that the Lactobacillus isolates could be used as probiotic bacteria in aquaculture, to manage aeromonasis.
Twenty six antibiotic producing Streptomyces were isolated from soils of Cuddalore Tamil Nadu, India and were evaluated for their ability to inhibit plant pathogenic Rhizoctonia solani in vitro. It ...was found that the isolates having pathogenic inhibitory ability and also controls Rhizoctonia solani damping off in tomato in interested field soils. The Streptomyces isolates tested significantly reduced damping off severity in tomato. A variation in their effect on plant disease severity, percentage dead plants and plant biomass in the presence of the pathogen, was observed among the isolates.
Probiotic effect of Lactobacillus isolates against bacterial pathogens in Clarias orientalis Dhanasekaran, D., Bharathidasan University, Tiruchirappalli (India). School of Life Sciences, Department of Microbiology; Saha, S; Thajuddin, N., Bharathidasan University, Tiruchirappalli (India). School of Life Sciences, Department of Microbiology ...
Facta universitatis. Series Medicine and biology,
(2008), Letnik:
15, Številka:
3
Journal Article
About 59 Lactobacillus isolates were isolated from 5 different fresh water sites such as Cat fish (Clarias orientalis), Hari fish (Anguilla sp), Rohu fish (Labeo rohita), Jillabe fish (Oreochromis ...sp) and Gende fish (Punitus carnaticus). Among the 59 isolates only 4 Lactobacillus isolates were selected for further study. Based on morphological, biochemical characteristics, the isolates were identified as Lactobacillus sp. The pathogens were isolated, characterized and identified as Vibrio parahaemolyticus, Aeromonas sp and Aeromonas salmonicida. The Lactobacillus isolates were screened for antagonistic activity against Aeromonas, Vibrio sp. by agar diffusion assay. Among the 4 isolates, Lactobacilli RLD2 showed significant antagonistic activity against Aeromonas and Vibrio sp alone. This isolate was further evaluated by standard plate count assay for the viability of pathogen. The isolate was multiplied and the fish feed was supplemented with Lactobacillus isolates. The results reveal that the size and weight of the fish statically increased in comparison to that of control fish. The present study concluded that the Lactobacillus isolates will be used as probiotic bacteria in aquaculture, to manage aeromonasis.
An antifungal compound: 4' phenyl-1-napthyl-phenyl acetamide from Streptomyces sp. DPTB16 Dhanasekaran, D., Bharathidasan University, Tiruchirappalli (India). School of Life Sciences, Department of Microbiology; Thajuddin, N., Bharathidasan University, Tiruchirappalli (India). School of Life Sciences, Department of Microbiology; Panneerselvam, A., A.V.V.M. Sri Pushpam College, Poondi (India). P.G. and Research Department of Botany and Microbiology
Facta universitatis. Series Medicine and biology,
(2008), Letnik:
15, Številka:
1
Journal Article
The identification of antifungal compound was made by determining the melting point, by means of elemental analysis and spectral analysis such as UV, IR, NMR and Mass spectra. Based on the spectral ...characteristics, the antifungal compound was identified as 4' phenyl-1-napthyl-phenyl acetamide from Streptomyces sp. DPTB16. It showed antifungal activity against Candida albicans followed by Aspergillus niger, A. fumigatus, A. flavus and minimum inhibitory activity was observed with Mucor sp. and Penicillium sp.
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