Antibacterial Activities of Actinomycete Isolates Collected from Soils of Rajshahi, Bangladesh

Abstract

This study was performed to isolate actinomycete colonies having antibacterial activity from soil samples collected from different places around Rajshahi, Bangladesh. Thirty actinomycete colonies were isolated in pure culture from five soil samples using Starch-casein-nitrate-agar medium. The isolates were grouped in five color series based on their aerial mycelia color and screened for their antibacterial activity against a range of test bacteria. Sixteen isolates (53.3%) were found to have moderate to high activity against four gram-positive and four gram-negative bacteria. Since many isolates showed inhibitory activity against indicator bacteria, it is suggestive that Bangladeshi soil could be an interesting source to explore for antibacterial secondary metabolites.

Antibacterial Activity of Three Streptomyces Species Isolated From Soils of Shikaripura, Karnataka, India

“…Hence, isolation of new Streptomyces from natural resources and characterization of their secondary metabolites is valuable [10][11][12][13][14] . In the present study, we have isolated 32 actinomycetes from rhizosphere soils of Shikaripura by serial dilution followed by plating on SCN agar.…”

“…In the present study, we have isolated 32 actinomycetes from rhizosphere soils of Shikaripura by serial dilution followed by plating on SCN agar. SCN agar has been widely used for isolation of actinomycetes 6,[14][15][16][17][18][19] . The isolates were screened preliminary for antibacterial activity by Cross streak method.…”

Natural Products Solution against Superbugs: A Challenge of Biodiversity in a Public Health Issue

“…Among them the species with the highest production of secondary antimicrobial metabolites are streptomyces, bacillus, and myxococcus species [26]. Also microorganisms represent the largest source of natural products to date in where 45% are produced by actinomycetes, 38% by fungi and 17% by unicellular bacteria [29,30]. Evaluating the causes of the decrease in the isolation of new chemical entities Berdy 2.…”

Effect of Actinobacteria and Glomus fasiculatum against Fusarium oxysporum f. sp. lycopersici in Tomato Plant

“…lycopersici by cross steak method as per the protocols of Rahman et al, (2011). Actinobacterial isolates are streaked at the centre of SCBA media plates, and then plates are incubated at 28 o C for seven days after that fungal disc of 6 mm diameter is bored at 90 0 angles on both sides at defined length.…”

“…The antibacterial activity exhibited by actinobacteria may be due to the secretion of extracellular antimicrobial compounds. Antibiotics are known to be produced in the SCA media plates (Rahman et al, 2011).…”