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2.2. Primary Screening of Marine Actinomycetes for Antimicrobial Activity
The isolated marine actinomycetes were screened for their antimicrobial activity. The loopful of the growth from the slant was inoculated into 50 ml of seed medium; ASW-274(1) [glucose 15 g/L, corn steep liquor 5 g/L, sodium chloride 5 g/L, calcium carbonate 2 g/L, peptone 7.5 g/L, yeast extract 7.5 g/L, made in 75% ASW, pH
7.0 to 7.5] distributed in 250 ml Erlenmeyer flask and incubated for 96 h at 30˚C at 200 rpm on a rotary shakerdifferent production media used were as followed: ASW-SM12(1) [glucose 50 g/L, yeast extract 11 g/L, peptone 4 g/L beef extract 4 g/L, sodium chloride 2.5 g/L, calcium carbonate 5 g/L, made in 75% ASW, pH 7.4 -7.6; ASW-36P(1) [soluble starch 20 g/L, glucose 15 g/L, yeast extract 2 g/L, peptone 3 g/L, calcium carbonate 2 g/L, ammonium sulphate 0.5 g/L, corn steep liquor 2 g/L, sodium chloride 2 g/L, magnesium phosphate 5 g/L,cobalt chloride 0.001 g/L and TSS 1 ml/L (copper sulphate 7 g, ferrous sulphate 1 g, manganese chloride 8 g,
zinc sulphate 2 g and demineralized water 1 L), made in 75% ASW pH 7.3 - 7.6]; ASW-1M [glycerol 30 g/L, glucose 3 g/L, yeast extract 2 g/L, sodium chloride 3 g/L, sodium nitrate 1 g/L, calcium carbonate 3 g/L, peptone3 g/L and TSS 1 ml/L, made in 75% ASW, pH 7.0 - 7.2]. The flasks were incubated for 96 h at 30˚C on rotary
shaker at 200 rpm. The 1 ml of harvested whole broth was extracted with equal amount of methanol and centrifuged at 4000 rpm for 10 min. The supernatant was tested for antimicrobial activity by agar well diffusion method using different pathogenic strains [14]. LR grade chemicals were used in the study.
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