Available online on:15.06.2017@http://ijrdpl.com http://dx.doi.org/10.21276/IJRDPL.227 8-0238.2017.6(4). [2685][2686][2687][2688] ABSTRACT:The widespread use of antibiotics has led to an increase in multidrugresistant bacteria, which represent a serious risk of infection, in view of this problem the aim of this research was performed to characterize the antibacterial effect of ethanolic and petroleum ether extract of Polypodium decumanum leaves against three gram-positive bacteria(Staphylococcus aureus, Bacillus subtilius, and Streptococcus pyogenes) and three gram-negative bacteria(Pseudomonas aeruginosa, Escherichia coli, and Pseudomonas alcaligenes) in vitro by disc-diffusion method. In this study, we have taken 3 concentrations of Polypodium decumanumplant extract (ethanolic and petroleum ether) viz. 50 mg/ml, 100 mg/ml, and 200 mg/ml, and observed that the ethanolic extract of Polypodium decumanumof the concentration of 200 mg/ml showed higher antibacterial effect compare to other concentration against all 3 gram-positive bacteria and all 3 gram-negative bacteria, but not higher than standard drug Ampicillin.

10, 20, 30, 40, 50, 60, 70, up to 120 minute the maximum (581µgml -1 ) production of rifamycin was found developed S-10 strain for maximum production of rifamycin antibiotics (optimum time 15 minute) for further enhancement of rifamycin various parameter like age and size inoculum, pH of the culture medium, various carbohydrate, various amino acids, temperature, various Carbone sources, aeration were optimized. The maximum rifamycin conc. of 570 µgml -1 at 4.50 inoculums % with the age of 48 hrs. Inoculum was given even maximum rifamycin production with various age of inoculums (24, 36, 48, 60, 72 hrs.) with corresponding inoculums % (1.5, 2.5, 3.5, 4.5) in culture media, the optimum rifamycin 485 and 480 µgml -1 of rifamycin was producing M-6 and M-8 respectively medium amongst M-1, 2, 3, 4, 5, 6, 7, 8, 9 and M-10.