Frequency and dominance of Streptomyces in various sources have also been reported [11, 38, 39]. Majority of the isolates in this study possessed coiled mycelia selleck chemicals and the same morphology has been reported by Roes and Meyer . Spore morphology is considered as one of the important characteristic features in actinobacterial identification and it varies among the genus and species [13, 41]. Moreover, the results acquired in this study have been outlined in Bergey’s Manual of Systematic Bacteriology  and Laboratory manual for identification of actinomycetes . Diversity of FHPI cell line actinobacteria in Chesapeake Bay was also reported
similar to our mode of observations . Based on growth studies, it was made known that majority of the isolates grew well in modified SCA medium. This has been already reported in actinobacterial community isolated
from Bay of Bengal . Varied pigment production pattern was also observed among our isolates. Shirling and Gottileb  reported that the pigmentation selleck compound prototype can be used as markers for identification. Moreover, cultural characteristics and utilization of carbon by the isolates in different media (ISP-2 to ISP-7) also play a major role in identification of actinobacteria to generic level. It is also proved that different physiological characteristics will certainly influence the growth rate of actinobacteria [44, 45]. Actinobacteria are the main basis of clinically significant antibiotics . Recent reports revealed that about 4,607 patents have been issued on actinobacteria related product and process. The genus Adenosine Saccharopolyspora of Pseudonocardiaceae family is recognized for producing various antibiotics like vancomycin, erythromycin and rifamycins . Majority of our isolates exhibited appreciable antibacterial activity against tested clinical pathogens. Of three solvents used, ethyl acetate extract of Streptomyces sp. NIOT-VKKMA02 determined better inhibitory activity.
Earlier report  also revealed the effectiveness of ethyl acetate extracts from actinobacteria for antibacterial studies with that of other solvents. For the first of its kind, Grein and Meyers  have reported on antagonistic marine actinobacteria. Of their 66 isolates from marine sediments of New Jersey and Florida, 50% demonstrated antibiotic activity against Gram positive and Gram negative bacteria. Modest information on antimicrobial potential of marine actinobacteria from A & N Islands was previously reported. Of 88 marine actinobacterial isolates, only three isolates revealed noticeable antibacterial activity among test pathogens . However, another report  disclosed that, of 42 isolates, only limited bioactivity (58.4%) was observed among test pathogens studied.