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The isolation of bacteria associated with marine organisms has a restriction due to the fact that http://www.selleckchem.com/products/sch772984.html bioactive compound 1 (Djinni et?al. 2013) was isolated from the screening of only 22?strain isolates, representing a positive results, due to the fact that the search for novel antibiotics among hundreds of soil actinobacteria typically provides mainly the isolation of already known compounds (B��rdy 2005). It is noteworthy that this analysis http://www.selleckchem.com/products/Bortezomib.html has involved only a subset of the Streptomyces obtained from this algal genus, suggesting a potential for the discovery of other natural products. As reported in Tables?1 and S1, 100% of the isolated strains from Gausse and SM media showed antibacterial activity, whereas 66��66 and 42��85% obtained from chitin and SCA, respectively, were bioactive. This variation likely reflected the effect of media composition, which is consistent with previous observations (Webster et?al. 2001). The cell wall of strain WR1L1S8 contained ll-diaminopimelic acid and glycine, and whole-cell hydrolysates contained galactose as major sugar, indicating that this strain had a cell wall chemotype IC (Lechevalier and Lechevalier 1970). According to Lechevalier et?al. (1977), the phospholipid composition of the strain http://www.selleck.cn/products/gdc-0068.html contained a pattern type II actinomycetes strains which strengthened its belonging to Streptomyces genus. The physiological properties of the strain WR1L1S8 are shown in Table?2. This strain produced melanoid pigments on both ISP6 and ISP7 media. It was able to degrade adenine, guanine, hypoxanthine and Tween-80, but did not degrade inositol, raffinose, casein or gelatine. Growth occurred at 28 and 37��C at all tested pH values. The strain WR1L1S8 was able to utilize histidine, alanine threonine, proline, serine and glycine as nitrogen sources, but not cystein, tyrosine and tryptophane. Among the tested compounds, the strain utilized practically all the carbon sources. Based on these evidences, it was possible to establish chemotaxonomic properties typical of the genus Streptomyces. Regarding the WR1L1S8 strain identification as Streptomyces sp.