Characterization and identification of filamentous bacterium XJ-16 and analysis of its bioactive components

Abstract

Actinomycetes, which can produce a variety of bioactive compounds in the metabolic process, is one of the important sources of novel drugs, enzymes, anti-tumor drugs and enzyme inhibitors. It has been the focus of researchers to find and develop Actinomycetes with special characters. Strain XJ-16 is a blue alkali-resistant filamentous bacterium with high antimicrobial activity isolated from saline-alkali land of Xinjiang. Based on the classification, the enzyme production, metabolite antibacterial activity, and antibacterial substance isolation of XJ-16 were explored. which showed that XJ-16 belongs to the blue group of Streptomyces sp, and it can secrete cellulase, lipase, urease, protease, catalase and oxidase during metabolism. In addition, the bacteriostatic substance secreted by the strain XJ-16 showed inhibitory effects against both Gram-positive and Gram-negative bacteria, as well as the yeast Candida albicans. Then it was found that the bacteriostasis produced by XJ-16 has strong tolerance to acid, weak tolerance to alkali, and easy to be inactivated. After tested by HPLC, the retention time of antimicrobial substance was 13.261 min. This study provides a theoretical basis for the search for new antibacterial compounds and the further development of blue alkaline Actinomycetes XJ-16.

Performance evaluation of standardized residency training based on non-parametric intelligent group decision method

“…Employing history taking as an output indicator in this study responds to the national call for enhancing residents' medical history-taking abilities. Additionally, it holds practical significance by effectively monitoring and improving residents' competence in medical history taking [26,27] .…”