title: [Spectra characteristic of degradation products and inhibition mechanism of Streptomyces sp. HJC-D1 on Microcystis aeruginosa].
abstract: Using 3-D fluorescence spectroscopy (EEMs), infrared spectroscopy (FTIR) and transmission electron microscope (TEM), the composition and characteristics of dissolved organic matter (DOM) from degradation products and inhibition mechanism of Streptomyces sp. HJC-D1 on Microcystis aeruginosa were studied. The results indicated that the growth of M. aeruginosa could be effectively inhibited by the fermentation broth of HJC-D1 and the removal efficiency was 72.6% +/- 5.5% with an addition dosage of 5% (see system for text). The main fluorescent material in DOM was humic-like acid, and the molecular weight of degradation products was around 1 000 Da. The cell structure of M. aeruginosa was damaged during the biodegradation process. With the results of TEM, the antialgal mechanism was speculated as following: M. aeruginosa cell walls are destroyed by antialgal bacterium, and organelles are released which resulted in the death of algae cell finally.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. ky020241@hotmail.com
authors.forename: Yun
authors.initials: Y
authors.lastname: Kong
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Xiang-Yang
authors.initials: XY
authors.lastname: Xu
authors.forename: Liang
authors.initials: L
authors.lastname: Zhu
mesh_terms: D000898:Antibiosis; D001673:Biodegradation, Environmental; D005068:Eutrophication; D050296:Microbial Viability; D046931:Microcystis / Q000254:growth & development* / Q000648:ultrastructure; D013050:Spectrometry, Fluorescence / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013302:Streptomyces / Q000502:physiology*