再生丝素与无机纳米粒子复合膜的结构与性能

用溶胶-凝胶法制备了纳米二氧化钛再生丝素复合膜,并用扫描电镜(SEM)、X射线(XRD)、热重分析(TGA、DTG)对复合丝素膜的结构与性能进行了表征。结果表明:加入纳米二氧化钛颗粒后再生丝素膜的热转变温度提高;再生丝素的结晶构象由S ilk I向S ilk II转变,结晶度增加。     

Characterization of Bacterial Strains Isolated from a Novel Seawater-based Retting Treatment of Hemp

Cultivable bacteria were isolated from seawater-based retting treatment of hemp, in which three of purified strains （SW- 1, SW- 2, and S-SW1） produced relatively high levels of pectinase activities, and also produced mannanases and xylanases. PCR-based entebacterial repetitive intergenic consensus primers （ERIC-PCR） were employed for fingerprinting DNA of the bacterial strains. The ERIC-PCR fingerprints of stains SW- 1, SW- 2, and S-SW1 were found to be different, and should be further identified for each isolate. Strains SW- 1 and SW- 2 were identified as Stenotrophomnas maltophilia, while strain S-SW1 was assigned to Ochrobactrum anthropi by BIOLOG system. These two species represented rhizosphere bacterial genera, and possibly were introduced by the hemp plants. These organisms seemed potentially capable of producing pectinase and hemicellulase, and thus effectively degrading the gum substances in the seawater retting. This research could be helpful for improving a novel seawater-based retting treatment of hemp.