[Objective]The study aimed to screen the starch-degrading bacterium in bagasse and carry on the identification of strains s2g5-1 and s3g4-8.[Method]By using a variety of selective media,varieties of starch degrading b...[Objective]The study aimed to screen the starch-degrading bacterium in bagasse and carry on the identification of strains s2g5-1 and s3g4-8.[Method]By using a variety of selective media,varieties of starch degrading bacterium were isolated from the sugar cane bagasse form different stages of natural fermentation,then,primary screening and secondary screening were performed.[Result] Starch-degrading strains s2g5-1 and s3g4-8 were screened,and they were identified as Bacillus amyloliquefaciens according to their morphological,physiological,biochemical and molecular characteristics.[Conclusion]The research provided theoretical basis for factory application of bagasse.展开更多
文摘本研究通过观察抗CXCR4单克隆抗体12G5对Ara C杀伤HL-60细胞效应的影响,评价其在白血病骨髓 残留病变中的治疗价值。培养并共培养HL-60细胞,在共培养体系中采用12G5(10μg／ml)阻抑基质细胞SDF-1的 生物作用后,通过MTT法及细胞形态学观察检测不同浓度Ara c对HL-60细胞杀伤作用的变化。药物杀伤效应曲 线显示,在20μg／ml Ara C组,对照组中前2天A540值明显下降,但从3-4天开始出现上升,而加12G5实验组中 A540值虽然下降平缓,但持续下降,并于观察第5天后低于对照组,整个观察期中未出现反弹。在40μg／ml Ara C 组,对照组A540在0-3天明显下降,从第4天开始回升,于第5-6天与实验组曲线交叉,从7-12天时照组A540值 总体呈上升趋势,并明显高于实验组,而加12G5实验组曲线在整个观察期间虽然在7-9天有小幅度攀升,但总的 趋势是下降。细胞形态学观察显示,在两个浓度组,对照组HL-60细胞数量最初明显减少,随着培养时间延长,细 胞数量逐渐增多,实验组结果正相反。结论:12G5减弱Ara C对HL-60细胞的早期杀伤作用,但12G5增强Ara C 总体杀伤作用,同时,延缓HL-60细胞对Ara c的耐药性,因此12G5有助于白血病骨髓残留病变的治疗。
基金Supported by the Central Public-interest Scientific Institution Basal Research Fund(2008hzs1J021,2009hzs1J033)~~
文摘[Objective]The study aimed to screen the starch-degrading bacterium in bagasse and carry on the identification of strains s2g5-1 and s3g4-8.[Method]By using a variety of selective media,varieties of starch degrading bacterium were isolated from the sugar cane bagasse form different stages of natural fermentation,then,primary screening and secondary screening were performed.[Result] Starch-degrading strains s2g5-1 and s3g4-8 were screened,and they were identified as Bacillus amyloliquefaciens according to their morphological,physiological,biochemical and molecular characteristics.[Conclusion]The research provided theoretical basis for factory application of bagasse.
