从新疆酸马奶中分离到的7株乳酸菌中筛选到1株产胞外多糖能力较强的乳酸菌RB2,以苯酚-浓硫酸法测得其胞外多糖的产量为491.03μg/m L,经生理生化和16S r DNA序列分析法鉴定为发酵乳杆菌。通过正交试验确定该菌株产胞外多糖的最适发酵条...从新疆酸马奶中分离到的7株乳酸菌中筛选到1株产胞外多糖能力较强的乳酸菌RB2,以苯酚-浓硫酸法测得其胞外多糖的产量为491.03μg/m L,经生理生化和16S r DNA序列分析法鉴定为发酵乳杆菌。通过正交试验确定该菌株产胞外多糖的最适发酵条件是:发酵温度34℃,接种量1%,发酵时间12 h,此时胞外多糖的产量为511μg/m L。展开更多
Polysaccharides contain exocellular polysaccharide and endocelluar polydaccharide in fermentation liquid of Poria cocos.Moreover,endocelluar polydaccharide consisted of endocelluar water resolvable polydaccharide and ...Polysaccharides contain exocellular polysaccharide and endocelluar polydaccharide in fermentation liquid of Poria cocos.Moreover,endocelluar polydaccharide consisted of endocelluar water resolvable polydaccharide and endocelluar alkali resolvable polysaccharide.It was shown that contents of exocellular polysaccharide and endocelluar polydaccharide per liter fermentation liquid of Poria cocos were 5.43 gram and 4.09 gram,respetively.Water resolvable polysaccharide and alkali resolvable polysaccharide were extracted and isolated.The contents of water resolvable polysaccharide and alkali resovable polysaccharide per liter fermentation liquid of Poria cocos were 1.17 gram and 2.92 gram,respectively.展开更多
Caries is a disease of human dentition characterized by the loss of mineralized surfaces of the tooth;it is an infectious disease of the oral cavity in which biofilms play a causative role. Control of biofilms has tra...Caries is a disease of human dentition characterized by the loss of mineralized surfaces of the tooth;it is an infectious disease of the oral cavity in which biofilms play a causative role. Control of biofilms has traditionally relied on non-specific removal of plaque by mechanical means such as brushing, although it is difficult to remove biofilms by this method. Caries is also a widespread infection in children. Streptococcus mutans and S. sobrinus are important causative agents of caries. They produce a homologous exocellular polysaccharide called glucan, which strongly adheres to the enamel surface. This is a review of oral microbial biofilm formation by S. mutans and other related bacteria.展开更多
从海带中分离得到的12株乳酸菌中筛选得到一株具有较强产胞外多糖能力的菌株YYS-06,该菌株在发酵培养基中经72 h发酵可产154.6 mg/L多糖,经生理生化特性检测实验和16S r RNA序列分析将菌株YYS-06鉴定为植物乳杆菌(Lactobacillus plantar...从海带中分离得到的12株乳酸菌中筛选得到一株具有较强产胞外多糖能力的菌株YYS-06,该菌株在发酵培养基中经72 h发酵可产154.6 mg/L多糖,经生理生化特性检测实验和16S r RNA序列分析将菌株YYS-06鉴定为植物乳杆菌(Lactobacillus plantarum)。通过发酵条件优化正交实验确定菌株YYS-06最适发酵条件为:接种量1%、发酵温度34℃、发酵时间36 h,在此发酵条件下胞外多糖产量为269.3 mg/L。目前YYS-06菌株被中国典型培养物保藏中心(CCTCC)保藏,编号为CCTCC NO M2016512。展开更多
文摘Polysaccharides contain exocellular polysaccharide and endocelluar polydaccharide in fermentation liquid of Poria cocos.Moreover,endocelluar polydaccharide consisted of endocelluar water resolvable polydaccharide and endocelluar alkali resolvable polysaccharide.It was shown that contents of exocellular polysaccharide and endocelluar polydaccharide per liter fermentation liquid of Poria cocos were 5.43 gram and 4.09 gram,respetively.Water resolvable polysaccharide and alkali resolvable polysaccharide were extracted and isolated.The contents of water resolvable polysaccharide and alkali resovable polysaccharide per liter fermentation liquid of Poria cocos were 1.17 gram and 2.92 gram,respectively.
文摘Caries is a disease of human dentition characterized by the loss of mineralized surfaces of the tooth;it is an infectious disease of the oral cavity in which biofilms play a causative role. Control of biofilms has traditionally relied on non-specific removal of plaque by mechanical means such as brushing, although it is difficult to remove biofilms by this method. Caries is also a widespread infection in children. Streptococcus mutans and S. sobrinus are important causative agents of caries. They produce a homologous exocellular polysaccharide called glucan, which strongly adheres to the enamel surface. This is a review of oral microbial biofilm formation by S. mutans and other related bacteria.
文摘从海带中分离得到的12株乳酸菌中筛选得到一株具有较强产胞外多糖能力的菌株YYS-06,该菌株在发酵培养基中经72 h发酵可产154.6 mg/L多糖,经生理生化特性检测实验和16S r RNA序列分析将菌株YYS-06鉴定为植物乳杆菌(Lactobacillus plantarum)。通过发酵条件优化正交实验确定菌株YYS-06最适发酵条件为:接种量1%、发酵温度34℃、发酵时间36 h,在此发酵条件下胞外多糖产量为269.3 mg/L。目前YYS-06菌株被中国典型培养物保藏中心(CCTCC)保藏,编号为CCTCC NO M2016512。
