Sanchuan ham is appreciated in Yunnan Province,China,for its characteristic flavor and taste,while the microbial community structure and biogenic amines content remain unclear during fermentation processes.In this stu...Sanchuan ham is appreciated in Yunnan Province,China,for its characteristic flavor and taste,while the microbial community structure and biogenic amines content remain unclear during fermentation processes.In this study,we explored the physicochemical property,biogenic amines concentration and microbial diversity of external and internal Sanchuan ham by high-throughput sequencing during the processing of Sanchuan ham.Results showed that the nitrite remained at a stable level of 0.15 mg/kg which was significantly lower than the national health standard safety level of 20 mg/kg.In addition,compared with fresh hams,the content of total free amino acids in ripe Sanchuan ham has grown 14 folds;sour and bitter were the main tastes of Sanchuan ham.Notably,the concentration of cadaverine was the highest of all biogenic amines during the entire fermentation period.At the bacterial phyla level,Firmicutes and Actinobacteria were the two main phyla,while at the genus level,Staphylococcus was a significant strain throughout the whole fermentation.Moreover,the dry stage has a great impact on the succession change of microbial community structure.Simultaneously,the change trends and composition of bacteria in the interior have slight discrepancies with those of the exterior of Sanchuan ham.展开更多
利用黄河中游干旱半干旱区三川河流域20世纪80年代的降雨径流资料,构建了三川河流域的分布式水文模型SWAT(Soil and Water Assessment Tool),并对三川河流域的月平均流量过程进行了模拟,分析了月径流量的变化特征。模拟结果表明,月平均...利用黄河中游干旱半干旱区三川河流域20世纪80年代的降雨径流资料,构建了三川河流域的分布式水文模型SWAT(Soil and Water Assessment Tool),并对三川河流域的月平均流量过程进行了模拟,分析了月径流量的变化特征。模拟结果表明,月平均流量较实测的结果偏大,模型率定期和验证期的Nash-Sutticliffe效率系数分别为0.711和0.725。虽然Nash-Sutticliffe效率系数基本符合精度要求,但是模型中一些参数已经达到模型设置的临界值,进一步分析得出,由于流域上雨量站的数据不够,以及中国与美国土壤、土地利用数据库编码的差异,使得模型模拟结果受到影响,并且三川河流域自70年代以来水土保持措施蓄水效益较为显著,在一定程度上使得径流量减少,使得模拟结果偏大。展开更多
选SQL Server 2005作为河道空间数据库和属性数据库的管理系统,以Visual Studio 2005和ArcEngine 9.3组件为开发工具,利用嵌入式开发技术,研发了一套河道地理信息管理系统。该系统对河道的水利工程信息、水环境信息和防汛信息提供专题...选SQL Server 2005作为河道空间数据库和属性数据库的管理系统,以Visual Studio 2005和ArcEngine 9.3组件为开发工具,利用嵌入式开发技术,研发了一套河道地理信息管理系统。该系统对河道的水利工程信息、水环境信息和防汛信息提供专题查询、分析、统计和更新等,加强了用户的管理和辅助操作功能,实现了河道资源数据的科学信息化管理,并为相关部门提供分析指导和决策依据。该系统研发结果在三川河流域河道信息管理中得到了稳定运行。展开更多
基金funded by National Natural Science Foundation of China(31460445)Science and Technology Talents and Platform Program of Yunnan Province,No.202105AF150049Yunnan University Key Laboratory of Food Microbial Resources and Utilization(Yunjiaofa[2018]No.135)。
文摘Sanchuan ham is appreciated in Yunnan Province,China,for its characteristic flavor and taste,while the microbial community structure and biogenic amines content remain unclear during fermentation processes.In this study,we explored the physicochemical property,biogenic amines concentration and microbial diversity of external and internal Sanchuan ham by high-throughput sequencing during the processing of Sanchuan ham.Results showed that the nitrite remained at a stable level of 0.15 mg/kg which was significantly lower than the national health standard safety level of 20 mg/kg.In addition,compared with fresh hams,the content of total free amino acids in ripe Sanchuan ham has grown 14 folds;sour and bitter were the main tastes of Sanchuan ham.Notably,the concentration of cadaverine was the highest of all biogenic amines during the entire fermentation period.At the bacterial phyla level,Firmicutes and Actinobacteria were the two main phyla,while at the genus level,Staphylococcus was a significant strain throughout the whole fermentation.Moreover,the dry stage has a great impact on the succession change of microbial community structure.Simultaneously,the change trends and composition of bacteria in the interior have slight discrepancies with those of the exterior of Sanchuan ham.
文摘利用黄河中游干旱半干旱区三川河流域20世纪80年代的降雨径流资料,构建了三川河流域的分布式水文模型SWAT(Soil and Water Assessment Tool),并对三川河流域的月平均流量过程进行了模拟,分析了月径流量的变化特征。模拟结果表明,月平均流量较实测的结果偏大,模型率定期和验证期的Nash-Sutticliffe效率系数分别为0.711和0.725。虽然Nash-Sutticliffe效率系数基本符合精度要求,但是模型中一些参数已经达到模型设置的临界值,进一步分析得出,由于流域上雨量站的数据不够,以及中国与美国土壤、土地利用数据库编码的差异,使得模型模拟结果受到影响,并且三川河流域自70年代以来水土保持措施蓄水效益较为显著,在一定程度上使得径流量减少,使得模拟结果偏大。
文摘选SQL Server 2005作为河道空间数据库和属性数据库的管理系统,以Visual Studio 2005和ArcEngine 9.3组件为开发工具,利用嵌入式开发技术,研发了一套河道地理信息管理系统。该系统对河道的水利工程信息、水环境信息和防汛信息提供专题查询、分析、统计和更新等,加强了用户的管理和辅助操作功能,实现了河道资源数据的科学信息化管理,并为相关部门提供分析指导和决策依据。该系统研发结果在三川河流域河道信息管理中得到了稳定运行。
