The degradative characteristics of simazine （SIM）, microbial biomass carbon, plate counts of heterotrophic bacteria and most probably number （MPN） of SIM degraders in uninoculated non-rhizosphere soil, uninoculate...The degradative characteristics of simazine （SIM）, microbial biomass carbon, plate counts of heterotrophic bacteria and most probably number （MPN） of SIM degraders in uninoculated non-rhizosphere soil, uninoculated rhizosphere soil, inoculated non- rhizosphere soil, and inoculated rhizosphere soil were measured. At the initial concentration of 20 mg SIM/kg soil, the half-lives of SIM in the four treated soils were measured to be 73.0, 52.9, 16.9, and 7.8 d, respectively, and corresponding kinetic data fitted first-order kinetics. The experimental results indicated that higher degradation rates of SIM were observed in rhizosphere soils, especially in inoculated rhizosphere soil. The degradative characteristics of SIM were closely related to microbial process. Vegetation could enhance the magnitude of rhizosphere microbial communities, microbial biomass content, and heterotrophic bacterial community, but did little to influence those community components responsible for SIM degradation. This suggested that rhizosphere soil inoculated with microorganisms-degrading target herbicides was a useful pathway to achieve rapid degradation of the herbicides in soil.展开更多
为了探究山苍子精油中主要成分的绝对含量,建立了一种气相色谱-质谱/选择离子扫描(gas chromatography mass spectrometry/selective ion monitoring,GC-MS/SIM)方法,对其中主要成分(α-蒎烯、β-蒎烯、D-柠檬烯、1,8-桉叶素、芳樟醇、...为了探究山苍子精油中主要成分的绝对含量,建立了一种气相色谱-质谱/选择离子扫描(gas chromatography mass spectrometry/selective ion monitoring,GC-MS/SIM)方法,对其中主要成分(α-蒎烯、β-蒎烯、D-柠檬烯、1,8-桉叶素、芳樟醇、香茅醛、柠檬醛)进行了定性和定量分析。该方法简便、高效,在25 min内山苍子精油中各成分分离良好。各成分在一定范围内均线性关系良好(R2>0.999),精密度、稳定性及重复性均符合要求,平均加标回收率为93.40%~107.35%。结果表明:该方法符合方法学验证要求,可用于山苍子精油的多成分含量测定,并为其质量评价提供依据。展开更多
基于SIM908模块设计了一种可以监测用户跌倒情况的智能穿戴设备。设备的主控制器采用ATMEGA128单片机,以SIM908模块为基础,通过ADXL345加速度传感器来监测跌倒事件,采用光电式传感器进行生物数据监测,以了解用户脉搏情况。该穿戴设备实...基于SIM908模块设计了一种可以监测用户跌倒情况的智能穿戴设备。设备的主控制器采用ATMEGA128单片机,以SIM908模块为基础,通过ADXL345加速度传感器来监测跌倒事件,采用光电式传感器进行生物数据监测,以了解用户脉搏情况。该穿戴设备实现了基本的时间显示、监测脉搏、判断跌倒、GPS(global positioning system,全球定位系统)定位、GSM(global system for mobile communications,全球移动通信系统)报警、一键呼救等功能,实用性能好,适用于老人和小孩群体。展开更多
基金This work was supported by the National Key Basic Research Program （973） of China （No. 2002CB410804）the National Natural Science Foundation of China （No. 40201026）.
文摘The degradative characteristics of simazine （SIM）, microbial biomass carbon, plate counts of heterotrophic bacteria and most probably number （MPN） of SIM degraders in uninoculated non-rhizosphere soil, uninoculated rhizosphere soil, inoculated non- rhizosphere soil, and inoculated rhizosphere soil were measured. At the initial concentration of 20 mg SIM/kg soil, the half-lives of SIM in the four treated soils were measured to be 73.0, 52.9, 16.9, and 7.8 d, respectively, and corresponding kinetic data fitted first-order kinetics. The experimental results indicated that higher degradation rates of SIM were observed in rhizosphere soils, especially in inoculated rhizosphere soil. The degradative characteristics of SIM were closely related to microbial process. Vegetation could enhance the magnitude of rhizosphere microbial communities, microbial biomass content, and heterotrophic bacterial community, but did little to influence those community components responsible for SIM degradation. This suggested that rhizosphere soil inoculated with microorganisms-degrading target herbicides was a useful pathway to achieve rapid degradation of the herbicides in soil.
文摘为了探究山苍子精油中主要成分的绝对含量,建立了一种气相色谱-质谱/选择离子扫描(gas chromatography mass spectrometry/selective ion monitoring,GC-MS/SIM)方法,对其中主要成分(α-蒎烯、β-蒎烯、D-柠檬烯、1,8-桉叶素、芳樟醇、香茅醛、柠檬醛)进行了定性和定量分析。该方法简便、高效,在25 min内山苍子精油中各成分分离良好。各成分在一定范围内均线性关系良好(R2>0.999),精密度、稳定性及重复性均符合要求,平均加标回收率为93.40%~107.35%。结果表明:该方法符合方法学验证要求,可用于山苍子精油的多成分含量测定,并为其质量评价提供依据。
文摘基于SIM908模块设计了一种可以监测用户跌倒情况的智能穿戴设备。设备的主控制器采用ATMEGA128单片机,以SIM908模块为基础,通过ADXL345加速度传感器来监测跌倒事件,采用光电式传感器进行生物数据监测,以了解用户脉搏情况。该穿戴设备实现了基本的时间显示、监测脉搏、判断跌倒、GPS(global positioning system,全球定位系统)定位、GSM(global system for mobile communications,全球移动通信系统)报警、一键呼救等功能,实用性能好,适用于老人和小孩群体。
