Objective:To investigate the larvicidal and repellent efficacy of tetradecanoic acid against Aedes aegrpti（Ae.aegypti） L,and Culex quinquefasciatus（Cx.quinquefasciatus） Say（Diptera: Culicidae）.Methods:Larvicidal...Objective:To investigate the larvicidal and repellent efficacy of tetradecanoic acid against Aedes aegrpti（Ae.aegypti） L,and Culex quinquefasciatus（Cx.quinquefasciatus） Say（Diptera: Culicidae）.Methods:Larvicidal efficacy of tetradecanoic acid was tested at various concentrations against the early third instar larvae of Ae.aegypti and Cx.quinquefasciatus. The repellent activity was determined against two mosquito species at three concentrations viz..1.0.2.5 and 5.0 ppm under the laboratory conditions.Results:The tetradecanoic acid was found to be more effective against Cx.quinquefasciatus than Ae.aegypti larvae.The LC<sub>50</sub> values were 14.08 ppm and 25.10 ppm,respectively.Tetradecanoic acid showed lesser repellency against Ae.aegypti and Cx.quinquefasciatus.The highest repellency was observed in higher concentration of 5.0 mg/cm<sup>2</sup> provided 100%protection up to 60 and 90 min against Ae.aegypti and Cx.quinquefasciatus respectively.Conclusions:From the results it can be concluded the tetradecanoic acid is a potential for controlling Cx.quinquefasciatus and Ae.aegypti mosquitoes.展开更多
红外ATR光谱法(ATR-IR)用于山茶油中棕榈酸和十四烷酸含量的快速分析。配制了72个山茶油样本用于ATR光谱的采集,不同的光谱预处理方法用于光谱有效信息的提取,小波压缩(wavelet compression,WC)方法用于建模变量的优化,偏最小二乘回归(p...红外ATR光谱法(ATR-IR)用于山茶油中棕榈酸和十四烷酸含量的快速分析。配制了72个山茶油样本用于ATR光谱的采集,不同的光谱预处理方法用于光谱有效信息的提取,小波压缩(wavelet compression,WC)方法用于建模变量的优化,偏最小二乘回归(partial least square,PLS)用于脂肪酸含量的定量分析模型的构建。结果表明,ATR光谱经小波导数(wavelet derivative,WD)―标准正态变量变换(standard normal variate,SNV)预处理后,棕榈酸模型的预测相关系数(correlation coefficient of prediction,Rp)和预测均方根误差(root mean square error of prediction,RMSEP)分别为由原始光谱的0.789和3.332改善为0.908和2.653;十四烷酸模型的Rp和RMSEP分别由0.870和0.087改善为0.948和0.058;建模变量经WC预处理后由原始光谱的2 500个分别减小为190和180个,为山茶油中脂肪酸含量的测定提供了一种简便快速的分析方法。展开更多
文摘Objective:To investigate the larvicidal and repellent efficacy of tetradecanoic acid against Aedes aegrpti（Ae.aegypti） L,and Culex quinquefasciatus（Cx.quinquefasciatus） Say（Diptera: Culicidae）.Methods:Larvicidal efficacy of tetradecanoic acid was tested at various concentrations against the early third instar larvae of Ae.aegypti and Cx.quinquefasciatus. The repellent activity was determined against two mosquito species at three concentrations viz..1.0.2.5 and 5.0 ppm under the laboratory conditions.Results:The tetradecanoic acid was found to be more effective against Cx.quinquefasciatus than Ae.aegypti larvae.The LC<sub>50</sub> values were 14.08 ppm and 25.10 ppm,respectively.Tetradecanoic acid showed lesser repellency against Ae.aegypti and Cx.quinquefasciatus.The highest repellency was observed in higher concentration of 5.0 mg/cm<sup>2</sup> provided 100%protection up to 60 and 90 min against Ae.aegypti and Cx.quinquefasciatus respectively.Conclusions:From the results it can be concluded the tetradecanoic acid is a potential for controlling Cx.quinquefasciatus and Ae.aegypti mosquitoes.
文摘红外ATR光谱法(ATR-IR)用于山茶油中棕榈酸和十四烷酸含量的快速分析。配制了72个山茶油样本用于ATR光谱的采集,不同的光谱预处理方法用于光谱有效信息的提取,小波压缩(wavelet compression,WC)方法用于建模变量的优化,偏最小二乘回归(partial least square,PLS)用于脂肪酸含量的定量分析模型的构建。结果表明,ATR光谱经小波导数(wavelet derivative,WD)―标准正态变量变换(standard normal variate,SNV)预处理后,棕榈酸模型的预测相关系数(correlation coefficient of prediction,Rp)和预测均方根误差(root mean square error of prediction,RMSEP)分别为由原始光谱的0.789和3.332改善为0.908和2.653;十四烷酸模型的Rp和RMSEP分别由0.870和0.087改善为0.948和0.058;建模变量经WC预处理后由原始光谱的2 500个分别减小为190和180个,为山茶油中脂肪酸含量的测定提供了一种简便快速的分析方法。
