Creating a crop-heterogeneous system by intraspecific mixtures of different rice varieties can substantially reduce blast diseases. Such variety mixtures provide an ecological approach for effective disease control, m...Creating a crop-heterogeneous system by intraspecific mixtures of different rice varieties can substantially reduce blast diseases. Such variety mixtures provide an ecological approach for effective disease control, maintaining high yields with the minimum fungicide applications. Whether such an approach is universally applicable for random rice variety combinations and what is the variation pattern of the diseases under intercropping still remains unclear. We conducted two-year large-scale field experiments involving 47 rice varieties/lines and 98 variety-combinations to compare the occurrence of rice blast in monoculture and intercropping plots at multiple sites. In the experiments, the plant height of the selected tradi- tional varieties was about 30 cm taller, and their life cycle was 10 days longer, than that of the improved rice varieties. The monoculture included either traditional or modern rice varieties grown in separate plots. The intercropping included both traditional and modern rice varieties planted together in the same plots. Results from the field experiments under natural disease conditions demonstrated significant reduction for rice blast disease in intercropping plots, compared with that in monoculture plots. For traditional varieties, the average blast incidence reduced from -26% in monoculture to -10% in intercropping, and the disease severity reduced from -17 in monoculture to -5 in intercropping. For modern varieties, the average blast incidence reduced from -19% in monoculture to -10% in intercropping, and the severity from -10 in mono- culture to -4 in intercropping. Traditional rice varieties （-72%） had a much greater increase in the efficiency of disease control than modern varieties （-60%）. In addition, substantially lower values of variance in the blast incidence and severity was detected among the variety combinations in intercropping plots than in monoculture plots. Based on these results, we conclude that the intercropping or mixture of rice varieties greatly reduces the occurrence and variation of rice blast disease in particular variety combinations, which makes the intercropping system more stable and consistent for disease suppression on a large scale of rice cultivation.展开更多
目的探讨女性乳腺癌患者乳房切除术后性教育对负性情绪及性生活质量的影响。方法选取2019年9月至2020年9月北京市隆福医院124例接受乳房切除术的乳腺癌患者,采取简单随机分组,应用随机数字表法随机分为观察组与对照组,各62例。对照组术...目的探讨女性乳腺癌患者乳房切除术后性教育对负性情绪及性生活质量的影响。方法选取2019年9月至2020年9月北京市隆福医院124例接受乳房切除术的乳腺癌患者,采取简单随机分组,应用随机数字表法随机分为观察组与对照组,各62例。对照组术后实施乳腺科常规教育,观察组在对照组基础上实施性教育,教育时间均为5周。统计两组干预前后对性健康知识了解情况、汉密尔顿焦虑量表(Hamilton Anxiety Scale,HAMA)评分、汉密顿抑郁量表(Hamilton Depression Scale,HAMD)评分及女性性功能指数(Female Sexual Function Index,FSFI)评分。结果干预后观察组对性健康知识了解程度显著高于本组干预前及对照组干预后(P<0.05)。干预后观察组HAMA及HAMD评分显著低于本组干预前及对照组干预后(P<0.05)。干预后观察组FSFI各维度评分显著高于本组干预前及对照组干预后(P<0.05)。结论女性乳腺癌患者乳房切除术后性教育对负性情绪及性生活质量均有明显改善效果。展开更多
[Objective]This study was to establish a rapid,specific and simple method for quantitative determination of tetrachlorantraniliprole by 1H NMR.[Method]1H NMR spectroscopy was acquired with deuterium DMSO as the solven...[Objective]This study was to establish a rapid,specific and simple method for quantitative determination of tetrachlorantraniliprole by 1H NMR.[Method]1H NMR spectroscopy was acquired with deuterium DMSO as the solvent and maleic acid as internal standard under the conditions of temperature 25℃,pulses width 8.0μs,delay time 5 s,and scanning times 8.[Result]The hydrogen proton peaks of tetrachlorantraniliprole(δ=10.55)and maleic acid(δ=6.27)were taken as quantitative peaks.The peak area ratio y(As/Ar)and mass ratio x(ms/mr)were linearly regressed,and the correlation coefficient was 0.9999.The RSD value of repeatability test was 0.38%,and the RSD value of stability test was 0.77%.The content of tetrachlorantraniliprole was determined as 99.6%.[Conclusion]1H NMR spectroscopy can be used for quantitative determination of tetrachlorantraniliprole without standard reference,which is rapid,accurate and simple.展开更多
基金funded by the National Basic Research Program of China (2011CB100401)
文摘Creating a crop-heterogeneous system by intraspecific mixtures of different rice varieties can substantially reduce blast diseases. Such variety mixtures provide an ecological approach for effective disease control, maintaining high yields with the minimum fungicide applications. Whether such an approach is universally applicable for random rice variety combinations and what is the variation pattern of the diseases under intercropping still remains unclear. We conducted two-year large-scale field experiments involving 47 rice varieties/lines and 98 variety-combinations to compare the occurrence of rice blast in monoculture and intercropping plots at multiple sites. In the experiments, the plant height of the selected tradi- tional varieties was about 30 cm taller, and their life cycle was 10 days longer, than that of the improved rice varieties. The monoculture included either traditional or modern rice varieties grown in separate plots. The intercropping included both traditional and modern rice varieties planted together in the same plots. Results from the field experiments under natural disease conditions demonstrated significant reduction for rice blast disease in intercropping plots, compared with that in monoculture plots. For traditional varieties, the average blast incidence reduced from -26% in monoculture to -10% in intercropping, and the disease severity reduced from -17 in monoculture to -5 in intercropping. For modern varieties, the average blast incidence reduced from -19% in monoculture to -10% in intercropping, and the severity from -10 in mono- culture to -4 in intercropping. Traditional rice varieties （-72%） had a much greater increase in the efficiency of disease control than modern varieties （-60%）. In addition, substantially lower values of variance in the blast incidence and severity was detected among the variety combinations in intercropping plots than in monoculture plots. Based on these results, we conclude that the intercropping or mixture of rice varieties greatly reduces the occurrence and variation of rice blast disease in particular variety combinations, which makes the intercropping system more stable and consistent for disease suppression on a large scale of rice cultivation.
文摘目的探讨女性乳腺癌患者乳房切除术后性教育对负性情绪及性生活质量的影响。方法选取2019年9月至2020年9月北京市隆福医院124例接受乳房切除术的乳腺癌患者,采取简单随机分组,应用随机数字表法随机分为观察组与对照组,各62例。对照组术后实施乳腺科常规教育,观察组在对照组基础上实施性教育,教育时间均为5周。统计两组干预前后对性健康知识了解情况、汉密尔顿焦虑量表(Hamilton Anxiety Scale,HAMA)评分、汉密顿抑郁量表(Hamilton Depression Scale,HAMD)评分及女性性功能指数(Female Sexual Function Index,FSFI)评分。结果干预后观察组对性健康知识了解程度显著高于本组干预前及对照组干预后(P<0.05)。干预后观察组HAMA及HAMD评分显著低于本组干预前及对照组干预后(P<0.05)。干预后观察组FSFI各维度评分显著高于本组干预前及对照组干预后(P<0.05)。结论女性乳腺癌患者乳房切除术后性教育对负性情绪及性生活质量均有明显改善效果。
文摘[Objective]This study was to establish a rapid,specific and simple method for quantitative determination of tetrachlorantraniliprole by 1H NMR.[Method]1H NMR spectroscopy was acquired with deuterium DMSO as the solvent and maleic acid as internal standard under the conditions of temperature 25℃,pulses width 8.0μs,delay time 5 s,and scanning times 8.[Result]The hydrogen proton peaks of tetrachlorantraniliprole(δ=10.55)and maleic acid(δ=6.27)were taken as quantitative peaks.The peak area ratio y(As/Ar)and mass ratio x(ms/mr)were linearly regressed,and the correlation coefficient was 0.9999.The RSD value of repeatability test was 0.38%,and the RSD value of stability test was 0.77%.The content of tetrachlorantraniliprole was determined as 99.6%.[Conclusion]1H NMR spectroscopy can be used for quantitative determination of tetrachlorantraniliprole without standard reference,which is rapid,accurate and simple.
