目的 通过比较澳大利亚、韩国、新加坡、以色列、印度5个国家在检测、控制传播和疫苗接种方面的举措与成效,为全球疫情防控策略提供建议或证据支持。方法 从Our World in Data网站获取澳大利亚、韩国、新加坡、以色列、印度5个国家2020...目的 通过比较澳大利亚、韩国、新加坡、以色列、印度5个国家在检测、控制传播和疫苗接种方面的举措与成效,为全球疫情防控策略提供建议或证据支持。方法 从Our World in Data网站获取澳大利亚、韩国、新加坡、以色列、印度5个国家2020年1月21日—2021年12月31日新冠疫情相关数据,通过比较每日检测人数与每日新增病例数、牛津–紧缩指数与每日新增病例数、每百人完全接种新冠疫苗人数与每日新增死亡数的关系,结合国家基本特征,研究分析各国在寻找传染源、切断传播途径、保护易感人群方面所执行的非药物干预措施和疫苗接种工作的效果。结果 增大检测力度在一定程度上控制了疫情进一步流行,且多在检测数达到顶峰后新增确诊人数开始下降;在疫情形势趋于严峻时,各国牛津–紧缩指数升高,随着疫情趋于缓和,该指数有所下降,但易导致疫情反弹;随着疫苗完全接种率的升高,新冠肺炎病死率有所下降。结论 世界各国应积极借鉴国际经验,紧密结合本国国情,遵循流行病学规律,从控制传染源、切断传播途径和保护易感人群三个方面入手,积极采取NPIs、大力推进新冠疫苗及加强针的普及接种与进一步研发,共同应对这一全球性公共卫生问题挑战。展开更多
[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 ...[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 B. juncea materials from western China were used for the canonical correlation analysis, and canonical correlations between each pair of the four ecological character (containing 18 variables) were verified, including yield characters (5 variables), caulis characters (6 variables), branch characters (3 variables) and pod characters (3 variables). [Result] Yield per plant of B. juncea in western China suffered a tremendous influence from effective pod number per plant while was not significantly affected by the total pod number per plant, seed number per pod and 1 000-seed weight; the most important character related with the yield character of B. juncea in western China was caulis character, followed by the branch character and pod character; yield characters, caulis characters, branch characters and pod characters of B. juncea in western China were closely correlated. [Conclusion] In order to improve the yield characters of B. juncea in western China, caulis characters should be focused on, followed by branch characters and pod characters; rapeseed varieties with high performance in total pod number per plant and effective pod number per plant should be chosen through the perspectives of effective branch number, plant height, pod number of main inflorescence, fruit stalk number of main inflorescence and other traits, while rapeseed varieties with high performance in seed number per pod and 1 000-seed weight should be chosen through the perspectives of beak length and other traits.展开更多
目的 描述英国、美国、德国、瑞典和俄罗斯的非药物干预措施(non-pharmaceutical interventions,NPIs)和疫苗接种对新冠肺炎疫情流行特征的影响,并比较各国防控措施的有效性。方法 在Our World in Data数据库收集2020年1月1日—2021年12...目的 描述英国、美国、德国、瑞典和俄罗斯的非药物干预措施(non-pharmaceutical interventions,NPIs)和疫苗接种对新冠肺炎疫情流行特征的影响,并比较各国防控措施的有效性。方法 在Our World in Data数据库收集2020年1月1日—2021年12月31日期间上述5个国家的疫情数据,通过绘制时间趋势图并计算Pearson相关系数,比较5个国家每百人新增检测数、牛津-紧缩指数、每百人完全接种新冠疫苗人数等3个指标与七日滚动病死率的关系,探究各国在控制传染源、切断传播途径、保护易感人群方面实施的NPIs和疫苗接种的效果。结果 5个国家的新增检测数在疫情初期快速上升,之后保持较高的检测水平,而各国七日滚动病死率在疫情初期达到峰值后下降,除俄罗斯外,其余4国每百人新增检测数与七日滚动病死率的相关系数在-0.471--0.256之间,均为负值;各国紧缩指数在疫情初期均升高,形势缓和后有不同程度的下降,各国紧缩指数与七日滚动病死率的相关系数在0.156-0.486之间,均为正值;随着疫苗完全接种率的升高,新冠肺炎病死率有所下降,除俄罗斯外,其余4国每百人完全接种疫苗人数与七日滚动病死率的相关系数均为负值(-0.817--0.289)。结论 NPIs和疫苗覆盖是新冠肺炎疫情防控的有效措施,各国应坚持二者结合控制疫情。展开更多
文摘目的 通过比较澳大利亚、韩国、新加坡、以色列、印度5个国家在检测、控制传播和疫苗接种方面的举措与成效,为全球疫情防控策略提供建议或证据支持。方法 从Our World in Data网站获取澳大利亚、韩国、新加坡、以色列、印度5个国家2020年1月21日—2021年12月31日新冠疫情相关数据,通过比较每日检测人数与每日新增病例数、牛津–紧缩指数与每日新增病例数、每百人完全接种新冠疫苗人数与每日新增死亡数的关系,结合国家基本特征,研究分析各国在寻找传染源、切断传播途径、保护易感人群方面所执行的非药物干预措施和疫苗接种工作的效果。结果 增大检测力度在一定程度上控制了疫情进一步流行,且多在检测数达到顶峰后新增确诊人数开始下降;在疫情形势趋于严峻时,各国牛津–紧缩指数升高,随着疫情趋于缓和,该指数有所下降,但易导致疫情反弹;随着疫苗完全接种率的升高,新冠肺炎病死率有所下降。结论 世界各国应积极借鉴国际经验,紧密结合本国国情,遵循流行病学规律,从控制传染源、切断传播途径和保护易感人群三个方面入手,积极采取NPIs、大力推进新冠疫苗及加强针的普及接种与进一步研发,共同应对这一全球性公共卫生问题挑战。
基金Supported by National Natural Science Foundation(30760122)National High-Tech Research and Development Program(863Program)(2009AA101105)+1 种基金Faculty Construction of 211 Project(SZTD-211-02)Project of Introducing Advanced Agricultural Science and Technology of Ministry of Agriculture(948Program)(2010-Z54)~~
文摘[Objective] The study aimed at exploring the relationship among the agronomic characters of B. juncea in western China, in order to provide scientific basis for the breeding of B. juncea in western China. [Method] 39 B. juncea materials from western China were used for the canonical correlation analysis, and canonical correlations between each pair of the four ecological character (containing 18 variables) were verified, including yield characters (5 variables), caulis characters (6 variables), branch characters (3 variables) and pod characters (3 variables). [Result] Yield per plant of B. juncea in western China suffered a tremendous influence from effective pod number per plant while was not significantly affected by the total pod number per plant, seed number per pod and 1 000-seed weight; the most important character related with the yield character of B. juncea in western China was caulis character, followed by the branch character and pod character; yield characters, caulis characters, branch characters and pod characters of B. juncea in western China were closely correlated. [Conclusion] In order to improve the yield characters of B. juncea in western China, caulis characters should be focused on, followed by branch characters and pod characters; rapeseed varieties with high performance in total pod number per plant and effective pod number per plant should be chosen through the perspectives of effective branch number, plant height, pod number of main inflorescence, fruit stalk number of main inflorescence and other traits, while rapeseed varieties with high performance in seed number per pod and 1 000-seed weight should be chosen through the perspectives of beak length and other traits.
文摘目的 描述英国、美国、德国、瑞典和俄罗斯的非药物干预措施(non-pharmaceutical interventions,NPIs)和疫苗接种对新冠肺炎疫情流行特征的影响,并比较各国防控措施的有效性。方法 在Our World in Data数据库收集2020年1月1日—2021年12月31日期间上述5个国家的疫情数据,通过绘制时间趋势图并计算Pearson相关系数,比较5个国家每百人新增检测数、牛津-紧缩指数、每百人完全接种新冠疫苗人数等3个指标与七日滚动病死率的关系,探究各国在控制传染源、切断传播途径、保护易感人群方面实施的NPIs和疫苗接种的效果。结果 5个国家的新增检测数在疫情初期快速上升,之后保持较高的检测水平,而各国七日滚动病死率在疫情初期达到峰值后下降,除俄罗斯外,其余4国每百人新增检测数与七日滚动病死率的相关系数在-0.471--0.256之间,均为负值;各国紧缩指数在疫情初期均升高,形势缓和后有不同程度的下降,各国紧缩指数与七日滚动病死率的相关系数在0.156-0.486之间,均为正值;随着疫苗完全接种率的升高,新冠肺炎病死率有所下降,除俄罗斯外,其余4国每百人完全接种疫苗人数与七日滚动病死率的相关系数均为负值(-0.817--0.289)。结论 NPIs和疫苗覆盖是新冠肺炎疫情防控的有效措施,各国应坚持二者结合控制疫情。