以2个转BtCry1Ac基因107杨株系及其未转基因对照为材料,研究转Bt基因107杨的根系分布特征。结果表明:1)垂直方向上,2个转基因株系与CK的总根系及各径级根长密度、表面积密度、体积密度以及生物量密度上均随土层深度的增加而显著降低,在0...以2个转BtCry1Ac基因107杨株系及其未转基因对照为材料,研究转Bt基因107杨的根系分布特征。结果表明:1)垂直方向上,2个转基因株系与CK的总根系及各径级根长密度、表面积密度、体积密度以及生物量密度上均随土层深度的增加而显著降低,在0~30 cm土层中,根长密度、根表面积密度、根体积密度及生物量密度均达到最大值,且显著高于其他土层;2)水平方向0~150 cm, 2个转基因株系与CK的总根表面积密度、总生物量密度随着距树干水平距离的增加呈现出先减小后增大的趋势;不同径级根系表面积密度、根长密度在距树干0~30 cm处达到最大值;3)2个转基因株系总根长密度、根表面积密度、根体积密度和生物量密度均小于对照,对照与转基因株系存在显著性差异,而2个转基因株系间无显著性差异;4)3个株系在根系分布中均以细根为主,且转基因株系细根径级的根长密度、根表面积密度表现为对照大于转基因株系且存在显著性差异,对照和转基因株系中根与粗根根长密度、根表面积密度无显著性差异。展开更多
Arthropod community structure and diversity were investigated in transgenic insect-resistant hybrid poplar 741 field trial plots, which had five isogenic clones with two genes （Bt. toxin [Cry IAc] and arrowhead prote...Arthropod community structure and diversity were investigated in transgenic insect-resistant hybrid poplar 741 field trial plots, which had five isogenic clones with two genes （Bt. toxin [Cry IAc] and arrowhead proteinase inhibitor [API]） in comparison to control plots. Transgenic poplar clones were investigated according to their insect resistance （high and medium resistant clones）, being systematically probed into varying levels with feeding tests before. Investigations were carded out during three years （2002, 2003 and 2005）. The results indicated that among the basal species, transgenic plants in general had lower amounts of phytophagous insects, and an increased quantity of neutral arthropods such as saprophytic and strolling species. Among the top and intermediate species in transgenic variants, the quantity of predatory natural enemies was increased, while the amount of parasitoid ones was slightly reduced. The arthropod community characteristic indices were analyzed from different aspects in the three variants. It was discovered that, not only the characteristic indices of the whole arthropod community, but also the characteristic indices of the sub-communities （such as natural enemy, pest and neutral arthropods） and the functional groups categorized by their feeding patterns, showed a higher diversity and evenness and a lower dominancy concentration indices in the high-resistant and medium-resistant plots compared with the control. Transgenic poplar 741 showed improved ecological effects both in partial and total aspects. It could be concluded that composition and structure of the arthropod community in plots with transgenic insect-resistant poplar were turned to be more reasonable and itsdiversity and stability was enhanced.展开更多
[目的]分析2014-2018年广西苍梧县鼻咽癌疾病负担水平及变化趋势.[方法]根据苍梧县肿瘤登记处上报的2014-2018年鼻咽癌发病和死亡数据,计算粗发病率和死亡率及其标化率、过早死亡损失寿命年(years of life lost,YLLs)、伤残损失寿命年(y...[目的]分析2014-2018年广西苍梧县鼻咽癌疾病负担水平及变化趋势.[方法]根据苍梧县肿瘤登记处上报的2014-2018年鼻咽癌发病和死亡数据,计算粗发病率和死亡率及其标化率、过早死亡损失寿命年(years of life lost,YLLs)、伤残损失寿命年(years lived with disability,YLDs)和伤残调整寿命年(disability-adjusted life years,DALYs)等指标.通过Joinpoint回归模型计算鼻咽癌发病率、死亡率及DALYs率的平均年度变化百分比(average annual per-centage change,AAPC)并分析其变化趋势.[结果]2014-2018年广西苍梧县累计报告鼻咽癌发病数599例(包括男性453例和女性146例),死亡数304例(包括男性237例和女性67例).2014-2018年广西苍梧县因鼻咽癌损失的DALYs为5386.47人年,其中YLLs和YLDs分别占92.99%和7.01%.2014-2018年鼻咽癌发病率(AAPC=-5.3%)、死亡率(AAPC=-11.6%)和DALYs率(AAPC=-7.6%)总体呈下降趋势,但变化趋势无统计学意义(P>0.05).不同性别的发病率、死亡率和DALYs率变化趋势与总体趋势基本一致,其中女性鼻咽癌的死亡率和DALYs率呈显著下降趋势:女性鼻咽癌死亡率由2014年的11.14/10万下降至2018年的4.19/10万,年均下降21.4%(P<0.01);DALYs率由2014年的180.15/10万人年下降至2018年的66.49/10万人年,年均下降23.3%(P<0.01).[结论]2014-2018年广西苍梧县居民鼻咽癌的发病率、死亡率和DALYs率均有所下降,尤其女性鼻咽癌的疾病负担呈明显下降趋势.但鼻咽癌仍是苍梧县需要重点防控的区域性高发肿瘤,今后还需加强鼻咽癌的早诊早治和筛查工作,针对高危人群采取积极的干预措施,降低鼻咽癌的疾病负担.展开更多
文摘以2个转BtCry1Ac基因107杨株系及其未转基因对照为材料,研究转Bt基因107杨的根系分布特征。结果表明:1)垂直方向上,2个转基因株系与CK的总根系及各径级根长密度、表面积密度、体积密度以及生物量密度上均随土层深度的增加而显著降低,在0~30 cm土层中,根长密度、根表面积密度、根体积密度及生物量密度均达到最大值,且显著高于其他土层;2)水平方向0~150 cm, 2个转基因株系与CK的总根表面积密度、总生物量密度随着距树干水平距离的增加呈现出先减小后增大的趋势;不同径级根系表面积密度、根长密度在距树干0~30 cm处达到最大值;3)2个转基因株系总根长密度、根表面积密度、根体积密度和生物量密度均小于对照,对照与转基因株系存在显著性差异,而2个转基因株系间无显著性差异;4)3个株系在根系分布中均以细根为主,且转基因株系细根径级的根长密度、根表面积密度表现为对照大于转基因株系且存在显著性差异,对照和转基因株系中根与粗根根长密度、根表面积密度无显著性差异。
文摘Arthropod community structure and diversity were investigated in transgenic insect-resistant hybrid poplar 741 field trial plots, which had five isogenic clones with two genes （Bt. toxin [Cry IAc] and arrowhead proteinase inhibitor [API]） in comparison to control plots. Transgenic poplar clones were investigated according to their insect resistance （high and medium resistant clones）, being systematically probed into varying levels with feeding tests before. Investigations were carded out during three years （2002, 2003 and 2005）. The results indicated that among the basal species, transgenic plants in general had lower amounts of phytophagous insects, and an increased quantity of neutral arthropods such as saprophytic and strolling species. Among the top and intermediate species in transgenic variants, the quantity of predatory natural enemies was increased, while the amount of parasitoid ones was slightly reduced. The arthropod community characteristic indices were analyzed from different aspects in the three variants. It was discovered that, not only the characteristic indices of the whole arthropod community, but also the characteristic indices of the sub-communities （such as natural enemy, pest and neutral arthropods） and the functional groups categorized by their feeding patterns, showed a higher diversity and evenness and a lower dominancy concentration indices in the high-resistant and medium-resistant plots compared with the control. Transgenic poplar 741 showed improved ecological effects both in partial and total aspects. It could be concluded that composition and structure of the arthropod community in plots with transgenic insect-resistant poplar were turned to be more reasonable and itsdiversity and stability was enhanced.
文摘[目的]分析2014-2018年广西苍梧县鼻咽癌疾病负担水平及变化趋势.[方法]根据苍梧县肿瘤登记处上报的2014-2018年鼻咽癌发病和死亡数据,计算粗发病率和死亡率及其标化率、过早死亡损失寿命年(years of life lost,YLLs)、伤残损失寿命年(years lived with disability,YLDs)和伤残调整寿命年(disability-adjusted life years,DALYs)等指标.通过Joinpoint回归模型计算鼻咽癌发病率、死亡率及DALYs率的平均年度变化百分比(average annual per-centage change,AAPC)并分析其变化趋势.[结果]2014-2018年广西苍梧县累计报告鼻咽癌发病数599例(包括男性453例和女性146例),死亡数304例(包括男性237例和女性67例).2014-2018年广西苍梧县因鼻咽癌损失的DALYs为5386.47人年,其中YLLs和YLDs分别占92.99%和7.01%.2014-2018年鼻咽癌发病率(AAPC=-5.3%)、死亡率(AAPC=-11.6%)和DALYs率(AAPC=-7.6%)总体呈下降趋势,但变化趋势无统计学意义(P>0.05).不同性别的发病率、死亡率和DALYs率变化趋势与总体趋势基本一致,其中女性鼻咽癌的死亡率和DALYs率呈显著下降趋势:女性鼻咽癌死亡率由2014年的11.14/10万下降至2018年的4.19/10万,年均下降21.4%(P<0.01);DALYs率由2014年的180.15/10万人年下降至2018年的66.49/10万人年,年均下降23.3%(P<0.01).[结论]2014-2018年广西苍梧县居民鼻咽癌的发病率、死亡率和DALYs率均有所下降,尤其女性鼻咽癌的疾病负担呈明显下降趋势.但鼻咽癌仍是苍梧县需要重点防控的区域性高发肿瘤,今后还需加强鼻咽癌的早诊早治和筛查工作,针对高危人群采取积极的干预措施,降低鼻咽癌的疾病负担.
