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浓硫酸处理对邵阳市郊野大豆种子发芽的影响 被引量:5
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作者 胡金龙 段林东 +2 位作者 徐元茜 李威 钟巧英 《现代农业科技》 2018年第24期1-2,5,共3页
为探究破除邵阳市郊野大豆种子硬实的方法,研究浓硫酸不同处理时间对其发芽的影响。结果表明,在最适温度下,浓硫酸处理45 min的小粒种子发芽率和发芽势均最高,分别达99.50%、97.50%;浓硫酸处理12 min的大粒种子发芽率和发芽势均最高,分... 为探究破除邵阳市郊野大豆种子硬实的方法,研究浓硫酸不同处理时间对其发芽的影响。结果表明,在最适温度下,浓硫酸处理45 min的小粒种子发芽率和发芽势均最高,分别达99.50%、97.50%;浓硫酸处理12 min的大粒种子发芽率和发芽势均最高,分别达99.50%、98.50%。由此表明,用浓硫酸处理可以去除邵阳市郊野大豆种子硬实现象,有效地促进种子萌发。 展开更多
关键词 野大豆 浓硫酸处理 发芽率 发芽势 湖南邵阳
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成渝城市群碳平衡空间分异与优化对策
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作者 周波 许源溪 冯田 《长江流域资源与环境》 CAS CSSCI CSCD 北大核心 2024年第8期1650-1662,共13页
探究城市群尺度碳平衡空间分异,为统筹城市群区域绿色协调发展提供科学支撑。以成渝城市群42个城市为研究对象,核算2005、2010、2015、2020年各城市的碳平衡经济贡献系数和生态支持系数,利用二阶聚类法进行碳平衡分区。区域生态碳平衡... 探究城市群尺度碳平衡空间分异,为统筹城市群区域绿色协调发展提供科学支撑。以成渝城市群42个城市为研究对象,核算2005、2010、2015、2020年各城市的碳平衡经济贡献系数和生态支持系数,利用二阶聚类法进行碳平衡分区。区域生态碳平衡呈“先下降后上升”趋势,空间上呈现“中间低,周围高”的特征;经济碳平衡呈‘先下降后上升’趋势,空间上呈现“西高东低”的特征;根据聚类结果将42个城市划分为碳源优化区域、碳汇优化区域、碳平衡经济补偿区及碳平衡生态补偿区,提出相应的碳平衡优化对策。成渝城市群碳平衡存在明显的空间分异特征,四川与重庆碳平衡经济贡献系数和碳平衡生态贡献系数数值具有对立关系,成渝之间还存在生态、经济壁垒。 展开更多
关键词 碳平衡 低碳城市 空间分异 ESC ECC
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Predictive value of serum uric acid on cardiovascular disease and all-cause mortality in urban Chinese patients 被引量:11
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作者 WU Yong-quan LI Jue +10 位作者 xu yuan-xi WANG Yong-liang LUO Ying-yi HU Da-yi LIU Wei-jing YANG Ming PI Lin WANG Ming-sheng WANG Ji-yun ZHAO Shu-mei LI Mei-jing 《Chinese Medical Journal》 SCIE CAS CSCD 2010年第11期1387-1391,共5页
Background The association between increased serum uric acid (SUA) levels and cardiovascular risk has been debated for decades. Several large studies have provided conflicting results regarding the clinical signific... Background The association between increased serum uric acid (SUA) levels and cardiovascular risk has been debated for decades. Several large studies have provided conflicting results regarding the clinical significance of elevated SUA levels in cardiovascular disease (CVD) or cerebrovascular disease. The aim of this study was to investigate the relationship between SUA and CVD and all-cause mortality and their potential diagnostic value. Methods A total of 3570 in-patients ranging in age from 56 to 95 years (mean (67.36_+11.36) years) were selected from 20 hospitals in Beijing and Shanghai. A carefully designed questionnaire was used to gather baseline data of each patient All patients were divided into two main groups according to their SUA levels: high SUA and normal SUA groups. Serum indices and other important parameters were measured. Results Compared with normal SUA group, high SUA group had significant difference in systolic blood pressure (SBP), total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C), body mass index (BMI), and age (P 〈0.05 or P 〈0.01). High SUA prevailed in female and patients with history of essential hypertension, while history of smoking and diabetes showed no significant difference between two groups. All-cause and CVD mortality occurred more frequently in high SUA group than in normal SUA group. In the accumulative survival analysis, high SUA group had lower survival rate than normal SUA group both in CVD and all-cause mortality. COX regression analysis indicated that the history of smoking, age and high SUA were independent risk factors for the development of CVD. Conclusions These preliminary observations suggest that patients with high SUA levels would face higher risk of mortality. SUA measurement may be applied as a routine predictor for clinical assessment. 展开更多
关键词 serum uric acid cardiovascular disease MORTALITY
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