Over the past seven decades, the grain yield of maize(Zea mays L.) has increased continuously in China, mostly due to hybridization innovations, particularly recent genetic improvements in photosynthesis. In order to ...Over the past seven decades, the grain yield of maize(Zea mays L.) has increased continuously in China, mostly due to hybridization innovations, particularly recent genetic improvements in photosynthesis. In order to reveal photosynthetic characters of elite inbred lines in different ears, a field experiment was conducted at the North China Plain of Shandong Province in China. Six parental lines of maize introduced in three eras(the 1960 s, 1980 s, and 2000 s) were investigated diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response characteristic at the grain filling stage. Compared to earlier parental lines, the 2000 s parental lines always had higher net photosynthetic rate(Pn) throughout the day, especially at noon, and a mid-day depression in Pn did not occur in all hybrids parental lines. Moreover, the stomatal conductance(Gs) and water use efficiency(WUE) of the 2000 s’ lines showed higher value than those of the 1960 s’ and 1980 s’ lines. The inbred lines differences in photosynthetic parameters were partly owing to their different quantum carboxylation efficiencies and light synthase activities. Simultaneously, the 2000 s parental lines exhibited lower light and CO2 compensation points, and their higher apparent quantum yield, and carboxylation efficiency. These suggested that the modern parental lines required lower light intensity and less CO2 to maintain a relatively high photosynthetic capacity, substantially increasing leaf physical quality and stress resistance. It provided crucial information of high photo-efficiency and stress-resistance breeding in maize.展开更多
This paper reports the synthesis and general properties of the new reagent CPFP. Its dissociation constants have been determined. The characterization in determinating total RE with CPAP reagent has been investigated ...This paper reports the synthesis and general properties of the new reagent CPFP. Its dissociation constants have been determined. The characterization in determinating total RE with CPAP reagent has been investigated in detail. Analytic data for synthetic sample are satisfactory.展开更多
目的对比研究经腹入路和后腹腔入路腹腔镜下肾部分切除术治疗R.E.N.A.L.评分≥7的肾肿瘤的安全性和可行性,评价手术疗效,对比研究其临床应用价值。方法收集2012年1月至2014年3月R.E.N.A.L.评分≥7的肾肿瘤行经腹入路(32例,经腹组)和后...目的对比研究经腹入路和后腹腔入路腹腔镜下肾部分切除术治疗R.E.N.A.L.评分≥7的肾肿瘤的安全性和可行性,评价手术疗效,对比研究其临床应用价值。方法收集2012年1月至2014年3月R.E.N.A.L.评分≥7的肾肿瘤行经腹入路(32例,经腹组)和后腹腔入路(30例,后腹腔组)腹腔镜下肾部分切除术患者临床资料,观察和记录手术相关参数、术后情况,评价手术疗效,记录并发症,所有患者常规随访。比较两种手术方法的手术时间、术中估计失血量、热缺血时间、术中并发症、输血率、恢复进食时间、住院时间、切缘阳性率等。结果经腹组1例患者转为开放手术,后腹腔组3例转为开放手术,其余患者手术均顺利完成,两组手术在年龄、体重指数、ASA评分,Charlson并发症指数、肿瘤最大径、肾肿瘤R.E.N.A.L评分等方面差异无统计学意义(P>0.05));两组在术中估计失血量、热缺血时间、术中并发症、输血率、切缘阳性率等方面差异无统计学意义(P>0.05);经腹组手术时间较后腹腔组时间较短(210.4±59.2 min vs 252±58.3 min),两者差异有统计学意义(P>0.05)。经腹组恢复进食时间(47±10 h vs 23±6 h)和住院时间(8.4±1.9 d vs 6.5±1.6 d)较后腹腔组时间较长(P<0.05)。结论两种手术入路腹腔镜下肾部分切除术均是治疗R.E.N.A.L.评分≥7的一种安全有效的方法。经腹入路操作空间大,容易暴露和手术操作;腹膜后入路术后恢复较快。展开更多
基金funded by the National Key Research and Development Program of China (2016YFD0300103)the earmarked fund for China Agriculture Research System (CARS-02-12)
文摘Over the past seven decades, the grain yield of maize(Zea mays L.) has increased continuously in China, mostly due to hybridization innovations, particularly recent genetic improvements in photosynthesis. In order to reveal photosynthetic characters of elite inbred lines in different ears, a field experiment was conducted at the North China Plain of Shandong Province in China. Six parental lines of maize introduced in three eras(the 1960 s, 1980 s, and 2000 s) were investigated diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response characteristic at the grain filling stage. Compared to earlier parental lines, the 2000 s parental lines always had higher net photosynthetic rate(Pn) throughout the day, especially at noon, and a mid-day depression in Pn did not occur in all hybrids parental lines. Moreover, the stomatal conductance(Gs) and water use efficiency(WUE) of the 2000 s’ lines showed higher value than those of the 1960 s’ and 1980 s’ lines. The inbred lines differences in photosynthetic parameters were partly owing to their different quantum carboxylation efficiencies and light synthase activities. Simultaneously, the 2000 s parental lines exhibited lower light and CO2 compensation points, and their higher apparent quantum yield, and carboxylation efficiency. These suggested that the modern parental lines required lower light intensity and less CO2 to maintain a relatively high photosynthetic capacity, substantially increasing leaf physical quality and stress resistance. It provided crucial information of high photo-efficiency and stress-resistance breeding in maize.
文摘This paper reports the synthesis and general properties of the new reagent CPFP. Its dissociation constants have been determined. The characterization in determinating total RE with CPAP reagent has been investigated in detail. Analytic data for synthetic sample are satisfactory.
文摘目的对比研究经腹入路和后腹腔入路腹腔镜下肾部分切除术治疗R.E.N.A.L.评分≥7的肾肿瘤的安全性和可行性,评价手术疗效,对比研究其临床应用价值。方法收集2012年1月至2014年3月R.E.N.A.L.评分≥7的肾肿瘤行经腹入路(32例,经腹组)和后腹腔入路(30例,后腹腔组)腹腔镜下肾部分切除术患者临床资料,观察和记录手术相关参数、术后情况,评价手术疗效,记录并发症,所有患者常规随访。比较两种手术方法的手术时间、术中估计失血量、热缺血时间、术中并发症、输血率、恢复进食时间、住院时间、切缘阳性率等。结果经腹组1例患者转为开放手术,后腹腔组3例转为开放手术,其余患者手术均顺利完成,两组手术在年龄、体重指数、ASA评分,Charlson并发症指数、肿瘤最大径、肾肿瘤R.E.N.A.L评分等方面差异无统计学意义(P>0.05));两组在术中估计失血量、热缺血时间、术中并发症、输血率、切缘阳性率等方面差异无统计学意义(P>0.05);经腹组手术时间较后腹腔组时间较短(210.4±59.2 min vs 252±58.3 min),两者差异有统计学意义(P>0.05)。经腹组恢复进食时间(47±10 h vs 23±6 h)和住院时间(8.4±1.9 d vs 6.5±1.6 d)较后腹腔组时间较长(P<0.05)。结论两种手术入路腹腔镜下肾部分切除术均是治疗R.E.N.A.L.评分≥7的一种安全有效的方法。经腹入路操作空间大,容易暴露和手术操作;腹膜后入路术后恢复较快。
