314 resultados para 21-210


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博优210是华南晚籼杂交稻的“高优”组合,1993和1994年通过省区试和大面积试种表证,1995年5月通过广东省品种委员会审定,具国内同类型品种领先水平。其主要技术经济指标:1、米质1级至特2级(达出口标准),精米率75%,正精米率71%;2、两年省区试产量名列第二位和第一位,比对照组合增产1%和2%,大田一般亩产450公斤;高产的552公斤,比主栽组合博优64增产30公斤;3、高抗稻瘟病,中抗白叶枯病,后期较耐低温;4、较早熟,全生育期118天,比主栽组合博优64早2至3天;5、制种容易,一般亩产200公斤。由于综合性状优良,而具有较高的经济效益和社会效益,种1亩博优210可增值219元,另因少施或不施农药,减少环境污染,而具有一定的生态效益。

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博优210是华南晚籼杂交稻的“高优”组合,1993和1994年通过省区试和大面积试种表证,1995年5月通过广东省品种委员会审定,具国内同类型品种领先水平。其主要技术经济指标:1、米质1级至特2级(达出口标准),精米率75%,正精米率71%;2、两年省区试产量名列第二位和第一位,比对照组合增产1%和2%,大田一般亩产450公斤;高产的552公斤,比主栽组合博优64增产30公斤;3、高抗稻瘟病,中抗白叶枯病,后期较耐低温;4、较早熟,全生育期118天,比主栽组合博优64早2至3天;5、制种容易,一般亩产200公斤。由于综合性状优良,而具有较高的经济效益和社会效益,种1亩博优210可增值219元,另因少施或不施农药,减少环境污染,而具有一定的生态效益。博优210均适宜华南各省晚稻区种植,越南亦大量引进试种。种植面积发展异常迅速,1993年3600亩,1994年10万亩,1995年约90万亩,预计1996年将超过300万亩,行家预测,博优210在“九五”期间必将成为华南晚稻主栽组合。发表在《中国水稻科学》等7篇论文,是杂交稻优质育种和优质高产育种的规律性研究结果,对杂交稻育种具有一定指导意义。成果达国内领先水平。

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About 336-444 bp mitochondrial D-loop region and tRNA gene were sequenced for 40 individuals of the giant panda which were collected from Mabian, Meigu, Yuexi, Baoxing, Pingwu, Qingchuan, Nanping and Baishuijiang, respectively. 9 haplotypes were found in 21 founders. The results showed that the giant panda has low genetic variations, and that there is no notable genetic isolation among geographical populations. The ancestor of the living giant panda population perhaps appeared in the late Pleistocene, and unfortunately, might have suffered bottle-neck attacks. Afterwards, its genetic diversity seemed to recover to same extent.

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Special thanks to Christopher Blair and Mumtaz Baig for their suggestions. This work was supported by National Basic Research Program of China (973 Program, 2007CB411600), National Natural Science Foundation of China (30621092), and Bureau of Science and Technology of Yunnan Province.

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对采自东湖 站和 站的沉积物采用210Pb和137Cs相结合的方法测定沉积速率,210Pb法测出东湖 站和 站的沉积速率为8.73mm/a和6.90mm/a,137Cs测出东湖 站和 站的沉积速率为7.4mm/a和5.8mm/a.分析了两种方法测定结果差异产生的原因,并与以往的研究相对比,探讨东湖沉积速率空间分布的规律性,沉积速率变化与人类活动的关系、沉积速率与扰动的关系.

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为探讨低光照(30 μmol·m-2·s-1)和高光照(210 μmol·m-2·s-1)条件下海水CO2浓度变化对海产硅藻中肋骨条藻(Skeletonema costatum)的生理影响,对该藻生长及其光合CO2吸收和胞外碳酸酐酶(CAext)活性进行了测定,结果表明,在低光条件下,CO2浓度变化(4~31μmol/L CO2)对该藻的生长和净光合速率的影响比高光条件大.CAext在12和31μmol/L CO2时没有检测出活性;但在4 μmol/L CO2时则有明显活性,且其高光条件下的活性是低光条件

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<正> 世界鲸类动物的人工饲养已经有100多年的历史,鲸类动物的人工饲养不但为人们提供了一种非常有趣的娱乐项目,而且为深入研究、繁殖和保护鲸类动物提供了很好的条件。我国鲸类动物的人工饲养于1965年由青岛海产博物馆从饲养江豚开始

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Sediment core samples were collected in the largest urban Lake Donghu (Stations I and II) in China, and the activities of Pb-210, Ra-226 and Cs-137 were measured by gamma-ray spectrometry. The sedimentation rates, calculated by 210Pb constant rate of supply (CRS) model, ranged from 0.11 to 0.65 (average 0.39) cm(.)y(-1) at Station I, and from 0.21 to 0.78 (average 0.46) cm(.)y(-1) at Station II. Sedimentation rate calculated by Cs-137 as a time marker was 0.55 cm(.)y(-1) at Station II. Based on the average sedimentation rate, we obtained 769 and 147 t(.)y(-1) for nitrogen and phosphorus retentions in Lake Donghu sediments, respectively.