首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   181篇
  完全免费   16篇
  2018年   6篇
  2017年   1篇
  2016年   2篇
  2015年   5篇
  2014年   2篇
  2013年   3篇
  2012年   9篇
  2011年   9篇
  2010年   5篇
  2009年   4篇
  2008年   6篇
  2007年   8篇
  2006年   12篇
  2005年   6篇
  2004年   7篇
  2003年   6篇
  2002年   9篇
  2001年   13篇
  2000年   8篇
  1999年   6篇
  1998年   4篇
  1997年   6篇
  1996年   4篇
  1995年   4篇
  1994年   1篇
  1993年   1篇
  1992年   2篇
  1991年   5篇
  1990年   3篇
  1989年   3篇
  1988年   5篇
  1987年   1篇
  1986年   6篇
  1985年   4篇
  1984年   4篇
  1983年   2篇
  1981年   2篇
  1980年   1篇
  1979年   3篇
  1977年   2篇
  1976年   1篇
  1975年   3篇
  1973年   3篇
排序方式: 共有197条查询结果,搜索用时 78 毫秒
1.
2.
The potential role of photorespiration in the protection against salt stress was examined with transgenic rice plants. Oryza sativa L. cv. Kinuhikari was transformed with a chloroplastic glutamine synthetase (GS2) gene from rice. Each transgenic rice plant line showed a different accumulation level of GS2. A transgenic plant line, G39-2, which accumulated about 1.5-fold more GS2 than the control plant, had an increased photorespiration capacity. In another line, G241-12, GS2 was almost lost and photorespiration activity could not be detected. Fluorescence quenching analysis revealed that photorespiration could prevent the over-reduction of electron transport systems. When exposed to 150 mM NaCl for 2 weeks, the control rice plants completely lost photosystem II activity, but G39-2 plants retained more than 90% activity after the 2-week treatment, whereas G241-12 plants lost these activities within one week. In the presence of isonicotinic acid hydrazide, an inhibitor of photorespiration, G39-2 showed the same salt tolerance as the control plants. The intracellular contents of NH4 + and Na+ in the stressed plants correlated well with the levels of GS2. Thus, the enhancement of photorespiration conferred resistance to salt in rice plants. Preliminary results suggest chilling tolerance in the transformant.  相似文献
3.
An isozyme of betaine aldehyde dehydrogenase in barley.   总被引:18,自引:0,他引:18  
4.
5.
6.
7.
8.
The accumulation of betaine and the induction of betaine aldehydedehydrogenase, which catalyzes the last step in the synthesisof betaine, were analyzed in salt-stressed barley leaves. Whenhydroponically grown barley plants were transferred to a mediumthat contained 200 mM NaCl, the levels of both betaine and thetotal extractable betaine aldehyde dehydrogenase activity inthe leaves increased approximately 7-fold and 3-fold when calculatedon the basis of total leaf protein, respectively, over the courseof 7 days. Betaine aldehyde dehydrogenase activity was alsodetected in either etiolated leaves or roots of barley plantsgrown under aseptic conditions. Betaine was detected in bothetiolated leaves and roots at levels that were about 20% ofthat in green leaves when calculated on a fresh weight basis. 1 This research was supported financially by a research grantfrom the Ministry of Education, Science and Culture (63560080) (Received March 9, 1990; Accepted May 29, 1990)  相似文献
9.
10.
Betaine-aldehyde dehydrogenase was purified from spinach leaves and characterized. The molecular weight of the enzyme was estimated to be 120 kDa by a gel filtration chromatography. The enzyme was judged to consist of two identical pieces of the monomeric subunit with molecular weight of 60 kDa. A specific polyclonal antibody was raised against the enzyme subunit.  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号