全文获取类型
收费全文 | 328篇 |
免费 | 15篇 |
国内免费 | 1篇 |
出版年
2023年 | 7篇 |
2022年 | 9篇 |
2021年 | 19篇 |
2020年 | 15篇 |
2019年 | 14篇 |
2018年 | 20篇 |
2017年 | 14篇 |
2016年 | 16篇 |
2015年 | 16篇 |
2014年 | 18篇 |
2013年 | 20篇 |
2012年 | 25篇 |
2011年 | 25篇 |
2010年 | 17篇 |
2009年 | 12篇 |
2008年 | 12篇 |
2007年 | 13篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有344条查询结果,搜索用时 312 毫秒
341.
342.
Shahzad Kashif Zhang Xuexian Zhang Meng Guo Liping Qi Tingxiang Tang Huini Wang Hailin Mubeen Iqra Qiao Xiuqin Peng Renhai Wu Jianyong Xing Chaozhu 《Functional & integrative genomics》2022,22(5):757-768
Functional & Integrative Genomics - Hybridization is useful to enhance the yield potential of agronomic crops in the world. Cotton has genome doubling due to the allotetraploid process and... 相似文献
343.
Pterocarpus marsupium (Bijasal) is a valuable multipurpose forest tree. The regeneration rate in natural habitat is low and the tree is overexploited.
An in vitro propagation protocol has been developed from nodal explants obtained from in vitro raised 18-day-old axenic seedlings.
The highest shoot regeneration frequency (85%), maximum number of multiple shoots (8.6) as well as length (4.8 cm) were induced
from nodal explants on Murashige and Skoog (MS) medium amended with 4.0 μM 6-benzyladenine (BA), 0.5 μM indole-3-acetic acid
(IAA) and 20 μM adenine sulphate (AdS). The percentage of shoot multiplication as well as the number of shoots per node remained
the same during the first two subculture, afterwards a decline was recorded. Rooting was best induced in microshoots excised
from proliferated shoot cultures on semisolid hormone-free half-strength MS medium, after a pulse (dip) treatment for 7 days
in half-strength MS liquid medium containing 100 μM indole-3-butyric acid (IBA) and 15.84 μM phloroglucinol (PG). The in vitro-raised
plantlets were potted and acclimatized under culture room conditions for 4 weeks before their transfer to a greenhouse, where
the established plants showed 75% survival. 相似文献
344.
F. R. SCARANO FLS H. M. DUARTE G. RÔÇAS S. M. B. BARRETO E. F. AMADO F. REINERT T. WENDT A. MANTOVANI H. R. P. LIMA C. F. BARROS 《Botanical journal of the Linnean Society. Linnean Society of London》2002,140(4):391-401
The clonal tank-bromeliad Aechmea bromeliifolia (Rudge) Baker was found in four different habitats in a restinga (vegetation mosaic on sandy coastal plains), of south-eastern Brazil. These habitats (swamp forest, dry forest, dry shrubland and herbaceous marsh) lie within a few hundred metres of each other along a gradient extending inland from the coast, and differ markedly in terms of light and flood regime. We compared ramet morphology, leaf anatomy and physiology, and population parameters to examine the amplitude of trait variation of this widespread species in the studied restinga. This integrated approach allowed us to examine which variation conferred acclimation and which was merely a stress symptom. A . bromeliifolia showed site-specific differences in abundance, distribution, rosette size and shape, leaf anatomical arrangement and photochemical efficiency (potential quantum yield; F v / F m ) during the day. Most of the variation found seemed to be related to the interaction of light and flooding. The lowest number and size of ramets at the exposed, dry shrubland was matched by a marked leaf photoinhibition, which suggested poor acclimation to local levels of light intensity and limited water supply. In the other habitats, the morpho-physiological parameters measured suggested adequate foraging behaviour and site acclimation. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 2002, 140 , 391-401. 相似文献