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   1302篇
  免费   28篇
  国内免费   1篇
  1331篇
  2024年   12篇
  2023年   18篇
  2022年   20篇
  2021年   60篇
  2020年   40篇
  2019年   60篇
  2018年   52篇
  2017年   58篇
  2016年   61篇
  2015年   95篇
  2014年   108篇
  2013年   104篇
  2012年   109篇
  2011年   98篇
  2010年   65篇
  2009年   53篇
  2008年   56篇
  2007年   50篇
  2006年   28篇
  2005年   35篇
  2004年   33篇
  2003年   26篇
  2002年   15篇
  2001年   6篇
  2000年   5篇
  1999年   4篇
  1998年   7篇
  1995年   4篇
  1992年   6篇
  1991年   1篇
  1990年   4篇
  1989年   2篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   4篇
  1983年   2篇
  1981年   2篇
  1980年   1篇
  1978年   1篇
  1977年   3篇
  1976年   2篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1972年   1篇
  1967年   1篇
  1962年   2篇
  1961年   2篇
  1960年   4篇
排序方式: 共有1331条查询结果,搜索用时 0 毫秒
1.
Trichoderma species conidiate in response to blue light, however, unlike in the blue-light model fungus Neurospora crassa, conidiation in Trichoderma spp. has been considered to be non-circadian. In this study we uncovered evidence for circadian conidiation in Trichoderma pleuroticola and identified orthologues of the key N. crassa clock components, wc-1 (blr-1) and frq.  相似文献   
2.
Evidence of fungal activity expressed as typical decay patterns is described from silicified podocarpaceous wood from the Eocene of Patagonia, Argentina. Decay features consist of tracheids of the secondary xylem that are degraded, resulting in thin-celled, lignin-free, translucent, circular to elliptical areas, some of which have cells devoid of all cell wall components including lignin, hemicellulose, and cellulose, and other areas that show only partial simultaneous decay of all cell wall layers. These patterns conform to the white rot and its variant white pocket rot decay patterns produced by basidiomycetes and ascomycetes in gymnosperm and angiosperm wood in modern terrestrial ecosystems. Coagulated opaque bodies in the lumen of some cells and enlarged secondary walls may represent host reactions to infection or remains of metabolic products of fungal enzymatic activity. Similar decay patterns and reaction features have been described from fossil woods ranging in age from the Devonian to the present. This record expands the fossil record of wood rot fungi and underscores their importance as drivers of biological cycles in ancient terrestrial ecosystems.  相似文献   
3.
    
The evolutionary integration of complex morphological structures is a macroevolutionary pattern in which morphogenetic components evolve in a coordinated fashion, which can result from the interplay among processes of developmental, genetic integration, and different types of selection. We tested hypotheses of ecological versus developmental factors underlying patterns of within‐species and evolutionary integration in the mandible of phyllostomid bats, during the most impressive ecological and morphological radiation among mammals. Shape variation of mandibular morphogenetic components was associated with diet, and the transition of integration patterns from developmental to within‐species to evolutionary was examined. Within‐species (as a proxy to genetic) integration in different lineages resembled developmental integration regardless of diet specialization, however, evolutionary integration patterns reflected selection in different mandibular components. For dietary specializations requiring extensive functional changes in mastication patterns or biting, such as frugivores and sanguivores, the evolutionary integration pattern was not associated with expected within‐species or developmental integration. On the other hand, specializations with lower mastication demands or without major functional reorganization (such as nectarivores and carnivores), presented evolutionary integration patterns similar to the expected developmental pattern. These results show that evolutionary integration patterns are largely a result of independent selection on specific components regardless of developmental modules.  相似文献   
4.
The p25 coat protein (CP) gene of Citrustristezavirus (CTV) was incorporated to Mexican lime plants and forty-twotransgeniclines were produced, 25 containing the p25 CP gene of thesevere CTV strain T-305 and 17 with that of the mild strain T-317. When plantspropagated from each transgenic line were graft-inoculated with CTV T-305 oraphidinoculated with T-300, two types of response to viral challenge wereobserved: some lines developed CTV symptoms similar to those of non-transgeniccontrols, whereas others exhibited protection against the virus. Thisprotectionconsisted of a proportion of plants, ranging from 10 to 33%, that wereresistantto CTV, and the rest of them that showed a significant delay in virusaccumulation and symptom onset. Protection was efficient against non-homologousCTV strains and was generally accompanied by high accumulation of p25 CP in theprotected lines, which suggest a CP-mediated protection mechanism in mostcases.This is the first report demonstrating pathogen-derived resistance intransgenicplants against a Closterovirus member in its natural host.  相似文献   
5.
6.
Molecular Biology Reports - Small auxin-up RNA (SAUR) genes form a wide family supposedly involved in different physiological and developmental processes in plants such as leaf senescence, auxin...  相似文献   
7.
Plant Cell, Tissue and Organ Culture (PCTOC) - The employment of biotechnology-based approaches such as somatic embryogenesis has been applied to several plants including Coffea sp. Despite the...  相似文献   
8.
9.
  总被引:1,自引:0,他引:1  
  相似文献   
10.
To1, previously named Tc49b, is a peptide neurotoxin isolated from venom of the scorpion Tityus obscurus that is responsible for lethal human poisoning cases in the Brazilian Amazonian region. Previously, To1 was shown to be lethal to mice and to change Na+ permeation in cerebellum granular neurons from rat brain. In addition, To1 did not affect Shaker B K+ channels. Based on sequence similarities, To1 was described as a β-toxin. In the present work, To1 was purified from T. obscurus venom and submitted to an electrophysiological characterization in human and invertebrate NaV channels. The analysis of the electrophysiological experiments reveal that To1 enhances the open probability at more negative potentials of human NaV 1.3 and 1.6, of the insect channel BgNaV1 and of arachnid VdNaV1 channel. In addition, To1 reduces the peak of Na+ currents in some of the NaVs tested. These results support the classification of the To1 as a β-toxin. A structure and functional comparison to other β-toxins that share sequence similarity to To1 is also presented.  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