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Ozone (O3) is damaging to plants, inducing signalling pathways involving antagonism between jasmonates and ethylene. These pathways mediate O3 responses, particularly to acute exposure, and their manipulation protected several species against acute and chronic O3. We use chronic daily exposure of up to 163 ppb O3, and twice weekly application of up to 320 µg plant?1 methyl jasmonate (MeJA) to test two hypothesizes: 1) a low rate of MeJA does not affect growth but increases O3 sensitivity; 2) a high rate inhibits growth but reduces O3 sensitivity. Both hypotheses were rejected. Growth declined with increases in both MeJA and O3. MeJA at 40 µg plant?1 caused no direct effect, and at 160 µg plant?1 reduced growth similarly at all O3. Neither rate altered O3 sensitivity. These additive responses are not consistent with protection by MeJA in this system. They may reflect inter‐specific differences in signalling, since O3 concentrations used here exceeded some reported acute exposures. Alternatively, parallel responses to O3 and MeJA may suggest that O3‐induced jasmonates play a developmental role in chronic response but no protective role in the absence of lesions characteristic of acute exposure. MeJA appears useful as a probe of these mechanisms. 相似文献
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Giang Ngan Khong Nhu Thi Le Mai Thi Pham Helene Adam Carole Gauron Hoa Quang Le Dung Tien Pham Kelly Colonges Xuan Hoi Pham Vinh Nang Do Michel Lebrun Stefan Jouannic 《PLoS genetics》2021,17(6)
The number of grains per panicle is an important yield-related trait in cereals which depends in part on panicle branching complexity. One component of this complexity is the number of secondary branches per panicle. Previously, a GWAS site associated with secondary branch and spikelet numbers per panicle in rice was identified. Here we combined gene capture, bi-parental genetic population analysis, expression profiling and transgenic approaches in order to investigate the functional significance of a cluster of 6 ANK and ANK-TPR genes within the QTL. Four of the ANK and ANK-TPR genes present a differential expression associated with panicle secondary branch number in contrasted accessions. These differential expression patterns correlate in the different alleles of these genes with specific deletions of potential cis-regulatory sequences in their promoters. Two of these genes were confirmed through functional analysis as playing a role in the control of panicle architecture. Our findings indicate that secondary branching diversity in the rice panicle is governed in part by differentially expressed genes within this cluster encoding ANK and ANK-TPR domain proteins that may act as positive or negative regulators of panicle meristem’s identity transition from indeterminate to determinate state. 相似文献
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Intermembrane linkage mediated by tubulin 总被引:2,自引:0,他引:2
P Vassilev M Kanazirska H T Tien 《Biochemical and biophysical research communications》1985,126(1):559-565
Two membranes from brain lipids were formed in the presence of brain tubulin and their electrical potentials were simultaneously measured. When electrical pulses were applied across one of them, displacements of the potential of the other membrane were found even when the membranes were not in contact. This effect was observed only in the presence of polymerized tubulin. It was not found in the presence of depolymerized tubulin or in other control experiments. The findings suggest that the microtubule fiber networks may serve as an interconnecting system between membranes or membrane bounded compartments. 相似文献
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Ca2+ channels from brain microsomal membranes reconstituted in patch-clamped bilayers 总被引:1,自引:0,他引:1
Single Ca2+ channels from brain microsomal membranes were reconstituted in bilayers made at the tips of patch-clamp micropipettes. The single-channel conductance was defined to be 107 pS in 50 mM Ca2+. The channel activity was stimulated by nucleotides and inositol 1,4,5-trisphosphate (Ins-P3), and was inhibited by ruthenium red. Na+ added asymmetrically to the membrane bilayer induced an increase in the Ca2+-channel activity. The described characteristics of these Ca2+ channels suggest that they may be responsible for the Ca2+ transport across the membranes of the endoplasmic reticulum system triggering and modulating various neurosecretory and excitatory processes in nerve cells. 相似文献
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Sensitive and High Resolution Localization and Tracking of Membrane Proteins in Live Cells with BRET
Tien‐Hung Lan Qiuju Liu Chunman Li Guangyu Wu Nevin A. Lambert 《Traffic (Copenhagen, Denmark)》2012,13(11):1450-1456
Peripheral and integral membrane proteins can be located in several different subcellular compartments, and it is often necessary to determine the location of such proteins or to track their movement in living cells. Image‐based colocalization of labeled membrane proteins and compartment markers is frequently used for this purpose, but this method is limited in terms of throughput and resolution. Here we show that bioluminescence resonance energy transfer (BRET) between membrane proteins of interest and compartment‐targeted BRET partners can report subcellular location and movement of membrane proteins in live cells. The sensitivity of the method is sufficient to localize a few hundred protein copies per cell. The spatial resolution can be sufficient to determine membrane topology, and the temporal resolution is sufficient to track changes that occur in less than 1 second. BRET requires little user intervention, and is thus amenable to large‐scale experimental designs with standard instruments. 相似文献
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Yin-Kai Chen Hsin-An Hou Jih-Luh Tang Jie-Yang Jhuang Yan-Jun Lai Ming-Cheng Lee Yuan-Yeh Kuo Wen-Chien Chou Chieh-Yu Liu Chung-Wu Lin Shih-Sung Chuang Chien-Yuan Chen Mei-Hsuan Tseng Chi-Fei Huang Ying-Chieh Chiang Fen-Yu Lee Ming-Chih Liu Chia-Wen Liu Ming Yao Shang-Yi Huang Bor-Sheng Ko Szu-Chun Hsu Shang-Ju Wu Woei Tsay Yao-Chang Chen Hwei-Fang Tien 《PloS one》2015,10(3)