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311.
Upland and lowland rice (Oryza sativa L.) showed different mechanisms of water stress resistance. Hydroponically grown 3-week-old seedlings of a lowland variety
IR64 and an upland variety were exposed to 15% polyethylene glycol (PEG-6000). After 7 d of treatment, IR64 maintained high
relative water content and developed a well-branched root. Therefore, IR64 had better water-deficit tolerance than Azucena
under PEG treatment. To identify water-deficit-responsive proteins associated with the tolerance differences between two ecotypes,
a comparative proteomic analysis of roots was conducted. Out of 700 proteins reproducibly detected on two-dimensional electrophoresis
gels, 65 proteins exhibited significant changes in at least one ecotype at 48 h of water deficit. Only 15 proteins showed
different responses to water deficit between the two ecotypes. Twelve proteins were identified by matrix-assisted laser desorption/ionization-time
of flight/time of flight-mass spectrometry, which involved in energy and metabolism, protein processing and degradation, detoxification
and pathogenrelated (PR) proteins, i.e. PR-1a, RSOsPR10 and JIOsPR10. All three PR proteins were induced more strongly in
IR64 than in Azucena by water deficit at both protein and mRNA level. The results suggested that PR-1a, RSOsPR10 and JIOsPR10
may play important roles in protecting root cells against water deficit in rice. 相似文献
312.
Modeling carotid and radial artery pulse pressure waveforms by curve fitting with Gaussian functions
Chengyu Liu Dingchang Zheng Alan Murray Changchun Liu 《Biomedical signal processing and control》2013,8(5):449-454
Modeling arterial pressure waveforms holds the potential for identifying physiological changes. There is a clinical need for a simple waveform analysis method with a high accuracy in reproducing the original waveforms. The aim of this study was to determine the accuracy of modeling carotid and radial pulses using Gaussian functions, making no physiological assumptions. Carotid and radial pulses were recorded from 20 normal volunteers. Ten consecutive beats from each volunteer were analyzed to determine beat-to-beat variability. Each pulse was decomposed using seven combinations of up to three Gaussian functions. The first function was always positive, but the second or third could be either positive or negative. Three positive Gaussian functions reproduced the original waveforms best with a mean absolute error (MAE) of 1.2% and 1.3% for the carotid and radial pulses respectively, and a maximum residual error of only 4.1% for both. This model had significantly smaller errors than any of the other six (all P < 0.001). Four positive Gaussian functions were then used to test the stability of this model. An insignificant change of the mean MAE (1.2% for both carotid and radial pulses) was obtained, showing that the stability has been reached with three positive Gaussian functions. The variability of MAE calculated as the standard deviation (SD) over the 10 beats was small at 0.2% for both pulses confirming the repeatability of using three positive Gaussian functions. 相似文献
313.
1989年6月,在吉林省公主岭市我们从为害旱柳Salix mat sudana Koidz枝梢的黑潜蝇Melanagromyza sp.蛹中饲养出一种斯夫金小蜂。经鉴定,该种为斯夫金小蜂属Sphegigaster一新种。模式标本保存于中国科学院动物研究所。吉林斯夫金小蜂Sphegigaster jilinensis Huang,新种(图1~6) 相似文献
314.
本文记述下盾螨属2新种:拟胸下盾螨Hypoaspis(Geolaelaps)praesternaloides,sp.nov.和带岭下盾螨Hypoaspis(Geolaelaps)dailingensis,sp.nov.。模式标本保存于吉林省白城市全国鼠疫布氏菌病防治基地。 相似文献
315.
Stiffness of photocrosslinkable gelatin hydrogel influences nucleus pulposus cell propertiesin vitro
Panpan Xu Jingjing Guan Yu Chen Hui Xiao Tianhao Yang Hengheng Sun Nan Wu Changchun Zhang Yingji Mao 《Journal of cellular and molecular medicine》2021,25(2):880-891
A key early sign of degenerative disc disease (DDD) is the loss of nucleus pulposus (NP) cells (NPCs). Accordingly, NPC transplantation is a treatment strategy for intervertebral disc (IVD) degeneration. However, in advanced DDD, due to structural damage of the IVD and scaffold mechanical properties, the transplanted cells are less viable and secrete less extracellular matrix, and thus, are unable to efficiently promote NP regeneration. In this study, we evaluated the encapsulation of NPCs in a photosensitive hydrogel made of collagen hydrolysate gelatin and methacrylate (GelMA) to improve NP regeneration. By adjusting the concentration of GelMA, we prepared hydrogels with different mechanical properties. After examining the mechanical properties, cell compatibility and tissue engineering indices of the GelMA-based hydrogels, we determined the optimal hydrogel concentration of the NPC-encapsulating GelMA hydrogel for NP regeneration as 5%. NPCs effectively combined with GelMA and proliferated. As the concentration of the GelMA hydrogel increased, the survival, proliferation and matrix deposition of the encapsulated NPCs gradually decreased, which is the opposite of NPCs grown on the surface of the hydrogel. The controllability of the GelMA hydrogels suggests that these NPC-encapsulating hydrogels are promising candidates to aid in NP tissue engineering and repairing endogenous NPCs. 相似文献
316.
R Stevanato F Momo M Marian M P Rigobello A Bindoli M Bragadin E Vincenti G Scutari 《Nitric oxide》2001,5(2):158-165
Isolated rat liver mitochondria have been treated with the general anaesthetic propofol (2,6-diisopropylphenol, 200 microM) and the physiological NO donor nitrosoglutathione (GSNO, 200 or 250 microM). The efficiency of the oxidative phosphorylation has been evaluated by measuring the respiration and ATP synthesis rates and the behavior of transmembrane electrical potential. In mitochondria energized by succinate, the simultaneous presence of both propofol and GSNO gives rise to a synergic action in affecting the resting and the ADP-stimulated respiration, the respiratory control ratio, the ATP synthesis, and the formation and utilization of the electrochemical transmembrane potential. 相似文献
317.
Qingshuai Xu Jiajin Lin Changchun Ye Xiaojing Jin Daiqi Ye Yingying Lu Guangmin Zhou Yongcai Qiu Weishan Li 《Liver Transplantation》2020,10(6)
Li metal is an ideal anode material for rechargeable high energy density batteries, but its sensitivity to humid air and uncontrolled dendrite growth limit its practical applications. A novel hybrid interphase is fabricated to address these issues. This interphase consists of dense fullerene (C60) and magnesium metal bilayers, which are deposited successively on lithium foil by vacuum evaporation deposition and contribute to moisture resistance and lithium dendrite suppression. Thanks to this dual‐functional feature, the assembled cells with the modified anodes and commercial LiFePO4 cathodes exhibit long cycle life (>200 cycles) with high capacity retention (>98.5%). Moreover, even the modified anodes that are exposed to humid air (30% relative humidity) for over 12 h; the cells still deliver excellent performance, comparable to those without exposure. Such a unique hybrid interphase provides a new promising method for fabricating air‐stable and dendrite‐free lithium metal batteries. 相似文献
318.
319.
M Scarpa P Viglino F Momo F Bracco L Battistin A Rigo 《Journal of biochemical and biophysical methods》1991,22(2):135-144
A method for copper- and manganese-containing superoxide dismutase (Cu- and MnSOD) assay in tissue homogenates such as liver and brain, based on the measurement of the longitudinal nuclear relaxation time (T1) of F-, has been developed as a preliminary approach to in vivo measurement of these enzymes. The relaxation rate of F-, which increases linearly with the SOD concentration, also depends on the oxidation state of the metal ion present in the active site of the enzyme. The relaxivity values of the oxidized, reduced and turnovering CuSOD were found to be 9.6 x 10(6), much less than 1 x 10(2) and 5.2 x 10(6) M-1 s-1, respectively, while for MnSOD the corresponding values were 2.9 x 10(6), 4.2 x 10(6) and 3.6 x 10(6) M-1 s-1, respectively. These high relaxivity values allow the detection of SODs in brain and liver homogenates where, under aerobic conditions, these enzymes appear in the steady-state. The contribution of the two types of SOD to the F- relaxation rate in the homogenates was measured by addition of either diethyldithiocarbamate or cyanide, both of which selectively inhibit the CuSOD. The comparison between NMR and activity data confirmed the possibility of carrying out accurate and precise measurements of SODs in homogenates by NMR. 相似文献