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   540130篇
  免费   60556篇
  国内免费   347篇
  601033篇
  2018年   5344篇
  2017年   5185篇
  2016年   7133篇
  2015年   8986篇
  2014年   10727篇
  2013年   15604篇
  2012年   17344篇
  2011年   17765篇
  2010年   11957篇
  2009年   10952篇
  2008年   15458篇
  2007年   16009篇
  2006年   14945篇
  2005年   14320篇
  2004年   14193篇
  2003年   13510篇
  2002年   13071篇
  2001年   28493篇
  2000年   28355篇
  1999年   22127篇
  1998年   6799篇
  1997年   7389篇
  1996年   6818篇
  1995年   6278篇
  1994年   6052篇
  1993年   6027篇
  1992年   17158篇
  1991年   16376篇
  1990年   15814篇
  1989年   15300篇
  1988年   14015篇
  1987年   13037篇
  1986年   12145篇
  1985年   11920篇
  1984年   9756篇
  1983年   8164篇
  1982年   6059篇
  1981年   5445篇
  1980年   5178篇
  1979年   9014篇
  1978年   6903篇
  1977年   6353篇
  1976年   5716篇
  1975年   6297篇
  1974年   6827篇
  1973年   6622篇
  1972年   6045篇
  1971年   5495篇
  1970年   4727篇
  1969年   4456篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Biosorption is becoming an important component in the integrated approach to the treatment of aqueous effluents. The economics of biomass technical applications are improved by using waste biomass instead of purposely-produced biomass. Biomass derived from an alginate extraction industry - Sargassum sp. - was examined for its ability to function as a biosorbent for metals such as cadmium, zinc and copper. For use in column applications, biomass should be immobilized. To the algae reinforcement, the biomass was embedded in polyethleneimine (PEI), followed by glutaraldehyde crosslinking. Equilibrium Zn and Cu isotherms were analysed using the immobilization ratio that showed the best Cd performance. Either Freundlich or Langmuir models can describe the passive biosorption equilibrium of cadmium, zinc and cooper. The preference for this series of metals by the biomass was found to be Cd > Zn > Cu, with maximum uptake values of 157.8, 118.5 and 77.4 mg/g dry weight biomass for Cd, Zn and Cu. respectively. The metal binding capacity by non-living biomass is an important quality for industrial use.  相似文献   
992.
We describe the ultrastructure of type-I salivary-gland acini in two argasid and two ixodid species. The basic cell types in the agranular or type-I acini, and their associations, are very similar in argasids and ixodids; therefore, we propose an anatomical nomenclature for cells in the type-I acinus based on the adult ixodidsAmblyomma americanum andDermacentor variabilis, and the argasid adultArgas (Persicargas) arboreus and on nymphalOrnithodoros moubata. Four cell types were present in all specimens: one central lamellate cell, a variable number of peripheral lamellate cells, a variable number of peritubular cells depending on the species, and one circumlumenal cell. The lamellate cells had infolded basal plasma membranes that presented an amplified surface area to the hemolymph. These cells most likely secreted the fluid involved in water vapor uptake by ticks. ForAmblyomma americanum females, abundant K+-dependent, ouabain-sensitive Na+, K+-ATPase complexes were located on the infolded basal plasma membranes of the lamellate cells. Apical membranes of the lamellate cells, and plasma membranes of other cell types in the acinus had little or no evidence of Na+, K+-ATPase activity. Only the central lamellate cell extended from the hemolymph of the acinus to its lumen; peripheral cells did not contact the lumen. Except when the ticks were rehydrating, lipid inclusions were common features in the lamellate cells of the ixodids. Lipid inclusions were not seen in argasid type I acini; however, glycogen deposits were common. To determine if acinar cells respond to the changing hydration state of the tick, unfed femaleA. americanum were subjected to dehydration/rehydrating conditions. During rehydration, mitochondria in the lamellate cells changed from a matrix of medium electron-density and intermembrane space (orthodox configuration) to a matrix of greater density and larger intermembrane space (condensed configuration). The orthodox configuration was consistently observed in control and dehydrating ticks. The condensed configuration was the norm for mitochondria in lamellate cells of rehydrating ticks. Lipid inclusions were depleted in the rehydrating ticks compared to control or dehydrating ticks. Acini appeared to be reverting to the control or desiccated state when ticks were returned to low humidity, suggesting that these changes were cyclical. Nymphs ofO. moubata subjected to the same dehydration/rehydrating conditions showed no obvious ultrastructural changes.  相似文献   
993.
Abstract. A major objection to the convenient sampling of Chenopodiacean bladders by brushing in aqueous solutions is the suspected leakage of ions from the leaf blade. To overcome this problem, a new method of sampling bladder hair is described, which also achieves rapid and quantitative separation and, at the same time, yields bladder samples of undoubtedly high purity. Leakage is stopped by the aid of liquid nitrogen. Comparison of this method to removal of bladders by brushing in aquenous solutions effectively confirm the validity of the customary method beyond dispute.  相似文献   
994.
995.
A maize acetyl-coenzyme A carboxylase cDNA sequence.   总被引:5,自引:0,他引:5       下载免费PDF全文
  相似文献   
996.
997.
Equations for the motion of an individual dust grain in the double layer of a negatively charged cylindrical probe in a glow discharge plasma are derived and solved numerically. The distribution of the electric potential near the probe is determined, and the grain charge is calculated as a function of the distance from the probe for different probe potentials. The trajectories of grains with different initial energies are traced. An analysis of the grain trajectories shows that, at a certain distance from the probe, high-energy grains may be recharged; i.e., the grain charge may change sign. The grains are found to have no direct effect on the probe current in a dusty plasma of a glow discharge.  相似文献   
998.
999.
1000.
The tubular portion of the colleterial gland of the cecropia silkmoth secretes protein which labels extensively with glycine and appears as a single peak when separated by acrylamide gel electrophoresis. The radioactive peak does not stain with protein stains or absorb at 280 nm, but is dispersed by Pronase digestion. Synthesis of the peak is sensitive to inhibition by puromycin and cycloheximide but is not sensitive to actinomycin or chloramphenicol inhibition. Amino acid analysis revealed a composition of 30% glycine, 33% aspartic acid, and insignificant amounts of aromatic amino acids; the molecular weight was calculated to be 160,000. Autoradiographic analysis revealed that nearly all the glycine incorporated is transported from the mature secretory cells, and the half-time of secretion is calculated to be 3.4 hr. The possible use of this product as a marker for biochemical differentiation is discussed.  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