全文获取类型
收费全文 | 14064篇 |
免费 | 347篇 |
国内免费 | 603篇 |
专业分类
系统科学 | 46篇 |
丛书文集 | 660篇 |
教育与普及 | 846篇 |
理论与方法论 | 98篇 |
现状及发展 | 115篇 |
研究方法 | 1篇 |
综合类 | 13248篇 |
出版年
2024年 | 77篇 |
2023年 | 244篇 |
2022年 | 255篇 |
2021年 | 279篇 |
2020年 | 212篇 |
2019年 | 248篇 |
2018年 | 111篇 |
2017年 | 181篇 |
2016年 | 216篇 |
2015年 | 314篇 |
2014年 | 561篇 |
2013年 | 500篇 |
2012年 | 569篇 |
2011年 | 609篇 |
2010年 | 581篇 |
2009年 | 724篇 |
2008年 | 766篇 |
2007年 | 674篇 |
2006年 | 581篇 |
2005年 | 651篇 |
2004年 | 505篇 |
2003年 | 566篇 |
2002年 | 534篇 |
2001年 | 597篇 |
2000年 | 521篇 |
1999年 | 501篇 |
1998年 | 430篇 |
1997年 | 447篇 |
1996年 | 414篇 |
1995年 | 388篇 |
1994年 | 350篇 |
1993年 | 283篇 |
1992年 | 287篇 |
1991年 | 225篇 |
1990年 | 219篇 |
1989年 | 226篇 |
1988年 | 82篇 |
1987年 | 49篇 |
1986年 | 24篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1932年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
锰浸种对大豆幼苗膜脂过氧化和体内保护系统的影响 总被引:10,自引:1,他引:9
以2个大豆(Glycine max Merrill)品种(“浙春2号”,“浙春3号”)为材料,设置不同的锰水平,研究了大豆种子萌发和幼苗生长期中各种生理特征的变化规律.结果表明,锰浸种对大豆种子的萌发率影响不大;但在幼苗生长期,适量锰(w(Mn^2 /种子)=O.001~O.1mg/kg)浸种使大豆叶片的质膜透性(MP)降低,脯氨酸(Pro)含量降低,超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的活性升高.说明适量的锰浸种对大豆的生长十分有利。 相似文献
973.
Iron in surface seawater has been demonstrated to be the limiting nutrient factor for primary productivity in certain oceanic regions where other major nutrients are abundant[1—5]. The available Fe to the phytoplankton in seawater is related to the uptake of carbon dioxide through the ocean and, in turn, to the global greenhouse effect[6—11]. Recent reports showed that the available Fe in the seawater is closely correlative to nitrogen fixation in the ocean[12—17]. Understanding which Fe s… 相似文献
974.
BAIYong GONGWei LIUTianyun ZHUYuxian 《科学通报(英文版)》2003,48(20):2221-2225
Cinnamoyl CoA reductase (CCR: EC 1.2.1.44),the entry-point enzyme of the llgnin specific biosynthetic pathway, catalyzes the conversion of cinnamoyl CoA esters to their corresponding dnnamaldehydes. Multiple sequence alignment showed that the deduced polypeptide shared 70% similarity and 30% sequence identity at the amino acid level with defined CCR genes from other plant species and they all contain the common signature sequences thought to be the catalytic site as well as the putative NADP binding domain.Using a conserved OsCCR cDNA fragment as the probe for library screening, we isolated the genomic DNA that covered the whole coding region of OsCCR with total length of 3045bp including 4 introns and 5 exons. The open reading frame for our OsCCR gene coBtAin~ 337 amino adds. Northern blot indicated that OsCCR was expressed in different organs with the highest level found in stems. In situ hybridization results showed that OsCCR mRNA was localized mainly along the vascular bundles in stems and leaves, and also in lateral roots that was differentiating from the tiilering node. We conclude that the vascular-localized expression of OsCCR gene may suggest its possible involvement in llgnin biosynthesis. Cloning and characterization of OsCCR will help to clarify how llgniflcations in plants are regulated and will provide a physical basis for creating genetically engineered rice plants with optimal lignin contents. 相似文献
975.
J. J. Benattar 《科学通报(英文版)》2003,48(17):1800-1802
When the thickness of soap foam film varies in adefinite region, color changes of a soap bubble will be observed due to the interference of light. Black soap films are the final stages of thinning of soap films due to the drainage of water in the absence of evaporation and are generally formed from solutions of an ionic surfactant in the presence of salt. After a bubble is formed, in the beginning the soap film is relatively thick and it appearswhite; then the film thins gradually and finally … 相似文献
976.
DING Bin WANG Hongmei YI Long CHENG Peng LI Licun ZHAI Yuping LIAO Daizheng YAN Shiping & JIANG Zonghui Department of Chemistry Nankai University Tianjin China Correspondence should be addressed to Cheng Peng or Liao Daizheng 《科学通报(英文版)》2003,48(22):2446-2449
Spin-crossover complexes are of great interest to the scientists because of their potential application in molecular-based electronic devices. Some octahedral metal compounds with 3dn (4 ≤ n ≤ 7) configuration can induce a spin state conversion through a fine tuning condition (temperature, pressure, light irradiation, etc.). If the conversion occurs reversibly with a hystersis loop and color change, it will make the system possessing memory effect. The memory effect can be magnified and the … 相似文献
977.
DINGJie ZHUTong 《科学通报(英文版)》2003,48(21):2267-2276
Fine particles play an important role in the atmosphere. Research on heterogeneous reactions on the surface of fine particles is one of the frontier areas of atmospheric science. In this paper, physical and chemical characteristics of fine particles in the atmosphere and the interactions between trace gases and fine particles are described, methods used in heterogeneous reactions research are discussed in detail, progress in the study of heterogeneous reactions on the surface of fine particles in the atmosphere is summarized, existing important questions are pointed out and future research directions are suggested. 相似文献
978.
黑洞熵公式的简单推导 总被引:4,自引:3,他引:1
Black hole is
treated as 2-D membrane. Starting from the usual state equation of thermal radiation, the
black hole entropy is technically computed, and the result that is proportional to the
area of horizon is briefly obtained. 相似文献
979.
含氢类金刚石膜(diamond-like carbon, DLC)的超低摩擦特性与其沉积制备过程密切相关. 采用分子动力学模拟的方法, 计算了以CH3基团为沉积物, 在多种不同入射能下制备含氢DLC膜的动力学过程. 通过沉积原子数统计分析、薄膜密度和sp杂化分析考察了含氢DLC膜的结构特性. 通过比较模拟结果, 发现随着入射轰击能量的增加, 含氢类金刚石膜中碳的含量总体上呈现增加的趋势; 在含氢DLC膜中所沉积的氢原子数存在峰值, 峰值前后变化趋势相反, 大于80 eV以后趋于饱和与稳定, 薄膜相对密度也随之增加, 达到50 eV时趋于稳定值; 膜中碳原子比氢原子具有更强的成键能力, 易与基底发生化学吸附; 沉积源基团的氢含量决定生长成膜以后的薄膜氢含量, 沉积源基团中的氢含量高, 则所生长薄膜的氢含量高. 相似文献