全文获取类型
收费全文 | 16925篇 |
免费 | 1606篇 |
国内免费 | 2314篇 |
出版年
2024年 | 26篇 |
2023年 | 269篇 |
2022年 | 410篇 |
2021年 | 1038篇 |
2020年 | 774篇 |
2019年 | 937篇 |
2018年 | 823篇 |
2017年 | 617篇 |
2016年 | 772篇 |
2015年 | 1133篇 |
2014年 | 1388篇 |
2013年 | 1367篇 |
2012年 | 1657篇 |
2011年 | 1550篇 |
2010年 | 967篇 |
2009年 | 836篇 |
2008年 | 965篇 |
2007年 | 816篇 |
2006年 | 704篇 |
2005年 | 627篇 |
2004年 | 571篇 |
2003年 | 532篇 |
2002年 | 461篇 |
2001年 | 251篇 |
2000年 | 243篇 |
1999年 | 194篇 |
1998年 | 158篇 |
1997年 | 112篇 |
1996年 | 89篇 |
1995年 | 95篇 |
1994年 | 81篇 |
1993年 | 65篇 |
1992年 | 52篇 |
1991年 | 35篇 |
1990年 | 42篇 |
1989年 | 45篇 |
1988年 | 24篇 |
1987年 | 13篇 |
1986年 | 15篇 |
1985年 | 20篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1976年 | 3篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1968年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
Scavenging effect of extracts of green tea and natural antioxidants on active oxygen radicals 总被引:14,自引:0,他引:14
With the use of the spin trapping methods, the scavenging effects of the extracts of green tea and other natural foods are studied. In stimulated polymorphonuclear leukocytes (PMN) system, water extract fraction 6 (F6) from green tea and green tea polyphenols (GTP) have the strongest scavenging effect on the active oxygen radicals, much stronger than vitamin C (Vc) and vitamin E (VE). Rosemary antioxidants (RA) and Curcumin (Cur) have weaker scavenging effects than Vc, but stronger than VE. In Fenton Reaction, Cur has the strongest scavenging effect (69%) on hydroxyl radicals. In irradiation, riboflavin system F6(74%) and GTP(72%) have very strong scavenging effects that are weaker than Vc, but much stronger than VE (23%). With the use of spin probe oxymetry, the oxygen consumption in respiratory burst of stimulated PMN were measured when the antioxidants existed in these systems. The results demonstrated that these antioxidants did not affect the respiratory burst of human polymorphonuclear leukocytes stimulated with PMA. 相似文献
32.
Changing frequency of interim analysis in sequential monitoring 总被引:1,自引:0,他引:1
In clinical trial data monitoring, one can either introduce a discrete sequential boundary for a set of specified decision times or adopt a use function and then derive the boundary when data are monitored. If the use function approach is employed, one can adjust the frequency of data monitoring as long as the decision is not data-dependent. However, if the frequency of future data monitoring is affected by the observed data, then the probability of Type I error will no longer be preserved exactly. But the effect on the significance level and power is very small, perhaps negligible, as indicated by simulation results. 相似文献
33.
W. John Albery Anthony E.G. Cass Bernard P. Mangold Zhi Xin Shu 《Biosensors & bioelectronics》1990,5(5)
It is shown that an inhibited enzyme electrode, using cytochrome oxidase, will respond to H2S, HCN and azide ion. For all three inhibitors the kinetics of the inhibition and recovery processes have been analysed using the theoretical model presented previously (Albery et al., 1990a). Rearrangement of the differential equation describing inhibition and the development of the necessary software has enabled us to obtain values of the concentration of inhibitor in a matter of seconds after exposure of the sensor. The sensor will measure concentrations of H2S down to 1 ppm in the gas phase and concentrations of HCN and azide ion down to 0·4 μmol dm−3 in the solution 相似文献
34.
35.
Evidence is presented that in the R and P genomes (Secale cereale andAgropyron cristatum, respectively) of theTriticeae there exist closely related 350-family DNA sequences in the terminal heterochromatin. This observation is compared to the relationships between these two genomes derived from a comparison of theNor and5 S DNA loci as well as the available data on morphological characters, chromosome pairing, and isozyme studies. It is concluded that the R and P genomes are not closely related and that the common presence of very similar 350-family DNA sequences reflects the parallel amplification of this family of DNA sequences. 相似文献
36.
G. J. Scoles B. S. Gill Z. -Y. Xin B. C. Clarke C. L. McIntyre C. Chapman R. Appels 《Plant Systematics and Evolution》1988,160(1-2):105-122
The 5 S DNA units from 15 grasses in theTriticeae were analysed at the DNA sequence level. Four units carried duplications near the 3-end of the 5 S RNA gene with 3 of the duplications centred on the same base pairs as a duplication previously reported byGerlach & Dyer. The fourth duplication was located 3 downstream from the gene, in the spacer region. Apparent deletions were very frequent when units of the different grasses were compared and it was clear that these deletions did not extend into a 75 bp spacer region upstream from the 5 S RNA gene. This 75 bp region also tended to be more conserved between the grasses as compared to the high level of sequence change in the rest of the spacer region. — Phenetic relationships were established between the grasses using the sequence data. The relationships were generally consistent with the data from other parameters and, in addition, showed that two Australian grasses were closely related to the other Northern hemisphere genera examined. The data concerning the Australian grasses is discussed in relation to the isolated nature of Australia. 相似文献
37.
38.
钙调蛋白(CaM)是一种多功能调节蛋白,它含有4个Ca~(2+)结合域.晶体研究表明所有Ca~(2+)都与主链氧原子及酸性残基侧链氧原子配位,但Ca~(2+)的配位层中是否有水分子存在尚未确定.木文利用核磁共振技术,以Mn~(2+)为探针,通过测定水质子的核磁弛豫速率T_(1P)_(-1)建立了有关Ca~(2+)配位层中水分子数目的模型,该模型指出Cam中高、低亲和位上Ca~(2+)结合水的能力不同,高亲和位上Ca~(2+)的配位层中没有水分子存在,而低亲和位上Ca~(2+)配位层中含两个水分子. 相似文献
39.
本文报道笼养和野生白腹锦鸡机体营养成分及其差异。分析表明,笼养的比野生种营养成分含量高的有:腿肌蛋白质高11%,胸肌、腿肌、全血的氨基酸分别高2.64%,1.39%和4.68%,胸肌、腿肌和肝脏的碳水化合物分别高0.076%、0.092%和3.962%,胸肌和腿肌的维生素A分别高188.63和84.09 I.U.,胸肌和腿肌的维生素D分别高47.2和12.8 I.U.。但是胸肌蛋白质含量笼养的比野生的低26%。 相似文献
40.