全文获取类型
收费全文 | 326篇 |
免费 | 0篇 |
国内免费 | 39篇 |
出版年
2024年 | 1篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 20篇 |
2012年 | 2篇 |
2010年 | 3篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 10篇 |
2004年 | 1篇 |
2003年 | 9篇 |
2002年 | 9篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1994年 | 13篇 |
1993年 | 11篇 |
1991年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 9篇 |
1984年 | 23篇 |
1983年 | 41篇 |
1982年 | 47篇 |
1981年 | 31篇 |
1980年 | 18篇 |
1979年 | 18篇 |
1978年 | 20篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1975年 | 4篇 |
1974年 | 11篇 |
1973年 | 5篇 |
排序方式: 共有365条查询结果,搜索用时 15 毫秒
21.
J C Zolman 《FEBS letters》1982,143(1):26-28
Aspartate, glutamate, serine and glycine all permeate the inner membrane of mitochondria isolated from both etiolated and green plant tissues. No significant difference was found in the transport characteristics shown by mitochondria from either tissue. Influx of each amino acid appears diffusional because substrate saturation was not observed and there was no indication of specific inhibition or a requirement for a compensatory or counter ion for uptake. In contrast, uptake of the keto acid pyruvate did appear saturable. Inhibition by α-cyano-4-hydroxycinnamate, mersalyl and FCCP, but not valinomycin, suggests a carrier and a ΔpH mediate pyruvate transport into the matrix. 相似文献
22.
Rapid oxidation processes relevant to the degradation of [4Fe4S] clusters in Clostridium pasteurianum ferredoxin were studied via direct (unmediated) heterogeneous electron transfer at a pyrolytic graphite electrode. Differential-pulse voltammograms of native [4Fe4S] ferredoxin showed two well-defined oxidation peaks corresponding to apparent E-values of +793 and +1120 mV at 5°C. Direct involvement of the cluster was established through parallel experiments with the 2[4Fe4Se] derivative for which peak positions were shifted. Square-wave voltammetry showed that the product of the first electron transfer, which may correspond to the ‘super-oxidised’ [4Fe4S]3+ oxidation level, undergoes rapid degradation (t < 1.6 ms at 5°C). The second oxidation process, as characterised by a significant (?100 mV) negative shift upon selenium substitution, very likely represents oxidation of S(Se) still associated with the protein and possibly contained within the remaining FES(Se) substructure. 相似文献
23.
24.
25.
26.
27.
28.
29.
30.