全文获取类型
收费全文 | 4474篇 |
免费 | 338篇 |
出版年
2023年 | 36篇 |
2021年 | 48篇 |
2020年 | 40篇 |
2019年 | 33篇 |
2018年 | 129篇 |
2017年 | 104篇 |
2016年 | 187篇 |
2015年 | 171篇 |
2014年 | 225篇 |
2013年 | 370篇 |
2012年 | 223篇 |
2011年 | 193篇 |
2010年 | 167篇 |
2009年 | 121篇 |
2008年 | 198篇 |
2007年 | 149篇 |
2006年 | 202篇 |
2005年 | 173篇 |
2004年 | 139篇 |
2003年 | 138篇 |
2002年 | 127篇 |
2001年 | 86篇 |
2000年 | 106篇 |
1999年 | 73篇 |
1998年 | 66篇 |
1997年 | 43篇 |
1996年 | 55篇 |
1995年 | 52篇 |
1994年 | 54篇 |
1993年 | 58篇 |
1992年 | 39篇 |
1991年 | 36篇 |
1989年 | 35篇 |
1988年 | 41篇 |
1987年 | 30篇 |
1985年 | 36篇 |
1984年 | 35篇 |
1983年 | 31篇 |
1982年 | 33篇 |
1981年 | 32篇 |
1980年 | 38篇 |
1979年 | 27篇 |
1978年 | 29篇 |
1975年 | 32篇 |
1974年 | 48篇 |
1973年 | 40篇 |
1972年 | 29篇 |
1971年 | 30篇 |
1969年 | 30篇 |
1966年 | 29篇 |
排序方式: 共有4812条查询结果,搜索用时 31 毫秒
1.
A. Španová 《Folia microbiologica》1980,25(4):281-288
Temperature-sensitive (ts) mutations of the G101 phage were isolated after mutagenesis with hydroxylamine. A complementation analysis of 61ts mutants showed that these mutants may be divided into at least 12 complementation groups. Twots mutants probably originated in genes which control lytic functions of the G101 phage. It was shown by three factor crosses
that all of the 12ts mutations tested are localized on that side of the “c” region where the probablecI repressor gene is positioned. Sevents mutations is closely linked to thecI
26 clear marker, three exhibit a closer linkage and two do not exhibit any linkage withcI. All mutations isolated until now can be arrange linearly. According to the present knowledge the preliminary genetic map
of the G101 phage is linear. 相似文献
2.
3.
Michael D. Jensen Ji?í Bajnárek Sang Yeoup Lee Soren Nielsen Christina Koutsari 《Journal of lipid research》2009,50(9):1863-1869
The relationship between overnight postabsorptive (fasting) respiratory exchange ratio (RER) and plasma FFA concentrations was addressed using data from three separate protocols, each of which involved careful control of the antecedent diet. Protocol 1 examined the relationship between fasting RER and the previous daytime RER. In Protocol 2 fasting, RER and plasma palmitate concentrations were measured in 29 women and 31 men (body mass index <30 kg·m−2). Protocol 3 analyzed data from Nielsen et al. (Nielsen, S., Z. K. Guo, J. B. Albu, S. Klein, P. C. O''Brien, M. D. Jensen. 2003. Energy expenditure, sex and endogenous fuel availability in humans. J. Clin. Invest. 111: 981-988.) to understand how fasting RER and palmitate concentrations relate within individuals during four consecutive measurements. The results were as follows: 1) Fasting RER was correlated (r = 0.74, P < 0.001) with the previous day''s average RER, and less so with RER variability. 2) Fasting RER was correlated (r = −0.39, P = 0.007) with fasting plasma palmitate concentrations. 3) The pattern of the RER/palmitate relationship was similar within individuals and between individuals; a negative slope was observed significantly more often than a positive slope (χ2 test; P < 0.001). Our findings suggest that, despite a fixed food quotient, the slight departures from energy equilibrium in a controlled General Clinical Research Center environment can effect plasma FFA concentrations. We suggest that including indirect calorimetry as part of FFA metabolism studies may aid in data interpretation. 相似文献
4.
H. Štorchová 《Biologia Plantarum》1994,36(3):358-358
5.
6.
7.
8.
9.
F. Šrámek 《Biologia Plantarum》1999,42(4):582-582
10.
Summary The child with iminoglycinuria is in our observation. Hyperprolinuria was seen at 5 months by screening program. The child was repeatedly examined in the hospital and was seen last time at 16 months. IQ was 67, in the urine were excessive amounts of glycine, proline a hydroxyproline. In the blood aminoacids were in normal levels. In the child was noticed the same increase of proline in the blood as in the control child of the same age following loading test with L-proline, indicating normal intestinal absoption. Both parents and father's sister's 2-year-old mentally retarded child exhibit excessive glycinuria. The father, his sister, father's father, and grandfather are partialy, congenitaly deaf. 相似文献