全文获取类型
收费全文 | 3247篇 |
免费 | 235篇 |
专业分类
3482篇 |
出版年
2023年 | 29篇 |
2022年 | 26篇 |
2021年 | 51篇 |
2020年 | 38篇 |
2019年 | 33篇 |
2018年 | 94篇 |
2017年 | 85篇 |
2016年 | 150篇 |
2015年 | 122篇 |
2014年 | 145篇 |
2013年 | 260篇 |
2012年 | 123篇 |
2011年 | 110篇 |
2010年 | 125篇 |
2009年 | 109篇 |
2008年 | 116篇 |
2007年 | 68篇 |
2006年 | 113篇 |
2005年 | 84篇 |
2004年 | 75篇 |
2003年 | 83篇 |
2002年 | 74篇 |
2001年 | 60篇 |
2000年 | 56篇 |
1999年 | 57篇 |
1998年 | 65篇 |
1997年 | 39篇 |
1996年 | 50篇 |
1995年 | 47篇 |
1994年 | 49篇 |
1993年 | 55篇 |
1992年 | 33篇 |
1991年 | 33篇 |
1989年 | 26篇 |
1988年 | 32篇 |
1985年 | 29篇 |
1984年 | 24篇 |
1981年 | 30篇 |
1980年 | 36篇 |
1978年 | 28篇 |
1975年 | 25篇 |
1974年 | 37篇 |
1973年 | 28篇 |
1972年 | 25篇 |
1971年 | 26篇 |
1969年 | 27篇 |
1966年 | 27篇 |
1963年 | 24篇 |
1962年 | 27篇 |
1960年 | 24篇 |
排序方式: 共有3482条查询结果,搜索用时 15 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.
Summary The frequency of large granular lymphocytes (LGL) in the peripheral blood of healthy persons (n=56) and breast cancer patients (31 cases with stage-I and -II disease and 42 cases with stage-III and -IV disease) was studied. The frequency of LGL in peripheral blood was significantly depressed in cancer patients, and particularly in patients with advanced breast cancer. 相似文献
4.
H. Štorchová 《Biologia Plantarum》1994,36(3):358-358
5.
6.
7.
F. Šrámek 《Biologia Plantarum》1999,42(4):582-582
8.
Hana Votavová Vladimír Gut Karel Bláha Jaroslav Šponar 《International journal of biological macromolecules》1982,4(6):341-346
DNA complexes with polypeptides (Lys-Ala-Ala)1)] and (Lys-Ala-Ala)34 have been studied using the methods of thermal melting and circular dichroism. Derivative melting curves of (Lys-Ala-Ala)10 DNA differed substantially from those of (Lys-Ala-Ala)34 prepared either by salt gradient dialysis or by direct mixing. Melting curves of the former complex were unimodal or bimodal with Tm increasing continuously withn input lysin-to-DNA phosphate ratio (r); those of the latter complex consisted of three separate transitions with Tm values almost independent of r. Complete reversibility of binding in the (Lys-Ala-Ala)10-DNA system but a slow redistribution of (Lys-Ala-Ala)34 on DNA at low temperature were found in the redistribution experiments Much faster redistribution from denatured to native DNA occurs at the temperature of melting, contributing to the unusual trimodal melting pattern. Circular dichroism curves are very similar for both complexes and indicate little change of DNA conformation upon polypeptide binding. 相似文献
9.
10.