全文获取类型
收费全文 | 22744篇 |
免费 | 1512篇 |
国内免费 | 9篇 |
出版年
2023年 | 112篇 |
2022年 | 122篇 |
2021年 | 589篇 |
2020年 | 367篇 |
2019年 | 484篇 |
2018年 | 620篇 |
2017年 | 506篇 |
2016年 | 832篇 |
2015年 | 1232篇 |
2014年 | 1371篇 |
2013年 | 1692篇 |
2012年 | 1972篇 |
2011年 | 1927篇 |
2010年 | 1213篇 |
2009年 | 1045篇 |
2008年 | 1418篇 |
2007年 | 1337篇 |
2006年 | 1221篇 |
2005年 | 1142篇 |
2004年 | 1037篇 |
2003年 | 970篇 |
2002年 | 783篇 |
2001年 | 151篇 |
2000年 | 137篇 |
1999年 | 157篇 |
1998年 | 130篇 |
1997年 | 116篇 |
1996年 | 90篇 |
1995年 | 87篇 |
1994年 | 90篇 |
1993年 | 89篇 |
1992年 | 76篇 |
1991年 | 80篇 |
1990年 | 73篇 |
1989年 | 60篇 |
1988年 | 63篇 |
1987年 | 57篇 |
1986年 | 57篇 |
1985年 | 70篇 |
1984年 | 54篇 |
1983年 | 50篇 |
1982年 | 40篇 |
1981年 | 45篇 |
1979年 | 41篇 |
1978年 | 37篇 |
1977年 | 34篇 |
1976年 | 31篇 |
1975年 | 31篇 |
1974年 | 31篇 |
1973年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 41 毫秒
1.
Sebastián Moran Miguel Vizoso Anna Martinez-Cardús Antonio Gomez Xavier Matías-Guiu Sebastián M Chiavenna Andrés G Fernandez Manel Esteller 《Epigenetics》2014,9(6):829-833
A formalin-fixed paraffin-embedded (FFPE) sample usually yields highly degraded DNA, which limits the use of techniques requiring high-quality DNA, such as Infinium Methylation microarrays. To overcome this restriction, we have applied an FFPE restoration procedure consisting of DNA repair and ligation processes in a set of paired fresh-frozen (FF) and FFPE samples. We validated the FFPE results in comparison with matched FF samples, enabling us to use FFPE samples on the Infinium HumanMethylation450 Methylation array. 相似文献
2.
N N Alipov G I Kositski? T E Kuznetsova 《Biulleten' eksperimental'no? biologii i meditsiny》1985,99(2):169-171
Experiments on frogs were performed to examine the effect of the M-cholinomimetic pilocarpine on the heart. It was discovered that at concentrations of 10(-15)--10(-5) g/ml pilocarpine exerted only an adverse chronotropic effect on the perfused heart. When applied at a concentration of 10(-4) g/ml the drug produced a negative as well as a positive chronotropic effect. The latter occurred spasmodically (without progressive rise in the heart rate) in association with a slow heart rate. In some experiments such effects were preceded by a certain deceleration of the heart. In experiments with positive chronotropic effects, arrhythmias and sinoatrial dissociation were observed sometimes. Experiments with recording of the electrograms of the sinuses and lower parts showed that such effects were caused not by pacemaker acceleration but by the removal of the blockade of conduction, between the pacemaker and the atria. As far as the pacemaker is concerned, pilocarpine exerted only a negative chronotropic effect. 相似文献
3.
4.
5.
6.
Anna Morcom 《The journal of the Royal Anthropological Institute》2014,20(4):788-789
7.
8.
9.
10.
Kazazoglou Theodosia Panagiotou Christina Mihailidou Chrysovalantou Kokkinopoulou Ioanna Papadopoulou Anna Moutsatsou Paraskevi 《Molecular and cellular biochemistry》2021,476(12):4471-4485
Molecular and Cellular Biochemistry - Glucocorticoids (GCs) regulate astrocyte function, while glutamine synthetase (GS), an enzyme highly expressed in astrocytes, is one of the most remarkable... 相似文献