全文获取类型
收费全文 | 23265篇 |
免费 | 1651篇 |
国内免费 | 9篇 |
出版年
2023年 | 115篇 |
2022年 | 233篇 |
2021年 | 594篇 |
2020年 | 360篇 |
2019年 | 478篇 |
2018年 | 600篇 |
2017年 | 492篇 |
2016年 | 820篇 |
2015年 | 1261篇 |
2014年 | 1382篇 |
2013年 | 1718篇 |
2012年 | 2010篇 |
2011年 | 1955篇 |
2010年 | 1203篇 |
2009年 | 1054篇 |
2008年 | 1425篇 |
2007年 | 1345篇 |
2006年 | 1242篇 |
2005年 | 1147篇 |
2004年 | 1047篇 |
2003年 | 961篇 |
2002年 | 794篇 |
2001年 | 157篇 |
2000年 | 147篇 |
1999年 | 177篇 |
1998年 | 145篇 |
1997年 | 135篇 |
1996年 | 101篇 |
1995年 | 102篇 |
1994年 | 105篇 |
1993年 | 106篇 |
1992年 | 78篇 |
1991年 | 75篇 |
1990年 | 94篇 |
1989年 | 77篇 |
1988年 | 79篇 |
1987年 | 66篇 |
1986年 | 72篇 |
1985年 | 75篇 |
1984年 | 59篇 |
1983年 | 60篇 |
1982年 | 42篇 |
1981年 | 59篇 |
1980年 | 39篇 |
1979年 | 64篇 |
1978年 | 53篇 |
1977年 | 44篇 |
1976年 | 51篇 |
1975年 | 40篇 |
1973年 | 39篇 |
排序方式: 共有10000条查询结果,搜索用时 31 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.
3.
4.
5.
Anna Morcom 《The journal of the Royal Anthropological Institute》2014,20(4):788-789
6.
7.
8.
9.
Digestion in the cattle-tick Boophilus microplus: light microscope study of the gut cells in nymphs and females 总被引:3,自引:0,他引:3
The gut caeca of B. microplus were studied by light microscopy using paraffin and methacrylate embedded material. It has been shown that during feeding of nymphs and adults, the midgut consists of five cell types, stem cell, digest cell, secretory cells (s1) and (s2) and basophilic cell. The stem cell differentiates into any of the other cell types. The digest cell matures through a series of stages and has up to three generations during feeding on the host. The final generation has two distinct cell types, the first type is thought to be capable of both phagocytosis and pinocytosis. Cells of the second type are predominant at the end of feeding, and may be specialized to ingest and digest haemoglobin. The final stage of the digest series is the spent digest cell which discharges its content into the gut lumen or is excreted whole. The basophilic cell has structures which suggest that one of its functions is to transport digested materials, water and ions across the gut. Secretory cell (s1) secretes a glycoprotein which may be a haemolysin and secretory cell (s2) secretes the gut “colloid” mass, an acid mucopolysaccharide, which may function as an anticoagulant. Intracellular digestion leads to the breakdown of host blood and storage of lipid and glycogen in the digest cells. 相似文献
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