全文获取类型
收费全文 | 1167176篇 |
免费 | 85818篇 |
国内免费 | 15574篇 |
专业分类
耳鼻咽喉 | 15095篇 |
儿科学 | 27462篇 |
妇产科学 | 27836篇 |
基础医学 | 160264篇 |
口腔科学 | 32324篇 |
临床医学 | 110896篇 |
内科学 | 221386篇 |
皮肤病学 | 21945篇 |
神经病学 | 85441篇 |
特种医学 | 45113篇 |
外国民族医学 | 175篇 |
外科学 | 177863篇 |
综合类 | 51675篇 |
现状与发展 | 49篇 |
一般理论 | 276篇 |
预防医学 | 76521篇 |
眼科学 | 27853篇 |
药学 | 95989篇 |
167篇 | |
中国医学 | 12969篇 |
肿瘤学 | 77269篇 |
出版年
2022年 | 10905篇 |
2021年 | 16933篇 |
2020年 | 11967篇 |
2019年 | 13412篇 |
2018年 | 16806篇 |
2017年 | 13868篇 |
2016年 | 14301篇 |
2015年 | 18758篇 |
2014年 | 24502篇 |
2013年 | 29405篇 |
2012年 | 41325篇 |
2011年 | 43948篇 |
2010年 | 26487篇 |
2009年 | 23721篇 |
2008年 | 37079篇 |
2007年 | 38223篇 |
2006年 | 38537篇 |
2005年 | 37649篇 |
2004年 | 32923篇 |
2003年 | 31002篇 |
2002年 | 29548篇 |
2001年 | 59880篇 |
2000年 | 61813篇 |
1999年 | 52689篇 |
1998年 | 14340篇 |
1997年 | 13115篇 |
1996年 | 12348篇 |
1995年 | 11508篇 |
1994年 | 10508篇 |
1993年 | 9094篇 |
1992年 | 37495篇 |
1991年 | 35642篇 |
1990年 | 34166篇 |
1989年 | 33154篇 |
1988年 | 30075篇 |
1987年 | 29271篇 |
1986年 | 27100篇 |
1985年 | 25755篇 |
1984年 | 18239篇 |
1983年 | 15464篇 |
1982年 | 7999篇 |
1979年 | 15983篇 |
1978年 | 10717篇 |
1977年 | 9171篇 |
1975年 | 8698篇 |
1974年 | 10559篇 |
1973年 | 9941篇 |
1972年 | 9411篇 |
1971年 | 8906篇 |
1970年 | 8476篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Y. Kajiya M. Nakajo N. Ichinari Y. Kajiya K. Yamazumi T. Otuji T. Tanaka 《Abdominal imaging》1997,22(1):111-113
A foregut cyst is formed as a result of abnormal budding and pinching of the tracheobronchial tree when bronchial buds develop
to form the primitive respiratory tree. Foregut cysts are clinically classified as bronchogenic, esophageal, enterogastric,
or ciliated hepatic. We present a foregut cyst that occurred in the retroperitoneum and was difficult to distinguish from
other retroperitoneal cystic mass lesions. Magnetic resonance imaging was useful in revealing the cyst's continuity to adjacent
organs.
Received: 19 June 1995/Accepted: 23 July 1995 相似文献
993.
994.
S Tanaka T Nishihara T Nagashima K Kawai S Nakai M Adachi 《Journal of clinical neuroscience》1997,4(1):57-62
The effects of 3,4-dihydro-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-2(1H)-quinolinone (vesnarinone) on the growth of glioma cells were examined in vitro. Vesnarinone at a dose of 100 mug/ml suppressed the growth of four different glioma cell lines, U-251MG, U-373MG, U-87MG and A-172, by approximately 50%, with an elongation of the cytoplasmic process on day 5 of culture. The long-term culture of U-87MG with 10 mug/ml of vesnarinone was continued up to day 34. Although growth suppression was approximately 25% on day 5, it reached over 95% on day 34. An increase in the cyclic adenosine monophosphate content of glioma cells cultured with vesnarinone was observed by enzyme-linked immunosorbent assay (ELISA). The accumulation of glial fibrillary acidic protein was observed to occur with vesnarinone by ELISA. These findings suggest that vesnarinone suppressed the growth and induced differentiation of glioma cells in vitro. 相似文献
995.
Kevin G Becker Insong J Lee James W Nagle Rachel D Canning Ameer M Gado Rosarelis Torres Mihael H Polymeropoulos Paul T Massa WilliamE Biddison Paul D Drew 《International journal of developmental neuroscience》1997,15(7):73
We describe a novel human zinc finger cNDA, C2H2-171. This cDNA represents an mRNA which encodes a protein of 484 amino acids and a calculated molecular weight of 54 kD. Four zinc finger-like domains are found in the C-terminal end of the protein. At the N-terminus, C2H2-171 contains a POZ/tramtrack-like domain similar to that found in the tumor associated zinc finger proteins LAZ-3/BCL-6 and PLZ-F, as well as in non-zinc finger proteins. C2H2-171 RNA is preferentially expressed in the brain, and increases during the course of murine development, with maximal expression in the adult. C2H2-171 RNA is differentially expressed in brain regions, with the highest level of expression in the cerebellum. C2H2-171 RNA was expressed at high levels in primary cerebellar granule cell neurons compared to astrocytes. The gene encoding C2H2-171 is highly conserved in vertebrates, and maps to the terminus of human chromosome 1 (1q44-ter). This chromosomal location is associated with a number of cytogenetic aberrations including those involving brain developmental anomalies and tumorigenesis. These data suggest that C2H2-171 may play an important role in vertebrate brain development and function. 相似文献
996.
997.
998.
999.
斑点—酶联免疫吸附试验检测卡氏肺孢子虫 总被引:1,自引:0,他引:1
应用完整的卡氏肺孢子虫包囊作抗原,以4×10^7/ml包裹点样,作斑点-酶联免疫吸附试验检测肺印片卡氏肺孢子虫包囊阳性的BALB/c小鼠血清20份,同时检测包囊阴性的小鼠血清20份,结果除一份小鼠血清IgG阴性反应外,均为阳性反应,阳性率为95%;而正常对照血清全为阴性反应。另外,检测了3份纤支镜刷检物中包囊阳性的病人血清,均为阳性反应;50例健康孕妇血清的检查,抗体阳性率为12%。 相似文献
1000.