全文获取类型
收费全文 | 636363篇 |
免费 | 34133篇 |
国内免费 | 2065篇 |
专业分类
耳鼻咽喉 | 8124篇 |
儿科学 | 19613篇 |
妇产科学 | 16360篇 |
基础医学 | 108302篇 |
口腔科学 | 15707篇 |
临床医学 | 56610篇 |
内科学 | 114856篇 |
皮肤病学 | 14083篇 |
神经病学 | 41355篇 |
特种医学 | 23318篇 |
外国民族医学 | 56篇 |
外科学 | 93220篇 |
综合类 | 12757篇 |
现状与发展 | 2篇 |
一般理论 | 141篇 |
预防医学 | 46265篇 |
眼科学 | 14569篇 |
药学 | 50413篇 |
1篇 | |
中国医学 | 1942篇 |
肿瘤学 | 34867篇 |
出版年
2021年 | 4798篇 |
2019年 | 4865篇 |
2018年 | 7224篇 |
2017年 | 5208篇 |
2016年 | 5969篇 |
2015年 | 6674篇 |
2014年 | 8872篇 |
2013年 | 12762篇 |
2012年 | 18813篇 |
2011年 | 20835篇 |
2010年 | 12032篇 |
2009年 | 10700篇 |
2008年 | 18773篇 |
2007年 | 20665篇 |
2006年 | 20182篇 |
2005年 | 19104篇 |
2004年 | 18509篇 |
2003年 | 17698篇 |
2002年 | 17080篇 |
2001年 | 28552篇 |
2000年 | 29235篇 |
1999年 | 24164篇 |
1998年 | 6975篇 |
1997年 | 5663篇 |
1996年 | 5238篇 |
1995年 | 4912篇 |
1992年 | 17802篇 |
1991年 | 19227篇 |
1990年 | 19087篇 |
1989年 | 18725篇 |
1988年 | 17383篇 |
1987年 | 17147篇 |
1986年 | 15913篇 |
1985年 | 15347篇 |
1984年 | 11199篇 |
1983年 | 9608篇 |
1982年 | 5048篇 |
1979年 | 10628篇 |
1978年 | 7390篇 |
1977年 | 5997篇 |
1976年 | 6291篇 |
1975年 | 7605篇 |
1974年 | 8573篇 |
1973年 | 8367篇 |
1972年 | 7765篇 |
1971年 | 7368篇 |
1970年 | 6863篇 |
1969年 | 6433篇 |
1968年 | 6028篇 |
1967年 | 5390篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Elevated amounts of platelet-associated serum proteins (PASP) can be detected in idiopathic thrombocytopenic purpura (ITP) and are considered to be of patho-aetiological importance especially in the case of acute ITP, that commonly follows acute febrile illnesses. Using a micro-enzyme-linked immunoassay we examined PASP (IgG, IgM, and C3) in 120 paediatric patients with acute fever caused by viral (n = 45), bacterial (n = 48), or non-detectable agents (n = 27) and compared those values to the levels of PASP of an own paediatric control group (n = 21). Two of the patients presented mild temporary thrombocytopenia without clinical signs in the course of their infectious disease. While having normal platelet counts, the majority of our patients (69.2%) however, showed increased levels of PASP (IgG, IgM, C3; single or combined). Significant differences of PASP levels by discrimination of viral and bacterial diseases could not be demonstrated. Elevated platelet-associated complement was of special interest, because - in the absence of low platelet counts due to platelet-specific antibodies - it must be regarded as an indicator for immune complexes (IC) binding to thrombocyte surface IgG Fc-receptors. Thus we suggest that platelets play a considerable role in the elimination of circulating IC. 相似文献
993.
994.
995.
996.
997.
998.
C. V. Dalchow A. L. Weber S. Bien N. Yanagihara J. A. Werner 《European archives of oto-rhino-laryngology》2006,263(2):92-99
Digital volume tomography (DVT) is an extension of panoramic tomography. With this diagnostic technique, characterized by high resolution, a narrow section width (0.125 mm) and three-dimensional display, small pathological processes can be well visualized. Twenty-five patients with the history of a progressive hearing loss were examined with DVT (Accu-I-tomo, Morita, Japan). The results were compared with pre- and intraoperative findings to evaluate the diagnostic value of DVT in cases of erosion of the ossicular chain. With high resolution and artifact-free demonstration of the middle ear and the ossicular chain, it was possible to define its continuity preoperatively by DVT in all 25 cases. An intact ossicular chain was found by DVT in 13 cases and was later confirmed by surgery. The predicted erosion of the ossicles was verified in 12 patients, and a tympanoplasty type III was performed. Digital volume tomography is an excellent technique to examine the middle ear cleft and inner ear, and expands the application of diagnostic possibilities in the lateral skull base. Therefore, improvement in preoperative diagnosis is achieved along with more accurate planning of the surgical procedure. Digital volume tomography delivers a small radiation dose with a high resolution and a low purchase price for the equipment. 相似文献
999.
1000.
A scheme of physicochemical determination of fibrinogen and the major molecular derivatives in a single sample of plasma is suggested, available for the majority of clinical laboratories. Such determination gives valuable information for a clinician. Among other things, the level of rapidly thrombin clotted fibrinogen portion is determined, as is the content of high-molecular fibrin monomer complexes, not clotted with thrombin, and the level of fibrinogen and fibrin proteolytic degradation products. Clinical (in 42 patients with various conditions) and experimental (coagulopathy in amniotic fluid embolism) application of this scheme has confirmed its clinico-diagnostic value. 相似文献