全文获取类型
收费全文 | 5795篇 |
免费 | 356篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 123篇 |
儿科学 | 279篇 |
妇产科学 | 206篇 |
基础医学 | 648篇 |
口腔科学 | 161篇 |
临床医学 | 592篇 |
内科学 | 1166篇 |
皮肤病学 | 148篇 |
神经病学 | 618篇 |
特种医学 | 807篇 |
外科学 | 598篇 |
综合类 | 77篇 |
一般理论 | 2篇 |
预防医学 | 246篇 |
眼科学 | 79篇 |
药学 | 183篇 |
肿瘤学 | 248篇 |
出版年
2021年 | 61篇 |
2020年 | 43篇 |
2019年 | 45篇 |
2018年 | 71篇 |
2017年 | 66篇 |
2016年 | 70篇 |
2015年 | 71篇 |
2014年 | 117篇 |
2013年 | 238篇 |
2012年 | 217篇 |
2011年 | 197篇 |
2010年 | 131篇 |
2009年 | 117篇 |
2008年 | 181篇 |
2007年 | 224篇 |
2006年 | 218篇 |
2005年 | 177篇 |
2004年 | 181篇 |
2003年 | 174篇 |
2002年 | 164篇 |
2001年 | 168篇 |
2000年 | 137篇 |
1999年 | 149篇 |
1998年 | 106篇 |
1997年 | 99篇 |
1996年 | 121篇 |
1995年 | 92篇 |
1994年 | 74篇 |
1993年 | 72篇 |
1992年 | 124篇 |
1991年 | 118篇 |
1990年 | 138篇 |
1989年 | 149篇 |
1988年 | 141篇 |
1987年 | 157篇 |
1986年 | 170篇 |
1985年 | 140篇 |
1984年 | 93篇 |
1983年 | 92篇 |
1982年 | 71篇 |
1981年 | 57篇 |
1980年 | 58篇 |
1979年 | 81篇 |
1978年 | 65篇 |
1977年 | 69篇 |
1976年 | 47篇 |
1975年 | 43篇 |
1974年 | 61篇 |
1973年 | 43篇 |
1969年 | 41篇 |
排序方式: 共有6181条查询结果,搜索用时 0 毫秒
11.
Background
Traumatic perforation of the distal oesophagus due to blunt trauma is a very rare condition and is still associated with a significant morbidity and mortality. This is further exacerbated by delayed diagnosis and management as symptoms and signs are often masked by or ascribed to more common blunt thoracic injuries. 相似文献12.
Partial N-terminal amino acid sequences of three nonstructural proteins of two flaviviruses 总被引:10,自引:0,他引:10
C M Rice R Aebersold D B Teplow J Pata J R Bell A V Vorndam D W Trent M W Brandriss J J Schlesinger J H Strauss 《Virology》1986,151(1):1-9
Partial N-terminal amino acid sequences for the three largest nonstructural proteins of two flaviviruses, yellow fever virus and St. Louis encephalitis virus, have been obtained. The determined sequences of these proteins exhibit significant amino acid sequence homology, and allow the positioning of these three nonstructural proteins in the polyprotein sequence deduced from the nucleotide sequence of yellow fever virus (C. M. Rice, E. M. Lenches, S. R. Eddy, S. J. Shin, R. L. Sheets, and J. H. Strauss, 1985, Science 229, 726-733.) The deduced start points support the hypothesis that the N terminus of nonstructural glycoprotein NS1 results from cleavage by signalase, whereas the N termini of NS3 and NS5 result from cleavages following double basic residues that are flanked by amino acids with short side chains. 相似文献
13.
14.
The prediction of outcome in schizophrenia. IV: Eleven-year follow-up of the Washington IPSS cohort 总被引:5,自引:0,他引:5
Two- and five-year follow-up observations of the International Pilot Study of Schizophrenia's Washington cohort provided data bearing on several controversial issues regarding the course of schizophrenia. Forty schizophrenic patients have now been observed 11 years after their index admission. Social, occupational, hospital utilization, and symptom areas of functioning continue to be only modestly correlated with one another and do not become increasingly uniform over time. Initial prognostic variables continue to be more predictive of long-term outcome than are cross-sectional symptom manifestations. Restricted affect at the initial evaluation had been a predictor of 5-year outcome, but it was not a significant predictor of outcome at 11 years. While serious long-term consequences of illness are observed, the follow-up data suggest that the illness tends to reach a plateau of psychopathology early in the course, with as many patients tending to improve in the long-term as those who tend to show further deterioration. 相似文献
15.
16.
17.
18.
19.
Shahriar Yazdanfar Gary S. Ledley Anthony Alfieri Clifford Strauss Morris N. Kotler 《Catheterization and cardiovascular interventions》1993,28(1):72-75
Percutaneous transluminal coronary angioplasty (PTCA) of heavily calcified rigid coronary arteries has decreased success and increased complication rates. Three cases are presented describing a new technique for the dilatation of severely calcified coronary arteries that were not dilatable by conventional angioplasty methods. This technique involves the use of a balloon dilatation catheter system parallel to a guide wire. © 1993 Wiley-Liss, Inc. 相似文献
20.
Effect of isoelectric point on biodistribution and inflammation imaging with indium-111-labelled IgG
Caroline I. ten Kate Alan J. Fischman Robert H. Rubin A. J. Fucello D. Riexinger Robert A. Wilkinson Lina Du Ban An Khaw H. William Strauss 《European journal of nuclear medicine and molecular imaging》1990,17(6-8):305-309
Electrostatic effects play an important role in protein interactions and may alter the biodistribution of antibodies. To study the effect of molecular charge on the biodistribution and infection imaging properties of human polyclonal immunoglobulin G (IgG), its iso electric point was varied by changing the level of diethylene triamine penta-acetic acid (DTPA) substitution: 0.8, 0.9, 3.7, 5.1 and 5.9 DTPA/IgG. Biodistributions of the different IgG preparations were determined at 10 min, 1, 6, 24, and 48 h post injection in normal rats, and infection imaging properties were determined in rats withEscherichia coli thigh infections. The biodistribution was significantly affected by pl. The immunoglobulin preparations with 0.9 and 3.7 DTPA/IgG showed faster clearance from the circulation and generally lower accumulation in most organs. The images had a target-to-background ratio of approximately 1.3–2.3:1. These results suggest that even though targeting is not affected by the level of DTPA substitutions, preparations with 0.9 and 3.7 DTPA/IgG may be superior imaging agents because of reduced accumulation by background organs. 相似文献