全文获取类型
收费全文 | 2833篇 |
免费 | 320篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 211篇 |
妇产科学 | 164篇 |
基础医学 | 244篇 |
口腔科学 | 48篇 |
临床医学 | 402篇 |
内科学 | 616篇 |
皮肤病学 | 133篇 |
神经病学 | 126篇 |
特种医学 | 319篇 |
外科学 | 351篇 |
综合类 | 119篇 |
现状与发展 | 30篇 |
一般理论 | 7篇 |
预防医学 | 133篇 |
眼科学 | 31篇 |
药学 | 97篇 |
中国医学 | 3篇 |
肿瘤学 | 112篇 |
出版年
2024年 | 15篇 |
2023年 | 178篇 |
2022年 | 18篇 |
2021年 | 48篇 |
2020年 | 73篇 |
2019年 | 51篇 |
2018年 | 81篇 |
2017年 | 73篇 |
2016年 | 67篇 |
2015年 | 79篇 |
2014年 | 130篇 |
2013年 | 107篇 |
2012年 | 119篇 |
2011年 | 122篇 |
2010年 | 112篇 |
2009年 | 116篇 |
2008年 | 117篇 |
2007年 | 134篇 |
2006年 | 100篇 |
2005年 | 85篇 |
2004年 | 86篇 |
2003年 | 88篇 |
2002年 | 62篇 |
2001年 | 58篇 |
2000年 | 53篇 |
1999年 | 77篇 |
1998年 | 50篇 |
1997年 | 68篇 |
1996年 | 50篇 |
1995年 | 49篇 |
1994年 | 36篇 |
1993年 | 41篇 |
1992年 | 45篇 |
1991年 | 34篇 |
1990年 | 38篇 |
1989年 | 47篇 |
1988年 | 46篇 |
1987年 | 45篇 |
1986年 | 33篇 |
1985年 | 31篇 |
1984年 | 29篇 |
1983年 | 26篇 |
1982年 | 22篇 |
1981年 | 26篇 |
1980年 | 27篇 |
1979年 | 15篇 |
1978年 | 23篇 |
1977年 | 15篇 |
1976年 | 25篇 |
1975年 | 19篇 |
排序方式: 共有3173条查询结果,搜索用时 312 毫秒
11.
Recent studies suggest that semiconductor workers have an increased incidence of work-related illness. Semiconductor manufacturing is a chemically intensive industry involving many potentially hazardous operations. As this industry moves into new geographic areas, health care professionals will be asked to evaluate medical or workplace conditions associated with unfamiliar and complex production processes. This paper provides an overview of semiconductor manufacturing processes for these health practitioners. Each step of device fabrication is detailed with its attendant chemical and physical hazards. Broader concepts of industrial control technology, clean room ventilation, and ergonomics are explained. The hazards are tabulated to allow rapid assessment of the risks inherent to each processing step. References have been chosen to guide the reader to more indepth information. 相似文献
12.
13.
Hershel Jick M.D. Marian Wald Myers P.A.-C. Alan D. Dean M.B. B.S. 《Pharmacotherapy》1995,15(2):176-181
Sulfasalazine (SASP) has often been reported to cause serious blood disorders, particularly agranulocytosis; however, little quantitative information is available to estimate the risk or to identify possible modifiers of the risk. We used comprehensive clinical information recorded on office computers by selected general practitioners in Britain to conduct a follow-up study of some 10,000 users of SASP and some 4000 users of mesalazine to estimate the risk of blood disorders associated with these drugs. Overall, the frequency of blood disorders attributable to SASP was 27/10,332 (2.6/1000 users). The risk for SASP users who were treated for arthritic disorders (6.1/1000 users) was some 10 times higher than that for users who were treated for inflammatory bowel disease (0.6/1000 users). There were no cases of blood disorders in users of mesalazine. 相似文献
14.
The CCR5Delta32 allele is associated with reduced liver inflammation in hepatitis C virus infection.
O Wald O Pappo Z B Ari E Azzaria I D Wiess I Gafnovitch H Wald U Spengler E Galun A Peled 《European journal of immunogenetics》2004,31(6):249-252
CCR5Delta32 is a deletion mutation in the chemokine receptor CCR5. Liver inflammatory activity was found to be significantly reduced (P = 0.005) in Jewish Israeli patients infected with the hepatitis C virus (HCV) carrying the CCR5Delta32 allele. The CCR5Delta32 allele does not alter susceptibility to HCV infection; however, it may play a role in the progression and outcome of the disease. 相似文献
15.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
16.
17.
18.
19.
Roderik Metz Gino MMJ Kerkhoffs Egbert-Jan MM Verleisdonk Geert J van der Heijden 《BMC musculoskeletal disorders》2007,8(1):108
Background
We present the design of an open randomized multi-centre study on surgical versus conservative treatment of acute Achilles tendon ruptures. The study is designed to evaluate the effectiveness of conservative treatment in reducing complications when treating acute Achilles tendon rupture. 相似文献20.
Fa-Hsuan Lin Shang-Yueh Tsai Ricardo Otazo Arvind Caprihan Lawrence L Wald John W Belliveau Stefan Posse 《Magnetic resonance in medicine》2007,57(2):249-257
Magnetic resonance spectroscopic imaging (MRSI) provides spatially resolved metabolite information that is invaluable for both neuroscience studies and clinical applications. However, lengthy data acquisition times, which are a result of time-consuming phase encoding, represent a major challenge for MRSI. Fast MRSI pulse sequences that use echo-planar readout gradients, such as proton echo-planar spectroscopic imaging (PEPSI), are capable of fast spectral-spatial encoding and thus enable acceleration of image acquisition times. Combining PEPSI with recent advances in parallel MRI utilizing RF coil arrays can further accelerate MRSI data acquisition. Here we investigate the feasibility of ultrafast spectroscopic imaging at high field (3T and 4T) by combining PEPSI with sensitivity-encoded (SENSE) MRI using eight-channel head coil arrays. We show that the acquisition of single-average SENSE-PEPSI data at a short TE (15 ms) can be accelerated to 32 s or less, depending on the field strength, to obtain metabolic images of choline (Cho), creatine (Cre), N-acetyl-aspartate (NAA), and J-coupled metabolites (e.g., glutamate (Glu) and inositol (Ino)) with acceptable spectral quality and localization. The experimentally measured reductions in signal-to-noise ratio (SNR) and Cramer-Rao lower bounds (CRLBs) of metabolite resonances were well explained by both the g-factor and reduced measurement times. Thus, this technology is a promising means of reducing the scan times of 3D acquisitions and time-resolved 2D measurements. 相似文献