全文获取类型
收费全文 | 4244篇 |
免费 | 217篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 153篇 |
妇产科学 | 93篇 |
基础医学 | 525篇 |
口腔科学 | 33篇 |
临床医学 | 307篇 |
内科学 | 914篇 |
皮肤病学 | 143篇 |
神经病学 | 238篇 |
特种医学 | 75篇 |
外科学 | 701篇 |
综合类 | 119篇 |
一般理论 | 1篇 |
预防医学 | 217篇 |
眼科学 | 175篇 |
药学 | 363篇 |
中国医学 | 57篇 |
肿瘤学 | 332篇 |
出版年
2023年 | 30篇 |
2022年 | 54篇 |
2021年 | 138篇 |
2020年 | 67篇 |
2019年 | 115篇 |
2018年 | 101篇 |
2017年 | 96篇 |
2016年 | 122篇 |
2015年 | 120篇 |
2014年 | 179篇 |
2013年 | 229篇 |
2012年 | 372篇 |
2011年 | 368篇 |
2010年 | 198篇 |
2009年 | 154篇 |
2008年 | 269篇 |
2007年 | 221篇 |
2006年 | 238篇 |
2005年 | 199篇 |
2004年 | 191篇 |
2003年 | 141篇 |
2002年 | 118篇 |
2001年 | 74篇 |
2000年 | 83篇 |
1999年 | 59篇 |
1998年 | 24篇 |
1997年 | 23篇 |
1996年 | 23篇 |
1995年 | 22篇 |
1994年 | 12篇 |
1993年 | 21篇 |
1992年 | 31篇 |
1991年 | 44篇 |
1990年 | 40篇 |
1989年 | 29篇 |
1988年 | 27篇 |
1987年 | 23篇 |
1986年 | 17篇 |
1985年 | 22篇 |
1984年 | 18篇 |
1983年 | 18篇 |
1982年 | 14篇 |
1980年 | 11篇 |
1979年 | 21篇 |
1976年 | 8篇 |
1975年 | 8篇 |
1974年 | 9篇 |
1971年 | 8篇 |
1970年 | 7篇 |
1969年 | 12篇 |
排序方式: 共有4480条查询结果,搜索用时 15 毫秒
1.
Turnbull Chris D. Stockley James A. Madathil Shyam Huq Syed S. A. Cooper Brendan G. Ali Asad Wharton Simon Stradling John R. Heitmar Rebekka 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(7):2129-2139
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases.... 相似文献
2.
3.
4.
Vacuum-assisted closure (VAC), although a modern adjunct in wound management, has not been used previously in pyoderma gangrenosum (PG), probably to avoid the potential complications of ‘pathergy’. We would like to report our experience of VAC in three cases of PG with the relevant review of literature. 相似文献
5.
A. G. G. Lødeng C. Ahlén H. Lysvand L. H. Mandal O. J. Iversen 《Clinical microbiology and infection》2006,12(8):761-768
This report describes a new PCR-based assay for the detection of Pseudomonas aeruginosa genotype D in occupational saturation diving systems in the North Sea. This genotype has persisted in these systems for 11 years (1993-2003) and represents 18% of isolates from infections analysed during this period. The new PCR assay was based on sequences obtained after randomly amplified polymorphic DNA (RAPD)-PCR analysis of a group of isolates related to diving that had been identified previously by pulsed-field gel electrophoresis (PFGE). The primer set for the D genotype targets a gene that codes for a hypothetical class 4 protein in the P. aeruginosa PAO1 genome. A primer set able to detect P. aeruginosa at the species level was also designed, based on the 23S-5S rDNA spacer region. The two assays produced 382-bp and 192-bp amplicons, respectively. The PCR assay was evaluated by analysing 100 P. aeruginosa isolates related to diving, representing 28 PFGE genotypes, and 38 clinical and community P. aeruginosa isolates and strains from other species. The assay identified all of the genotype D isolates tested. Two additional diving-relevant genotypes (TP2 and TP27) were also identified, as well as three isolates of non-diving origin. It was concluded that the new PCR assay is a useful tool for early detection and prevention of infections with the D genotype. 相似文献
6.
7.
8.
A gradual reduction in cell-mediated immunity is thought to occur with the progression of human immunodeficiency virus (HIV) infection. This suggests a selective attrition of the Th1 subset. The regulation of the soluble form of the low-affinity receptor for IgE (sCD23) by the opposing actions of interleukin-4 (IL-4) and interferon-gamma (IFN-gamma) allows the assessment of the overall balance of Th1 to Th2 activity in a given disease. In order to investigate this further we employed an enhanced chemiluminescent ELISA to analyse serum levels of sCD23 in male subjects with and without HIV infection. Serum levels of sCD23 were similar in 34 HIV seronegative homosexuals, 39 homosexuals with asymptomatic HIV infection, 27 homosexuals with acquired immune deficiency syndrome (AIDS) and 20 healthy controls. This suggests that HIV has no predilection for either the Th1 or Th2 subsets of CD4 T cells. 相似文献
9.
Spontaneous gall bladder perforation in infants is rare. We report a 3-month-old male infant who presented with progressive abdominal distension, low-grade fever, bilateral hydrocele and acholic stools. Ultrasonography showed free fluid in the peritoneal cavity, which was bile-stained on paracentesis. Surgical exploration revealed sterile biliary peritonitis and a gangrenous gall bladder. Partial cholecystectomy with external biliary drainage resulted in satisfactory recovery. 相似文献
10.