全文获取类型
收费全文 | 2374篇 |
免费 | 127篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 103篇 |
妇产科学 | 36篇 |
基础医学 | 173篇 |
口腔科学 | 58篇 |
临床医学 | 235篇 |
内科学 | 453篇 |
皮肤病学 | 21篇 |
神经病学 | 128篇 |
特种医学 | 280篇 |
外科学 | 460篇 |
综合类 | 32篇 |
预防医学 | 68篇 |
眼科学 | 85篇 |
药学 | 110篇 |
中国医学 | 1篇 |
肿瘤学 | 271篇 |
出版年
2023年 | 11篇 |
2021年 | 24篇 |
2020年 | 11篇 |
2019年 | 17篇 |
2018年 | 25篇 |
2017年 | 15篇 |
2016年 | 19篇 |
2015年 | 31篇 |
2014年 | 50篇 |
2013年 | 40篇 |
2012年 | 108篇 |
2011年 | 97篇 |
2010年 | 80篇 |
2009年 | 55篇 |
2008年 | 77篇 |
2007年 | 116篇 |
2006年 | 121篇 |
2005年 | 124篇 |
2004年 | 88篇 |
2003年 | 109篇 |
2002年 | 102篇 |
2001年 | 98篇 |
2000年 | 87篇 |
1999年 | 63篇 |
1998年 | 73篇 |
1997年 | 83篇 |
1996年 | 93篇 |
1995年 | 57篇 |
1994年 | 50篇 |
1993年 | 53篇 |
1992年 | 56篇 |
1991年 | 38篇 |
1990年 | 44篇 |
1989年 | 58篇 |
1988年 | 67篇 |
1987年 | 50篇 |
1986年 | 36篇 |
1985年 | 43篇 |
1984年 | 16篇 |
1983年 | 18篇 |
1982年 | 14篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1978年 | 7篇 |
1977年 | 14篇 |
1976年 | 13篇 |
1975年 | 11篇 |
1974年 | 6篇 |
1971年 | 7篇 |
1970年 | 8篇 |
排序方式: 共有2537条查询结果,搜索用时 15 毫秒
1.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome. 相似文献
2.
3.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
4.
A R Dias R N Melo O C E Gebara E A D'Amico A Nussbacher H W Halbe J A Pinotti 《Climacteric》2005,8(1):63-70
OBJECTIVES: To compare the effect of conjugated equine estrogens (CEE) and raloxifene on lipid profile and hemostasis. MATERIALS AND METHODS: A double-blind, randomized and parallel study was performed with 90 healthy postmenopausal women, aged 54 +/- 5 years, divided into three groups and submitted to daily therapy with either CEE 0.625 mg, raloxifene 60 mg or placebo for 4 months. The lipid profile, coagulation and fibrinolytic factors were analyzed. RESULTS: CEE increased the levels of high density lipoprotein cholesterol (HDL-C) from 49.0 to 56.8 mg/dl (p < 0.001), very low density lipoprotein cholesterol (VLDL-C) from 17.2 to 22.3 mg/dl (p < 0.001), and triglycerides from 86.0 to 111.7 mg/dl (p < 0.001), and decreased the levels of low density lipoprotein cholesterol (LDL-C) from 121.0 to 106.5 mg/dl (p < 0.001). The only significant effect of raloxifene was an increase in the levels of HDL-C from 46.0 to 47.8 mg/dl (p = 0.019). There was no significant reduction in LDL-C, from 115.5 to 110.2 mg/dl (p = 0.06), VLDL-C, from 21.7 to 20.0 mg/dl (p = 0.201), and triglycerides, from 108 to 100 mg/dl (p = 0.201). CEE decreased the levels of fibrinogen, from 370.5 to 326.8 g/l (p = 0.039) and the levels of antithrombin III, from 99.5 to 93.2% (p < 0.001). Raloxifene decreased the levels of fibrinogen, from 354.7 to 302.0 g/l (p = 0.009) and the levels of antithrombin III, from 102.4 to 98.5% (p = 0.039). CEE increased levels of protein C from 103.7 to 115.3 mg/l (p < 0.001) and raloxifene did not change the levels of protein C (107.9 to 105.1 mg/l; p = 0.158). CEE decreased the antigen levels of tissue plasminogen activator (t-PA) from 8.8 to 6.8 U/ml (p < 0.001), and of plasminogen activator inhibitor (PAI-1) from 30.8 to 21.6 U/ml (p < 0.010), whereas raloxifene had no significant effect on either t-PA, from 9.6 to 9.2 U/ml (p = 0.235) or PAI-1 antigen levels, from 32.1 to 30.4 U/ml (p = 0.538). CONCLUSION Both CEE and raloxifene exert significant effects on the lipid and coagulation profile. CEE had a more significant effect on fibrinolysis than raloxifene. These effects may have a significant impact on the cardiovascular risk that needs to be confirmed in larger studies. 相似文献
5.
6.
Giant aneurysm of the pericallosal artery 总被引:1,自引:0,他引:1
A rare case of a giant aneurysm of the pericallosal artery, evaluated by computed tomography, magnetic resonance imaging, and angiography, is reported, and the other 7 cases in the literature are reviewed. Giant aneurysms are exceptional in the distal segments of the anterior cerebral arteries, and may simulate a callosal tumor or hematoma on computed tomographic scan. The clinical, radiological, surgical, and pathological findings of giant aneurysms of this location are discussed and the other reported cases are analyzed. The role of magnetic resonance imaging in diagnosing and characterizing giant aneurysms is stressed. 相似文献
7.
8.
After describing the stages of surgical infection and the efficacy of short-term antibiotic prophylaxis in surgery, the paper reports a trial in which a single dose of Ceftriaxone was administered in 50 cases of cholecystectomy, with excellent results in terms of efficacy and tolerability. 相似文献
9.
10.
Giangennaro Coppola Francesca Felicia Operto Gianfranca Auricchio Alessandra D'Amico Delia Fortunato Antonio Pascotto 《Epileptic Disord》2007,9(2):145-148
A child had the characteristic clinical and EEG pattern of migrating partial seizures in infancy with left temporal lobe atrophy, hippocampal sclerosis and cortical-subcortical blurring.Seizures were drug-resistant, with recurring episodes of status epilepticus. The child developed microcephaly with arrest of psychomotor development. Focal brain lesions, in the context of migrating partial seizures, have not been previously reported.[Published with video sequences]. 相似文献