全文获取类型
收费全文 | 2841篇 |
免费 | 174篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 106篇 |
妇产科学 | 28篇 |
基础医学 | 373篇 |
口腔科学 | 62篇 |
临床医学 | 340篇 |
内科学 | 565篇 |
皮肤病学 | 41篇 |
神经病学 | 191篇 |
特种医学 | 345篇 |
外国民族医学 | 1篇 |
外科学 | 391篇 |
综合类 | 24篇 |
一般理论 | 3篇 |
预防医学 | 156篇 |
眼科学 | 55篇 |
药学 | 136篇 |
中国医学 | 2篇 |
肿瘤学 | 190篇 |
出版年
2021年 | 22篇 |
2020年 | 16篇 |
2019年 | 21篇 |
2018年 | 37篇 |
2017年 | 43篇 |
2016年 | 33篇 |
2015年 | 37篇 |
2014年 | 55篇 |
2013年 | 76篇 |
2012年 | 92篇 |
2011年 | 97篇 |
2010年 | 89篇 |
2009年 | 87篇 |
2008年 | 86篇 |
2007年 | 73篇 |
2006年 | 82篇 |
2005年 | 93篇 |
2004年 | 60篇 |
2003年 | 79篇 |
2002年 | 68篇 |
2001年 | 83篇 |
2000年 | 65篇 |
1999年 | 70篇 |
1998年 | 71篇 |
1997年 | 89篇 |
1996年 | 70篇 |
1995年 | 60篇 |
1994年 | 68篇 |
1993年 | 70篇 |
1992年 | 61篇 |
1991年 | 61篇 |
1990年 | 72篇 |
1989年 | 86篇 |
1988年 | 92篇 |
1987年 | 68篇 |
1986年 | 70篇 |
1985年 | 78篇 |
1984年 | 51篇 |
1983年 | 68篇 |
1982年 | 42篇 |
1981年 | 39篇 |
1980年 | 46篇 |
1979年 | 39篇 |
1978年 | 22篇 |
1977年 | 25篇 |
1976年 | 20篇 |
1975年 | 37篇 |
1974年 | 26篇 |
1973年 | 18篇 |
1971年 | 14篇 |
排序方式: 共有3020条查询结果,搜索用时 31 毫秒
1.
Ophira Salomon Joseph Moisseiev Tamara Vilganski Rima Dardik Shimon Kurtz Eva Shpringer David M Steinberg Nurit Rosenberg 《Blood coagulation & fibrinolysis》2006,17(6):485-488
To determine whether polymorphisms of platelet surface glycoprotein associated with arterial thrombosis are risk factors for branch retinal vein occlusion. A case-control study in which 69 patients with branch retinal vein occlusion and 147 controls who attended the eye clinic for nonvascular complications participated. DNA was extracted from whole blood and analyzed for genotyping of platelet glycoprotein polymorphisms by polymerase chain reactions and specific restricted enzymes. No relationship was found between the four platelet glycoprotein polymorphisms i.e. GPIa C807T, VNTR and Kozak of glycoprotein Ibalpha, the HPA-1 of glycoprotein IIIa and the occurrence of branch retinal vein occlusion. The HPA-2 polymorphism was found in 18 out 60 (30%) patients with branch retinal vein occlusion in comparison with 27 out 142 (19%) of controls, with an estimated odds ratio of 1.8 (95% confidence interval, 0.91-3.65). The four platelet glycoprotein polymorphisms are not risk factors for branch retinal vein occlusion and therefore it seems unnecessary to screen those patients for it. A larger study is required, however, to determine whether HPA-2 is a novel risk factor for branch retinal vein occlusion. 相似文献
2.
Regulation of erythropoietin production 总被引:6,自引:0,他引:6
3.
4.
Preliminary evidence for a role of apolipoprotein E alleles in identifying haemodialysis patients at high vascular risk 总被引:1,自引:0,他引:1
Olmer M; Renucci JE; Planells R; Bouchouareb D; Purgus R 《Nephrology, dialysis, transplantation》1997,12(4):691-693
Conventional risk factors have very low predictive power in identifying
haemodialysis patients at high risk of vascular accidents. A role for
apolipoprotein E isotypes was looked for in a small, but rigorously
defined, cohort of longterm haemodialysis patients. In individuals with
high vascular risk, as identified by higher common carotid intima/media
thickness, we found an excess of apolipoprotein E4 alleles. This
preliminary result requires confirmation in large patient cohorts.
相似文献
5.
6.
7.
Lymphangiomatosis is a rare disorder of the lymphatic system that is known to cause chylothorax. Chyloptysis may occur but chylous bronchial cast formation is rare. A case is reported of lymphangiomatosis in a 34 year old woman whose initial manifestation was cough productive of bronchial casts. Two years later the patient developed a chylothorax. Ligation of the thoracic duct through a low thoracotomy was curative. 相似文献
8.
9.
10.
Hodgkin disease: CT of the thymus 总被引:2,自引:0,他引:2
The computed tomography (CT) scans in two groups of patients with Hodgkin disease were reviewed to determine the frequency of thymic enlargement. In 50 CT scans from 50 patients with evidence of thoracic disease on CT scans who were examined for primary staging, the thymus was enlarged in 15 of 50 (30%). Fifty CT scans were obtained from 44 patients at the time of 50 separate episodes of known or suspected relapse. Relapse occurred in the mediastinum in 12 episodes, lung parenchyma in five, and both sites in one. Thymic enlargement thought to be due to involvement by disease was present in seven of 18 (38%). Mediastinal disease was associated with thymic enlargement in all but one patient in whom a thymic cyst developed after radiation therapy. Differentiation of thymic enlargement from enlarged superior mediastinal lymph nodes was easily made in all but two patients. Thymic enlargement in the absence of lymph node enlargement may indicate a different disease, since isolated Hodgkin disease of the thymus is uncommon. Primary thymic tumor should be considered initially, whereas after treatment, rebound hyperplasia of the thymus may be the cause of enlargement. 相似文献