全文获取类型
收费全文 | 28507篇 |
免费 | 1726篇 |
国内免费 | 174篇 |
专业分类
耳鼻咽喉 | 358篇 |
儿科学 | 1115篇 |
妇产科学 | 810篇 |
基础医学 | 3490篇 |
口腔科学 | 969篇 |
临床医学 | 2698篇 |
内科学 | 5823篇 |
皮肤病学 | 640篇 |
神经病学 | 2296篇 |
特种医学 | 1107篇 |
外国民族医学 | 4篇 |
外科学 | 4238篇 |
综合类 | 670篇 |
现状与发展 | 1篇 |
一般理论 | 29篇 |
预防医学 | 2045篇 |
眼科学 | 532篇 |
药学 | 1856篇 |
4篇 | |
中国医学 | 193篇 |
肿瘤学 | 1529篇 |
出版年
2023年 | 278篇 |
2022年 | 621篇 |
2021年 | 1048篇 |
2020年 | 650篇 |
2019年 | 765篇 |
2018年 | 1021篇 |
2017年 | 689篇 |
2016年 | 795篇 |
2015年 | 933篇 |
2014年 | 1202篇 |
2013年 | 1487篇 |
2012年 | 2030篇 |
2011年 | 1941篇 |
2010年 | 1128篇 |
2009年 | 1001篇 |
2008年 | 1456篇 |
2007年 | 1592篇 |
2006年 | 1452篇 |
2005年 | 1400篇 |
2004年 | 1336篇 |
2003年 | 1195篇 |
2002年 | 1051篇 |
2001年 | 514篇 |
2000年 | 483篇 |
1999年 | 425篇 |
1998年 | 208篇 |
1997年 | 178篇 |
1996年 | 133篇 |
1995年 | 124篇 |
1994年 | 121篇 |
1993年 | 106篇 |
1992年 | 278篇 |
1991年 | 219篇 |
1990年 | 222篇 |
1989年 | 182篇 |
1988年 | 189篇 |
1987年 | 169篇 |
1986年 | 135篇 |
1985年 | 141篇 |
1984年 | 124篇 |
1983年 | 102篇 |
1982年 | 78篇 |
1979年 | 114篇 |
1978年 | 82篇 |
1977年 | 70篇 |
1974年 | 89篇 |
1973年 | 106篇 |
1972年 | 66篇 |
1971年 | 66篇 |
1970年 | 64篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Lalia Y. Ibrahim Krank P. DiFilippo Geremy E. Steed Manuel D. Cerqueira 《Journal of nuclear cardiology》2006,13(6):855-866
Conclusion Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve
high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed
to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially
if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable
problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the
available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality
control to obtain the best possible images. 相似文献
3.
周围性面瘫,多是由面神经炎引起面神经缺血、水肿导致的面肌瘫痪[1].笔者近年在沙特阿拉伯工作期间,有感于面部按摩疗法在周围性面瘫康复中的广泛应用,以面部游走火罐配合针灸疗法治疗本病35例,均取得了较好的疗效.现总结如下. 相似文献
4.
Rènée du Toit Katherine Soong Garry Brian Jacqueline Ramke 《Optometry and vision science》2006,83(8):582-588
PURPOSE: The advantages of a focometer (FOCOMETER) over other methods of refraction for use in developing countries are that it is lightweight, compact, relatively inexpensive, fairly quick, and easy to use with minimal training. This clinical trial compared the repeatability, validity, and ease of use of the focometer with an autorefractor. METHODS: The refractive status of the right eye of 80 participants was determined with an autorefractor (Canon RK3). Three measurements were also taken with the focometer. RESULTS: The spherical equivalent (M) of the focometer was 0.25 D more positive than the autorefractor (p < 0.001) and 84% of measurements were within 0.75 D of the autorefractor. The autorefractor detected astigmatism in 91% (73) of the eyes, whereas the focometer identified only 32% (26). The design of the clock target restricts cylinder axis accuracy to the nearest 15 degrees . There was evidence of a learning effect for the focometer: the second and third measurements were more repeatable in the untrained group. There were no differences between the mean (1.03 +/- 2.28) and third focometer (-1.05 +/- 2.32) measurements (p = 0.34). However, using the third focometer measurement, 94% of participants had visual acuities of at least 6/12(-2). CONCLUSIONS: This study highlighted the focometer's restricted power range, inaccuracy of astigmatism and axis determination, and dependence on subject understanding and compliance. Therefore, in most clinical settings, the focometer would not be adequate for quantifying refractive error, but the focometer spherical equivalent was within acceptable limits of the autorefractor, and the visual acuity with lenses determined by the focometer indicates its potential usefulness in public health settings, especially where only spherical ready-made spectacles are dispensed. There may be more cost-effective ways to determine refractive error in these circumstances. A potentially important enhancement in focometer methodology that improves its ease of use was identified: use only the third measurement for each eye. 相似文献
5.
o. goetze a. b. nikodem j. wiezcorek † m. banasch h. przuntek † t. mueller † w. e. schmidt & d. woitalla † 《Neurogastroenterology and motility》2006,18(5):369-375
Predictors of gastric emptying (GE) in patients with idiopathic Parkinson's disease (PD) of a solid and liquid meal are not well defined. For measurement of GE 80 patients with PD were randomly assigned to receive either a solid meal (250 kcal) containing 13C-octanoate (n = 40) or a liquid meal (315 kcal) with 13C-acetate (n = 40). All patient groups were off medication affecting motility and were matched for age, gender, body mass index, disease duration and severity, using Unified Parkinson's Disease Rating Scale (UPDRS). Gastric emptying was compared with a healthy control group (n = 40). Multiple regression analysis was used to determine predictors of gastric emptying. Exactly 88% and 38% of PD patients had delayed GE of solids and liquids respectively. Solid and liquid emptying was similar in women and men. There were no differences in GE in PD patients < 65 years of age when compared with patients > or = 65 years. Multiple regression analysis showed that motor handicaps such as rigour and action tremor are independent predictors of solid GE (r = 0.68, P < 0.001). The severity of motor impairment, but not any other neurological symptom, as assessed by UPDRS is associated with gastroparesis in PD and solid emptying is more likely to be delayed. 相似文献
6.
Yaprak Engin-Ustün Yusuf Ustün M Mutlu Meydanli Ay?e Kafkasli 《Gynecological endocrinology》2006,22(12):676-679
AIM: To compare the effects of 17beta-estradiol given intranasally (intranasal E2) and raloxifene on serum lipid profile and fibrinogen in hypercholesterolemic postmenopausal women. METHODS: The study population consisted of 46 women after menopause. The placebo group (n = 11) was given calcium, while the intervention groups were given intranasal E2 (Aerodiol; Servier, Chambray-les-Tours, France) (n = 16) or raloxifene (Evista; Lilly SA, Madrid, Spain) (n = 19). Blood lipids and fibrinogen were compared between groups at baseline and after 3 months of treatment. RESULTS: The group receiving intranasal E2 showed a significant decrease in triglyceride levels (p<0.05) and a marked increase in high-density lipoprotein cholesterol levels (p<0.05). No changes in lipid profile were observed in the raloxifene and placebo groups. Raloxifene caused a significant decrease in fibrinogen levels (p<0.05). CONCLUSION: Intranasal E2 exerts significant effects on lipid profile in hypercholesterolemic postmenopausal women. Raloxifene has a greater impact on fibrinogen than intranasal E2 application. 相似文献
7.
B. J. d'Othe S. Haulon C. Mounier-Vehier J. P. Beregi O. Jabourek S. Willoteaux 《European journal of vascular and endovascular surgery》2002,24(6):516-523
OBJECTIVE: evaluation and comparison of the endovascular treatment of isolated aortic and aortoiliac atherosclerotic lesions (stenoses and occlusions). METHODS: a percutaneous endovascular procedure was performed in 52 patients (38 men and 14 women) with a mean age of 52 years (range, 25-85 years). The baseline angiogram showed 35 aortic lesions (31 stenoses, 4 occlusions) and 17 aortoiliac lesions (14 stenoses, 3 occlusions). Percutaneous techniques used in this series included variable combinations of transluminal angioplasty and stenting. All stents placements were performed over-the-wire using the transfemoral route (most often bilateral approach). Clinical examination and Duplex-scan were performed at discharge, 1 month, 6 months, 12 months, and then yearly. RESULTS: technical success was 100% for aortic and aortoiliac lesions. Angiographic success rates were comparable for aortic (91%) and aortoiliac (94%) lesions. No death occurred during or early after the endovascular intervention. Duplex-scan confirmed 100% patency rate at discharge. There was no significant difference between the aortic (94%) and aortoiliac (96%) groups regarding immediate clinical improvement. Mean follow-up was 34+/-31 months (range, 0-130 months). The cumulative primary patency rate at 36 months was 85% in the aortic group and 86% in the aortoiliac group. Clinical success, defined as a symptom-free status at the end of follow-up, was also similar in both groups. CONCLUSION: endovascular treatment of isolated aortic lesions of the infra-renal aorta has favorable outcomes comparable to those of aortoiliac lesions. 相似文献
8.
9.
10.
Eric Racine Marie-Josée Dion Christine A. C. Wijman Judy Illes Maarten G. Lansberg 《Neurocritical care》2009,11(3):345-352