全文获取类型
收费全文 | 2367465篇 |
免费 | 187628篇 |
国内免费 | 4637篇 |
专业分类
耳鼻咽喉 | 33144篇 |
儿科学 | 80014篇 |
妇产科学 | 66833篇 |
基础医学 | 337098篇 |
口腔科学 | 64499篇 |
临床医学 | 212028篇 |
内科学 | 469135篇 |
皮肤病学 | 53520篇 |
神经病学 | 191390篇 |
特种医学 | 92102篇 |
外国民族医学 | 1051篇 |
外科学 | 358994篇 |
综合类 | 53927篇 |
现状与发展 | 4篇 |
一般理论 | 782篇 |
预防医学 | 184753篇 |
眼科学 | 53711篇 |
药学 | 171707篇 |
3篇 | |
中国医学 | 5053篇 |
肿瘤学 | 129982篇 |
出版年
2019年 | 18242篇 |
2018年 | 26064篇 |
2017年 | 19737篇 |
2016年 | 22053篇 |
2015年 | 24796篇 |
2014年 | 34968篇 |
2013年 | 52641篇 |
2012年 | 71935篇 |
2011年 | 76298篇 |
2010年 | 45204篇 |
2009年 | 43022篇 |
2008年 | 71447篇 |
2007年 | 76063篇 |
2006年 | 76669篇 |
2005年 | 74534篇 |
2004年 | 71938篇 |
2003年 | 68942篇 |
2002年 | 67252篇 |
2001年 | 116511篇 |
2000年 | 119997篇 |
1999年 | 100917篇 |
1998年 | 28161篇 |
1997年 | 25418篇 |
1996年 | 25795篇 |
1995年 | 24508篇 |
1994年 | 22617篇 |
1993年 | 21154篇 |
1992年 | 77987篇 |
1991年 | 75303篇 |
1990年 | 72748篇 |
1989年 | 69363篇 |
1988年 | 63788篇 |
1987年 | 62565篇 |
1986年 | 58431篇 |
1985年 | 55895篇 |
1984年 | 42376篇 |
1983年 | 35742篇 |
1982年 | 21339篇 |
1981年 | 19156篇 |
1979年 | 37732篇 |
1978年 | 26440篇 |
1977年 | 22129篇 |
1976年 | 20846篇 |
1975年 | 22064篇 |
1974年 | 26181篇 |
1973年 | 25272篇 |
1972年 | 23456篇 |
1971年 | 21286篇 |
1970年 | 20219篇 |
1969年 | 18484篇 |
排序方式: 共有10000条查询结果,搜索用时 558 毫秒
991.
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
992.
993.
In der Behandlung von Frakturen spielt die Analgesie eine wesentliche Rolle. Es stellt sich daher die Frage, ob in der Klinik h?ufig eingesetzte Analgetika wie Tramadol oder Diclofenac negative Wirkungen auf die Knochenbruchheilung haben. 相似文献
994.
Erythropoietin production in healthy volunteers subjected to controlled hypobaric hypoxia: further evidence against a role for adenosine 总被引:2,自引:2,他引:0
Aims Objective of this study was to investigate whether adenosine modulates renal erythropoietin production.
Methods In the present study erythropoietin production was stimulated by hypobaric hypoxia by subjecting healthy volunteers to a simulated altitude of 4000 m in a low pressure chamber for 5.5 h. During exposure to hypoxia the subjects received i.v. in a randomized, single-blind, cross-over fashion the non-specific adenosine antagonist theophylline, the adenosine reuptake inhibitor dipyridamole and placebo.
Results Contrary to the working hypothesis, theophylline did not decrease and dipyridamole did not further boost erythropoietin concentrations.
Conclusions The results are in agreement with our earlier study using haemorrhage as a controlled physiological stimulus of erythropoietin production, and would question a major role for adenosine as a mediator of renal erythropoietin production. 相似文献
Methods In the present study erythropoietin production was stimulated by hypobaric hypoxia by subjecting healthy volunteers to a simulated altitude of 4000 m in a low pressure chamber for 5.5 h. During exposure to hypoxia the subjects received i.v. in a randomized, single-blind, cross-over fashion the non-specific adenosine antagonist theophylline, the adenosine reuptake inhibitor dipyridamole and placebo.
Results Contrary to the working hypothesis, theophylline did not decrease and dipyridamole did not further boost erythropoietin concentrations.
Conclusions The results are in agreement with our earlier study using haemorrhage as a controlled physiological stimulus of erythropoietin production, and would question a major role for adenosine as a mediator of renal erythropoietin production. 相似文献
995.
996.
997.
A. Heinig S. H. Heywang-Köbrunner P. Viehweg D. Lampe J. Buchmann R. P. Spielmann 《Der Radiologe》1997,37(9):710-717
Summary
Early recognition of recurrence and work-up of clinically indeterminate lesions may be impaired after reconstruction with
silicone implants due to superimposition of the implant or to scarring. This study was undertaken to evaluate the use of contrast-enhanced
MRI in patients with silicone implant after breast cancer. Contrast-enhanded MRI was offered to 169 patients. Comparative
two- to three-view mammography was also performed in 169 patients, as well as comparative sonography in 144 patients. Conventional
imaging and clinical examination detected only 8/13 recurrences, whereas 12/13 were detected by MRI. One recurrence had been
visible as a strongly enhancing 2-mm dot in a previous examination (2 years before), but was not called. It was therefore
counted as false negative. In addition, multicentricity was detected by MRI alone in two of three cases. MRI correctly diagnosed
scar tissue in all cases with indeterminate findings. However, due to false-positive calls caused by enhancing granulomas
specificity could not be improved. Contrast-enhanded MRI allowed decisive additional information in our study group and improved
the sensitivity significantly (concerning all diagnoses). Contrast-enhanded MRI is recommended in patients with diagnostic
problems or high risk of recurrence after silicone implants.
相似文献
998.
999.
采用荧光法测定负载Fura-2/AM大脑皮层突触体内游离钙「Ca^2+」i浓度大鼠感染性脑损伤中的变化及其意义。 相似文献
1000.