全文获取类型
收费全文 | 137797篇 |
免费 | 13064篇 |
国内免费 | 8384篇 |
专业分类
耳鼻咽喉 | 1057篇 |
儿科学 | 1820篇 |
妇产科学 | 2193篇 |
基础医学 | 16400篇 |
口腔科学 | 2624篇 |
临床医学 | 16960篇 |
内科学 | 21619篇 |
皮肤病学 | 1533篇 |
神经病学 | 7108篇 |
特种医学 | 5238篇 |
外国民族医学 | 66篇 |
外科学 | 14700篇 |
综合类 | 21654篇 |
现状与发展 | 28篇 |
一般理论 | 27篇 |
预防医学 | 9047篇 |
眼科学 | 3541篇 |
药学 | 14791篇 |
130篇 | |
中国医学 | 7286篇 |
肿瘤学 | 11423篇 |
出版年
2024年 | 426篇 |
2023年 | 1895篇 |
2022年 | 4511篇 |
2021年 | 6683篇 |
2020年 | 4957篇 |
2019年 | 4356篇 |
2018年 | 4694篇 |
2017年 | 4226篇 |
2016年 | 4026篇 |
2015年 | 5921篇 |
2014年 | 7311篇 |
2013年 | 7128篇 |
2012年 | 10417篇 |
2011年 | 11014篇 |
2010年 | 7105篇 |
2009年 | 5708篇 |
2008年 | 7694篇 |
2007年 | 7552篇 |
2006年 | 6936篇 |
2005年 | 6661篇 |
2004年 | 5055篇 |
2003年 | 4633篇 |
2002年 | 4160篇 |
2001年 | 3449篇 |
2000年 | 3450篇 |
1999年 | 3388篇 |
1998年 | 2001篇 |
1997年 | 1988篇 |
1996年 | 1581篇 |
1995年 | 1458篇 |
1994年 | 1230篇 |
1993年 | 789篇 |
1992年 | 1055篇 |
1991年 | 915篇 |
1990年 | 813篇 |
1989年 | 722篇 |
1988年 | 570篇 |
1987年 | 548篇 |
1986年 | 434篇 |
1985年 | 345篇 |
1984年 | 239篇 |
1983年 | 168篇 |
1982年 | 121篇 |
1981年 | 120篇 |
1980年 | 71篇 |
1979年 | 116篇 |
1978年 | 55篇 |
1974年 | 53篇 |
1973年 | 50篇 |
1972年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
加强医疗仪器设备管理提高医疗仪器设备使用效益 总被引:1,自引:0,他引:1
加强医疗设备管理,提高设备使用效益,制定合理的计划,正确选购设备,为医院提供品种、性能、精度适当的技术装备。 相似文献
112.
113.
114.
Qin Lu Jean-Michel Constantin Ania Nieszkowska Marilia Elman Silvia Vieira Jean-Jacques Rouby 《Critical care (London, England)》2006,10(3):R95-10
Introduction
Positive end-expiratory pressure (PEEP)-induced lung derecruitment can be assessed by a pressure–volume (P–V) curve method or by lung computed tomography (CT). However, only the first method can be used at the bedside. The aim of the study was to compare both methods for assessing alveolar derecruitment after the removal of PEEP in patients with acute lung injury or acute respiratory distress syndrome. 相似文献116.
成虹 《世界核心医学期刊文摘》2006,2(3):59-62
颈部食管的异位胃黏膜:是否参与了后壁喉炎患咽喉部反流的发病机制;结肠直肠癌手术联合放疗与单纯手术治疗后的大便失禁患,在盆底运动/生物反馈训练的短期和远期疗效方面的比较:一项临床、功能性及内镜/超声内镜检查的前瞻性对照研究。 相似文献
117.
分析近年来国内高校教育形式的变化,肯定扎实学生基础、培养创新型人才的重要性,结合多年来在工科物理教改中的探索经验和初步成果,提出了深化工科物理教学改革、培养创新型人才的思路和实现途径。 相似文献
118.
Hugo Maia Julio Casoy Tania Correia Luís Freitas Kleber Pimentel Célia Athayde Elsimar Coutinho 《Gynecological endocrinology》2006,22(10):547-551
OBJECTIVES: To determine whether aromatase expression in the eutopic endometrium and adenomyotic foci is affected by previous use of oral contraceptives containing gestodene, and to determine whether changes in cyclooxygenase-2 (COX-2) expression occur in adenomyosis during the menstrual cycle. PATIENT AND METHODS: This was a retrospective cohort study carried out in paraffin-embedded endometrial tissue obtained from patients with a histological diagnosis of adenomyosis obtained during the proliferative (n = 25) and luteal (n = 10) phases of the menstrual cycle and following the use of continuous oral contraception with gestodene/ethinyl estradiol (n = 7). COX-2 and aromatase expression were measured in both eutopic endometrium and adenomyotic foci using immunohistochemical methods. RESULTS: Aromatase expression was detected in 80% of the endometrial slices by immunohistochemistry. In positive cases, aromatase was mainly detected in the stromal cells of the eutopic endometrium, whereas in the adenomyotic foci this expression was negative in the majority of the cases. Oral contraceptives containing gestodene, on the other hand, were effective in suppressing aromatase expression in both eutopic and ectopic endometrium. COX-2 expression was detected by immunohistochemistry in the glandular epithelium of both eutopic endometrium and adenomyotic foci and there were no significant changes in its intensity throughout the menstrual cycle. CONCLUSION: Aromatase expression in the eutopic endometrium and adenomyotic foci is suppressed by oral contraceptives containing gestodene. Increased aromatase activity may be responsible for the persistent COX-2 expression during the luteal phase. 相似文献
119.
120.
Jorge Guardado Carlos Cotrim Otília Sim?es Sofia Almeida Mário Ialá Luís Lopes Hélder Pereira Manuel Carrageta 《Revista portuguesa de cardiologia》2006,25(4):409-415
INTRODUCTION: Transesophageal echocardiography (TEE) has become increasingly useful in the study of patients with suspected pulmonary thromboembolism. OBJECTIVE: The aim of this study was to prospectively evaluate the usefulness of TEE in the study of the distal part of the left pulmonary artery (LPA) as well as the influence of this procedure on total echocardiographic exam duration. METHODOLOGY: A prospective study in two groups of consecutive patients referred for TEE with a one- year interval between evaluation of Group A: 33 patients, 17 male, mean age 54 +/- 24 years, and Group B: 42 patients, 20 male, mean age 48 +/- 27 years (p = NS). The procedure was considered long when it took more than 3 min to evaluate the distal part of the LPA. RESULTS: In group A we were able to visualize the distal part of the LPA in 24 patients (73%) without significant prolongation of total exam duration in 16 patients (48% of group A). In one of the patients with suspected pulmonary thromboembolism thrombi were only observed in the distal part of the LPA. In group B we were able to visualize the distal part of the LPA in 36 patients (86%) without significant prolongation of total exam duration in 26 patients (61% of group B). CONCLUSIONS: 1. Visualization of the distal part of the LPA was possible in more patients, and with TEE time prolongation in less patients, in group B. These differences can be accounted for by the training of the operator in this technique. 2. The importance of visualization of this part of the LPA in guiding treatment in the subset of patients with pulmonary thromboembolism confirms the usefulness of this specific procedure. 相似文献