全文获取类型
收费全文 | 46771篇 |
免费 | 2229篇 |
国内免费 | 389篇 |
专业分类
耳鼻咽喉 | 476篇 |
儿科学 | 1024篇 |
妇产科学 | 504篇 |
基础医学 | 6162篇 |
口腔科学 | 803篇 |
临床医学 | 2783篇 |
内科学 | 12061篇 |
皮肤病学 | 1042篇 |
神经病学 | 3530篇 |
特种医学 | 1830篇 |
外科学 | 8171篇 |
综合类 | 189篇 |
一般理论 | 7篇 |
预防医学 | 1197篇 |
眼科学 | 1182篇 |
药学 | 3086篇 |
中国医学 | 180篇 |
肿瘤学 | 5162篇 |
出版年
2023年 | 225篇 |
2022年 | 427篇 |
2021年 | 940篇 |
2020年 | 505篇 |
2019年 | 703篇 |
2018年 | 974篇 |
2017年 | 741篇 |
2016年 | 944篇 |
2015年 | 1025篇 |
2014年 | 1317篇 |
2013年 | 1664篇 |
2012年 | 2688篇 |
2011年 | 2983篇 |
2010年 | 1686篇 |
2009年 | 1554篇 |
2008年 | 2798篇 |
2007年 | 3028篇 |
2006年 | 3068篇 |
2005年 | 3069篇 |
2004年 | 3203篇 |
2003年 | 3198篇 |
2002年 | 3185篇 |
2001年 | 610篇 |
2000年 | 550篇 |
1999年 | 672篇 |
1998年 | 813篇 |
1997年 | 670篇 |
1996年 | 622篇 |
1995年 | 537篇 |
1994年 | 481篇 |
1993年 | 513篇 |
1992年 | 389篇 |
1991年 | 350篇 |
1990年 | 299篇 |
1989年 | 297篇 |
1988年 | 306篇 |
1987年 | 237篇 |
1986年 | 195篇 |
1985年 | 214篇 |
1984年 | 193篇 |
1983年 | 154篇 |
1982年 | 139篇 |
1981年 | 160篇 |
1980年 | 143篇 |
1979年 | 103篇 |
1978年 | 112篇 |
1977年 | 87篇 |
1976年 | 74篇 |
1975年 | 66篇 |
1969年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
多排螺旋CT在乳腺癌术前评估中的应用 总被引:3,自引:0,他引:3
多排螺旋CT的出现为乳腺癌诊断评估提供了一个全新的工具。本文旨在介绍乳腺多排螺旋CT高分辨率薄层增强扫描和相应之图像重建技术路线,及其在乳腺癌术前诊断评估中的作用与意义。 相似文献
33.
D Akagi H Arita T Komiyama S Ishii K Shigematsu H Nagawa T Miyata 《European journal of vascular and endovascular surgery》2007,33(5):625-630
AIM: The complication of nerve injury after greater saphenous vein stripping for varicosity is subjective, and a method for objective evaluation has never been established. The aim of this study was to evaluate postoperative sensory changes by quantitative assessment of current perception threshold (CPT), and to clarify the relation between CPT and symptoms. PATIENTS AND METHODS: Between January 2003 and August 2005, 27 limbs in 18 patients were enrolled. Quantitative sensory function was determined through CPT using a Neurometer (Neurotron, Inc., USA), with which saphenous nerve neural fiber selective minimum sensing values against three electrical stimuli (2000, 250, 5 Hz) were measured. CPT measurements were scheduled on the day before the operation, and 2-7 days, 1, 3, and 6 months after the operation. RESULTS: An increase in CPT value of more than 20% or decrease to below 50% compared to the preoperative value with at least two stimuli was defined as CPT abnormality. Subjective symptoms were observed in 13 limbs in the early postoperative period, and 10 limbs showed CPT abnormality. In 6 limbs with a CPT increase over 20% with all three stimuli, neurological symptoms continued for 6 months. CONCLUSIONS: CPT evaluation provides an objective indication of neurological symptoms in the lower limb following varicose vein surgery. 相似文献
34.
Tatsurou Tanaka Yasuhiro Morimoto Hiroshi Takano Kazuhiro Tominaga Shinji Kito Sachiko Okabe Tetsu Takahashi Jin-ichi Fukuda Takeshi Ohba 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2005,100(5):609-613
OBJECTIVE: To evaluate a proposed technique for the 3-dimensional (3D) detection of hemangiomas, including vascular malformation and their feeding arteries, in the head and neck. The new technique combines phase-contrast magnetic resonance angiography (PCMRA) without contrast medium and 3D fast asymmetric spin-echo (FASE) sequences. METHODS: The technique was applied to 3 patients having hemangiomas in the head and neck region. In 1 patient the image obtained with the proposed technique was compared to that obtained by standard contrast angiography. RESULTS: In all 3 patients, the 3D presence of the hemangiomas and the feeding arteries were well defined in images created by the proposed technique. Additionally, the characterization of the hemangioma's 3D structure and distribution of the feeding arteries coincided with those observed using contrast angiography in the case for which contrast angiography was also performed. CONCLUSIONS: Preliminary experience shows that the proposed technique combining 3D-FASE and 3D-PCMRA is useful to visualize both the 3D structure of hemangiomas and to identify the 3D distribution of the feeding arteries without using contrast medium. 相似文献
35.
36.
Daisuke Kubota Takanori Kanai Fumiro Yui Tomoko Matsumoto Takahiro Kawamura Yasuhiro Itsui Eriko Okada Seishin Chin Shinya Ooka Masakazu Nagahori Kiichiro Tsuchiya Akihiro Araki Naoya Sakamoto Tatsuya Miyata Mamoru Watanabe 《Nihon Shokakibyo Gakkai zasshi》2007,104(1):42-46
A 44-year-old women developed marked myopathy one year earlier, when she was treated with intravenous prednisolone for acute severe exacerbation of ulcerative colitis. When she was admitted to our hospital for another severe exacerbation, intravenous cyclosporine A was administered as monotherapy because she could not tolerate corticosteroid. The treatment was successful and she obtained complete remission. Cyclosporine A monotherapy is considered to be a valuable alternative to proctocolectomy for severe ulcerative colitis patients who cannot tolerate corticosteroid. 相似文献
37.
Ke-Xiang Liu Fumio Yamamoto Hiroshi Yamamoto Tiance Wang Zhicheng Zhu Rihao Xu Shudong Zhang 《Annals of thoracic and cardiovascular surgery》2007,13(5):301-307
OBJECTIVES: We investigated whether the Na+-H+ exchange inhibitor, HOE642 (Hoe), and/or the Na channel blocker, mexiletine (Mex), enhance a cardioprotective effect on St. Thomas' Hospital cardioplegic solution (STS) to clarify the mechanism by which intracellular Na+ is accumulated after cardioplegic arrest. MATERIALS AND METHODS: Isolated working rat hearts were perfused with Krebs-Henseleit bicarbonate buffer (KHBB). The hearts were then arrested with STS and subjected to normothermic global ischemia (30 min). This was followed by Langendorff reperfusion (15 min) and then a working reperfusion (20 min). In study A, we added Hoe (5, 10, and 20 microM), Mex (70 microM), or a combination of Hoe (20 microM) and Mex (70 microM), to STS. In study B, we added Hoe (20 microM), Mex (70 microM), or a combination of Hoe (20 microM) and Mex (70 microM) to KHBB during the first 3 min of Langendorff reperfusion. RESULTS: In study A, the addition of Hoe (10 and 20 microM) to STS showed a significantly greater postischemic recovery of cardiac output compared to the control group [63.1+/-5.7% (10 microM), 62.7+/-4.7% (20 microM), and 55.5+/-4.6% (control), respectively]. The postischemic recovery of cardiac output was significantly greater in the group of the combined addition (Hoe and Mex) to STS than that in the control, 20 microM Hoe, 70 microM Mex groups [70.3+/-3.7 (Hoe and Mex), 55.5+/-4.6% (control), 62.7+/-4.7% (Hoe 20 microM), and 60.2+/-4.7% (Mex 70 microM), respectively]. The myocardial water content in the postischemic period was 565.1+/-29.1, 525.8+/-2.9, 509.4+/-19.6, and 532.2+/-20.1; it was 497.3+/-9.1 mL/100 g dry weight in the control; and 10 microM Hoe, 20 microM Hoe, and 70 microM Mex in the combined use groups. In study B, there was no significant difference in the postischemic recovery of cardiac output in all experimental groups. CONCLUSION: The combined use of the Na+-H+ exchange inhibitor and Na+ channel blocker during cardioplegia may achieve a superior cardioprotective effect on myocardial damage because of ischemia and reperfusion. 相似文献
38.
39.
40.
Keijiro Sunada Hironori Yamamoto Hiroto Kita Tomonori Yano Tomohiko Miyata Yutaka Sekine Akiko Kuno Nobuki Onishi Michiko Iwamoto Atsuhiro Sasaki Kenichi Ido Kentaro Sugano 《Digestive endoscopy》2004,16(3):237-240
The requirement for endoscopic access to a stricture is a major limitation of the endoscopic dilatation for the treatment of strictures in the gastrointestinal tract. We have developed the double‐balloon enteroscopy method that enables visualization of the entire small bowel. In addition, double‐balloon enteroscopy has a potential for the interventional therapy including dilatation of strictures. We present here a case of jejunal strictures in a 47‐year‐old woman with Crohn's disease successfully treated with a balloon catheter in combination with double‐balloon enteroscopy. Balloon dilation with double‐balloon enteroscopy is a promising method for the treatment of small bowel strictures in Crohn's disease. 相似文献