全文获取类型
收费全文 | 240812篇 |
免费 | 18099篇 |
国内免费 | 6600篇 |
专业分类
耳鼻咽喉 | 3083篇 |
儿科学 | 3906篇 |
妇产科学 | 4915篇 |
基础医学 | 34136篇 |
口腔科学 | 4738篇 |
临床医学 | 25997篇 |
内科学 | 42616篇 |
皮肤病学 | 5466篇 |
神经病学 | 16474篇 |
特种医学 | 11134篇 |
外国民族医学 | 53篇 |
外科学 | 30262篇 |
综合类 | 12922篇 |
现状与发展 | 26篇 |
一般理论 | 100篇 |
预防医学 | 14805篇 |
眼科学 | 7290篇 |
药学 | 21832篇 |
67篇 | |
中国医学 | 5699篇 |
肿瘤学 | 19990篇 |
出版年
2024年 | 349篇 |
2023年 | 2210篇 |
2022年 | 5930篇 |
2021年 | 8869篇 |
2020年 | 5492篇 |
2019年 | 6416篇 |
2018年 | 7444篇 |
2017年 | 5754篇 |
2016年 | 6782篇 |
2015年 | 9369篇 |
2014年 | 11511篇 |
2013年 | 12389篇 |
2012年 | 18637篇 |
2011年 | 18702篇 |
2010年 | 11205篇 |
2009年 | 9097篇 |
2008年 | 13384篇 |
2007年 | 13084篇 |
2006年 | 12483篇 |
2005年 | 11936篇 |
2004年 | 9795篇 |
2003年 | 8622篇 |
2002年 | 7376篇 |
2001年 | 6140篇 |
2000年 | 5775篇 |
1999年 | 5296篇 |
1998年 | 2592篇 |
1997年 | 2250篇 |
1996年 | 1904篇 |
1995年 | 1755篇 |
1994年 | 1511篇 |
1993年 | 1118篇 |
1992年 | 2162篇 |
1991年 | 2062篇 |
1990年 | 1823篇 |
1989年 | 1645篇 |
1988年 | 1522篇 |
1987年 | 1331篇 |
1986年 | 1257篇 |
1985年 | 1095篇 |
1984年 | 773篇 |
1983年 | 646篇 |
1982年 | 440篇 |
1981年 | 427篇 |
1980年 | 363篇 |
1979年 | 582篇 |
1978年 | 428篇 |
1977年 | 399篇 |
1976年 | 356篇 |
1974年 | 384篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
Clinical clues for differential diagnosis between verruca plana and verruca plana‐like seborrheic keratosis
下载免费PDF全文
![点击此处可从《The Journal of dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Won‐Jeong Kim Won‐Ku Lee Margaret Song Hoon‐Soo Kim Hyun‐Chang Ko Byung‐Soo Kim Moon‐Bum Kim 《The Journal of dermatology》2015,42(4):373-377
Sometimes the clinical differentiation between verruca plana (VP) and VP‐like seborrheic keratosis (SK) could be challenged. However, there have been no studies on this issue to date. The aim of this study was to elucidate clinical and dermoscopic differences between these two diseases, and also to suggest a diagnostic algorithm of VP and VP‐like SK without skin biopsy. The patients who had lesions clinically considered as VP or VP‐like SK were the target of our study. We took clinical and dermoscopic photos with informed consent and conducted a questionnaire. All patients had their diagnoses confirmed by biopsy. Thirty‐three patients were enrolled in our study. Seventeen patients were finally diagnosed with VP (51.5%) and 16 patients with VP‐like SK (48.5%). In clinical findings, VP‐like SK showed significantly more scattered distribution than VP (P = 0.039), which exhibited more clustered or grouped distribution (P = 0.039). In dermoscopic findings, brain‐like appearance was more commonly observed in VP‐like SK (P = 0.003) whereas VP showed more red dots or globular vessels (P = 0.017) and even‐colored light brown to yellow patch (P < 0.001). Sex, onset age, the size of each lesion, location, color and shape showed no significant differences between them (P > 0.05). Based on our results, we suggest a diagnostic algorithm using Koebner's phenomenon, dermoscopic findings, distribution of each lesion and biopsy for multiple VP‐like lesions in adults, and we think it will be a very useful diagnostic tool in daily clinical dermatological practice. 相似文献
92.
93.
94.
Clinical usefulness of intraductal ultrasonography for the management of acute biliary pancreatitis
下载免费PDF全文
![点击此处可从《Journal of gastroenterology and hepatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
95.
Fluid is usually restricted during thoracic surgery, and vasoactive agents are often administered to maintain blood pressure. One-lung ventilation (OLV) decreases arterial oxygenation; thus oxygen delivery to the brain can be decreased. In this study, we compared phenylephrine and dopamine with respect to maintaining cerebral oxygenation during OLV in major thoracic surgery.Sixty-three patients undergoing lobectomies were randomly assigned to the dopamine (D) or phenylephrine (P) group. The patients’ mean arterial pressure was maintained within 20% of baseline by a continuous infusion of dopamine or phenylephrine. Maintenance fluid was kept at 5 mL/kg/h. The depth of anesthesia was maintained with desflurane 1MAC and remifentanil infusion under bispectral index guidance. Regional cerebral oxygen saturation (rScO2) and hemodynamic variables were recorded using near-infrared spectroscopy and esophageal cardiac Doppler.The rScO2 was higher in the D group than the P group during OLV (OLV 60 min: 71 ± 6% vs 63 ± 12%; P = 0.03). The number of patients whose rScO2 dropped more than 20% from baseline was 0 and 6 in the D and P groups, respectively (P = 0.02). The D group showed higher cardiac output, but lower mean arterial pressure than the P group (4.7 ± 1.0 vs 3.9 ± 1.2 L/min; 76.7 ± 8.1 vs 84.5 ± 7.5 mm Hg; P = 0.02, P = 0.02). Among the variables, age, hemoglobin concentration, and cardiac output were associated with rScO2 by correlation analysis.Dopamine was superior to phenylephrine in maintaining cerebral oxygenation during OLV in thoracic surgery. 相似文献
96.
97.
随着对肿瘤热疗和肿瘤免疫微环境(TIME)的深入研究,近年来热疗对TIME的作用越来越受到学者们的重视。本文就目前国内外研究进展,对热疗与TIME中几类主要免疫细胞和免疫相关细胞因子的影响及作用机制作一综述。全面而透彻的了解热疗对TIME的调控作用,有助于为肿瘤治疗提供新的思路和方法。 相似文献
98.
99.
100.
本文报道产前超声诊断胎儿右房异构一例。孕妇孕24周产前超声检查发现胎儿左位心合并复杂心血管畸形(右心室双出口、房室间隔缺损、肺动脉发育不良、双侧上腔静脉、心下型完全型肺静脉异位引流)、胃泡位于腹腔右侧、中位肝、可疑无脾、腹主动脉与下腔静脉位于脊柱左侧、双侧支气管呈右侧支气管对称形态,综合考虑右房异构可能。引产后经尸体解剖证实脾脏发育不良、右房异构。右房异构常合并复杂心血管畸形,因此产前超声发现复杂心血管畸形时,应警惕右房异构的可能。右房异构病死率极高,产前诊断具有重要意义。 相似文献