首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   12016篇
  免费   682篇
  国内免费   109篇
耳鼻咽喉   151篇
儿科学   232篇
妇产科学   322篇
基础医学   1511篇
口腔科学   448篇
临床医学   958篇
内科学   3071篇
皮肤病学   149篇
神经病学   1002篇
特种医学   481篇
外科学   1978篇
综合类   37篇
预防医学   523篇
眼科学   126篇
药学   742篇
中国医学   32篇
肿瘤学   1044篇
  2024年   8篇
  2023年   89篇
  2022年   238篇
  2021年   414篇
  2020年   228篇
  2019年   348篇
  2018年   419篇
  2017年   282篇
  2016年   340篇
  2015年   404篇
  2014年   608篇
  2013年   672篇
  2012年   984篇
  2011年   1010篇
  2010年   543篇
  2009年   522篇
  2008年   803篇
  2007年   813篇
  2006年   681篇
  2005年   676篇
  2004年   681篇
  2003年   547篇
  2002年   433篇
  2001年   90篇
  2000年   78篇
  1999年   87篇
  1998年   81篇
  1997年   79篇
  1996年   62篇
  1995年   53篇
  1994年   62篇
  1993年   54篇
  1992年   43篇
  1991年   47篇
  1990年   40篇
  1989年   38篇
  1988年   42篇
  1987年   33篇
  1986年   27篇
  1985年   16篇
  1984年   16篇
  1983年   13篇
  1982年   10篇
  1981年   8篇
  1980年   7篇
  1979年   9篇
  1975年   10篇
  1974年   7篇
  1973年   10篇
  1969年   7篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
63.
64.
The role of moderate alcohol consumption in the evolution of NAFLD is still debated. The aim of this study is to evaluate the impact of current and lifelong alcohol consumption in patients with NAFLD. From 2015 to 2020, we enrolled 276 consecutive patients fulfilling criteria of NAFLD (alcohol consumption up to 140 g/week for women and 210 g/week for men). According to their current alcohol intake per week, patients were divided in: abstainers, very low consumers (C1: <70 g/week) and moderate consumers (C2). We created a new tool, called LACU (Lifetime Alcohol Consuming Unit) to estimate the alcohol exposure across lifetime: 1 LACU was defined as 7 alcohol units per week for 1 drinking year. Patients were divided into lifelong abstainers and consumers and the latter furtherly divided into quartiles: Q1-Q4. Stratification according to alcohol intake, both current and cumulative as estimated by LACU, showed that very low consumers (C1 and Q1-Q3) displayed lower frequency of cirrhosis and hepatocellular carcinoma compared to abstainers and moderate consumers (C2 and Q4). We can speculate that up to one glass of wine daily in the context of a Mediterranean diet may be a long-term useful approach in selected NAFLD patients.  相似文献   
65.
66.
67.
Aimslymphadenopathy can occur after COVID-19 vaccination and when encountered at ultrasound examinations performed for other reasons might pose a diagnostic challenge. Purpose of the study was to evaluate the incidence, course and ultrasound imaging features of vaccine-induced lymphadenopathy.Methods89 healthy volunteers (median age 30, 76 females) were prospectively enrolled. Vaccine-related clinical side effects (e.g., fever, fatigue, palpable or painful lymphadenopathy) were recorded. Participants underwent bilateral axillary, supraclavicular and cervical lymph node stations ultrasound 1–4 weeks after the second dose and then again after 4–12 weeks in those who showed lymphadenopathy at the first ultrasound. B-mode, color-Doppler assessment, and shear-wave elastography (SWE) evaluation were performed. The correlation between lymphadenopathy and vaccine-related side effects was assessed using the Fisher’s exact test.ResultsPost-vaccine lymphadenopathy were found in 69/89 (78%) participants (37 single and 32 multiple lymphadenopathy). Among them, 60 presented vaccine-related side effects, but no statistically significant difference was observed between post-vaccine side effect and lymphadenopathy. Ultrasound features of vaccine-related lymphadenopathy consisted of absence of fatty hilum, round shape and diffuse or asymmetric cortical thickness (median cortical thickness of 5 mm). Vascular signal was mainly found to be increased, localized in both central and peripheral regions. SWE showed a soft cortical consistence in all cases (median value 11 Kpa). At follow-up, lymph-node morphology was completely restored in most cases (54/69, 78%) and in no case lymphadenopathy had worsened.ConclusionA high incidence of vaccine-induced lymphadenopathy was found in a population of healthy subjects, with nearly complete regression within 4–12 weeks.Supplementary InformationThe online version contains supplementary material available at 10.1007/s40477-022-00674-3.  相似文献   
68.
69.
70.
The purpose of the current study was to investigate the role of visual information on gait control in people with Parkinson's disease as they crossed over obstacles. Twelve healthy individuals, and 12 patients with mild to moderate Parkinson's disease, walked at their preferred speeds along a walkway and stepped over obstacles of varying heights (ankle height or half-knee height), under three visual sampling conditions: dynamic (normal lighting), static (static visual samples, similar to stroboscopic lighting), and voluntary visual sampling. Subjects wore liquid crystal glasses for visual manipulation. In the static visual sampling condition only, the patients with Parkinson's disease made contact with the obstacle more often than did the control subjects. In the successful trials, the patients increased their crossing step width in the static visual sampling condition as compared to the dynamic and voluntary visual sampling conditions; the control group maintained the same step width for all visual sampling conditions. The patients showed lower horizontal mean velocity values during obstacle crossing than did the controls. The patients with Parkinson's disease were more dependent on optic flow information for successful task and postural stability than were the control subjects. Bradykinesia influenced obstacle crossing in the patients with Parkinson's disease.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号