全文获取类型
收费全文 | 47599篇 |
免费 | 6185篇 |
国内免费 | 909篇 |
专业分类
耳鼻咽喉 | 861篇 |
儿科学 | 2029篇 |
妇产科学 | 546篇 |
基础医学 | 2240篇 |
口腔科学 | 915篇 |
临床医学 | 7959篇 |
内科学 | 5352篇 |
皮肤病学 | 451篇 |
神经病学 | 2651篇 |
特种医学 | 679篇 |
外国民族医学 | 1篇 |
外科学 | 5339篇 |
综合类 | 5253篇 |
现状与发展 | 1篇 |
一般理论 | 23篇 |
预防医学 | 11145篇 |
眼科学 | 414篇 |
药学 | 3129篇 |
72篇 | |
中国医学 | 3834篇 |
肿瘤学 | 1799篇 |
出版年
2024年 | 169篇 |
2023年 | 1254篇 |
2022年 | 1711篇 |
2021年 | 2526篇 |
2020年 | 3441篇 |
2019年 | 2957篇 |
2018年 | 2728篇 |
2017年 | 2403篇 |
2016年 | 2268篇 |
2015年 | 2324篇 |
2014年 | 3724篇 |
2013年 | 4103篇 |
2012年 | 2765篇 |
2011年 | 2987篇 |
2010年 | 2312篇 |
2009年 | 2195篇 |
2008年 | 2189篇 |
2007年 | 2077篇 |
2006年 | 1798篇 |
2005年 | 1372篇 |
2004年 | 1066篇 |
2003年 | 1000篇 |
2002年 | 730篇 |
2001年 | 673篇 |
2000年 | 652篇 |
1999年 | 456篇 |
1998年 | 402篇 |
1997年 | 342篇 |
1996年 | 286篇 |
1995年 | 224篇 |
1994年 | 178篇 |
1993年 | 163篇 |
1992年 | 153篇 |
1991年 | 126篇 |
1990年 | 138篇 |
1989年 | 81篇 |
1988年 | 85篇 |
1987年 | 72篇 |
1986年 | 57篇 |
1985年 | 99篇 |
1984年 | 58篇 |
1983年 | 46篇 |
1982年 | 44篇 |
1981年 | 53篇 |
1980年 | 38篇 |
1979年 | 37篇 |
1978年 | 23篇 |
1976年 | 27篇 |
1975年 | 24篇 |
1974年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
《Anais brasileiros de dermatologia》2019,94(1):42-46
BackgroundSkin cancer is a highly prevalent condition with a multifactorial etiology resulting from genetic alterations, environmental and lifestyle factors. In Brazil, among all malignant tumors, skin cancers have the highest incidences.ObjectiveTo retrospectively evaluate the incidence, prevalence and profile of basal cell carcinoma, squamous cell carcinoma and cutaneous melanoma in Campos dos Goytacazes and region.Methods:In total, 2,207 histopathological reports of a local reference hospital were analyzed between January 2013 and December 2015, of which 306 corresponded to the neoplasms studied.Results:Of the 306 reports evaluated, 232 basal cell carcinomas (75.9%), 55 squamous cell carcinomas (18%) and 19 cutaneous melanomas (6.5%) were identified. The face was the most involved anatomical site (58.8%) and women (51%) were the most affected gender. The temporal analysis revealed a decrease in the overall incidence of 3.4% from 2013 to 2014 and 5.4% from 2014 to 2015. There was a 10.1% increase in basal cell carcinomas and 38% in melanomas in this period; however, there was a decrease in the number of squamous cell carcinomas of 14.8% during the studied years.Study limitations:Some samples of cutaneous fragments had no identification of the anatomical site of origin.Conclusion:Research that generates statistical data on cutaneous tumors produces epidemiological tools useful in the identification of risk groups and allows the adoption of more targeted and efficient future prevention measures. 相似文献
22.
23.
目的 探讨台州市功能性消化不良的流行病学现状及影响因素。方法 回顾性选取2020年1月至2022年2月浙江省台州医院收治的功能性消化不良患者200例,统计患者的一般资料,分析该病的流行病学现状,对功能性消化不良的影响因素进行单因素分析,然后将差异有统计学意义的因素再进一步纳入多因素Logistic回归分析。结果 200例功能性消化不良患者中,女性发病率高于男性;30~60岁年龄段群体,患病率最高;存在暴饮暴食、喜食烫食、挑食、多食酸制品、未准时进食、常食宵夜、睡眠时间<6h、有药物过敏史、有功能性消化不良家族史、存在便秘情况者的患病率均高于未存在以上情况者,差异均有统计学意义(P<0.05)。多因素Logistic回归分析显示,性别、年龄、暴饮暴食、喜食烫食、挑食、多食酸制品、未准时进食、宵夜摄取情况、每天睡眠时间、药物过敏史、家族史、便秘是该病患病率升高的主要影响因素。结论 性别、年龄、暴饮暴食、喜食烫食、挑食、酸制品、未准时进食情况、宵夜摄取情况、每天睡眠时间、药物过敏史、家族史、便秘是功能性消化不良的主要影响因素。 相似文献
24.
目的 探究高龄产妇产后抑郁的影响因素,为护理人员今后在临床工作中提供个性化的护理服务提供参考依据。方法 采用质性研究中的现象学研究法对2021年12月至2022年4月在内蒙古医科大学附属医院妇产科建档分娩的16例高龄产妇进行半结构式访谈,并以Colaizzi现象学研究方法进行资料分析。结果 提炼出影响高龄产妇产后抑郁的4个主题:躯体性压力源;负性心理体验;社会支持缺乏,矛盾出现;角色转变对高龄产妇的影响。结论 需重视高龄产妇产后的主观感受,加强产前产后健康宣教,构建以家庭为中心的高龄产妇产后护理模型,减少产后抑郁的发生。 相似文献
25.
《Clinical neurophysiology》2020,131(1):259-264
ObjectivesFasciculation potentials (FP) are an important consideration in the electrophysiological diagnosis of ALS. Muscle ultrasonography (MUS) has a higher sensitivity in detecting fasciculations than electromyography (EMG), while in some cases, it is unable to detect EMG-detected fasciculations. We aimed to investigate the differences of FP between the muscles with and without MUS-detected fasciculations (MUS-fas).MethodsThirty-one consecutive patients with sporadic ALS were prospectively recruited and in those, both needle EMG and MUS were performed. Analyses of the amplitude, duration, and number of phases of EMG-detected FPs were performed for seven muscles per patient, and results were compared between the muscles with and without MUS-fas in the total cohort.ResultsThe mean amplitude and phase number of FP were significantly lower in patients with EMG-detected FP alone (0.39 ± 0.25 mV and 3.21 ± 0.88, respectively) than in those with both FP and MUS-fas (1.22 ± 0.92 mV and 3.74 ± 1.39, respectively; p < 0.0001 and p = 0.017, Welch’s t-test).ConclusionSmall FP may be undetectable with MUS. MUS cannot replace EMG in the diagnostic approach for ALS.SignificanceClinicians should use a combination of EMG and MUS for the detection and quantitative analysis of fasciculation in ALS. 相似文献
26.
27.
28.
29.
30.
《Ticks and Tick》2020,11(6):101540
Powassan virus (POWV) is a tickborne flavivirus discovered in Ontario, Canada in 1958 that causes long-term neurological sequelae in about half the reported cases and death in a little more than 10 % of cases. The incidence of POWV disease is rising in the United States but there is limited understanding of the scope and causes of recent changes in POWV epidemiology. We focus on quantifying the increase in human POWV disease incidence and infection prevalence in the United States. We also examine differences in the frequency of symptomatic cases and asymptomatic or mildly symptomatic cases, as well as limitations in national and state surveillance for POWV infection. We searched SCOPUS for all articles containing original POWV prevalence research, case studies, or literature reviews published in English. Case studies were supplemented by Morbidity and Mortality Weekly Report POWV data from the Centers for Disease Control and Prevention (CDC) and surveillance information from state health department websites. An increase in the number of POWV cases has been reported in the United States over the past 50 yr, and the geographic range of human POWV cases has expanded. The age distribution of symptomatic POWV cases has shifted, with significantly more individuals over 40 yr old being diagnosed after 1998. The emergence of POWV is due in large part to: (i) a change in transmission of POWV from a vector that rarely bites people (Ixodes cookei) to a new vector that often bites people (Ixodes scapularis) and has expanded its geographic range, (ii) enhanced surveillance efforts for arboviruses, and (iii) a greater awareness of POWV infection. 相似文献