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   4818篇
  免费   188篇
  国内免费   12篇
耳鼻咽喉   39篇
儿科学   168篇
妇产科学   66篇
基础医学   546篇
口腔科学   289篇
临床医学   595篇
内科学   715篇
皮肤病学   25篇
神经病学   501篇
特种医学   117篇
外科学   662篇
综合类   26篇
一般理论   1篇
预防医学   420篇
眼科学   15篇
药学   371篇
肿瘤学   462篇
  2021年   28篇
  2020年   37篇
  2019年   42篇
  2018年   65篇
  2017年   47篇
  2016年   54篇
  2015年   61篇
  2014年   97篇
  2013年   174篇
  2012年   253篇
  2011年   228篇
  2010年   153篇
  2009年   130篇
  2008年   298篇
  2007年   306篇
  2006年   298篇
  2005年   326篇
  2004年   287篇
  2003年   288篇
  2002年   272篇
  2001年   83篇
  2000年   63篇
  1999年   64篇
  1998年   71篇
  1997年   79篇
  1996年   66篇
  1995年   53篇
  1994年   47篇
  1993年   40篇
  1992年   62篇
  1991年   52篇
  1990年   46篇
  1989年   36篇
  1988年   42篇
  1987年   41篇
  1986年   48篇
  1985年   47篇
  1984年   46篇
  1983年   53篇
  1982年   52篇
  1981年   43篇
  1980年   38篇
  1979年   35篇
  1978年   33篇
  1977年   37篇
  1976年   23篇
  1975年   31篇
  1974年   27篇
  1968年   23篇
  1967年   25篇
排序方式: 共有5018条查询结果,搜索用时 15 毫秒
101.
The effect of alcohol intake on varicose veins (VV) has not been determined by its consumption level. The aim of this study was to investigate the association between alcohol intake and VV in an elderly general population. Using a cross‐sectional approach, the Shimane CoHRE Study data, comprising a total of 1060 participants, were analyzed. By multivariate regression analysis adjusted with basic characteristics, past work history, lifestyle‐related factors and medical history, compared with non‐drinkers, mild drinkers (<20.0 g/day) showed a significantly lower adjusted odds ratio (aOR) of VV (aOR = 0.64, P = 0.036). In a similar way, regular drinkers (1–5 days/week) showed a significantly lower aOR of VV when compared with occasional drinkers (aOR = 0.57, P = 0.032). VV and alcohol intake showed J‐curve relationships. In a stratified analysis by alcohol consumption levels, the association of smoking and VV were also observed in moderate to heavy drinkers and habitual drinkers. These findings can provide better understanding of pathophysiological mechanism and be used for evidence‐based patient education.  相似文献   
102.
103.
104.
Understanding of the traditional Wenckebach phenomenon is enhanced by using a modified ladder diagram where AV conduction in any cycle is represented by a slanted line in the AV bar together with similar AV conduction lines of all the preceding cycles. The diagram facilitates calculation of the duration of RR intervals (equal to the basic PP or sinus interval minus the PR or AV increment applied to this particular cycle) and the duration of the pause (equal to 2 × PP or sinus interval minus the sum of all the increments applied to the AV delay). The modified Wenckebach diagram should help students understand the mysterious clustering of QRS complexes or “paradoxical” increase of the ventricular rate that occurs during a Wenckebach sequence. Ann Noninvasive Electrocardiol 2012;17(1):3–7  相似文献   
105.
The human host defense peptide, LL‐37, is an important player in the first line of defense against invading microorganisms. LL‐37 and its precursor, hCAP18, have been detected in unstimulated whole saliva but no reports showing hCAP18/LL‐37 in isolated, parotid, and/or submandibular/sublingual saliva have been presented. Here, we measured the levels of hCAP18/LL‐37 in human parotid and submandibular/sublingual saliva and investigated the expression of hCAP18/LL‐37 in parotid and submandibular gland tissue. Parotid and submandibular/sublingual saliva was collected from healthy volunteers, and the levels of hCAP18/LL‐37 in saliva were analyzed by dot blot, ELISA, and western blotting. Cellular expression of hCAP18/LL‐37 in human parotid and submandibular glands was investigated by immunohistochemistry. Immunoreactivity for hCAP18/LL‐37 was detected in both parotid and submandibular/sublingual saliva of all individuals. The concentration of hCAP18/LL‐37 was similar in parotid and submandibular/sublingual saliva, and was determined by densitometric scanning of each dot and normalization to the total protein concentration of each sample, and by ELISA. Double immunohistochemistry revealed that intravascular neutrophils of both parotid and submandibular glands express hCAP18/LL‐37. For the first time, we demonstrate hCAP18/LL‐37 in isolated human parotid and submandibular/sublingual saliva and expression of hCAP18/LL‐37 in glandular intravascular neutrophils, indicating that neutrophils of the major salivary glands contribute to the LL‐37 content of whole saliva.  相似文献   
106.
Cutaneous fistula as a clinical presentation of intracardiac abscess of the right side is such an unusual occurrence that it has not until now been reported in the English-language medical literature. We present a rare case of right-sided infective endocarditis caused by Achromobacter xylosoxidans in which recurrent infection presented as sternal wound discharge. The infection was found to have an intracardiac origin and was successfully managed by radical débridement on cardiopulmonary bypass.  相似文献   
107.
108.
Scand J Caring Sci; 2011; 25; 3–11
Patients’ experiences of physical limitations in daily life activities when suffering from chronic heart failure; a phenomenographic analysis The aim of the study was to describe how patients suffering from chronic heart failure conceived their physical limitations in daily life activities. An explorative and qualitative design with a phenomenographic approach was chosen, a total of 15 patients were interviewed. The findings indicate that participants perceived a variety of structural aspects pertaining to physical limitations in activities of daily life which resulted in four referential aspects. Need of finding practical solutions in daily life focused on how life had to be changed and other ways of performing activities of daily life had to be invented. Having realistic expectations about the future was characterised by belief that the future itself would be marked by change in physical functioning, but an incentive to maintain functions and activities ensured good quality of or even increased capacity in daily life. Not believing in one’s own ability included the perception of having no opportunity to improve ability to perform activities of daily life. There were perceptions of undesired passivity, undefined fear of straining themselves or performing activities that could endanger their health in addition to uncertainty about the future. In Losing one’s social role in daily life, participants described losing their social network and their position in society and family because of limited physical capacity. A lack of important issues, mental and physical, occurred when physical capacity was lost. In conclusion, patients suffering from chronic heart failure found new solutions to manage activities in daily life, including willingness to change focus and identify other ways of doing important things. Patients had an incentive to maintain functions and activities to ensure a good quality of and strengthen their physical capacity in daily life. Inability to trust in their physical capacity in combination with experienced limitations in daily life prevented patients from attempting to increase activities.  相似文献   
109.
110.
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