全文获取类型
收费全文 | 162564篇 |
免费 | 10863篇 |
国内免费 | 1275篇 |
专业分类
耳鼻咽喉 | 2264篇 |
儿科学 | 3033篇 |
妇产科学 | 3788篇 |
基础医学 | 24201篇 |
口腔科学 | 3380篇 |
临床医学 | 15387篇 |
内科学 | 30990篇 |
皮肤病学 | 4360篇 |
神经病学 | 12143篇 |
特种医学 | 8132篇 |
外科学 | 22081篇 |
综合类 | 2389篇 |
现状与发展 | 5篇 |
一般理论 | 81篇 |
预防医学 | 9888篇 |
眼科学 | 4328篇 |
药学 | 13848篇 |
中国医学 | 1668篇 |
肿瘤学 | 12736篇 |
出版年
2023年 | 997篇 |
2022年 | 2771篇 |
2021年 | 4855篇 |
2020年 | 2494篇 |
2019年 | 3624篇 |
2018年 | 4460篇 |
2017年 | 3274篇 |
2016年 | 4224篇 |
2015年 | 5681篇 |
2014年 | 6959篇 |
2013年 | 8436篇 |
2012年 | 12722篇 |
2011年 | 12354篇 |
2010年 | 7296篇 |
2009年 | 6115篇 |
2008年 | 9317篇 |
2007年 | 9196篇 |
2006年 | 8445篇 |
2005年 | 8045篇 |
2004年 | 7206篇 |
2003年 | 6326篇 |
2002年 | 5470篇 |
2001年 | 4473篇 |
2000年 | 4087篇 |
1999年 | 3292篇 |
1998年 | 1323篇 |
1997年 | 1004篇 |
1996年 | 967篇 |
1995年 | 874篇 |
1994年 | 767篇 |
1993年 | 653篇 |
1992年 | 1583篇 |
1991年 | 1588篇 |
1990年 | 1365篇 |
1989年 | 1245篇 |
1988年 | 1161篇 |
1987年 | 1044篇 |
1986年 | 1023篇 |
1985年 | 889篇 |
1984年 | 649篇 |
1983年 | 568篇 |
1982年 | 401篇 |
1981年 | 381篇 |
1980年 | 339篇 |
1979年 | 524篇 |
1978年 | 411篇 |
1977年 | 391篇 |
1976年 | 347篇 |
1974年 | 367篇 |
1973年 | 333篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Three‐Dimensional Echocardiographic Evaluation of Mitral Apparatus during Preload Manipulation in Patients with Hypertrophic Cardiomyopathy
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hyemoon Chung M.D. Ji Hyun Yoon M.D. Young Won Yoon M.D. Ph.D. Ji Young Chung B.N. Jung‐Joon Cha M.D. Jong‐Youn Kim M.D. Ph.D. Pil‐Ki Min M.D. Ph.D. Byoung‐Kwon Lee M.D. Ph.D. Bum‐Kee Hong M.D. Ph.D. Se‐Joong Rim M.D. Ph.D. Hyuck Moon Kwon M.D. Eui‐Young Choi M.D. Ph.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(8):1261-1269
92.
93.
ABSTRACT Tryptophan (Trp) is not only a nutrient enhancer but also has systemic effects. Trp metabolites signaling through the well-known aryl hydrocarbon receptor (AhR) constitute the interface of microbiome-gut-brain axis. However, the pathway through which Trp metabolites affect central nervous system (CNS) function have not been fully elucidated. AhR participates in a broad variety of physiological and pathological processes that also highly relevant to intestinal homeostasis and CNS diseases. Via the AhR-dependent mechanism, Trp metabolites connect bidirectional signaling between the gut microbiome and the brain, mediated via immune, metabolic, and neural (vagal) signaling mechanisms, with downstream effects on behavior and CNS function. These findings shed light on the complex Trp regulation of microbiome-gut-brain axis and add another facet to our understanding that dietary Trp is expected to be a promising noninvasive approach for alleviating systemic diseases. 相似文献
94.
95.
96.
97.
Thomas S. Klitzner Maggie Lee Sandra Rodriguez Ruey‐Kang R. Chang 《Congenital heart disease》2006,1(3):77-88
Background. It has been reported that gender differences in cardiovascular outcomes found in adults also are present in children who undergo surgical repair for congenital heart disease. Methods. California statewide hospital discharge data 1989–99 were used to study outcomes in children <18 years undergoing cardiac surgery. Hospital discharge data were linked to death registry data to study postdischarge death within 30 days of discharge. We used logistic regression to evaluate the effect of gender on mortality controlling for age, race and ethnicity, type of insurance, household income, date and month of surgery, type of admission, hospital case volume, and various types of procedures. Results. There were 25 402 cardiac surgery cases with 1505 in‐hospital deaths (mortality rate of 5.92%). An additional 37 deaths occurred within 30 days after hospital discharge. Crude mortality rates for males (5.99%) and females (5.84%) were not significantly different. However, fewer neonates were female and females underwent a higher proportion of low‐risk procedures than males. Logistic regression revealed that females, compared with males, had a significantly higher odds ratio (OR) for in‐hospital mortality (OR = 1.18, P < .01) and overall (up to 30 days post discharge) mortality (OR = 1.18, P < .01). The risk‐adjusted length of hospital stay was similar between females and males while charges per hospital day were slightly higher in females than males. The prevalence of Down syndrome, pulmonary hypertension, and failure to thrive were higher in females. Conclusions. Female gender is associated with an 18% higher in‐hospital and 30‐day postdischarge mortality as compared with male gender. There was no difference in length of hospital stay between males and females. The mechanism by which female gender acts as a risk factor requires further investigation. 相似文献
98.
Nikki Lee 《Journal of human lactation》2006,22(1):11; author reply 11-11; author reply 12
99.
100.
Neil H Pliskin Alia N Ammar Joseph W Fink S Kristian Hill Aaron C Malina Alona Ramati Kathleen M Kelley Raphael C Lee 《Journal of the International Neuropsychological Society》2006,12(1):17-23
The clinical presentation of electrical injury commonly involves physical, cognitive, and emotional complaints. Neuropsychological studies, including case reports, have indicated that electrical injury (EI) survivors may experience a broad range of impaired neuropsychological functions, although this has not been clarified through controlled investigation. In this study, we describe the neuropsychological test findings in a series of 29 EI patients carefully screened and matched to a group of 29 demographically similar healthy electricians. Participants were matched by their estimated premorbid intellectual ability. Multivariate analysis of variance was used to assess group differences in the following neuropsychological domains: attention and mental speed, working memory, verbal memory, visual memory, and motor skills. EI patients performed significantly worse on composite measures of attention/mental speed and motor skills, which could not be explained by demographic differences, injury parameters, litigation status, or mood disturbance. Results suggest that cognitive changes do occur in patients suffering from electrical injury. 相似文献