全文获取类型
收费全文 | 213840篇 |
免费 | 14924篇 |
国内免费 | 2804篇 |
专业分类
耳鼻咽喉 | 2900篇 |
儿科学 | 4073篇 |
妇产科学 | 5609篇 |
基础医学 | 30461篇 |
口腔科学 | 4297篇 |
临床医学 | 21179篇 |
内科学 | 40187篇 |
皮肤病学 | 5099篇 |
神经病学 | 15276篇 |
特种医学 | 10133篇 |
外国民族医学 | 6篇 |
外科学 | 28893篇 |
综合类 | 6250篇 |
现状与发展 | 12篇 |
一般理论 | 89篇 |
预防医学 | 12926篇 |
眼科学 | 5576篇 |
药学 | 18117篇 |
20篇 | |
中国医学 | 3117篇 |
肿瘤学 | 17348篇 |
出版年
2023年 | 1458篇 |
2022年 | 3861篇 |
2021年 | 6602篇 |
2020年 | 3610篇 |
2019年 | 4937篇 |
2018年 | 6055篇 |
2017年 | 4504篇 |
2016年 | 5394篇 |
2015年 | 7483篇 |
2014年 | 9222篇 |
2013年 | 11095篇 |
2012年 | 16459篇 |
2011年 | 16058篇 |
2010年 | 9594篇 |
2009年 | 8180篇 |
2008年 | 12086篇 |
2007年 | 11974篇 |
2006年 | 11142篇 |
2005年 | 10558篇 |
2004年 | 9460篇 |
2003年 | 8517篇 |
2002年 | 7409篇 |
2001年 | 5978篇 |
2000年 | 5413篇 |
1999年 | 4421篇 |
1998年 | 1817篇 |
1997年 | 1407篇 |
1996年 | 1334篇 |
1995年 | 1217篇 |
1994年 | 1075篇 |
1993年 | 865篇 |
1992年 | 2211篇 |
1991年 | 2092篇 |
1990年 | 1832篇 |
1989年 | 1675篇 |
1988年 | 1545篇 |
1987年 | 1429篇 |
1986年 | 1358篇 |
1985年 | 1164篇 |
1984年 | 872篇 |
1983年 | 749篇 |
1982年 | 512篇 |
1981年 | 496篇 |
1980年 | 436篇 |
1979年 | 723篇 |
1978年 | 563篇 |
1977年 | 489篇 |
1976年 | 453篇 |
1974年 | 456篇 |
1973年 | 412篇 |
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
111.
112.
Ming-Yeh Yang Ching-Yuan Huang Tina H.T. Chiu Kai-Chih Chang Ming-Nan Lin Liang-Yü Chen Anren Hu 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):494-501
Vitamin D is responsible for multiple metabolic functions in humans. Rickets are the most common disease caused by vitamin D deficiency. It is caused by poor calcium intake resulting in poor serum-ionized calcium. The purpose of this study is to develop a rapid, sensitive, and feasible method to determine the 25-hydroxy-vitamin D3 (25(OH)D3) levels in blood samples for clinical assessment. In this study, gas chromatography coupled mass spectrometry with trimethylsilyl derivatization (TMS-GC-MS) is the most suitable protocol for quantitative analyses of 25(OH)D3. Performance of method was evaluated and compared with liquid chromatography and immunoassay. Method validation has been carried out with plasma specimens. The limit of quantitation of TMS-GC-MS method is 1.5 ppb with good linear correlation. Furthermore, the dietary intake and nutritional status of vegetarian and non-vegetarians in Taiwan were assessed by our validated method. As a result, this vitamin D nutrition survey demonstrates that most Taiwanese people have insufficient vitamin D. Due to dietary habits; the male vegans may have the highest risk of vitamin D deficiency. 相似文献
113.
Amy Y. Zhang Christopher Burant Alex Z. Fu Gerald Strauss Donald R. Bodner Lee Ponsky 《Journal of psychosocial oncology》2020,38(2):210-227
AbstractPurpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.Design: Secondary analysis of data collected from a clinical trial.Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI. 相似文献
114.
AbstractCadmium (Cd) as environmental pollutant can induce severe damage, particularly to the testis. This study investigated the effects of Caffeic acid phenethyl ester (CAPE) on testicular dysfunction induced by Cd. Adult mice were intraperitoneally injected with cadmium chloride (CdCl2) with different doses of CAPE pretreatment. After CdCl2 injection, body/testis weight ratio decreased, Cd levels accumulated and zinc levels decreased in testis. Furthermore, Cd intoxication caused a significant increase of oxidative stress levels, antioxidant enzymes activities, and glutathione levels. Interestingly, significant improvements were observed after the administration of CAPE. Our results demonstrated the protective effect of CAPE, linking Cd testicular dysfunction to oxidative stress. 相似文献
115.
116.
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
117.
118.
119.
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
120.