全文获取类型
收费全文 | 170023篇 |
免费 | 47027篇 |
国内免费 | 4769篇 |
专业分类
耳鼻咽喉 | 2668篇 |
儿科学 | 5368篇 |
妇产科学 | 1666篇 |
基础医学 | 27228篇 |
口腔科学 | 6752篇 |
临床医学 | 22142篇 |
内科学 | 36705篇 |
皮肤病学 | 9008篇 |
神经病学 | 17982篇 |
特种医学 | 6927篇 |
外国民族医学 | 23篇 |
外科学 | 23388篇 |
综合类 | 12343篇 |
现状与发展 | 28篇 |
一般理论 | 28篇 |
预防医学 | 10498篇 |
眼科学 | 4100篇 |
药学 | 15349篇 |
68篇 | |
中国医学 | 5044篇 |
肿瘤学 | 14504篇 |
出版年
2024年 | 197篇 |
2023年 | 1135篇 |
2022年 | 2915篇 |
2021年 | 5290篇 |
2020年 | 7570篇 |
2019年 | 13023篇 |
2018年 | 12639篇 |
2017年 | 13676篇 |
2016年 | 14634篇 |
2015年 | 15836篇 |
2014年 | 16712篇 |
2013年 | 17341篇 |
2012年 | 12090篇 |
2011年 | 12287篇 |
2010年 | 13920篇 |
2009年 | 9701篇 |
2008年 | 7923篇 |
2007年 | 6368篇 |
2006年 | 6172篇 |
2005年 | 5297篇 |
2004年 | 4313篇 |
2003年 | 4213篇 |
2002年 | 3739篇 |
2001年 | 2932篇 |
2000年 | 2529篇 |
1999年 | 1858篇 |
1998年 | 964篇 |
1997年 | 808篇 |
1996年 | 689篇 |
1995年 | 634篇 |
1994年 | 592篇 |
1993年 | 413篇 |
1992年 | 525篇 |
1991年 | 476篇 |
1990年 | 398篇 |
1989年 | 378篇 |
1988年 | 274篇 |
1987年 | 272篇 |
1986年 | 218篇 |
1985年 | 171篇 |
1984年 | 100篇 |
1983年 | 88篇 |
1982年 | 74篇 |
1981年 | 50篇 |
1980年 | 52篇 |
1979年 | 46篇 |
1978年 | 34篇 |
1975年 | 29篇 |
1974年 | 30篇 |
1973年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
94.
95.
96.
97.
Previous epidemiologic studies have assessed the role of the exposure to ambient air pollution in the development of cardiac birth defects, but they have provided somewhat inconsistent results. To assess the associations between exposure to ambient air pollutants and the risk of cardiac defects, a population-based case-control study was conducted using 1087 cases of cardiac defects and a random sample of 10,870 controls from 1,533,748 Taiwanese newborns in 2001 to 2007.Logistic regression was performed to calculate odds ratios for 10 ppb increases in O3 and 10 μg/m3 increases in PM10. In addition, we compared the risk of cardiac defects in 4 categories-high exposure (>75th percentile); medium exposure (75th to 50th percentile); low exposure (<50th–25th percentile); reference (<25th percentile) based on the distribution of each pollutant. The risks of ventricular septal defects (VSD), atrial septal defects (ASD), and patent ductus arteriosus (PDA) were associated with 10 ppb increases in O3 exposure during the first 3 gestational months among term and preterm babies. In comparison between high PM10 exposure and reference category, there were statistically significant elevations in the effect estimates of ASD for all and terms births. In addition, there was a negative or weak association between SO2, NO2, CO, and cardiac defects.The study proved that exposure to outdoor air O3 and PM10 during the first trimester of gestation may increase the risk of VSD, ASD, and PDA. 相似文献
98.
Fardin Moradi Vahid Maleki Sevda Saleh‐Ghadimi Fatemeh Kooshki Bahram Pourghassem Gargari 《Clinical and experimental pharmacology & physiology》2019,46(11):975-983
Diabetes, as a low‐grade chronic inflammatory disease, causes disruption in proper function of immune and metabolic system. Chromium is an important element required for normal lipid and glucose metabolism. Chromium deficiency is correlated with elevation in cardiometabolic risk, which results from increased inflammation. This systematic review was conducted to discover the potential roles of chromium on inflammatory biomarkers. Eligible studies were all in vitro, animal and human studies published in English‐language journals from inception until October 2018. PubMed, Scopus, Embase, ProQuest and Google Scholar databases were searched to fined interventional studies from the effects of chromium on inflammatory biomarkers such as tumour necrosis factor a (TNF‐a), C‐reactive protein (CRP), interleukins, monocyte chemoattractant protein–1 (MCP‐1), intercellular adhesion molecule‐1 (ICAM‐1) and adipocytokines in hyperglycaemia and diabetes. Out of 647 articles found in the search, only 14 articles were eligible for analysis, three in vitro studies, eight animal studies and three human studies. Twelve of the 14 studies included in this review, chromium significantly decreased inflammatory factors. The findings of this review indicate, based on in vitro and in vivo studies, that chromium might have potential anti‐inflammatory properties, but some of the studies did not show anti‐inflammatory effects for chromium (two studies). There are only three studies in humans with controversial results. Therefore, more consistent randomized double‐blind controlled trials are needed to reach relevant clinical recommendations, as well as to determine the precise mechanism, of chromium on inflammation in diabetes. 相似文献
99.
100.
Three‐Dimensional Echocardiographic Evaluation of Mitral Apparatus during Preload Manipulation in Patients with Hypertrophic Cardiomyopathy 下载免费PDF全文
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