全文获取类型
收费全文 | 1726571篇 |
免费 | 125364篇 |
国内免费 | 3882篇 |
专业分类
耳鼻咽喉 | 22165篇 |
儿科学 | 56385篇 |
妇产科学 | 46618篇 |
基础医学 | 245412篇 |
口腔科学 | 49273篇 |
临床医学 | 154753篇 |
内科学 | 339648篇 |
皮肤病学 | 39090篇 |
神经病学 | 133751篇 |
特种医学 | 65090篇 |
外国民族医学 | 242篇 |
外科学 | 262384篇 |
综合类 | 39265篇 |
现状与发展 | 4篇 |
一般理论 | 566篇 |
预防医学 | 126674篇 |
眼科学 | 40811篇 |
药学 | 125696篇 |
7篇 | |
中国医学 | 4497篇 |
肿瘤学 | 103486篇 |
出版年
2021年 | 13531篇 |
2019年 | 14204篇 |
2018年 | 20758篇 |
2017年 | 15848篇 |
2016年 | 17305篇 |
2015年 | 19701篇 |
2014年 | 27343篇 |
2013年 | 39395篇 |
2012年 | 55112篇 |
2011年 | 57763篇 |
2010年 | 34119篇 |
2009年 | 31779篇 |
2008年 | 53528篇 |
2007年 | 56928篇 |
2006年 | 57286篇 |
2005年 | 54605篇 |
2004年 | 52625篇 |
2003年 | 49933篇 |
2002年 | 48127篇 |
2001年 | 92100篇 |
2000年 | 93850篇 |
1999年 | 77240篇 |
1998年 | 20093篇 |
1997年 | 17537篇 |
1996年 | 17612篇 |
1995年 | 17020篇 |
1994年 | 15478篇 |
1993年 | 14234篇 |
1992年 | 57557篇 |
1991年 | 55415篇 |
1990年 | 53095篇 |
1989年 | 50871篇 |
1988年 | 46255篇 |
1987年 | 45046篇 |
1986年 | 42357篇 |
1985年 | 40093篇 |
1984年 | 29455篇 |
1983年 | 25007篇 |
1982年 | 14003篇 |
1979年 | 25602篇 |
1978年 | 17643篇 |
1977年 | 14947篇 |
1976年 | 13920篇 |
1975年 | 14598篇 |
1974年 | 17676篇 |
1973年 | 16970篇 |
1972年 | 15695篇 |
1971年 | 14475篇 |
1970年 | 13453篇 |
1969年 | 12538篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Anatoly E Martynyuk Ling-Sha Ju Timothy E Morey Jia-Qiang Zhang 《World Journal of Psychiatry》2020,10(5):81-94
The progress of modern medicine would be impossible without the use of general anesthetics (GAs). Despite advancements in refining anesthesia approaches, the effects of GAs are not fully reversible upon GA withdrawal. Neurocognitive deficiencies attributed to GA exposure may persist in neonates or endure for weeks to years in the elderly. Human studies on the mechanisms of the long-term adverse effects of GAs are needed to improve the safety of general anesthesia but they are hampered not only by ethical limitations specific to human research, but also by a lack of specific biological markers that can be used in human studies to safely and objectively study such effects. The latter can primarily be attributed to an insufficient understanding of the full range of the biological effects induced by GAs and the molecular mechanisms mediating such effects even in rodents, which are far more extensively studied than any other species. Our most recent experimental findings in rodents suggest that GAs may adversely affect many more people than is currently anticipated. Specifically, we have shown that anesthesia with the commonly used GA sevoflurane induces in exposed animals not only neuroendocrine abnormalities (somatic effects), but also epigenetic reprogramming of germ cells (germ cell effects). The latter may pass the neurobehavioral effects of parental sevoflurane exposure to the offspring, who may be affected even at levels of anesthesia that are not harmful to the exposed parents. The large number of patients who require general anesthesia, the even larger number of their future unexposed offspring whose health may be affected, and a growing number of neurodevelopmental disorders of unknown etiology underscore the translational importance of investigating the intergenerational effects of GAs. In this mini review, we discuss emerging experimental findings on neuroendocrine, epigenetic, and intergenerational effects of GAs. 相似文献
42.
Assessment of Myocardial Infarct Size by Three‐Dimensional and Two‐Dimensional Speckle Tracking Echocardiography: A Comparative Study to Single Photon Emission Computed Tomography 下载免费PDF全文
43.
44.
45.
46.
Feasibility and Diagnostic Potential of Pulmonary Transit Time Measurement by Contrast Echocardiography: A Pilot Study 下载免费PDF全文
47.
48.
49.
50.