全文获取类型
收费全文 | 3661篇 |
免费 | 176篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 51篇 |
儿科学 | 37篇 |
妇产科学 | 40篇 |
基础医学 | 410篇 |
口腔科学 | 91篇 |
临床医学 | 343篇 |
内科学 | 738篇 |
皮肤病学 | 60篇 |
神经病学 | 506篇 |
特种医学 | 115篇 |
外科学 | 697篇 |
综合类 | 34篇 |
预防医学 | 188篇 |
眼科学 | 38篇 |
药学 | 300篇 |
中国医学 | 9篇 |
肿瘤学 | 203篇 |
出版年
2023年 | 27篇 |
2022年 | 58篇 |
2021年 | 66篇 |
2020年 | 56篇 |
2019年 | 65篇 |
2018年 | 67篇 |
2017年 | 64篇 |
2016年 | 63篇 |
2015年 | 82篇 |
2014年 | 104篇 |
2013年 | 132篇 |
2012年 | 196篇 |
2011年 | 205篇 |
2010年 | 116篇 |
2009年 | 92篇 |
2008年 | 162篇 |
2007年 | 141篇 |
2006年 | 147篇 |
2005年 | 153篇 |
2004年 | 154篇 |
2003年 | 153篇 |
2002年 | 123篇 |
2001年 | 156篇 |
2000年 | 127篇 |
1999年 | 133篇 |
1998年 | 40篇 |
1997年 | 46篇 |
1996年 | 24篇 |
1995年 | 24篇 |
1994年 | 19篇 |
1993年 | 20篇 |
1992年 | 61篇 |
1991年 | 48篇 |
1990年 | 50篇 |
1989年 | 57篇 |
1988年 | 43篇 |
1987年 | 41篇 |
1986年 | 46篇 |
1985年 | 40篇 |
1984年 | 27篇 |
1983年 | 21篇 |
1979年 | 19篇 |
1978年 | 21篇 |
1977年 | 21篇 |
1976年 | 31篇 |
1975年 | 36篇 |
1974年 | 28篇 |
1973年 | 35篇 |
1972年 | 18篇 |
1971年 | 22篇 |
排序方式: 共有3860条查询结果,搜索用时 15 毫秒
991.
992.
993.
Daniela A. Herzig Julia Tracy Marcus Munafò Christine Mohr 《Journal of behavior therapy and experimental psychiatry》2010,41(4):397-408
Tobacco use is positively associated with severity of symptoms along the schizophrenia spectrum. Accordingly it could be argued that neuropsychological performance, formerly thought to be modulated by schizotypy, is actually modulated by drug use or an interaction of drug use and schizotypy. We tested whether habitual cigarette smokers as compared to non-smokers would show a neuropsychological profile similar to that observed along the schizophrenia spectrum and, if so, whether smoking status or nicotine dependence would be more significant modulators of behavior than schizotypy. Because hemispheric dominance has been found to be attenuated along the schizophrenia spectrum, 40 right-handed male students (20 non-smokers) performed lateralized left- (lexical decisions) and right- (facial decision task) hemisphere dominant tasks. All individuals completed self-report measures of schizotypy and nicotine dependence. Schizotypy predicted laterality in addition to smoking status: While positive schizotypy (Unusual Experiences) was unrelated to hemispheric performance, Cognitive Disorganization predicted reduced left hemisphere dominant language functions. These latter findings suggest that Cognitive Disorganization should be regarded separately as a potentially important mediator of thought disorganization and language processing. Additionally, increasing nicotine dependence among smokers predicted a right hemisphere shift of function in both tasks that supports the role of the right hemisphere in compulsive/impulsive behavior. 相似文献
994.
995.
Werdan K Pilz G Müller-Werdan U Maas Enriquez M Schmitt DV Mohr FW Neeser G Schöndube F Schäfers HJ Haverich A Fraunberger P Andersson J Kreuzer E Thijs LG;Early Supplemental Severe SIRS Treatment With IVIG in Score-Identified High-Risk Patients After Cardiac Surgery 《Critical care medicine》2008,36(3):716-723
996.
Inconsistent findings regarding the valence hypothesis might relate to ambiguously valenced stimuli used in some studies. To account for this potential caveat, we used positive and negative attachment words. A total of 50 participants made lexical decisions in a bilateral simultaneous presentation paradigm. Results showed a general right-visual-field advantage for lexical decisions and a general superiority for positive over negative words. Crucially, we found a left-visual-field advantage for positive over negative words. Results oppose the valence hypothesis, but support a specific role of the right hemisphere in emotional processing, in particular when dealing with positive interpersonal relationship information. 相似文献
997.
998.
Thomas H Müller Harald Mohr Thomas Montag 《Clinical chemistry and laboratory medicine》2008,46(7):933-946
Culture-based and molecular assays have been developed for the screening of platelet concentrates and other blood components for bacterial contaminations. In this review, the principles of the assays are outlined. The focus of this review is the assessment of the analytical qualities of the methods. Spiking studies by adding defined levels of a wide range of bacteria to the complex biological matrix provide the first basis to evaluate and compare the qualities of methods for bacterial detection. The sensitivity acceptable for reliable screening for bacteria critically depends on the timing of either early sampling (within a period of up to 24 h after preparation of the blood component) or late sampling (a few hours before issuing the blood component). Large screening studies are essential to confirm both adequate sensitivity and specificity of the testing. In the ideal setting, these studies are prospectively planned and include systematic surveillance of adverse events in response to the administration of the screened products. The findings from sterility testing (predominantly with automated systems for detection of bacteria based on CO(2) generation) of more than 550,000 platelet concentrates in 13 studies are summarised. The limitations of the early sampling and the "negative-to-date" strategy to issue platelet concentrates are addressed. A few reported cases of probable transmission of bacteria by platelet transfusion despite negative screening tests emphasise the need to further develop optimised methods for testing of bacteria blood components. 相似文献
999.
1000.