全文获取类型
收费全文 | 14501篇 |
免费 | 956篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 76篇 |
儿科学 | 415篇 |
妇产科学 | 396篇 |
基础医学 | 1714篇 |
口腔科学 | 178篇 |
临床医学 | 2247篇 |
内科学 | 3001篇 |
皮肤病学 | 178篇 |
神经病学 | 1411篇 |
特种医学 | 241篇 |
外科学 | 1298篇 |
综合类 | 388篇 |
一般理论 | 18篇 |
预防医学 | 2031篇 |
眼科学 | 262篇 |
药学 | 635篇 |
中国医学 | 15篇 |
肿瘤学 | 1003篇 |
出版年
2023年 | 78篇 |
2022年 | 90篇 |
2021年 | 261篇 |
2020年 | 152篇 |
2019年 | 239篇 |
2018年 | 284篇 |
2017年 | 217篇 |
2016年 | 230篇 |
2015年 | 289篇 |
2014年 | 430篇 |
2013年 | 694篇 |
2012年 | 976篇 |
2011年 | 1123篇 |
2010年 | 593篇 |
2009年 | 522篇 |
2008年 | 999篇 |
2007年 | 1051篇 |
2006年 | 1002篇 |
2005年 | 1000篇 |
2004年 | 976篇 |
2003年 | 887篇 |
2002年 | 837篇 |
2001年 | 118篇 |
2000年 | 104篇 |
1999年 | 140篇 |
1998年 | 209篇 |
1997年 | 150篇 |
1996年 | 131篇 |
1995年 | 122篇 |
1994年 | 106篇 |
1993年 | 96篇 |
1992年 | 73篇 |
1991年 | 63篇 |
1990年 | 65篇 |
1989年 | 71篇 |
1988年 | 59篇 |
1987年 | 47篇 |
1986年 | 53篇 |
1985年 | 53篇 |
1984年 | 66篇 |
1983年 | 81篇 |
1982年 | 73篇 |
1981年 | 77篇 |
1980年 | 63篇 |
1979年 | 48篇 |
1978年 | 52篇 |
1977年 | 43篇 |
1976年 | 37篇 |
1975年 | 31篇 |
1974年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Remodeling Adult Nursing 总被引:1,自引:0,他引:1
This article describes a nursing education experience in which a critical thinking approach was planned and implemented. Background discussion on critical thinking concepts and related research provides a foundation for presentation of the Mackie teaching model. The model uses a community-based, family-centered scenario as the basis for developing problemfocused nursing intervention skills from a holistic viewpoint. Role expectations of students and faculty are outlined, and related implementation difficulties, together with their resolution strategies, are described. Evaluation methods and outcomes are reviewed in the conclusion. 相似文献
72.
73.
74.
75.
76.
77.
78.
Joan L. Longbottom Ph.D. 《The Journal of allergy and clinical immunology》1983,72(6):668-675
Sera of patients with ABPA were tested by XRIE tests incorporating their own serum (self-XRIE) to detect the presence of IgG/IgE antigen complexes to a “reference” Aspergillus fumigatus preparation. Of the 32 sera studied, 29 (90%) had visible precipitin (IgG) peaks, and 27 of these 29 as well as the three apparently precipitin-negative sera, i.e., 30 (94%), showed binding of specific IgE by autoradiography. The two precipitin-positive sera that did not show IgE binding were also skin test negative and RAST negative to this A. fumigatus antigen. Specific IgG as determined in ELISA correlated well with the grading of the XIE precipitin peaks (p < 0.05). There was also a highly significant correlation between specific IgE by RAST and grading the radioactive uptake seen in the autoradiograph (p < 0.001) indicating, for each serum, the presence of IgG antibodies to most of the components to which there was specific IgE. In the self-XRIE tests there was considerable variation of reactivity from serum to serum, in numbers of antigen/antibody peaks observed, in relative peak heights, and in the intensity of the respective staining. By comparing each test to a “reference” pattern developed with the use of an ABPA serum pool, the antigenic components of A. fumigatus were found to be of two main types: (1) antigens that appeared to be poorly precipitating (possibly low-molecular-weight components) but showed strong IgE binding (these were apparently major allergenic components and with one exception proved to be the faster migrating components) and (2) antigens that produced the strongest precipitin reactions with only weak binding of specific IgE and therefore minor allergenic components. 相似文献
79.
80.
Ischemic preconditioning increases the tolerance of Fatty liver to hepatic ischemia-reperfusion injury in the rat 总被引:16,自引:0,他引:16
下载免费PDF全文
![点击此处可从《The American journal of pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Serafín A Roselló-Catafau J Prats N Xaus C Gelpí E Peralta C 《The American journal of pathology》2002,161(2):587-601
Hepatic steatosis is a major risk factor in ischemia-reperfusion. The present study evaluates whether preconditioning, demonstrated to be effective in normal livers, could also confer protection in the presence of steatosis and investigates the potential underlying protective mechanisms. Fatty rats had increased hepatic injury and decreased survival after 60 minutes of ischemia compared with lean rats. Fatty livers showed a degree of neutrophil accumulation and microcirculatory alterations similar to that of normal livers. However, in presence of steatosis, an increased lipid peroxidation that could be reduced with glutathione-ester pretreatment was observed after hepatic reperfusion. Ischemic preconditioning reduced hepatic injury and increased animal survival. Both in normal and fatty livers, this endogenous protective mechanism was found to control lipid peroxidation, hepatic microcirculation failure, and neutrophil accumulation, reducing the subsequent hepatic injury. These beneficial effects could be mediated by nitric oxide, because the inhibition of nitric oxide synthesis and nitric oxide donor pretreatment abolished and simulated, respectively, the benefits of preconditioning. Thus, ischemic preconditioning could be an effective surgical strategy to reduce the hepatic ischemia-reperfusion injury in normal and fatty livers under normothermic conditions, including hepatic resections, and liver transplantation. 相似文献