全文获取类型
收费全文 | 5452篇 |
免费 | 553篇 |
国内免费 | 133篇 |
专业分类
耳鼻咽喉 | 42篇 |
儿科学 | 132篇 |
妇产科学 | 247篇 |
基础医学 | 705篇 |
口腔科学 | 67篇 |
临床医学 | 600篇 |
内科学 | 1083篇 |
皮肤病学 | 92篇 |
神经病学 | 431篇 |
特种医学 | 346篇 |
外科学 | 728篇 |
综合类 | 126篇 |
预防医学 | 328篇 |
眼科学 | 102篇 |
药学 | 430篇 |
中国医学 | 27篇 |
肿瘤学 | 652篇 |
出版年
2023年 | 32篇 |
2022年 | 53篇 |
2021年 | 126篇 |
2020年 | 99篇 |
2019年 | 181篇 |
2018年 | 183篇 |
2017年 | 124篇 |
2016年 | 141篇 |
2015年 | 186篇 |
2014年 | 217篇 |
2013年 | 328篇 |
2012年 | 371篇 |
2011年 | 375篇 |
2010年 | 263篇 |
2009年 | 207篇 |
2008年 | 283篇 |
2007年 | 323篇 |
2006年 | 258篇 |
2005年 | 276篇 |
2004年 | 248篇 |
2003年 | 217篇 |
2002年 | 208篇 |
2001年 | 176篇 |
2000年 | 152篇 |
1999年 | 152篇 |
1998年 | 58篇 |
1997年 | 48篇 |
1996年 | 39篇 |
1995年 | 34篇 |
1994年 | 28篇 |
1993年 | 35篇 |
1992年 | 86篇 |
1991年 | 83篇 |
1990年 | 55篇 |
1989年 | 56篇 |
1988年 | 57篇 |
1987年 | 51篇 |
1986年 | 45篇 |
1985年 | 48篇 |
1984年 | 41篇 |
1983年 | 23篇 |
1982年 | 21篇 |
1981年 | 13篇 |
1980年 | 13篇 |
1979年 | 12篇 |
1978年 | 16篇 |
1977年 | 12篇 |
1975年 | 12篇 |
1974年 | 11篇 |
1969年 | 9篇 |
排序方式: 共有6138条查询结果,搜索用时 31 毫秒
101.
Wei‐Hao Lin Hsing‐Chun Shih Sheng‐Yuan Wang Chuen‐Fu Lin Cheng‐Yao Yang Ming‐Tang Chiou Chao‐Nan Lin 《Transboundary and Emerging Diseases》2019,66(3):1138-1141
In March 2018, an abortion storm caused by porcine reproductive and respiratory syndrome virus was confirmed in a farrow‐to‐finish pig herd in Taiwan. Open reading frame 5 and non‐structural protein 2 of the virus confirmed that the virus is closely related to the virulent strains circulating in the United States. 相似文献
102.
Carbon dioxide insufflation during colonoscopy can significantly decrease post‐interventional abdominal discomfort in deeply sedated patients: A prospective,randomized, double‐blinded,controlled trial
下载免费PDF全文
![点击此处可从《Journal of gastroenterology and hepatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
103.
104.
105.
106.
107.
108.
Chia‐Hung Chen Chuen‐Ming Shih Jen‐Wei Chou Yi‐Heng Liu Liang‐Wen Hang Te‐Chun Hsia Wu‐Huei Hsu Chih‐Yen Tu 《Liver international》2011,31(3):417-424
Background: Spontaneous bacterial empyema (SBE) is a complication of cirrhotic patients in which a pre‐existing pleural effusion becomes infected. This retrospective study was designed to investigate the bacteriology and outcome predictors of SBE in cirrhotic patients. Methods: Medical records of cirrhotic patients treated in a tertiary care university hospital from December 2004 to December 2008 were retrospectively reviewed. Results: Of 3390 cirrhotic patients seen during the study period, 81 cases of SBE were diagnosed. The incidence of SBE was 2.4% (81/3390) in cirrhotic patients and 16% (81/508) in patients with cirrhosis with hydrothorax. There were 46 monomicrobial infections found in 46 SBE patients. Aerobic Gram‐negative organisms were the predominant pathogens (n=29, 63%), and Escherichia coli (n=9, 20%) was the most frequently isolated sole pathogen. The mortality rate of SBE was 38% (31/81). Univariate analysis showed that Child–Pugh score, model for end‐stage liver disease (MELD)–Na score, concomitant bacteraemia, concomitant spontaneous bacterial peritonitis, initial intensive care unit (ICU) admission and initial antibiotic treatment failure were predictors of poor outcomes. Multivariate regression analysis demonstrated that the independent factors related to a poor outcome were initial ICU admission [odds ratio (OR): 4.318; 95% confidence interval 1CI) 1.09–17.03; P=0.037], MELD–Na score (OR: 1.267; 95% CI 1.08–1.49; P=0.004) and initial antibiotic treatment failure (OR: 13.10; 95% CI 2.60–66.03). Conclusion: Spontaneous bacterial empyema in cirrhotic patients is a high mortality complication. The independent factors related to poor outcome are high MELD–Na score, initial ICU admission and initial antibiotic treatment failure. High MELD–Na score may be a useful mortality predictor of SBE in cirrhotic patients. 相似文献
109.
Ming-Cheng Shih Shih-Heng Tseng Yu-Shih Weng I-Ming Chu Cheng-Hsien Liu 《Biomedical microdevices》2013,15(5):767-780
The acinus-mimicking microfluidic chip, which simulates the in vivo condition of the liver, was developed and reported in this paper. The gradient microenvironment of the liver acinus is replicated within this proposed microfluidic chip. The advantage of this acinus-mimicking chip is capable of adjusting the concentration gradient in a relatively short period of time at around 10 s. At the same instance the non-linear concentration gradient can be presented in the various zones within this microfluidic chip. The other advantage of this proposed design is in the convenience of allowing the direct injection of the cells into the chip. The environment within the chip is multi-welled and gel-free with high cell density. The multi-row pillar microstructure located at the entrance of the top and bottom flow channels is designed to be able to balance the pressure of the perfusion medium. Through this mechanism the shear stress experienced by the cultured cells can be minimized to reduce the potential damage flow from the perfusion process. (3)The fluorescence staining and the observations of the cell morphology verify the life and death of the cells. The shear stress experienced by the cells in the various zones within the chip can be effectively mapped. The serum glutamic oxaloacetic transaminase (SGOT) collected from the supernatants was used to determine the effects of the degassing process and the shear stress of the medium flow on the cultured cells. 相似文献
110.
Melatonin suppresses TPA‐induced metastasis by downregulating matrix metalloproteinase‐9 expression through JNK/SP‐1 signaling in nasopharyngeal carcinoma
下载免费PDF全文
![点击此处可从《Journal of pineal research》网站下载免费的PDF全文](/ch/ext_images/free.gif)