全文获取类型
收费全文 | 10957篇 |
免费 | 652篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 142篇 |
儿科学 | 674篇 |
妇产科学 | 190篇 |
基础医学 | 1169篇 |
口腔科学 | 271篇 |
临床医学 | 779篇 |
内科学 | 2400篇 |
皮肤病学 | 284篇 |
神经病学 | 709篇 |
特种医学 | 378篇 |
外国民族医学 | 1篇 |
外科学 | 1637篇 |
综合类 | 299篇 |
一般理论 | 11篇 |
预防医学 | 585篇 |
眼科学 | 330篇 |
药学 | 1016篇 |
中国医学 | 51篇 |
肿瘤学 | 712篇 |
出版年
2023年 | 77篇 |
2022年 | 163篇 |
2021年 | 343篇 |
2020年 | 207篇 |
2019年 | 249篇 |
2018年 | 339篇 |
2017年 | 259篇 |
2016年 | 289篇 |
2015年 | 295篇 |
2014年 | 422篇 |
2013年 | 555篇 |
2012年 | 754篇 |
2011年 | 793篇 |
2010年 | 523篇 |
2009年 | 384篇 |
2008年 | 632篇 |
2007年 | 619篇 |
2006年 | 527篇 |
2005年 | 519篇 |
2004年 | 494篇 |
2003年 | 382篇 |
2002年 | 350篇 |
2001年 | 222篇 |
2000年 | 229篇 |
1999年 | 194篇 |
1998年 | 118篇 |
1997年 | 69篇 |
1996年 | 69篇 |
1995年 | 67篇 |
1994年 | 55篇 |
1993年 | 35篇 |
1992年 | 99篇 |
1991年 | 106篇 |
1990年 | 87篇 |
1989年 | 106篇 |
1988年 | 84篇 |
1987年 | 72篇 |
1986年 | 62篇 |
1985年 | 68篇 |
1984年 | 64篇 |
1983年 | 65篇 |
1982年 | 38篇 |
1981年 | 31篇 |
1979年 | 49篇 |
1978年 | 33篇 |
1977年 | 32篇 |
1976年 | 32篇 |
1974年 | 40篇 |
1973年 | 39篇 |
1969年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 406 毫秒
11.
12.
13.
Evaluation of polymerase chain reaction and adenosine deaminase assay for the diagnosis of tuberculous effusions in children. 总被引:2,自引:0,他引:2
AIM: To evaluate and compare the utility of polymerase chain reaction (PCR) for the diagnosis of tuberculous effusions in children. METHODS: PCR, adenosine deaminase (ADA) activity and absolute lymphocyte count (ALC) were evaluated in the fluid of 31 tuberculous (20 pleural, 8 ascites and 3 pericardial) and 24 non-tuberculous (10 transudtative ascites, 8 empyema thoracis, 3 malignant pleural and 3 pyopericardium) effusions. RESULTS: Fluid PCR for Mycobacterium tuberculosis was positive in 74% of tuberculous effusions, whereas it was falsely positive in 13% of the non-tuberculous group. The mean fluid ADA and ALC values were significantly higher in tuberculous effusions than in non-tuberculous effusions (p<0.001). The sensitivity and specificity of PCR, ADA (> or =38 IU/l) and ALC (> or =275/mm3) were 74% and 88%, 81% and 75%, and 90% and 83%, respectively, in diagnosing tuberculous effusions. The sensitivity of PCR, ADA and ALC was 100%, 100% and 88%, respectively, for confirmed tuberculous effusions. When the two tests were combined (either/or positive), the sensitivity increased (90-100%) at the expense of specificity. When both the tests were positive, then the specificity markedly increased (92-96%), but sensitivity of the tests decreased. CONCLUSION: Fluid PCR alone should not be relied on as a single test; rather, combined analysis with either ADA or ALC could be more useful in the diagnosis of tuberculous effusions in children. 相似文献
14.
Pankaj Dabir Snehal Dabir B V Siva Prasad M V R Reddy 《Infection, genetics and evolution》2006,6(4):287-291
Molecular characterization of Wuchereria bancrofti is essential to develop suitable anti-filarial drugs and vaccines. We describe here isolation, sequence analysis and cloning of a partial cDNA of an enzyme superoxide dismutase from this parasite. The immunoscreening of a lambda zap W. bancrofti microfilarial (Mf) cDNA library with microfilaremic sera had resulted in the isolation of several seroreactive clones including, WbSOD. This clone contained a 309 bp insert and showed significant nucleotide and deduced amino acid sequence homologies to the superoxide dismutases of other nematode parasites. The antioxidant property of this enzyme may have important contribution in the defense mechanism of the parasite against host immune response. 相似文献
15.
J J Rodrigues N J Shaikh D A Gadkari S R Prasad S George P Yergolkar L V Hungund 《The Southeast Asian journal of tropical medicine and public health》1988,19(2):323-326
Brain tissues from 38 patients with a clinical suspicion of encephalitis or encephalopathy were examined by two immunoenzymatic techniques for the detection of arboviral antigen. Group B arboviral antigen was identified in 23 of these tissues. This simple method could be used for the diagnosis of the causal agent of encephalitis. 相似文献
16.
G B Hopkinson D A Woodward N Prasad B R Bullen 《Annals of the Royal College of Surgeons of England》1983,65(5):323-324
The presence of accessory channels between the liver and extrahepatic bile ducts has long been recognised by anatomists and the division of such ducts may be a cause of bile leakage following cholecystectomy. However, visualisation of accessory bile ducts at operation is difficult as they are often small and sometimes less than 1 mm in diameter. Cholangiography has been used to help in the identification of accessory ducts in 50 patients included in a prospective trial. X-rays were taken after dissection of the gall bladder from its bed and extravasation of contrast was seen on five occasions (10%) suggesting leakage from divided accessory ducts. The identification of damage to accessory bile ducts in 10% of patients suggests that this may occur more frequently than previously supposed. 相似文献
17.
18.
19.
Samir Kumar Praharaj mbbs md dpm Nishant Goyal mbbs md dpm Sukanto Sarkar mbbs md dpm Dhruv Bagati mbbs Prakriti Sinha mp hil Vinod Kumar Sinha mbbs md dpm 《Psychiatry and clinical neurosciences》2009,63(2):230-234
Reported herein is a case of obsessive–compulsive disorder with persistent and distressing musical obsessions along with other symptoms. Advanced source analysis of electroencephalographic data indicated high spectral power over the bifrontal region. The musical symptoms were resistant to pharmacotherapy but there was some reduction in frequency and duration of musical obsessions with thought-stopping technique. 相似文献
20.
We thank Coceani and L'Abbate for their comments on our paper.We concur that pathophysiology cannot be inferred fromcoronary lumenography alone, and this was one of thekey motivations in conducting the present study. 相似文献