全文获取类型
收费全文 | 726998篇 |
免费 | 51741篇 |
国内免费 | 1329篇 |
专业分类
耳鼻咽喉 | 9553篇 |
儿科学 | 23928篇 |
妇产科学 | 18231篇 |
基础医学 | 113244篇 |
口腔科学 | 20525篇 |
临床医学 | 66537篇 |
内科学 | 137960篇 |
皮肤病学 | 16342篇 |
神经病学 | 51065篇 |
特种医学 | 26461篇 |
外国民族医学 | 76篇 |
外科学 | 107876篇 |
综合类 | 15311篇 |
现状与发展 | 2篇 |
一般理论 | 173篇 |
预防医学 | 54133篇 |
眼科学 | 16721篇 |
药学 | 55484篇 |
3篇 | |
中国医学 | 2401篇 |
肿瘤学 | 44042篇 |
出版年
2019年 | 5763篇 |
2018年 | 8226篇 |
2017年 | 6378篇 |
2016年 | 7085篇 |
2015年 | 7864篇 |
2014年 | 10708篇 |
2013年 | 16045篇 |
2012年 | 21487篇 |
2011年 | 22494篇 |
2010年 | 13268篇 |
2009年 | 12412篇 |
2008年 | 20903篇 |
2007年 | 22515篇 |
2006年 | 22800篇 |
2005年 | 21336篇 |
2004年 | 20906篇 |
2003年 | 19784篇 |
2002年 | 19241篇 |
2001年 | 37068篇 |
2000年 | 37645篇 |
1999年 | 31020篇 |
1998年 | 8211篇 |
1997年 | 6981篇 |
1996年 | 7261篇 |
1995年 | 6912篇 |
1994年 | 6289篇 |
1993年 | 5761篇 |
1992年 | 23500篇 |
1991年 | 23389篇 |
1990年 | 22756篇 |
1989年 | 22503篇 |
1988年 | 20447篇 |
1987年 | 19788篇 |
1986年 | 18867篇 |
1985年 | 17706篇 |
1984年 | 13012篇 |
1983年 | 11013篇 |
1982年 | 6113篇 |
1979年 | 11825篇 |
1978年 | 8329篇 |
1977年 | 7039篇 |
1976年 | 6738篇 |
1975年 | 7435篇 |
1974年 | 8699篇 |
1973年 | 8321篇 |
1972年 | 7837篇 |
1971年 | 7270篇 |
1970年 | 7027篇 |
1969年 | 6491篇 |
1968年 | 5941篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
Alan. B. Franklin Sarah N. Bevins Jeremy W. Ellis Ryan S. Miller Susan A. Shriner J. Jeffrey Root Daniel P. Walsh Thomas J. Deliberto 《Transboundary and Emerging Diseases》2019,66(2):705-714
Using data on waterfowl band recoveries, we identified spatially explicit hotspots of concentrated waterfowl movement to predict occurrence and spatial spread of a novel influenza A virus (clade 2.3.4.4) introduced from Asia by waterfowl from an initial outbreak in North America in November 2014. In response to the outbreak, the hotspots of waterfowl movement were used to help guide sampling for clade 2.3.4.4 viruses in waterfowl as an early warning for the US poultry industry during the outbreak . After surveillance sampling of waterfowl, we tested whether there was greater detection of clade 2.3.4.4 viruses inside hotspots. We found that hotspots defined using kernel density estimates of waterfowl band recoveries worked well in predicting areas with higher prevalence of the viruses in waterfowl. This approach exemplifies the value of ecological knowledge in predicting risk to agricultural security. 相似文献
72.
73.
K. Miura S. Yamaoka K. Arizono S. Ohba T. Koga T. Kawasaki N. Yoshida I. Asahina 《The British journal of oral & maxillofacial surgery》2019,57(6):529-535
Our aim was to evaluate the long-term skeletal stability of the mandible in 21 patients after orthognathic surgery with physiological positioning. The measurement points SNB, B point (X, Y), Pog (X, Y), and the angle of the ramus were measured on cephalometric photographs to assess skeletal stability preoperatively, immediately after operation, and one and two years postoperatively. In addition, we evaluated the clinical symptoms of disorders of the temporomandibular joint (TMJ). The analysis of the cephalometric photographs showed that SNB, B point X, and Pog X showed no significant differences among the postoperative time points. On the other hand, B point Y and Pog Y showed no significant differences throughout the study period. We compared the angle of the ramus before operation and two years postoperatively, and no significant difference was found. In addition, no cases showed any pathological symptoms of disorders of the TMJ two years postoperatively. The long-term stability after orthognathic surgery with physiological positioning was confirmed, and it seems to be a reliable orthognathic treatment in patients with mandibular prognathism. 相似文献
74.
M. Iachina P.M. Ljungdalh R.G. Sørensen L. Kaerlev J. Blaakær O. Trosko N. Qvist B.M. Nørgård 《Clinical oncology (Royal College of Radiologists (Great Britain))》2019,31(2):115-123
Aims
To examine the influence of pre-existing psychiatric disorder on the choice of treatment in patients with gynaecological cancer.Materials and methods
The analyses were based on all patients who underwent surgical treatment for endometrial, ovarian or cervical cancer who were registered in the Danish Gynecological Cancer Database in the years 2007–2014 (3059 patients with ovarian cancer, 5100 patients with endometrial cancer and 1150 with cervical cancer). Logistic regression model and Cox regression model, adjusted for relevant confounders, were used to estimate the effect of pre-existing psychiatric disorder on the course of cancer treatment. Our outcomes were (i) presurgical oncological treatment, (ii) macroradical surgery for patients with ovarian cancer, (iii) radiation/chemotherapy within 30 days and 100 days after surgery and (iv) time from surgery to first oncological treatment.Results
In the group of patients with ovarian cancer, more patients with a psychiatric disorder received macroradical surgery versus patients without a psychiatric disorder, corresponding to an adjusted odds ratio of 1.24 (95% confidence interval 0.62–2.41) and the chance for having oncological treatment within 100 days was odds ratio = 1.26 (95% confidence interval 0.77–2.10). As for patients with endometrial cancer, all outcome estimates were close to unity. The adjusted odds ratio for oncological treatment within 30 days after surgery in patients with cervical cancer with a history of psychiatric disorder was 0.20 (95% confidence interval 0.03–1.54).Conclusions
We did not find any significant differences in the treatment of ovarian and endometrial cancer in patients with pre-existing psychiatric diagnoses. When it comes to oncological treatment, we suggest that increased attention should be paid to patients with cervical cancer having a pre-existing psychiatric diagnosis. 相似文献75.
76.
77.
C. M. de Bont N. Eerden W. C. Boelens G. J. M. Pruijn 《Clinical and experimental immunology》2020,199(1):1-8
Neutrophils can form neutrophil extracellular traps (NETs) to capture microbes and facilitate their clearance. NETs consist of decondensed chromatin decorated with anti-microbial proteins. Here, we describe the effect of neutrophil proteases on the protein content of NETs. We show that the neutrophil serine proteases degrade several neutrophil proteins associated with NETs. Interestingly, the anti-bacterial proteins associated with NETs, such as myeloperoxidase, calgranulin B and neutrophil elastase (NE), seem to be less susceptible to proteolytic degradation than other NET proteins, such as actin and MNDA. NETs have been proposed to play a role in autoimmune reactions. Our data demonstrate that a large number of the autoepitopes of NET proteins that are recognized by autoantibodies produced by systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA) patients are also removed by the proteases. In conclusion, neutrophil serine proteases have a major impact on the NET proteome and the proteolytic changes of NET-associated proteins may counteract autoimmune reactions to NET components. 相似文献
78.
Fast,sensitive and specific diagnosis of infections with Leishmania spp. in formalin‐fixed,paraffin‐embedded skin biopsies by cytochrome b polymerase chain reaction
下载免费PDF全文
![点击此处可从《The British journal of dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
M. Gebhardt B. Ertas T.M. Falk N. Blödorn‐Schlicht D. Metze A. Böer‐Auer 《The British journal of dermatology》2015,173(5):1239-1249
79.
80.