首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   718431篇
  免费   49642篇
  国内免费   1364篇
耳鼻咽喉   9240篇
儿科学   23517篇
妇产科学   17780篇
基础医学   112225篇
口腔科学   20062篇
临床医学   65483篇
内科学   137410篇
皮肤病学   16405篇
神经病学   50529篇
特种医学   26260篇
外国民族医学   79篇
外科学   106360篇
综合类   14853篇
现状与发展   2篇
一般理论   164篇
预防医学   51948篇
眼科学   16511篇
药学   54781篇
  3篇
中国医学   2381篇
肿瘤学   43444篇
  2021年   5819篇
  2019年   5743篇
  2018年   8234篇
  2017年   6363篇
  2016年   7088篇
  2015年   7890篇
  2014年   10743篇
  2013年   15984篇
  2012年   21485篇
  2011年   22556篇
  2010年   13258篇
  2009年   12453篇
  2008年   20782篇
  2007年   22317篇
  2006年   22676篇
  2005年   21186篇
  2004年   20665篇
  2003年   19593篇
  2002年   19068篇
  2001年   36480篇
  2000年   37048篇
  1999年   30518篇
  1998年   8004篇
  1997年   6769篇
  1996年   7053篇
  1995年   6680篇
  1994年   6147篇
  1992年   23058篇
  1991年   23005篇
  1990年   22370篇
  1989年   22148篇
  1988年   20105篇
  1987年   19477篇
  1986年   18530篇
  1985年   17356篇
  1984年   12730篇
  1983年   10776篇
  1982年   5943篇
  1979年   11535篇
  1978年   8146篇
  1977年   6842篇
  1976年   6611篇
  1975年   7295篇
  1974年   8511篇
  1973年   8159篇
  1972年   7672篇
  1971年   7138篇
  1970年   6882篇
  1969年   6313篇
  1968年   5785篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
42.
43.
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   
44.

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   
45.
46.
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   
47.
48.
49.
50.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号