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   902篇
  免费   46篇
  国内免费   33篇
儿科学   28篇
妇产科学   10篇
基础医学   103篇
口腔科学   46篇
临床医学   73篇
内科学   197篇
皮肤病学   17篇
神经病学   30篇
特种医学   136篇
外科学   94篇
综合类   86篇
预防医学   25篇
眼科学   3篇
药学   84篇
中国医学   4篇
肿瘤学   45篇
  2022年   6篇
  2021年   7篇
  2020年   5篇
  2019年   4篇
  2018年   8篇
  2017年   11篇
  2016年   12篇
  2015年   9篇
  2014年   8篇
  2013年   19篇
  2012年   22篇
  2011年   28篇
  2010年   23篇
  2009年   24篇
  2008年   34篇
  2007年   45篇
  2006年   37篇
  2005年   35篇
  2004年   16篇
  2003年   25篇
  2002年   20篇
  2001年   23篇
  2000年   23篇
  1999年   29篇
  1998年   41篇
  1997年   26篇
  1996年   25篇
  1995年   33篇
  1994年   29篇
  1993年   20篇
  1992年   16篇
  1991年   22篇
  1990年   12篇
  1989年   33篇
  1988年   35篇
  1987年   26篇
  1986年   26篇
  1985年   15篇
  1984年   18篇
  1983年   16篇
  1982年   10篇
  1981年   13篇
  1980年   9篇
  1979年   20篇
  1978年   10篇
  1977年   8篇
  1976年   4篇
  1975年   10篇
  1972年   4篇
  1971年   4篇
排序方式: 共有981条查询结果,搜索用时 221 毫秒
31.
32.
OBJECTIVE: To examine whether promoter polymorphisms associated with variation in interleukin-10 (IL-10) production are relevant to the development of rheumatoid arthritis (RA) or Felty's syndrome (FS). METHODS: DNA was obtained from 44 FS patients, 117 RA patients and 295 controls. The promoter region between -533 and - 1120 was amplified by polymerase chain reaction, and polymorphisms detected by restriction enzyme digest or sequence-specific oligonucleotide probing. RESULTS: We found no significant difference in allele or haplotype frequencies between the groups. CONCLUSION: There is no association between FS or RA and these recently identified IL-10 promoter polymorphisms. Other genetic or environmental factors could explain the alterations in IL-10 levels seen in these conditions.   相似文献   
33.
EfectsofelectroacupunctureongastricmucosalbloodflowandtransmucosalpotentialdiferenceinstressratsXUGuanSun1,SUNYong1,WANGZhe...  相似文献   
34.

Background

Limited intimal tears (LITs) of the aorta (Class 3 dissection variant) are the least common form of aortic pathology in patients presenting with acute aortic syndrome (AAS). LITs are difficult to detect on imaging and may be underappreciated.

Objectives

This study sought to describe the frequency, pathology, treatment, and outcome of LITs compared with other AAS, and to demonstrate that LITs can be detected pre-operatively by contemporary imaging.

Methods

The authors retrospectively reviewed 497 patients admitted for 513 AAS events at a single academic aortic center between 2003 and 2012. AAS were classified into classic dissection (AD), intramural hematoma, LIT, penetrating atherosclerotic ulcer, and rupturing thoracic aortic aneurysm. The prevalence, pertinent risk factors, and detailed imaging findings with surgical and pathological correlation of LITs are described. Management, early outcomes, and late mortality are reported.

Results

Among 497 patients with AAS, the authors identified 24 LITs (4.8% of AAS) in 16 men and 8 women (17 type A, 7 type B). Patients with LITs were older than those with AD, and type A LITs had similarly dilated ascending aortas as type A AD. Three patients presented with rupture. Eleven patients underwent urgent surgical aortic replacement, and 2 patients underwent endovascular repair. Medial degeneration was present in all surgical specimens. In-hospital mortality was 4% (1 of 24), and in total, 5 patients with LIT died subsequently at 1.5 years (interquartile range [IQR]: 0.3 to 2.5 years). Computed tomography imaging detected all but 1 LIT, best visualized on volume-rendered images.

Conclusions

LITs are rare acute aortic lesions within the dissection spectrum, with similar presentation, complications, and outcomes compared with AD and intramural hematoma. Awareness of this lesion allows pre-operative diagnosis using high-quality computed tomography angiography.  相似文献   
35.
36.
37.
38.
39.

Background

Plasma removal by washing is an effective approach to prevent transfusion reactions by platelet concentrates (PCs). Recently, washed PCs were released by the Japanese Red Cross Society (JRCS).

Materials and methods

This retrospective multicenter study evaluated the efficacy and safety of released washed PCs (RWPCs) between September 2016 and January 2017 in Japan. The RWPCs were prepared by washing leukoreduced apheresis PCs with the platelet additive solution, BRS-A, using automated cell processors.

Results

Clinical data were obtained from 91 patients and 1210 RWPC transfusions at 50 institutions. The median number of RWPC transfusions per patient was 8 (range, 1–91). RWPCs were used in 94.5% of the patients with a history of recurrent or severe transfusion reactions for preventing such reactions. Responses of RWPCs were evaluated as complete response (91.6%), partial response (8.2%), no-change (0.2%), and progression (0%) and overall response was equal across subgroups divided by patients’ profiles. The median corrected count increment (CCI) at 1 and 24?h post-transfusion were 13.5 (range, 1.9–35.4)?×?109/L and 3.5 (range, ?13 to 53.6)?×?109/L, respectively, and median CCI at 24?h was 5.5 (range, ?13 to 53.6)?×?109/L in patients without risk factors associated with platelet transfusion refractoriness. Transfusion reactions to RWPCs were observed in only nine transfusions (0.7%), all of which were mild allergic reactions.

Conclusion

This study demonstrated that RWPCs were effective and safe in patients with a history of transfusion reactions. Further prospective studies on efficacy together with cost-benefit analysis in RWPCs are needed.  相似文献   
40.
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