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   1900篇
  免费   88篇
  国内免费   15篇
耳鼻咽喉   35篇
儿科学   60篇
妇产科学   70篇
基础医学   182篇
口腔科学   54篇
临床医学   174篇
内科学   416篇
皮肤病学   41篇
神经病学   137篇
特种医学   55篇
外国民族医学   1篇
外科学   357篇
综合类   33篇
一般理论   2篇
预防医学   72篇
眼科学   53篇
药学   129篇
中国医学   6篇
肿瘤学   126篇
  2023年   19篇
  2022年   63篇
  2021年   114篇
  2020年   62篇
  2019年   81篇
  2018年   84篇
  2017年   38篇
  2016年   44篇
  2015年   61篇
  2014年   96篇
  2013年   127篇
  2012年   134篇
  2011年   188篇
  2010年   108篇
  2009年   83篇
  2008年   134篇
  2007年   110篇
  2006年   87篇
  2005年   78篇
  2004年   73篇
  2003年   50篇
  2002年   42篇
  2001年   16篇
  2000年   9篇
  1999年   9篇
  1998年   6篇
  1997年   5篇
  1996年   3篇
  1995年   6篇
  1994年   4篇
  1992年   5篇
  1991年   6篇
  1990年   3篇
  1989年   4篇
  1988年   2篇
  1987年   6篇
  1986年   8篇
  1985年   4篇
  1983年   3篇
  1982年   6篇
  1980年   1篇
  1979年   2篇
  1977年   1篇
  1976年   1篇
  1975年   3篇
  1974年   3篇
  1969年   2篇
  1968年   2篇
  1966年   2篇
  1965年   1篇
排序方式: 共有2003条查询结果,搜索用时 31 毫秒
1.
2.

Background

Clear cell renal cell carcinoma (ccRCC) is known to occur across the adult lifetime traversing the spectrum of age-related organismal changes. Little is known as to how the aging process may affect the course of renal cell carcinoma (RCC) and the repertoire of genes involved.

Methods

Using The Cancer Genome Atlas (n?=?436) and Cancer Genomics of the Kidney (n?=?89) datasets, we applied regression analysis to examine associations between patient age and gene expression profiles in ccRCC tumors and normal kidney tissues. Pathway enrichment analysis was performed to identify cellular process that is affected by aging in ccRCC. Moreover, connectivity mapping analysis was used to predict age-dependent response to drug treatments.

Results

Our analysis revealed different age-dependent gene expression spectra in ccRCC and normal kidney tissues. These findings were significant and independently reproducible in both datasets examined. Age up-regulated genes, showing higher expression in older patients, were significantly enriched (false discovery rate <0.05) in normal tissues for pathways associated with immune response and extracellular matrix organization, whereas age up-regulated genes in tumors were enriched for metabolism and oxidation pathways. Strikingly, age down-regulated genes in normal cells were also enriched for metabolism and oxidation, while those in tumors were enriched for extracellular matrix organization. Further in silico analysis of potential drug targets predicted preferential efficacy of Phosphoinositide 3-kinase inhibitor or immunotherapy in association with age.

Conclusion

We report on previously unrecognized associations between age and molecular underpinnings of RCC, including age-associated expression of genes implicated in RCC development or treatment.  相似文献   
3.
4.
5.
6.
The inability to completely mobilize the redundant colon in perineal rectosigmoidectomy (Altemeier's procedure) for full-thickness rectal prolapse is a main contributor to the recurrence rate associated with the procedure. However, the presence of a redundant sigmoid after the Ripstein procedure or other rectal sling operations is the main cause of the high rate of postoperative constipation and stool impaction. Low anterior resection as the definitive treatment is associated with the higher morbidity of laparotomy and the risk of anastomotic leak. We describe a laparoscopic-assisted surgical approach which combines the benefits of completely resecting the redundant sigmoid colon as well as the performance of extraperitoneal anastomosis at the level of the anus. Received: 22 April 1996/Accepted: 16 May 1996  相似文献   
7.

Background and Purpose:   

Management of rib fractures constitutes a major part of the trauma workload of any unit. Rib fractures result in disrupted chest wall mechanics and ventilatory insufficiency. The ability of a lung injury scoring system to predict the degree of respiratory dysfunction after rib fractures was evaluated.  相似文献   
8.
We present MR imaging findings of a 15-year-old girl with a history of chronic back pain, proved by biopsy to be caused by primary extraosseous Ewing sarcoma, extending into the spinal epidural space. We also demonstrate the involvement of the adjacent structures and encroachment on the intervertebral foramina.  相似文献   
9.
A 48‐year‐old male patient with long‐standing ulcerative colitis since February 2001 which was diagnosed by endoscopy, developed acute digital ischemia affecting both hands with fixed colour changes in the left index finger which was followed shortly by digital ulceration. Magnetic resonance angiography (MRA) of both upper limbs showed evidence of vasculitis affecting digital arterioles on both sided and right subclavian occlusion. The patient received pulse methylprednisolone followed by cyclophosphamide pulse therapy, the latter continuing on a monthly basis for 6 months with appreciable improvement and remission of the vasculitic process; follow‐up MRA showed reperfusion of the previously occluded subcalvian artery. To the authors’ knowledge vasculitis complicating the course of ulcerative colitis is a rare association and is only sporadically reported in the literature. This rare entity should be diagnosed early and aggressively treated; MRA is a very promising diagnostic tool that is suitable for both diagnosis and follow‐up of patients with this rare entity.  相似文献   
10.
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