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   895篇
  免费   31篇
  国内免费   4篇
耳鼻咽喉   7篇
儿科学   25篇
妇产科学   49篇
基础医学   161篇
口腔科学   11篇
临床医学   62篇
内科学   145篇
皮肤病学   20篇
神经病学   34篇
特种医学   53篇
外科学   117篇
综合类   6篇
预防医学   60篇
眼科学   17篇
药学   77篇
中国医学   5篇
肿瘤学   81篇
  2023年   3篇
  2022年   19篇
  2021年   20篇
  2020年   10篇
  2019年   17篇
  2018年   27篇
  2017年   18篇
  2016年   30篇
  2015年   21篇
  2014年   35篇
  2013年   40篇
  2012年   67篇
  2011年   66篇
  2010年   30篇
  2009年   31篇
  2008年   55篇
  2007年   63篇
  2006年   43篇
  2005年   38篇
  2004年   50篇
  2003年   50篇
  2002年   31篇
  2001年   12篇
  2000年   15篇
  1999年   16篇
  1998年   4篇
  1997年   3篇
  1996年   7篇
  1995年   6篇
  1994年   3篇
  1993年   2篇
  1992年   7篇
  1991年   4篇
  1990年   7篇
  1989年   10篇
  1988年   8篇
  1987年   10篇
  1986年   8篇
  1985年   7篇
  1979年   2篇
  1978年   2篇
  1977年   3篇
  1976年   2篇
  1973年   9篇
  1972年   3篇
  1971年   5篇
  1968年   3篇
  1966年   1篇
  1933年   1篇
  1923年   1篇
排序方式: 共有930条查询结果,搜索用时 15 毫秒
61.
The authors assess the incidence of locoregional chronic pain after inguinal hernia repair. One hundred consecutive patients, with a mean age of 65.4 years, suffering from primary monolateral inguinal hernia, underwent suture-less mesh-plug hernioplasty. In all cases the inguinal nerves were identified. In the early postoperative period, a questionnaire was given to all patients in order to assess the frequency, type and intensity of postoperative locoregional pain and the impact of the pain on their quality of life. Sixty patients were available for follow-up with clinical examination and these were given the same questionnaire 2-4 years after hernioplasty. Pain intensity was scored by means of a visual-analogue scale (from 0 to 10). The incidence of locoregional pain after hernioplasty was 13.0% in the early postoperative period and 25.0% after a longer period of follow-up. None of the patients presented recurrent hernia. The symptomatic patients reported mild or moderate neurogenic pain. Severe pain was not reported. On the whole, the presence of mild-to-moderate chronic pain had no impact on the patients' quality of life. Our study confirms the high incidence of locoregional chronic pain even after sutureless mesh-plug hernioplasty, but that this has no serious effects on the patients' quality of life.  相似文献   
62.
We describe a triple procedure combining corneal transplantation, cataract extraction, and intraocular lens implantation in which the continuous curvilinear capsulorhexis (CCC) is performed in a closed system when corneal transparency is sufficient or using an open-sky method when corneal transparency is poor. With the closed system, the CCC is performed first followed by trephination and hydroexpulsion of the nucleus. A Caporossi coaxial forceps is used to reduce the corneal incision to 1.2 mm, preventing the need for sutures. Tunnel formation, which could limit the size of trephination, is avoided. In addition, endothelial cell loss at the periphery of the recipient cornea is reduced. This technique was performed in 10 eyes without intraoperative complications. With the open-sky method, the CCC is created while counterpressure is applied to the center of the lens with a large spatula, reducing posterior pressure and thus the risk of capsule tear. This technique was performed in 9 eyes without intraoperative complications.  相似文献   
63.
64.
65.

Background  

The most important instrument of EU support for the reforms of higher education in the European countries with the final goal of joining the European Higher Education (HE) Area by the year 2010 is TEMPUS (Trans-European Mobility Programme for University Studies). So far, Tempus is the only EU programme providing support for the reform of HE in the Western Balkans.  相似文献   
66.
67.
The present paper describes the case of a patient who developed a B-cell chronic lymphocytic leukemia (B-CLL) 15 months after the diagnosis of polycythemia vera, which had been treated only with phlebotomies. In spite of lymphocytosis and the clinical signs and symptoms of leukemia, the patient exhibited at the same time presumptive elements of polycythemia (high LAP index levels, a high number of neutrophils). Cytogenetic investigations, carried out after the appearance of B-CLL, revealed the presence of an unusual abnormality (18 p+) both in bone marrow not stimulated by mitogens and in PWM-stimulated circulating lymphocytes. This case, which is the ninth of its kind described in the literature, offers some interesting observations about the association between myeloproliferative and lymphoproliferative syndromes.  相似文献   
68.
A case of meningioma of the posterior cranial fossa is reported. The tumor developed 12 years after radiation treatment for a polar spongibolastoma of the cerebellum in an 8-year-old boy. The possible role of the radiation in the oncogenesis of the second tumor is discussed. In light of the information in the literature concerning the malignancy of such postirradiation tumors, the authors recommend careful evaluation for the real necessity of radiation therapy, particularly for children in whom the meninges may be hypersensitive to ionizing radiation.  相似文献   
69.
Classical ligands bind to the extracellular surface of their cognate receptors and activate signaling pathways without crossing the plasma membrane barrier. We selectively targeted the intracellular receptor-G protein interface by using cell-penetrating membrane-tethered peptides. Attachment of a palmitate group to peptides derived from the third intracellular loop of protease-activated receptors-1 and -2 and melanocortin-4 receptors yields agonists and/or antagonists of receptor-G protein signaling. These lipidated peptides--which we have termed pepducins--require the presence of their cognate receptor for activity and are highly selective for receptor type. Mutational analysis of both intact receptor and pepducins demonstrates that the cell-penetrating agonists do not activate G proteins by the same mechanism as the intact receptor third intracellular loop but instead require the C-tail of the receptor. Construction of such peptide-lipid conjugates constitutes a new molecular strategy for the development of therapeutics targeted to the receptor-effector interface.  相似文献   
70.

Background

Little is known about the role of interleukin (IL)-1 in the pathogenesis of cystic fibrosis (CF) lung disease. This study investigated the relationship between IL-1 signalling, neutrophilic inflammation and structural lung changes in children with CF.

Methods

Bronchoalveolar lavage fluid (BALf) from 102 children with CF were used to determine IL-1α, IL-1β, IL-8 levels and neutrophil elastase (NE) activity, which were then correlated to structural lung changes observed on chest computed tomography (CT) scans.

Results

IL-1α and IL-1β were detectable in BAL in absence of infection, increased in the presence of bacterial infection and correlated with IL-8 (p?<?0.0001), neutrophils (p?<?0.0001) and NE activity (p?<?0.01 and p?<?0.001). IL-1α had the strongest association with structural lung disease (p <?0.01) in the absence of infection (uninfected: p?<?0.01 vs. infected: p?=?0.122).

Conclusion

Our data associates IL-1α with early structural lung damage in CF and suggests this pathway as a novel anti-inflammatory target.  相似文献   
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