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   2139篇
  免费   102篇
  国内免费   6篇
耳鼻咽喉   7篇
儿科学   156篇
妇产科学   21篇
基础医学   180篇
口腔科学   57篇
临床医学   145篇
内科学   374篇
皮肤病学   51篇
神经病学   243篇
特种医学   79篇
外科学   276篇
综合类   300篇
一般理论   1篇
预防医学   58篇
眼科学   90篇
药学   92篇
  3篇
中国医学   13篇
肿瘤学   101篇
  2024年   7篇
  2023年   17篇
  2022年   29篇
  2021年   73篇
  2020年   45篇
  2019年   35篇
  2018年   63篇
  2017年   40篇
  2016年   43篇
  2015年   66篇
  2014年   75篇
  2013年   91篇
  2012年   135篇
  2011年   97篇
  2010年   119篇
  2009年   94篇
  2008年   134篇
  2007年   128篇
  2006年   102篇
  2005年   73篇
  2004年   99篇
  2003年   63篇
  2002年   71篇
  2001年   50篇
  2000年   44篇
  1999年   51篇
  1998年   35篇
  1997年   39篇
  1996年   32篇
  1995年   20篇
  1994年   22篇
  1993年   11篇
  1992年   22篇
  1991年   10篇
  1990年   17篇
  1989年   16篇
  1988年   21篇
  1987年   12篇
  1986年   23篇
  1985年   11篇
  1984年   9篇
  1983年   7篇
  1982年   14篇
  1981年   11篇
  1980年   4篇
  1979年   12篇
  1978年   10篇
  1977年   8篇
  1976年   9篇
  1972年   6篇
排序方式: 共有2247条查询结果,搜索用时 15 毫秒
31.
32.
33.
Psychiatric Quarterly - Patients who abscond from acute inpatient psychiatric wards put themselves and others at risks of variable nature and severity. There is a limited understanding of what...  相似文献   
34.
Structural characteristics are essential for the functioning of many noncoding RNAs and cis‐regulatory elements of mRNAs. SNPs may disrupt these structures, interfere with their molecular function, and hence cause a phenotypic effect. RNA folding algorithms can provide detailed insights into structural effects of SNPs. The global measures employed so far suffer from limited accuracy of folding programs on large RNAs and are computationally too demanding for genome‐wide applications. Here, we present a strategy that focuses on the local regions of maximal structural change between mutant and wild‐type. These local regions are approximated in a “screening mode” that is intended for genome‐wide applications. Furthermore, localized regions are identified as those with maximal discrepancy. The mutation effects are quantified in terms of empirical P values. To this end, the RNAsnp software uses extensive precomputed tables of the distribution of SNP effects as function of length and GC content. RNAsnp thus achieves both a noise reduction and speed‐up of several orders of magnitude over shuffling‐based approaches. On a data set comprising 501 SNPs associated with human‐inherited diseases, we predict 54 to have significant local structural effect in the untranslated region of mRNAs. RNAsnp is available at http://rth.dk/resources/rnasnp .  相似文献   
35.
36.
37.
Varicose veins (VVs) are generally characterized by their elongated, twisted, bulging, superficial appearance on the lower extremities and usually present with acute or chronic venous diseases. Despite diagnostic and surgical advances in the management of VV, patients suffer from post-therapeutic complications and recurrence. We present findings from a retrospective study of a modified treatment modality in patients with varicose veins who attended St. Thomas Institute of Research on Venous Diseases, Changanassery, Kerala. The hospital caters to patients from India and outside. Out of 14,707 patients treated from 1997 till May 2013, 6,350 patients from January to March 2011 were selected for the study from the routine clinical practice (mid-segment) to facilitate follow-up. They were categorized according to Clinical Etiologic Anatomic Pathophysiologic (CEAP) clinical classification system. Baseline data were accrued using a questionnaire. Patients were treated by microfoam sclerotherapy giving a maximum importance to smaller veins, depicting a modified technique of microfoam sclerotherapy (MMFST). This is based on the significance of microscopic venous valves (MVVs) in the development of chronic venous disease (CVD). Follow-up was according to a predefined schedule, and improvements and complications were recorded. A positive family history of VVs was reported in 85.23 % of patients. Half the study population belonged to CEAP clinical class IV. There were no significant complications in patients throughout the 2 to 6 years of follow-up. Recurrence was rarely reported during follow-up and was corrected by repeating the procedure as required during follow-up. MMFST is an innovation in the treatment of VVs based on new principles, with the potential to control and revert the symptoms of CVD, with minimal complications.  相似文献   
38.
Diarrhoea and weight loss are frequently reported adverse events in rheumatoid arthritis (RA) patients receiving the disease-modifying antirheumatic drug (DMARD) leflunomide. According to the available literature these side effects occur mostly during the first 6 months of treatment, are rather mild and rarely lead to treatment withdrawal. In this report, we describe the clinical, endoscopic and histologic findings in two RA patients with severe diarrhoea and important weight loss more than 12 months after starting treatment with leflunomide. In both cases the symptoms were caused by colitis, but one had ulcerative and the other microscopic colitis. Despite treatment with budesonide the complaints only improved after withdrawal of leflunomide, making a causal relationship between this drug and the pathogenesis of colitis probable. The heterogeneous histopathological findings in these two patients, however, do not allow us to draw any definitive conclusions about the mechanism by which leflunomide causes diarrhoea and weight loss in RA patients. We conclude that persistent diarrhoea or weight loss in patients taking leflunomide can be more serious than what is previously reported in the literature. In such cases leflunomide treatment should be stopped and an endoscopic examination of the colon is recommended. Given the long half-life of this drug a washout procedure with cholestyramine should be considered whenever the problem is severe or persistent.  相似文献   
39.
40.
Hodgkin lymphoma (HL) relapsing after allogeneic stem cell transplantation (alloSCT) presents a major clinical challenge. In the present investigation, we evaluated brentuximab vedotin, a CD30-directed Ab-drug conjugate, in 25 HL patients (median age, 32 years; range, 20-56) with recurrent disease after alloSCT (11 unrelated donors). Patients were > 100 days after alloSCT, had no active GVHD, and received a median of 9 (range, 5-19) prior regimens. Nineteen (76%) had refractory disease immediately before enrollment. Patients received 1.2 or 1.8 mg/kg of brentuximab vedotin IV every 3 weeks (median, 8 cycles; range, 1-16). Overall and complete response rates were 50% and 38%, respectively, among 24 evaluable patients. Median time to response was 8.1 weeks, median progression-free survival was 7.8 months, and the median overall survival was not reached. Cough, fatigue, and pyrexia (52% each), nausea and peripheral sensory neuropathy (48% each), and dyspnea (40%) were the most frequent adverse events. The most common adverse events ≥ grade 3 were neutropenia (24%), anemia (20%), thrombocytopenia (16%), and hyperglycemia (12%). Cytomegalovirus was detected in 5 patients (potentially clinically significant in 1). These results support the potential utility of brentuximab vedotin for selected patients with HL relapsing after alloSCT.  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