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   3266篇
  免费   174篇
  国内免费   14篇
耳鼻咽喉   36篇
儿科学   152篇
妇产科学   272篇
基础医学   326篇
口腔科学   47篇
临床医学   257篇
内科学   668篇
皮肤病学   38篇
神经病学   293篇
特种医学   81篇
外科学   502篇
综合类   13篇
一般理论   1篇
预防医学   130篇
眼科学   97篇
药学   190篇
中国医学   1篇
肿瘤学   350篇
  2023年   8篇
  2022年   17篇
  2021年   58篇
  2020年   34篇
  2019年   46篇
  2018年   77篇
  2017年   54篇
  2016年   55篇
  2015年   74篇
  2014年   89篇
  2013年   140篇
  2012年   178篇
  2011年   196篇
  2010年   114篇
  2009年   91篇
  2008年   186篇
  2007年   242篇
  2006年   242篇
  2005年   254篇
  2004年   245篇
  2003年   235篇
  2002年   188篇
  2001年   33篇
  2000年   35篇
  1999年   29篇
  1998年   42篇
  1997年   24篇
  1996年   35篇
  1995年   42篇
  1994年   30篇
  1993年   35篇
  1992年   24篇
  1991年   22篇
  1990年   14篇
  1989年   13篇
  1988年   14篇
  1987年   16篇
  1986年   20篇
  1985年   12篇
  1984年   22篇
  1983年   25篇
  1982年   16篇
  1981年   21篇
  1980年   15篇
  1979年   8篇
  1978年   16篇
  1977年   18篇
  1976年   8篇
  1974年   7篇
  1973年   7篇
排序方式: 共有3454条查询结果,搜索用时 411 毫秒
31.
A retrospective study was carried out by reviewing the files of 100 patients who had undergone radical mastectomy and 100 patients who had undergone modified radical mastectomy from 1966 to 1975 for the purpose of comparing early and late complications. In each group, 80 patients were involved in long-term follow-up. Immediate postoperative complications—notably seromas, wound infection, and flap necrosis—were found to be considerably fewer following modified radical mastectomy. There was also a significantly lower incidence of late complications, such as limb edema and recurrent infection, after modified radical mastectomy. Since the cure rates achieved by the two radical mastectomy procedures appear to be similar, it is concluded that modified radical mastectomy is the procedure of choice in stages I and II cancer of the breast.
Résumé Nous avons relevé les dossiers de 100 patientes traitées par mammectomie radicale conventionelle et de 100 patientes traitées par mammectomie radicale modifiée et avons comparé les complications post-opératoires observées dans les 2 groupes. Toutes les patientes furent opérées entre 1966 et 1975. Dans chaque groupe, nous avions un recul suffisant chez 80 patientes pour évaluer les résultats à long terme. Les complications post-opératoires, immédiates (sérÔmes, infections de plaie, nécrose de greffe cutanée) ou tardives (lymphoedème du bras, infections à répétition), furent beaucoup plus rares après mammectomie radicale modifiée. Etant donné que les taux de guérison obtenus avec ces 2 opérations semblent Être les mÊmes, nous en concluons que la mammectomie radicale modifiée est l'opération de choix pour traiter les cancers du sein au stade I et II.
  相似文献   
32.
PURPOSE: YKL-40 is a secreted protein that has been reported to be overexpressed in epithelial cancers and gliomas, although its function is unknown. Previous data in a smaller sample set suggested that YKL-40 was a marker associated with a poorer clinical outcome and a genetically defined subgroup of glioblastoma. Here we test these findings in a larger series of patients with glioblastoma, and in particular, determine if tumor YKL-40 expression is associated with radiation response. EXPERIMENTAL DESIGN: Patients (n=147) with subtotal resections were studied for imaging-assessed changes in tumor size in serial studies following radiation therapy. An additional set (n=140) of glioblastoma patients who underwent a gross-total resection was tested to validate the survival association and extend them to patients with minimal residual disease. RESULTS: In the subtotal resection group, higher YKL-40 expression was significantly associated with poorer radiation response, shorter time to progression and shorter overall survival. The association of higher YKL-40 expression with poorer survival was validated in the gross-total resection group. In multivariate analysis with both groups combined (n = 287), YKL-40 was an independent predictor of survival after adjusting for patient age, performance status, and extent of resection. YKL-40 expression was also compared with genetically defined subsets of glioblastoma by assessing epidermal growth factor receptor amplification and loss at chromosome 10q, two of the common recurring aberrations in these tumors, using fluorescent in situ hybridization. YKL-40 was significantly associated with 10q loss. CONCLUSIONS: The findings implicate YKL-40 as an important marker of therapeutic response and genetic subtype in glioblastomas and suggest that it may play an oncogenic role in these tumors.  相似文献   
33.
PURPOSE: To determine the activity of decitabine, a DNA methylation inhibitor, in imatinib-refractory or intolerant chronic myelogenous leukemia. MATERIALS AND METHODS: Thirty-five patients were enrolled in this phase II study (12 in chronic phase, 17 in accelerated phase, and six in blastic phase). Decitabine was administered at 15 mg/m2 intravenously over 1 hour daily, 5 days a week for 2 weeks. DNA methylation was measured using a LINE1 bisulfite/pyrosequencing assay. RESULTS: Complete hematologic responses were seen in 12 patients (34%) and partial hematologic responses in seven patients (20%), for an overall hematologic response rate of 54% (83% in chronic phase, 41% in accelerated phase, and 34% in blastic phase). Major cytogenetic responses were observed in six patients (17%), and minor cytogenetic responses were seen in 10 patients (29%) for an overall cytogenetic response rate of 46%. Median response duration was 3.5 months (range, 2 to 13+ months). Myelosuppression was the major adverse effect, with neutropenic fever in 28 (23%) of 124 courses of therapy. LINE1 methylation decreased from 71.3% +/- 1.4% (mean +/- standard error of the mean) to 60.7% +/- 1.4% after 1 week, 50.9% +/- 2.4% after 2 weeks, and returned to 66.5% +/- 2.7% at recovery of counts (median, 46 days). LINE1 methylation at the end of week 1 did not correlate with subsequent responses. However, at day 12, the absolute decrease in methylation was 14.5% +/- 3.0% versus 26.8% +/- 2.7% in responders versus nonresponders (P = .007). CONCLUSION: Decitabine induces hypomethylation and has clinical activity in imatinib refractory chronic myelogenous leukemia. We hypothesize that the inverse correlation between hypomethylation 2 weeks after therapy and response is due to a cell death mechanism of response, whereby resistant cells can withstand more hypomethylation.  相似文献   
34.
35.
36.
Purpose: To examine the effects of hyperbaric oxygen (HBO) therapy and knockout of toll-like receptor 4 (TLR4) on the outcome of temporary middle cerebral artery occlusion (MCAO) in a mouse model. Materials and Methods: MCAO was induced in anesthetized male C57Bl/6 mice (WT) and TLR4 knockout mice (TLR4?/?) using an intra-arterial filament method. After 30 or 90 min, the filament was removed, and the mice were given either no treatment (WT and TLR4?/- groups) or HBO (WT only). Mice were euthanized 24 h after MCAO, and the brain infarct area was examined using 2,3,5-triphenyltetrazolium chloride (TTC) staining. Results: In the WT group, without treatment, lesion volume was 120 ± 13 mm3 in the mice subjected to 30 min’ MCAO and 173 ± 23 mm3 in the mice subjected to 90 min’ MCAO. Respective values with HBO treatment were 66.5 ± 36.7 mm3 and 53.2 ± 17.2 mm3. The difference was significant only for 90-minute MCAO (p < 0.01, nonparametric test). In the TLR4?/? group (all untreated), lesion volume was 95.9 ± 17.9 after 90 min of MCAO, which was significantly lower than in the untreated WT animals (p < 0.05, nonparametric test). Conclusions: A single treatment of HBO immediately after MCAO followed by 24 h’ reperfusion significantly reduces edema and may improve perfusion. TLR4 knockout protects mice from MCAO damage, but to a lesser extent than HBO treatment.  相似文献   
37.
The verrucous epidermal nevus (VEN) is the most common type of epidermal nevi. As lesions can be disfiguring, treatment is often sought. Many therapeutic approaches have been reported, with variable efficacy and safety. Picosecond (PS) lasers are novel laser devices designated to target small chromophores. A side effect of these lasers is blistering due to epidermal-dermal separation. We aimed to harness this side effect of the PS lasers to treat patients with VEN. The purpose of this study was to report our experience treating VEN using a PS 532-nm laser. We present a retrospective case series of six patients with large VEN who were treated using a PS 532-nm laser (2–6 treatments, 8–10 weeks apart). Response in clinical photographs was assessed by two independent dermatologists and graded on a scale of 0 (exacerbation) to 4 (76–100% improvement). Patient satisfaction was recorded on a scale of 1–5. All patients demonstrated significant improvement. Average improvement was 3.7 on the quartile scale of improvement. Patient satisfaction rate averaged 4.7. The PS 532-nm laser is a promising novel modality for the treatment of large VEN.  相似文献   
38.
39.
For many years, the therapy field was dominated by a focus on the past. In this context, many clinicians were trained to use hypnosis as a tool to explore the past, and there is a rich literature documenting the use of hypnosis as a tool to induce age regression and the uncovering of traumatic memories. This article presents a therapeutic paradigm that focuses on the future. Hypnosis is used to induce creativity, flexibility, and openness to the future. In the context of health care, hypnosis is used to explore the best possible treatment outcome, which may be pharmacological, surgical, or a combination of both as well as other nonsurgical interventions. This article elaborates on the effective use of a therapeutic hypnosis strategy and technique focused on the future.  相似文献   
40.
Currently, two paradigms of mental health promotion are widely accepted; the ‘prevention’ and the “well-being” paradigms. This article discusses the position of the ‘Inoculation’ postulation in mental health promotion. Utilising Meichenbaum's stress inoculation training (SIT) model as an example of the paradigm, the limited reference to inoculation’ within mental health promotion literature is questioned and discussed. It is suggested that the inoculation paradigm is different from the ‘prevention’ and the “well-being” paradigms, both in its theoretical assumptions and its practical approach to mental health promotion; although various ‘prevention”’programs demonstrates that with little, and in some cases, no change such programs could be labelled as possessing an inoculation component. The paper argues for an analysis of the relevance of physical immunization assumptions for inoculation against mental health problems and after outlining a review of past and present trials in conducting physiological inoculation proposes that the inoculation paradigm requires serious and intensive consideration as a possible strategy for improved mental health promotion.  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