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   2325篇
  免费   127篇
  国内免费   10篇
耳鼻咽喉   34篇
儿科学   42篇
妇产科学   17篇
基础医学   253篇
口腔科学   62篇
临床医学   213篇
内科学   734篇
皮肤病学   75篇
神经病学   187篇
特种医学   57篇
外科学   292篇
综合类   12篇
一般理论   1篇
预防医学   154篇
眼科学   51篇
药学   116篇
中国医学   3篇
肿瘤学   159篇
  2023年   22篇
  2022年   29篇
  2021年   48篇
  2020年   23篇
  2019年   46篇
  2018年   60篇
  2017年   43篇
  2016年   35篇
  2015年   51篇
  2014年   39篇
  2013年   39篇
  2012年   81篇
  2011年   84篇
  2010年   67篇
  2009年   50篇
  2008年   105篇
  2007年   64篇
  2006年   90篇
  2005年   73篇
  2004年   97篇
  2003年   93篇
  2002年   104篇
  2001年   114篇
  2000年   91篇
  1999年   78篇
  1998年   27篇
  1997年   38篇
  1996年   32篇
  1995年   16篇
  1994年   21篇
  1993年   23篇
  1992年   73篇
  1991年   45篇
  1990年   61篇
  1989年   58篇
  1988年   42篇
  1987年   45篇
  1986年   35篇
  1985年   47篇
  1984年   36篇
  1983年   14篇
  1982年   13篇
  1979年   17篇
  1978年   16篇
  1977年   18篇
  1974年   19篇
  1973年   24篇
  1972年   15篇
  1970年   17篇
  1967年   12篇
排序方式: 共有2462条查询结果,搜索用时 0 毫秒
61.
BackgroundRepeat hepatectomy has been recognized as an effective treatment for hepatic malignancies, and a sheet type adhesion barrier, Seprafilm® has increasingly been used during hepatectomy to ease future relaparotomy. However, there is not yet sufficient evidence to support the safety of use of Seprafilm in liver surgery.MethodsData of 151 patients who had undergone open hepatectomy were retrospectively reviewed and the incidence of major abdominal morbidity was compared between patients in whom Seprafilm had and had not been used.ResultsSeprafilm was used in 108 patients (Seprafilm group) and no adhesion barrier was used in 43 patients (comparison group). There was no significant difference in the rate of major abdominal morbidities between the two groups (Seprafilm vs. comparison: 10% vs. 16%, P = 0.403). Although the Seprafilm group showed a tendency toward increased incidence of bile leakage (7% vs. 2%), and placement of Seprafilm on the hepatoduodenal ligament or on the visceral surface of the liver seemed to be associated with an increased incidence of major morbidity, multivariate analysis showed no significant correlation between the use of Seprafilm and postoperative major abdominal morbidity.ConclusionUse of Seprafilm may not increase the risk of major abdominal morbidity in liver surgery.  相似文献   
62.
63.

Background

To evaluate the long-term safety of subcutaneous immunotherapy with TO-204, a standardized house dust mite (HDM) allergen extracts, we conducted a multicenter, open label clinical trial.

Methods

Japanese patients aged 5–65 years were eligible for the study, if they had HDM-induced allergic rhinitis (AR), allergic bronchial asthma (BA), or both. TO-204 was administered in a dose titration scheme, and the maintenance dose was determined according to the predefined criteria. The treatment period was 52 weeks, and patients who were willing to continue the treatment received TO-204 beyond 52 weeks. This clinical trial is registered at the Japan Pharmaceutical Information Center (Japic CTI-121900).

Results

Between July 2012 and May 2015, 44 patients (28 with AR and 16 with allergic BA) were enrolled into the study. All patients were included in the analysis. The duration of treatment ranged from 23 to 142 weeks and the median maintenance dose was 200 Japanese allergy units (JAU). Adverse events occurred in 22 patients (50%). The most common adverse event was local reactions related to the injection sites. Four patients experienced anaphylactic reactions when they were treated with the dose of 500 JAU. Two patients experienced anaphylactic shock with the doses of 1000 JAU at onset. These 6 patients could continue the study with dose reduction.

Conclusions

Safety profile of TO-204 was acceptable in Japanese patients with HDM-induced AR or allergic BA. Higher doses should be administered carefully, because the risk of anaphylaxis increased at doses of 500 or 1000 JAU.  相似文献   
64.
65.
66.

Objectives

The number of teeth has frequently been used as an indicator of oral health in investigations of food intake; however, this measure does not represent the efficacy of the masticatory performance. Masticatory performance may be more important for food selection and avoidance than number of remaining teeth. The aim of this study was to investigate the association of occlusal force with habitual dietary intakes in independently living older Japanese.

Methods

The study population was 757 community-dwelling people aged 69–71 years old. Bilateral maximal occlusal force in the intercuspal position was measured with pressure-sensitive sheets. Removable denture wearers kept their dentures in place during the measurements. Dietary habits during the preceding month were assessed using a brief-type self-administered diet history questionnaire that measures consumption frequencies of selected food commonly consumed and calculates energy-adjusted dietary intakes. Linear trends of food and nutrient intakes with decreasing occlusal force were tested after adjusting for gender and socioeconomic factors.

Results

After adjusting for socioeconomic status and the number of remaining teeth, decline of occlusal force was significantly associated with lower intakes of vegetables, vitamins A, C, B6, folate, and dietary fibre (P for trend < 0.05). In contrast, number of teeth was significantly associated only with calcium and zinc, controlling for occlusal force.

Conclusions

It is concluded that occlusal force was significantly associated with intakes of vitamins and dietary fibre rather than number of remaining teeth in independently living older Japanese.  相似文献   
67.
68.
69.
During AEI zeolite synthesis using acid treated FAU (AcT-FAU), we found the recrystallization of high-silica FAU with high crystallinity and Si/Al ratio of 6.1 using N,N-dimethyl-3,5-dimethylpiperidinium hydroxide (DMDMPOH) after 2 h, followed by the crystallization of AEI via FAU-to-AEI interzeolite conversion at a longer synthesis time. In order to understand the formation mechanism of high-silica FAU and generalize its direct synthesis, we have investigated this synthesis process. An analysis of the short-range structure of AcT-FAU revealed that it has an ordered aluminosilicate structure having a large fraction of 4-rings despite its low crystallinity. The changes in the composition of the products obtained at different synthesis times suggested that DMDMP+ plays a certain role in the stabilization of the FAU zeolite framework. Moreover, the results of thermogravimetric analysis showed that the thermal stability of DMDMP+ changed with the zeolite conversion. To the best of our knowledge, this is the first study to clarify the structure-directing effect of DMDMP+ on FAU zeolite formation.

A high-silica FAU was obtained during FAU-to-AEI interzeolite conversion using acid treated FAU.  相似文献   
70.

Background

Appropriate goal‐oriented treatment strategies are important for optimal treatment outcomes and may prevent under‐treatment. As treatment goals vary by patient, a study to examine treatment goals is more meaningful when patients and their physicians are paired. There has not been any study that examines alignment between paired psoriasis patients and physicians in real‐world clinical practice using skin clearance as a treatment goal indicator.

Objectives

To evaluate treatment goal alignment between psoriasis patients and their paired physicians, and to quantitatively identify factors associated with goal misalignment.

Methods

The study was a nationwide multicenter cross‐sectional observational study. Subjects were physician‐reported moderate‐to‐severe psoriasis patients with a history of systemic treatments, directly paired with their treating physicians. Subjects completed surveys independently. Treatment goals included seven categories, and patient–physician pairs were grouped as ‘aligned’ or ‘misaligned’ when the answers were the same or different, respectively.

Results

A total of 425 pairs (mean response rate, 94.7%) of responses were collected from 54 sites (64.8% general practitioners or clinics; 35.2% university or large hospitals). Treatment goal misalignment was found in 67.9% of the patient–physician pairs. The misalignment was mainly ‘patient predominant’ (60.9%) indicating that patients had higher goals (‘complete clearance’) than physicians. In the multivariate logistic regression analyses, patients’ treatment expectation for ‘complete clearance’ [odds ratio (OR): 1.927; 95% confidential interval (CI): 1.232–3.016] and physician rating of ‘level of understanding on treatment options’ being low (OR: 1.552, 95% CI; 1.082–2.227) were significant factors for treatment goal misalignment.

Conclusions

The majority of treatment goal misalignment was found between paired psoriasis patients and their treating physicians in Japan. The most important contributing factors to misalignment were patients’ treatment expectation for ‘complete clearance’ and physicians’ rating of their patients’ ‘level of understanding on treatment options’ being low.  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