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   11034篇
  免费   1039篇
  国内免费   56篇
耳鼻咽喉   100篇
儿科学   372篇
妇产科学   323篇
基础医学   1468篇
口腔科学   195篇
临床医学   1089篇
内科学   2471篇
皮肤病学   158篇
神经病学   938篇
特种医学   311篇
外科学   1404篇
综合类   286篇
一般理论   11篇
预防医学   1113篇
眼科学   235篇
药学   671篇
中国医学   28篇
肿瘤学   956篇
  2024年   13篇
  2023年   128篇
  2022年   194篇
  2021年   457篇
  2020年   292篇
  2019年   442篇
  2018年   474篇
  2017年   310篇
  2016年   313篇
  2015年   385篇
  2014年   536篇
  2013年   645篇
  2012年   921篇
  2011年   938篇
  2010年   499篇
  2009年   397篇
  2008年   643篇
  2007年   677篇
  2006年   600篇
  2005年   546篇
  2004年   454篇
  2003年   411篇
  2002年   386篇
  2001年   168篇
  2000年   146篇
  1999年   99篇
  1998年   62篇
  1997年   47篇
  1996年   43篇
  1995年   37篇
  1994年   34篇
  1993年   43篇
  1992年   69篇
  1991年   66篇
  1990年   87篇
  1989年   57篇
  1988年   54篇
  1987年   58篇
  1986年   43篇
  1985年   56篇
  1984年   43篇
  1983年   34篇
  1982年   24篇
  1981年   17篇
  1980年   22篇
  1979年   17篇
  1978年   21篇
  1976年   17篇
  1974年   13篇
  1973年   13篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
951.

Purpose

The aim of this study is to assess the safety and tolerability of Kinesio® Taping (KT) in patients with arm lymphedema.

Method

Medical device clinical study in women with arm lymphedema. Kinesio® Tex Gold bandage was applied by the KT technique. Assessments and interviews were carried out both at the beginning and 4 days after intervention. Skin disorders, reported tolerance and modification of limb volume and function after intervention were assessed. Changes in limb volume and functionality before and after intervention were compared by the Student’s t test and the Wilcoxon Signed-Rank test, considering significant p value <0.05.

Results

Twenty-four women were studied. After intervention, no patient had cutaneous lesions, vesicle or limb hyperthermia, and 4.2 % presented skin peeling and redness. Most patients reported no change in social life and that they felt safer in the daily activity and were very pleased with the treatment. The patients presented improvement of upper limb functionality after intervention (p?<?0.001). No difference of limb volume was found after intervention (p?=?0.639).

Conclusions

Kinesio® Tex Gold bandage by the KT technique proved to be safe and tolerable in patients with lymphedema, with improved functionality and no change of the affected limb volume.
  相似文献   
952.
ICI 198,615 is a representative compound from a new class of peptide leukotriene (LT) receptor antagonists. In isolated guinea pig trachea and parenchymal lung strips, ICI 198,615 demonstrated competitive antagonism of the contractile activity of LTD4 and LTE4 with pA2 values of 10.1 to 9.5, respectively. The compound also appeared to antagonize the contractile activity of LTC4 in guinea pig trachea; however, in the presence of an inhibitor of the metabolism of LTC4 to LTD4, ICI 198, 615 provided a pKB value of 5.3, indicating weak antagonism at the LTC4 receptor. ICI 198,615 was also a potent antagonist of LTC4 and LTD4 in isolated human bronchi and pulmonary veins with pKa values of 9.75 +/- 0.32 to 9.20 +/- 0.24, respectively. When evaluated for activity on a broad variety of non-LT receptors, the compound displayed a minimal selectivity of 6310 and a maximal selectivity of greater than 125,000 for the LTE4 receptor. These in vitro studies indicate that ICI 198,615 is the most potent and selective peptide LT receptor antagonist described to date.  相似文献   
953.
Bleomycin kinetics were determined in 14 children after intravenous bolus and prolonged infusion doses. Plasma and urine bleomycin concentrations were determined by radioimmunoassay. After intravenous bolus, bleomycin concentrations were adequately described by a two-compartment open model with a mean t1/2 alpha and t1/2 beta of 0.3 +/- 0.1 and 3.2 +/- 0.7 hr (mean +/- SEM). Volume of the central compartment and volume of distribution at steady-state (Vss) were 4.3 +/- 0.5 and 9.9 +/- 1.1 l/m2. Total plasma (CLT) and renal (CLR) clearance were 51.8 +/- 6.1 and 33.5 +/- 2.4 ml/min/m2. Three intravenous bolus courses were given to two patients who received more than four courses of cisplatin (greater than 300 mg/m2); CLT and CLR for these courses were 18.0 +/- 3.3 and 8.2 ml/min/m2. Conversely, children under 3 yr old eliminated bleomycin more rapidly than older children. Decline in bleomycin concentrations after seven 24- or 48-hr intravenous infusions was described by a one-compartment model. Mean values for plasma t1/2, Vss, CLT, and CLR were 2.1 +/- 0.1 hr, 11.0 +/- 2.6 l/m2, 57.1 +/- 13.5 ml/min/m2, and 33.2 +/- 6.4 ml/min/m2. One patient received his bleomycin infusion when ureteral obstruction was present; CLT and CLR for this course were 4.8 and 4.1 ml/min/m2. These data indicate that young children eliminate bleomycin more rapidly than older children and that children with impaired renal function may have prolonged elevations in plasma concentration due to reduced bleomycin clearance. Bleomycin disposition in older children is as in adults.  相似文献   
954.

Background

Hospital-associated UTI rates in surgery patients have not improved despite recommendations for reducing indwelling catheter days.

Methods

We performed a retrospective review of institutional NSQIP general surgery patient data, 2006–2015. During this time, a UTI-reduction policy was implemented. Demographics, HA-UTI incidence, CA-UTI incidence, indwelling catheter days, straight catheterization rates, and mortality were examined.

Results

Females had significantly higher risk of HA-UTI. There was no significant change in HA-UTI (X12?=?0.02, p?=?.878) or indwelling catheter days (5.18?±?1.12 days v 3.73?±?0.39 days, p?=?.23). Straight catheterizations among those with HA-UTI increased (0.04?±?0.04 v 0.32?±?0.12, p?=?.029). There was no change in CA-UTI (1.38 v 1.11 CAUTI/1000 patient hospital-days P?=?.555) or in initial indwelling catheter days of patients with CA-UTI (7.2 SD 8.89 v 47.0 SD 7.04 days P?=?.961) after policy implementation.

Conclusions

The reduction policy increased the number of straight catheterizations for patients developing HA-UTI, but did not reduce the number of initial indwelling catheter days, HA-UTI rates, or CA-UTI rates.  相似文献   
955.
The nutritional knowledge of Australian nurses   总被引:3,自引:0,他引:3  
  相似文献   
956.
957.
958.
22q deletion syndrome (22q11.2DS) is most often correlated prenatally with congenital heart disease and or cleft palate. The extracardiac fetal phenotype associated with 22q11.2DS is not well described. We sought to review both the fetal cardiac and extracardiac findings associated with a cohort of cases ascertained prenatally, confirmed or suspected to have 22q11.2DS, born and cared for in one center. A retrospective chart review was performed on a total of 42 cases with confirmed 22q11.2DS to obtain prenatal findings, perinatal outcomes and diagnostic confirmation. The diagnosis was confirmed prenatally in 67% (28/42) and postnatally in 33% (14/42). The majority (81%) were associated with the standard LCR22A‐LCR22D deletion. 95% (40/42) of fetuses were prenatally diagnosed with congenital heart disease. Extracardiac findings were noted in 90% (38/42) of cases. Additional findings involved the central nervous system (38%), gastrointestinal (14%), genitourinary (16.6%), pulmonary (7%), skeletal (19%), facial dysmorphism (21%), small/hypoplastic thymus (26%), and polyhydramnios (30%). One patient was diagnosed prenatally with a bilateral cleft lip and cleft palate. No fetus was diagnosed with intrauterine growth restriction. The average gestational age at delivery was 38 weeks and average birth weight was 3,105 grams. Sixty‐two percentage were delivered vaginally and there were no fetal demises. A diagnosis of 22q11.2 deletion syndrome should be considered in all cases of prenatally diagnosed congenital heart disease, particularly when it is not isolated. Microarray is warranted in all cases of structural abnormalities diagnosed prenatally. Prenatal diagnosis of 22q11.2 syndrome can be used to counsel expectant parents regarding pregnancy outcome and guide neonatal management.  相似文献   
959.
Atrial flutter often results from a macroreentrant circuit that uses anatomic structures within the right atrium as its borders. RF ablation at the site of an obligatory isthmus can eliminate the atrial flutter circuit. The aim of this study was to compare two approaches to atrial flutter ablation: the septal (septal aspect of the tricuspid valve annulus to coronary sinus ostium and Eustachian ridge) approach versus the posterior (inferior vena cava to tricuspid valve annulus) approach. Twenty patients were randomized to either the "septal" or "posterior" approach. Entrainment mapping and/or confirmation of bidirectional isthmus conduction at baseline were performed in those patients in atrial flutter and normal sinus rhythm, respectively. RF ablation was performed with standard catheters and techniques. Crossover was permitted after two lines of RF lesions. Endpoints included acute success rates and fluoroscopy times. There was no statistically significant difference in the success rate between the two approaches using intention-to-treat analysis. Fluoroscopy times in the septal versus posterior approaches were 58.4 +/- 30.3 versus 70.8 +/- 31.1 minutes, respectively (P = 0.7). There was more frequent crossover in patients assigned to the septal approach and the one major complication, atrioventricular block, also occurred using this approach. There was no statistically significant difference in the success rate or fluoroscopy times between the septal and posterior approaches to atrial flutter ablation. However, given the risk of atrioventricular block with the septal approach, the posterior approach should be the preferred initial choice.  相似文献   
960.
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