首页 | 官方网站   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   64479篇
  免费   8440篇
  国内免费   1427篇
医药卫生   74346篇
  2024年   198篇
  2023年   1475篇
  2022年   1984篇
  2021年   3702篇
  2020年   4201篇
  2019年   3222篇
  2018年   2965篇
  2017年   3265篇
  2016年   3311篇
  2015年   2897篇
  2014年   4868篇
  2013年   5722篇
  2012年   4145篇
  2011年   4278篇
  2010年   3310篇
  2009年   3061篇
  2008年   2959篇
  2007年   3004篇
  2006年   2535篇
  2005年   2122篇
  2004年   1792篇
  2003年   1565篇
  2002年   1241篇
  2001年   1024篇
  2000年   868篇
  1999年   654篇
  1998年   553篇
  1997年   508篇
  1996年   409篇
  1995年   307篇
  1994年   299篇
  1993年   212篇
  1992年   247篇
  1991年   186篇
  1990年   165篇
  1989年   161篇
  1988年   152篇
  1987年   129篇
  1986年   88篇
  1985年   106篇
  1984年   96篇
  1983年   53篇
  1982年   57篇
  1981年   54篇
  1980年   44篇
  1979年   27篇
  1978年   22篇
  1977年   27篇
  1976年   22篇
  1975年   26篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
结核病是由结核分枝杆菌复合群引起的传染性疾病,是全球主要的流行病种之一。利福平是当前最主要的一线抗结核药物,因其长期应用和不规范治疗,利福平耐药逐渐增加,利福喷丁、利福布汀等利福霉素类衍生物在抗结核治疗方面起到了重要作用。基于利福霉素类药物的药理及药动学特性,对该类药物在结核病治疗中进行最优用药选择分析,并对该类药物与其他抗结核药物联用进行综述,旨在为利福霉素类抗结核药物的临床用药提供文献依据。  相似文献   
104.
目的:了解高海拔环境对精神分裂症的影响。方法:对106例高海拔地区精神分裂症患者(高海拔组)的临床特征、疗效、药物副作用进行调查,与同期106例平原精神分裂症患者(平原组)对照。结果:高海拔组临床症状以幻觉、疑病妄想、夸大妄想、紧张冲动行为及焦虑、抑郁等精神症状出现频率较高,而对照组以被害妄想、情感淡漠等精神症状出现频率较高(P<0.01或P<0.05);入院时高海拔组总体病情较重(P<0.01);两组间疗效无显著性差异;高海拔组药物不良反应多于平原组。结论:高海拔地区精神分裂症患者临床特征、总体病情严重程度、药物不良反应与平原地区有一定区别,可能与高海拔环境有关。  相似文献   
105.
The Present and Future of Clinical Psychology in Private Practice   总被引:1,自引:0,他引:1  
This article discusses clinical psychologists' current concerns, challenges, and opportunities in private practice. The future of clinicians in independent practice is presented within two paradigms, namely, psychology as a health profession, and psychology as life enhancement. Finally, the author argues that psychotechnology, corporate clinical psychology, and psychology as life enrichment will evolve within the future of clinical psychological independent practice.  相似文献   
106.
BACKGROUND: The validity of parent reports regarding children's attention-deficit/hyperactivity disorder (ADHD) symptoms has been questioned. This study assessed whether parent reports were as sensitive as teacher reports to document change in ADHD symptoms during clinical trials with atomoxetine. METHODS: Data were compared from two randomized, double-blind, placebo-controlled clinical trials of atomoxetine using different versions (parent or teacher) of the same rating scale (Attention-Deficit/Hyperactivity Disorder Rating Scale-IV [parent or teacher] Version: Investigator Administered and Scored - ADHD RS). Exclusion criteria included history of bipolar disorder, psychosis, seizures, alcohol abuse, or positive drug screen. Patients (6-16 years old) were treated with atomoxetine (titrated to a maximum dose of 1.8 mg/kg/day) administered once daily for up to 7 weeks. Parent and teacher ratings were compared using an analysis of covariance (ANCOVA) model. RESULTS: The analysis (n = 318) showed that treatment effects (mean change, baseline to endpoint) were similar between parent and teacher ratings (total, p = .762; inattention, p = .519; hyperactive/impulsive, p = .955). Effect sizes also were similar based on total scores (parent ratings = .69; teacher ratings = .63). CONCLUSIONS: Parent reports are as sensitive as teacher reports in assessing the efficacy of long-acting pharmacologic treatment for ADHD in children during clinical trials using the nonstimulant atomoxetine.  相似文献   
107.
目的 探讨肺上沟癌的临床特点及放疗疗效和不良反应。方法 回顾性分析 3 3例肺上沟癌住院病人的临床特征和常规放疗的疗效。结果 肺上沟癌占原发性支气管肺癌的 2 9% ,常见症状为 :患侧肩、背和上肢疼痛 ( 78 8% ) ,后 1,2 ,3肋骨或椎骨破坏( 5 7 6% ) ,Horner’s综合征 ( 3 6 7% ) ;少见的症状为 :咳嗽 ( 2 7% ) ,咯血 ( 9% ) ;中位生存期为 8 4月 ;1,3 ,5年生存率分别为 3 5 6% ,12 3 % ,4 6% ;放疗反应可耐受。结论 肺上沟癌相当少见 ,其临床特征基本符合pancoast综合症 ,本病预后差 ,但放疗可缓解疼痛 ,提高生存质量。  相似文献   
108.
BACKGROUND: Computer-assisted image analysis has been proposed for human hair growth studies. METHODS: The performances of Trichoscan, a commercially available automated system combining epiluminiscence microscopy with digital image analysis, developed for office-based hair growth measurements, have been evaluated comparatively on the same skin sites using standardized photographic equipment and calibrated processing for contrast-enhanced phototrichogram (CE-PTG) analysis. This reference method has been validated with scalp biopsies and histological examination of serial sectioning. RESULTS: Besides edge effects, hair fibres escaped the Trichoscan analysis for various reasons including, but not limited to, thickness, pigmentation, closeness and crossing. CONCLUSION: Most of these problems have been identified in the late 1980s and remain largely unsolved by the processing software that was evaluated in 2004. Therefore claims promoting the Trichoscan method for accurate hair measurements in clinical trials on scalp and body hair are not supported by the present investigation. The speed at which the analysis is performed is outweighed by the errors in signal detection. Therefore we suggest that improvements must be clearly documented before Trichoscan is established for quantified diagnostic purposes and detailed hair cycle monitoring during hair trials.  相似文献   
109.
110.
BACKGROUND: The recurrent chronic orofacial swelling caused by orofacial granulomatosis (OFG) can cause significant cosmetic and functional problems but can be prevented if the disease is diagnosed early and promptly treated. Although the enlargement of the lips is described to be the most common presenting complaint, the clinical onset of OFG may be characterized by minor associated mucosal and neurological manifestations, making early diagnosis very difficult or, sometimes, merely presumable. PATIENTS AND METHODS: We retrospectively analyzed the clinical manifestations of 19 patients with OFG, who were examined at our institution between 1998 and 2002, in order to determine their initial manifestations and presenting symptoms. RESULTS: A total of 10 patients showed classical recurrent enlargement of the lips (six lower; four upper) as presenting symptom. In the other nine patients, OFG onset was characterized by transient unilateral facial nerve palsy (two cases), intraoral manifestations (two cases), recurrent swelling of the periorbital area (two cases), of the chin (one case), of the zygomatic area (one case), and of the cheeks (one case). CONCLUSION: Our data underlined that OFG onset could be frequently characterized by widely variable, multiform, and temporary clinical findings. Involvement of atypical sites of the orofacial region and presence of single minor manifestations may occur as presenting symptoms, often preceding the development of traditional clinical findings.  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-23

京公网安备 11010802026262号