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   249篇
  免费   8篇
  国内免费   104篇
儿科学   5篇
妇产科学   23篇
基础医学   20篇
临床医学   80篇
内科学   37篇
皮肤病学   8篇
神经病学   7篇
特种医学   29篇
外科学   8篇
综合类   24篇
预防医学   39篇
眼科学   3篇
药学   64篇
肿瘤学   14篇
  2023年   1篇
  2022年   1篇
  2021年   2篇
  2020年   2篇
  2018年   4篇
  2017年   1篇
  2016年   1篇
  2015年   4篇
  2014年   2篇
  2013年   15篇
  2012年   6篇
  2011年   7篇
  2010年   9篇
  2009年   10篇
  2008年   5篇
  2007年   68篇
  2006年   10篇
  2005年   25篇
  2004年   3篇
  2003年   7篇
  2002年   9篇
  2001年   14篇
  2000年   12篇
  1999年   10篇
  1998年   13篇
  1997年   23篇
  1996年   13篇
  1995年   8篇
  1994年   7篇
  1993年   8篇
  1992年   6篇
  1991年   4篇
  1990年   8篇
  1989年   15篇
  1988年   8篇
  1987年   4篇
  1986年   2篇
  1985年   5篇
  1984年   3篇
  1983年   2篇
  1982年   2篇
  1980年   1篇
  1979年   1篇
排序方式: 共有361条查询结果,搜索用时 15 毫秒
11.
Gelfand  DW; Chen  YM; Ott  DJ 《Radiology》1987,164(2):333-337
A systems approach was employed to improve results of the single-contrast barium enema examination for detection of colonic polyps. Improvements were made in each of the following areas: radiographic-fluoroscopic equipment, fluoroscopic-television images, screen-film combinations, barium suspensions, examination techniques, imaging sequences, and quality controls. Radiologic-endoscopic correlation was undertaken for 137 colonic polyps seen endoscopically in 91 patients. The average age of the patients was 69 years. The sensitivity of the single-contrast examination for detection of all polyps was 80%. Polyps 5-9 mm in size were detected with 66% sensitivity, while 94% of polyps 10 mm or larger were detected. The results indicate that the sensitivity of a suitably performed single-contrast barium enema examination may approach that of the double-contrast study for the detection of colonic polyps, even in an elderly and infirm patient population.  相似文献   
12.
安宫牛黄丸中小檗碱的HPLC法测定   总被引:4,自引:0,他引:4  
本文报道用HPLC法测定黄连及含黄连中成药安宫牛黄丸中小檗碱型生物碱。实验结果表明选用硅胶柱为固定相,以醋酸乙酯—甲酸—乙醇(15:3:2)为流动相,能使样品中四种小檗碱型的生物碱获得最佳分离。用此法测得不同厂家生产的安宫牛黄丸中盐酸小檗碱的含量为0.331~0.456%,平均回收率为97.23%,变异系数为1.2%。  相似文献   
13.
We report a case of cerebral dural sinus thrombosis presenting as acute subarachnoid haemorrhage and clinically mimicking an aneurysmal bleed. Awareness of this rare initial presentation of cerebral venous thrombosis is important and should be considered in the diagnostic work‐up of acute subarachnoid haemorrhage. The radiologist plays a crucial role in making this often unsuspected but important diagnosis to enable prompt appropriate treatment.  相似文献   
14.
Hemolytic uremic syndrome spontaneously arises in a few patients with advanced cancer, but it is more commonly related to the use of certain chemotherapeutic agents. Mitomycin-C is, etiologically, the most common causative agent inducing hemolytic uremic syndrome, in a dose dependent manner. We report this syndrome, attributable to mitomycin-C at a cumulative dose of 40 mg/m2, in a gastric cancer patient. A 42-year-old female with stage III gastric cancer underwent radical gastrectomy and was given mitomycin-C at 10 mg/m2 intravenously every four weeks as adjuvant therapy. Hemolytic uremic syndrome was diagnosed three months after the last dose of mitomycin-C administration. The most prominent symptoms included pallor, hypertension and anasarca, with laboratory evidence of microangiopathic hemolytic anemia, azotemia and hyperkalemia. Her disease was progressive, but fortunately stabilized after staphylococcus column A dialysis. Her disease remained in remission for 24 months from the time of diagnosis, and then relapsed in the form of peritoneal carcinomatosis with partial intestinal obstruction.   相似文献   
15.
Objective : To determine the prevalence and perinatal predictors of cerebral palsy, intellectual impairment, visual impairment and deafness in a cohort of extremely low birthweight (ELBW) infants at two years of age.
Methodology : The study population comprised 199 of the 224 (89%) ELBW infants managed at the Mater's Mothers Hospital, Brisbane, between July 1977 and February 1990 and who survived to two years. The prevalence of cerebral palsy, intellectual impairment, blindness and deafness was measured by clinical, psychometric and audiological assessment and the association with 24 risk factors examined.
Results : Cerebral palsy occurred in 20 children (10%). Risk of cerebral palsy was associated with ventricular dilatation, intraventricular haemorrhage, necrotizing enterocolitis and multiple birth, though only ventricular dilatation (OR 4.41; 95% Cl 1.32-14.8) remained significant in the adjusted analysis. Intellectual impairment occurred in 20 children (10%) and was independently associated with ventricular dilatation (OR 15.0; 95% Cl 2.2-102.8), ventilation F iO2 >80% (OR 3.4; 95% Cl 1.01-11.5), vaginal delivery (OR 3.5; 95% Cl 1.09-11.4) and male sex (OR 6.1; 95% Cl 1.67-22.3). No perinatal predictor was statistically associated with risk of deafness. Retinopathy of prematurity (OR 36.9; 95% Cl 2.8-495.5) was associated with risk of later visual impairment.
Conclusions : Intellectual impairment was associated with a broad range of perinatal variables. Cerebral palsy was associated with fewer variables, all of which were also associated with intellectual impairment. Neurologic injury was associated with male sex and multiple birth, which are not biological insults themselves, but may be markers of susceptibility to injury.  相似文献   
16.
17.
Current approaches to the conceptualization of vulvodynia focus either on issues of sexuality or underlying pathophysiology but tend to neglect the central symptom of pain. An adequate understanding of this condition will not be achieved, however, without examining all three factors and how they interact. A multiaxial pain approach has provided data regarding the intensity, location, temporal pattern, underlying system, and sensory quality of vulvodynic pain. In addition, standardized vulvar pain measurement techniques, including a new device called a vulvalgesiometer, have been developed, making possible the collection of reliable pain ratings. To date, this approach has been promising for the differential diagnosis, classification, and understanding of vulvar pain conditions.  相似文献   
18.
The nature of human orgasm: a critical review of major trends   总被引:1,自引:0,他引:1  
This critical review presents a synthesis of the available theoretical and empirical literatures on human orgasm. Findings from both normal and clinical human populations are included. Two major trends in the literature, the dichotomization of biological and psychological perspectives and the assumption of gender differences, are highlighted. A new multidimensional model of the psychological experience of orgasm is described with a view to futhering a biopsychological approach applicable to both sexes. Clinical applications of this new model are discussed.  相似文献   
19.
套管针连续臂丛阻滞行断指(肢)再植手术35例   总被引:4,自引:1,他引:3  
李杰  郑恒兴  张英民 《医学争鸣》1999,20(10):844-844
0 引言 臂丛阻滞是上肢手术常用的麻醉方法[1].但这种阻滞方法作用时间短,对于较长时间的上肢手术,因反复穿刺而造成局部损伤较大,神经损伤率增高,患者痛苦增加.断指(肢)再植手术[1]是上肢手术中时间较长者,要求阻滞作用完善.为探讨一种阻滞时间灵活、损伤小、作用确切的麻醉方法,我们受连续硬膜外麻醉的启发[1],摸索出连续臂丛阻滞方法,现介绍如下.1 对象和方法1.1 对象 急诊断指(肢)再植手术35(男28,女7)例,年龄18岁~47岁,均因锐器伤而造成指体离断和上肢远端离断,其中1指离断5例,…  相似文献   
20.
多发性大动脉炎的麻醉   总被引:1,自引:0,他引:1  
0引言多发性大动脉炎尤其侵及双侧颈总动脉、双锁骨下动脉及无名动脉罕见,我院心脏外科及血管外科近日联合手术1例该病例,现简述其麻醉特点及特殊处理.1临床资料女性,30岁,50kg,头晕,头昏伴心悸,出汗,双上肢冰凉,麻木,查血压右上肢0/0kPa,右下...  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