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   635篇
  免费   24篇
  国内免费   8篇
耳鼻咽喉   38篇
儿科学   22篇
妇产科学   21篇
基础医学   55篇
口腔科学   20篇
临床医学   43篇
内科学   126篇
皮肤病学   6篇
神经病学   24篇
特种医学   70篇
外科学   108篇
综合类   28篇
预防医学   17篇
眼科学   18篇
药学   37篇
中国医学   3篇
肿瘤学   31篇
  2024年   1篇
  2023年   1篇
  2022年   1篇
  2021年   6篇
  2020年   5篇
  2019年   7篇
  2018年   12篇
  2017年   16篇
  2016年   13篇
  2015年   12篇
  2014年   20篇
  2013年   33篇
  2012年   52篇
  2011年   45篇
  2010年   31篇
  2009年   34篇
  2008年   55篇
  2007年   68篇
  2006年   50篇
  2005年   54篇
  2004年   52篇
  2003年   33篇
  2002年   25篇
  2001年   7篇
  2000年   8篇
  1999年   7篇
  1998年   2篇
  1997年   3篇
  1996年   2篇
  1993年   1篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1988年   1篇
  1985年   1篇
  1983年   2篇
  1982年   1篇
  1973年   2篇
排序方式: 共有667条查询结果,搜索用时 15 毫秒
81.
82.
83.
BACKGROUND AND AIMS: Children make excellent candidates for day case surgery. Satisfaction is an important measure of the outcome. The aim of this study was to establish the degree of parental satisfaction with day-case surgery for their children. MATERIALS AND METHODS: Parents of one hundred children were questioned. They were asked to answer questions on their level of satisfaction in several areas; communication with doctors (surgeon and anesthesiologist), physical conditions, staff's care, patients' problems and 2 open ended questions. RESULTS: Parents were most satisfied with nursing care and most dissatisfied with physical conditions. Ninetyseven per-cent of parents stated that, if given a choice they would opt for day case surgery for their child again. CONCLUSIONS: There is a high rate of satisfaction with day case surgery, however, considerable effort is needed to prepare better physical conditions, better time schedule organizations, more anesthesia outpatient clinic consultations.  相似文献   
84.
85.
Studies have been demonstrating Pfaffia paniculata root (Brazilian ginseng) anticarcinogenic activities. We evaluated its chemopreventive effects on preneoplastic hepatic lesions. BALB/c aged-15 days received 10mug/g of diethylnitrosamine carcinogen, i.p. They were fed with the powdered root added to the diet: 0.5, 2 or 10% during 27 weeks. After being sacrificed, the macroscopic lesions in the livers were examined. Preneoplastic or neoplastic lesions were measured, quantified and classified morphologically. The treatment reduced the incidence, mean area and number of lesions, indicating an inhibitory effect of these roots on hepatocarcinogenesis promotion or progression steps.  相似文献   
86.
The aim of the current study is to investigate hearing function in patients with allergic rhinitis. Fifty-eight patients with positive skin prick test (Group 1) (116 ears) and 31 subjects with negative skin prick test (62 ears) as group 2 were included. Pure tone audiometry at 250, 500, 1000, 2000, 4000 and 8000 Hz and immittance measures, including tympanometry and acoustic reflex tests, were performed in both groups. There was statistically significant difference between pure-tone threshold of the group 1 and group 2 at 8000 Hz (p< 0.05). Based on our study, the patients with allergic rhinitis had better hearing than the control group at 8000 Hz.  相似文献   
87.
The most common form of renal involvement in Sjögrens syndrome (SS) is tubulointerstitial nephritis. Renal dysfunction is usually mild and subclinical. Glomerulonephritis (GMN) is rare in patients with SS. We report a 28-year-old multigravida patient with primary Sjögrens syndrome (pSS) and associated manifestations, who presented with acute renal failure in the 20th week of her fifth pregnancy. The complaints and clinical findings, positive Schirmers test, findings of dry eye on ophthalmologic examination, and the salivary gland biopsy were compatible with SS. The patient exhibited no other clinical or laboratory findings indicative of other collagenous disease and/or rheumatoid arthritis. She refused renal biopsy, hesitating for fear of fetal loss; thus, based on the clinical and laboratory findings indicating rapidly progressive GMN and vasculitis, prednisolone, plasmapheresis, and one dose of cyclophosphamide were administered during the pregnancy. Hemodialysis five times weekly was performed. At the 28th week of gestation, she underwent a cesarean section due to early rupture of membranes and fetal distress. A healthy male boy was delivered. The renal biopsy performed 2 weeks after labor revealed mesangial proliferative glomerulonephritis. After the fourth cyclophosphamide treatment, her urinary output increased and she was discharged from the hemodialysis program. She remains in follow-up at our outpatient clinic free of hemodialysis for 4 months. This is the first report of mesangial proliferative GMN requiring dialysis in a pregnant pSS patient that has featured good maternal and fetal outcomes.  相似文献   
88.
89.
This study was planned to investigate the normal reference values of myocardial performance index (MPI) obtained by tissue Doppler echocardiography (TDE) and the agreement between MPI measured by TDE and conventional MPI measured by pulsed-wave Doppler (PWD) in healthy subjects and patients with heart failure (HF). Two hundred and three patients with HF and 190 healthy subjects were enrolled in this study. Isovolumic contraction and relaxation time (ICT and IRT) and ejection time (ET) were measured from mitral inflow and left ventricular (LV) outflow. Tissue Doppler echocardiography recordings were obtained at the septal, lateral, inferior, and anterior of the mitral annulus and same time intervals were measured. Myocardial performance index was calculated. The functional capacity of the patients with HF was determined according to New York Heart Association classification. TDE-MPI values were higher than conventional PWD-MPI values in both groups (53% ± 8% vs 48% ± 11%, P < 0.0001 in the healthy subjects; 84% ± 21% vs 72% ± 19%, P <0.0001 in the patients with HF). Moderate agreement was found between PWD-MPI and LV mean TDE-MPI in both groups. In identifying patients with moderately or severely decreased LV ejection fraction, TDE-MPI had higher cutoff values than conventional PWD-MPI, and TDE-MPI had higher specificity, sensitivity, negative predictive value, and diagnostic accuracy. In patients with HF, TDE-MPI had a stronger correlation with LV ejection fraction and functional capacity than did PWD-MPI. TDE-MPI is an alternative to conventional PWD-MPI in assessment of cardiac function. However, the higher MPI cutoff points should be considered when this method is used for the evaluation of cardiac function.  相似文献   
90.
Certain occupational groups are known to be at particularly high risk of developing allergic diseases. The objective of the present study was to evaluate the prevalence of allergic diseases among working adolescents. The International Study of Asthma and Allergies in Childhood questionnaire was used. Four hundred and thirty six adolescents working in motor, lathe-finish, coiffure and textile and 366 high school students as control group were enrolled to the study. Mean age was 16.8 +/- 1.2 years and 82.9% of them were male. There was no significant difference among groups for ever and current wheezing while doctor diagnosed asthma was higher in lathe- finish group (p = 0.036). Family history of allergy, history of allergic rhinitis, and active smoking were found to be risk factors for asthma and related symptoms. Working in coiffure (p = 0.054), and textile (p = 0.003) were significant risk factors for ever allergic rhinitis. Working in lathe finish (p = 0.023), coiffure (p = .002), and textile (p < 0.001) were associated with a higher risk for current allergic rhinitis. Working in coiffure was a risk factor for ever eczema (p = 0.008) and doctor diagnosed eczema (p = 0.014). It was concluded that working in lathe-finish was associated with doctor diagnosed asthma and active smoking was a risk factor for asthma and related symptoms. Working in coiffure, textile and lathe- finish were risk factors for rhinitis, and working in coiffure was a risk factor for eczema. Preventive measures should be taken at the onset of employment in order to prevent or reduce the detrimental effects of exposures in these occupational groups.  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