全文获取类型
收费全文 | 553篇 |
免费 | 45篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 7篇 |
妇产科学 | 8篇 |
基础医学 | 87篇 |
口腔科学 | 23篇 |
临床医学 | 43篇 |
内科学 | 214篇 |
皮肤病学 | 11篇 |
神经病学 | 9篇 |
特种医学 | 35篇 |
外科学 | 55篇 |
综合类 | 13篇 |
预防医学 | 32篇 |
眼科学 | 7篇 |
药学 | 34篇 |
肿瘤学 | 20篇 |
出版年
2023年 | 9篇 |
2022年 | 11篇 |
2021年 | 14篇 |
2020年 | 9篇 |
2019年 | 20篇 |
2018年 | 21篇 |
2017年 | 11篇 |
2016年 | 11篇 |
2015年 | 11篇 |
2014年 | 14篇 |
2013年 | 21篇 |
2012年 | 36篇 |
2011年 | 22篇 |
2010年 | 11篇 |
2009年 | 13篇 |
2008年 | 17篇 |
2007年 | 32篇 |
2006年 | 39篇 |
2005年 | 34篇 |
2004年 | 26篇 |
2003年 | 26篇 |
2002年 | 21篇 |
2001年 | 5篇 |
2000年 | 10篇 |
1999年 | 9篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 8篇 |
1985年 | 3篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 4篇 |
1978年 | 9篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1972年 | 3篇 |
1971年 | 5篇 |
1970年 | 4篇 |
1969年 | 11篇 |
1966年 | 4篇 |
排序方式: 共有600条查询结果,搜索用时 109 毫秒
1.
2.
Abdou Elhendy Marcel L. Geleijnse Ron T. van Domburg Jeroen J. Bax Peter R. Nierop Suzan A. M. Beerens Roelf Valkema Eric P. Krenning M. Mohsen Ibrahim Jos R. T. C. Roelandt 《European journal of nuclear medicine and molecular imaging》1997,25(1):69-78
Stress echocardiography has been considered an accurate method for the diagnosis of coronary artery disease in hypertensive
patients and in patients with left ventricular hypertrophy. In contrast, the specificity of myocardial perfusion scintigraphy
in these patients has been questioned. The aim of this study was to compare the accuracy of these two imaging modalities in
conjunction with dobutamine stress test for the diagnosis of coronary artery disease in hypertensive patients with and without
left ventricular hypertrophy. Dobutamine (up to 40 μg kg–1min–1) stress echocardiography in conjunction with sestamibi (MIBI) single-photon emission tomography (SPET) was performed in 84
patients with the diagnosis of systemic hypertension who had been referred for evaluation of myocardial ischaemia. Ischaemia
was defined as new or worsened wall motion abnormalities at echocardiography and reversible perfusion defects at SPET. Significant
coronary artery disease (≥50% luminal diameter stenosis) was detected in 66 patients (79%). The sensitivity, specificity and
accuracy of the ischaemic pattern at echocardiography for the diagnosis of coronary artery disease were 73% (CI 63%–82%),
83% (CI 75%–91%) and 75% (CI 66%–84%), those for MIBI were 67% (CI 57%–77%), 83% (CI 75%–91%) and 70% (CI 60%–80%) respectively
(P = NS vs echocardiography). Significant stenosis was detected in 123 (49%) of the 252 analysed coronary arteries. The sensitivity,
specificity and accuracy of echocardiography for the regional diagnosis of coronary artery disease were 63% (CI 56%–69%),
90% (CI 86%–94%) and 77% (CI 72%–82%). Those for MIBI were 58% (CI 51%–64%), 91% (CI 87%–94%) and 75% (CI 69%–80) respectively
(P = NS vs echocardiography). Left ventricular hypertrophy was detected in 59 patients (70%) by echocardiography and did not
influence the overall or regional specificity of echocardiography or MIBI SPET. It is concluded that in hypertensive patients,
dobutamine stress echocardiography and MIBI SPET have a comparable accuracy for the overall and regional diagnosis of coronary
artery disease. Hypertensive patients with or without left ventricular hypertrophy should not be considered unsuitable candidates
for stress myocardial perfusion scintigraphy.
Received 10 July and in revised form 19 September 1997 相似文献
3.
The possibility that idiotypes (Ids) defined on anti-double stranded DNA (dsDNA) antibodies during active and inactive stages of lupus (1/84 Id and 4/90 Id, respectively) were expressed on anti-DNA antibodies during a subsequent active period (9/90) of the disease was investigated in a lupus patient with lupus cerebritis. Using rabbit (R)-anti-Ids specific to 1/84 Id and 4/90 Id in inhibition assays, the 4/90 Id was shown to be expressed on the framework regions of anti-single stranded DNA (ssDNA) but poorly on co-existing anti-dsDNA antibodies of active (9/90) stage. The 1/84 Id was poorly expressed on both types of 9/90 anti-DNA antibodies. While the 9/90 anti-ssDNA significantly bound to immobilized ssDNA and several single-stranded polynucleotides, only ssDNA inhibited the binding of the anti-ssDNA to ssDNA, suggesting its monospecificity toward ssDNA. Western blot analysis following isoelectric focusing showed that a spectrotype pattern of 4/90 Id-positive 9/90 anti-ssDNA IgG was similar to that of the 4/90 anti-dsDNA, suggesting that they are of related clonal origin. The present study suggests the idiotypic heterogeneity of anti-DNA antibodies and the shift of antigen specificity within an idiotypically related anti-DNA population during exacerbation of the disease. 相似文献
4.
The objectives of this population based study were to quantify the prevalence of depression among adults in Alexandria, to identify some of its determinants as well as to reveal gender differences in its presentation. 300 adults were surveyed in their households (10 from each of 30 clusters of the governorate). The self administered Beck's inventory for usage in primary care settings was used for identifying the depression state. The prevalence rate was 11% with a non significant higher proportion among males. Mean age of depressed subjects was higher than the free Age interval with highest percentage of cases was 50-60 years Epidemiologic variables that were found to be significantly associated with a higher rate of the condition were being divorced or widowed, a positive recent history of stressful life events and having a positive personal history of psychological troubles. On the other hand, examined factors like financial state, working status and whether the person is a bread earner or dependent in the family had no association with the state of depression. Male cases were younger than female ones, they also had a higher mean score on the depression scale. The genders differed significantly in scores of psychopathological parameters related to hopelessness, low self esteem, loss of sexual interest, loss of pleasure, guilt, self reproach and suicidal ideation. The authors recommend active case finding for depression at the primary care level, instituting counseling services for marriage and family relations, intensifying mass media health education directed to mechanisms of coping with life stresses and restudying the gender differences in epidemiology of depression in a large scale community research. 相似文献
5.
Allograft loss in renal transplant recipients with Fabry's disease and activated protein C resistance 总被引:1,自引:0,他引:1
Friedman GS Wik D Silva L Abdou JC Meier-Kriesche HU Kaplan B Bonomini L DeFranco P Lyman N Mulgaonkar S Jacobs M 《Transplantation》2000,69(10):2099-2102
INTRODUCTION: Fabry's disease is associated with an increased incidence of thrombotic events and rejection. Spontaneous thrombosis of a functioning cadaveric renal allograft in a recipient with Fabry's disease prompted prospective evaluation of all transplant candidates with Fabry's disease for hypercoagulability. MATERIALS AND METHODS: Transplant candidates with Fabry's disease were tested for hypercoagulability, analyzed for HLA-type and ABO group, and comorbid conditions suggestive of hypercoagulability. RESULTS: A unique association of Fabry's disease with activated protein C Resistance was documented in a cohort of Caucasian male renal transplant recipients with Fabry's disease. Four of five patients were blood group A and had no significant comorbid conditions suggestive of hypercoagulability. The resistance to activation of protein C (APCR)(+) patients shared HLA loci-B8 and Dr3, although the APCR(-) patients shared HLA loci-B27 and -B38. CONCLUSIONS: Due to the observed increase in the incidence of APCR in our Fabry's cohort, we suggest screening all patients with Fabry's disease for APCR. Because factor V and factor Va receptors are found on vascular endothelium and peripheral blood monocytes, APCR in the presence of Fabry's disease may be a nonimmunological stimulus for rejection. Analysis of HLA typing in patients with Fabry's disease may further elucidate HLA-based association of Fabry's disease and resistance to activated protein C with the risk of thrombosis and rejection. 相似文献
6.
7.
8.
9.
10.
Purpose: The aim of this study was to compare between the effects of resilient liner and clip attachments of bar‐implant‐retained mandibular overdenture on peri‐implant tissues. Materials and methods: In a randomized‐controlled clinical trial, 30 edentulous male patients (mean age 62.5 years) were equally assigned to two groups. In each patient, two implants were inserted in the canine area of the mandible using a two‐stage surgical protocol. After 3 months, the implants were connected with resilient bars. Mandibular overdentures were retained to the bars with either clips (group I) or silicone‐resilient liners (group II). Peri‐implant tissues were evaluated clinically (with regard to plaque scores, gingival scores and probing depths) and radiographically (with regard to peri‐implant vertical and horizontal alveolar bone changes). Evaluations were performed at the time of overdenture insertion (T0), 6 months (T6) and 12 months (T12) after overdenture insertion. Results: After 12 months of using bar‐implant‐retained mandibular overdenture, the resilient liner attachment had significantly decreased peri‐implant plaque score, gingival score, probing depth, vertical and horizontal bone loss when compared with the clip attachment. Conclusion: Within the limitations of this study, and in terms of peri‐implant tissue health of bar‐implant‐retained mandibular overdenture, we recommend resilient liner rather than clip attachment. To cite this article: Elsyad MA, EL Shoukouki AH. Resilient liner vs. clip attachment effect on peri‐implant tissues of bar‐implant‐retained mandibular overdenture: a 1‐year clinical and radiographical study.Clin. Oral Impl. Res. 21 , 2010; 473–480doi: 10.1111/j.1600‐0501.2009.01879.x 相似文献