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   1680篇
  免费   68篇
  国内免费   90篇
耳鼻咽喉   15篇
儿科学   72篇
妇产科学   19篇
基础医学   250篇
口腔科学   70篇
临床医学   283篇
内科学   279篇
皮肤病学   92篇
神经病学   101篇
特种医学   113篇
外科学   198篇
综合类   69篇
预防医学   82篇
眼科学   15篇
药学   124篇
中国医学   3篇
肿瘤学   53篇
  2018年   14篇
  2017年   17篇
  2016年   18篇
  2015年   20篇
  2014年   31篇
  2013年   44篇
  2012年   30篇
  2011年   27篇
  2010年   58篇
  2009年   38篇
  2008年   34篇
  2007年   89篇
  2006年   34篇
  2005年   37篇
  2004年   32篇
  2003年   43篇
  2002年   26篇
  2001年   38篇
  2000年   39篇
  1999年   40篇
  1998年   39篇
  1997年   57篇
  1996年   41篇
  1995年   48篇
  1994年   41篇
  1993年   33篇
  1992年   35篇
  1991年   22篇
  1990年   38篇
  1989年   53篇
  1988年   35篇
  1987年   38篇
  1986年   33篇
  1985年   36篇
  1984年   17篇
  1983年   19篇
  1982年   15篇
  1981年   15篇
  1980年   13篇
  1979年   17篇
  1978年   17篇
  1977年   16篇
  1976年   18篇
  1975年   16篇
  1973年   13篇
  1968年   13篇
  1966年   16篇
  1965年   18篇
  1963年   13篇
  1959年   15篇
排序方式: 共有1838条查询结果,搜索用时 15 毫秒
21.
Diarrhea is the most frequently reported adverse event in patients treated with mycophenolate mofetil. Twenty-six renal transplant patients on a mycophenolate mofetil-based immunosuppressive regime with persistent afebrile diarrhea were examined. Diarrhea caused a significant rise in FK-506 trough levels despite intake of stable doses, necessitating FK-506 dose reductions of 30% to obtain pre-diarrhea trough levels. In contrast, trough levels of cyclosporine A remained stable without dose adjustments. This suggests that absorption and/or metabolism is differentially altered for FK506 compared with cyclosporine A in patients with diarrhea. In nine patients mycophenolate mofetil was reduced or stopped because of persistent diarrhea without identifiable cause. This resulted in end-stage renal disease because of chronic rejection in two patients, and in acute rejection in two patients, all taking FK506 and steroids. Therefore, dose adjustments of FK506 in patients with diarrhea must be carefully monitored, especially when doses of mycophenolate mofetil are also reduced.  相似文献   
22.
SUMMARY: Peritonitis and exit‐site infections remain the most important limitations to the delivery of continuous ambulatory peritoneal dialysis (CAPD). Contamination of the peritoneum, from endogenous or exogenous sources, is responsible for most peritonitis episodes. Patients usually present with a cloudy bag, although other causes should be distinguished. Clinical suspicion of peritonitis should be followed rapidly by microbiological examination and empirical treatment. Microbiological confirmation allows for subsequent treatment based on sensitivities. Other interventions such as catheter removal may be appropriate in some patients. Exit‐site infections should also be identified and treated early. Peritonitis may be further prevented by adequate exit‐site care, hygienic methods, and techniques to minimise early contamination of the exit site. Mupirocin may also have a role in preventing infections caused by Staphylococcus aureus.  相似文献   
23.
SUMMARY: The continuous replacement of renal function must facilitate fluid and solute homeostasis, nutrition and vital organ function, and, where possible, hasten the recovery of renal function. Difficulties with anticoagulation, biocompatibility, mobility and cost remain obstacles to be overcome. the use of continuous renal replacement therapy (CRRT) to remove systemic inflammatory mediators is yet to be confirmed. Although survival benefits of CRRT over intermittent dialysis remain controversial, the slow continuous removal of fluid, acid and solute has a number of advantages, especially where patients are haemodynamically unstable.  相似文献   
24.
Background and aims Since 1999, the Dutch trauma care has been regionalized into ten trauma systems. This study is the first to review such a trauma system. The aim was to examine the sensitivity of prehospital triage criteria [triage revised trauma score (T-RTS)] in identifying major trauma patients and to evaluate the current level of trauma care of a regionalized Dutch trauma system for major trauma patients.Patients and methods Major trauma patients (n=511) (June 2001–December 2003) were selected from a regional trauma registry database. The prehospital T-RTS was computed and standardized W scores (Ws) were generated to compare observed vs expected survival based on contemporary US- and UK-norm databases.Results The T-RTS showed low sensitivity for the prehospital identification of major trauma patients [34.1% (T-RTS≤10)]. Nevertheless, 78.0% of all major trauma patients were directly managed by the trauma center. These patients were more severely injured than their counterparts at non-trauma-center hospitals (p<0.001). No significant difference emerged between the mortality rates of both groups. The Ws {−0.46 calculated on the US model [95% confidence interval (CI) ranging from −1.99 to 1.07]} [0.60 calculated on the UK model (95% CI ranging from −1.25 to 2.44)] did not differ significantly from zero.Conclusion The trauma center managed most of the major trauma patients in the trauma system but the triage criteria need to be reconsidered. The level of care of the regional trauma system was shown to measure up to US and UK benchmarks.  相似文献   
25.
Objective To investigate the clinical and pathological characteristics of pauci-immune crescent glomerulo~nephritis (PICGN) in Chinese patients. Methods During 13 years (1985-1998), 6400 patients underwent non-transplanting renal biopsy. Twenty-four patients were diagnosed as PICGN. All clinical and laboratory data of these patients were collected from the patients’ records and used for detailed analysis. The diagnosis is based on clinico-pathologic findings. Results Of the 24 patients, 16 were females and 8 were males, with median age of 33 years (ranged 10-76 years). Microscopic polyarteritis (MPA) (33.3%) and systemic vasculitis (8.3%) were the secondary diseases. The incidence of PICGN was 0.38% in renal biopsies and 22.9% in crescentic glomerulonephritis. Clinically, most patients (75.0%) showed rapidly progressive nephritis with enlarged kidneys. At onset, gross hematuria was noted in 58.3% of patients, hypertension in 45.8%, nephrotic syndrome in 41.7%, and oliguria in 25.0%. However, systemic symptoms were rare except for anemia. Pathologically, necrosis of glomerular capillaries (62.5%), infiltration of monocytes and neutrophil cells in glomeruli (66.7%), and vasculitis in the interstitium (53.3%) were observed. In addition, glomerulosclerosis was noted in 45.8%, severe tubular atrophy in 83.3% and interstitial fibrosis in 75.0%. Anti-neutrophil cytoplasmic antibodies (ANCAs) were positive in 52.2%. All patients except two received intensively immunosuppressive therapy. Sixteen patients were available for long-term follow up (median 29.8 months, range 8-92 months). Twelve of them had life-sustaining renal function, four had normal serum creatinine (&lt;124?μmol/L) and only 4 patients were dialysis-dependent. Conclusion PICGN is not rare in China. Early diagnosis and administration of immunosuppressive therapy, particularly in patients with rapidly progressive glomerulonephritis (RPGN), are important for good prognosis.  相似文献   
26.
目的:探讨穴位注射治疗CA的临床疗效及对CA患者免疫功能的影响。方法:149例患者随机分为治疗组(A组)、药物对照组(B组)和空白对照组(C组)。运用激光治疗消除疣体后,A组用卡介菌多糖核酸穴位注射,B组用卡介菌多糖核酸肌肉注射,C组仅行激光消除疣体治疗。分别于治疗前及6个月以后检测患者细胞免疫功能。另设健康人对照组40例,检测项目同上。结果:治疗前与健康人相比,CA患者CD4^+百分率降低,CD8^+百分率升高,CD4^+/CD8^+比值降低,NK细胞活性降低(P〈0.05或P〈0.01)。运用穴位注射卡介菌多糖核酸治疗后,治疗组CD4^+百分率升高,CD8^+百分率降低,CD4^+/CD8^+比值升高,NK细胞活性升高(P〈0.05或P〈0.01)。结论:穴位注射卡介菌多糖核酸疗法对CA的T淋巴细胞亚群、自然杀伤(NK)细胞有良性调节作用;可明显降低尖锐湿疣复发率,提高细胞免疫调节作用,是防止尖锐湿疣复发的机制之一。  相似文献   
27.
从假细锥香茶菜(Rabdosia coetsoides C.Y.Wu)叶分离得到新二萜成分,根据紫外光谱、红外光谱、质谱、核磁共振氢谱及碳谱等分析,推定了化学结构,并经X-射线衍射确证,命名为假细锥甲素。  相似文献   
28.
By means of microsurgical lymph cannulation, skin lymph was sampled in the course of a sodium lauryl sulphate (SLS)-induced irritant contact dermatitis in human volunteers. The lymph cells were isolated by centrifugation, and then characterized immunocytochemically using different monoclonal antibodies, and in the late phase of the skin reaction also by electron microscopy. Analyses of lymph cells before the induction of the contact dermatitis revealed median values of about 60% T cells (CD4/CD8 ratio about 2:1), 4% Langerhans cells (LCs), and 1% B cells. The remainder were varying proportions of erythrocytes and uncharacterized cells. During the skin reaction, and even after resolution of the clinical signs of dermatitis, a relative and absolute increase of T and B cells, as well as of HLA-DR positive cells, paralleled the previously reported increase of LCs; a high percentage of the T cells were CD4 and CD8 negative. In addition, surface markers such as CD11a, CD25, CD54 and CD58 were detected on lymph cells sampled during the irritant skin reaction. Cell rosettes observed in the lymph throughout the experiment were analysed in the late phase of the skin reaction, and showed a central LC with three to five peripheral, in part activated, T cells, ultrastructurally revealing gap junction-like structures between the two cell types. These data indicate that immunocompetent cells in the skin are activated by a variety of non-immunological stimuli such as operative trauma and irritant contact dermatitis.  相似文献   
29.
Clinical and histological patterns of dermatofibromas of the nail apparatus   总被引:1,自引:0,他引:1  
True fibromas develop as painless slow-growing nodular tumours. They may appear in any portion of the nail apparatus. The clinical features vary according to their anatomical site. In contrast, the histological features, consisting of a dermal hypocellular reticular nodule with ill-defined demarcation, were similar in all our patients, and factor XIIIa was negative.  相似文献   
30.
This study reviews the published research on night time eating, including the night eating syndrome (NES) and the nocturnal eating/drinking syndrome (NEDS). Studies were identified by a computerized literature search (PubMed, PsycInfo) and by references from the papers obtained. In addition, published abstracts from recent conferences in the areas of eating disorders and obesity were included. Individual studies were reviewed and their results summarized. Wakeful night time eating appears to be a frequent symptom which is more common among the obese. The data suggest an early age of onset with a chronic course in many patients. There appears to be considerable overlap between NES and NEDS. Treatment studies are sparse. The clinical features of these syndromes, their comorbidities, and their prevalence rates remain a matter of debate. It is unclear if the night eating syndrome presents a distinct entity that is of clinical relevance. The current nosologies may not capture the natural clustering of eating and sleep‐related pathology as it occurs in general population samples. Copyright © 2003 John Wiley & Sons, Ltd and Eating Disorders Association.  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