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   21174篇
  免费   2112篇
  国内免费   1266篇
耳鼻咽喉   155篇
儿科学   723篇
妇产科学   308篇
基础医学   2344篇
口腔科学   342篇
临床医学   2869篇
内科学   3067篇
皮肤病学   235篇
神经病学   1068篇
特种医学   816篇
外国民族医学   6篇
外科学   2633篇
综合类   3216篇
现状与发展   3篇
一般理论   3篇
预防医学   1694篇
眼科学   414篇
药学   2140篇
  18篇
中国医学   969篇
肿瘤学   1529篇
  2024年   76篇
  2023年   293篇
  2022年   707篇
  2021年   1008篇
  2020年   751篇
  2019年   655篇
  2018年   772篇
  2017年   694篇
  2016年   619篇
  2015年   917篇
  2014年   1103篇
  2013年   1034篇
  2012年   1488篇
  2011年   1536篇
  2010年   1089篇
  2009年   838篇
  2008年   1083篇
  2007年   1128篇
  2006年   1043篇
  2005年   958篇
  2004年   729篇
  2003年   678篇
  2002年   618篇
  2001年   549篇
  2000年   418篇
  1999年   378篇
  1998年   213篇
  1997年   217篇
  1996年   160篇
  1995年   126篇
  1994年   140篇
  1993年   108篇
  1992年   205篇
  1991年   184篇
  1990年   151篇
  1989年   143篇
  1988年   160篇
  1987年   114篇
  1986年   128篇
  1985年   121篇
  1984年   103篇
  1983年   67篇
  1982年   57篇
  1981年   66篇
  1979年   97篇
  1978年   56篇
  1974年   57篇
  1973年   73篇
  1972年   58篇
  1971年   62篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
A controlled trial was carried out in 209 primary cadaveric renal transplants to compare the effects of cyclosporine and steroids (double therapy) with those of cyclosporine in lower initial dose, azathioprine, and steroids (triple therapy). Patients have been followed 1-36 months since transplantation. Actuarial two-year graft survival (double 74%, triple 76%) and two-year patient survival (double 90%, triple 93%) were similar for both groups. Further analysis of particular risk factors including age, diabetes, HLA matching, acute renal failure, and use of sequential Minnesota antilymphocyte globulin in patients with delayed graft function also showed similar outcomes with both immunosuppressive regimens. Initial hospitalization time, rate of rejection, incidence of serious infection, and rate of rehospitalization were not different. Mean CsA doses and mean trough whole-blood levels were higher in double-therapy patients at hospital discharge but not by three months posttransplant. There were no differences between the two groups in iothalamate clearance at any time. Hypertension was more frequent six months posttransplant in the triple-therapy group (p less than 0.05). Thus, similar results were obtained with both regimens, and except for hypertension no regimen appeared to have increased side effects up to three years posttransplant.  相似文献   
35.
颞颌关节继发性滑膜炎的临床诊断   总被引:5,自引:0,他引:5  
颞颌关节滑膜炎分为原发性和继发性两种,颞颌关节紊乱综合症的滑膜炎为继发性滑膜炎。本文通过对106例颞颌关节紊乱综合症患者的临床检查、关节许氏位以及关节上腔造影的X线检查,同时对42例进行了关节内窥镜检查,在此基础上探讨了继发性滑膜炎的临床诊断标准.作者认为急性滑膜炎主要是以关节疼痛和滑膜血管的改变为主,慢性滑膜炎的临床症状与滑膜组织改变以及关节骨组织的改变均有关系。  相似文献   
36.
Two patients with ureteric fistulae who were unfit for reconstructive surgery were treated by renal ablation using intra-arterial ethanol, gelfoam fragments and in one case coils. In both cases the fistulae dried-up on the same day and both patients are well and normotensive a year later. Our conclusion is that renal ablation by arterial embolization with ethanol can be a valuable alternative to surgery to treat ureteric fistulae in patients who are poor surgical risks.  相似文献   
37.
低剂量甲基汞在小鼠体内分布及其对细胞周期进程的影响   总被引:3,自引:0,他引:3  
连续90天饮用含甲基汞浓度为1/1000LD50、1/100LD50、1/50LD50和1/10LD50的自来水的雄性昆明小鼠,各脏器中总汞含量均高于对照组(P<0.05~0.005),并且随着染毒剂量增加,脏器中总汞含量也随之增高。同时采用FACScan流式细胞仪和“CellFIT”软件分析脾细胞周期进程,发现除1/1000LD50剂量组外,其余各剂量组从Go/G1时相进入S时相的脾细胞百分数均明显高于对照组(P<0.05),与染毒剂量呈明显正相关。表明连续经口摄入低剂量甲基汞小鼠脾细胞周期进程加快,细胞DNA复制增强。  相似文献   
38.
Intracranial hemorrhage is an uncommon complication of antithrombotic therapy. We present two patients who suffered life-threatening intracranial bleeding as a complication of thrombolytic/anticoagulant treatment. Early diagnosis and treatment appear to be crucial factors for survival. We suggest an approach to perioperative management for intracranial hemorrhage resulting from antithrombotic therapy.  相似文献   
39.
It is well known that lung cancer develops frequently in patients with idiopathic interstitial pneumonia (IIP) (9.8-22.8%). We investigated 4 patients who developed lung cancer among the 28 patients with IIP (14.3%) who were admitted to our hospital from June 1981 to March 1989. Many reports have pointed out the clinical features of lung cancer associated with IIP as male sex, old age, heavy smoking, and poor prognosis. Our 4 series were agreed with these clinical features. Lung cancer associated with IIP have been often reported to occur in the lower and peripheral regions of the lung, and honeycomb structures are frequently seen. But we found that lung cancer in IIP could actually occur in both the lower and upper regions of the lung and does not occur only in the honeycomb structures. There was no obvious dominance of any histological type among the tumors. If lung cancer is suspected in a patient with IIP, tumor markers are of some value for diagnosis, but are not sensitive enough to be used alone.  相似文献   
40.
小鼠卵细胞质内显微注入单精子受精的实验研究   总被引:8,自引:0,他引:8  
杨益寿  熊素芳  龙文  李鸣  夏明珠  汪昌介 《解剖学报》1998,29(4):441-445,I011
为了探讨提高小鼠卵细胞质内单精子注入受精率的方法,选取鼠龄12-14周的健康昆明白小鼠作为精子和卵子的供体,受用ICSI技术,以受精后二细胞卵裂的形成率为指标,了解不同采卵时间,不同微注射针参数及不同培养液对细胞质单精子注入的影响。结果表明,hCG注射后18-19h采卵,用针尖内径为4-5μm,斜面角度为35-40度的微注射针进行ICSI操作受精后卵子置CZB中培养可获得较多的2细胞胚,卵裂率明显  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