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   121787篇
  免费   9206篇
  国内免费   3052篇
耳鼻咽喉   1243篇
儿科学   7200篇
妇产科学   3802篇
基础医学   13668篇
口腔科学   1568篇
临床医学   13203篇
内科学   20917篇
皮肤病学   2366篇
神经病学   10506篇
特种医学   2721篇
外国民族医学   3篇
外科学   11110篇
综合类   17128篇
现状与发展   15篇
预防医学   7325篇
眼科学   2236篇
药学   6159篇
  56篇
中国医学   11014篇
肿瘤学   1805篇
  2024年   359篇
  2023年   2168篇
  2022年   4477篇
  2021年   5904篇
  2020年   5413篇
  2019年   4259篇
  2018年   4300篇
  2017年   4407篇
  2016年   4518篇
  2015年   4299篇
  2014年   8377篇
  2013年   8657篇
  2012年   6813篇
  2011年   7944篇
  2010年   6147篇
  2009年   5958篇
  2008年   5795篇
  2007年   5905篇
  2006年   5328篇
  2005年   4407篇
  2004年   3753篇
  2003年   3327篇
  2002年   2285篇
  2001年   2075篇
  2000年   1798篇
  1999年   1675篇
  1998年   1378篇
  1997年   1291篇
  1996年   1239篇
  1995年   1203篇
  1994年   1022篇
  1993年   915篇
  1992年   827篇
  1991年   642篇
  1990年   593篇
  1989年   495篇
  1988年   495篇
  1987年   443篇
  1986年   387篇
  1985年   504篇
  1984年   415篇
  1983年   258篇
  1982年   338篇
  1981年   305篇
  1980年   248篇
  1979年   205篇
  1978年   128篇
  1977年   101篇
  1976年   85篇
  1975年   39篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
目的 :研究SideropenicDysphagla (S -D)综合征膜性蹼产生的机制。方法 :回顾分析S -D综合征2 6例的临床资料。结果 :影像学检查显示膜性蹼在颈段食道前壁呈 2mm深的模样陷凹。血液学检查为缺铁性低血红蛋白性贫血改变。结论 :缺铁性贫血是S -D综合征的原因 ,铁剂治疗有效  相似文献   
62.
目的 评价Manning标准诊断肠易激综合征(IBS)的真实性。方法 采用自行设计的调查表对499例对象进行调查。结果 1.随着Manning标准中结合指标数的增多,IBS组与非溃疡性消化不良及溃疡性结肠炎组鉴别的灵敏度及其95%CI明显下降,特异度及其95%CI明显上升,同时阳性预测值、阳性似然比及阴性似然比也明显上升。2.符合Manning标准中二项以上结合指标,IBS组就具有较好与健康对照组鉴别的灵敏度及其95%CI、特异度及其95%CI。结论 Manning标准中需要3项以上结合指标可较好地使IBS与非溃疡性消化不良或溃疡性结肠炎鉴别;2项以上结合指标可较好地使IBS与健康人鉴别。  相似文献   
63.
We report one patient with cardiofaciocutaneous (CFC) syndrome. He presented with clinical findings characteristic of this condition such as: cutaneous abnormalities, including ichthyosis, widespread keratosis pilaris, a peculiar craniofacial appearance with sparse, curly hair and low-set posteriorly rotated ears; congenital heart defects; and mild mental and motor retardation. We submit a comprehensive review of previously published articles regarding the dermatological findings in CFC syndrome (recently shown to be a variant of Noonan syndrome) emphasizing diagnostic criteria and its differentiation from the Costello syndrome.  相似文献   
64.
BACKGROUND: Bowel-associated dermatosis-arthritis syndrome denotes the occurrence of diarrhoea with arthritis and skin lesions related to bowel disease with or without bowel bypass. In this condition, the histological finding of cutaneous aseptic neutrophilic cell infiltrate is non-specific and common to a wide spectrum of neutrophilic dermatoses, including pyoderma gangrenosum. OBSERVATION: We describe a 78-year-old woman with fever, abdominal discomfort and arthralgias, who developed grouped pustular lesions on her shins with histologically spongiform pustule formation. Aetiological assessment disclosed diverticular disease with sigmoid stenosis. CONCLUSION: Although clinical and histological features in our case fit the diagnosis of bowel-associated dermatosis-arthritis syndrome, they may also correspond to a pustular variant of pyoderma gangrenosum. Our observation raises the question of the nosological classification of bowel-associated dermatosis-arthritis syndrome within the spectrum of neutrophilic diseases.  相似文献   
65.
Myasthenia-like syndrome induced by cardiovascular agents. Report of a case   总被引:1,自引:0,他引:1  
The case of a myasthenia-like syndrome induced by cardiovascular drugs is reported. The clinical and electrophysiological features of the case are discussed.
Sommario Viene descritto il caso di una sindrome miastenica indotta da farmaci efficaci sul sistema cardiovascolare. Vengono analizzate e discusse le principali caratteristiche cliniche ed elettrofisiologiche del caso.
  相似文献   
66.
67.
68.
越来越多的研究表明,维生素D除具有经典的调节钙磷平衡和维持骨骼健康的作用外,还具有其他更为广泛的骨外生物学效应,如调节免疫、抗肿瘤、保护中枢神经系统和防治代谢综合征等作用.本文就相关方面的研究进展进行综述.  相似文献   
69.
Since 1903, Marchiafava‐Bignami disease has been recognized as a rare syndrome with focal demyelination and necrosis in the corpus callosum, which is usually found in chronic alcoholics. It extends into the neighboring white matter and occasionally as far as the subcortical regions. We report a Japanese patient with Marchiafava‐Bignami disease associated with alcohol abuse, who had traveled around Western Europe, North America and China for more than 30 years. As he suffered extreme delirium in the early stages we administered a low dose (10 mg) of mianserin hydrochloride. He was very irritable and uncooperative on admission, after 20 days his delirium had disappeared and his temper had become very calm and mild. After 40 days, his intelligence level increased substantially as measured by various neuropsychological tests.  相似文献   
70.
Antiandrogen withdrawal syndrome (AWS) is a well-established phenomenon in prostate cancer. However, responses to AWS are usually of limited duration, and a complete response (CR) is extremely rare. We present two patients who exhibited a chemical CR for more than 2 years after the discontinuation of steroidal antiandrogen chlormadinone acetate use. Whether patients who respond to antiandrogen withdrawal include a group of patients with a better prognosis remains uncertain. However, considering that the usual survival period of patients with hormone-resistant prostate cancer is approximately 12 months, both of the patients reported here, who are present in excellent physical condition, exhibiting an improved quality of life, and attending their hospital as outpatients, obviously acquired a prolonged survival because of AWS.  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