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   1263898篇
  免费   94822篇
  国内免费   1578篇
耳鼻咽喉   16317篇
儿科学   40999篇
妇产科学   34947篇
基础医学   189391篇
口腔科学   34733篇
临床医学   117764篇
内科学   247818篇
皮肤病学   27278篇
神经病学   101857篇
特种医学   46761篇
外国民族医学   265篇
外科学   178604篇
综合类   25749篇
现状与发展   3篇
一般理论   568篇
预防医学   104655篇
眼科学   28044篇
药学   92557篇
  7篇
中国医学   2022篇
肿瘤学   69959篇
  2018年   13533篇
  2017年   10392篇
  2016年   11326篇
  2015年   13079篇
  2014年   18000篇
  2013年   27479篇
  2012年   37578篇
  2011年   39972篇
  2010年   23058篇
  2009年   22254篇
  2008年   37755篇
  2007年   40381篇
  2006年   39967篇
  2005年   39099篇
  2004年   37549篇
  2003年   35957篇
  2002年   34866篇
  2001年   56033篇
  2000年   57047篇
  1999年   48101篇
  1998年   13399篇
  1997年   12226篇
  1996年   12644篇
  1995年   11915篇
  1994年   11107篇
  1993年   10399篇
  1992年   38201篇
  1991年   37674篇
  1990年   36450篇
  1989年   35260篇
  1988年   32691篇
  1987年   32028篇
  1986年   30525篇
  1985年   28786篇
  1984年   21942篇
  1983年   19194篇
  1982年   11365篇
  1981年   10321篇
  1979年   20944篇
  1978年   15395篇
  1977年   12791篇
  1976年   11845篇
  1975年   12810篇
  1974年   15588篇
  1973年   15362篇
  1972年   14512篇
  1971年   13552篇
  1970年   12786篇
  1969年   12065篇
  1968年   11229篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Studies of former prisoners of war (POWs) provide valuable insights into posttraumatic adaptation because they gather information from a large population who survived the traumatic experiences of military captivity. Previous studies of POWs have shown elevated rates of psychiatric symptoms and disorders. This report presents evidence from a longitudinal study of three large, representative, national samples of former POWs. The study finds that depressive symptomatology, as measured by the Center for Epidemiologic Studies Depression Scale, is elevated in World War II POWs from the Pacific and European theaters and in Korean conflict POWs. Decades later, depressive symptomatology is found to be strongly associated with prior treatment in captivity. Differences in depressive symptomatology among the three POW groups can be attributed to captivity-related factors and to buffering factors, such as age at capture and education.  相似文献   
992.
The study was undertaken to examine the effect of nimodipine, calcium channels blocker, on the morphological alterations induced by quinolinic acid (QUIN). The experiment was performed on 21-day-old organotypic rat hippocampal cultures. Nimodipine was applied to the nutrient medium simultaneously with QUIN (both at 100 microM). Ultrastructural changes were evaluated 24 h, 5 and 7 days after the exposure to tested agent. It was shown that nimodipine induced distinct cytoprotective effect, especially considering the development of late neurotoxic injury produced by QUIN. However, the protection was not complete, indicating the participation of the other factors in the pathomechanism underlying structural damage produced by QUIN.  相似文献   
993.
The study of urinary sediment is essential in laboratory diagnosis. Conventional clinical methods are now used in line with computer-aided techniques and additional microscopy of the sediment elements. The paper provides a brief analysis of clinical situations characterized by appearance in the urine of abnormal numbers of leukocytes, erythrocytes, casts; provides clinical assessment of additional microscopic methods able to accentuate qualitative characteristics of the urinary syndrome; considers possibilities of application of the urinary sediment data in follow-up to improve diagnosis and control on-going treatment.  相似文献   
994.
995.
The clinical, biochemical and pathological features of 31 patients with thyroid carcinoma managed at Hospital Universiti Sains Málaysia, Kubang Kerian from 1985 to 1989 were analyzed. There were 25 females and 6 males. The types of carcinoma were: papillary-17 cases; follicular-10 cases; medullary-2 cases and anaplastic-2 cases. For papillary carcinoma the mean age of the patients was 52.9 years. For follicular carcinoma the mean age was 48.3 years, for medullary carcinoma, 48.5 years and for anaplastic, 74.5 years. All patients had pre-existing goitre except for 2 and most presented with advanced disease. The mean duration of symptoms for papillary carcinoma was 3.7 years, follicular carcinoma 1.6 years, medullary carcinoma 13.5 years and anaplastic carcinoma 6 months. 12 patients presented with goitre of increasing size; 9 had compression symptoms; 4 presented with cervical lymph node enlargement and 6 presented with bony pains of whom 2 had paraplegia. None of the patients were ever thyrotoxic or hypothyroid. Treatment in general was unsatisfactory because of patients' non-acceptance of surgery and/or radioactive iodine.  相似文献   
996.
The question of whether somatic complaints are a significant feature of depression independent of anxiety was explored. Structured interview (Kiddie Schedule for Affective Disorders and Schizophrenia for School-Age Children) and Child Behavior Checklist data from depressed and nondepressed psychiatric controls were analyzed to explore the interaction of somatic complaints, anxiety, and depression. Seventy percent of the children who met criteria for depression also had significant somatic complaints in contrast to 34% of the controls. Findings revealed that frequency of somatic complaints increased with severity of depression regardless of coexisting anxiety.  相似文献   
997.
998.
999.
1000.
As many as 136 patients (76 with Bechterew's disease, 40 with Reiter's disease and 20 with psoriatic arthritic) and 35 practically healthy persons were examined by echocardiography combined with electro-, phonocardiographic and by clinical, x-ray and laboratory methods. 62 patients were examined over time (within a period from 1 to 4 years). Echocardiography was used to study in detail the central and intracardiac hemodynamics, the status of the valvular apparatus of the heart and of the aorta. The different clinical characteristics of the disease were established to make a concrete contribution to the development of cardial pathology. The disease duration is the most significant characteristics. A long-term prospective follow-up coupled with echocardiographic examinations made over time enabled one to specify the structure of heart damage in patients suffering from Bechterew's disease, Reiter's disease and psoriatic arthritis depending on the hypothetic nature of the damage.  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