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   3372891篇
  免费   240390篇
  国内免费   8432篇
耳鼻咽喉   45432篇
儿科学   110951篇
妇产科学   94133篇
基础医学   479465篇
口腔科学   93848篇
临床医学   310915篇
内科学   658569篇
皮肤病学   78962篇
神经病学   276076篇
特种医学   128745篇
外国民族医学   964篇
外科学   496088篇
综合类   69066篇
现状与发展   7篇
一般理论   1447篇
预防医学   266052篇
眼科学   75949篇
药学   246094篇
  13篇
中国医学   6467篇
肿瘤学   182470篇
  2019年   26443篇
  2018年   36791篇
  2017年   28352篇
  2016年   32430篇
  2015年   36839篇
  2014年   50737篇
  2013年   76931篇
  2012年   102366篇
  2011年   108578篇
  2010年   65006篇
  2009年   62502篇
  2008年   101954篇
  2007年   108457篇
  2006年   109685篇
  2005年   105790篇
  2004年   101822篇
  2003年   98134篇
  2002年   94852篇
  2001年   156318篇
  2000年   159986篇
  1999年   135127篇
  1998年   39178篇
  1997年   34978篇
  1996年   35431篇
  1995年   34085篇
  1994年   31424篇
  1993年   29481篇
  1992年   106254篇
  1991年   103132篇
  1990年   99926篇
  1989年   96454篇
  1988年   88955篇
  1987年   87175篇
  1986年   82183篇
  1985年   78325篇
  1984年   58912篇
  1983年   50259篇
  1982年   29980篇
  1981年   26946篇
  1979年   53040篇
  1978年   37970篇
  1977年   32217篇
  1976年   29798篇
  1975年   31916篇
  1974年   38026篇
  1973年   36674篇
  1972年   34520篇
  1971年   32096篇
  1970年   29868篇
  1969年   28510篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
Severe tuberculosis (TB) requiring intensive care unit (ICU) care is rare but commonly known to be of markedly bad prognosis. The present study aimed to describe this condition and to determine the mortality rate and risk factors associated with mortality. Patients with confirmed TB admitted to ICU between 1990 and 2001 were retrospectively identified and enrolled. Clinical, radiological and bacteriological data at admission and during hospital stay were recorded. A multivariate analysis was performed to identify the predictive factors for mortality. A total of 58 TB patients (12 females, mean age 48 yrs) admitted to ICU were included. Mean Acute Physiology and Chronic Health Evaluation (APACHE) II score at admission was 13.1+/-5.6 and 22 of 58 (37.9%) patients required mechanical ventilation. The in-hospital mortality was 15 of 58 (25.9%); 13 (22.4%) patients died in the ICU. The mean survival of patients who died was 53.6 days (range 1-229), with 50% of the patients dying within the first 32 days. The factors independently associated with mortality were: acute renal failure, need for mechanical ventilation, chronic pancreatitis, sepsis, acute respiratory distress syndrome, and nosocomial pneumonia. These data indicate a high mortality of patients with tuberculosis requiring intensive care unit care and identifies new independently associated risk factors.  相似文献   
82.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
83.
84.
    
Ohne Zusammenfassung  相似文献   
85.
Pulmonary hamartomas are usually an incidental finding and range in size from 1 cm to 8 cm in diameter in various series. We report a case of a massive pulmonary hamartoma (size 25.5 × 17.5 × 6.5 cm and weighing 1134 g) in a 61 year old male who presented with a short history of breathlessness. The tumour was arising from the medial border of the right lung and occupying most of the right chest extending in to the anterior mediastinum. The tumour was compressing the right lung and there was no evidence of infiltration into the surrounding structures. It was successfully treated by surgical resection and final histology was pulmonary hamartoma with predominantly adipose and leiomyomatous differentiation.  相似文献   
86.
87.
88.
A 27-year-old man was admitted with high fever and shivers eleven days after returning from vacation in Indonesia. Physical examination, laboratory values, abdominal ultrasound, and chest x-ray were not conclusive. All blood cultures yielded growth of Salmonella enterica serovar Typhi, and typhoid fever was diagnosed. Subsequently, the patient developed septic shock and pulmonary edema.In this case report epidemiological, clinical, and therapeutic aspects of typhoid fever are discussed with special emphasis on criteria for severe typhoid fever, which is treated with additional glucocorticoids.  相似文献   
89.
90.
OBJECTIVE: Spinal reflexes from hand to wrist muscles were investigated in writer's cramp. METHODS: Stimulus-triggered rectified EMG averages after ulnar nerve and cutaneous stimulation, in wrist flexors and extensors during tonic contraction, were compared in 18 controls and 19 patients. RESULTS: On the patient dystonic side, ulnar-induced EMG suppression was decreased in wrist extensors, and facilitation in wrist flexors modified dependent on the dystonic wrist posture during writing. No change was found on the patient non-dystonic side. Cutaneous stimulation increased wrist flexor EMG on both sides of the patients with normal wrist posture during writing, but had no effect in controls and patients with abnormal wrist posture. CONCLUSIONS: Comparison between cutaneous and mixed nerve stimuli suggests that spindle afferents from intrinsic hand muscles may mediate patients' ulnar-induced EMG modulations. Abnormal proprioceptive control was only observed on dystonic side, while bilateral unusual cutaneous control was found in patients. Changes in spinal transmission were partly related to the dystonic wrist posture, suggesting that systems involved in sensory processing can be differentially altered in writer's cramp. SIGNIFICANCE: Changes in spinal transmission, probably related to peripheral and/or cortical inputs, might either take part in primary or adaptive mechanisms underlying writer's cramp.  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