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   1094篇
  免费   58篇
  国内免费   7篇
耳鼻咽喉   10篇
儿科学   18篇
妇产科学   7篇
基础医学   93篇
口腔科学   68篇
临床医学   73篇
内科学   186篇
皮肤病学   5篇
神经病学   75篇
特种医学   317篇
外国民族医学   1篇
外科学   83篇
综合类   13篇
预防医学   95篇
眼科学   8篇
药学   38篇
肿瘤学   69篇
  2021年   17篇
  2019年   13篇
  2018年   13篇
  2016年   16篇
  2015年   13篇
  2014年   28篇
  2013年   44篇
  2012年   31篇
  2011年   41篇
  2010年   25篇
  2009年   20篇
  2008年   33篇
  2007年   38篇
  2006年   27篇
  2005年   24篇
  2004年   25篇
  2003年   10篇
  2002年   13篇
  2001年   10篇
  2000年   15篇
  1999年   17篇
  1998年   21篇
  1997年   25篇
  1996年   19篇
  1995年   18篇
  1994年   26篇
  1993年   17篇
  1992年   12篇
  1991年   16篇
  1990年   17篇
  1989年   40篇
  1988年   31篇
  1987年   34篇
  1986年   28篇
  1985年   43篇
  1984年   36篇
  1983年   24篇
  1982年   16篇
  1981年   28篇
  1980年   18篇
  1979年   15篇
  1978年   25篇
  1977年   17篇
  1976年   13篇
  1975年   10篇
  1974年   14篇
  1971年   10篇
  1968年   10篇
  1967年   10篇
  1966年   9篇
排序方式: 共有1159条查询结果,搜索用时 15 毫秒
61.
OBJECTIVE: To investigate the association between mental disorders and cigarette use and nicotine dependence among pregnant women in the United States. METHODS: A face-to-face general population survey was conducted on participants in the 2001-2002 National Epidemiologic Survey on Alcohol and Related Conditions. One thousand five hundred sixteen women reporting a pregnancy in the past year were captured. Primary outcomes were seven Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition-defined mood and anxiety disorders and eight personality disorders, which were measured with the Alcohol Use Disorder and Associated Disabilities Interview Schedule. RESULTS: Among pregnant women, 21.7% reported cigarette use and 12.4% met the criteria for nicotine dependence. Among pregnant women with cigarette use, 45.1% met criteria for at least one mental disorder, and among those with nicotine dependence, 57.5% met criteria for at least one other mental disorder. After adjusting for demographics and comorbidity, nicotine dependence during pregnancy significantly predicted any mental disorder (odds ratio [OR] 3.3, 95% confidence interval [CI] 2.1-5.1), any mood disorder (OR 2.5, 95% CI 1.5-4.0), major depression (OR 2.07, 95% CI 1.3-3.4), dysthymia (OR 6.2, 95% CI 2.9-13.1), and panic disorder (OR 3.1, 95% CI 1.6-6.1) in the past year. No significant associations were found between nondependent cigarette use and mental disorders. CONCLUSION: Our results suggest an association between mental disorders and nicotine dependence among pregnant women in the United States. This association has far-reaching implications for both the mental and physical health of women and potentially for their children. LEVEL OF EVIDENCE: III.  相似文献   
62.
Pulmonary lymphangitic spread of carcinoma: appearance on CT scans   总被引:6,自引:0,他引:6  
Stein  MG; Mayo  J; Muller  N; Aberle  DR; Webb  WR; Gamsu  G 《Radiology》1987,162(2):371-375
Chest computed tomography (CT), including high-resolution CT with thin (1.5-mm) sections was used to evaluate proved (pathologically or clinically) lymphangitic spread (LS) of tumor in 12 patients. These appearances were compared with thin-section scans obtained in 11 healthy subjects. Thin-section CT demonstrated findings consistent with thickening of the normal lung interstitium. In all patients, thin sections showed an increase in the number of peripheral lines (1-2 cm in length) that were diffuse in generalized disease and localized in focal disease. Normal peripheral arcades were not increased in number, but the limbs forming the arcades were thickened in all patients. A diffuse increase in linear and curvilinear structures (reticular pattern) was seen toward the center of the lung. Polygonal structures 1-2 cm in diameter were seen in seven patients with LS but not in healthy subjects. Fissures were thickened in nine patients. Selected 1.5-mm-thick CT sections are recommended through abnormal areas (seen at CT or on chest radiographs) or if these are normal at three levels (midapex, hilus, and 3 cm above the diaphragm) when scanning patients with tumors known to cause LS.  相似文献   
63.
SQUAMOUS CELL CARCINOMA OF THE LOWER RECTUM AND ANUS   总被引:2,自引:1,他引:1  
Keyes EL 《Annals of surgery》1937,106(6):1046-1058
  相似文献   
64.
Primary malignant tumours of the extremities are rarely seen in chiropractic clinics. A case is presented of an eighty year old male who had complained of pain in the right shoulder of several days duration. History and clinical examination were consistent with mechanical joint pain. Following an appropriate course of conservative care the patient continued to improve until a re-injury occurred 3 months later. At that time, radiographs revealed an ill-defined moth-eaten lesion in the proximal humeral head. Subsequent evaluation demonstrated it to be a rare histologic sub-type of lymphoma. This case highlights several important issues ranging from clinical presentation to case management.  相似文献   
65.
Percutaneous nephrostolithotomy, which can require a double puncture, is presently the method of choice in our institution for the removal of renal stones. Patients that underwent this procedure were evaluated to identify the possible reasons for the double puncture. Of 200 patients evaluated, 14 needed a second tract. The three variables that determined whether a second puncture was needed, in order of importance, were number and size of the stones, with second tracts needed in patients with multiple stones and staghorn calculi; anatomical variations of the renal collecting system itself, with bifid systems the most significant anatomic variation; and the dexterity of the radiologist in performing the puncture and the ability of the urologist to extract the stone. Second tracts were needed more frequently in patients who presented with stones in both the lower and middle poles of the collecting systems.  相似文献   
66.
Experience with the Amplatz retrievable vena caval filter. Work in progress   总被引:1,自引:0,他引:1  
The Amplatz retrievable vena caval filter was designed in an attempt to decrease complications associated with the placement of Mobin-Uddin or Kimray-Greenfield filters. The design allows percutaneous retrieval, thus expanding application of the filter to situations requiring temporary prophylaxis against pulmonary embolism. Filters have been placed in 16 patients, nine (56%) for prophylactic purposes. All filters were easily inserted percutaneously. Complications occurred in three patients; these included complete thrombosis of the inferior vena cava below the filter, misplacement of one filter into the pericaval retroperitoneal tissue, and development of thrombus cranial to the filter. With the current introduction system, the possibility of filter misplacement has been essentially eliminated. No patient experienced symptoms suggestive of pulmonary embolism after filter insertion. One filter retrieval has been performed, with no complications.  相似文献   
67.
The role of MR imaging in evaluating metastatic spinal disease   总被引:2,自引:0,他引:2  
Fifty-eight patients with suspected epidural metastases were evaluated with MR imaging. Six patients were examined on two separate occasions. MR was judged to be diagnostic in 60 of the 64 examinations. Twenty-two patients also underwent myelography. MR was as diagnostic as myelography in all cases of epidural metastases. In addition, MR offered several advantages over myelography in the evaluation of metastatic spinal disease, including demonstration of paravertebral tumor extension, identification of additional osseous metastatic lesions, and visualization of areas of spinal cord compression occurring between areas of myelographic blocks. We conclude that MR imaging is the examination of choice for evaluating suspected metastatic spinal disease.  相似文献   
68.
69.
70.
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