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   958972篇
  免费   58330篇
  国内免费   1076篇
耳鼻咽喉   12618篇
儿科学   31633篇
妇产科学   25019篇
基础医学   157642篇
口腔科学   25277篇
临床医学   83768篇
内科学   176727篇
皮肤病学   22454篇
神经病学   66929篇
特种医学   35191篇
外国民族医学   116篇
外科学   142132篇
综合类   15681篇
现状与发展   2篇
一般理论   219篇
预防医学   71467篇
眼科学   22529篇
药学   74389篇
  1篇
中国医学   2015篇
肿瘤学   52569篇
  2018年   9885篇
  2016年   8250篇
  2015年   9191篇
  2014年   12419篇
  2013年   18908篇
  2012年   26673篇
  2011年   29186篇
  2010年   16990篇
  2009年   15670篇
  2008年   27418篇
  2007年   29778篇
  2006年   29585篇
  2005年   28256篇
  2004年   27592篇
  2003年   26541篇
  2002年   25834篇
  2001年   43313篇
  2000年   44763篇
  1999年   36850篇
  1998年   9963篇
  1997年   8522篇
  1996年   8833篇
  1995年   8208篇
  1994年   7508篇
  1992年   27775篇
  1991年   28980篇
  1990年   29109篇
  1989年   28276篇
  1988年   25974篇
  1987年   25733篇
  1986年   24150篇
  1985年   23124篇
  1984年   17251篇
  1983年   14692篇
  1982年   8032篇
  1981年   7342篇
  1979年   16680篇
  1978年   11999篇
  1977年   9907篇
  1976年   9959篇
  1975年   11678篇
  1974年   13494篇
  1973年   12973篇
  1972年   12204篇
  1971年   11741篇
  1970年   10928篇
  1969年   10361篇
  1968年   9780篇
  1967年   8769篇
  1966年   7826篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
913.
Two cases of internal herniation through a defect in the broad ligament of the uterus are described. Both were successfully treated laparoscopically. This rare condition should be borne in mind when a middle-aged woman presents with colicky lower abdominal pain. The cause is unknown, but both congenital and acquired origins have been proposed. As far as emergency situations are concerned, laparoscopy has proven to be both a diagnostic and a therapeutic tool.  相似文献   
914.
Objective Changes in serum albumin may reflect systemic immunoinflammation and hypermetabolism in response to insults such as trauma and sepsis. Esophagectomy is associated with a major metabolic stress, and the aim of this study was to determine if the absolute albumin level on the first postoperative day was of value in predicting in-hospital complications. Methods A retrospective study of 200 patients undergoing esophagectomy for malignant disease at St. James Hospital between 1999 and 2005 was performed. Patients who had pre and postoperative (days 1, 3, and 7) serum albumin levels measured were included in the study. Patients were subdivided into three postoperative albumin categories <20 g/l, 20–25 g/l, >25 g/l. Logistic regression analysis was performed to calculate the odds of morbidity and mortality according to the day 1 albumin level. Results Patients with an albumin of less than 20 g/l on the first postoperative day were twice as likely to develop postoperative complications than those with an albumin of greater than 20 g/l (54 vs 28% respectively, p < 0.011). Correspondingly, these patients also had a significantly higher rate of Adult Respiratory Distress Syndrome (22 vs 5%, p < 0.001), respiratory failure (27 vs 8%, p < 0.01) and in-hospital mortality (27 vs 6% (p < 0.001). On multivariate logistic regression analysis, day 1 albumin level was independently related to postoperative complications (odds ratios, 0.89: 95%; confidence intervals, 0.83–0.96; p < 0.005). In addition, albumin <20 g/l on the first postoperative day was associated with the need for further surgery and a return to ICU. Conclusion Serum albumin concentration on the first postoperative day is a better predictor of surgical outcome than many other preoperative risk factors. It is a low cost test that may be used as a prognostic tool to detect the risk of adverse surgical outcomes.  相似文献   
915.
Endotracheal intubation is required in 5–10% of all prehospital emergencies. Poor environmental conditions (e.g. limited space, poor or excessive lighting etc.), unfavorable patient-related factors (e.g. trauma, bleeding, pulmonary aspiration etc.) and the pressure of time make prehospital airway management a challenging procedure even for experienced emergency physicians. The incidence of difficult endotracheal intubation is significantly higher than in-hospital. Profound clinical practice, recognition and adequate treatment of complications of intubation, and ongoing clinical practice are essential for successful and responsible prehospital airway management. A brief physical examination helps to identify predictors for difficult intubation, thereby modifying treatment strategies. Every emergency physician must be closely familiar with at least one supraglottic airway device and the recent algorithms to manage the unanticipated difficult airway.  相似文献   
916.
AIM: To assess the efficacy of intravesical botulinum toxin type A (BTX-A) in interstitial cystitis (IC). METHODS: Eleven patients with IC were injected with BTX-A. Primary outcome measures were: Bristol Female Lower Urinary Tract Symptom Score, Kings Health Questionnaire and 24-hour frequency-volume chart. They had urodynamics done before and six weeks after injection. Detrusor contractility was assessed using the modified PIP1 (projected isovolumetric detrusor pressure).  相似文献   
917.
918.
919.
Cerebellar involvement in motor and non-motor sequence learning was examined with serial reaction time tasks (SRT). Our sample consisted of 8 children and adolescents who had undergone surgical removal of a benign posterior fossa tumor (PFT) during childhood. None of them had undergone chemotherapy or cranial radiation therapy (CRT). Ages ranged from 1-11 years at surgery and 9-17 years at testing. The children were tested not earlier than 2.5 years after surgery (M = 5.9 years), enabling brain plasticity and recovery of functions. Their performance was compared with a matched control sample. The PFT group was not impaired in the implicit learning of sequences, as reflected in their performance in blocks with a repeated sequence, both before and after a random block. However, in the perceptual task, their performance deteriorated more than that of the control group when a random block was introduced, suggesting that it was more difficult for the patients to respond flexibly or change their response set when encountering changing task demands. These results are in line with another study by our group on task switching with the same patients.  相似文献   
920.
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