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   1281460篇
  免费   98262篇
  国内免费   2013篇
耳鼻咽喉   18441篇
儿科学   44511篇
妇产科学   35142篇
基础医学   182505篇
口腔科学   33687篇
临床医学   111502篇
内科学   258759篇
皮肤病学   28083篇
神经病学   100525篇
特种医学   51398篇
外国民族医学   660篇
外科学   196835篇
综合类   27105篇
现状与发展   1篇
一般理论   377篇
预防医学   95890篇
眼科学   28030篇
药学   94959篇
  2篇
中国医学   2448篇
肿瘤学   70875篇
  2018年   13218篇
  2017年   10034篇
  2016年   10965篇
  2015年   12450篇
  2014年   17275篇
  2013年   26328篇
  2012年   36226篇
  2011年   38267篇
  2010年   22927篇
  2009年   21939篇
  2008年   36791篇
  2007年   39400篇
  2006年   39652篇
  2005年   38598篇
  2004年   37728篇
  2003年   36545篇
  2002年   35919篇
  2001年   64071篇
  2000年   66583篇
  1999年   56480篇
  1998年   15162篇
  1997年   13773篇
  1996年   14221篇
  1995年   13477篇
  1994年   12784篇
  1993年   11804篇
  1992年   44590篇
  1991年   43488篇
  1990年   42241篇
  1989年   40135篇
  1988年   36928篇
  1987年   36273篇
  1986年   33656篇
  1985年   32301篇
  1984年   24152篇
  1983年   20282篇
  1982年   11734篇
  1981年   10696篇
  1980年   9519篇
  1979年   21354篇
  1978年   14828篇
  1977年   12539篇
  1976年   11700篇
  1975年   12628篇
  1974年   14665篇
  1973年   14123篇
  1972年   12948篇
  1971年   11735篇
  1970年   11054篇
  1969年   10026篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
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   
993.
994.
Isolated fractures of the metacarpal and phalangeal bones are common injuries of the upper extremities. They usually occur at the age of 10–40, whereas the highest incidence is observed in childhood. The results of treatment have an important impact for the practical value of the hand. This article aims to give a brief overview of the different fracture types and their treatment options.  相似文献   
995.
996.
997.
A 50-yr-old man presented with synovitis of the metacarpophalangealjoints, Raynaud's phenomenon, recurrent pericarditis and a linearpalpable rash in both axillae.  相似文献   
998.
999.
1000.
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature.  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