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   1279815篇
  免费   98150篇
  国内免费   1991篇
耳鼻咽喉   18446篇
儿科学   44367篇
妇产科学   35023篇
基础医学   182372篇
口腔科学   33601篇
临床医学   111421篇
内科学   258429篇
皮肤病学   28038篇
神经病学   100445篇
特种医学   51282篇
外国民族医学   660篇
外科学   196600篇
综合类   27058篇
现状与发展   1篇
一般理论   377篇
预防医学   95805篇
眼科学   27940篇
药学   94855篇
  2篇
中国医学   2428篇
肿瘤学   70806篇
  2018年   13182篇
  2017年   9997篇
  2016年   10929篇
  2015年   12409篇
  2014年   17221篇
  2013年   26280篇
  2012年   36125篇
  2011年   38146篇
  2010年   22846篇
  2009年   21860篇
  2008年   36702篇
  2007年   39324篇
  2006年   39571篇
  2005年   38505篇
  2004年   37656篇
  2003年   36496篇
  2002年   35837篇
  2001年   64017篇
  2000年   66514篇
  1999年   56429篇
  1998年   15137篇
  1997年   13764篇
  1996年   14202篇
  1995年   13460篇
  1994年   12768篇
  1993年   11793篇
  1992年   44572篇
  1991年   43477篇
  1990年   42229篇
  1989年   40122篇
  1988年   36910篇
  1987年   36237篇
  1986年   33629篇
  1985年   32281篇
  1984年   24140篇
  1983年   20268篇
  1982年   11723篇
  1981年   10693篇
  1980年   9515篇
  1979年   21343篇
  1978年   14821篇
  1977年   12532篇
  1976年   11693篇
  1975年   12623篇
  1974年   14664篇
  1973年   14118篇
  1972年   12945篇
  1971年   11730篇
  1970年   11051篇
  1969年   10025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