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   3546147篇
  免费   247900篇
  国内免费   10441篇
耳鼻咽喉   50151篇
儿科学   113582篇
妇产科学   99985篇
基础医学   498908篇
口腔科学   99738篇
临床医学   319746篇
内科学   691202篇
皮肤病学   84941篇
神经病学   288498篇
特种医学   138317篇
外国民族医学   1122篇
外科学   531324篇
综合类   74152篇
现状与发展   16篇
一般理论   1365篇
预防医学   264052篇
眼科学   82224篇
药学   262843篇
  12篇
中国医学   8467篇
肿瘤学   193843篇
  2021年   28465篇
  2018年   39416篇
  2017年   30427篇
  2016年   35545篇
  2015年   40872篇
  2014年   55696篇
  2013年   82314篇
  2012年   109825篇
  2011年   115429篇
  2010年   69577篇
  2009年   65923篇
  2008年   106469篇
  2007年   113361篇
  2006年   114112篇
  2005年   109791篇
  2004年   105475篇
  2003年   101560篇
  2002年   97835篇
  2001年   162220篇
  2000年   166150篇
  1999年   140621篇
  1998年   40925篇
  1997年   36378篇
  1996年   35980篇
  1995年   34694篇
  1994年   31957篇
  1993年   29922篇
  1992年   109629篇
  1991年   105889篇
  1990年   102864篇
  1989年   99730篇
  1988年   92014篇
  1987年   90222篇
  1986年   85239篇
  1985年   81451篇
  1984年   61061篇
  1983年   51890篇
  1982年   31115篇
  1979年   55495篇
  1978年   39468篇
  1977年   34060篇
  1976年   31227篇
  1975年   34177篇
  1974年   40288篇
  1973年   38692篇
  1972年   36544篇
  1971年   34074篇
  1970年   31786篇
  1969年   30641篇
  1968年   28429篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
A 37-year-old male with history of alcohol abuse presented to us with nausea, vomiting, and abdominal pain with ascites. He was diagnosed with alcoholic liver disease with coagulopathy and pancreatitis. During hospitalization, the patient developed intra-abdominal hemorrhage. He was treated with platelets, packed red blood cells and fresh frozen plasma without any improvement. Following this he was treated with activated recombinant factor VII (90 microg/kg), which resulted in normalization of the prothrombin time and the activated partial thromboplastin time and stabilization of hematocrit within a few hours. We review the current literature on the approved and off-label use of activated recombinant factor VII.  相似文献   
992.
993.
994.
995.
Extubation difficulties after long-term endotracheal intubation in neonates and infants require immediate re-intubation with a somewhat thinner endotracheal tube, continuation of long-term intubation for another 7–14 days with antibiotic and antiphlogistic therapy including antireflux treatment as well as a subtile endoscopic examination. A tracheostomy is not indicated before several attempts of extubation have failed. An anterior cricoid split should be indicated with great care and in premature neonates only. In manifest cicatrical stenoses, subtile endoscopic diagnostics are an essential prerequisite for the choice of surgical method and time of surgery. In rather mild stenoses (grade II), laryngotracheal reconstruction (LTR) with anterior wall cartilage grafting is presently regarded as method of choice. For subglottic stenoses of higher degrees (grade III and IV), partial cricotracheal resection (PCTR) is felt to be the most successful procedure. For all scarred stenoses involving the glottic level, LTR with posterior and anterior wall cartilage grafting appears to be the only suitable treatment. LTR with anterior wall grafting only as well as the PCTR can be performed as a single stage procedure with postoperative long-term intubation on an intensive care unit for one or more days. LTR with posterior and anterior wall grafting requires long-term stenting for several weeks or months depending upon the individual condition. For long-term stenting, our so-called double-tube-technique using a modified Montgomery T silicon tube together with a perforated tracheal cannula has proved to be the safest and least irksome technique.  相似文献   
996.
997.
998.
999.
BACKGROUND: Although many histopathologic factors in squamous cell carcinoma of the tongue predict the prognosis, the major predictive factors have not been identified clearly. This study analyzed the prognostic value of the histologic grade at the deep invasive front of tongue squamous cell carcinoma. METHODS: The clinicopathologic features of 124 consecutive patients seen between January 1985 and December 1999 with previously untreated squamous cell carcinoma of the tongue were reviewed. Their mean age was 58.5 years (range: 23-90) and the male-female ratio was 1.8: 1 (79 men and 45 women). There were 41, 40, 30, and 13 cases at stage I to stage IV, respectively. The clinicopathologic factors, especially the histologic grade at the deep invasive front (invasive front grade, IFG), were analyzed to determine factors predicting prognosis. RESULTS: The 5-year disease-free survival rate of the patients treated with curative aim only was 66.7%. Clinicopathologic factors significantly associated with the prognosis were T classification, tumor size, stage classification, tumor depth, macroscopic appearance, cervical lymph node metastasis (nodal metastasis), microvascular invasion, and IFG. In a multivariate analysis, patients with tumor depth >/=4 mm, IFG >/=8 points, and nodal metastasis had a reduced disease-free survival and IFG >/=11 points had a predictive value for nodal metastasis (odds ratio: 7.34; P = 0.0019). CONCLUSION: This study found that a high IFG malignancy score had a high prognostic value for squamous cell carcinoma of the tongue.  相似文献   
1000.
A new approach to the activation of reactants during the condensation of aromatic aldehydes with N-aroylglycines (acting as CH-acids) is described. The condensation reaction carried out on heating in phosphorus oxychloride leads to a high yield of 4-benzylideneoxazol-5-one derivatives. The hydrolysis of these intermediate products yields the target α-benzoylaminocinnamic acids. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 7, pp. 41 – 42, July, 2005.  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