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   81610篇
  免费   9597篇
  国内免费   399篇
耳鼻咽喉   696篇
儿科学   1991篇
妇产科学   3131篇
基础医学   7973篇
口腔科学   1662篇
临床医学   21372篇
内科学   16389篇
皮肤病学   864篇
神经病学   5582篇
特种医学   2092篇
外国民族医学   2篇
外科学   10699篇
综合类   1045篇
现状与发展   1篇
一般理论   103篇
预防医学   6865篇
眼科学   1868篇
药学   4481篇
中国医学   140篇
肿瘤学   4650篇
  2023年   1026篇
  2022年   465篇
  2021年   1373篇
  2020年   1321篇
  2019年   1201篇
  2018年   2302篇
  2017年   2164篇
  2016年   2353篇
  2015年   2583篇
  2014年   3255篇
  2013年   4520篇
  2012年   4179篇
  2011年   4776篇
  2010年   3368篇
  2009年   3493篇
  2008年   4635篇
  2007年   4718篇
  2006年   4553篇
  2005年   4548篇
  2004年   4241篇
  2003年   3801篇
  2002年   3712篇
  2001年   1194篇
  2000年   893篇
  1999年   1135篇
  1998年   1311篇
  1997年   1293篇
  1996年   1124篇
  1995年   1049篇
  1994年   871篇
  1993年   762篇
  1992年   779篇
  1991年   743篇
  1990年   650篇
  1989年   617篇
  1988年   532篇
  1987年   502篇
  1986年   478篇
  1985年   560篇
  1984年   533篇
  1983年   490篇
  1982年   609篇
  1981年   531篇
  1980年   535篇
  1979年   376篇
  1978年   378篇
  1977年   385篇
  1976年   326篇
  1975年   324篇
  1974年   276篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
101.
102.
PURPOSE: To evaluate the role of adjuvant interferon alfa after complete resection of locally extensive renal cell carcinoma. PATIENTS AND METHODS: A total of 283 eligible patients with pT3-4a and/or node-positive disease were randomly assigned after radical nephrectomy and lymphadenectomy to observation or to interferon alfa-NL (Wellferon, Burroughs-Wellcome, Research Park, NC) given daily for 5 days every 3 weeks for up to 12 cycles. Patients were stratified on the basis of pathologic stage. Patients remained on treatment until documented recurrence, excessive toxicity, or patient/physician preference deemed removal appropriate. RESULTS: At median follow-up of 10.4 years, median survival was 7.4 years in the observation arm and 5.1 year in the treatment arm (log-rank P =.09). Median recurrence-free survival was 3.0 years in the observation arm and 2.2 years in the interferon arm (P =.33). Performance status (P =.003), nodal status (N2 v N0, P <.0001), and tumor stage (P =.0002) were significant prognostic factors in multivariate analysis. A proportional hazards model examining the effects of treatment arm and time to recurrence on survival after recurrence among patients who recurred found that random assignment to interferon treatment (P =.009) and shorter time to recurrence (P <.0001) were independent predictors of shorter survival after recurrence. Although no lethal toxicities were observed, severe (grade 4) toxicities including neutropenia, myalgia, fatigue, depression, and other neurologic toxicities occurred in 11.4% of those randomly assigned to interferon treatment. CONCLUSION: Adjuvant treatment with interferon did not contribute to survival or relapse-free survival in this group of patients.  相似文献   
103.
104.
105.
106.
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   
107.
108.
109.
This is a case study of a patient with recurrent synovial chondromatosis. It shows some relevant images. It also provides possibilities for why this patient may have had a recurrence and how this was managed.  相似文献   
110.
Cardiovascular risk increases with each decrement in renal function. Low-density lipoprotein (LDL) cholesterol levels are not associated with increased mortality, but high-density lipoprotein (HDL) levels are inversely associated with cardiovascular risk. Lipoprotein composition with increased abundance of small dense LDL and HDL and reduced levels of more buoyant isoforms is similar to what is found in states of insulin resistance and in the metabolic syndrome (MS). In both cases, high triglyceride levels are associated with reduced HDL levels. Chronic kidney disease (CKD) is itself associated with increasing insulin resistance as renal function fails. In both instances, decreased levels of apo A-I and apo A-II are a consequence of increased fractional catabolic rate (FCR), resulting from a predominance of small HDL particles. HDL maturation is impaired in CKD through decreased activity of lecithin:cholesterol acyltransferase (LCAT), and increased cholesterol ester transfer protein (CETP) activity in MS shuttles triglycerides back into HDL, thereby destabilizing it. Whether insulin resistance is entirely responsible for disorders of HDL metabolism in CKD, or whether the process is a result of unrelated pathophysiology, is currently unknown.  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