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   941160篇
  免费   68452篇
  国内免费   1352篇
耳鼻咽喉   13033篇
儿科学   24864篇
妇产科学   23593篇
基础医学   134347篇
口腔科学   28333篇
临床医学   82230篇
内科学   184780篇
皮肤病学   19332篇
神经病学   73197篇
特种医学   37034篇
外国民族医学   80篇
外科学   153157篇
综合类   18198篇
现状与发展   1篇
一般理论   247篇
预防医学   63266篇
眼科学   21416篇
药学   73104篇
  3篇
中国医学   2173篇
肿瘤学   58576篇
  2018年   9298篇
  2017年   7313篇
  2016年   8057篇
  2015年   9153篇
  2014年   12386篇
  2013年   18166篇
  2012年   25060篇
  2011年   26073篇
  2010年   15391篇
  2009年   14784篇
  2008年   25504篇
  2007年   26590篇
  2006年   27338篇
  2005年   26247篇
  2004年   25294篇
  2003年   24232篇
  2002年   23795篇
  2001年   54841篇
  2000年   56624篇
  1999年   47043篇
  1998年   10841篇
  1997年   9557篇
  1996年   9668篇
  1995年   9016篇
  1994年   8337篇
  1993年   7652篇
  1992年   35531篇
  1991年   33955篇
  1990年   32774篇
  1989年   31925篇
  1988年   28995篇
  1987年   28267篇
  1986年   26293篇
  1985年   25151篇
  1984年   17833篇
  1983年   15137篇
  1982年   7786篇
  1981年   6757篇
  1979年   15764篇
  1978年   10589篇
  1977年   9033篇
  1976年   7868篇
  1975年   8620篇
  1974年   10455篇
  1973年   9851篇
  1972年   9359篇
  1971年   8848篇
  1970年   8418篇
  1969年   7918篇
  1968年   7201篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
61.
62.
63.
64.
Journal of Thrombosis and Thrombolysis - Amniotic fluid embolism (AFE) is a catastrophic condition in the peripartum period and still remains as a leading cause of maternal death. Although over 80%...  相似文献   
65.
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment.  相似文献   
66.
The retroviral protease of human immunodeficiency virus (HIV) is an excellent target for antiviral inhibitors for treating HIV/AIDS. Despite the efficacy of therapy, current efforts to control the disease are undermined by the growing threat posed by drug resistance. This review covers the historical background of studies on the structure and function of HIV protease, the subsequent development of antiviral inhibitors, and recent studies on drug-resistant protease variants. We highlight the important contributions of Dr. Stephen Oroszlan to fundamental knowledge about the function of the HIV protease and other retroviral proteases. These studies, along with those of his colleagues, laid the foundations for the design of clinical inhibitors of HIV protease. The drug-resistant protease variants also provide an excellent model for investigating the molecular mechanisms and evolution of resistance.  相似文献   
67.
68.
69.
70.
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