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   1239423篇
  免费   80977篇
  国内免费   2827篇
耳鼻咽喉   15059篇
儿科学   42691篇
妇产科学   32633篇
基础医学   172339篇
口腔科学   30495篇
临床医学   108576篇
内科学   237758篇
皮肤病学   24596篇
神经病学   101757篇
特种医学   49482篇
外国民族医学   305篇
外科学   190712篇
综合类   26984篇
一般理论   452篇
预防医学   100148篇
眼科学   26507篇
药学   85354篇
  5篇
中国医学   2698篇
肿瘤学   74676篇
  2019年   8373篇
  2018年   34439篇
  2017年   27256篇
  2016年   31512篇
  2015年   12772篇
  2014年   16938篇
  2013年   25187篇
  2012年   39656篇
  2011年   56573篇
  2010年   39630篇
  2009年   31535篇
  2008年   53449篇
  2007年   58755篇
  2006年   35271篇
  2005年   36214篇
  2004年   36824篇
  2003年   37258篇
  2002年   33822篇
  2001年   47749篇
  2000年   49112篇
  1999年   41016篇
  1998年   12098篇
  1997年   10965篇
  1996年   10798篇
  1995年   10421篇
  1994年   9664篇
  1993年   8964篇
  1992年   32633篇
  1991年   31846篇
  1990年   31375篇
  1989年   30160篇
  1988年   27491篇
  1987年   27614篇
  1986年   25691篇
  1985年   24891篇
  1984年   18669篇
  1983年   15794篇
  1982年   9692篇
  1981年   8648篇
  1979年   17046篇
  1978年   12410篇
  1977年   10433篇
  1976年   9885篇
  1975年   10235篇
  1974年   12410篇
  1973年   11897篇
  1972年   10909篇
  1971年   10134篇
  1970年   9425篇
  1969年   8788篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
81.
82.
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   
83.
84.
We report a case of intestinal obstruction in a 73-year-old woman caused by ileocolic intussusception. The underlying cause was a giant submucosal ulcerating lipoma (6?×?3.3?×?3.8 cm) extending from the superior mucosal lip of Bauhin’s valve. Abdominal ultrasonography showed a pathognomonic target-like mass appearing as multiple concentric rings. CT scan confirmed the diagnosis. Because of apparent obstruction, a laparotomy with right hemicolectomy and ileocolic anastomosis was performed. Lipomas most frequently occur in the cecum and ascending colon where they represent the most common submucosal mesenchymal tumor. They typically occur in elderly women with an incidence that varies from 0.15 to 0.56 %. Pain, rectal bleeding, and obstruction are typical symptoms. When faced with an intussusception in children, reduction with air per rectum can be performed. In adults, however, malignant cell spreading and seeding is of big concern. Since approximately 20–50 % of all underlying causes are malignant, explorative surgery is favored in adults.  相似文献   
85.
86.
87.
Advancing nanomedicines from concept to clinic requires integration of new science with traditional pharmaceutical development. The medical and commercial success of nanomedicines is greatly facilitated when those charged with developing nanomedicines are cognizant of the unique opportunities and technical challenges that these products present. These individuals must also be knowledgeable about the processes of clinical and product development, including regulatory considerations, to maximize the odds for successful product registration. This article outlines these topics with a goal to accelerate the combination of academic innovation with collaborative industrial scientists who understand pharmaceutical development and regulatory approval requirements—only together can they realize the full potential of nanomedicines for patients.  相似文献   
88.
89.
90.
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