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   2370383篇
  免费   198188篇
  国内免费   4202篇
耳鼻咽喉   34262篇
儿科学   72729篇
妇产科学   62940篇
基础医学   334803篇
口腔科学   67519篇
临床医学   215389篇
内科学   468144篇
皮肤病学   47928篇
神经病学   200724篇
特种医学   95949篇
外国民族医学   886篇
外科学   360340篇
综合类   56209篇
现状与发展   1篇
一般理论   977篇
预防医学   190393篇
眼科学   55437篇
药学   177519篇
  4篇
中国医学   4365篇
肿瘤学   126255篇
  2018年   24201篇
  2016年   20577篇
  2015年   23281篇
  2014年   33544篇
  2013年   50839篇
  2012年   68753篇
  2011年   72288篇
  2010年   42475篇
  2009年   40869篇
  2008年   68774篇
  2007年   73106篇
  2006年   73997篇
  2005年   72040篇
  2004年   69335篇
  2003年   67015篇
  2002年   66260篇
  2001年   112449篇
  2000年   116534篇
  1999年   98341篇
  1998年   27862篇
  1997年   25524篇
  1996年   25453篇
  1995年   24613篇
  1994年   23162篇
  1993年   21556篇
  1992年   79395篇
  1991年   76394篇
  1990年   73578篇
  1989年   70846篇
  1988年   65853篇
  1987年   64805篇
  1986年   61339篇
  1985年   58404篇
  1984年   44226篇
  1983年   37659篇
  1982年   22888篇
  1981年   20332篇
  1980年   19035篇
  1979年   41303篇
  1978年   28987篇
  1977年   24349篇
  1976年   22834篇
  1975年   23966篇
  1974年   29641篇
  1973年   28049篇
  1972年   26229篇
  1971年   24152篇
  1970年   22752篇
  1969年   21089篇
  1968年   19136篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
141.
142.
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   
143.
144.
145.
146.
147.
148.
Clinical Oral Investigations - The aims of this study are to assess different saliva substitutes for their efficacy to lubricate the oral cavity, and to relate this oral lubrication to the ability...  相似文献   
149.
150.
Background: Dense deposit disease and atypical hemolytic uremic syndrome are often caused by Complement Factor H (CFH) mutations. This study describes the retinal abnormalities in dense deposit disease and, for the first time, atypical haemolytic uremic syndrome. It also reviews our understanding of drusen pathogenesis and their relevance for glomerular disease. Methods: Six individuals with dense deposit disease and one with atypical haemolytic uremic syndrome were studied from 2 to 40 years after presentation. Five had renal transplants. All four who had genetic testing had CFH mutations. Individuals underwent ophthalmological review and retinal photography, and in some cases, optical coherence tomography, and further tests of retinal function. Results: All subjects with dense deposit disease had impaired night vision and retinal drusen or whitish-yellow deposits. Retinal atrophy, pigmentation, and hemorrhage were common. In late disease, peripheral vision was restricted, central vision was distorted, and there were scotoma from sub-retinal choroidal neovascular membranes and atypical serous retinopathy. Drusen were present but less prominent in the young person with atypical uremic syndrome due to a heterozygous CFH mutation. Conclusions: Drusen are common in forms of C3 glomerulopathy caused by compound heterozygous or heterozygous CFH mutations. They are useful diagnostically but also impair vision. Drusen have an identical composition to glomerular deposits. They are also identical to the drusen of age-related macular degeneration, and may respond to the same treatments. Individuals with a C3 glomerulopathy should be assessed ophthalmologically at diagnosis, and monitored regularly for vision-threatening complications.  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