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   1284857篇
  免费   94756篇
  国内免费   2027篇
耳鼻咽喉   18243篇
儿科学   42390篇
妇产科学   38014篇
基础医学   188159篇
口腔科学   35628篇
临床医学   108703篇
内科学   253759篇
皮肤病学   26655篇
神经病学   99839篇
特种医学   50449篇
外国民族医学   366篇
外科学   199539篇
综合类   26534篇
现状与发展   1篇
一般理论   300篇
预防医学   92708篇
眼科学   29146篇
药学   98583篇
  1篇
中国医学   2516篇
肿瘤学   70107篇
  2018年   11956篇
  2016年   10236篇
  2015年   11785篇
  2014年   16225篇
  2013年   24651篇
  2012年   33966篇
  2011年   36441篇
  2010年   21476篇
  2009年   20257篇
  2008年   35441篇
  2007年   38409篇
  2006年   38943篇
  2005年   38204篇
  2004年   36902篇
  2003年   35855篇
  2002年   35395篇
  2001年   58514篇
  2000年   60006篇
  1999年   51102篇
  1998年   14370篇
  1997年   12918篇
  1996年   13176篇
  1995年   12442篇
  1994年   11835篇
  1993年   10914篇
  1992年   41227篇
  1991年   40552篇
  1990年   40106篇
  1989年   38962篇
  1988年   36351篇
  1987年   35585篇
  1986年   33926篇
  1985年   32342篇
  1984年   24037篇
  1983年   20928篇
  1982年   12421篇
  1981年   10961篇
  1979年   22733篇
  1978年   15940篇
  1977年   13772篇
  1976年   12994篇
  1975年   14236篇
  1974年   16721篇
  1973年   16114篇
  1972年   15366篇
  1971年   14277篇
  1970年   13261篇
  1969年   12786篇
  1968年   12012篇
  1967年   10498篇
排序方式: 共有10000条查询结果,搜索用时 656 毫秒
71.
72.
73.
74.
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   
75.
76.
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them.  相似文献   
77.
78.
79.
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   
80.
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