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   1424614篇
  免费   101694篇
  国内免费   3290篇
耳鼻咽喉   20720篇
儿科学   42542篇
妇产科学   40246篇
基础医学   198331篇
口腔科学   41558篇
临床医学   122272篇
内科学   280231篇
皮肤病学   31408篇
神经病学   115327篇
特种医学   57183篇
外国民族医学   438篇
外科学   222897篇
综合类   32008篇
现状与发展   6篇
一般理论   562篇
预防医学   99801篇
眼科学   33263篇
药学   106061篇
  4篇
中国医学   3086篇
肿瘤学   81654篇
  2018年   13997篇
  2016年   12363篇
  2015年   13923篇
  2014年   19777篇
  2013年   29495篇
  2012年   39776篇
  2011年   42033篇
  2010年   24840篇
  2009年   23928篇
  2008年   40002篇
  2007年   43319篇
  2006年   43710篇
  2005年   42103篇
  2004年   41103篇
  2003年   39425篇
  2002年   38689篇
  2001年   64408篇
  2000年   65870篇
  1999年   56198篇
  1998年   15743篇
  1997年   14301篇
  1996年   13612篇
  1995年   12848篇
  1994年   12012篇
  1992年   43202篇
  1991年   41674篇
  1990年   40894篇
  1989年   39838篇
  1988年   37256篇
  1987年   36696篇
  1986年   35155篇
  1985年   33391篇
  1984年   25116篇
  1983年   21283篇
  1982年   12961篇
  1981年   11820篇
  1979年   24027篇
  1978年   17194篇
  1977年   14936篇
  1976年   13472篇
  1975年   15337篇
  1974年   18143篇
  1973年   17629篇
  1972年   16859篇
  1971年   15751篇
  1970年   14951篇
  1969年   14384篇
  1968年   13493篇
  1967年   12038篇
  1966年   11275篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
82.
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children.  相似文献   
83.
84.
85.
86.
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   
87.
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