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   615364篇
  免费   33766篇
  国内免费   1215篇
耳鼻咽喉   7706篇
儿科学   19510篇
妇产科学   14605篇
基础医学   104189篇
口腔科学   14364篇
临床医学   55524篇
内科学   114153篇
皮肤病学   13606篇
神经病学   42053篇
特种医学   23139篇
外国民族医学   76篇
外科学   90228篇
综合类   9218篇
现状与发展   2篇
一般理论   153篇
预防医学   43603篇
眼科学   13307篇
药学   48489篇
  4篇
中国医学   1617篇
肿瘤学   34799篇
  2021年   5511篇
  2019年   5360篇
  2018年   7548篇
  2017年   5533篇
  2016年   6345篇
  2015年   7084篇
  2014年   9387篇
  2013年   13800篇
  2012年   19930篇
  2011年   21953篇
  2010年   12942篇
  2009年   11481篇
  2008年   19767篇
  2007年   21638篇
  2006年   20982篇
  2005年   20119篇
  2004年   20016篇
  2003年   19277篇
  2002年   18855篇
  2001年   25662篇
  2000年   26137篇
  1999年   21494篇
  1998年   6253篇
  1997年   5174篇
  1996年   5142篇
  1995年   4827篇
  1992年   15957篇
  1991年   17405篇
  1990年   17285篇
  1989年   16919篇
  1988年   15496篇
  1987年   15254篇
  1986年   14224篇
  1985年   13614篇
  1984年   10086篇
  1983年   8637篇
  1982年   4603篇
  1979年   9451篇
  1978年   6777篇
  1977年   5501篇
  1976年   5824篇
  1975年   7005篇
  1974年   7857篇
  1973年   7588篇
  1972年   6991篇
  1971年   6681篇
  1970年   6209篇
  1969年   5796篇
  1968年   5475篇
  1967年   4911篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
Neuroscience and Behavioral Physiology - Objective. To determine the frequency, structure, and severity of cognitive impairments in patients with bipolar affective disorder (BAD) in remission....  相似文献   
42.
43.
44.
45.

Purpose

A hydrogel rectal spacer (HRS) is a medical device that is approved by the U.S. Food and Drug Administration to increase the separation between the prostate and rectum. We conducted a cost-effectiveness analysis of HRS use for reduction in radiation therapy (RT) toxicities in patients with prostate cancer (PC) undergoing external beam RT (EBRT).

Methods and Materials

A multistate Markov model was constructed from the U.S. payer perspective to examine the cost-effectiveness of HRS in men with localized PC receiving EBRT (EBRT alone vs EBRT + HRS). The subgroups analyzed included site of HRS placement (hospital outpatient, physician office, ambulatory surgery center) and proportion of patients with good baseline erectile function (EF). Data on EF, gastrointestinal and genitourinary toxicities incidence, and potential risks associated with HRS implantation were obtained from a recently published randomized clinical trial. Health utilities and costs were derived from the literature and the 2018 Physician Fee Schedule and were discounted 3% annually. Quality-adjusted life years (QALYs) and costs were modeled for a 5-year period from receipt of RT. Probabilistic sensitivity analysis and value-based threshold analyses were conducted.

Results

The per-patient 5-year incremental cost for spacers administered in a hospital outpatient setting was $3578, and the incremental effectiveness was 0.0371 QALYs. The incremental cost-effectiveness ratio was $96,440/QALY for patients with PC undergoing HRS insertion in a hospital and $39,286/QALY for patients undergoing HRS insertion in an ambulatory facility. For men with good baseline EF, the incremental cost-effectiveness ratio was $35,548/QALY and $9627/QALY in hospital outpatient and ambulatory facility settings, respectively.

Conclusions

Based on the current Medicare Physician Fee Schedule, HRS is cost-effective at a willingness to pay threshold of $100,000. These results contain substantial uncertainty, suggesting more evidence is needed to refine future decision-making.  相似文献   
46.
47.
48.
49.
The recognition that neurogenesis does not stop with adolescence has spun off research towards the reduction of brain disorders by enhancing brain regeneration. Adult neurogenesis is one of the tougher problems of developmental biology as it requires the generation of complex intracellular and pericellular anatomies, amidst the danger of neuroinflammation. We here review how a multitude of regulatory pathways optimized for early neurogenesis has to be revamped into a new choreography of time dependencies. Distinct pathways need to be regulated, ranging from neural growth factor induced differentiation to mitochondrial bioenergetics, reactive oxygen metabolism, and apoptosis. Requiring much Gibbs energy consumption, brain depends on aerobic energy metabolism, hence on mitochondrial activity. Mitochondrial fission and fusion, movement and perhaps even mitoptosis, thereby come into play. All these network processes are interlinked and involve a plethora of molecules. We recommend a deep thinking approach to adult neurobiology.  相似文献   
50.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  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