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   731621篇
  免费   43179篇
  国内免费   1202篇
耳鼻咽喉   8915篇
儿科学   22229篇
妇产科学   16701篇
基础医学   118698篇
口腔科学   16734篇
临床医学   67924篇
内科学   138161篇
皮肤病学   14567篇
神经病学   53749篇
特种医学   26391篇
外国民族医学   66篇
外科学   109612篇
综合类   10922篇
现状与发展   4篇
一般理论   394篇
预防医学   57160篇
眼科学   16084篇
药学   55333篇
  2篇
中国医学   1498篇
肿瘤学   40858篇
  2021年   7155篇
  2019年   7112篇
  2018年   9499篇
  2017年   7195篇
  2016年   8130篇
  2015年   9252篇
  2014年   12954篇
  2013年   18989篇
  2012年   28091篇
  2011年   31120篇
  2010年   17758篇
  2009年   15850篇
  2008年   28785篇
  2007年   31282篇
  2006年   30285篇
  2005年   30095篇
  2004年   29233篇
  2003年   27783篇
  2002年   26835篇
  2001年   24250篇
  2000年   24396篇
  1999年   20916篇
  1998年   7962篇
  1997年   6734篇
  1996年   6528篇
  1995年   6019篇
  1994年   5384篇
  1992年   15587篇
  1991年   16930篇
  1990年   16968篇
  1989年   16547篇
  1988年   15281篇
  1987年   15182篇
  1986年   14129篇
  1985年   13736篇
  1984年   10829篇
  1983年   9419篇
  1982年   5944篇
  1981年   5413篇
  1979年   9723篇
  1978年   7315篇
  1977年   6056篇
  1976年   6317篇
  1975年   7273篇
  1974年   8075篇
  1973年   7735篇
  1972年   7017篇
  1971年   6649篇
  1970年   6213篇
  1969年   5703篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
BackgroundNeoadjuvant yttrium-90 transarterial radioembolization (TARE) is increasingly being used as a strategy to facilitate resection of otherwise unresectable tumors due to its ability to generate both tumor response and remnant liver hypertrophy. Perioperative outcomes after the use of neoadjuvant lobar TARE remain underinvestigated.MethodsA single center retrospective review of patients who underwent lobar TARE prior to major hepatectomy for primary or metastatic liver cancer between 2007 and 2018 was conducted. Baseline demographics, radioembolization parameters, pre- and post-radioembolization volumetrics, intra-operative surgical data, adverse events, and post-operative outcomes were analyzed.ResultsTwenty-six patients underwent major hepatectomy after neoadjuvant lobar TARE. The mean age was 58.3 years (17–88 years). 62% of patients (n=16) had primary liver malignancies while the remainder had metastatic disease. Liver resection included right hepatectomy or trisegmentectomy, left or extended left hepatectomy, and sectorectomy/segmentectomy in 77% (n=20), 8% (n=2), and 15% (n=4) of patients, respectively. The mean length of stay was 8.3 days (range, 3–33 days) and there were no grade IV morbidities or 90-day mortalities. The incidence of post hepatectomy liver failure (PHLF) was 3.8% (n=1). The median time to progression after resection was 4.5 months (range, 3.3–10 months). Twenty-three percent (n=6) of patients had no recurrence. The median survival was 28.9 months (range, 16.9–46.8 months) from major hepatectomy and 37.6 months (range, 25.2–53.1 months) from TARE.ConclusionsMajor hepatectomy after neoadjuvant lobar radioembolization is safe with a low incidence of PHLF.  相似文献   
94.
95.
96.
97.
98.
99.

Objective

Hypertonic saline (HTS) has potent immune and vascular effects. We assessed recipient pretreatment with HTS on allograft function in a porcine model of heart transplantation and hypothesized that HTS infusion would limit endothelial and left ventricular (LV) dysfunction following transplantation.

Methods

Heart transplants were performed after 6 hours of cold ischemic storage. Recipient pigs were randomized to treatment with or without HTS (7.5% NaCl) before cardiopulmonary bypass (CPB). Using a myograft apparatus, coronary artery endothelial-dependent (Edep) and -independent (Eind) relaxation was assessed. LV performance was determined using pressure-volume loop analysis. Pulmonary interleukin (IL)-2, IL-6, and tumor necrosis factor (TNF)-α expression was measured.

Results

Weaning from CPB and LV performance after transplantation were improved in HTS-treated animals. Successful weaning from CPB was greater in the HTS-treated hearts (8 of 8 vs 2 of 8; P < .05). Mean LV functional recovery was improved in the HTS-treated animals, as assessed by preload recruitable stroke work (65 ± 10% vs 27 ± 10%; P < .001) and end-systolic elastance (55 ± 7% vs 37 ± 4%; P < .001). Treatment with HTS resulted in improved Edep (mean maximum elastance [Emax], 56 ± 5% vs 37 ± 7%; P < .001) and Eind (mean Emax%, 77 ± 6% vs 52 ± 4%; P < .001) vasorelaxation compared with control. Pulmonary expression of IL-2, IL-6, and TNF-α increased following transplantation, whereas HTS therapy attenuated IL production (P < .001). Transplantation increased plasma TNF-α levels and LV TNF-α expression, whereas HTS prevented this up-regulation (P < .001).

Conclusions

Recipient HTS pretreatment preserves allograft vasomotor and LV function, and HTS therapy limits CPB-induced injury. HTS may be a novel recipient intervention to prevent graft dysfunction.  相似文献   
100.
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