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   964篇
  免费   119篇
  国内免费   23篇
耳鼻咽喉   4篇
儿科学   85篇
妇产科学   19篇
基础医学   138篇
口腔科学   79篇
临床医学   61篇
内科学   199篇
皮肤病学   26篇
神经病学   31篇
特种医学   11篇
外科学   29篇
综合类   92篇
预防医学   189篇
眼科学   1篇
药学   103篇
中国医学   20篇
肿瘤学   19篇
  2024年   2篇
  2023年   24篇
  2022年   36篇
  2021年   88篇
  2020年   83篇
  2019年   41篇
  2018年   37篇
  2017年   71篇
  2016年   57篇
  2015年   58篇
  2014年   65篇
  2013年   156篇
  2012年   56篇
  2011年   53篇
  2010年   59篇
  2009年   32篇
  2008年   38篇
  2007年   36篇
  2006年   36篇
  2005年   16篇
  2004年   13篇
  2003年   14篇
  2002年   18篇
  2001年   8篇
  2000年   6篇
  1999年   1篇
  1998年   1篇
  1982年   1篇
排序方式: 共有1106条查询结果,搜索用时 15 毫秒
1.
Network meta-analyses (NMAs) simultaneously estimate the effects of multiple possible treatment options for a given clinical presentation. For allergists to benefit optimally from NMAs, they must understand the process and be able to interpret the results. Through a worked example published in Pediatric Allergy and Immunology, we summarize how to identify credible NMAs and interpret them with a focus on recent innovations in the GRADE approach (Grading of Recommendations Assessment, Development, and Evaluation). NMAs build on traditional systematic reviews and meta-analyses that consider only direct paired comparisons by including indirect evidence, thus allowing the simultaneous assessment of the relative effect of all pairs of competing alternatives. Our framework informs clinicians of how to identify credible NMAs and address the certainty of the evidence. Trustworthy NMAs fill a critical gap in providing key inferences using direct and indirect evidence to inform clinical decision making when faced with more than two competing courses of treatment options. This document will help allergists to identify trustworthy NMAs to enhance patient care.  相似文献   
2.
3.
Background:Gastrointestinal complications and malnutrition are common problems that affect postoperative rehabilitation and survival of patients with esophageal cancer. Evidence has shown that probiotics have a positive effect on improving gastrointestinal complications and nutritional status of patients with esophageal cancer after surgery, but there is a lack of prospective studies on this topic. We designed this prospective randomized controlled trial to evaluate the effects of probiotics on gastrointestinal complications and nutritional status in patients with postoperative esophageal cancer.Methods:This is a prospective, randomized, double-blind, placebo-controlled trial. It was approved by the Clinical Research Ethics Committee of our hospital. 192 patients will be randomly divided into probiotics group and the placebo group in a 1:1 ratio. After operation, probiotics and placebo will be given orally for 8 weeks. The indexes of nutritional status and incidence of digestive tract complications will be recorded and the data will be analyzed by SPSS 18.0 software.Discussion:This study will evaluate the effect of probiotics on gastrointestinal complications and nutritional status of postoperative patients with esophageal cancer. The results of this study will provide clinical basis for the use of probiotics in postoperative treatment of esophageal cancer.Trial registration:OSF Registration number: D DOI 10.17605/OSF.IO/QHW86  相似文献   
4.
目的 分析在重症监护病房(ICU)机械通气患者中应用益生菌联合早期肠内营养治疗对感染、胃肠功能障碍的影响。方法 采用前瞻性队列研究方法,选取2016年2月—2017年10月入住某院ICU行机械通气的患者,采用随机数字法分为A、B、C三组。A组行早期肠内营养联合益生菌治疗,B组行早期肠内营养治疗,C组行早期肠外营养治疗。比较三组患者感染情况、感染指标水平(治疗后第3天、第7天、第14天)、胃肠功能障碍发生情况、治疗后第14天急性生理功能和慢性健康状况评分系统Ⅱ(APACHE Ⅱ)评分值。结果 A组患者感染发生率为6.00%,B组为20.00%,C组为22.00%,三组患者感染发生率比较,差异有统计学意义(χ2=8.57,P=0.01)。第7天、第14天A组患者的C反应蛋白(CRP)、白细胞计数(WBC)均低于B、C组;第3天A、B组患者的降钙素原(PCT)均较C组低;第7天、第14天A组患者的PCT较B、C组低;差异均有统计学意义(均P<0.05)。A组患者腹胀(8.00%)、腹泻(4.00%)、胃潴留(4.00%)的发生率均为三组最低。治疗后第14天A组患者的APACHE Ⅱ评分最低。结论 早期肠内营养联合益生菌治疗ICU机械通气患者能有效降低感染及胃肠功能障碍发生率,促进康复,值得推广、应用。  相似文献   
5.
The objective of this study is to investigate the immune-enhancing ability of viable and heat-killed Weissella cibaria JW15 (JW15) isolated from Kimchi in RAW 264.7 macrophages. The immune effects were evaluated by measuring the production of NO, cytokines, inflammatory enzyme, and activation of NF-κB. Viable JW15 executed higher activity on stimulating the release of TNF-α as well as activating NF-κB compared to that of heat-killed JW15. Additionally, viable and heat-killed JW15 significantly increased the production of NO, IL-6 and TNF-α more than that of Lactobacillus rhamnosus GG (LGG). Furthermore, viable JW15 induced higher production of iNOS compared with that of viable LGG. Collectively, our finding indicates that viable JW15 had similar, if not more, immune-enhancing activities as heat-killed JW15. In addition, viable JW15 had higher immune-enhancing activity than commercial strain LGG. Therefore, viable JW15 has the potential to be used as a functional food to improve the host immune response.  相似文献   
6.
ABSTRACT

A growing number of studies support that the bidirectional interactions between the gut microbiota, the immune system and the CNS are relevant for the pathophysiology of MS. Several studies have reported alterations in the gut microbiome of MS patients. In addition, a variety of studies in animal models of MS have suggested that specific members of the gut commensal microbiota can exacerbate or ameliorate neuroinflammation. Probiotics represent oral nontoxic immunomodulatory agents that would exert benefits when using in combination with current MS therapy. Here we investigate the effect of Vivomixx on the gut microbiome and central and peripheral immune responses in a murine model of primary progressive MS. Vivomixx administration was associated with increased abundance of many taxa such as Bacteroidetes, Actinobacteria, Tenericutes and TM7. This was accompanied by a clear improvement of the motor disability of Theiler’s virus infected mice; in the CNS Vivomixx reduced microgliosis, astrogliosis and leukocyte infiltration. Notably, the presence of Breg cells (CD19+CD5+CD1dhigh) in the CNS was enhanced by Vivomixx, and while spinal cord gene expression of IL-1β and IL-6 was diminished, the probiotic promoted IL-10 gene expression. One of the most significant findings was the increased plasma levels of butyrate and acetate levels in TMEV-mice that received Vivomixx. Peripheral immunological changes were subtle but interestingly, the probiotic restricted IL-17 production by Th17-polarized CD4+ T-cells purified from the mesenteric lymph nodes of Theiler’s virus infected mice. Our data reinforce the beneficial effects of oral probiotics that would be coadjuvant treatments to current MS therapies.  相似文献   
7.
一直以来,人们将肠道菌群称为一个“被遗忘的多细胞器官”。随着现代医学研究的不断发展,肠道菌群与骨质疏松症之间的相关性已经成为近年骨科领域的研究热点,加之广泛的临床和基础研究结果,已经证实肠道菌群的稳态对调控人体健康至关重要,其紊乱会引起及加重包括骨质疏松为代表的多种慢性疾患。笔者对近年来骨质疏松与肠道菌群相关研究文献进行综述,并重点探讨通过调节紊乱的肠道菌群,从而治疗骨质疏松的相关作用机制,以期为临床预防及治疗骨质疏松提供新思路。  相似文献   
8.
9.
10.
ABSTRACT

Clostridioides difficile infection (CDI) is a common cause of antimicrobial-associated diarrhea. Probiotics have shown variable results in decreasing its incidence and severity. We examined the efficacy of Lactobacillus reuteri administered using a novel probiotic biofilm delivery system in the treatment and prevention of CDI in a murine model.

For prophylactic therapy, mice received an oral antibiotic cocktail followed by clindamycin injection, followed by probiotic administration (planktonic vs. biofilm state), followed by C. difficile oral gavage. For treatment therapy, mice received antibiotics and C. difficile first, followed by probiotic administration. Clinical sickness scores (CSS) and intestinal histologic injury scores (HIS) were assigned.  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