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   1100篇
  免费   58篇
  国内免费   7篇
耳鼻咽喉   3篇
儿科学   18篇
妇产科学   5篇
基础医学   156篇
口腔科学   39篇
临床医学   106篇
内科学   253篇
皮肤病学   18篇
神经病学   63篇
特种医学   26篇
外科学   180篇
综合类   11篇
一般理论   1篇
预防医学   70篇
眼科学   38篇
药学   67篇
中国医学   4篇
肿瘤学   107篇
  2024年   1篇
  2023年   11篇
  2022年   32篇
  2021年   51篇
  2020年   35篇
  2019年   43篇
  2018年   59篇
  2017年   29篇
  2016年   47篇
  2015年   45篇
  2014年   51篇
  2013年   73篇
  2012年   98篇
  2011年   118篇
  2010年   46篇
  2009年   53篇
  2008年   59篇
  2007年   53篇
  2006年   35篇
  2005年   50篇
  2004年   41篇
  2003年   28篇
  2002年   19篇
  2001年   4篇
  2000年   4篇
  1999年   10篇
  1998年   4篇
  1997年   3篇
  1996年   7篇
  1995年   4篇
  1994年   4篇
  1993年   2篇
  1992年   1篇
  1991年   5篇
  1990年   4篇
  1989年   4篇
  1988年   4篇
  1987年   3篇
  1986年   2篇
  1985年   1篇
  1983年   6篇
  1982年   4篇
  1981年   3篇
  1980年   3篇
  1979年   4篇
  1974年   1篇
  1929年   1篇
排序方式: 共有1165条查询结果,搜索用时 0 毫秒
1.

Background

Limited data exists demonstrating the efficacy of minimally invasive surgery (MIS) compared to median sternotomy (MS) for multiple valvular disease (MVD). This systematic review and meta-analysis aims to compare operative and peri-operative outcomes of MIS vs MS in MVD.

Methods

PubMed, Ovid, and Embase were searched from inception until August 2019 for randomized and observational studies comparing MIS and MS in patients with MVD. Clinical outcomes of intra- and postoperative times, reoperation for bleeding and surgical site infection were evaluated.

Results

Five observational studies comparing 340 MIS vs 414 MS patients were eligible for qualitative and quantitative review. The quality of evidence assessed using the Newcastle-Ottawa scale was good for all included studies. Meta-analysis demonstrated increased cardiopulmonary bypass time for MIS patients (weighted mean difference [WMD], 0.487; 95% confidence interval [CI], 0.365-0.608; P < .0001). Similarly, aortic cross-clamp time was longer in patients undergoing MIS (WMD, 0.632; 95% CI, 0.509-0.755; P < .0001). No differences were found in operative mortality, reoperation for bleeding, surgical site infection, or hospital stay.

Conclusions

MIS for MVD have similar short-term outcomes compared to MS. This adds value to the use of minimally invasive methods for multivalvular surgery, despite conferring longer operative times. However, the paucity in literature and learning curve associated with MIS warrants further evidence, ideally randomized control trials, to support these findings.
  相似文献   
2.
3.
Taban-Arshan extract decreased expression of T-lymphocyte activation markers, normalized T-cell-mediated immunity, and suppressed increased activity of natural killer receptors during culturing with lymphocytes of patients with atopic bronchial asthma. Taban-Arshan extract normalized activation processes in the B-cell immunity and stimulated expression of receptors of activation-induced apoptosis. Translated fromByulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 138, No. 7, pp. 76–78, July, 2004  相似文献   
4.
5.
Women health workers have made great contributions to the health of their community for many years. In India, women physicians have established some hospitals, e.g., Christian Medical Colleges in Ludhiana and Vellore. Some such hospitals operate in remote areas to serve the poor and the suffering. Women health workers of Jamkhed, Deen Bandhu of Pachod, have proved that village women can improve the health status of their community, particularly that of women and children, if they receive encouragement to learn health care skills In India, community health care lies mainly with women (e.g., nursing personnel and in rural areas). Yet, despite their competence and experience, few become physicians, health project directors, and administrators because the society continues to be patriarchal and discriminates against females. Women need to become empowered to ensure equal opportunities for training and promotion and equal wages for equal work. In Bangladesh, use of bicycles to visit houses allows women paramedical workers from Gonasasthya Kendra, Sawar, freedom and imparts confidence. People must identify customs, practices, laws, attitudes, religious misrepresentations, and policies that discriminate against women and then oppose them. They should set these changes in motion at home, in villages, and from district to national, and even global levels. In India, society blames the mother for having a girl, but the man donates the chromosome determining sex. In Gandhigram, a woman physician and her peers have effected an apparent change in attitude toward the birth of a girl. Now the people confer equal happiness to her birth as they do to a boy's birth. Yet, female infanticides still occur in some villages of Salem District of Tamil Nadu. Sex determination tests often lead to abortion of female fetuses. Once a woman marries she has no right to her maternal home and often suffers from domestic violence. Many people resist legislation to grant women more rights, e.g., property rights. Various media promote women's empowerment.  相似文献   
6.
The new ?Witch Craft Prevention Bill? prohibiting witch hunting was passed in Bihar, India, in reaction to the branding and subsequent killing of more than 500 helpless women as "dayans" (witches) in the past 7 years. Most of them were single, widows, or deserted women victimized by the pathological greed of some of the male members of their families or by some powerful persons in the village community interested in claiming their property. Even with the passage of the bill, though, most of these crimes will remain unpunished because the community is an accomplice in them, and they tend not to be reported. What is needed overall is socioeconomic and political development that will lead to the empowerment of women to ensure that there will be an end to the cruel and inhuman activities (such as witch hunting) instigated by traditional healers or "Ojhas".  相似文献   
7.
8.
BackgroundIn the absence of head-to-head trials, comprehensive evidence comparing onset of efficacy of novel agents for acute treatment of migraine is lacking. This study aimed to explore the relative efficacy of lasmiditan (serotonin [5-hydroxytryptamine] 1F receptor agonist) versus rimegepant and ubrogepant (calcitonin gene-related peptide antagonists) for the acute oral treatment of migraine through network meta-analysis (NMA).MethodsData included in the NMA were identified through a systematic literature search (conducted April 2018, updated May/December 2020) of phase II–IV, randomised controlled trials (RCTs) in adults with chronic/episodic migraine with/without aura. Treatments included: lasmiditan 50, 100, 200 mg; rimegepant 75 mg; ubrogepant 25, 50, 100 mg. Pairwise treatment comparisons from Bayesian fixed-effect/random-effects NMA, adjusted by baseline risk where appropriate, were conducted. Comparisons were reported as odds ratios with 95% credible intervals. Early-onset efficacy endpoints included: pain freedom at 2 hours and pain relief at 1 and 2 hours. Adverse drug reaction (ADR) profiles were summarised. Heterogeneity and inconsistency in the network were explored; sensitivity analyses investigated robustness of findings.ResultsAcross 12 RCTs included in the base case, females represented >80% of included patients (mean age 37.9–45.7 years). Odds of achieving both pain freedom and pain relief at 2 hours were higher with lasmiditan 100 and 200 mg versus rimegepant 75 mg and ubrogepant 25 and 50 mg. Results for pain relief at 1 hour were consistent with those at 2 hours, but fewer comparisons were available. There were no statistically significant differences between lasmiditan 50 mg and ubrogepant or rimegepant for any outcome. Sensitivity analyses were in the same direction as base case analyses. Most commonly reported ADRs (incidence ≥2%) were: dizziness, fatigue, paraesthesia, sedation, nausea/vomiting and muscle weakness with lasmiditan; nausea with rimegepant; and nausea, somnolence and dry mouth with ubrogepant.ConclusionsThe efficacy findings of this indirect comparison indicate that lasmiditan 100 mg or 200 mg might be an appropriate acute treatment option for patients with migraine seeking a fast onset of action. Differently from rimegepant and ubrogepant, lasmiditan use is associated with mainly neurological events, which are mostly mild or moderate in severity and self-limiting.350/350 wordsSupplementary InformationThe online version contains supplementary material available at 10.1186/s10194-022-01440-w.  相似文献   
9.
Due to the climatic change, an increase in aflatoxin B1 (AFB1) maize contamination has been reported in Europe. As an alternative to mineral binders, natural phytogenic compounds are increasingly used to counteract the negative effects of AFB1 in farm animals. In cows, even low dietary AFB1 concentrations may result in the milk excretion of the genotoxic carcinogen metabolite aflatoxin M1 (AFM1). In this study, we tested the ability of dietary turmeric powder (TP), an extract from Curcuma longa (CL) rich in curcumin and curcuminoids, in reducing AFM1 mammary excretion in Holstein–Friesian cows. Both active principles are reported to inhibit AFM1 hepatic synthesis and interact with drug transporters involved in AFB1 absorption and excretion. A crossover design was applied to two groups of cows (n = 4 each) with a 4-day washout. Animals received a diet contaminated with low AFB1 levels (5 ± 1 µg/kg) for 10 days ± TP supplementation (20 g/head/day). TP treatment had no impact on milk yield, milk composition or somatic cell count. Despite a tendency toward a lower average AFM1 milk content in the last four days of the treatment (below EU limits), no statistically significant differences with the AFB1 group occurred. Since the bioavailability of TP active principles may be a major issue, further investigations with different CL preparations are warranted.  相似文献   
10.
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