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   113452篇
  免费   11442篇
  国内免费   8779篇
耳鼻咽喉   981篇
儿科学   1078篇
妇产科学   1149篇
基础医学   13767篇
口腔科学   1944篇
临床医学   14991篇
内科学   16296篇
皮肤病学   1200篇
神经病学   6068篇
特种医学   4480篇
外国民族医学   78篇
外科学   11626篇
综合类   20558篇
现状与发展   40篇
一般理论   6篇
预防医学   7551篇
眼科学   3308篇
药学   11983篇
  91篇
中国医学   7054篇
肿瘤学   9424篇
  2024年   159篇
  2023年   1758篇
  2022年   2779篇
  2021年   5487篇
  2020年   4706篇
  2019年   3998篇
  2018年   4163篇
  2017年   3703篇
  2016年   3549篇
  2015年   5420篇
  2014年   6639篇
  2013年   5842篇
  2012年   8513篇
  2011年   9402篇
  2010年   5920篇
  2009年   4676篇
  2008年   6048篇
  2007年   5984篇
  2006年   5796篇
  2005年   5862篇
  2004年   3809篇
  2003年   3489篇
  2002年   2987篇
  2001年   2651篇
  2000年   2794篇
  1999年   2976篇
  1998年   1978篇
  1997年   2001篇
  1996年   1544篇
  1995年   1484篇
  1994年   1288篇
  1993年   808篇
  1992年   990篇
  1991年   796篇
  1990年   671篇
  1989年   647篇
  1988年   542篇
  1987年   474篇
  1986年   415篇
  1985年   317篇
  1984年   158篇
  1983年   129篇
  1982年   80篇
  1981年   91篇
  1980年   62篇
  1979年   57篇
  1978年   11篇
  1977年   6篇
  1976年   7篇
  1975年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
目的:总结主动脉窦瘤破裂的手术适应症、手术方法和预后。方法:回顾性分析2011年1月至2017年12月因主动脉窦瘤破裂于我院行外科手术治疗的130名患者资料。其中男性58例(44.62%),女性72例(55.38%),年龄32~75(52.72±13.87)岁。合并室间隔缺损55例(42.31%),合并主动脉瓣关闭不全39例(30%),合并房间隔缺损12例(9.23%),合并三尖瓣关闭不全8例(6.15%),合并二尖瓣关闭不全6例(4.62%),合并主动脉夹层1例(0.77%),合并其他心脏疾病9例(6.92%);破裂开口起源于右冠窦119例,起源于无冠窦11例。所有患者均在中低温体外循环下行手术治疗。结果:所有患者中,2例患者围术期死亡,余128例患者随访5个月至5年,术后心功能恢复至I-II级。结论:一旦发现主动脉窦瘤破裂,应积极予以治疗。  相似文献   
82.
Background and aimSilver has been widely used as a topical antimicrobial agent in burn wound care. In a previous study, we demonstrated the introduction of nano-silver particles to porcine small intestinal submucosa (NS-PSIS) led to significant enhancement in antibacterial property in repairing contaminated abdominal defect. In this study, we explored the efficacy of NS-PSIS in the treatment of Pseudomonas aeruginosa-infected partial-thickness burn wounds.Methods48 male Sprague-Dawley rats were divided into four groups of equal number. Standardized and reproducible Pseudomonas aeruginosa-infected partial-thickness thermal burns wound model were created using these rats. NS-PSIS, PSIS (porcine small intestinal submucosa) or lipido-colloid dressingss (Urgotul?) were tested for 14 days to assess their ability to heal the rats’ burn wounds. Control group was without any treatment after the establishment of infected burn-wound. The wound contraction rate, animal body weight change, histological examination, and the quantification of IL-6 and C-reactive protein (CRP) were measured to evaluate the healing effects.ResultsNS-PSIS significantly promoted wound healing and recovered the normal growth of rats. There were significantly lower expression levels of pro-inflammatory cytokine (IL-6) and CRP in NS-PSIS group as compared with the PSIS or Urgotul group in the treatment of infected partial-thickness burn wounds. Histological exams revealed significant less inflammatory cells infiltrating, more re-epithelization and neovascularization in NS-PSIS group. There were also less inflammatory cells infiltrations in the major organs in NS-PSIS group.ConclusionsNano-silver modified porcine small intestinal submucosa (NS-PSIS) can be used as a biological derivative dressing for the treatment of infected partial-thickness burn wounds.  相似文献   
83.
84.
85.
BackgroundThe relationship between body mass index (BMI) and in-hospital mortality risk among patients with acute myocardial infarction (AMI) remains controversial.Methods and ResultsWe included 35,964 patients diagnosed with AMI in China Acute Myocardial Infarction registry between January 2013 and December 2016. Patients were categorized into 4 groups according to BMI level: BMI <18.5, 18.5–24.9, 25–30, and ≥30 kg/m2 for underweight, normal, overweight, and obese groups, respectively. Clinical data were extracted for each patient, and multivariable logistic regression analysis was used to examine the association between BMI level and in-hospital mortality. Compared with normal-weight patients, obese patients were younger, more often current smokers, and more likely to have hypertension, hyperlipidemia, and diabetes. Multivariable regression analysis results demonstrated that compared with normal group, underweight group had significantly higher in-hospital mortality (odds ratio [OR]: 1.34; 95% confidence interval [CI]: 1.06–1.69; p = 0.016), while overweight group (OR: 0.86; 95% CI: 0.77–0.97; p = 0.011) and obese group (OR: 0.65; 95% CI: 0.46–0.91; p = 0.013) had lower mortality. All subgroups showed a trend toward lower in-hospital mortality risk as BMI increased.ConclusionsOur study provided robust evidence supporting “obesity paradox” in a contemporary large-scale cohort of patients with AMI and demonstrated that increased BMI was independently associated with lower in-hospital mortality.  相似文献   
86.
87.
The purpose of this study was to compare acoustic structure quantification (ASQ) with transient elastography for staging liver fibrosis. One hundred eighty-two patients with chronic hepatitis B and without moderate to severe hepatic steatosis scheduled for liver biopsy underwent ASQ and transient elastography examinations. All ASQ parameters, including total mode, total average, red mode, red average, red standard deviation, blue mode, blue average, blue standard deviation and focal disturbance (FD) ratio and liver stiffness obtained via transient elastography were found to correlate with fibrosis stage (Spearman's r?=?0.783, 0.791, 0.750, 0.771, 0.544, 0.718, 0.691, 0.439, 0.815 and 0.814, respectively; all p values < 0.001). Among the ASQ parameters, the FD ratio had the highest correlation with the stage of fibrosis. The areas under the receiver operating characteristic curves (AUCs) of FD ratio and liver stiffness were 0.911 and 0.906 for F ≥ F1, 0.918 and 0.882 for F ≥ F2, 0.911 and 0.914 for F ≥ F3 and 0.926 and 0.978 for F?=?F4, respectively. There was no significant difference in AUCs between FD ratio and liver stiffness in predicting different stages of fibrosis (p?=?0.062–0.912). ASQ is a promising technique for assessing liver fibrosis in the absence of moderate to severe hepatic steatosis.  相似文献   
88.
International Urology and Nephrology - Autosomal dominant polycystic kidney disease (ADPKD) is considered as a tumor-like disease because there are many biological similarities between ADPKD and...  相似文献   
89.
目的比较胸腰椎骨折患者接受经椎旁肌间隙入路与微创经皮入路手术治疗的效果及关节功能。方法回顾性分析2014年4月-2015年10月在该院接受内固定手术治疗的胸腰椎骨折患者,根据手术入路不同分为椎旁入路组和经皮微创组,分别接受经椎旁肌间隙入路与微创经皮入路手术治疗。比较两组患者的手术情况、围手术期血清创伤分子含量以及远期功能恢复情况和矫正畸形效果。结果椎旁入路组的手术时间明显短于经皮微创组,差异有统计学意义(P0.05);术中出血量、术后引流量、术后卧床时间、住院总时间与经皮微创组比较,差异均无统计学意义(P0.05);两组患者术后当天的血清肌酸激酶(CK)、肌红蛋白(Myo)和乳酸脱氢酶(LDH)含量比较,差异均无统计学意义(P0.05),术后3、6和12个月时的伤椎前后缘高度比、Cobb角、视觉模拟评分(VAS)比较,差异均无统计学意义(P0.05)。结论椎旁肌间隙入路与微创经皮入路手术治疗胸腰椎骨折的效果和创伤程度相当,椎旁肌间隙入路的手术操作更为简单、手术时间更短。  相似文献   
90.
目的分析某电子制造企业员工职业紧张状况及影响因素,探讨职业紧张干预策略。方法采用整群抽样方法,以某电子制造企业的826名员工为研究对象,采用《简明职业紧张问卷》调查其工作要求-自主(JDC)模式职业紧张,采用自行设计的调查表调查工作压力来源、减压方式、服务需求等情况。结果 826名研究对象中,职业紧张检出率为80.3%。多因素Logistic回归分析显示,轮班作业者发生职业紧张的风险高于非轮班人员(P0.01),接触职业病危害因素作业人员发生职业紧张的风险高于非接触者(P0.05)。工作单调、升职机会渺茫和工作负荷是调查对象工作压力的主要来源。研究对象对健康生活方式、个人职业发展计划、人际沟通技巧、压力与情绪管理以及医疗保健服务的需求较高;愿意接受的服务方式以面对面咨询和培训优先;喜欢的活动方式以拓展活动和休闲办公竞技优先。结论电子制造企业员工职业紧张检出率较高,轮班和接触职业病危害为其主要影响因素。建议从组织层面和个体层面同时采取措施,缓解职业紧张的不良影响,推进企业健康良性发展。  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