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   51831篇
  免费   4566篇
  国内免费   1810篇
耳鼻咽喉   462篇
儿科学   860篇
妇产科学   484篇
基础医学   7938篇
口腔科学   3154篇
临床医学   5611篇
内科学   5052篇
皮肤病学   6157篇
神经病学   1981篇
特种医学   2133篇
外国民族医学   11篇
外科学   7423篇
综合类   6279篇
现状与发展   10篇
预防医学   1554篇
眼科学   636篇
药学   3827篇
  20篇
中国医学   1669篇
肿瘤学   2946篇
  2023年   939篇
  2022年   878篇
  2021年   1618篇
  2020年   1999篇
  2019年   1844篇
  2018年   1814篇
  2017年   1724篇
  2016年   1831篇
  2015年   1826篇
  2014年   3125篇
  2013年   4481篇
  2012年   2720篇
  2011年   3176篇
  2010年   2482篇
  2009年   2510篇
  2008年   2567篇
  2007年   2682篇
  2006年   2383篇
  2005年   2181篇
  2004年   1906篇
  2003年   1696篇
  2002年   1340篇
  2001年   1232篇
  2000年   872篇
  1999年   871篇
  1998年   648篇
  1997年   636篇
  1996年   568篇
  1995年   565篇
  1994年   484篇
  1993年   390篇
  1992年   425篇
  1991年   374篇
  1990年   330篇
  1989年   310篇
  1988年   297篇
  1987年   277篇
  1986年   242篇
  1985年   284篇
  1984年   232篇
  1983年   169篇
  1982年   202篇
  1981年   208篇
  1980年   182篇
  1979年   142篇
  1978年   96篇
  1977年   82篇
  1976年   108篇
  1975年   51篇
  1972年   41篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
《Indian heart journal》2022,74(1):34-39
BackgroundShort term outcomes of patients with pulmonary hypertension are not available from low and middle-income countries including India.MethodsWe conducted a prospective study of 2003 patients with pulmonary hypertension, from 50 centres (PROKERALA) in Kerala, who were followed up for one year. Pulmonary hypertension (PH) was mainly diagnosed on the basis of Doppler echocardiography. The primary outcome was a composite end-point of all-cause death and hospital admission for heart failure. All cause hospitalisation events constituted the secondary outcome.ResultsMean age of study population was 56 ± 16 years. Group 1 and Group 2 PH categories constituted 21.2% and 59% of the study population, respectively. Nearly two-thirds (65%) of the study participants had functional class II symptoms. 31% of Group 1 PH patients were on specific vasodilator drugs.In total, 83 patients (4.1%) died during the one-year follow-up period. Further, 1235 re-hospitalisation events (61.7%) were reported. In the multivariate model, baseline NYHA class III/IV (OR 1.87, 95% C.I. 1.35–2.56), use of calcium channel blockers (OR 0.18, 95% C.I. 0.04–0.77), vasodilator therapy (OR 0.5, 95% C.I. 0.28–0.87) and antiplatelet agents (OR 1.80, 95% C.I. 1.29–2.51) were associated with primary composite outcome at one-year (p < 0.05).ConclusionIn the PROKERALA registry, annual mortality rate was 4%. More than half of the patients reported re-hospitalisation events on follow up. Uptake of guideline directed therapies were suboptimal in the study population. Quality improvement programmes to improve guideline directed therapy may improve clinical outcomes of PH patients in India.  相似文献   
54.
55.
ObjectiveTo analyze the effects of electrolysis, through a medium frequency current, associated to aerobic physical activity in the body composition of young women.MethodsThe study was composed of 34 sedentary women (24.35 ± 4.43 years, 71.30 ± 7.08 kg, 1.61 ± 0.06 m, 27.31 ± 1.67 kg/m2) which were evaluated for their anthropometric measures and body composition. The volunteers were randomly assigned to two group: Electrolyphysis plus Aerobic Exercise (gEEA): 17 volunteers were submitted to the application, for 60 min , of the Aussie current, followed by aerobic physical activity (77% of HRmax) on the trampoline for 40 min, through video-lessons of Jump; and Aerobic Exercise group (gEA): 17 volunteers performed only physical activity following the same parameters mentioned above. Each group performed its protocols twice weekly, for 5 weeks, totaling 10 sessions. For the data analysis, measures repeated ANOVA was performed to compare the means of the variables analyzed before and after the treatment protocols using the SPSS - 21.0 software, adopting a p ≤ 0.05.ResultsAlthough gEEA decreased suprailiac skinfold (p = 0.04), abdominal skinfold (p = 0.03) and circumference at umbilical scar (p = 0.02) in an intragroup analysis, these means differences in anthropometric measures were not important between-groups (p > 0.05). Furthermore, there were no effect of treatment on body composition (p > 0.05).ConclusionTo this studied condition, our results suggested that application of medium frequency electrolysis did not enhance the losses on anthropometric measures and body composition.  相似文献   
56.
ObjectivesTo determine which training methods positively influenced healthcare professionals’ communication skills and families’ deceased organ donation decision-making.MethodsAn integrative review using systematic methods and narrative synthesis for data analysis. Electronic databases of PubMed, Cumulative Index to Nursing and Allied Health Literature (EBSCO), Embase (OVID) and ProQuest Dissertations & Theses Global, were searched between August 1997 and March 2020, retrieving 1019 papers. Included papers (n = 14) were appraised using the Medical Education Research Study Quality Instrument.ResultsTraining programmes offered theory, experiential learning, feedback and debriefing including self-reflection, the opportunity to role-play and interact with simulated participants within realistic case scenarios. Programmes reported observed and self-rated improvements in communication learning and confidence. The methodological quality score averaged 13, (72% of maximum); few studies used an experimental design, examined behavioural change or families’ perspectives. Weak evidence suggested training could increase organ donation authorisation/consent rates.ConclusionsMultiple training strategies are effective in improving interprofessional healthcare professionals’ confidence and learning of specialised communication. Methodological limitations restricted the ability to present definitive recommendations and further research is warranted, inclusive of family decision-making experiences.Practice implicationsLearning of specialised communication skills is enhanced by using multiple training strategies, including role-play and debriefing.  相似文献   
57.
Skin is the largest organ of the body with important protective functions, which become compromised with time due to both intrinsic and extrinsic ageing processes. Cellular senescence is the primary ageing process at cell level, associated with loss of proliferative capacity, mitochondrial dysfunction and significantly altered patterns of expression and secretion of bioactive molecules. Intervention experiments have proven cell senescence as a relevant cause of ageing in many organs. In case of skin, accumulation of senescence in all major compartments with ageing is well documented and might be responsible for most, if not all, the molecular changes observed during ageing. Incorporation of senescent cells into in-vitro skin models (specifically 3D full thickness models) recapitulates changes typically associated with skin ageing. However, crucial evidence is still missing. A beneficial effect of senescent cell ablation on skin ageing has so far only been shown following rather unspecific interventions or in transgenic mouse models. We conclude that evidence for cellular senescence as a relevant cause of intrinsic skin ageing is highly suggestive but not yet completely conclusive.  相似文献   
58.
尿毒清颗粒治疗慢性肾功能衰竭临床研究   总被引:1,自引:0,他引:1  
张红改  孙亭如  夏祖生 《新中医》2021,53(4):102-105
目的:观察尿毒清颗粒治疗慢性肾功能衰竭(CRF)的临床疗效及其对钙磷代谢、结缔组织生长因子(CTGF)的影响。方法:选取120例CRF患者,按随机数字表法分为对照组和观察组各60例。对照组采用常规治疗,包括控制饮食、纠正酸碱、水电解质平衡;观察组在对照组的基础上加用尿毒清颗粒治疗。2组均连续治疗2个月,观察比较2组肾功能[肌酐(SCr)、血尿素氮(BUN)]、血磷(P3-)、血钙(Ca2+)、甲状旁腺激素(PTH)、CTGF指标水平变化,并评定2组临床疗效及不良反应情况。结果:观察组总有效率为80.00%,对照组为61.67%,2组比较,差异有统计学意义(P<0.05)。治疗后,2组SCr、BUN水平均较治疗前降低(P<0.05),且观察组SCr、BUN水平均低于对照组(P<0.05)。治疗后,2组PTH、CTGF、P3-水平较治疗前降低(P<0.05),Ca2+水平较治疗前升高(P<0.05);观察组PTH、P3-、CTGF水平均低于对照组(P<0.05),Ca2+水平高于对照组(P<0.05)。观察组不良反应发生率为3.33%,对照组为16.67%,2组比较,差异有统计学意义(P<0.05)。结论:尿毒清颗粒治疗CRF临床疗效显著,可有效调节钙磷代谢、CTGF平衡,改善肾功能,且安全性较高。  相似文献   
59.
The initial clinical presentation of infantile myofibromatosis can vary from subtle skin changes to large tumors. Here, we describe a case of congenital generalized infantile myofibromatosis which presented with diffuse hypopigmented macules, some with subtle atrophy and telangiectasia. Further workup revealed visceral involvement which led to treatment with systemic chemotherapy. Awareness of this rare clinical presentation is crucial to expedite workup and treatment given the poor prognosis in infants with visceral involvement.  相似文献   
60.
慢性伤口迁延不愈。外源性电刺激提供促进慢性伤口愈合的电流,其独特优势是使电荷调控伤口,促进伤 口愈合,具有良好的应用前景,并成为目前组织学研究者和临床医生的研究热点之一。现介绍一些常见慢性伤口 的形态学和电生理特性,主要探讨目前电荷调控伤口愈合的形态学改变、可能作用机制及其影响因素。  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