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   273220篇
  免费   21596篇
  国内免费   8658篇
耳鼻咽喉   1264篇
儿科学   8856篇
妇产科学   1976篇
基础医学   23133篇
口腔科学   3680篇
临床医学   30836篇
内科学   77181篇
皮肤病学   2785篇
神经病学   26763篇
特种医学   8238篇
外国民族医学   4篇
外科学   21056篇
综合类   39829篇
现状与发展   33篇
一般理论   11篇
预防医学   18876篇
眼科学   2365篇
药学   20300篇
  212篇
中国医学   12253篇
肿瘤学   3823篇
  2024年   478篇
  2023年   5167篇
  2022年   6970篇
  2021年   13872篇
  2020年   13122篇
  2019年   10269篇
  2018年   10185篇
  2017年   9922篇
  2016年   10119篇
  2015年   10016篇
  2014年   19278篇
  2013年   20884篇
  2012年   15761篇
  2011年   17206篇
  2010年   13538篇
  2009年   13054篇
  2008年   13158篇
  2007年   13072篇
  2006年   11505篇
  2005年   9739篇
  2004年   8145篇
  2003年   7096篇
  2002年   6009篇
  2001年   5314篇
  2000年   4333篇
  1999年   3859篇
  1998年   3621篇
  1997年   3309篇
  1996年   2858篇
  1995年   2580篇
  1994年   2370篇
  1993年   2027篇
  1992年   1902篇
  1991年   1690篇
  1990年   1354篇
  1989年   1200篇
  1988年   1099篇
  1987年   995篇
  1986年   869篇
  1985年   1039篇
  1984年   878篇
  1983年   524篇
  1982年   634篇
  1981年   552篇
  1980年   419篇
  1979年   351篇
  1978年   284篇
  1977年   252篇
  1976年   217篇
  1975年   109篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
目的探讨胸痹心痛病患者的中医心脏康复护理意义。方法选取2018年1月-2019年1月在大连中医医院内一病房就诊的80例胸痹心痛病患者,经辨证分型为气虚血瘀型胸痹,随机分为试验组和对照组,对照组40例采取常规护理,试验组40例在对照组的基础上使用中医心脏康复护理,主要包括:证候施护、饮食护理、中医特色技术、情志护理、健康指导等。通过中医证候评分对治疗的有效率进行观察。结果试验组有效率为92.5%,对照组有效率为77.5%,试验组优于对照组,差异有统计学意义(P<0.05)。结论对胸痹心痛病患者的中医心脏康复护理,可以有效提高临床有效率,改善临床症状,提高患者生活质量,值得在临床推广。  相似文献   
102.
目的探讨佛山市乙肝母婴阻断工作中存在的问题,为完善进一步工作提供思路。 方法采用队列研究的方法,以2017年佛山市HBsAg阳性产妇13 672例及其所分娩13 982例活产儿为研究对象,通过回顾性病历采集及前瞻性的随访追踪的方法,全面了解影响乙肝母婴阻断工作的主要因素。 结果2017年佛山市产妇HBsAg阳性率为10.14%,感染孕妇中HBeAg阳性率为24.13%,孕期HBV DNA检测率约5%,其中抗病毒治疗63例;新生儿乙肝免疫球蛋白接种率为99.84%;婴儿在出生后1年内完成乙肝疫苗三针接种的比率为81.71%,在完成三针乙肝疫苗接种的儿童中按照0-1-6程序接种的比率为62.65%;母婴阻断结果追踪率为40.16%,追踪儿童中母婴阻断失败34例,失败率为0.61%;产妇年龄低、HBeAg阳性、HepB未全程及规范接种是母婴阻断失败的危险因素(P<0.05)。儿童明确未检测的主要原因是拒绝检查、不知道要检查、提前检查和检测未提供结果,占99.07%。 结论加强信息沟通及健康教育,落实乙肝病毒感染产妇孕期DNA检测及抗病毒治疗,提高儿童乙肝疫苗的规范接种率,将暴露儿童的乙肝两对半检测纳入儿童保健管理工作,是实现全市乙肝母婴零传播的重要措施。  相似文献   
103.
Hailey–Hailey disease (HHD), also known as benign familial pemphigus, is an autosomal dominant skin condition that affects the adhesion of epidermal keratinocytes. Although the initial manifestation of flaccid vesicles on erythematous or normal skin in flexure sites frequently goes unnoticed, large, macerated, exudative plaques of superficial erosions with crusting are observed at the time of diagnosis. There is no specific treatment for HHD, and most cases are symptomatically supported. However, infrared laser ablation has been somewhat helpful. We present a case successfully treated with fractional CO2 laser showing a long-term favourable outcome and no adverse effects. Thus, this modality could be an alternative to full ablation for this condition.  相似文献   
104.
105.
Plasma provided by COVID-19 convalescent patients may provide therapeutic relief as the number of COVID-19 cases escalates steeply worldwide. Prior findings in various viral respiratory diseases including SARS-CoV-related pneumonia suggest that convalescent plasma can reduce mortality, although formal proof of efficacy is still lacking. By reducing viral spread early on, such an approach may possibly downplay subsequent immunopathology. Identifying, collecting, qualifying and preparing plasma from convalescent patients with adequate SARS-CoV-2-neutralizing Ab titres in an acute crisis setting may be challenging, although well within the remit of most blood establishments. Careful clinical evaluation should allow to quickly establish whether such passive immunotherapy, administered at early phases of the disease in patients at high risk of deleterious evolution, may reduce the frequency of patient deterioration, and thereby COVID-19 mortality.  相似文献   
106.
Objective: Report efficacy findings from three clinical trials (one phase 2 and two phase 3 [OPUS-1, OPUS-2]) of lifitegrast ophthalmic solution 5.0% for treatment of dry eye disease (DED).

Research design and methods: Three 84-day, randomized, double-masked, placebo-controlled trials. Adults (≥18 years) with DED were randomized (1:1) to lifitegrast 5.0% or matching placebo. Changes from baseline to day 84 in signs and symptoms of DED were analyzed.

Main outcome measures: Phase 2, pre-specified endpoint: inferior corneal staining score (ICSS; 0–4); OPUS-1, coprimary endpoints: ICSS and visual-related function subscale (0–4 scale); OPUS-2, coprimary endpoints: ICSS and eye dryness score (EDS, VAS; 0–100).

Results: Fifty-eight participants were randomized to lifitegrast 5.0% and 58 to placebo in the phase 2 trial; 293 to lifitegrast and 295 to placebo in OPUS-1; 358 to lifitegrast and 360 to placebo in OPUS-2. In participants with mild-to-moderate baseline DED symptomatology, lifitegrast improved ICSS versus placebo in the phase 2 study (treatment effect, 0.35; 95% CI, 0.05–0.65; p?=?0.0209) and OPUS-1 (effect, 0.24; 95% CI, 0.10–0.38; p?=?0.0007). Among more symptomatic participants (baseline EDS ≥40, recent artificial tear use), lifitegrast improved EDS versus placebo in a post hoc analysis of OPUS-1 (effect, 13.34; 95% CI, 2.35–24.33; nominal p?=?0.0178) and in OPUS-2 (effect, 12.61; 95% CI, 8.51–16.70; p?<?0.0001).

Limitations: Trials were conducted over 12 weeks; efficacy beyond this period was not assessed.

Conclusions: Across three trials, lifitegrast improved ICSS in participants with mild-to-moderate baseline symptomatology in two studies, and EDS in participants with moderate-to-severe baseline symptomatology in two studies. Based on the overall findings from these trials, lifitegrast shows promise as a new treatment option for signs and symptoms of DED.  相似文献   
107.
Premature infants are physiologically immature and are particularly vulnerable to systemic illnesses. Instability of vital signs related to immaturity of organ systems are common but may also represent early manifestations of serious illness. While vital signs are frequently or continuously monitored in critically unwell neonates, changes in these parameters are subtle in the early phase of illness such as sepsis and difficult to interpret using traditional neonatal monitoring tools. Recent advances in identifying trends and patterns of vital signs in the pre-clinical phase of the illness, particularly in the field of heart rate characteristics monitoring has opened up the potential to improve outcomes through rapid and timely investigations and early intervention. This article reviews the current evidence in predictive monitoring of neonates and discusses potential clinical implications.  相似文献   
108.
109.
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates.  相似文献   
110.
Nonalcoholic fatty liver disease (NAFLD) is a major cause of liver‐related morbidity; its prevalence is elevating due to the rising epidemic of obesity. Several clinical trials have examined the effects of curcumin supplementation on anthropometric variables in NAFLD patients with inconclusive results. This dose–response meta‐analysis aimed to evaluate the impact of curcumin supplementation on body mass index (BMI), body weight, and waist circumference (WC) in patients with NAFLD. A systematic review of the literature was conducted using PubMed/Medline, ISI Web of Science, Scopus, Cochrane Library, EMBASE, Google Scholar, Sid.ir, and Magiran.com to identify eligible studies up to March 2019. A meta‐analysis of eligible studies was performed using the random‐effects model to estimate the pooled effect size. Eight randomized controlled trials with 520 participants (curcumin group = 265 and placebo group = 255) were included. Supplementation dose and duration ranged from 70 to 3,000 mg/day and 8 to 12 weeks, respectively. Curcumin supplementation significantly reduced BMI (weighted mean difference [WMD] = ?0.34 kg/m2, 95% CI [?0.64, ?0.04], p < .05) and WC (WMD = ?2.12 cm, 95% CI [?3.26, ?0.98], p < .001). However, no significant effects of curcumin supplementation on body weight were found. These results suggest that curcumin supplementation might have a positive effect on visceral fat and abdominal obesity that have been associated with NAFLD.  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