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   274026篇
  免费   23090篇
  国内免费   14445篇
耳鼻咽喉   2586篇
儿科学   3741篇
妇产科学   5267篇
基础医学   32554篇
口腔科学   4724篇
临床医学   34386篇
内科学   46404篇
皮肤病学   3299篇
神经病学   16209篇
特种医学   9893篇
外国民族医学   96篇
外科学   32375篇
综合类   34329篇
现状与发展   48篇
一般理论   83篇
预防医学   17550篇
眼科学   7413篇
药学   26286篇
  164篇
中国医学   10912篇
肿瘤学   23242篇
  2024年   732篇
  2023年   3677篇
  2022年   9001篇
  2021年   12213篇
  2020年   8879篇
  2019年   8314篇
  2018年   8860篇
  2017年   7652篇
  2016年   7396篇
  2015年   10891篇
  2014年   13971篇
  2013年   13390篇
  2012年   20143篇
  2011年   21821篇
  2010年   13179篇
  2009年   10585篇
  2008年   14959篇
  2007年   15143篇
  2006年   14610篇
  2005年   14730篇
  2004年   10692篇
  2003年   9591篇
  2002年   8469篇
  2001年   6240篇
  2000年   6263篇
  1999年   6646篇
  1998年   4032篇
  1997年   3948篇
  1996年   3009篇
  1995年   2860篇
  1994年   2400篇
  1993年   1656篇
  1992年   2400篇
  1991年   2095篇
  1990年   1740篇
  1989年   1529篇
  1988年   1333篇
  1987年   1237篇
  1986年   1018篇
  1985年   810篇
  1984年   570篇
  1983年   455篇
  1982年   317篇
  1981年   279篇
  1980年   264篇
  1979年   278篇
  1978年   172篇
  1977年   152篇
  1976年   120篇
  1974年   141篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
91.

Introduction

For never-smokers (smoked <100 lifetime cigarettes), lung cancer (LC) has emerged as an important issue. We aimed to investigate the effects of prevalence changes in tobacco smoking and particulate matter (PM) 2.5 (PM2.5) levels on LC in Taiwan, in relation to contrasting PM2.5 levels, between Northern Taiwan (NT) and Southern Taiwan (ST).

Methods

We reviewed 371,084 patients with LC to assess smoking prevalence and correlations between the incidence of adenocarcinoma lung cancer (AdLC) and non-AdLC. Two subsets were selected to assess different AdLC stage trends and the effect of PM2.5 on survival of patients with AdLC.

Results

From 1995 to 2015, the proportion of male adult ever-smokers decreased from 59.4% to 29.9% whereas the female smoking rate remained low (3.2% to 5.3%). AdLC incidence in males and females increased from 9.06 to 23.25 and 7.05 to 24.22 per 100,000 population, respectively. Since 1993, atmospheric visibility in NT improved (from 7.6 to 11.5 km), but deteriorated in ST (from 16.3 to 4.2 km). The annual percent change in AdLC stages IB to IV was 0.3% since 2009 (95% confidence interval [CI]: -1.9%–2.6%) in NT, and 4.6% since 2007 (95% CI: 3.3%–5.8%) in ST; 53% patients with LC had never smoked. Five-year survival rates for never-smokers, those with EGFR wild-type genes, and female patients with AdLC were 12.6% in NT and 4.5% in ST (hazard ratio: 0.79, 95% CI: 0.70–0.90).

Conclusions

In Taiwan, greater than 50% of patients with LC had never smoked. PM2.5 level changes can affect AdLC incidence and patient survival.  相似文献   
92.
93.
94.
95.
综述近年中医药治疗慢性前列腺炎的临床研究,认为本病病因病机之核心在于脾肾亏虚为本,湿热、痰浊、瘀毒为标,病久则伤及脾肾,由实转虚。中医内治法主要以辨证论治、辨病论治或单方验方为主,外治法以中药洗浴、中药灌肠、肛门给药、针灸为主。中医药治疗本病优势明显。应继续完善对中医药作用机制的认识,制订统一的辨证论治及疗效评价标准,针对效果显著的名方开展研究。  相似文献   
96.
97.
苏州科技城医院坐落于苏州高新区太湖之滨,由苏州高新区政府投资新建,是一所集医疗、科研、康复、预防于一体的三级综合性公立医院。医院占地面积140亩,总建筑面积180000m~2,总投资额16亿,设计床位1200张。医院于2013年9月29日奠基,2014年12月28日主体封顶,2016年4月正式投入使用,比预定日期提前了将近1年!  相似文献   
98.
Objective To observe the clinical characteristics and prognosis of patients with rapidly progressive glomerulonephritis (RPGN) caused by lupus nephritis, antineutrophil cytoplasmic antibodies (ANCA)-associated vasculitis, or primary glomerulonephritis who were treated with peritoneal dialysis (PD) and then withdrew PD because of renal recovery. Methods Data of the above patients were retrospectively analyzed. The patients were diagnosed as RPGN and received PD therapy in Kidney Disease Center, the First Affiliated Hospital, College of Medicine, Zhejiang University from February 2009 to August 2018. The patients were divided into early withdrawal group (PD time≤183 days, n=24) and late withdrawal group (PD time>183 day, n=24). The differences of clinical characteristics between the two groups were compared. The cumulative incidence of adverse events in both groups was analyzed using Kaplan-Meier curves. Cox proportional hazards model was used to analyze the risk factors influencing the prognosis of patients. Results Forty-eight RPGN patients were included. The median time of maintaining PD was 178(76, 378) days. Compared with the late withdrawal group, the patients in early withdrawal group had lower levels of urine volume, serum albumin and parathyroid hormone, and lower rates of gross hematuria and hypertension at the beginning of PD, and received higher rates of methylprednisolone impulse, combined immunosuppressive agents, and hemodialysis or continuous renal replacement therapy (all P<0.05). At the time of PD withdrawal, the levels of serum creatinine, serum calcium, serum albumin and parathyroid hormone in the early withdrawal group were significantly lower than those in the late withdrawal group (all P<0.05). The Kaplan-Meier curves showed that there was no significant difference in the cumulative survival of patients in both groups (log-rank test χ2=3.485, P=0.062). Cox regression analysis revealed serum creatinine≥209 μmol/L at the time of PD withdrawal was an independent risk factor for poor prognosis (HR=5.253,95%CI 1.757-15.702, P=0.003). Conclusions PD can be used for RPGN patients caused by lupus nephritis, ANCA-associated vasculitis and primary nephritis. Serum creatinine≥209 μmol/L at the time of PD withdrawal is an independent risk factor for poor prognosis.  相似文献   
99.
The jobs of Latino manual laborers place their mental and physical health at risk. This study evaluates the associations among musculoskeletal pain, mental health, and work organization in Latino manual laborers. Farmworkers and nonfarmworkers (n = 189) in North Carolina were interviewed for self-reported musculoskeletal pain, depressive symptoms, stress, work safety climate, and precarious job status. More nonfarmworkers than farmworkers had neck and shoulder pain, but they did not differ in other areas of musculoskeletal pain. Depressive symptoms had a significant association with neck and shoulder pain (p < .05). Precariousness had a significant association with back pain (p < .05). Farmworker participants had H-2A visas and were afforded some protection compared to nonfarmworker manual workers. Research is needed to improve policy that relieves pain and improves mental health for all Latino manual workers.  相似文献   
100.
目的观察疏肝健脾颗粒剂(Shugan Jianpi Granule,SGJP)治疗乳腺癌癌因性疲乏(breast cancer related fatigue,BCRF)的临床疗效。方法采用单臂临床试验方法,纳入40例BCRF肝郁脾虚证患者,服用SGJP 8周,观察治疗前及治疗后4、8、12周Piper疲乏自评量表(PFS)、体能状况(ECOG)评分、中医证候量表、综合性医院焦虑抑郁量表(HAD)评分、匹茨堡睡眠质量指数量表(PSQI)评分及血尿便常规、生化等安全性指标。结果38例患者完成全部随访,2例发生脱落。PFS、中医证候量表、HAD焦虑量表评分均在试验第4、8、12周显著下降,ECOG评分、HAD抑郁量表均在试验第8、12周显著下降,PSQI评分在治疗第12周显著下降,差异均有统计学意义(P<0.05)。在整个随访过程中,所有患者在治疗后未出现明显血常规、尿便常规及生化指标异常。结论SGJP可以减轻乳腺癌患者的疲乏,增强体力,改善焦虑抑郁及睡眠质量,值得临床借鉴。  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