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   82150篇
  免费   8428篇
  国内免费   532篇
耳鼻咽喉   282篇
儿科学   2800篇
妇产科学   2063篇
基础医学   4082篇
口腔科学   1747篇
临床医学   24823篇
内科学   9790篇
皮肤病学   696篇
神经病学   3681篇
特种医学   827篇
外国民族医学   2篇
外科学   6173篇
综合类   7094篇
一般理论   66篇
预防医学   16676篇
眼科学   378篇
药学   5667篇
  166篇
中国医学   1104篇
肿瘤学   2993篇
  2024年   159篇
  2023年   2703篇
  2022年   2668篇
  2021年   4688篇
  2020年   4923篇
  2019年   4858篇
  2018年   4523篇
  2017年   4039篇
  2016年   3661篇
  2015年   3499篇
  2014年   6327篇
  2013年   7147篇
  2012年   4732篇
  2011年   4860篇
  2010年   3625篇
  2009年   3708篇
  2008年   3476篇
  2007年   3609篇
  2006年   3073篇
  2005年   2578篇
  2004年   2105篇
  2003年   1632篇
  2002年   1215篇
  2001年   1093篇
  2000年   991篇
  1999年   836篇
  1998年   682篇
  1997年   574篇
  1996年   476篇
  1995年   364篇
  1994年   333篇
  1993年   308篇
  1992年   233篇
  1991年   198篇
  1990年   184篇
  1989年   141篇
  1988年   131篇
  1987年   116篇
  1986年   85篇
  1985年   118篇
  1984年   100篇
  1983年   61篇
  1982年   68篇
  1981年   47篇
  1980年   47篇
  1979年   34篇
  1978年   18篇
  1977年   19篇
  1976年   11篇
  1975年   14篇
排序方式: 共有10000条查询结果,搜索用时 164 毫秒
71.
目的探讨中医特色护理联合全程优质护理对心肌梗死后心律失常的应用效果。方法收集2017年1月-2018年12月收治的心肌梗死后心律失常患者88例,随机分为试验组和对照组,各44例。对照组患者予以全程优质护理。试验组患者予以全程优质护理联合中医特色护理。比较2组患者护理满意度及心理焦虑、抑郁评分。结果干预后2组心理焦虑、抑郁评分均降低(P<0.05);与对照组相比,试验组护理满意率较高,试验组心理焦虑、抑郁评分较低(P<0.05)。结论全程优质护理联合中医特色护理在心肌梗死后心律失常患者的护理中具有积极作用,能够改善心理健康状态。  相似文献   
72.
To provide policy recommendations for managing Coronavirus 19 (COVID-19) in skilled nursing facilities, a group of certified medical directors from several facilities in New York state with experience managing the disease used e-mail, phone, and video conferencing to develop consensus recommendations. The resulting document provides recommendations on screening, protection of staff, screening of residents, management of Coronavirus 19 positive and presumed positive cases, communication during an outbreak, management of admissions and readmissions, and providing emotional support for staff. These consensus guidelines have been endorsed by the Executive Board of the New York Medical Directors Association and the Board of the Metropolitan Area Geriatrics Society.  相似文献   
73.
74.
75.
ObjectiveThe objective of this study was to investigate the association between morphological variation and postsurgical pulmonary vein (PV) stenosis (PPVS) in patients with cardiac total anomalous pulmonary venous connection (TAPVC).MethodsThis single-center, retrospective study included 168 pediatric patients who underwent surgical repair of cardiac TAPVC from 2013 to 2019 (connection to the coronary sinus [CS], n = 136; connection directly to the right atrium [RA], n = 32). Three-dimensional computed tomography modeling and geometric analysis were performed to investigate the morphological features; their relevance to the PPVS was examined.ResultsThe connection type had no association with PPVS (CS type: 18% vs right atrial type: 19%; P = .89) but there was a higher incidence of PPVS in patients with a single PV orifice than > 1 orifice (P < .001). Confluence-to-total PV area ratio (hazard ratio, 4.78, 95% CI, 1.86-12.32; P = .001) and length of drainage route (hazard ratio, 1.22; 95% CI, 1.14-1.31; P < .001) had a 4- and 1-fold increase in the risk for PPVS in the CS type after adjustment for age and preoperative pulmonary venous obstruction. In the right atrial type, those with anomalous PV return to the RA roof were more likely to develop PPVS than to the posterior wall of the RA (P < .001).ConclusionsThe number of inter-junction PV orifice correlated with PPVS development in cardiac TAPVC. The confluence-to-total PV ratio, length of drainage route, and anomalous PV return to the RA roof are important predictors for PPVS. Morphological subcategorization in this clinical setting can potentially assist in surgical decision-making.  相似文献   
76.
目的:总结典型国家基层卫生服务提供中实现医防整合的经验,为我国基层医疗卫生服务整合提供借鉴。方法:本研究方法为文献研究。结果:在个人层面,英国、泰国、古巴培养全科医生作为"守门人"并将其作为提供医防整合服务的主体;在机构层面,各国基层机构组成服务网络,内部强调跨学科合作;在体系层面,通过横向合作和有序的首诊与转诊协调服务;国家立法保障和健康保险筹资等引导支持基层医疗卫生服务整合。结论:培养和配置高质量的医防一体的全科医生、促进机构跨学科融合、通过立法和筹资体系予以保障是各国提供基层整合型服务的核心,值得我国基层医防服务整合借鉴。  相似文献   
77.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  相似文献   
78.
79.
Matrix metalloproteinase-11 (MMP11) is an enzyme with proteolytic activity against matrix and nonmatrix proteins. Although most MMPs are secreted as inactive proenzymes and are later activated extracellularly, MMP11 is activated intracellularly by furin within the constitutive secretory pathway. It is a key factor in physiological tissue remodeling and its alteration may play an important role in the progression of epithelial malignancies and other diseases. TCGA colon and colorectal adenocarcinoma data showed that upregulation of MMP11 expression correlates with tumorigenesis and malignancy. Here, we provide evidence that a germline variant in the MMP11 gene (NM_005940: c.232C>T; p.(Pro78Ser)), identified by whole exome sequencing, can increase the tumorigenic properties of colorectal cancer (CRC) cells. P78S is located in the prodomain region, which is responsible for blocking MMP11's protease activity. This variant was detected in the proband and all the cancer-affected family members analyzed, while it was not detected in healthy relatives. In silico analyses predict that P78S could have an impact on the activation of the enzyme. Furthermore, our in vitro analyses show that the expression of P78S in HCT116 cells increases tumor cell invasion and proliferation. In summary, our results show that this variant could modify the structure of the MMP11 prodomain, producing a premature or uncontrolled activation of the enzyme that may contribute to an early CRC onset in these patients. The study of this gene in other CRC cases will provide further information about its role in CRC development, which might improve patient treatment in the future.  相似文献   
80.
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