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   8456篇
  免费   711篇
  国内免费   33篇
耳鼻咽喉   116篇
儿科学   286篇
妇产科学   181篇
基础医学   1421篇
口腔科学   381篇
临床医学   733篇
内科学   1869篇
皮肤病学   219篇
神经病学   825篇
特种医学   169篇
外科学   913篇
综合类   42篇
一般理论   2篇
预防医学   725篇
眼科学   146篇
药学   633篇
中国医学   30篇
肿瘤学   509篇
  2023年   56篇
  2022年   139篇
  2021年   302篇
  2020年   180篇
  2019年   313篇
  2018年   307篇
  2017年   233篇
  2016年   234篇
  2015年   301篇
  2014年   370篇
  2013年   429篇
  2012年   614篇
  2011年   653篇
  2010年   364篇
  2009年   299篇
  2008年   530篇
  2007年   516篇
  2006年   496篇
  2005年   501篇
  2004年   380篇
  2003年   357篇
  2002年   311篇
  2001年   151篇
  2000年   146篇
  1999年   113篇
  1998年   50篇
  1997年   55篇
  1996年   29篇
  1995年   39篇
  1994年   37篇
  1993年   28篇
  1992年   80篇
  1991年   56篇
  1990年   59篇
  1989年   52篇
  1988年   43篇
  1987年   47篇
  1986年   47篇
  1985年   37篇
  1984年   23篇
  1983年   24篇
  1982年   17篇
  1979年   11篇
  1976年   13篇
  1975年   12篇
  1972年   12篇
  1970年   18篇
  1969年   11篇
  1968年   16篇
  1967年   10篇
排序方式: 共有9200条查询结果,搜索用时 15 毫秒
1.
2.

Background and objectives

A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.

Case report

A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.

Conclusion

Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma.  相似文献   
3.
4.
Abstract

Background: Cerebral palsy (CP) is a common childhood disability. However, these individuals are now living longer lives, participating in adult roles, and seeking healthcare services. The transition from pediatric to adult healthcare for adolescents with CP is a challenging yet significant time. Adolescents experience several barriers during transition.

Objectives: To utilize the environmental and personal dimensions of the ICF model in order to explore barriers when transitioning to adulthood as well as discuss characteristics and physical therapy implications needed to succeed within transition.

Methods: Electronic searching of PubMed, CINAHL, ERIC, Scopus, ProQuest, and the Cochrane Library databases was concluded on January 9, 2019 for studies including transition between pediatric and adult healthcare in individuals diagnosed with CP. Two independent reviewers agreed upon inclusion, eligibility, and quality assessment of each study using the Mixed-Methods Appraisal Tool (MMAT).

Results: Seven studies were included in the systematic review. Results for each study were separated based on the personal and environmental contextual factors of the ICF model and solutions to the barriers were then discussed.

Conclusions: Research has provided proposed solutions to select barriers, however, other barriers have yet to be addressed. More research is needed to address these barriers and provide a model program that can be implemented within the healthcare systems to promote a successful transition for adolescents with CP from pediatric to adult services.  相似文献   
5.
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed.  相似文献   
6.
7.
8.
Group A Streptococcus (GAS) predominantly exists as a colonizer of the human oropharynx that occasionally breaches epithelial barriers to cause invasive diseases. Despite the frequency of GAS carriage, few investigations into the contributory molecular mechanisms exist. To this end, we identified a naturally occurring polymorphism in the gene encoding the streptococcal collagen-like protein A (SclA) in GAS carrier strains. All previously sequenced invasive serotype M3 GAS possess a premature stop codon in the sclA gene truncating the protein. The carrier polymorphism is predicted to restore SclA function and was infrequently identified by targeted DNA sequencing in invasive strains of the same serotype. We demonstrate that a strain with the carrier sclA allele expressed a full-length SclA protein, while the strain with the invasive sclA allele expressed a truncated variant. An isoallelic mutant invasive strain with the carrier sclA allele exhibited decreased virulence in a mouse model of invasive disease and decreased multiplication in human blood. Further, the isoallelic invasive strain with the carrier sclA allele persisted in the mouse nasopharynx and had increased adherence to cultured epithelial cells. Repair of the premature stop codon in the invasive sclA allele restored the ability to bind the extracellular matrix proteins laminin and cellular fibronectin. These data demonstrate that a mutation in GAS carrier strains increases adherence and decreases virulence and suggest selection against increased adherence in GAS invasive isolates.  相似文献   
9.
Purpose: The purpose of this study was to determine the effectiveness of an individualized physical rehabilitation programs aimed at improving respiratory function in women with post-mastectomy syndrome. Methods: In a randomized controlled trial 50 women with post-mastectomy syndrome were enrolled in the experimental group (EG, n 25) or the comparison group (CG, n 25). The program for the EG included: aqua aerobics (i.e. aqua jogging, aqua building, and aqua stretching); conditional swimming; and recreational aerobics. The program for the CG included: conditional swimming and Pilates exercises. Both intervention groups attended individualized physical rehabilitation programs three times per week for 48 weeks. The primary outcome measure was spirometry of the patients measured before, 6 and 12 months after the intervention. Results: This study demonstrated that most of the respiratory function parameters increased significantly in both groups over the year of exercise training. After the year of training the individualized physical rehabilitation program for the EG was significantly better (p < 0.01) as compared with the CG, except for inspiratory reserve volume and maximal voluntary ventilation, which were not statistically different. Conclusions: The results of the study suggest that individual programs of physical rehabilitation could be considered effective for the improvement of respiratory function of the patients with post-mastectomy syndrome. The results obtained could serve as a basis for more widespread clinical program development.  相似文献   
10.
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