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   3792篇
  免费   212篇
  国内免费   33篇
耳鼻咽喉   28篇
儿科学   149篇
妇产科学   36篇
基础医学   331篇
口腔科学   114篇
临床医学   302篇
内科学   911篇
皮肤病学   59篇
神经病学   161篇
特种医学   268篇
外科学   699篇
综合类   185篇
一般理论   1篇
预防医学   287篇
眼科学   59篇
药学   228篇
中国医学   17篇
肿瘤学   202篇
  2023年   32篇
  2022年   58篇
  2021年   113篇
  2020年   61篇
  2019年   82篇
  2018年   104篇
  2017年   67篇
  2016年   76篇
  2015年   76篇
  2014年   155篇
  2013年   166篇
  2012年   206篇
  2011年   243篇
  2010年   165篇
  2009年   163篇
  2008年   194篇
  2007年   195篇
  2006年   177篇
  2005年   172篇
  2004年   147篇
  2003年   162篇
  2002年   158篇
  2001年   78篇
  2000年   75篇
  1999年   65篇
  1998年   66篇
  1997年   50篇
  1996年   50篇
  1995年   37篇
  1994年   44篇
  1993年   36篇
  1992年   38篇
  1991年   43篇
  1990年   40篇
  1989年   39篇
  1988年   43篇
  1987年   60篇
  1986年   34篇
  1985年   39篇
  1984年   18篇
  1983年   17篇
  1982年   17篇
  1981年   13篇
  1980年   11篇
  1979年   16篇
  1978年   21篇
  1977年   11篇
  1976年   14篇
  1973年   11篇
  1969年   13篇
排序方式: 共有4037条查询结果,搜索用时 0 毫秒
71.
X‐linked intellectual deficiency (XLID) is a large group of genetic disorders. MED12 gene causes syndromic and nonsyndromic forms of XLID. Only seven pathological mutations have been identified in this gene. Here, we report a novel mutation segregating with XLID phenotype. This mutation could be in favor of genotype–phenotype correlations.  相似文献   
72.
BACKGROUND: Because of the aging of the American population, osteoporotic vertebral fractures are becoming a common problem in the elderly. Minimally invasive percutaneous vertebral augmentation techniques have gained a great deal of importance in relieving the pain associated with these fractures, and are becoming the standard of care. METHODS: These procedures involve the injection of polymethylmethacrylate (PMMA) into the vertebral body. However, these techniques have their complications, and among these, pulmonary embolism is one of the most feared. It is attributable to the passage of cement into the pulmonary vasculature. After encountering a case of PMMA embolism in our practice, we decided to highlight this topic and discuss the incidence, clinical presentation, diagnosis, and treatment of cement pulmonary embolisms.  相似文献   
73.
74.

PURPOSE

To compare the changes in the occlusal vertical dimension, activity of masseter muscles and biting force after insertion of immediate denture constructed with conventional, tooth-supported and Implant-supported immediate mandibular complete denture.

MATERIALS AND METHODS

Patients were selected and treatment was carried out with all the three different concepts i.e, immediate denture constructed with conventional (Group A), tooth-supported (Group B) and Implant-supported (Group C) immediate mandibular complete dentures. Parameters of evaluation and comparison were occlusal vertical dimension measured by radiograph (at three different time intervals), Masseter muscle electromyographic (EMG) measurement by EMG analysis (at three different positions of jaws) and bite force measured by force transducer (at two different time intervals). The obtained data were statistically analyzed by using ANOVA-F test at 5% level of significance. If the F test was significant, Least Significant Difference test was performed to test further significant differences between variables.

RESULTS

Comparison between mean differences in occlusal vertical dimension for tested groups showed that it was only statistically significant at 1 year after immediate dentures insertion. Comparison between mean differences in wavelet packet coefficients of the electromyographic signals of masseter muscles for tested groups was not significant at rest position, but significant at initial contact position and maximum voluntary clench position. Comparison between mean differences in maximum biting force for tested groups was not statistically significant at 5% level of significance.

CONCLUSION

Immediate complete overdentures whether tooth or implant supported prosthesis is recommended than totally mucosal supported prosthesis.  相似文献   
75.
Diabetes demands early diagnosis, prompt treatment, continuous monitoring and follow up. Physicians play a pivotal role in diabetes management. However, evidence suggests that sub-optimal knowledge of guidelines and other issues may lead to ineffective management and poor patient outcomes. The aim of this research was to identify clinical diabetologist's perspectives on evidence based diabetes management, benefits of and barriers to the practice of evidence based guidelines in management of type 2 diabetes. Clinical diabetologists were administered a semi-structured questionnaire. Qualitative responses were analysed to identify key words, phrases and concepts from respondents. Majority of diabetologist (78.2%) preferred ADA guidelines alone or in combination with others guidelines where as 12.7% diabetologist follow all the guidelines on case by case basis. 27% and 25% diabetologists opined that guidelines ensure uniform standard of care across patient and achievement of diabetes management goals respectively. Poor awareness among physicians (22.7%), western guidelines being not applicable to Indian patients (22.7%), cost to patient (18.2%) were some of the barrier to practice of evidence based diabetes management. Some of the mechanism suggested to improve the practice of evidence based diabetes management included education of physicians in EBM (28.9%), making practice of evidence based guidelines legally binding (10.5%) and wider dissemination of existing guidelines (7.8%).  相似文献   
76.
77.
Hypocalcemia secondary to hypoparathyroidism is a rare cause of congestive heart failure. However, its early recognition and treatment lead to significant improvement in cardiac function. We report a middle-aged woman presenting with symptoms of heart failure with a serum calcium level of 3.7 mg/dl and a serum inorganic phosphate level of 17.6 mg/dl 22 years after subtotal thyroidectomy. Besides calcium and calcitriol supplementation, she was the first patient with severe hypocalcemic cardiomyopathy to be given off-label recombinant human parathyroid hormone (PTH) because of an elevated serum calcium-phosphate product. We discuss the management and outcome of the patient and then present a brief review of similar previously reported cases. We also describe the pivotal role of calcium ion and the potential role of PTH in maintaining myocardial contractility, effective natriuresis, and possible pathogenic mechanisms contributing to heart failure secondary to hypocalcemia and hypoparathyroidism.  相似文献   
78.
79.
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