全文获取类型
收费全文 | 658篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 13篇 |
妇产科学 | 11篇 |
基础医学 | 126篇 |
口腔科学 | 8篇 |
临床医学 | 46篇 |
内科学 | 126篇 |
皮肤病学 | 22篇 |
神经病学 | 111篇 |
特种医学 | 16篇 |
外国民族医学 | 4篇 |
外科学 | 70篇 |
综合类 | 2篇 |
预防医学 | 51篇 |
眼科学 | 11篇 |
药学 | 47篇 |
肿瘤学 | 18篇 |
出版年
2019年 | 11篇 |
2018年 | 8篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 14篇 |
2012年 | 9篇 |
2011年 | 25篇 |
2010年 | 14篇 |
2009年 | 9篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 16篇 |
2005年 | 24篇 |
2004年 | 22篇 |
2003年 | 22篇 |
2002年 | 21篇 |
2001年 | 27篇 |
2000年 | 28篇 |
1999年 | 35篇 |
1997年 | 6篇 |
1995年 | 6篇 |
1993年 | 6篇 |
1992年 | 15篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1981年 | 8篇 |
1979年 | 8篇 |
1976年 | 5篇 |
1975年 | 10篇 |
1974年 | 9篇 |
1973年 | 6篇 |
1972年 | 7篇 |
1970年 | 5篇 |
1969年 | 8篇 |
1948年 | 5篇 |
1947年 | 7篇 |
1932年 | 4篇 |
1929年 | 5篇 |
1927年 | 4篇 |
1926年 | 4篇 |
1925年 | 5篇 |
1924年 | 8篇 |
1923年 | 8篇 |
1922年 | 16篇 |
1921年 | 4篇 |
排序方式: 共有686条查询结果,搜索用时 15 毫秒
101.
102.
103.
Determination of Metamizol and its Hydrolysis Product by Quantitative TLC Metamizol and its degradation product, 4-methylaminophenazone, were determined by TLC and in situ measurement of their reflectances. In metamizol solutions, used for injections, hydrolysis reaches 3.6 to 4.0 %. This degradation is independent of the storage time. 相似文献
104.
105.
Summary Post-epidemic sera were collected from the recruits in a military camp and the content of antibody to A/Asia/57 was determined in a highly sensitive and specific haemagglutination inhibition test. Of 223 individuals examined 196 (88%) gave serological evidence of having been infected. Of 63 individuals hospitalized with a clinically typical influenza. 2 or 3 were serologically negative. Of 58 individuals with no typical influenza symptoms, antibody was demonstrated in 45 (78%). The most frequent incubation time before clinical symptoms occurred appeared to be 2 days.Supported by a grant from Forsvarets Sanitet. 相似文献
106.
107.
108.
Clever SL Ford DE Rubenstein LV Rost KM Meredith LS Sherbourne CD Wang NY Arbelaez JJ Cooper LA 《Medical care》2006,44(5):398-405
BACKGROUND: Depression is undertreated in primary care settings. Little research investigates the impact of patient involvement in decisions on guideline-concordant treatment and depression outcomes. OBJECTIVE: The objective of this study was to determine whether patient involvement in decision-making is associated with guideline-concordant care and improvement in depression symptoms. DESIGN: Prospective cohort study. SETTING: Multisite, nationwide randomized clinical trial of quality improvement strategies for depression in primary care. SUBJECTS: Primary care patients with current symptoms and probable depressive disorder. MEASUREMENTS: Patients rated their involvement in decision-making (IDM) about their care on a 5-point scale from poor to excellent 6 months after entry into the study. Depressive symptoms were measured every 6 months for 2 years using a modified version of the Center for Epidemiologic Studies-Depression (CES-D) scale. We examined probabilities (Pr) of receipt of guideline-concordant care and resolution of depression across IDM groups using multivariate logistic regression models controlling for patient and provider factors. RESULTS: For each 1-point increase in IDM ratings, the probability of patients' report of receiving guideline-concordant care increased 4% to 5% (adjusted Pr 0.31 vs. 0.50 for the lowest and highest IDM ratings, respectively, P < 0.001). Similarly, for each 1-point increase in IDM ratings, the probability of depression resolution increased 2% to 3% (adjusted Pr 0.10 vs. 0.19 for the lowest and highest IDM ratings respectively, P = 0.004). CONCLUSIONS: Depressed patients with higher ratings of involvement in medical decisions have a higher probability of receiving guideline-concordant care and improving their symptoms over an 18-month period. Interventions to increase patient involvement in decision-making may be an important means of improving care for and outcomes of depression. 相似文献
109.
BACKGROUND: The impact of depression on the workplace has been widely observed in studies examining absenteeism and reduced productivity during days at work. However, there is little scientific evidence about whether depression interventions are cost-beneficial to employers. OBJECTIVE: We construct a cost-benefit analysis of depression treatment under different workplace assumptions better reflecting the nature of employment. RESEARCH DESIGN: Data from a randomized controlled trial in which employed primary care patients with depression were treated in practices randomly assigned to an enhanced treatment intervention or usual care were used to construct a cost-benefit model from an employer perspective under different assumptions regarding employment. SUBJECTS: A national sample of 198 workers employed in a range of positions by companies was studied. MEASURES: Benefits included self-reported productivity and absenteeism; costs included intervention and treatment costs. Net benefit was calculated under different scenarios and return on investment (ROI) is derived. RESULTS: Enhanced depression treatment resulted in an average net benefit to the employer of Dollars 30 per participating worker in Year 1 of the intervention and Dollars 257 per participating worker in Year 2, for an estimated ROI during the 2-year period of 302%. ROI increased in firms that rely on team production, hire more costly substitute labor, or realize penalties for output shortfalls. ROI decreased in firms that have a large fraction of employees with dependent coverage and experience high turnover rates. Results also are sensitive to how subjectively reported productivity is valued. CONCLUSION: Many employers will receive a potentially significant ROI from depression treatment models that improve absenteeism and productivity at work. 相似文献
110.