全文获取类型
收费全文 | 3079篇 |
免费 | 261篇 |
国内免费 | 44篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 105篇 |
妇产科学 | 44篇 |
基础医学 | 380篇 |
口腔科学 | 108篇 |
临床医学 | 324篇 |
内科学 | 635篇 |
皮肤病学 | 23篇 |
神经病学 | 308篇 |
特种医学 | 251篇 |
外科学 | 360篇 |
综合类 | 50篇 |
一般理论 | 3篇 |
预防医学 | 333篇 |
眼科学 | 19篇 |
药学 | 271篇 |
中国医学 | 4篇 |
肿瘤学 | 152篇 |
出版年
2021年 | 31篇 |
2020年 | 18篇 |
2019年 | 52篇 |
2018年 | 68篇 |
2017年 | 35篇 |
2016年 | 49篇 |
2015年 | 82篇 |
2014年 | 96篇 |
2013年 | 90篇 |
2012年 | 138篇 |
2011年 | 134篇 |
2010年 | 93篇 |
2009年 | 65篇 |
2008年 | 133篇 |
2007年 | 141篇 |
2006年 | 102篇 |
2005年 | 127篇 |
2004年 | 116篇 |
2003年 | 110篇 |
2002年 | 118篇 |
2001年 | 93篇 |
2000年 | 83篇 |
1999年 | 77篇 |
1998年 | 64篇 |
1997年 | 56篇 |
1996年 | 62篇 |
1995年 | 53篇 |
1994年 | 67篇 |
1993年 | 44篇 |
1992年 | 69篇 |
1991年 | 67篇 |
1990年 | 49篇 |
1989年 | 70篇 |
1988年 | 74篇 |
1987年 | 62篇 |
1986年 | 44篇 |
1985年 | 54篇 |
1984年 | 41篇 |
1983年 | 38篇 |
1982年 | 28篇 |
1981年 | 22篇 |
1980年 | 28篇 |
1979年 | 31篇 |
1978年 | 37篇 |
1977年 | 19篇 |
1976年 | 24篇 |
1975年 | 19篇 |
1973年 | 23篇 |
1972年 | 17篇 |
1969年 | 21篇 |
排序方式: 共有3384条查询结果,搜索用时 15 毫秒
1.
2.
3.
W W Eaton A Romanoski J C Anthony G Nestadt 《The Journal of nervous and mental disease》1991,179(11):689-693
This analysis applies methods of screening to the problem of psychosis. A probability sample of 810 individuals from the Eastern Baltimore Mental Health Survey was interviewed in the self-report modality with the Diagnostic Interview Schedule and shortly thereafter by a psychiatrist. It is shown that a configuration of responses in the self-report modality can screen moderately well for psychosis, as measured by psychiatrists in the clinical modality. 相似文献
4.
5.
K.A. Eaton F.M. Rimini E. Zak D.J. Brookman L.M.A. Hopkins P. J. Carmell LG. Yates C. A. Morrice B.A. Lall H. N. Newman 《Journal of clinical periodontology》1997,24(3):189-197
Abstract Several previous studies have evaluated the effects of 0.12% chlorhexidine digluconate (ChD) mouthrinses on plaque and gingival inflammation. However, previously, none have been based in general dental practices. The aim of this study was to evaluate the potential to conduct controlled periodontal clinical trials in co-operation with general dental practitioners (gdps). The project took place in 5 general dental practices in the South of England. 121 healthy subjects (24 at 4 sites and 25 at the 5th). aged 18-65 years, mean 35 ± 12) years participated in a double-blind, randomised study during which they received full mouth assessments for plaque and gingival bleeding at baseline, 6 and 12 weeks. 60 subjects were randomly asigned to use the 0.12% ChD mouth wash and 6i the placebo. The assessments were carried out by 5 gpds, who had previously achieved inter-examiner κ scores of 0.78–0.85 (mean 0.81) for the plaque index (PlI), and of 0.73–0.94 (mean 0.87) for a modified gingival index (mGI), and who maintained κ scores of 0.51–0.90 for PII and of 0.73–1.00 for mGI during the 12 months required to complete the study. 98 subjects (48 ChD and 50 placebo) completed the study. Even though the baseline levels of plaque and gingivitis were low, by week 12, mean whole mouth piaque score of the ChD mouthwash users had fallen from 1.33 at baseline to 0.96 and was significantly lower (p < 0.001) than for the placebo users, 1.31 at baseline to 1.13. Whole-mouth gingival bleeding score fell from 0.56 to 0.42 in the ChD mouthwash group but was unchanged (0.54–0.55) in the placebo group. A subsidiary data analysis which considered the effects at sites indicated that within these overall differences, the ChD users experienced almost 2× the reduction from plaque score 2 at baseline at proximal molar sites over a 12-week period (50.6% ChD versus 27.6% placebo). It was concluded that 0.12% ChD mouthwash reduced plaque accumulation fay 28% and gingival inflammation by 25% over a 12–week period, that it is feasible for a group of gdps to maintain high levels of inter–examiner consistency in the use of PlI and mGI, that it is also feasible to carry out such a multicentre study in general dental practice, and that the use of mean mouth scores per subject to analyse the effects of mouthrinses may well mask variations in response throughout the mouth. 相似文献
6.
7.
8.
SUMMARY A case congenital dislocation of both knees and dislocation of the left hip in an infant whose mother had a chronic amniotic fluid leakage after mid-trimester amniocentesis. 相似文献
9.
Dr. Andrew G. Bostom M.D. Dr. Anne L. Hume Pharm.D. Dr. Charles B. Eaton M.D. Dr. Joseph P. Laurino Ph.D. Ms. Lisa R. Yanek B.A. Ms. Mary S. Regan B.S. Mr. William H. McQuade M.P.H. Dr. Wendy Y. Craig Ph.D. Ms. Gayle Perrone M.B.A. Dr. Paul F. Jacques Sc.D. 《Pharmacotherapy》1995,15(4):458-464
Study Objective . To determine the efficacy of high-dose ascorbate supplementation in lowering lipoprotein(a) [Lp(a)] levels in patients with premature coronary heart disease (CHD). Design . Randomized, double-blind, placebo-controlled trial. Setting . Outpatient clinic. Patients . Forty-four patients with documented premature CHD. defined as confirmed myocardial infarction and/or angiographically determined stenosis of 50% or greater in at least one major coronary artery before age 60 years. Interventions . Patients were block randomized on the basis of age, gender, and screening Lp(a) concentrations to receive ascorbate 4.5 g/day or placebo for 12 weeks. Measurements and Main Results . High-dose ascorbate was well tolerated and produced a marked elevation in mean plasma ascorbate levels (+1.2 mg/dl; p<0.001). Multiple linear regression analysis revealed no significant effect of supplementation on postintervention Lp(a) levels (p=0.39) in a model that included treatment group assignment, and baseline Lp(a) levels. Conclusions . Our findings do not support a clinically important lowering effect of high-dose ascorbate on plasma Lp(a) in patients with premature CHD. 相似文献
10.