全文获取类型
收费全文 | 2408488篇 |
免费 | 197464篇 |
国内免费 | 4342篇 |
专业分类
耳鼻咽喉 | 34688篇 |
儿科学 | 73581篇 |
妇产科学 | 63491篇 |
基础医学 | 338997篇 |
口腔科学 | 68185篇 |
临床医学 | 219306篇 |
内科学 | 474769篇 |
皮肤病学 | 48644篇 |
神经病学 | 203920篇 |
特种医学 | 97242篇 |
外国民族医学 | 887篇 |
外科学 | 365946篇 |
综合类 | 56849篇 |
现状与发展 | 2篇 |
一般理论 | 1007篇 |
预防医学 | 193522篇 |
眼科学 | 56258篇 |
药学 | 180009篇 |
5篇 | |
中国医学 | 4424篇 |
肿瘤学 | 128562篇 |
出版年
2018年 | 25190篇 |
2017年 | 19536篇 |
2016年 | 21310篇 |
2015年 | 24152篇 |
2014年 | 34801篇 |
2013年 | 52495篇 |
2012年 | 71183篇 |
2011年 | 74966篇 |
2010年 | 43981篇 |
2009年 | 42158篇 |
2008年 | 70939篇 |
2007年 | 75557篇 |
2006年 | 76363篇 |
2005年 | 74250篇 |
2004年 | 71305篇 |
2003年 | 69013篇 |
2002年 | 67975篇 |
2001年 | 112737篇 |
2000年 | 116735篇 |
1999年 | 98616篇 |
1998年 | 28213篇 |
1997年 | 25777篇 |
1996年 | 25666篇 |
1995年 | 24824篇 |
1994年 | 23330篇 |
1993年 | 21716篇 |
1992年 | 79519篇 |
1991年 | 76527篇 |
1990年 | 73693篇 |
1989年 | 70967篇 |
1988年 | 65983篇 |
1987年 | 64907篇 |
1986年 | 61422篇 |
1985年 | 58509篇 |
1984年 | 44352篇 |
1983年 | 37776篇 |
1982年 | 23031篇 |
1981年 | 20437篇 |
1980年 | 19162篇 |
1979年 | 41386篇 |
1978年 | 29065篇 |
1977年 | 24407篇 |
1976年 | 22896篇 |
1975年 | 24027篇 |
1974年 | 29688篇 |
1973年 | 28083篇 |
1972年 | 26265篇 |
1971年 | 24171篇 |
1970年 | 22775篇 |
1969年 | 21110篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
83.
Michiel R. de Boer Jos Twisk Annette C. Moll Hennie J. M. Völker-Dieben Henrica C. W. de Vet Ger H. M. B. van Rens 《Ophthalmic & physiological optics》2006,26(6):535-544
Consecutive patients (n = 215) who were referred to optometric (55%) or multidisciplinary (45%) low-vision services and above 50 years of age were recruited from four hospitals in the Netherlands. They completed two vision-related quality of life questionnaires, the Vision Quality of Life Core Measure (VCM1) and the Low Vision Quality of Life Questionnaire (LVQOL), before their first visit with low-vision services and 1 year later. At follow-up, patients referred to multidisciplinary low-vision services had lower scores on the mobility subscale of the LVQOL than patients referred to optometric low-vision services [5.3 points; 95% confidence interval (CI): 0.2-10.5]. Paired sample t-tests for the two groups of patients taken together show improvement for the VCM1 (3.1 points; 95% CI: 0.6-5.6) and deterioration for the basic aspects of vision (3.5 points; 95% CI: 1.1-5.9) and the mobility (6.6 points; 95% CI: 3.7-9.5) subscales of the LVQOL. In conclusion, people referred to optometric services showed less deterioration in mobility than those referred to multidisciplinary services. No differences were observed for any of the other subscales of the LVQOL and the VCM1. Future research in this field should include randomized controlled designs comparing low-vision services with no treatment or placebo. 相似文献
84.
C. O. Onyeaso BDS FWACS M. O. Arowojolu BDS FWACS J. O. Taiwo BDS MSc DDPH RCS Eng 《American journal of orthodontics and dentofacial orthopedics》2003,124(6):714-720
This prospective clinic-based study evaluated the pretreatment periodontal status of the orthodontic patients seen at the University College Hospital, Ibadan, Nigeria, and assessed the relationship between dental aesthetic index (DAI) scores and periodontal status according to community periodontal index of treatment needs (CPITN) scores. One hundred forty five patients-70 (48.3%) males and 75 (51.7%) females from 6 to 45 years (mean 15.8 +/- 7.5)-were seen. World Health Organization (WHO) guidelines were followed in the examination and reporting of the periodontal status, and DAI scores were assessed based on WHO guidelines. The chi-square test was used to determine the association between the DAI and the CPITN scores. Most patients were in the 6-15 (55.9%) or 16-25 (35.9%) age groups. Based on the WHO preferred cumulative calculations of treatment need (TN), 35.2% of the patients had TN 0, 64.9% had TN 1, 24.9% had TN 2, and only 0.7% had TN 3. The relationship between DAI scores and periodontal treatment needs was not statistically significant (P >.05). Although many patients were yet to attain the WHO goal of no more than 1 sextant affected by bleeding or calculus at the age of 15, over one third had satisfactory periodontal health. 相似文献
85.
M. Lenartowicz M. Kowal D. Buda-Lewandowska J. Styrna 《Journal of inherited metabolic disease》2003,25(8):647-659
Summary: The mosaic (Atp7a
mo-ms
) is an X-linked, lethal mutation in mice. In mosaic mutant males, many clinical features characteristic of defective copper metabolism have been observed and they die at the age of 15 days, exhibiting strongsimilarities to the brindled and macular mutants. About 4% of the mutant males live to sexual maturity and some of them are fertile. In this paper, alterationsin the structure of the kidney from adult mutants are described. Owing to an inherited defect of efflux, copper is accumulated in the kidney of the mutants up to a toxic level and this leads to severe damage of the renal cortex. Pathological changes in the kidney mostly affected the structure of the renal corpuscle and renaltubules. 相似文献
86.
Colin J McKay 《World journal of surgery》2006,30(12):2234-2235
87.
B Nkgudi K A Robertson J Volmink B M Mayosi 《Suid-Afrikaanse tydskrif vir geneeskunde》2006,96(3):206-208
OBJECTIVE: To determine whether under-reporting of rheumatic fever occurs at hospital, municipal, provincial and national levels of the South African health system. BACKGROUND: Information on the incidence of rheumatic fever (RF) and the prevalence of rheumatic heart disease (RHD) is required for the prevention of valvular heart disease in developing countries. In South Africa, RF was made a notifiable condition in 1989. It has recently been suggested that the reporting of RF cases may be incomplete, possibly because of underreporting by health care professionals and deficient administration of the disease notification system in South Africa. METHOD AND RESULTS: We assessed whether underreporting of RF cases occurs by comparing the numbers of RF cases reported per year at hospital, municipal, provincial and national levels from 1990 to 2004. There was a fall in the number of RF cases reported per year at national and provincial level over the 15 years of observation. A detailed analysis of the number of RF cases reported at hospital, municipal and provincial level for a 5-year period showed that more cases were diagnosed in one hospital (serving a smaller population) than were captured at municipal and provincial level (serving a larger population), suggesting underreporting by health care professionals. There were discrepancies in the number of cases reported at municipal, provincial and national level, suggesting poor administration of the notification system. CONCLUSION: There appears to be underreporting of RF cases by health care professionals, and poor administration of the RF notification system. Health care professionals need to be educated about the statutory requirement to notify all RF cases in South Africa. An effective national disease notification system is required. 相似文献
88.
89.
90.