全文获取类型
收费全文 | 3186篇 |
免费 | 506篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 98篇 |
妇产科学 | 314篇 |
基础医学 | 310篇 |
口腔科学 | 52篇 |
临床医学 | 1005篇 |
内科学 | 690篇 |
皮肤病学 | 75篇 |
神经病学 | 122篇 |
特种医学 | 270篇 |
外科学 | 204篇 |
综合类 | 95篇 |
一般理论 | 2篇 |
预防医学 | 203篇 |
眼科学 | 24篇 |
药学 | 131篇 |
中国医学 | 3篇 |
肿瘤学 | 93篇 |
出版年
2023年 | 50篇 |
2021年 | 19篇 |
2020年 | 42篇 |
2019年 | 32篇 |
2018年 | 79篇 |
2017年 | 102篇 |
2016年 | 91篇 |
2015年 | 111篇 |
2014年 | 120篇 |
2013年 | 146篇 |
2012年 | 85篇 |
2011年 | 113篇 |
2010年 | 129篇 |
2009年 | 131篇 |
2008年 | 98篇 |
2007年 | 115篇 |
2006年 | 93篇 |
2005年 | 86篇 |
2004年 | 95篇 |
2003年 | 100篇 |
2002年 | 79篇 |
2001年 | 84篇 |
2000年 | 71篇 |
1999年 | 105篇 |
1998年 | 119篇 |
1997年 | 131篇 |
1996年 | 125篇 |
1995年 | 109篇 |
1994年 | 79篇 |
1993年 | 65篇 |
1992年 | 51篇 |
1991年 | 65篇 |
1990年 | 51篇 |
1989年 | 73篇 |
1988年 | 59篇 |
1987年 | 39篇 |
1986年 | 49篇 |
1985年 | 65篇 |
1984年 | 48篇 |
1983年 | 36篇 |
1982年 | 25篇 |
1981年 | 30篇 |
1980年 | 24篇 |
1979年 | 19篇 |
1978年 | 27篇 |
1977年 | 24篇 |
1976年 | 33篇 |
1975年 | 22篇 |
1974年 | 15篇 |
1973年 | 16篇 |
排序方式: 共有3718条查询结果,搜索用时 15 毫秒
11.
The aetiopathogenesis of haemorrhagic shock encephalopathy syndrome (HSES) remains unclear and after concern that a novel environmental agent was the cause, the British Paediatric Association and the Public Health Laboratory Service Communicable Disease Surveillance Centre in 1983 initiated surveillance of this condition in the British Isles. After 1986 cases were ascertained via the British Paediatric Surveillance Unit 'active' reporting scheme; this report presents the findings for 1985-8. Sixty five patients were reported, of whom 52 satisfied the criteria for inclusion. Of those whose outcome was known, 24 (46%) died, 18 had severe neurological damage, and six survived apparently intact. Epidemiological features of note were: the median age of 15 weeks (range 3-140); statistically significant clustering of admission times suggesting a peak onset period at night; lack of geographic clusters, of secular trends and, except for a slight excess in winter months, of seasonality. Clinical and pathological features followed a highly consistent pattern, suggesting that HSES is an individual clinical entity distinguishable from conditions with similar presentations, such as septicaemia and Reye's syndrome. There was no microbiological or epidemiological evidence to support the emergence of a novel environmental agent. Many of the features of HSES were, however, the same as those described in heat stroke and we suggest that the two conditions are the same even though there is usually no history of overt overheating. 相似文献
12.
M W Robinson D G Scott P A Bacon K W Walton J S Coppock D L Scott 《Annals of the rheumatic diseases》1989,48(6):496-501
The proteins present in 4% polyethylene glycol (PEG) precipitates of 10 normal sera and 60 samples from patients with rheumatic diseases were studied. A variety of immunochemical methods were used, including estimation of the percentages of total serum proteins precipitated by PEG, gel filtration analyses of the precipitates, and affinity chromatography with protein A and anti-immunoglobulin columns. Substantial amounts of protein were precipitated from normal sera. Many non-immunoglobulin proteins were precipitated from patients' sera, including fibronectin, haptoglobin, albumin, transferrin, and alpha 1-antitrypsin. Affinity chromatography with anti-immunoglobulin columns bound non-immunoglobulin proteins from PEG precipitates, but the protein A affinity column did not do so. The view that circulating antibody-antigen complexes alone are precipitated by 4% PEG is too simplistic; many non-immunoglobulin proteins are involved. They may either bind to immune complexes or be coprecipitated owing to non-specific protein aggregation. 相似文献
13.
M.M. Bialoskurski MA RN RM C.L. Cox MSc PhD RN & R.D. Wiggins PhD 《Journal of advanced nursing》2002,37(1):62-69
AIM: The aim of this study was to investigate the nature and organization of maternal needs and priorities in a neonatal unit. BACKGROUND: The relationship between maternal needs and priorities appears to be an under studied area in neonatal nursing. METHODS: A quantitative survey was carried out based on 209 mothers with premature infants. Two self-assessment schedules were used: critical care maternal needs inventory (J. Leske, Heart and Lung 15, 27-42) and a ranking scale. The data were analysed with multivariate analysis. FINDINGS: Data analysis revealed clear priorities in maternal needs. In particular the need for accurate infant related information was a priority for 93% of the mothers. Good communication practices with professionals were also valued. The mothers displayed altruistic behaviour, and self-related needs took second place. It is proposed that maternal needs demonstrate a hierarchical organization. CONCLUSION: It is important for nurses to consider the individual needs of the mothers, simply because the satisfaction of these needs is essential for maternal well-being. 相似文献
14.
15.
16.
Sally J Wellard RN BA Renal Cert MN Colleen Rolls RN RM Child Hlth Cert BAppSc Grad Dip Child Development MEdSt de Sales Ferguson RN BA BEd MN 《Journal of advanced nursing》1995,21(4):737-742
An Australian school of nursing's attempt to introduce an evaluation process required by management for clinical educators involved in undergraduate preregistration education is discussed Reliance on student feedback and clinical agencies' perceptions of the quality of teaching were seen as inadequate mechanisms for evaluation The evaluation process adopted incorporated observation of the educators together with self-reflection on their performance We conclude that post-briefings were poorly used and generally not reflective Educators relied heavily on their clinical skills and used a limited range of teaching strategies Whilst evaluation of clinical educators was time consuming and therefore costly, it is argued that it is essential to the integrity of the course The evaluation process has provided direction for support and development of clinical educators within the context of the curriculum 相似文献
17.
18.
Susan Kirk MSc BNurs RGN RM RHV DNCert Caroline Carlisle MSc BA RGN RM DNCert DipCouns RNT Karen A. Luker PhD BNurs RGN RHV DNCert 《Journal of advanced nursing》1997,26(5):1036-1044
A national study was conducted between 1991 and 1994 to explore and describe the changing role of the nurse teacher following the introduction of Project 2000 pre-registration nursing courses. Multiple methods were used to collect data from a wide variety of respondents (nurse teachers, midwife teachers, clinical nurses, health service managers and higher education lecturers). This paper presents the findings relating to the impact of Project 2000 and the move into higher education on the continuing educational needs of nurse teachers. Views on college strategies for staff development, the changing nature of teachers'academic and professional development needs and the problems of the conflicting demands experienced are reported. The research highlights the need for clinical credibility to be clearly defined in relation to nurse teachers and for educational institutions to place more emphasis on teachers'clinical development if the rhetoric of policy is to become a reality. 相似文献
19.
MIA SON JEONG‐OK KONG SANG‐BAEK KOH JAEYOUNG KIM MIKKO HÄRMÄ 《Journal of sleep research》2008,17(4):385-394
We investigated the effects of 12‐hour shift work for five to seven consecutive days and overtime on the prevalence of severe sleepiness in the automobile industry in Korea. [Correction added after online publication 28 Nov: Opening sentence of the summary has been rephrased for better clarity.] A total of 288 randomly selected male workers from two automobile factories were selected and investigated using questionnaires and sleep‐wake diaries in South Korea. The prevalence of severe sleepiness at work [i.e. Karolinska Sleepiness Scale (KSS) score of 7 or higher] was modeled using marginal logistic regression and included theoretical risk factors related to working hours and potential confounding factors related to socio‐economic status, work demands, and health behaviors. Factors related to working hours increased the risk for severe sleepiness at the end of the shift in the following order: the night shift [odds ratio (OR): 4.7; 95% confidence interval (CI): 3.6–6.0)], daily overtime (OR: 2.2; 95% CI: 1.7–2.9), weekly overtime (OR: 1.6; 95% CI: 1.0–2.6), and night overtime (OR: 1.6; 95% CI: 0.8–3.0). Long working hours and shift work had a significant interactive effect for severe sleepiness at work. Night shift workers who worked for 12 h or more a day were exposed to a risk of severe sleepiness that was 7.5 times greater than day shift workers who worked less than 11 h. Night shifts and long working hours were the main risk factors for severe sleepiness among automobile factory workers in Korea. Night shifts and long working hours have a high degree of interactive effects resulting in severe sleepiness at work, which highlight the need for immediate measures to address these characteristics among South Korean labor force patterns. 相似文献
20.
Adenosine and active hyperemia in dog skeletal muscle 总被引:5,自引:0,他引:5