全文获取类型
收费全文 | 82572篇 |
免费 | 6634篇 |
国内免费 | 1771篇 |
专业分类
耳鼻咽喉 | 455篇 |
儿科学 | 1675篇 |
妇产科学 | 978篇 |
基础医学 | 7267篇 |
口腔科学 | 1731篇 |
临床医学 | 10056篇 |
内科学 | 10517篇 |
皮肤病学 | 657篇 |
神经病学 | 5254篇 |
特种医学 | 2293篇 |
外国民族医学 | 3篇 |
外科学 | 9155篇 |
综合类 | 11511篇 |
现状与发展 | 5篇 |
一般理论 | 2篇 |
预防医学 | 11349篇 |
眼科学 | 728篇 |
药学 | 7282篇 |
49篇 | |
中国医学 | 6519篇 |
肿瘤学 | 3491篇 |
出版年
2024年 | 181篇 |
2023年 | 1401篇 |
2022年 | 2283篇 |
2021年 | 3160篇 |
2020年 | 2976篇 |
2019年 | 2674篇 |
2018年 | 2671篇 |
2017年 | 2628篇 |
2016年 | 2626篇 |
2015年 | 2567篇 |
2014年 | 5699篇 |
2013年 | 5802篇 |
2012年 | 4903篇 |
2011年 | 5230篇 |
2010年 | 4071篇 |
2009年 | 3860篇 |
2008年 | 4046篇 |
2007年 | 4089篇 |
2006年 | 3758篇 |
2005年 | 3142篇 |
2004年 | 2629篇 |
2003年 | 2407篇 |
2002年 | 1911篇 |
2001年 | 1762篇 |
2000年 | 1546篇 |
1999年 | 1271篇 |
1998年 | 983篇 |
1997年 | 1022篇 |
1996年 | 832篇 |
1995年 | 856篇 |
1994年 | 755篇 |
1993年 | 669篇 |
1992年 | 614篇 |
1991年 | 531篇 |
1990年 | 475篇 |
1989年 | 419篇 |
1988年 | 442篇 |
1987年 | 362篇 |
1986年 | 307篇 |
1985年 | 425篇 |
1984年 | 438篇 |
1983年 | 287篇 |
1982年 | 349篇 |
1981年 | 314篇 |
1980年 | 276篇 |
1979年 | 230篇 |
1978年 | 210篇 |
1977年 | 178篇 |
1976年 | 153篇 |
1975年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Virginija Pokut Rta Kazlauskait Irmina Matonyt 《Health & social care in the community》2022,30(1):193-202
Demographic situation, changes in the role of women in society and growing demand for long-term care (LTC) of older people have challenged the ability to meet the growing LTC needs in most developed countries. In countries where responsibility for LTC is still largely laid on families, it is, however, even more critical and calls for improvements in formal LTC systems. More intensive stakeholder collaboration in LTC policy development, organising and delivery are of primary importance in improving LTC systems. Such collaboration, however, is not always successful; thus, it is critical to understand what makes it effective and efficient. In this paper, we specifically look into multistakeholder collaboration in LTC in Lithuania, one of the fastest ageing countries in the EU, with the demand for LTC services growing fast and exceeding the supply despite rising business and NGO engagement. To determine facilitators of such collaboration, we build on the data obtained through eight focus group discussions with all key stakeholder representatives (LTC policymakers, organisers and service providers [public, private and NGOs], 54 participants in total). Our findings indicate that in addition to national and organisational level facilitators studied in prior research, there are important individual level factors, such as meaningfulness at work, concern and care for others, possibility for personal growth and development, satisfaction with supervision, a sense of belonging and role clarity. On the other hand, our results show that collaboration is constrained by a shortage of human resources, increased workload caused by growing LTC demand, bureaucratic requirements, legal restrictions, lack of awareness of LTC service availability among elder persons, and prevailing social norms and attitudes to institutionalised care. Interestingly, a lack of financial resources is not perceived as a major constraint. 相似文献
2.
3.
4.
5.
This study is focussed on micro-encapsulation of essential oils in polylactic acid (PLA) and a poly(methyl methacrylate) (PMMA) matrix as well as blends of the same. Microspheres were prepared by the solvent evaporation technique and characterised by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infra-red spectroscopy (FTIR). The encapsulation efficiencies and release profiles of the essential oils were studied by gas chromatography mass spectrometry (GC-MS) and head-space solid-phase microextraction GC-MS, respectively. Furthermore, the microspheres were tested for antibacterial activity against both Gram-negative and Gram-positive bacterial strains.
The results showed that the microspheres compositions (PLA/PMMA ratio) have significant effect on their characteristics. The process adopted for preparing the microspheres promoted formation of spherical particles at the sizes of 1.5–9.5?µm. The highest encapsulation efficiency of the prepared microspheres was observed in systems consisting of linalool (81.10?±?10.0?wt. % for PLA system and 76.0?±?3.3?wt. % for PMMA system). Confirmation was also made that the release rate of the microspheres was affected by the size of the same. 相似文献
6.
7.
8.
9.
Sajid Amit Lumbini Barua Abdulla - Al Kafy 《Diabetes & Metabolic Syndrome: Clinical Research & Reviews》2021,15(4):102129
Background and aimsWorldwide the COVID-19 pandemic has accelerated sufferings of mental health and behaviour attitudes of people. Many countries, including Bangladesh, reported suicide as extreme consequences of the psychological burden influenced by COVID-19. The present study explores human stress and its factor influenced by COVID-19 in Bangladesh, which significantly affect the quality of life.MethodsAn online-based questionnaire survey was conducted among 651 adult Bangladeshi populations by capturing socio-demographic information, possible human stress, and consequences of the pandemic. A set of statistical tools such as Pearson's Correlation Matrix (PCM), T-test, Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) were applied to identify the relationship between different factors and influential factors increasing human stress.ResultsMore than 83% of the participants are facing COVID-19 related mental stress, which results in short temper, sleep disorder, and family chaos. PCA and HCA outcomes indicated a significant relationship between the respondents' opinions and human stress factors, which harmonized with the country's existing scenario. PCM results enlighten the relationship between human stress factors and found financial hardship, cutting back daily spending, and food crisis are interconnected together causes stress. Also, hampering students' formal education and future career plans significantly contribute to mental stress.ConclusionBased on the above findings, it's crucial to introduce a time-oriented strategy and implement precaution monitoring plans for Bangladesh. The rescue plan will help people to manage the pandemic and improve mental health to fight against psychological challenges related to COVID-19 and future pandemics. 相似文献
10.
《Diabetes & Metabolic Syndrome: Clinical Research & Reviews》2019,13(2):1329-1334
BackgroundMetabolic syndrome (MetS) is related to the increased risk of major cardiovascular diseases (CVD). The link between high serum total bilirubin (TBL) is cross-sectionally related to MetS and its components. However, whether serum TBL predicts incidence of MetS and its components remains inconclusive.MethodsThe present study included 893 women aged 70 ± 9 years from a rural village. We examined the relationship between serum TBL and MetS based on the modified criteria of the National Cholesterol Education Program's Adult Treatment Panel (NCEP-ATP) III report in a cross-sectional (N = 893) and cohort (N = 288) data.ResultsIn the cross-sectional study, serum TBL (β = 0.536, p < 0.001) as well as age, alcohol consumption, exercise habits, history of CVD, SUA, GGT, and ALT was significantly and dependently associated with number of MetS components, but in the cohort study serum TBL was not associated with number of MetS components. Compared with the 1st tertile of serum TBL (0.20–0.55 mg/dL), multivariate-adjusted odds ratio (95% confidence interval) for the 2nd -3rd tertiles of serum TBL (0.54–2.00 mg/dL) was 0.70 (0.51–0.95) in the cross-sectional study and 0.41 (0.21–0.81) in the cohort study.ConclusionsOur data demonstrated an independently negative association between serum TBL and MetS in Japanese community-dwelling women. 相似文献