全文获取类型
收费全文 | 791篇 |
免费 | 51篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 63篇 |
妇产科学 | 4篇 |
基础医学 | 151篇 |
口腔科学 | 15篇 |
临床医学 | 67篇 |
内科学 | 161篇 |
皮肤病学 | 7篇 |
神经病学 | 16篇 |
特种医学 | 23篇 |
外科学 | 72篇 |
综合类 | 65篇 |
预防医学 | 56篇 |
眼科学 | 26篇 |
药学 | 49篇 |
中国医学 | 4篇 |
肿瘤学 | 67篇 |
出版年
2023年 | 3篇 |
2022年 | 11篇 |
2021年 | 25篇 |
2020年 | 14篇 |
2019年 | 14篇 |
2018年 | 17篇 |
2017年 | 11篇 |
2016年 | 21篇 |
2015年 | 29篇 |
2014年 | 34篇 |
2013年 | 33篇 |
2012年 | 44篇 |
2011年 | 52篇 |
2010年 | 21篇 |
2009年 | 26篇 |
2008年 | 35篇 |
2007年 | 34篇 |
2006年 | 22篇 |
2005年 | 25篇 |
2004年 | 26篇 |
2003年 | 29篇 |
2002年 | 21篇 |
2001年 | 30篇 |
2000年 | 19篇 |
1999年 | 12篇 |
1998年 | 17篇 |
1997年 | 18篇 |
1996年 | 18篇 |
1995年 | 8篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 24篇 |
1991年 | 16篇 |
1990年 | 19篇 |
1989年 | 15篇 |
1988年 | 22篇 |
1987年 | 11篇 |
1986年 | 6篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 4篇 |
1971年 | 2篇 |
排序方式: 共有847条查询结果,搜索用时 15 毫秒
841.
842.
Neuroimaging studies investigating the neural network of visuospatial processing have revealed a right hemisphere network of activation including inferior parietal lobe, dorsolateral prefrontal cortex, and extrastriate regions. Impaired visuospatial processing, indicated by the Judgment of Line Orientation (JLO), is commonly seen in individuals with neurofibromatosis type 1 (NF-1). Nevertheless, few studies have examined the neural activity associated with visuospatial processing in NF-1, in particular, during a JLO task. This study used functional neuroimaging to explore differences in volume of activation in predefined regions of interest between 13 individuals with NF-1 and 13 controls while performing an analogue JLO task. We hypothesized that participants with NF-1 would show anomalous right hemisphere activation and therefore would recruit regions within the left hemisphere to complete the task. Multivariate analyses of variance were used to test for differences between groups in frontal, temporal, parietal, and occipital regions. Results indicate that, as predicted, controls utilized various right hemisphere regions to complete the task, while the NF-1 group tended to recruit left hemisphere regions. These results suggest that the NF-1 group has an inefficient right hemisphere network. An additional unexpected finding was that the NF-1 group showed decreased volume of activation in primary visual cortex (BA 17). Future studies are needed to examine whether the decrease in primary visual cortex is related to a deficit in basic visual processing; findings could ultimately lead to a greater understanding of the nature of deficits in NF-1 and have implications for remediation. 相似文献
843.
Sumeet Gairola Jyotsana Sharma R.D. Gaur T.O. Siddiqi R.M. Painuli 《Journal of ethnopharmacology》2013
Ethnopharmacological relevance
Dysentery and diarrhoea are major causes of morbidity and mortality in rural communities of developing world. The Bhoxa community is an important primitive indigenous community of Uttarakhand, India. In this paper we have tried to scientifically enumerate ethnomedicinal plants and herbal preparations used by Bhoxa community to treat dysentery and diarrhoea, and discuss their antidiarrhoeal properties in the light of previous ethnomedicinal, pharmacological, microbiological and phytochemical studies. To record plants and herbal preparations used by Bhoxa community of district Dehradun, Uttarakhand, India in treatment of dysentery and diarrhoea, and to discuss antidiarrhoeal and antimicrobial properties of the recorded plants.Materials and methods
Ethnomedicinal survey was conducted in different villages of Bhoxa community located in district Dehradun, Uttarakhand, India. Thirty Bhoxa traditional healers were interviewed to collect information on plants used by them for treating dysentery and diarrhoea. For each of the recorded plant species the use value (UV) and fidelity level (FL) was calculated. Detailed literature survey was conducted to summarize ethnomedicinal, pharmacological, microbiological and phytochemical information on the medicinal plants listed in the present study.Results
Fifty medicinal plants (45 genera and 30 families) were used by Bhoxa community to treat dysentery and diarrhoea, among which 27 species were used for dysentery, 41 for diarrhoea and 18 for both dysentery and diarrhoea. Three plants viz., Dioscorea bulbifera L., Euphorbia thymifolia L. and Prunus persica (L.) Stokes, recorded in the present survey have been reported for the first time in treatment of dysentery and diarrhoea by any indigenous communities in India. FL and UV values revealed that most preferred species for the treatment of dysentery and diarrhoea by Bhoxa community are Euphorbia hirta L. followed by Holarrhena pubescens Wall., Helicteres isora L. and Cassia fistula L. Earlier pharmacological studies confirmed that 27 of the recorded plants have some proven antidiarrhoeal properties and remaining 23 plants have to be pharmacologically evaluated for their antidiarrhoeal properties. Except 6 plants all the other recorded plants have shown antimicrobial properties in previous microbiological studies. Previous studies have corroborated the ethnomedicinal claims made by the traditional healers of the Bhoxa community.Conclusions
Present study has provided new information on many medicinal plants and their uses. All the three newly reported plants for treatment of dysentery and diarrhoea have not been pharmacologically evaluated yet for their possible antidiarrhoeal properties. Twenty-three and six plants have not been evaluated pharmacologically and microbiologically, respectively. The present information may serve as a baseline data to initiate further research for discovery of new compounds and biological activities of these potential plants. Further research on these plants may provide some important clues for development of new drugs for dysentery and diarrhoea or other related diseases. 相似文献844.
Akshay Gaur Shivam Dubey Zainab Mufarreh Elqahtani Samia ben Ahmed Mohammed Sultan Abdulghaffar Al-Buriahi Rahul Vaish Vishal Singh Chauhan 《Materials》2022,15(22)
Ferroelectric materials with a spontaneous polarization are proven to be potential multicatalysts in water remediation applications. The composition of 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Sr0.3)TiO3 (BST-BZT) was examined for photocatalysis, piezocatalysis, and piezo-photocatalysis processes by degrading an azo dye named methylene blue (MB). Generally, dis-aligned dipoles restrict the catalytic activities due to which the BST-BZT powder sample was poled by the corona poling technique. Coupled piezocatalysis and photocatalysis process, i.e., the piezo-photocatalysis process has shown maximum dye degradation. There was a significant improvement in degradation efficiency by using a poled BST-BZT sample compared to the unpoled sample in all processes, thus the results suggest an extensive scope of poled ferroelectric ceramic powder in the catalysis field. 相似文献
845.
Andrea S. Kierans MD Kyle J. Lafata PhD Daniel R. Ludwig MD Lauren M. B. Burke MD Victoria Chernyak MD MS Kathryn J. Fowler MD Tyler J. Fraum MD Katrina A. McGinty MD Matthew D. F. McInnes MD PhD Mishal Mendiratta-Lala MD Guilherme Moura Cunha MD Brian C. Allen MD Elizabeth M. Hecht MD Tracy A. Jaffe MD Kevin R. Kalisz MD Damithri S. Ranathunga MD Benjamin Wildman-Tobriner MD Diana M. Cardona MD Anum Aslam MD Sonia Gaur MD Mustafa R. Bashir MD 《Journal of magnetic resonance imaging : JMRI》2023,57(1):308-317
846.
847.
Sanjiv Jasuja Maurizio Gallieni Vivekanand Jha Tushar Vachharajani A. K. Bhalla Jackson Tan Cheih Suai Tan Nabin Bahadur Basnet Nalaka Herath Ha Phan Hai An Yong Soo Kim Yaeni Kim Krishnaswamy SampathKumar Manisha Sahay Raja Ramachandran Suceena Alexander Vinant Bhargava J. Balasubramaniam David Voss Fredeick E. Ogbac Atma Gunawan Bak Leong Goh Chih-Ching Lin Jamshaid Khan Ibrahim Shiham Haroon Ayub Min Aung Hein Sarwar Iqbal Nattachai Srisawat Bihu Gao Cherian Sajiv Catherine Wilkinson Thim Pichthida D. S. Rana Gaurav Sagar Anupam Bahl Samir Tawakley Mragank Gaur 《Nephrology (Carlton, Vic.)》2023,28(12):672-681