1,576 research outputs found
Identifications of polyphenols and quantification of anthocyanidins in grapes and grape-derived products
No full textPolyphenols in grapes and grape-derived products have attracted public and scientific attention due to their numerous protective roles to human health. A rapid and comprehensive qualitative method was developed to characterize the different classes of polyphenols, such as anthocyanins, flavonols, phenolic acids and flavanols/proanthocyanidins, in grapes and grape-derived products. The detection was achieved by two runs with same HPLC gradient in different MS ionization modes and mobile phase modifiers (positive mode and 0.4% trifluoroacetic acid for anthocyanins and flavonols, negative mode and 0.1% formic acid for phenolic acids and flavanols). Under the optimized LC/MS conditions and based on the analysis of the MS and UV data and in comparison with the authenticated standards, a total of 53 polyphenolic compounds were successfully separated and individually identified including 33 anthocyanins, 12 flavonols, 4 phenolic acids and 4 flavanols/proanthocyanidins. With the method developed, a survey was conducted to qualitatively assess and compare the composition of polyphenols among 29 grapes and grape-derived products. To facilitate the quantitation of the major class of polyphenolic anthocyanidins, a simple and precise acid assisted hydrolysis method was established for the quantitation of anthocyanidins in grape juice samples, grape berries and grape skins using LC/MS. Five most common anthocyanidins of delphenidin, petunidin, cyanidin, malvidin, and peonidin in the hydrolyzed grape extracts were included in the quantification study. The validation of this method showed that the recovery percentages of five anthocyanidins ranged from 98.59 % to 103.20% with the relative standard deviation (RSD) less than 5.03%. The qualitative method provided complete insight into the composition of polyphenols in grapes, and other grape-derived products. This quantitative method provides a rapid and accurate tool to quantitatively study individual anthocyanidin in grapes or grape juice samples for quality control and to facilitate the evaluation and comparison of new commercial grapes or grape juice products in market.M.S.Includes bibliographical referencesby Yanping X
The effect of explicit instruction on the acquisition of grammatical structures in the Chinese context.
No full textby Zhou Yanping.Thesis (M.Phil.)--Chinese University of Hong Kong, 1989.Bibliography: leaves 151-156
Fig. 6 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 6. (a) A labeled diagram of a fullbloom Lilium 'Siberia' flower. (b) Pictorial view of Lilium 'Siberia' flowers at different flower developmental stages.Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 7, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
A longitudinal-experimental test of the panculturality of self-enhancement: self-enhancement promotes psychological well-being both in the west and the east
No full textIntensely debated is whether the self-enhancement motive is culturally relative or universal. The universalist perspective predicts that satisfaction of the motive panculturally promotes psychological well-being. The relativistic perspective predicts that such promotive effects are restricted to Western culture. A longitudinal-randomized-experiment conducted in China and the US tested the competing predictions. Participants completed measures of psychological well-being in an initial session. A week later participants listed a personally important attribute, described (via random assignment) how that attribute is more (self-enhancement) or less (self-effacement) descriptive of self than others, and again reported their psychological well-being. Consistent with the universalist perspective, self-enhancement significantly increased psychological well-being from baseline in the US and China; self-effacement yielded no change in psychological well-being in either culture
Influence of fillers dispersion on friction and wear performance of solution styrene butadiene rubber composites
No full textDevelopment of structure-properties relationships between the fillers/rubber matrix interface chemistry and the dispersion and interfacial adhesion properties of the rubber composites is critical to predict their bulk mechanical and tribological properties. In this paper, three solution styrene butadiene rubber (SSBR) composites containing various fillers with tailored interfacial chemistry were prepared via conventional mixing technique. Subsequently, thermal and structural features of filled SSBR composites were monitored by TG, DSC, XRD, XPS, FESEM and TEM, respectively. Sliding contact experiments were conducted to study tribological properties of styrene butadiene rubber composites under dry and wet conditions. It was shown that the SSBR filled with silicon dioxide nanoparticles significantly reduced both the friction coefficient and the wear against marble block. On the contrary, it exhibited an increased friction coefficient and wear under wet friction conditions due to the specific superior wet-skid resistance of silicon dioxide nanopartilce filled rubber composites, a good dispersion of silicon dioxide nanopartilce in the rubber matrix and strong interfacial adhesion between nanoparticles and rubber matrix. In addition, the influence of fillers dispersion and interfacial adhesion on friction and wear of styrene butadiene rubber composites was evaluated employing theoretical calculation, and the predicted results were in agreement with the experimental observations. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43589
The evolution of the Han wedding dress design research and innovation / Gu Yanping and Rose Dahlina Rusli
No full textChina's long history has given birth to a colorful folk culture, and weddings are a significant part of life. The Chinese often use the term "married" to describe one's marital status, and wedding attire plays a crucial role in this cultural expression. Particularly in China’s dominant ethnic group, the Han, wedding dress traditions are something people pay great attention to. This article explores the evolution of Han wedding attire, detailing how it has changed since the Zhou Dynasty, up through the reforms and opening to the outside world. Throughout the dynasties, Han wedding dresses have exhibited unique characteristics and differences. With the economic, political, and cultural developments during the early Republic era, the grand and solemn traditional wedding dress gradually became westernized. However, Han Chinese traditional wedding attire remains a living cultural symbol, embodying the unique, beautiful, and mysterious essence of ancient Oriental culture, and representing the Han nationality. In designing modern Han wedding dresses, it is important to create designs that are aligned with contemporary trends while preserving the distinct characteristics of Han culture. By incorporating elements from different dynasties, such as traditional patterns, colors, fabrics, and shapes, alongside modern techniques and some western influences, innovation in Han wedding dress design can be achieved. Furthermore, through combining this research with personal innovation design practices, we can continue to inherit and carry forward the tradition of Han wedding attire, making a lasting contribution to its preservation
Fig. 2 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 2. GC-MS analysis of products generated by LoTPS2. (a) GC-MS analysis (total ion chromatogram) of the products obtained by incubating extracts of the empty vector (control) with geranyl pyrophosphate. (b) GC-MS analysis (total ion chromatogram) of the LoTPS2 enzyme with GPP. (c) GC–MS analysis (total ion chromatogram) of the LoTPS2 enzyme with farnesyl pyrophosphate showing (E, E)-α- farnesene as the sole product. (d) Mass spectrum of the peak. (e) Mass spectrum of (E, E)-α-farnesene in the NIST08 library.Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 4, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
Fig. 4 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 4. Product analysis of LoTPS4 produced from GGPP and FPP. (a) GC-MS analysis (ion chromatogram) of the LoTPS4 enzyme product from GGPP. (b) GC-MS analysis (ion chromatogram) of products obtained from assays with LoTPS4 and FPP. (c, d, e, f) Mass spectra of Peak 1, Peak 2, Peak 3 and Peak 4. Di-epi-α-cedrene (Peak 1), α-cubebene (Peak 2): trans-α-bergamotene (Peak 3) and (E)-β-farnesene (Peak 4).Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 6, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
Multiscale asymptotic method for Steklov eigenvalue equations in composite media
No full textAuthor name used in this publication: Yanping Lin2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Developing finite element methods for maxwell's equations in a cole-cole dispersive medium
No full textAuthor name used in this publication: Yanping Lin2011-2012 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
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