检索结果-南通市图书馆

Effects of structural barriers on digestive properties of highland barley as compared with unpolished rice and oats

在线全文

学校读者我要写书评

暂无评论

food Bioscience 2022年第6期50卷 834-841页

作者： Xiaoyu Chen Hui Zhang Ling Zhu Gangcheng Wu Lilin Cheng Jinxin Li National Engineering Research Center for Functional food Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu ProvinceSchool of Food Science and TechnologyJiangnan UniversityWuxi214122China college of food Science and Technology Henan Agricultural UniversityZhengzhou450002HenanChina

Highland barley (HB), oats, and unpolished rice (UR) are known to inhibit starch digestion. β-Glucan and structural barriers are the main factors contributing to low digestibility;however, the hypoglycaemic mechanism of these grains is still unclear. Here, food systems in the forms of flour and chymes were constructed to understand their roles. There was little difference in starch digestibility for the flours of the various grains. We speculated that β-glucan in flours could not delay digestion, and the low viscosity of gelatinised HB flour supported this hypothesis. The digestibility of chymes was lower than flours, especially for HB chyme. After cooking, more bran structures and granular starch were still observed in the HB kernels. The digested grain structure showed that the starch hydrolysis level of UR and oats was higher than that of HB. Also, the starches in the bran encapsulated exhibited a good ability of anti-hydrolysis than those in the exposed endosperm. These results all indicate that intact physical structures effectively hindered gelatinisation and digestion. This study demonstrates that structural barriers exert a more important effect on starch bioaccessibility than β-glucan, which can provide useful guidance for glycaemia management.

关键词： β-Glucan Bran layer Cell walls Intact kernel structure Starch gelatinisation Starch digestion

Structural modification of BODIPY: Improve its applicability

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第10期30卷 1815-1824页

作者： Mengdi Liu Siyue Ma Mengyao She Jiao Chen Zhaohui Wang Ping Liu Shengyong Zhang Jianli Li Ministry of Education Key Laboratory of Synthetic and Natural Functional Molecule Chemistry College of Chemistry & Materials Science Northwest University

BODIPY has been considered a potential scaffold because of their neutral total charge, sharp absorption,and emission with high fluorescence quantum yield. However, the drawback of emission wavelength at less than 600 nm and hydrophobicity limit its application. One of the extremely interesting properties of BODIPY is that small modifications to their structures could be able to tune their properties, mainly including the absorption/emission wavelength and the hydrophilicity. This review focuses on the modification at different positions of BODIPY to improve the water-solubility and emission wavelength that describe their spectral, photophysical properties and applicability, which is helpful for the researchers to rationally design BODIPY dyes to adapt a wide range of applications.

关键词： BODIPY Near-infrared Water solubility Modification Application

Synthesis and Characterization of Nickel(II) Complex Bearing 2,9-di-tert-butyl-1,10-phenanthroline Ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2014年第2期33卷 189-192页

作者：贾卫国赵成安马李亚盛恩宏 college of Chemistry and materials Science Center for Nano Science and Technology The Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Laboratory of Molecular-based Materials Anhui Normal University

The complex DtbpNiCl2（Dtbp = 2,9-di-tert-butyl-1,10-phenanthroline） was synthe- sized and characterized by X-ray single-crystal structure analysis. For the complex： C20 H24 Cl2 N2 Ni CH2 Cl2, Mr = 506.95, monoclinic, space group P21 /c, a = 9.5905（3）, b = 13.7587（3）, c = 17.3364（5）, β = 94.244（2）°, V = 2281.31（11）3, Z = 4, Dc = 1.476 g/cm3, λ = 1.54184, μ = 5.606 mm-1, F（000） = 1048, S = 1.079, R = 0.0402 and wR = 0.1010 for 3223 observed reflections with I 〉 2σ（I）. In complex DtbpNiCl2, the nickel adopts a distorted tetrahedral geometry coordinated by two nitrogen atoms of Dtbp and two chlorine ions. The complex is connected by intermolecular C–H…Cl hydrogen bonds to form a 1D structure in the solid state.

关键词： nickel complex crystal structure hydrogen bonds

Adsorptions and diffusions of carbon atoms on the surface and in the subsurface of Co(200): A first-principles density-functional study

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第8期23卷 75-80页

作者：乔靓王淑敏张晓明胡小颖曾毅郑伟涛 college of materials Science and Engineering Jilin University college of Science Changchun University State Key Laboratory of Theoretical and Computational Chemistry Jilin University Light Industry college Liaoning University

First-principles calculations based on density functional theory are used to investigate the adsorptions and diffusions of carbon atoms on the surface and in the subsurface of Co （200）. The preferred site for the carbon atom on the surface is the hollow site, and the preferred site in the subsurface is the octahedral site. There is charge transfer from the surface to the adsorbed carbon atom, and for the most favorable adsorbed structure the charge transfer is largest. Moreover, the energy barriers for the diffusions of carbon atoms on the surface and from the surface into the subsurface and then back to the surface are calculated in detail. The results indicate that the energy barrier for the diffusion of carbon atoms on the surface is comparable to that from the subsurface to the surface. The results imply that both the direct surface nucleation and the surface segregation from Co bulk can be observed in the chemical vapor deposition growth of graphene on Co （200） substrate, which can gain a new insight into the growth mechanism of graphene.

关键词： adsorption diffusion carbon Co surface first-principles calculations

Analysis of Influential Factors of Konjac Glucomannan(KGM) Molecular Structure on Its Activity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2012年第4期31卷 605-613页

作者：范琳琳彭树辉温成荣何明祥魏雪琴吴春华姚闽娜冯瑞庞杰 college of food Science of Fujian Agriculture and Forestry University Guangzhou City Polytechnic Fuqing Testing Institute of Quality and Measurement

Biological activity of konjac glucomannan is closely related to its structure,in particular to its high-level *** on the activity mechanism of konjac glucomannan are significant for revealing the mysteries of participation in life *** this paper,analysis of the effects of konjac glucomannan configuration and various factors on its structure and activity was conducted,mechanism of biological activity of konjac glucomannan was explored,and the hot research topic of konjac glucomannan was given.

关键词： konjac glucomannan molecular configuration active groups activity mechanism

Insights into the enhancement of food flavor perception:strategies,mechanism and emulsion applications

在线全文

学校读者我要写书评

暂无评论

food Science and Human Wellness 2024年第5期13卷 2410-2424页

作者： Luyao Huang Yujie Dai Fan Zhang Longtao Zhang Baodong Zheng Yi Zhang Engineering Research Centre of Fujian-Taiwan Special Marine food Processing and Nutrition Ministry of EducationFuzhou 350002China college of food Science Fujian Agriculture and Forestry UniversityFuzhou 350002China

The core drivers of the modern food industry are meeting consumer demand for tasty and healthy *** application of food flavor perception enhancement can help to achieve the goals of salt-and sugar-reduction,without compromising the sensory quality of the original food,and this has attracted increasing research *** analysis of bibliometric results from 2002 to 2022 reveals that present flavor perception enhancement strategies(changing ingredient formulations,adding salt/sugar substitutes,emulsion delivery systems)are mainly carry out based on sweetness,saltiness and *** systems is becoming a novel research foci and development trends of international food flavor perception-enhancement *** structured design of food emulsions,by using interface engineering technology,can effectively control,or enhance the release of flavor ***,this review systematically summarizes strategies,the application of emulsion systems and the mechanisms of action of food flavor perception-enhancement technologies,based on odor-taste cross-modal interaction(OTCMI),to provide insights into the further structural design and application of emulsion systems in this field.

关键词： food flavor perception Emulsion Mechanism Bibliometric

Effect of smart sprinkler irrigation utilization on water use efficiency for wheat crops in arid regions

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2014年第1期7卷 26-35页

作者： Hussein Mohammed Al-Ghobari Mohamed Said Abdalla El Marazky Department of Agricultural Engineering College of Food and Agriculture Sciences King Saud UniversityRiyadh 11451Kingdom of Saudi Arabia

The smart irrigation system(SIS)developed in this research is a valuable tool for scheduling irrigation and quantifying water required by *** was implemented and tested under sprinkler irrigation system to irrigate wheat crops(YecoraRojo).Results obtained from this system were compared with the control irrigation system(CIS),whose scheduling method was based on data from an automatic weather *** indicated significant savings in applied water using the *** addition,the use of the SIS conserved 12%of irrigation water compared to CIS and obtained an economical *** water use efficiency(WUE)under SIS had generally higher values(1.64 kg/m^(3))compared to CIS(1.46 kg/m^(3)).Hence,the application of SIS technology provides significant advantages on WUE and irrigation water use efficiency(IWUE).Relatively high WUE and IWUE were found for the irrigation treatment(80%of evapotranspiration under SIS).Results showed that the irrigation requirements of wheat increased(100%of ETc under CIS)with increasing evapotranspiration(ETc)but excessive irrigation could decrease WUE and *** results indicated that extreme irrigation might not produce higher yield or optimal economic benefit,thus,suitable irrigation schedules by using SIS must be established and extendable to other agricultural crops.

关键词： smart irrigation system(SIS) sprinkler irrigation scheduling water use efficiency arid region evapotranspiration grain yield

Epitaxially strained SnTiO3 at finite temperatures

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第12期27卷 480-486页

作者： Dawei Wang Laijun Liu Jia Liu Nan Zhang Xiaoyong Wei School of Microelectronics and State Key Laboratory for Mechanical Behavior of materials Xi'an Jiaotong UniversityXi'an 710049China college of materials Science and Engineering Guilin University of TechnologyGuilin 541004China State Key Laboratory for Mechanical Behavior of materials &School of materials Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China Electronic materials Research Laboratory-Key Laboratory of the Ministry of Education and International Center for Dielectric Research Xi'an Jiaotong University Xi'an 710049China

By combining the effective Hamiltonian approach and direct ab initio computation, we obtain the phase diagram of SnTiO3with respect to epitaxial strain and temperature. This demonstrates the complex features of the phase diagram and provides an insight into this system, which is a presumably simple perovskite. Two triple points, as shown in the phase diagram, may be exploited to achieve high-performance piezoelectric effects. Despite the inclusion of the degree of freedom related to oxygen octahedron tilting, the ferroelectric displacements dominate the structural phases over the whole misfit strain range. Finally, we show that SnTiO3can change from hard to soft ferroelectrics with the epitaxial strain.

关键词： SnTiO_3 phase diagram epitaxial strain

Composite thermal protection coating on woven silica fiber fabrics

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第6期57卷 1121-1126页

作者： LIU MengXia XUE Tao ZHAO YingNa LIU Shan LIU JiaChen Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin University Analysis and Measurement Center Tianjin University Hebei Provincial Key Laboratory of Inorganic Nonmetallic materials college of materials Science and Engineering Hebei United University

A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber *** a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,*** phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetry/thermogravimetry,scanning electron microscopy,and tensile strength *** whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification *** hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics.

关键词： silica fiber fabrics AlF3/SiO2 composite coating mullite whiskers