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Biofabrication of nanocomposite-based scaffolds containing human bone extracellularmatrix for the differentiation of skeletal stem and progenitor cells

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Bio-Design and Manufacturing 2024年第2期7卷 121-136页

作者： Yang-Hee Kim Janos M.Kanczler Stuart Lanham Andrew Rawlings Marta Roldo Gianluca Tozzi Jonathan I.dawson Gianluca Cidonio Richard O.C.Oreffo Faculty of Medicine Bone and Joint Research GroupCentre for Human DevelopmentStem Cells and RegenerationInstitute of Developmental SciencesUniversity of SouthamptonSouthampton SO166YDUK School of Pharmacy and Biomedical Science University of PortsmouthPortsmouth PO12DTUK School of engineering Faculty of Engineering and ScienceUniversity of GreenwichGreenwich ME44TBUK Center for Life Nano-and Neuro-Science(CLN2S) Italian Institute of Technology00161 RomeItaly

Autograft or metal implants are routinely used in skeletal ***,they fail to provide long-term clinical resolution,necessitating a functional biomimetic tissue engineering *** use of native human bone tissue for synthesizing a biomimeticmaterial inkfor three-dimensional(3D)bioprintingof skeletal tissueis anattractivestrategyfor ***,human bone extracellular matrix(bone-eCM)offers an exciting potential for the development of an appropriate microenvironment for human bone marrow stromal cells(HBMSCs)to proliferate and differentiate along the osteogenic *** this study,we engineered a novel material ink(LAB)by blending human bone-eCM(B)with nanoclay(L,Laponite®)and alginate(A)polymers using extrusion-based *** inclusion of the nanoﬁller and polymeric material increased the rheology,printability,and drug retention properties and,critically,the preservation of HBMSCs viability upon *** composite of human bone-eCM-based 3D constructs containing vascular endothelial growth factor(VeGF)enhanced vascularization after implantation in an ex vivo chick chorioallantoic membrane(CAM)*** inclusion of bone morphogenetic protein-2(BMP-2)with the HBMSCs further enhanced vascularization and mineralization after only seven *** study demonstrates the synergistic combination of nanoclay with biomimetic materials(alginate and bone-eCM)to support the formation of osteogenic tissue both in vitro and ex vivo and offers a promising novel 3D bioprinting approach to personalized skeletal tissue repair.

关键词： extracellular matrix Nanoclay Bone 3D bioprinting

In_(2)O_(3)/Bi_(19)Br_(3)S_(27)S型异质结增强光催化CO_(2)还原

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Science China Materials 2024年第2期67卷 514-523页

作者：卞玉琴何厚伟 Graham dawson 张金锋代凯 Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationAnhui Province Key Laboratory of Intelligent Computing and ApplicationsAnhui Province Industrial Generic Technology Research Center for Alumics MaterialsHuaibei Normal UniversityHuaibei 235000China Department of Chemistry Xi’an Jiaotong Liverpool UniversitySuzhou 215123China

近年来,半导体催化剂因其较强的氧化还原能力和较好的稳定性而受到广泛关注.然而,光生电子和空穴对易复合和低氧化性导致单一半导体催化剂难以实现实际应用.深入研究表明,S型异质结具有独特的电子和空穴分离机理、强大的氧化还原能力和... 详细信息

近年来,半导体催化剂因其较强的氧化还原能力和较好的稳定性而受到广泛关注.然而,光生电子和空穴对易复合和低氧化性导致单一半导体催化剂难以实现实际应用.深入研究表明,S型异质结具有独特的电子和空穴分离机理、强大的氧化还原能力和较强的载流子分离驱动力.本研究以在In_(2)O_(3)纳米球上生长的Bi_(19)Br_(3)S_(27)纳米花为原料,采用水热法合成了In_(2)O_(3)/Bi_(19)Br_(3)S_(27)梯形异质结.这种梯形异质结有效地促进了光生电荷载流子的分离和转移.结果表明,In_(2)O_(3)/Bi_(19)Br_(3)S_(27)复合材料对CO_(2)的还原产率高达28.36μmol h^(-1)g^(-1),分别是In_(2)O_(3)和Bi_(19)Br_(3)S_(27)的19和3.5倍.此外,通过原位漫反射红外傅里叶变换光谱对参与光催化反应的中间体进行了研究,揭示了光催化还原CO_(2)的反应过程.本工作为构建S型异质结光催化剂增强CO_(2)催化还原的方法提供了较好的研究思路.

关键词： photocatalytic CO_(2)reduction S-scheme heterojunction In_(2)O_(3) Bi_(19)Br_(3)S_(27)

Chalcogenide-based S-scheme heterojunction photocatalysts

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Chinese Journal of Catalysis 2024年第8期63卷 81-108页

作者： Chunguang Chen Jinfeng Zhang Hailiang Chu Lixian Sun Graham dawson Kai Dai Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004GuangxiChina Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationCollege of Physics and Electronic InformationHuaibei Normal UniversityHuaibei 235000AnhuiChina Department of Chemistry Xi’an Jiaotong Liverpool UniversitySuzhou 215123JiangsuChina

The unique photocatalytic mechanism of S-scheme heterojunction can be used to study new and efficient *** carefully selecting semiconductors for S-scheme heterojunction photo-catalysts,it is possible to reduce the rate of photogenerated carrier recombination and increase the conversion efficiency of light into *** are a group of compounds that include sulfides and selenides(e.g.,CdS,ZnS,Bi_(2)S_(3),MoS_(2),ZnSe,CdSe,and CuSe).Chalcogenides have at-tracted considerable attention as heterojunction photocatalysts owing to their narrow bandgap,wide light absorption range,and excellent photoreduction *** paper presents a thor-ough analysis of S-scheme heterojunction photocatalysts based on *** an introduction to the fundamental characteristics and benefits of S-scheme heterojunction photocata-lysts,various chalcogenide-based S-scheme heterojunction photocatalyst synthesis techniques are *** photocatalysts are used in numerous significant photocatalytic reactions,in-cluding the reduction of carbon dioxide,synthesis of hydrogen peroxide,conversion of organic matter,generation of hydrogen from water,nitrogen fixation,degradation of organic pollutants,and *** addition,cutting-edge characterization techniques,including in situ characterization techniques,are discussed to validate the steady and transient states of photocatalysts with an S-scheme ***,the design and challenges of chalcogenide-based S-scheme het-erojunction photocatalysts are explored and recommended in light of state-of-the-art research.

关键词： Photocatalysis Chalcogenide S-scheme heterojunction Charge separation Application

Overview of legal traceability of GPS positioning in Australia

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Satellite Navigation 2020年第1期1卷 275-286页

作者： Guorong Hu John dawson National Positioning Infrastructure Branch Geoscience AustraliaCnr Jerrabomberra Avenue and Hindmarsh Drive SymonstonGPO Box 378CanberraACT 2601Australia

Global Positioning System(GPS)position verification and legal traceability in Australia supports industry,trade,science and innovation and is trusted and recognized domestically and *** the end of 2017,the Australia’s national datum was transitioned from the Geocentric Datum of Australia 1994(GDA94)to the Geocentric Datum of Australia 2020(GDA2020).As such,the datum for the legal traceability of GPS positions in Australia has also moved to *** paper highlights the importance of legal metrology and measurement in terms of GPS positions in accordance with the National Measurement Act 1960(Commonwealth of Australia).Here we provide an overview of the process of issuing the so-called‘Regulation 13 Certificates’for Continuously Operating Reference Stations(CORS)across *** position verification methodology is detailed,including the quality control,metadata assurance,and dynamic management of the certificates as well as positional uncertainty determination of CORS with varying quality.A quality monitoring system of positions is also discussed along with how measurement traceability is ensured including short-term and long-term position monitoring schemes.

关键词： GPS Regulation 13 certificate Legal traceability GDA2020 Position verification

Metabolic effects of intestinal absorption and enterohepatic cycling of bile acids

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Acta Pharmaceutica Sinica B 2015年第2期5卷 129-134页

作者： Courtney B.Ferrebee Paul A.dawson Department of Pediatrics Division of Gastroenterology Hepatology and Nutrition Emory University Molecular Medicine Graduate Program Wake Forest School of Medicine

The classical functions of bile acids include acting as detergents to facilitate the digestion and absorption of nutrients in the gut. In addition, bile acids also act as signaling molecules to regulate glucose homeostasis, lipid metabolism and energy expenditure. The signaling potential of bile acids in compartments such as the systemic circulation is regulated in part by an efficient enterohepatic circulation that functions to conserve and channel the pool of bile acids within the intestinal and hepatobiliary compartments. Changes in hepatobiliary and intestinal bile acid transport can alter the composition, size,and distribution of the bile acid pool. These alterations in turn can have significant effects on bile acid signaling and their downstream metabolic targets. This review discusses recent advances in our understanding of the inter-relationship between the enterohepatic cycling of bile acids and the metabolic consequences of signaling via bile acid-activated receptors, such as farnesoid X nuclear receptor(FXR)and the G-protein-coupled bile acid receptor(TGR5).

关键词： Bile acids Liver Intestine Transporters Lipid metabolism energy homeostasis

Spherical f-Tilings by Two Noncongruent Classes of Isosceles Triangles-Ⅱ

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Acta Mathematica Sinica,english Series 2014年第8期30卷 1435-1464页

作者： Ana BReDA Robert dawson Patrícia RIBeIRO Department of Mathematics University of Aveiro Department of Mathematics and Computing Science Saint Mary’s University Halifax Department of Mathematics EST SetbalPolytechnic Institute of Setbal

In this work,we give a complete classification of spherical dihedral f-tilings when the prototiles are two noncongruent isosceles triangles with certain adjacency *** it will be shown,this class is composed by two dis... 详细信息

关键词： Spherical tilings dihedral triangulations f-tilings spherical trigonometry

Compacted graphite iron-A material solution for modern diesel engine cylinder blocks and heads

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China Foundry 2009年第3期6卷 241-246页

作者： Steve dawson SinterCast Sweden

The demands for improved fuel economy,performance and emissions continue to pose challenges for engine designers and the materials they choose. This is particularly true for modern diesel engines,where the primary path to achieving improved engine performance and emissions is to increase the Peak Firing Pressure in the combustion chamber. The resulting increase in thermal and mechanical loading has required a change from conventional grey cast iron to Compacted Graphite Iron (CGI) in order to satisfy durability requirements without increasing the size or the weight of the engines. With at least 75% higher tensile strength,45% higher stiffness and approximately double the fatigue strength of conventional grey cast iron,CGI satisfies durability requirements and also provides the dimensional stability required to meet emissions legislation throughout the life of the engine. Currently,there are no CGI diesel engines running on the roads in North America. This is set to change considerably as new commercial vehicle and pick-up SUV diesel engines are launched with CGI cylinder blocks in 2008 and 2009. These initial programs will provide over 2 million CGI diesel engines when ramped to mature volume,potentially accounting for 10%-15% of the North American passenger vehicle fleet within the next four years.

关键词： compacted graphite iron modern diesel engine performance emission cylinder blocks and heads

In-situ fabrication of Bi_(2)S_(3)/BiVO_(4)/Mn_(0.5)Cd_(0.5)S-DeTA ternary S-scheme heterostructure with effective interface charge separation and CO_(2) reduction performance

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Journal of Materials Science & Technology 2022年第22期117卷 109-119页

作者： Zhiwei Zhao Xiaofeng Li Kai Dai Jinfeng Zhang Graham dawson Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationHuaibei Normal UniversityHuaibei 235000China Department of Chemistry Xi’an Jiaotong Liverpool UniversitySuzhou 215123China

exploring new and efficient photocatalysts to boost photocatalytic CO_(2) reduction is of critical importance for solar-to-fuel *** this study,through the in-situ growth method,a series of S-scheme mechanism Bi_(2)S_(3)/BiVO_(4)/Mn_(0.5)Cd_(0.5)S-DeTA nanocomposites with good photocatalytic activity were *** extremely small size of Mn_(0.5)Cd_(0.5)S-DeTA nanoparticles provides more active sites for photocatalytic *** order to solve the serious shortcomings of sulfide photo-corrosion,BiVO_(4) were introduced as oxidation catalyst to consume too many holes and improve the stability of the *** addition,the in-situ growth method produces the reduction cocatalyst Bi_(2)S_(3) during the BiVO_(4) and Mn_(0.5)Cd_(0.5)S-DeTA recombination process,thereby improving the efficiency of charge transfer at their interface *** ternary composite unveils a higher CO_(2)-reduction rate(44.74μmol g^(−1) h^(−1))comparing with pristine BiVO_(4)(14.11μmol g^(−1) h^(−1)).The enhanced photocatalytic CO_(2) reduction performance is due to the special interface structure of the S-scheme Bi_(2)S_(3)/BiVO_(4)/Mn_(0.5)Cd_(0.5)S-DeTA photocatalyst,which facilitates the charge separation at the interface and improves its photocatalytic activity and stability.

关键词： Step-scheme heterojunction Bi_(2)S_(3) BiVO_(4) Mn_(0.5)Cd_(0.5)S Photocatalytic CO_(2)reduction

The circulation physiology of agroecosystems

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ecological economy 2007年第1期3卷 2-7页

作者： Richard dawson College of Resources and environmental Sciences China Agricultural University

This paper represents an effort to enlarge the understanding of the biophysical foundation of agroecosystemsby using an analogy with the circulation of the blood in the human body. The circulation function in the human body canbe represented as arterial pressure. The factors affecting arterial pressure in the human body have direct counterpartsin the cultivation-husbandry system. The relationship between circulation pressure and the factors affecting that pressurein the cultivation-husbandry system are similar to the relationship between the arterial pressure and factors affectingarterial pressure in the human body. Furthermore, circulation resistance in the cultivation-husbandry system can beshown to be analogous to the calculation of peripheral resistance in the human body by Poiseuille’s formula.

关键词： Agroecosystem Assessment criterion Circulation function