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A Rapid Method for Determination of Some Phenolic Acids in Brazilian Tropical Fruits of Mangaba(Hancornia speciosa Gomes)and Umbu(Spondias tuberosa Arruda Camara)by UPLC

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第3期3卷 1-10页

作者： Edelvio de Barros Gomes Suyare Araújo Ramalho nayjara carvalho gualberto Rita de Cássia Mendonça de Miranda Nisha Nigam Narendra Narain Laboratory of Flavor and Chromatographic Analysis Federal University of SergipeSao CristóvaoBrazil Instituto Federal de Educacao Ciencia e Tecnologia da BahiaCanelaBrazil Department of Chemistry R.D.National CollegeBandraMumbaiIndia

A rapid chromatographic method for the determination of six phenolic acids (chlorogenic, ferulic, gallic, p-coumaric, protocatechuic and vanillic acids) by ultra performance liquid chromatography (UPLC), was developed and applied for Brazilian tropical fruits mangaba (Hancornia speciosa Gomes) and umbu (Spondias tuberosa Arruda Camara). A multivariate statistical experimental design was employed to optimize analytical conditions (solvent A, solvent B concentrations and flow rates). Samples were cleaned-up by solid-phase extraction (SPE) with different solvents (methanol and acetone) employing SPE cartridges (amine and octadecyl-silane). The method using dihydrogen potassium phosphate 5 mmoL as solvent A and 8% acetonitrile as solvent B presented limits of detection varying from 14 to 94 ***, limits of quantification from 39 to 277 ***-1 with 2 μL of injection volume while total run time for all six compounds was only 9.6 minutes. Higher recovery was obtained by extraction with methanol-acetone of 69.51% to 72.59% for protocatechuic acid and 69.58% to 126.31% for the chlorogenic acid. The concentrations of chlorogenic, p-coumaric and ferulic acids in mangaba extracts were 113.4, 32.1 and 1.5 μg.g-1, respectively while concentrations of chlorogenic, protocatechuic, gallic, vanillic, ferulic and p-coumaric acids present in umbu fruit were 118.9, 141.3, 3.5, 2.5, 2.2 and 1.8 μg.g-1, respectively.

关键词： Antioxidants Bioactive Compounds Tropical Fruits SPE UPLC-DAD

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Catechin and Epicatechin Contents in Wines Obtained from Brazilian Exotic Tropical Fruits

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Food and Nutrition Sciences 2014年第5期5卷 449-457页

作者： Suyare Araújo Ramalho nayjara carvalho gualberto Maria Terezinha Santos Leite Neta Rejane Andrade Batista Suzane Macêdo Araújo Jane de Jesus da Silveira Moreira Narendra Narain Laboratory of Flavor & Chromatographic Analyses/PROCTA Federal University of Sergipe Sao Cristóvao Brazil

Flavonoids constitute a diverse group of secondary metabolites which are present in both fruits and wines. The contents of some of the most prominent compounds such as catechin and epicatechin are little known in wines prepared from tropical fruits. In this context, this study was aimed to determine catechin and epicatechin contents in wines processed from 7 tropical fruits (cajá-umbu, cashew apple, mangaba, pineapple, siriguela, sugar apple and umbu), by HPLC-DAD system. Moreover the total phenolic compounds content was also determined in these wines and compared to those of the commercial wines obtained from grapes and cashew apple. The wines produced in this work contained higher total phenolic compounds contents when compared to that of the grape wines. The higher values of total phenolic compounds were found in wines elaborated from cajá-umbu (123.4 mg·mL-1 GAE) and from cashew (87.5 mg·mL-1 GAE). However, higher contents of catechin and epicatechin were found in wines obtained from mangaba (14.01 ± 0.37 mg·L-1, 22.66 ± 1.03 mg·L-1), siriguela (9.97 ± 0.28, 4.38 ± 0.45) and cashew apple (7.46 ± 0.18, 1.30 ± 0.17) fruits. The present work indicates that the use of exotic tropical fruits is feasible in developing wines which could serve as functional foods as these contain appreciable quantities of catechin and epicatechin.

关键词： Tropical Fruits Cajá-Umbu Mangaba Cashew Apple Siriguela Wines HPLC-DAD

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Design multifunctional Mg–Zr coatings regulating Mg alloy bioabsorption

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Journal of Magnesium and Alloys 2024年第4期12卷 1461-1478页

作者： Zohra Benzarti Sandesh Itani JoséDavid Castro Sandra carvalho Ana Sofia Ramos University of Coimbra CEMMPREARISEDepartment of Mechanical EngineeringRua Luís Reis Santos3030-788CoimbraPortugal Laboratory of Multifunctional Materials and Applications(LaMMA) Department of PhysicsFaculty of Sciences of SfaxUniversity of SfaxSoukra Road km 3.5B.P.1171Sfax3000Tunisia

Magnesium(Mg)alloys are widely used for temporary bone implants due to their favorable biodegradability,cytocompatibility,hemocompatibility,and close mechanical properties to ***,rapid degradation and inadequate strength limit their *** overcome this,the direct current magnetron sputtering technique is employed for surface coating in Mg-based alloys using various zirconium(Zr)*** approach presents a promising strategy for simultaneously improving corrosion resistance,maintaining biocompatibility,and enhancing strength without compromising *** leveraging Mg’s inherent biodegradability,it has the potential to minimize the need for secondary surgeries,thereby reducing costs and *** paper is a systematic study aimed at understanding the corrosion mechanisms of Mg–Zr coatings,denoted Mg-xZr(x=0–5 at.%).Zr-doped coatings exhibited columnar growth leading to denser and refined structures with increasing Zr *** analysis confirmed the presence of the Mg(00.2)basal plane,shifting towards higher angles(1.15°)with 5 at.%Zr doping due to lattice parameter changes(i.e.,decrease and increase of“c”and“a”lattice parameters,respectively).Mg–Zr coatings exhibited“liquidphilic”behavior,while Young’s modulus retained a steady value around 80 GPa across all ***,the hardness has significantly improved across all samples’coating,reaching the highest value of(2.2±0.3)GPa for 5 at.%*** testing in simulated body fluid(SBF)at 37℃ revealed a significant enhancement in corrosion resistance for Mg–Zr coatings containing 1.0–3.4 at.%*** with the 5 at.%Zr coating which exhibited a corrosion rate of 32 mm/year,these coatings displayed lower corrosion rates,ranging from 1 to 12 mm/*** synergistic enhancement in mechanical properties and corrosion resistance,achieved with 2.0–3.4 at.%Zr,suggests potential ability for reducing stress shielding and controlled degradation performance,and consequentl

关键词： Mg-Zr coatings Magnetron sputtering Nanoindentation Corrosion resistance Bone implants

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Review on the state-of-the-art and challenges in the MgB_(2)component manufacturing for superconducting applications

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Superconductivity 2024年第1期9卷 50-64页

作者： Fabiano carvalho de Castro Sene Department of Industrial and Systems Engineering University of TennesseeKnoxvilleUnited States

Since the discovery of MgB_(2)as a superconductor,several research groups worldwide have studied the superconducting mechanisms due to the dual gap nature of MgB_(2),as well as attempted to produce such a compound in wires,tapes,bulks,and thin films for a plethora of *** MgB_(2)carries the promise of replacing Niobium‐based superconductors in low‐field applications,less‐than‐desirable performance and in‐operation stability has slowed down such a *** the properties and nature of the superconductivity of MgB_(2)are fairly known,the reproduction of its properties at manufacturing scales remains an unsolved ***,this manuscript presents a systematic review on fundamental properties,phase formation,growth kinetics,and superconducting properties of MgB_(2)‐based components such as multi‐and mono‐core wires,bulks,and thin ***,challenges,and shortcomings are utilized in consolidating research questions and directions pertaining to the manufacturing of MgB_(2)superconducting ***,we evaluate the technological readiness of MgB_(2)‐based devices for applications in fusion energy systems.

关键词： MgB_(2) Superconductor manufacturing Technology readiness Review Low‐Field applications

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Addressing inclusion,innovation,and sustainability challenges through the lens of economic geography:Introducing the hierarchical regional innovation system

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地理学与可持续性（英文） 2024年第1期5卷 1-12页

作者： Iván Tartaruga Fernanda Sperotto Luís carvalho Centre of Studies in Geography and Spatial Planning(CEGOT) Faculty of Arts and HumanitiesUniversity of PortoPorto 4150-564Portugal Centre of Studies in Geography and Spatial Planning(CEGOT) Faculty of Arts and HumanitiesUniversity of PortoPorto 4150-564Portugal School of Economics and Management University of PortoPortoPortugal

The world is facing dramatic challenges related to environmental sustainability at an accelerating *** this context,the field of economic geography(EG)has been playing an important role in understanding both the socioeconomic and technological dimensions of these challenges,as it deals with a variety of complementary notions and *** from this lens,our aim is to explore a conceptual framework that can help us to understand environmental changes relating to multi-dimensional territorial development,notably in eco-nomic contexts where inequality is high,and stratification based on hierarchies regulate social and economic *** on the territory concept,we propose the original notion of a hierarchical regional innovation system(HRIS)that emphasises the pervasive role of hierarchies(powers)in regional innovation systems and illustrate its value with evidence and case studies from extant literature on sustainability *** HRIS can help us understand and promote development paths considering the contribution of inclusive eco-innovations(another original conceptual amalgam).Through some empirical cases from other studies in low-carbon transitions,we show the application of the HRIS(and inclusive eco-innovation)*** conclusion,we provide incen-tives to explore new regional innovation systems,alongside the HRIS,adapted to different regions worldwide and centred on the inclusiveness of people and places.

关键词： Inclusive eco-innovation Inclusive innovation Hierarchical regional innovation system (HRIS) Territorial development Sustainable development Sustainability transitions

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Contribution of mechanical forces to structural synaptic plasticity:insights from 3D cellular motility mechanisms

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Neural Regeneration Research 2025年第7期20卷 1995-1996页

作者： Rita O.Teodoro Mafalda Ribeiro Ramos Lara carvalho iNOVA4Health NOVA Medical School|Faculdade de Ciências MédicasNMS|FCMUniversidade Nova de LisboaLisboaPortugal

Cells,tissues,and organs are constantly subjected to the action of mechanical forces from the extracellular environment-and the nervous system is no ***-intrinsic properties such as membrane lipid composition,abundance of mechanosensors,and cytoskeletal dynamics make cells more or less likely to sense these *** and extrinsic cues are integrated by cells and this combined information determines the rate and dynamics of membrane protrusion growth or retraction(Yamada and Sixt,2019).Cell protrusions are extensions of the plasma membrane that play crucial roles in diverse contexts such as cell migration and neuronal synapse *** the nervous system,neurons are highly dynamic cells that can change the size and number of their pre-and postsynaptic elements(called synaptic boutons and dendritic spines,respectively),in response to changes in the levels of synaptic activity through a process called *** plasticity is a hallmark of the nervous system and is present throughout our lives,being required for functions like memory formation or the learning of new motor skills(Minegishi et al.,2023;Pillai and Franze,2024).

关键词： plasticity structural mechanisms

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Determination of critical state line(CSL)for silty-sandy iron ore tailings subjected to low-high confining pressures

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1684-1695页

作者： Nilo Cesar Consoli João Vítor de Azambuja carvalho Alexia Cindy Wagner Hugo Carlos Scheuermann Filho Inácio carvalho Pedro Pazzoto Cacciari João Paulo de Sousa Silva Civil Engineering Universidade Federal do Rio Grande do SulPorto AlegreRS90035-190Brazil Exploration and Mineral Projects-Mineral Development Centre VALE S.A.Santa LuziaMG33040-900Brazil Department of Civil Geological and Mining EngineeringPolytechnique MontrealQuebecH3C 3A7Canada

The disposal of filtered tailings in high dry stacks can induce particle breakage,changing the material's behaviour during the structure's *** grading changes influence material properties at the critical state,and this is not mature for intermediate artificial soils(tailings)in a broad range of confining *** this paper,it aims to describe the behaviour of iron ore tailings in a spectrum of confining pressures broader than the reported in previous studies.A series of consolidated drained(CD)triaxial tests was carried out with confining pressures ranging from 0.075 MPa to 120 *** results show that the amount of breakage plays an essential role in the response of iron ore *** existence of curved critical state line(CSL)in both specific volume(ν)-logarithm of mean effective stress(p′)and deviatoric stress(q)-mean effective stress(p′)planes,and different responses in the deviatoric stress-axial strain-volumetric strain curves were *** inverse S-shaped equation was proposed to represent the silty-sandy tailings'behaviour up to high pressures onν-lnp′*** proposed equation provides a basis for enhancing constitutive models and considers the evolution of the grading up to severe loading *** adjustment considered three regions with different responses associated with particle breakage at different pressure levels.

关键词： Tailings Iron ore tailings dry stacking Silty-sandy material Critical state soil mechanics High confining pressures Particle breakage

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Starch Orodispersible Film Loaded with Melatonin for Human Supplementation

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Journal of Renewable Materials 2024年第7期12卷 1343-1354页

作者： Fabio Tamanini Tatiane Zucchini de Souza Creusa Sayuri Tahara Amaral Antônio JoséFelix carvalho Eliane Trovatti Department of Health and Biological Sciences University of Araraquara(UNIARA)São Paulo14801-340Brazil Department of Materials Engineering São Carlos School of EngineeringUniversity of São PauloSão Paulo13563-120Brazil

An innovative pharmaceutical form for administering melatonin,based on starch orodispersibleﬁlm(ODF),was designed and *** composition of the ODF included starch as the polymer matrix,the active drug melatonin,and a ***,a natural hormone produced by the pineal gland in the brain,can be absorbed by passive diffusion across the mucous membrane,resulting in improved bioavailability when compared to conventional oral *** study shows a simple and efﬁcient method for preparing melatonin-loaded orodispersibleﬁlms with a physically stable and commercially viable matrix,suitable for use in the pharmaceutical ***ﬁlms were prepared by treating the starch with microwave irradiation,followed by plasticization with glycerol,melatonin loading and drying by solvent *** tests showed theﬁlms’robustness,with a modulus of approximately 97 MPa,indicating good handling *** uptake analysis showed fast water absorption,reaching about 150%within 2 min,indicating its fast oral disintegration *** tests in artiﬁcial saliva and dissolution studies indicated the release of the drug in min-utes,indicating the potential properties of theﬁlm for oral drug *** the best of our knowledge,there is no melatonin ODF based on starch described in the literature.

关键词： Starch orodispersibleﬁlm melatonin drug delivery

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Simulated rainfall in Brazil:An alternative for assesment of soil surface processes and an opportunity for technological development

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International Soil and Water Conservation Research 2024年第1期12卷 29-42页

作者： Camila Calazans da Silva Luz Wilk Sampaio de Almeida Adilson Pacheco de Souza Nivaldo Schultz Jamil Alexandre Ayach Anache Daniel Fonseca de carvalho Postgraduate Program in Agronomy-Soil Sciences Federal Rural University of Rio de JaneiroSeropédicaRJBrazil Agronomy Department Federal Institute of EducationScience and Technology of RondôniaAriquemesROBrazil Federal University of Mato Grosso SinopMTBrazil Federal Rural University of Rio de Janeiro SeropédicaRJBrazil Federal University of Mato Grosso do Sul Campo GrandeMSBrazil

Rainfall simulators(RS)have been used,above all,to evaluate hydrological processes related to soil water infiltration,surface runoff and soil *** allow repeatability of rain application with different precipitation intensities in field and/or laboratory conditions and should produce events with physical characteristics similar to natural *** this manuscript,we carried out a bibliometric and scientometric analysis of studies with simulated rainfall in Brazil to assess the temporal evolution of publications,the main topics addressed and the degree of technological development of the *** searched for the terms“rainfall simulator”OR“simulated rainfall”AND“Brazil”in the Scopus,Web of Science,SciELO and Google Scholar *** found 143 articles published in the last 37 years(1985-2022).Our findings indicate that the main research areas covered in papers are soil erosion(57.34%),soil water infiltration(24.47%),nutrient losses(9.8%)and RS development and calibration/assessment(8.39%).In recent years,the number of published papers in international high-impact factor journals has *** of the papers(49.65%)refer to studies carried out by institutions located in the south and southeast regions of ***,there is a large gap of studies on simulated rainfall in other regions of Brazil,where important biomes such as the Cerrado,Amazon,Caatinga,and their transitions are *** study informs research priorities on soil erosion under simulated rainfall and provides a bibliographic database that can assist in more detailed future analyses.

关键词： Rainfall simulator Soil and water losses Soil water infiltration Bibliometrics Scientific review

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China-Brasil:una sinfonía en cuatro movimientos

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今日中国（西文版） 2024年第3期 38-39页

作者： EVANDRO MENEZES DE carvalho 不详

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