3,773 results on '"Afonso A"'
Search Results
2. What Is Mozambican Chemistry? An Autoethnographic Inquiry.
- Author
-
Taylor, Peter Charles and Zulmira de F. Afonso, Emilia
- Abstract
This study was designed to contribute to the development of science teacher education grounded in a Mozambican context. How well the university system prepares science teachers to teach in a Mozambican context was examined by adopting an auto-ethnographic research approach. (KHR)
- Published
- 2003
3. A Framework for Assessing Manufacturing SMEs Industry 4.0 Maturity
- Author
-
Afonso Amaral and Paulo Peças
- Subjects
the fourth industrial revolution ,advanced technology ,readiness assessment ,digital transformation ,organization change ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Under the scenario of the fourth industrial revolution, the adoption of Industry 4.0 in the day-to-day business of small and medium enterprises (SME) entails expected challenges. Focusing primarily on more advanced levels of maturity, the existing maturity models are inadequate for assessing companies with low maturity levels, such as most of existing SMEs. A framework for a maturity model tailored to SMEs is proposed in this paper, allowing for a comprehensive and high granularity assessment of these companies’ maturity levels, which then eases their integration into this industrial revolution. The proposed holistic model considers all Industry 4.0 dimensions while being detailed enough in its initial levels to properly assess SMEs at the same time.
- Published
- 2021
- Full Text
- View/download PDF
4. Rheology, Hydration, and Microstructure of Portland Cement Pastes Produced with Ground Açaí Fibers
- Author
-
Afonso Azevedo, Paulo de Matos, Markssuel Marvila, Rafael Sakata, Laura Silvestro, Philippe Gleize, and Jorge de Brito
- Subjects
açaí fiber ,cement pastes ,rheology ,hydration ,microstructure ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Açaí (Euterpe oleracea) is a Brazilian typical fruit that is enveloped by natural fibers. This work investigated the effect of incorporating ground açaí fibers (in natura and chemically treated with NaOH and HCl) in 5–10 wt.% replacement of Portland cement on the rheology, hydration, and microstructure of pastes. Rotational rheometry, isothermal calorimetry, X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) were performed to evaluate the cement pastes, in addition to SEM-EDS, FTIR, zeta potential, and XRD for fiber characterization. The results showed that the chemical treatment reduced the cellulose and lignin contents in açaí fibers while increasing its surface roughness. The addition of 5% of either fiber slightly increased the yield stress and viscosity of paste, while 10% addition drastically increased these properties, reaching yield stress and viscosity values respectively 40 and 8 times higher than those of plain paste. The incorporation of 5% in natura fibers delayed the cement hydration by about 2.5 days while 10% in natura fibers delayed it by over 160 h. The chemical treatment significantly reduced this retarding effect, leading to a 3 h delay when 5% treated fibers were incorporated. Overall, the combined NaOH/HCl treatment was effective for açaí fibers functionalization and these fibers can be used in cementitious composites.
- Published
- 2021
- Full Text
- View/download PDF
5. The Role of 'Popular' Books in Informal Chemical Education
- Author
-
Afonso, Ana Sofia and Gilbert, John K.
- Abstract
"Popular science books" can contribute to enhancing public engagement with chemistry, yet there has been no systematic study of the availability, use, and educational significance of these books. This paper identifies titles in the catalogues of some major publishers, the content of these books, the criteria that readers might use in judging their educational worth, and the value of these categories of books for promoting public engagement with chemistry. One hundred and ninety-three popular chemistry books, written in English and/or Portuguese, were identified in the catalogues of 80 major publishers. This identification and classification into themes were carried out by an analysis of synopses and introductions. In addition, an opportunity sample of 17 Portuguese undergraduate students, with no extensive backgrounds in science, was invited to produce a written evaluation of a book of their own choice. The producers of unusual or incisive evaluations (nine readers) were also interviewed. It was found that popular books can contribute to public engagement with chemistry when they have specific textual characteristics. There is a need for more books in Portuguese, and for more titles in specific fields, in order to broaden readers' perceptions of the cultural value of chemistry.
- Published
- 2013
- Full Text
- View/download PDF
6. Chemistry Practical Lessons: Altering Traditions for Students' Emancipation
- Author
-
Nhalevilo, Emilia Afonso
- Abstract
This paper is a response to Maria Andree's paper. Andree tells in the paper how mistakes in practical lessons may be critical events to change students' attitudes in regard science. While traditionally mistakes in practical lessons could obligate students to repeat the experiment in order to get the "right result" in the paper we have a good example how we can use the incident to potentiate students' participation. In my response I illustrate how transferable is what Andree speaks about but I put forward further reflections about the traditions that may act as impediment for students' participation. I thus suggest that the critical paradigm should be a component in reflecting about science classroom practices in order to alter the traditions.
- Published
- 2012
- Full Text
- View/download PDF
7. Zinc Biosorption by Seaweed Illustrated by the Zincon Colorimetric Method and the Langmuir Isotherm
- Author
-
Areco, Maria Mar, dos Santos Afonso, Maria, and Valdman, Erika
- Abstract
An experiment is conducted to promote biotechnology knowledge that is an emerging technology on cleaning treatment, showing the potential of seaweed to remove heavy-metal ions from solution. The rapid and accurate determination of zinc in aqueous solution by the zincon colorimetric method gives an interesting and simple experiment for any biotechnology program that deals with environmental contamination.
- Published
- 2007
8. A comparative study of antioxidant capacity of amino acids using the Fe(II)/1-nitroso-2-naphthol-3,6-disulfonic complex and the Folin-Ciocalteu reagent: application in blood serum
- Author
-
Carvalho, Luisa Menezes de, Souza, Maryane Woth de, Fonseca, Fernando Luiz Afonso, and Moya, Horacio Dorigan
- Subjects
Serum -- Testing ,Antioxidants -- Composition -- Testing ,Amino acids -- Properties ,Chemistry - Abstract
The oxidation of 20 amino acids (AA; alanine, arginine, asparagine, aspartic acid, cysteine (Cys), glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, Scrine, threonine, tryptophan, tyrosine, and valine) by Fe(III) in a buffered aqueous solution (pH 8.0, Tris) containing 1-nitroso-2-naphthol-3,6-disulfonic acid ([H.sub.2]NRS) was spectrophotometrically evaluated. Under the employed conditions, Fe(III) was reduced to Fe(II) to afford greenish Fe[(NRS).sub.3.sup.4-], the absorbance of which at [[lambda].sub.max] = 730nm was correlated to AA reducing capacity and expressed as ascorbic acid equivalents (A[S.sub.E]). Comparison of the thus obtained A[S.sub.E] values with those determined using the Folin-Ciocalteu reagent (FCR) revealed that all analyzed AA preferentially reacted with Fe(III)-[H.sub.2]NRS rather than with the FCR. The obtained insights were utilized to develop a spectrophotometric procedure for the quantitation of the total antioxidant capacity (TAC) of blood serum samples in solution containing Fe(III) and [H.sub.2]NRS (pH 8.0, Tris). The TAC values (in m[g.sub.Cys] m[L.sup.-1] serum) of 22 serum samples determined by the Fe(III)-NRS method were well correlated with those determined using the FCR method (r = 0.788), which suggested that the proposed procedure can be used to quantify the TAC of other protein-rich biological samples. Key words: antioxidant capacity, amino acid, 1-nitroso-2-naphthol-3,6-disulfonic acid, Fe(II), Fe(III), blood serum Nous avons evalue par spectrophotometrie l'oxydation de 20 acides amines (AA; l'alanine, l'arginine, l'asparagine, l'acide aspartique, la cysteine (Cys), l'acide glutamique, la glutamine, la glycine, l'histidine, l'isoleucine, la leucine, la lysine, la methionine, la phenylalanine, la proline, la serine, la threonine, le tryptophane, la tyrosine et la valine) par le Fe(III) dans une solution aqueuse tamponnee (pH 8,0; Tris) contenant de l'acide 1 nitroso-2-naphtol-3,6-disulfonique ([H.sub.2]NRS). Dans les conditions employees, le Fe(III) a subi une reduction en Fe(II) pour former le compose verdatre Fe[(NRS).sub.3.sup.4-], dont l'absorbance a [[lambda].sub.max] = 730 nm a ete correlee a la capacite de reduction des AA et exprimee en equivalents d'acide ascorbique (A[S.sub.E]). En comparant les valeurs d'A[S.sub.E] ainsi obtenues avec celles determinees a l'aide du reactif de Folin Ciocalteau (RFC), nous avons constate que tous les AA analyses reagissent preferentiellement avec le Fe(III) [H.sub.2]NRS plutot qu'avec le RFC. Nous avons utilise les connaissances que nous avons acquises pour mettre au point une methode spectrophotometrique permettant de quantifier la capacite antioxydante totale (CAT) d'echantillons de serum sanguin dans des solutions contenant du Fe(III) et du [H.sub.2]NRS (pH 8,0; Tris). Les valeurs de CAT (en m[g.sub.Cys] m[L.sup.-1] de serum) provenant de 22 echantillons de serum que nous avons determinees par la methode du Fe(III)-NRS ont revele une forte correlation avec celles determinees par la methode du RFC (r = 0,788), ce qui permet d'entrevoir la possibilite d'utiliser la methode proposee pour quantifier la CAT d'autres echantillons biologiques riches en proteines. [Traduit par la Redaction] Mots-cles : capacite antioxydante, acide amine, 1-nitroso-2-naphtol-3,6-disulfonique, Fe(II), Fe(III), serum sanguin, Introduction The reducing capacity of amino acids (AA) is an index associated with the generation of important metabolites. (1-5) Moreover, AA form peptides and proteins that may exhibit reasonable antioxidant [...]
- Published
- 2023
- Full Text
- View/download PDF
9. Dispersive Miniaturized Solid-Phase Extraction Using the CIM-81 Metal-Organic Framework and Gas Chromatography-Mass Spectrometry to Determine Personal Care Products in Waters
- Author
-
Gonzalez-Hernandez, Providencia, Lago, Ana B., Pasan, Jorge, Ayala, Juan H., Afonso, Ana M., and Pino, Veronica
- Subjects
Chemistry - Abstract
The use of metal-organic frameworks (MOFs) in miniaturized extraction approaches is already successful in analytical sample preparation, particularly when combined with liquid chromatography. This study shows the determination of several [...]
- Published
- 2019
10. Temporal order of clinical and biomarker changes in familial frontotemporal dementia
- Author
-
Staffaroni, Adam M, Quintana, Melanie, Heller, Carolin, Boeve, Bradley F, Rosen, Howard J, Rohrer, Jonathan D, Boxer, Adam L, Initiative, Frontotemporal Dementia Prevention, Apostolova, Liana, Barmada, Sami, Boeve, Bradley, Bozoki, Andrea, Clark, Annie L, Clark, David, Coppola, Giovanni, Darby, Ryan, Dickson, Dennis, Faber, Kelley, Fagan, Anne, Galasko, Douglas R, Grant, Ian M, Huang, Eric, Kerwin, Diana, Taylor, Jack Carson, Lapid, Maria, Lee, Suzee, Leger, Gabriel, Masdeux, Joseph C, McGinnis, Scott, Mendez, Mario, Onyike, Chiadi, Pascual, M Belen, Pressman, Peter, Rademakers, Rosa, Wise, Amy, Ramanan, Vijay, Ritter, Aaron, Seeley, William W, Syrjanen, Jeremy, Taylor, Jack C, Weintraub, Sandra, Esteve, Aitana Sogorb, Nelson, Annabel, Greaves, Caroline V, Thomas, David L, Ong, Elise, Benotmane, Hanya, Zetterberg, Henrik, Nicholas, Jennifer, Samra, Kiran, Shafei, Rachelle, Timberlake, Carolyn, Cope, Thomas, Rittman, Timothy, Benussi, Alberto, Premi, Enrico, Forsberg, Leah, Gasparotti, Roberto, Archetti, Silvana, Gazzina, Stefano, Cantoni, Valentina, Arighi, Andrea, Fenoglio, Chiara, Scarpini, Elio, Fumagalli, Giorgio, Borracci, Vittoria, Rossi, Giacomina, Brushaber, Danielle, Giaccone, Giorgio, Di Fede, Giuseppe, Caroppo, Paola, Prioni, Sara, Redaelli, Veronica, Tang-Wai, David, Rogaeva, Ekaterina, Castelo-Branco, Miguel, Freedman, Morris, Keren, Ron, Rojas, Julio C, Black, Sandra, Mitchell, Sara, Shoesmith, Christen, Bartha, Robart, Poos, Jackie, Papma, Janne M, Giannini, Lucia, van Minkelen, Rick, Pijnenburg, Yolande, Nacmias, Benedetta, VandeVrede, Lawren, Ferrari, Camilla, Polito, Cristina, Lombardi, Gemma, Bessi, Valentina, Veldsman, Michele, Andersson, Christin, Thonberg, Hakan, Öijerstedt, Linn, Jelic, Vesna, Thompson, Paul, Ljubenkov, Peter, Lladó, Albert, Antonell, Anna, Olives, Jaume, Balasa, Mircea, Bargalló, Nuria, Borrego-Ecija, Sergi, Verdelho, Ana, Maruta, Carolina, Ferreira, Catarina B, Miltenberger, Gabriel, Wendelberger, Barbara, Kramer, Joel, Simões do Couto, Frederico, Gabilondo, Alazne, Gorostidi, Ana, Villanua, Jorge, Cañada, Marta, Tainta, Mikel, Zulaica, Miren, Barandiaran, Myriam, Alves, Patricia, Bender, Benjamin, Casaletto, Kaitlin B, Wilke, Carlo, Graf, Lisa, Vogels, Annick, Vandenbulcke, Mathieu, Van Damme, Philip, Bruffaerts, Rose, Poesen, Koen, Rosa-Neto, Pedro, Gauthier, Serge, Camuzat, Agnès, Appleby, Brian, Brice, Alexis, Bertrand, Anne, Funkiewiez, Aurélie, Rinaldi, Daisy, Saracino, Dario, Colliot, Olivier, Sayah, Sabrina, Prix, Catharina, Wlasich, Elisabeth, Wagemann, Olivia, Bordelon, Yvette, Loosli, Sandra, Schönecker, Sonja, Hoegen, Tobias, Lombardi, Jolina, Anderl-Straub, Sarah, Rollin, Adeline, Kuchcinski, Gregory, Bertoux, Maxime, Lebouvier, Thibaud, Deramecourt, Vincent, Botha, Hugo, Santiago, Beatriz, Duro, Diana, Leitão, Maria João, Almeida, Maria Rosario, Tábuas-Pereira, Miguel, Afonso, Sónia, Dickerson, Bradford C, Domoto-Reilly, Kimiko, Fields, Julie A, Foroud, Tatiana, Gavrilova, Ralitza, Heuer, Hilary W, Geschwind, Daniel, Ghoshal, Nupur, Goldman, Jill, Graff-Radford, Jonathon, Graff-Radford, Neill, Grossman, Murray, Hall, Matthew G H, Hsiung, Ging-Yuek, Huey, Edward D, Irwin, David, Russell, Lucy L, Jones, David T, Kantarci, Kejal, Kaufer, Daniel, Knopman, David S, Kremers, Walter, Lago, Argentina Lario, Lapid, Maria I, Litvan, Irene, Lucente, Diane, Mackenzie, Ian R, Cobigo, Yann, Mendez, Mario F, Mester, Carly, Miller, Bruce L, Onyike, Chiadi U, Ramanan, Vijay K, Ramos, Eliana Marisa, Rao, Meghana, Rascovsky, Katya, Rankin, Katherine P, Wolf, Amy, Roberson, Erik D, Savica, Rodolfo, Tartaglia, M Carmela, Wong, Bonnie, Cash, David M, Bouzigues, Arabella, Swift, Imogen J, Peakman, Georgia, Bocchetta, Martina, Goh, Sheng-Yang Matt, Todd, Emily G, Convery, Rhian S, Rowe, James B, Borroni, Barbara, Galimberti, Daniela, Tiraboschi, Pietro, Masellis, Mario, Finger, Elizabeth, van Swieten, John C, Seelaar, Harro, Petrucelli, Leonard, Jiskoot, Lize C, Sorbi, Sandro, Butler, Chris R, Graff, Caroline, Gerhard, Alexander, Langheinrich, Tobias, Laforce, Robert, Sanchez-Valle, Raquel, de Mendonça, Alexandre, Moreno, Fermin, Gendron, Tania F, Synofzik, Matthis, Vandenberghe, Rik, Ducharme, Simon, Le Ber, Isabelle, Levin, Johannes, Danek, Adrian, Otto, Markus, Pasquier, Florence, Santana, Isabel, Kornak, John, Frontotemporal Dementia Prevention Initiative (FPI) Investigators, and Neurology
- Subjects
Clinical Trials as Topic ,C9orf72 Protein ,biomarkers ,genetics [Mutation] ,tau Proteins ,General Medicine ,Article ,General Biochemistry, Genetics and Molecular Biology ,genetics [tau Proteins] ,Chemistry ,Frontotemporal Dementia ,Mutation ,Disease Progression ,Humans ,ddc:610 ,Human medicine ,genetics [C9orf72 Protein] ,genetics [Frontotemporal Dementia] ,Biology ,Biomarkers ,dementia - Abstract
Data availability: The datasets analyzed for the current study reflect collaborative efforts of two research consortia: ALLFTD and GENFI. Each consortium provides clinical data access based on established policies for data use: processes for request are available for review at allftd.org/data for ALLFTD data and by emailing genfi@ucl.ac.uk. Certain data elements from both consortia (for example raw MRI images) may be restricted due to the potential for identifiability in the context of the sensitive nature of the genetic data. The deidentified combined dataset will be available for request through the FTD Prevention Initiative in 2023 (https://www.thefpi.org/). Code availability: Custom R code is available at https://doi.org/10.5281/zenodo.6687486. Copyright © The Author(s). Unlike familial Alzheimer’s disease, we have been unable to accurately predict symptom onset in presymptomatic familial frontotemporal dementia (f-FTD) mutation carriers, which is a major hurdle to designing disease prevention trials. We developed multimodal models for f-FTD disease progression and estimated clinical trial sample sizes in C9orf72, GRN and MAPT mutation carriers. Models included longitudinal clinical and neuropsychological scores, regional brain volumes and plasma neurofilament light chain (NfL) in 796 carriers and 412 noncarrier controls. We found that the temporal ordering of clinical and biomarker progression differed by genotype. In prevention-trial simulations using model-based patient selection, atrophy and NfL were the best endpoints, whereas clinical measures were potential endpoints in early symptomatic trials. f-FTD prevention trials are feasible but will likely require global recruitment efforts. These disease progression models will facilitate the planning of f-FTD clinical trials, including the selection of optimal endpoints and enrollment criteria to maximize power to detect treatment effects. Data collection and dissemination of the data presented in this paper were supported by the ALLFTD Consortium (U19: AG063911, funded by the National Institute on Aging and the National Institute of Neurological Diseases and Stroke) and the former ARTFL and LEFFTDS Consortia (ARTFL: U54 NS092089, funded by the National Institute of Neurological Diseases and Stroke and National Center for Advancing Translational Sciences; LEFFTDS: U01 AG045390, funded by the National Institute on Aging and the National Institute of Neurological Diseases and Stroke). The manuscript was reviewed by the ALLFTD Executive Committee for scientific content. The authors acknowledge the invaluable contributions of the study participants and families as well as the assistance of the support staffs at each of the participating sites. This work is also supported by the Association for Frontotemporal Degeneration (including the FTD Biomarkers Initiative), the Bluefield Project to Cure FTD, Larry L. Hillblom Foundation (2018-A-025-FEL (A.M.S.)), the National Institutes of Health (AG038791 (A.L.B.), AG032306 (H.J.R.), AG016976 (W.K.), AG062677 (Ron C. Peterson), AG019724 (B.L.M.), AG058233 (Suzee E. Lee), AG072122 (Walter Kukull), P30 AG062422 (B.L.M.), K12 HD001459 (N.G.), K23AG061253 (A.M.S.), AG062422 (RCP), K24AG045333 (H.J.R.)) and the Rainwater Charitable Foundation. Samples from the National Centralized Repository for Alzheimer Disease and Related Dementias (NCRAD), which receives government support under a cooperative agreement grant (U24 AG021886 (T.F.)) awarded by the National Institute on Aging (NIA), were used in this study. This work was also supported by Medical Research Council UK GENFI grant MR/M023664/1 (J.D.R.), the Bluefield Project, the National Institute for Health Research including awards to Cambridge and UCL Biomedical Research Centres and a JPND GENFI-PROX grant (2019–02248). Several authors of this publication are members of the European Reference Network for Rare Neurologic Diseases, project 739510. J.D.R. and L.L.R. are also supported by the National Institute for Health and Care Research (NIHR) UCL/H Biomedical Research Centre, the Leonard Wolfson Experimental Neurology Centre Clinical Research Facility and the UK Dementia Research Institute, which receives its funding from UK DRI Ltd, funded by the UK Medical Research Council, Alzheimer’s Society and Alzheimer’s Research UK. J.D.R. is also supported by the Miriam Marks Brain Research UK Senior Fellowship and has received funding from an MRC Clinician Scientist Fellowship (MR/M008525/1) and the NIHR Rare Disease Translational Research Collaboration (BRC149/NS/MH). M.B. is supported by a Fellowship award from the Alzheimer’s Society, UK (AS-JF-19a-004-517). RC and C.G. are supported by a Frontotemporal Dementia Research Studentships in Memory of David Blechner funded through The National Brain Appeal (RCN 290173). J.B.R. is supported by NIHR Cambridge Biomedical Research Centre (BRC-1215-20014; the views expressed are those of the authors and not necessarily those of the NIHR or the Department of Health and Social Care), the Wellcome Trust (220258), the Cambridge Centre for Parkinson-plus and the Medical Research Council (SUAG/092 G116768); I.L.B. is supported by ANR-PRTS PREV-DemAls, PHRC PREDICT-PGRN, and several authors of this publication are members of the European Reference Network for Rare Neurological Diseases (project 739510). J.L. is funded by the Deutsche Forschungsgemeinschaft (German Research Foundation) under Germany’s Excellence Strategy within the framework of the Munich Cluster for Systems Neurology (EXC 2145 SyNergy – ID 390857198). R.S.-V. was funded at the Hospital Clinic de Barcelona by Instituto de Salud Carlos III, Spain (grant code PI20/00448 to RSV) and Fundació Marató TV3, Spain (grant code 20143810 to R.S.-V.). M.M. was, in part, funded by the UK Medical Research Council, the Italian Ministry of Health and the Canadian Institutes of Health Research as part of a Centres of Excellence in Neurodegeneration grant, by Canadian Institutes of Health Research operating grants (MOP- 371851 and PJT-175242) and by funding from the Weston Brain Institute. R.L. is supported by the Canadian Institutes of Health Research and the Chaire de Recherche sur les Aphasies Primaires Progressives Fondation Famille Lemaire. C.G. is supported by the Swedish Frontotemporal Dementia Initiative Schörling Foundation, Swedish Research Council, JPND Prefrontals, 2015–02926,2018–02754, Swedish Alzheimer Foundation, Swedish Brain Foundation, Karolinska Institutet Doctoral Funding, KI Strat-Neuro, Swedish Dementia Foundation, and Stockholm County Council ALF/Region Stockholm. J.L. is supported by Germany’s Excellence Strategy within the framework of the Munich Cluster for Systems Neurology (German Research Foundation, EXC 2145 Synergy 390857198). The Dementia Research Centre is supported by Alzheimer’s Research UK, Alzheimer’s Society, Brain Research UK, and The Wolfson Foundation. This work was supported by the National Institute for Health Research UCL/H Biomedical Research Centre, the Leonard Wolfson Experimental Neurology Centre Clinical Research Facility and the UK Dementia Research Institute, which receives its funding from UK DRI Ltd, funded by the UK Medical Research Council, Alzheimer’s Society, and Alzheimer’s Research UK.
- Published
- 2022
11. Visualizations in Popular Books About Chemistry
- Author
-
Gilbert, John K., Afonso, Ana, Gilbert, J.K., Series editor, Eilam, Billie, editor, and Gilbert, John K., editor
- Published
- 2014
- Full Text
- View/download PDF
12. Dichloro Butenediamides as Irreversible Site‐Selective Protein Conjugation Reagent
- Author
-
Gonçalo J. L. Bernardes, Alexander Adibekian, Esther M. Martin, Francisco Corzana, Cláudia F. Afonso, Daniel Abegg, Victor Laserna, Peter Ravn, Afonso, Cláudia F [0000-0003-4228-8834], Bernardes, Gonçalo JL [0000-0001-6594-8917], Apollo - University of Cambridge Repository, Repositório da Universidade de Lisboa, Afonso, Cláudia F. [0000-0003-4228-8834], and Bernardes, Gonçalo J. L. [0000-0001-6594-8917]
- Subjects
Models, Molecular ,Irreversibility ,Kinetics ,Protein Labelling | Hot Paper ,010402 general chemistry ,01 natural sciences ,Catalysis ,Maleimides ,Hydrolysis ,Michael addition ,Humans ,Cysteine ,Research Articles ,Diamide ,Bioconjugation ,Molecular Structure ,34 Chemical Sciences ,010405 organic chemistry ,Chemistry ,Proteins ,3405 Organic Chemistry ,General Medicine ,General Chemistry ,Combinatorial chemistry ,0104 chemical sciences ,Reagent ,Michael reaction ,Generic health relevance ,Selectivity ,Conjugate ,Research Article - Abstract
© 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited., We describe maleic-acid derivatives as robust cysteine-selective reagents for protein labelling with comparable kinetics and superior stability relative to maleimides. Diamide and amido-ester derivatives proved to be efficient protein-labelling species with a common mechanism in which a spontaneous cyclization occurs upon addition to cysteine. Introduction of chlorine atoms in their structures triggers ring hydrolysis or further conjugation with adjacent residues, which results in conjugates that are completely resistant to retro-Michael reactions in the presence of biological thiols and human plasma. By controlling the microenvironment of the reactive site, we can control selectivity towards the hydrolytic pathway, forming homogeneous conjugates. The method is applicable to several scaffolds and enables conjugation of different payloads. The synthetic accessibility of these reagents and the mild conditions required for fast and complete conjugation together with the superior stability of the conjugates make this strategy an important alternative to maleimides in bioconjugation., This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement N° 836698 and under grant agreement N° 852985. Funding from the Scripps Research Institute (A.A.), FCT Portugal (PhD scholarship PD/BD/135512/2018 to C.F.A. and FCT Stimulus CEECIND/00453/2018 to G.J.L.B.) and Agencia Estatal Investigación of Spain (AEI; Grant RTI2018-099592-B-C21 to F.C.) is also acknowledged.
- Published
- 2021
13. Impact of physical activity on redox status and nitric oxide bioavailability in nonoverweight and overweight/obese prepubertal children
- Author
-
Manuela Morato, Liane Correia-Costa, Teresa Sousa, Joana Afonso, Alberto Caldas Afonso, Laura Leite-Almeida, António Guerra, António Albino-Teixeira, José Carlos Areias, Dina Cosme, and Instituto de Saúde Pública da Universidade do Porto
- Subjects
0301 basic medicine ,medicine.medical_specialty ,Urinary system ,Biological Availability ,Physical exercise ,Overweight ,Nitric Oxide ,Biochemistry ,Childhood obesity ,Body Mass Index ,Nitric oxide ,Cohort Studies ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Physiology (medical) ,Internal medicine ,Bayesian multivariate linear regression ,Humans ,Medicine ,Obesity ,Child ,Exercise ,Physical activity ,business.industry ,Hydrogen Peroxide ,Cardiometabolic risk factors ,medicine.disease ,Antioxidant capacity ,Bioavailability ,Cross-Sectional Studies ,030104 developmental biology ,Endocrinology ,chemistry ,Oxidative stress ,medicine.symptom ,business ,Oxidation-Reduction ,030217 neurology & neurosurgery ,Cohort study - Abstract
Nutritional status might contribute to variations induced by physical activity (PA) in redox status biomarkers. We investigated the influence of PA on redox status and nitric oxide (NO) production/metabolism biomarkers in nonoverweight and overweight/obese prepubertal children. We performed a cross-sectional evaluation of 313 children aged 8-9 years (163 nonoverweight, 150 overweight/obese) followed since birth in a cohort study (Generation XXI, Porto, Portugal). Plasma total antioxidant status (P-TAS), plasma and urinary isoprostanes (P-Isop, U-Isop), urinary hydrogen peroxide (U-H2O2), myeloperoxidase (MPO) and plasma and urinary nitrates and nitrites (P-NOx, U-NOx) were assessed, as well as their association with variables of reported PA quantification (categories of PA frequency (>1x/week and ≤1x/week)and continuous PA index (obtained by the sum of points)) in a questionnaire with increasing ranks from sedentary to vigorous activity levels. U-NOx was significantly higher in children who presented higher PA index scores and higher PA frequency. Separately by BMI classes, U-NOx was significantly higher only in nonoverweight children who practiced PA more frequently (p = 0.037). In overweight/obese children, but not in nonoverweight, P-TAS was higher among children with higher PA frequency (p = 0.007). Homeostasis model assessment index (HOMA-IR) was significantly lower in more active overweight/obese children, but no differences were observed in nonoverweight children. In the fully adjusted multivariate linear regression models for P-TAS, in the overweight/obese group, children with higher PA frequency presented higher P-TAS. In the U-NOx models, U-NOx significantly increased with PA index, only in nonoverweight children. Our results provide additional evidence in support of a protective effect of physical activity, in nonoverweight by increasing NO bioavailability and in overweight/obese children by enhancing systemic antioxidant capacity and insulin sensitivity. These results highlight the importance of engaging in regular physical exercise, particularly among overweight/obese children, in which a positive association between oxidant status and cardiometabolic risk markers has been described. This project was supported by FEDER funds from Programa Operacional Factores de Competitividade – COMPETE [FCOMP-01-0124-FEDER-028751], by national funds from the Portuguese Foundation for Science and Technology (FCT), Lisbon, Portugal [PTDC/DTP-PIC/0239/2012] and by Calouste Gulbenkian Foundation. Liane Correia-Costa was supported by FCT [SFRH/SINTD/95898/2013] and Teresa Sousa was supported by FCT and POPH/FSE (EC) [Ciência 2008 and SFRH/BPD/112005].
- Published
- 2021
14. Insecticidal activity of the essential oil of <scp> Piper corcovadensis </scp> leaves and its major compound (1‐butyl‐3,4‐methylenedioxybenzene) against the maize weevil, <scp> Sitophilus zeamais </scp>
- Author
-
Júlio César Ribeiro de Oliveira Farias de Aguiar, Afonso Cordeiro Agra-Neto, Suyana Karolyne Lino da Rocha, Thiago Henrique Napoleão, Bheatriz Nunes de Lima Albuquerque, Patrícia Maria Guedes Paiva, Camila Soledade de Lira Pimentel, Remi Bellon, Alana Bittencourt Vieira da Silva, André Severino da Silva, Daniela Maria do Amaral Ferraz Navarro, and Jefferson L. Princival
- Subjects
Piper ,biology ,Chemistry ,Sitophilus ,Lethal dose ,Fumigation ,General Medicine ,Piperaceae ,biology.organism_classification ,law.invention ,Toxicology ,Maize weevil ,law ,Insect Science ,PEST analysis ,Agronomy and Crop Science ,Essential oil - Abstract
BACKGROUND Sitophilus zeamais is one of the most economically impactful pests, attacking various grains and processed foods. Control of this insect has been achieved using synthetic insecticides, exacerbated and careless use of which has led to the development of resistant insect populations, toxicity to non-target organisms and environmental contamination. In this study, Piper corcovadensis leaf essential oil (PcLEO) and its major compound, 1-butyl-3,4-methylenedioxybenzene (BMDB), were investigated as alternative insecticidal agents against S. zeamais. RESULTS Characterization of PcLEO showed the presence of 40 compounds. The major components were the phenylpropanoid BMDB (35.77%) and the monoterpenes α-pinene (14.95%) and terpinolene (6.23%). PcLEO and BMDB were toxic by fumigation (half-maximal lethal concentration [LC50 ]: 9.46 and 0.85 μl L-1 of air, respectively), by contact (half-maximal lethal dose [LD50 ]: 9.38 and 6.16 μg g-1 of insect, respectively) and ingestion (LC50 : 16.04 and 14.30 mg g-1 , respectively). In the ingestion test, both PcLEO and BMDB promoted the loss of insect biomass and had a strong deterrent effect. In addition, both were able to inhibit trypsin and α-amylase activities. CONCLUSION PcLEO and BMDB exhibited insecticidal activity against S. zeamais, with a toxic effect by fumigation, contact and ingestion, in addition to food deterrence and inhibiting trypsin and α-amylase activities, suggesting their potential for use in the control of this pest.
- Published
- 2021
15. An Environmentally Friendly Three-Dimensional Printed Graphene-Integrated Polylactic Acid Electrochemical Sensor for the Quality Control of Biofuels
- Author
-
Tiago A. Matias, Afonso F. João, Raquel M. F. Sousa, Rodrigo A.A. Munoz, Robson R. Guimaraes, and Jéssica S. Gomes
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Graphene ,General Chemical Engineering ,media_common.quotation_subject ,Nanotechnology ,General Chemistry ,Environmentally friendly ,Electrochemical gas sensor ,law.invention ,chemistry.chemical_compound ,Polylactic acid ,chemistry ,Biofuel ,law ,Environmental Chemistry ,Quality (business) ,media_common - Published
- 2021
16. Chemical Fingerprint of Non-aged Artisanal Sugarcane Spirits Using Kohonen Artificial Neural Network
- Author
-
Mauricio Xavier Coutrim, Sandra Regina Gregório, Débora Faria Silva, Clara Mariana Gonçalves Lima, Guilherme de Souza Hassemer, Daniela Caetano, Ananda Lima Sanson, Gaber El-Saber Batiha, Gilmare Antônia da Silva, Jesus Simal-Gandara, Silvani Verruck, and Robson José de Cássia Franco Afonso
- Subjects
Self-organizing map ,Artificial neural network ,Chemistry ,3309.01 Bebidas Alcohólicas ,Applied Microbiology and Biotechnology ,Analytical Chemistry ,Fingerprint ,Principal component analysis ,Alcohol content ,Food science ,Safety, Risk, Reliability and Quality ,Safety Research ,3303.03 Procesos Químicos ,Food Science - Abstract
This study focuses on the determination of the chemical profile of 24 non-aged Brazilian artisanal sugarcane spirits (cachaça) samples through chromatographic quantification and chemometric treatment via principal component analysis (PCA) and Kohonen’s neural network. In total, forty-seven (47) chemical compounds were identified in the samples of non-aged artisanal cachaça, in addition to determining alcohol content, volatile acidity, and copper. For the PCA of the chemical compounds’ profile, it could be observed that the samples were grouped into seven groups. On the other hand, the variables’ bearings were grouped together, making it difficult to separate the components in relation to the sample groups and reducing the chances of obtaining all the necessary information. However, by using a Kohonen’s neural network, samples were grouped into eight groups. This tool proved to be more accurate in the groups’ formation. Among the chemical classes of the compounds observed, esters stood out, followed by alcohols, acids, aldehydes, ketones, phenol, and copper. The abundance of esters in these samples may suggest that these compounds would be part of the regional standard for cachaças produced in the region of Salinas, Minas Gerais.
- Published
- 2021
17. Double-sided self-pierce riveting with flat-bottom holes: a feasibility study
- Author
-
Luis M. Alves, Rafael M. Afonso, Paulo A.F. Martins, and Patric T. Pereira
- Subjects
Shear (sheet metal) ,Materials science ,chemistry ,Aluminium ,business.industry ,Mechanical Engineering ,Mechanical strength ,Rivet ,chemistry.chemical_element ,Structural engineering ,business ,Industrial and Manufacturing Engineering ,Finite element method - Abstract
This paper is focused on solving the problems of positioning and alignment of rivets in double-sided self-pierce riveting by means of flat-bottom holes that are previously machined in the overlapped sheets with greater mechanical strength. The work combines experimentation in joints made from dissimilar materials (aluminium AA5754-H111 and polyvinylchloride) with finite element modelling to investigate the influence of the flat-bottom hole geometry in the overall joining mechanisms. It is shown that the use of flat hole-bottom holes with rivets having identical chamfered angles in both ends is unable to create undercuts and to produce form-closed mechanical interlockings. Undercuts are created if different chamfered angles in the rivet ends are introduced to compensate the greater or lesser difficulty of the rivets to pierce through sheets with different mechanical strengths. Destructive shear and peel tests performed with different types of joints confirm the good performance of the joints produced by double-sided self-pierce riveting with flat-bottom holes.
- Published
- 2021
18. Non‐invasive and non‐destructive Raman spectroscopic characterization of some Brazilian ethnographic resins
- Author
-
Dalva Lúcia Araújo de Faria, Silvia Cunha Lima, Howell G. M. Edwards, Marta S. Maier, Sara D. Parera, and Marisa Coutinho Afonso
- Subjects
symbols.namesake ,Chemistry ,Non destructive ,Non invasive ,symbols ,General Materials Science ,ACERVO MUSEOLÓGICO ,Raman spectroscopy ,Spectroscopy ,Nuclear chemistry ,Characterization (materials science) - Published
- 2021
19. Surgery for Obesity and Weight-Related Diseases Changes the Inflammatory Profile in Women with Severe Obesity: a Randomized Controlled Clinical Trial
- Author
-
João Pedro Ribeiro Afonso, André Luis Lacerda Bachi, Luis Vicente Franco de Oliveira, Manoel Carneiro Oliveira Junior, Adriano Luís Fonseca, Miriã Cândida Oliveira, Marcos Mota da Silva, Rodolfo de Paula Vieira, Vera Lúcia dos Santos Alves, Wilson José Sena Pedro, Alan Robson Trigueiro de Sousa, Elias Jirjoss Ilias, Carlos Alberto Malheiros, Anderson Soares da Silva, Eduardo Araujo Perez, Giuseppe Insalaco, Wilson Rodrigues de Freitas Junior, and Maria Eduarda Moreira Lino
- Subjects
medicine.medical_specialty ,Endocrinology, Diabetes and Metabolism ,Bariatric Surgery ,Adipokine ,chemistry.chemical_compound ,Adipokines ,Weight loss ,Weight Loss ,medicine ,Humans ,Obesity ,Inflammation ,Nutrition and Dietetics ,medicine.diagnostic_test ,Cholesterol ,business.industry ,medicine.disease ,Pathophysiology ,Obesity, Morbid ,Surgery ,Clinical trial ,chemistry ,Female ,Resistin ,medicine.symptom ,Severe obesity ,business ,Lipid profile - Abstract
Introduction/Purpose Obesity increases significantly every year worldwide. Since 1980, the prevalence of individuals with obesity has practically doubled. Obesity plays an important role in the pathophysiology of diseases that arise from a complex interaction of nutritional, genetic, and metabolic factors, characterizing a chronic inflammatory state. This study aimed to verify the systemic inflammatory response through the analysis of IGF-1, IL-23, and resistin levels and the lipid profile in severely obese women undergoing surgery for obesity and weight-related diseases. Materials and Methods This randomized controlled clinical trial includes female patients clinically diagnosed with severe obesity with an indication for bariatric surgery. Results In the initial evaluation, no significant difference was observed between the control (CG) and bariatric surgery (BSG) groups. The weight, BMI, systolic and diastolic blood pressures, total cholesterol, LDL, HDL, total non-HDL cholesterol, and glucose in BSG patients showed a significant change after surgery. Pre- and post-surgery levels of resistin, IGF-1, and IL-23 showed a significant difference in the BSG group, but only IL-23 was changed after 6 months in the CG. Conclusion The results of this study confirmed that weight loss induced by surgery for obesity and weight-related diseases improved the lipid profile and reduced the chronic inflammatory status in women with severe obesity.
- Published
- 2021
20. Molecular Characterization of a Mixed Plastic Pyrolysis Oil from Municipal Wastes by Direct Infusion Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
- Author
-
Benoit Paupy, Carlos Afonso, Charlotte Mase, Mathilde Farenc, Julien Maillard, Marie Hubert-Roux, Pierre Giusti, and Cindy Adam
- Subjects
Materials science ,020209 energy ,General Chemical Engineering ,Analytical chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Fourier transform ion cyclotron resonance ,Characterization (materials science) ,chemistry.chemical_compound ,Fuel Technology ,chemistry ,Pyrolysis oil ,0202 electrical engineering, electronic engineering, information engineering ,0210 nano-technology - Published
- 2021
21. Effects of Plectranthus barbatus leaf extract on survival, digestive proteases, midgut morphophysiology and gut microbiota homeostasis of Aedes aegypti larvae
- Author
-
Luana Cassandra Breitenbach Barroso Coelho, Luiz Alberto Lira Soares, Maiara Celine de Moura, Patrícia Maria Guedes Paiva, Magda Rhayanny Assunção Ferreira, Afonso Cordeiro Agra-Neto, Glaucilane dos Santos Cruz, Lidiane Pereira de Albuquerque, Jéssica da Silva Nascimento, Welton Aaron de Almeida, Hilton Nobre da Costa, Thiago Henrique Napoleão, DanielaAmaral Ferraz MariaNavarro, Valéria Wanderley-Teixeira, Emmanuel Viana Pontual, Isabella Coimbra Vila Nova, and Álvaro Aguiar Coelho Teixeira
- Subjects
0106 biological sciences ,Proteases ,biology ,Trypsin inhibitor ,fungi ,Lectin ,Midgut ,Plant Science ,Aedes aegypti ,biology.organism_classification ,Trypsin ,01 natural sciences ,0104 chemical sciences ,Microbiology ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,chemistry ,Plectranthus barbatus ,Caffeic acid ,biology.protein ,medicine ,010606 plant biology & botany ,medicine.drug - Abstract
Aedes aegypti can transmit dengue, chikungunya, zika and yellow fever. Its control represents the main strategy for reducing the spreading of these diseases. In the present work, Plectranthus barbatus leaf saline extract (SE), decoction and infusion were studied for their effects on the survival of A. aegypti third instar larvae (L3), as well as for the presence of secondary metabolites, lectins, and trypsin inhibitors. The effects of SE (non-heated or heated) on digestive proteases, permeability of peritrophic membrane, morphophysiology, microbiota growth and melanogenesis of L3 are reported. SE killed L3 (LC50 of 0.48%, w/v), while decoction and infusion were not larvicides. HPLC analysis identified caffeic acid and flavonoids in SE, decoction, and infusion. SE also contained a ribose/galactose-binding lectin, trypsin inhibitor activities and polypeptides (34, 63 and 66 kDa) resistant to hydrolysis by L3 gut proteases. The incubation of SE with larval proteases did not alter lectin and trypsin inhibitor activities. Treatment of L3 with SE (at LC50) increased the permeability of peritrophic membrane and prevented the larvae from passing into the fourth instar. The morphology of larval midgut was not affected by SE, but the content of neutral polysaccharides in epithelial cells was reduced. SE stimulated in vitro the proliferation of L3 midgut microbiota and increased in vivo the production of melanin by larvae. The heating (100°C, 5 h) of SE increased lectin, trypsin inhibitor and larvicidal activities. In conclusion, SE larvicidal activity may be linked to the presence of lectin and trypsin inhibitor and involves the inhibition of digestive proteases, damage to larval midgut morphophysiology and induction of dysbiosis.
- Published
- 2021
22. Effect of the Ionization Source on the Targeted Analysis of Nickel and Vanadyl Porphyrins in Crude Oil
- Author
-
Marianny Y. Combariza, Cristian Blanco-Tirado, Carlos Afonso, Marie Hubert-Roux, Pierre Giusti, and Juan S. Ramírez-Pradilla
- Subjects
Nickel ,Fuel Technology ,Materials science ,chemistry ,General Chemical Engineering ,Ionization ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Crude oil ,Nuclear chemistry - Published
- 2021
23. Characterization of Heavy Products from Lignocellulosic Biomass Pyrolysis by Chromatography and Fourier Transform Mass Spectrometry: A Review
- Author
-
Carlos Afonso, Caroline Barrère-Mangote, Charlotte Mase, Marie Hubert-Roux, Pierre Giusti, and Jasmine Hertzog
- Subjects
Fuel Technology ,Chromatography ,High oxygen ,Chemistry ,General Chemical Engineering ,Energy Engineering and Power Technology ,Lignocellulosic biomass ,Pyrolysis ,Fourier transform ion cyclotron resonance ,Characterization (materials science) ,Corrosion - Abstract
Bio-oils obtained from lignocellulosic biomass pyrolysis are promising energetic resources. However, their high oxygen content is responsible for storage and corrosion issues and does not allow the...
- Published
- 2021
24. Advances and Challenges in the Molecular Characterization of Petroporphyrins
- Author
-
Marianny Y. Combariza, Pierre Giusti, Carlos Afonso, Germain Vallverdu, Martha L. Chacón-Patiño, Amy M. McKenna, Brice Bouyssiere, Quan Shi, Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), National High Magnetic Field Laboratory (NHMFL), and Florida State University [Tallahassee] (FSU)
- Subjects
Chemistry ,General Chemical Engineering ,FT-ICR MS ,Energy Engineering and Power Technology ,Molecular evidence ,petroporphyrins ,02 engineering and technology ,Computational biology ,geoporphyrins ,010402 general chemistry ,021001 nanoscience & nanotechnology ,asphaltenes ,01 natural sciences ,Petroleum biomarkers ,0104 chemical sciences ,Fuel Technology ,[CHIM.ANAL]Chemical Sciences/Analytical chemistry ,vanadyl porphyrins ,nickel porphyrins ,0210 nano-technology ,ComputingMilieux_MISCELLANEOUS ,mass spectrometry - Abstract
International audience; Petroporphyrins, geoporphyrins, or metalloporphyrins are the original petroleum biomarkers, identified by Alfred Treibs more than a century ago and the first molecular evidence for the biogenic origins of petroleum. Since discovery, analytical strategies have been developed to identify porphyrins in petroleum and its fractions. This review focuses on the advances enabled by ultrahigh resolving power Fourier transform ion cyclotron resonance mass spectrometry in tribute to Professor Alan G. Marshall.
- Published
- 2021
25. Production and bioaccessibility of Emiliania huxleyi biomass and bioactivity of its aqueous and ethanolic extracts
- Author
-
B. Vicente, A. Amorim, T. T. M. S. Rodrigues, Cláudia Afonso, M. Sapatinha, Narcisa M. Bandarra, Joana Matos, Carlos Cardoso, and R. Gomes
- Subjects
chemistry.chemical_classification ,Alkenone ,ABTS ,Antioxidant ,biology ,Chemistry ,DPPH ,medicine.medical_treatment ,Fatty acid ,Plant Science ,Aquatic Science ,biology.organism_classification ,chemistry.chemical_compound ,Dry weight ,medicine ,Food science ,Polyunsaturated fatty acid ,Emiliania huxleyi - Abstract
The coccolithophore Emiliania huxleyi (Lohmann) W.W. Hay & H.P. Mohler has been receiving ever increasing attention as a result of its bioactivity potential. A strain of E. huxleyi recently isolated from Portuguese coastal waters (NE Atlantic) was cultivated under controlled laboratory conditions and the attained biomass was biochemically characterized (fatty acid (FA) profile, total phenolic and alkenone contents) and its bioactivity measured (antioxidant and anti-inflammatory properties). Moreover, bioaccessibility of selected constituents and bioactivities was assessed. A total dry weight of 556 mg L−1 was attained. The biomass was characterized by a large polyunsaturated fatty acids (PUFA) share of the total FA, 60.8 ± 1.8%, followed by saturated fatty acids (SFA), 22.8 ± 1.0%, and monounsaturated fatty acids (MUFA), 15.9 ± 0.7%. Furthermore, an ω3/ω6 ratio of 37 was calculated. The daily amount of freeze-dried E. huxleyi required to meet the EPA + DHA recommended daily intake (RDI) was 19.9 g. As to the phenolic content, both extracts had similar values, reaching 435.5–465.4 mg GAE (100 g dw)−1. Substantial antioxidant activity as measured by DPPH (2,2-diphenyl-1-picrylhydrazyl), FRAP (ferric reducing antioxidant power), and ABTS (2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) was observed. The levels of anti-inflammatory activity were also substantial, 38 ± 4% and 85 ± 11% of COX-2 inhibition in the aqueous and ethanolic extracts, respectively. Moreover, it was observed that the C37:3, C37:2, and C38:2 alkenones were the most abundant, with values exceeding 500 mg (100 g dw)−1 and total alkenone content was approximately 2,500 mg (100 g dw)−1. The bioaccessibility of studied compounds and bioactivities was always low or even nonexistent/undetected. Therefore, future work should aim at microalgal extraction and processing for achieving higher bioaccessibility levels.
- Published
- 2021
26. Sentinel lymph node biopsy in patients with endometrial cancer and an indocyanine green or iodinated contrast reaction - A proposed management algorithm
- Author
-
Mario M. Leitao, Nadeem R. Abu-Rustum, Anoushka M. Afonso, William A. Zammarrelli, Jennifer J. Mueller, Amelia Chan, Vance Broach, Oliver Zivanovic, and Yukio Sonoda
- Subjects
Adult ,Indocyanine Green ,0301 basic medicine ,medicine.medical_specialty ,genetic structures ,Premedication ,Sentinel lymph node ,Contrast Media ,Article ,Drug Hypersensitivity ,Young Adult ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Iodinated contrast ,Anti-Allergic Agents ,Biopsy ,Humans ,Medicine ,Prospective Studies ,Adverse effect ,Aged ,Retrospective Studies ,Aged, 80 and over ,medicine.diagnostic_test ,Sentinel Lymph Node Biopsy ,business.industry ,Incidence ,Endometrial cancer ,Diphenhydramine ,Obstetrics and Gynecology ,Middle Aged ,medicine.disease ,eye diseases ,Endometrial Neoplasms ,body regions ,Administration, Intravaginal ,030104 developmental biology ,Oncology ,chemistry ,Lymphatic Metastasis ,030220 oncology & carcinogenesis ,Female ,Radiology ,Sentinel Lymph Node ,business ,Indocyanine green ,medicine.drug - Abstract
Objective To describe the incidence of adverse reactions to indocyanine green (ICG) administered during sentinel lymph node (SLN) biopsy for endometrial cancer, and to propose an ICG management algorithm for these patients. Methods All patients who underwent surgery for endometrial cancer with SLN biopsy using ICG from 1/2017 to 8/2020 were identified using a single-institution prospective database. Surgical adverse events (SAEs) related to the procedure were identified. A review of the literature was performed. Results In all, 1414 patients met inclusion criteria and were evaluated. Sixty-seven (4.7%) patients had a history of either an iodine or contrast allergy. No patients had a history of documented ICG allergy. Among patients with an iodine or contrast allergy, 65 (97%) received a corticosteroid with or without diphenhydramine prior to ICG administration. One hundred five patients (7.4%) experienced 116 SAEs. Among these patients, 3 experienced potentially allergic SAEs possibly related to ICG administration. After thorough chart review, however, the likelihood these SAEs were due to ICG appeared low. No patients experienced an anaphylactic response after ICG admission. Conclusion There were no anaphylactic reactions to ICG intracervical administration during 1414 consecutive SLN biopsies, including in patients with a documented iodine or contrast allergy. Intracervical injection of ICG is safe, and premedication using corticosteroids with or without diphenhydramine prior to SLN biopsy is a reasonable strategy in patients with iodinated contrast allergy.
- Published
- 2021
27. Removal of cephalexin and erythromycin antibiotics, and their resistance genes, by microalgae-bacteria consortium from wastewater treatment plant secondary effluents
- Author
-
Robson José de Cássia Franco Afonso, Aníbal da Fonseca Santiago, Camila Cristina Rodrigues Ferreira da Cunha, André Luis Corrêa de Barros, Daiana Rocha do Espirito Santo, Daniel Aparecido da Silva Rodrigues, Silvana de Queiroz Silva, and Andressa Rezende Pereira
- Subjects
medicine.drug_class ,Health, Toxicology and Mutagenesis ,Antibiotics ,Erythromycin ,Wastewater ,Water Purification ,Antibiotic resistance ,Bioremediation ,Microalgae ,medicine ,Environmental Chemistry ,Ecotoxicology ,Food science ,Effluent ,Cephalexin ,Bacteria ,biology ,Chemistry ,General Medicine ,biology.organism_classification ,Pollution ,Anti-Bacterial Agents ,Sewage treatment ,medicine.drug - Abstract
Antibiotics have become a concern in the aquatic environments owing to the potential development of bacterial resistances. Thus, this study evaluated the removal of cephalexin (CEP) and erythromycin (ERY) from a local wastewater treatment plant (WWTP) effluent, mediated by microalgae-bacteria consortium. Likewise, the removal of correlated antibiotics resistance genes blaTEM and ermB was also assessed. The incubation results showed that the added concentrations of selected antibiotics did not restrain the consortium growth. Moreover, CEP and ERY were almost completely removed after the cultivation period, reaching total removals of 96.54% and 92.38%, respectively. The symbiotic interaction between microalgae and bacteria plays a role in the kinetics removal of CEP and ERY. The abundance of blaTEM and ermB was reduced by 0.56 and 1.75 logs, respectively. Lastly, our results suggest that technology based on natural microalgae-bacteria consortium could be a potential alternative to improve the quality of WWTP effluents.
- Published
- 2021
28. Avaliação e composição nutricional de rações secas para cães adultos
- Author
-
Walber de Oliveira Rabelo, Natan de Souza Oliveira, Giovana Miranda de Almeida, Marcos Vinícius Ramos Afonso, Nathália Gonçalves de Jesus, and Ana Luíza Teixeira Amado Jorge
- Subjects
legislação ,Chemistry ,Veterinary medicine ,SF600-1100 ,General Medicine ,Food science ,rotulagem ,composição ,alimentação - Abstract
O Brasil é considerado o segundo maior produtor mundial de alimentos destinados a cães e gatos, ficando atrás apenas dos EUA. Esses são classificado de acordo com a própria indústria em segmentos comerciais, em econômico, standard, premium e super premium, diferindo quanto a matéria prima utilizada e composição nutricional, sendo o MAPA responsável por realizar a fiscalização dos mesmos. Os cães nos dias atuais desempenham papel como companhia, vínculo emocional, considerados por alguns como membros da família, aumentando assim o contato e convívio com os seres humanos. Todo esse contato gera por meio dos tutores, maior preocupação quanto à saúde, qualidade de vida e alimentação do seu animal. Desta forma, objetivou-se determinar a composição nutricional de rações secas para cães adultos, avaliando se as informações declaradas nos rótulos são condizentes com o apresentado pelas mesmas e se atendem as necessidades nutricionais dos cães. Foram adquiridas doze amostras de rações e classificadas de acordo com o fabricante em econômica, standard, premium e super premium. Cada segmento era composto por três rações de fabricantes distintos. Foi realizado análise bromatológica das mesmas, avaliando quanto ao teor de umidade, matéria mineral, proteína bruta, extrato etéreo e fibra bruta. Os resultados obtidos foram comparados com o valor observado e declarado pela fabricante, através de análise descritiva da média e desvio padrão. Todos os segmentos apresentaram diferenças significantes com relação ao demonstrado em rótulo, sendo o segmento econômico apresentou maiores diferenças entre o valor observado e o declarado no rótulo, seguido da linha super premium, premium e standard, respectivamente. Levando em consideração a legislação, o segmento econômico apresentou resultados que inviabilizam seu uso devido não atender as necessidades dos cães.
- Published
- 2021
29. Functionalized Cyclopentenones and an Oxime Ether as Antimicrobial Agents
- Author
-
Késsia Andrade, Rafael F. A. Gomes, Vera M. S. Isca, Carlos A. M. Afonso, and Patrícia Rijo
- Subjects
Methicillin-Resistant Staphylococcus aureus ,furfurals ,Cyclopentanes ,Microbial Sensitivity Tests ,Oxime ether ,Furfural ,Ether ,Biochemistry ,cyclopentenones ,Structure-Activity Relationship ,chemistry.chemical_compound ,Oximes ,Drug Discovery ,Enterococcus faecalis ,General Pharmacology, Toxicology and Pharmaceutics ,Pharmacology ,biomass ,Dose-Response Relationship, Drug ,Molecular Structure ,biology ,Chemistry ,Communication ,Organic Chemistry ,Vancomycin Resistance ,biochemical phenomena, metabolism, and nutrition ,sustainability ,biology.organism_classification ,Antimicrobial ,Combinatorial chemistry ,Communications ,Anti-Bacterial Agents ,antimicrobial ,Molecular Medicine ,Bacteria - Abstract
Several naturally occurring cyclopentenones, such as palmenones and nigrosporiones, exhibit antimicrobial activity. Herein we describe the antimicrobial activity of cyclopentenones and derivatives that can be easily accessed from biomass derivatives furfural and 5‐hydroxymethylfurfural. Upon screening a range of functionalized trans‐diamino‐cyclopentenones (DCPs) and δ‐lactone‐fused cyclopentenones (LCPs), an oxime ether derivative of DCP was identified that exhibited remarkable antimicrobial activity against Gram‐positive bacteria, including resistant strains such as methicillin‐resistant S. aureus (MRSA) and vancomycin‐resistant E. faecalis (VRE) strains., Readily sourced! The antimicrobial activity of biomass‐derived cyclopentenones reveals a novel scaffold, exhibiting activities in methicillin‐resistant S. aureus (MRSA) and vancomycin‐resistant E. faecalis (VRE) strains (MIC values of 0.976 and 3.91 μg mL−1, respectively). The straightforward preparation from easily accessible furfurals provides a versatile scaffold that allows further hit‐to‐lead optimization.
- Published
- 2021
30. Assessment of temperature and acid tolerance of Bacillus subtilis isolated from a Brazilian fruit juice-added soy beverage
- Author
-
Renato Ventresqui Oliveira, Lívio da Silva Amaral, Celso Tadeu Barbosa Santos, Aline Dias Paiva, Afonso Pelli, and Cristiane Aparecida Milagres
- Subjects
food.ingredient ,biology ,Chemistry ,Bacillus subtilis ,Cell morphology ,biology.organism_classification ,Spore ,Agar plate ,food ,Agar ,Z-value ,Food science ,D-value ,Incubation - Abstract
Bacillus subtilis is a spore-forming bacterium and an important food contaminant. The aim of this study was to analyze the ability of B. subtilis spores to survive under conditions of low pH and high temperature. The package was purchased at a local supermarket, in Uberaba, Minas Gerais. A sample was collected, diluted and plated on Brain-Heart-Infusion agar (BHI). After incubation, suspected colonies of B. subtilis were transferred to BHI agar. Cell morphology, the presence of spores and Gram stain were examined, and the isolate was identified by 16S rRNA gene sequencing . The microscope evaluation indicated the presence of spores. The thermal tolerance of the spores was evaluated by the addition of 3x109spores/mL in test tubes containing peptone water. Heat treatments were carried out at 80 and 90°C at different incubation times (0, 10, 20, 30, 40, 50 and 60 min). After heating, the tubes were cooled and the number of viable spores was determined in BHI Agar. For the analysis of spore survival, D and Z values were calculated. Tolerance to acid conditions was evaluated using BHI broth with different pH values. After incubation, the bacterial concentration was determined by determining viable cell count on BHI Agar medium. The vegetative cells were transferred to the BHI broth and the pH was adjusted to different values (3, 4 or 5). Sampling were taken 8, 12 and 24 h after incubation. The samples were serially diluted in peptone water and spread in BHI Agar to determine the viable cell count . The 16S rRNA gene sequencing indicated high similarity (99.99%) with B. subtilis. D values were 17.01 min at 80°C and 13.42 min at 90°C. The Z-value was 97.13°C. B. subtilis was not able to grow at pH 3 and pH 4, but its survival was confirmed after the growth of colonies on BHI agar. At pH 5, B. subtilis grew after 24 h and the final pH changed to 7. Our results suggest that the spores of B. subtilis isolated from fruit juice-added soy beverage are tolerant to low pH and high temperature.
- Published
- 2021
31. Recovery of metals from electroactive components of spent Li-ion batteries after leaching with formic acid
- Author
-
Guido Tande Crespo Zeba, Júlio Carlos Afonso, and Jéssica Frontino Paulino
- Subjects
inorganic chemicals ,Chemistry ,Formic acid ,General Chemical Engineering ,Lithium carbonate ,chemistry.chemical_element ,Manganese ,chemistry.chemical_compound ,Nickel ,Leaching (chemistry) ,Lithium ,Formate ,Cobalt ,Nuclear chemistry - Abstract
In this study, the recovery of manganese, nickel, cobalt and lithium of electroactive components from spent lithium-ion batteries is described in detail. Experiments were performed in the presence of formic acid as leachant. Temperature, time, acid concentration and solid/liquid ratio were varied. Manganese, nickel and lithium were leached in high yields (> 99 wt.%) at ~ 80 °C for 3 h using 10 mol L−1 formic acid. This acid played the dual role of leachant and reductant for nickel and manganese. However, cobalt was only half leached under these conditions. The insoluble cobalt was rapidly dissolved after adding H2O2 to the leachant. Leached manganese, cobalt and nickel, in this order, were extracted from the leachates with di-2-ethylhexylphosphoric acid (D2EHPA) (25 °C, A/O = 1 v/v) after adjusting pH of the leachate using lithium carbonate. Stripping was run using 1 mol L−1 H2SO4. Lithium (99.5 wt.%) was recovered as formate, a high-value added byproduct, by careful evaporation of the aqueous final solution, thus reducing generation of final wastes.
- Published
- 2021
32. Green synthesis of carbon nanodots from agro-industrial residues
- Author
-
Ernesto Wrasse, Kelen Menezes Flores Rossi de Aguiar, Felipe Thomaz Aquino, Gisele M. L. Dalmônico, Allan Jr. Gonçalves Afonso, and Matheus Vieira Nascimento
- Subjects
Materials science ,Passivation ,Renewable Energy, Sustainability and the Environment ,Process Chemistry and Technology ,Organic Chemistry ,Energy Engineering and Power Technology ,Infrared spectroscopy ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,Catalysis ,Inorganic Chemistry ,Chemical engineering ,chemistry ,Materials Chemistry ,Ceramics and Composites ,Hydrothermal synthesis ,Solubility ,0210 nano-technology ,Luminescence ,Carbon - Abstract
Fluorescent nanostructures based on carbon, or carbon dots, are attracting much attention and interest because of their diverse properties which can be applied in several fields of knowledge, such as optics, biomedicine, environmental research, among others. Such properties are in part, derived from its intrinsic luminescence from tunable functional groups. In this work, we produced carbon nanodots (CND) using agro-industrial residues, such as Lolium perenne and malt bagasse. The methods used were conventional hydrothermal syntheses and microwave-assisted hydrothermal synthesis. To the best of our knowledge, this is the first time that carbon dots synthesized from this ryegrass type are reported. The synthesis methods were one step (no catalyst, base, or acid were added for passivation), and the functional groups responsible for the luminescence and high solubility in water were identified by infrared spectroscopy, being mainly C=O, C–OH, C–N, and N–H. According to our theoretical studies, the C=O group introduced a new energy level for electronic transitions that can affect the emission properties. Fluorescence images of osteoblasts using CNDs were acquired and their chelating property towards Pb2+ and Cr6+ detection was tested.
- Published
- 2021
33. Remoção de Carbendazim em águas de abastecimento por clarificação acoplada à adsorção em escala de bancada
- Author
-
Paulo Bernardo Neves e Castro, Robson José de Cássia Franco Afonso, Sergio Francisco de Aquino, and Andressa Rezende Pereira
- Subjects
Chemistry ,0208 environmental biotechnology ,Environmental engineering ,carvão ativado em pó ,02 engineering and technology ,General Medicine ,010501 environmental sciences ,TA170-171 ,01 natural sciences ,Environmental technology. Sanitary engineering ,020801 environmental engineering ,Environmental sciences ,remoção de agrotóxico ,GE1-350 ,tratamento de água ,TD1-1066 ,0105 earth and related environmental sciences - Abstract
O objetivo deste artigo é avaliar a remoção do fungicida Carbendazim da água durante a clarificação acoplada ou não à adsorção em carvão ativado em pó (CAP) em escala de bancada. Para a clarificação, utilizaram-se os coagulantes sulfato de alumínio, o cloreto de polialumínio e o cloreto férrico em dose e pH otimizados previamente para remoção de sólidos em suspensão de águas de baixa (20 NTU) ou alta (200 NTU) turbidez. A adsorção com CAP (2,5; 5 e 10 mg L-1) foi testada adicionando-o com o coagulante ou após a clarificação. A etapa de clarificação resultou em remoções variadas do agrotóxico, sendo o cloreto férrico mais eficiente para águas de alta turbidez (67%) e o cloreto de polialumínio para água de baixa turbidez (86%). A adição de CAP com o coagulante resultou em uma melhoria na eficiência de remoção apenas na dose mais elevada do adsorvente, chegando a 87% de eficiência para a dose de 10 mg L-1 de CAP em águas de baixa turbidez. Palavras-chave: Tratamento de água. Remoção de agrotóxico. Carvão ativado em pó.
- Published
- 2021
34. Lisboaeflavanonol A: A new flavonoid glycoside obtained from Amazonian Eugenia lisboae
- Author
-
Felipe M. A. da Silva, Francinete Ramos Campos, Estevan Bruginski, Andrezza S. Ramos, Rita de Cássia Saraiva Nunomura, Kidney O.G. Neves, Afonso D. L. de Souza, and Marcos B. Machado
- Subjects
chemistry.chemical_classification ,biology ,010405 organic chemistry ,Stereochemistry ,Flavonoid ,Myrtaceae ,Ethyl acetate ,Glycoside ,Plant Science ,biology.organism_classification ,01 natural sciences ,Biochemistry ,High-performance liquid chromatography ,0104 chemical sciences ,Matrix (chemical analysis) ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,chemistry ,Triterpene ,Agronomy and Crop Science ,Chemical composition ,Biotechnology - Abstract
Eugenia lisboae M.A.D. Souza (Myrtaceae) is a species found in the Amazon biome, recently described and has not yet been studied regarding its chemical properties. This study aims to identify the main chemical constituents of crude ethyl acetate and ethanolic extracts from E. lisboae leaves. These crude extracts were fractionated using chromatographic methods (LC and HPLC). The identified compounds are a triterpene (1), three organic acids (2 - 4), and two flavonoids (5 and 6). These structures were determined by analyzing the spectroscopic (NMR and MS) data. Compound 6 was named lisboaeflavanonol A {(−)-2R,3R-dihydrokampferol 3-O-β- d -xylopyranosyl-(1”'→2”)-α- l -rhamnopyranoside}, undescribed in the literature. These were the first compounds described in this matrix, and the chemical composition is in line with chemistry of the Eugenia genus. In addition, preliminary molecular docking analysis indicated lisboaeflavanonol A as a potential inhibitor of 3-chymotrypsin-like cysteine protease (3CLpro) and RNA-dependent RNA polymerase (RdRp), which are important SARS-CoV-2 non-structural proteins (NSPs).
- Published
- 2021
35. Chemotherapy de-escalation using an 18F-FDG-PET-based pathological response-adapted strategy in patients with HER2-positive early breast cancer (PHERGain): a multicentre, randomised, open-label, non-comparative, phase 2 trial
- Author
-
Javier Cortes, Manuel Ruiz Borrego, Khaldoun Kerrou, Cinta Albacar, Miguel Sampayo-Cordero, Begoña Bermejo, Nuria Ribelles, Peter Schmid, Andrea Malfettone, Lourdes Calvo, Geraldine Gebhart, Trial Investigators, Marco Colleoni, Florence Dalenc, Noemia Afonso, Agostina Stradella, Serena Di Cosimo, Aleix Prat, Noelia Martínez, Frederik Marmé, Santiago Escrivá-de-Romaní, Antonio Llombart-Cussac, and Jose Perez-Garcia
- Subjects
medicine.medical_specialty ,Intention-to-treat analysis ,business.industry ,medicine.disease ,Loading dose ,Carboplatin ,law.invention ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Breast cancer ,Oncology ,Docetaxel ,Randomized controlled trial ,chemistry ,Trastuzumab ,law ,030220 oncology & carcinogenesis ,Internal medicine ,medicine ,030212 general & internal medicine ,Pertuzumab ,business ,medicine.drug - Abstract
Summary Background Several de-escalation approaches are under investigation in patients with HER2-positive, early-stage breast cancer. We assessed early metabolic responses to neoadjuvant trastuzumab and pertuzumab using 18F-fluorodeoxyglucose (18F-FDG)-PET (18F-FDG-PET) and the possibility of chemotherapy de-escalation using a pathological response-adapted strategy. Methods We did a multicentre, randomised, open-label, non-comparative, phase 2 trial in 45 hospitals in Spain, France, Belgium, Germany, the UK, Italy, and Portugal. Eligible participants were women aged 18 years or older with centrally confirmed, HER2-positive, stage I–IIIA, invasive, operable breast cancer (≥1·5 cm tumour size) with at least one breast lesion evaluable by 18F-FDG-PET, an Eastern Cooperative Oncology Group performance status of 0 or 1, and a baseline left ventricular ejection fraction of at least 55%. We randomly assigned participants (1:4), via an interactive response system using central block randomisation with block sizes of five, stratified by hormone receptor status, to either docetaxel (75 mg/m2 intravenous), carboplatin (area under the concentration–time curve 6 mg/mL per min intravenous), trastuzumab (subcutaneous 600 mg fixed dose), and pertuzumab (intravenous 840 mg loading dose, 420 mg maintenance doses; group A); or trastuzumab and pertuzumab (group B). Hormone receptor-positive patients allocated to group B were additionally given letrozole if postmenopausal (2·5 mg/day orally) or tamoxifen if premenopausal (20 mg/day orally). Centrally reviewed 18F-FDG-PET scans were done before randomisation and after two treatment cycles. Patients assigned to group A completed six cycles of treatment (every 3 weeks) regardless of 18F-FDG-PET results. All patients assigned to group B initially received two cycles of trastuzumab and pertuzumab. 18F-FDG-PET responders in group B continued this treatment for six further cycles; 18F-FDG-PET non-responders in this group were switched to six cycles of docetaxel, carboplatin, trastuzumab, and pertuzumab. Surgery was done 2–6 weeks after the last dose of study treatment. Adjuvant treatment was selected according to the neoadjuvant treatment administered, pathological response, hormone receptor status, and clinical stage at diagnosis. The coprimary endpoints were the proportion of 18F-FDG-PET responders in group B with a pathological complete response in the breast and axilla (ypT0/is ypN0) as determined by a local pathologist after surgery after eight cycles of treatment, and 3-year invasive disease-free survival of patients in group B, both assessed by intention to treat. The definitive assessment of pathological complete response was done at this primary analysis; follow-up to assess invasive disease-free survival is continuing, hence these data are not included in this Article. Safety was assessed in all participants who received at least one dose of study drug. Health-related quality-of-life was assessed with EORTC QLQ-C30 and QLQ-BR23 questionnaires at baseline, after two cycles of treatment, and before surgery. This trial is registered with EudraCT (2016-002676-27) and ClinicalTrials.gov ( NCT03161353 ), and is ongoing. Findings Between June 26, 2017, and April 24, 2019, we randomly assigned 71 patients to group A and 285 to group B. Median follow-up was 5·7 months (IQR 5·3–6·0). 227 (80%) of 285 patients in group B were 18F-FDG-PET responders, of whom 86 (37·9%, 95% CI 31·6–44·5; p Interpretation 18F-FDG-PET identified patients with HER2-positive, early-stage breast cancer who were likely to benefit from chemotherapy-free dual HER2 blockade with trastuzumab and pertuzumab, and a reduced impact on global health status. Depending on the forthcoming results for the 3-year invasive disease-free survival endpoint, this strategy might be a valid approach to select patients not requiring chemotherapy. Funding F Hoffmann-La Roche.
- Published
- 2021
36. Geochemical characterization and the assessment of trace element retention in sediments of the Reconquista River, Argentina
- Author
-
Roberto A. Scasso, Cecilia Gisela Cantera, Ana Elisabeth Tufo, and María dos Santos Afonso
- Subjects
chemistry.chemical_classification ,geography ,Environmental Engineering ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Chemical oxygen demand ,Trace element ,chemistry.chemical_element ,General Medicine ,010501 environmental sciences ,01 natural sciences ,Sulfur ,chemistry ,Geochemistry and Petrology ,Environmental chemistry ,Tributary ,Environmental Chemistry ,Environmental science ,Substrate (aquarium) ,Organic matter ,Water quality ,Enrichment factor ,0105 earth and related environmental sciences ,General Environmental Science ,Water Science and Technology - Abstract
The mineralogical and geochemical characterization of sediments of the Reconquista River allows analyzing the geochemical partition of trace elements in one of the most polluted water courses of Argentina. The low dissolved oxygen and high ammonia contents, together with the high chemical oxygen demand, attest to the poor water quality. Ammonia, Cd and Cu content in surficial water exceeds the maximum guidelines for freshwater in Argentina. The recent sediments of the uppermost bed are enriched in organic matter (OM), sulfur, Zn, Cu and Pb. The enrichment factor is moderate, and the geoaccumulation index (Igeo) for Cu and Pb indicates uncontaminated to moderately contaminated sediments. The positive and significant correlation between As, Cr, Pb and Zn with the iron content suggests that their retention is controlled by the amount of iron oxy (hydr)oxides in the sediments, probably combined with the silt + clay abundance. In comparison with its tributary, the Las Catonas Stream, the Reconquista River, has less OM and trace elements in the sediments and more dissolved trace elements in the interstitial water. We interpret that OM is the main sorbent of the trace element. In the absence of OM, the iron oxy (hydr)oxides and the silt + clay fraction are a less efficient substitute. Consequently, the interstitial waters of the Reconquista River are enriched in these elements. Therefore, minor changes in the environmental conditions may generate significant release of hazardous trace elements from the sediments to the interstitial water and, in turn, to the surficial water of the river. As most of the big cities and the agricultural activities of Argentina are developed on the loessic substrate, the understanding of its interaction with polluted waters is crucial.
- Published
- 2021
37. The Effect of Solution Heat Treatment Time on the Phase Formation and Selected Mechanical Properties of Ti-25Ta-xZr Alloys for Application as Biomaterials
- Author
-
Carlos Roberto Grandini, Fernanda de Freitas Quadros, Conrado Ramos Moreira Afonso, Pedro Akira Bazaglia Kuroda, Universidade Estadual Paulista (Unesp), Tribocorrosion and Nanomedicine, and Universidade Federal de São Carlos (UFSCar)
- Subjects
Materials science ,Alloy ,chemistry.chemical_element ,02 engineering and technology ,mechanical properties ,engineering.material ,01 natural sciences ,Indentation hardness ,law.invention ,Optical microscope ,law ,Phase (matter) ,0103 physical sciences ,General Materials Science ,Composite material ,Elastic modulus ,010302 applied physics ,Zirconium ,Precipitation (chemistry) ,metallic biomaterial ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Microstructure ,solution heat treatment ,chemistry ,Mechanics of Materials ,engineering ,0210 nano-technology ,Ti alloys - Abstract
Made available in DSpace on 2021-06-25T11:16:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 This study analyzed the influence of solution heat treatment on the structure, microstructure, hardness, and elastic modulus of a ternary alloys Ti-25Ta-xZr system, where the zirconium content was varied to 0, 10, 20, 30, and 40 wt%. The solution heat treatments (SHT) performed in this paper were conducted at 1273 K during 0, 3, and 6 h. Structural and microstructural analyses were performed using x-ray diffraction, optical microscopy, and scanning, and transmission electron microscopy. An analysis of the alloys’ selected mechanical properties was carried out using microhardness and dynamic elastic modulus measurements. The results showed that zirconium helped stabilize the β phase since by adding zirconium to the alloy, the tantalum volumetric fraction increased. SHT with longer duration induced precipitation of the β phase in the Ti-25Ta-Zr alloy system. With higher zirconium concentrations, Ti-25Ta-xZr alloys showed better mechanical compatibility with human bone with a low elastic modulus but higher hardness values, making the mechanical conformation of the alloy more difficult. The Ti-25Ta-30Zr alloy had high hardness and elastic modulus after being subjected to solution for 3 and 6 h, indicating ω phase precipitation, and Ti-25Ta-40Zr alloy showed the lowest value of elastic modulus of 57 GPa with good prospects for applications as a metallic biomaterial. Laboratório de Anelasticidade e Biomateriais UNESP – Univ. Estadual Paulista IBTN/BR –Brazilian Branch Institute of Biomaterials Tribocorrosion and Nanomedicine Materials Engineering Department (DEMa) Universidade Federal de São Carlos (UFSCar) Laboratório de Anelasticidade e Biomateriais UNESP – Univ. Estadual Paulista
- Published
- 2021
38. One‐Pot Synthesis of Xanthone by Carbonylative Suzuki Coupling Reaction
- Author
-
Ana Maia, Carlos M. G. Azevedo, Carlos A. M. Afonso, Daniela R. P. Loureiro, Trond Ulven, Salette Reis, Maria Rangel, José X. Soares, Steffen V F Hansen, Madalena Pinto, and André M. N. Silva
- Subjects
design of experiments ,chemistry.chemical_compound ,chemistry ,Suzuki reaction ,xanthone ,Xanthone ,One-pot synthesis ,synthetic methods ,carbonylation ,General Chemistry ,optimization ,Carbonylation ,Combinatorial chemistry - Abstract
Xanthone derivatives have a dibenzo-y-pyrone scaffold which has gained great interest in Medicinal Chemistry due to their diverse biological activities. Usually, its synthesis requires multi-step synthetic routes using harsh conditions and high catalyst loadings. In this communication, we report for the first time a one-pot synthesis of the xanthone scaffold based on a carbonylative Suzuki coupling. Iodophenol and (2-methoxyphenyl)boronic acid were coupled under carbon monoxide, generated from a carbon monoxide surrogate. An experimental data-based model was built to guide the reaction optimization. The optimized conditions were 1 mol% of a pincer complex as palladium catalyst, 5 equivalents of K2CO3 as base, and DMF:water (7 : 3) as solvent. The robustness of the synthetic method, namely in terms of the reactants scope, was also evaluated. This approach provided the xanthone scaffold in high yields and provided a deep insight into the carbonylative Suzuki couplings.
- Published
- 2021
39. Safety and In Situ Antierosive Effect of CaneCPI-5 on Dental Enamel
- Author
-
C. C. Gironda, Marília Afonso Rabelo Buzalaf, A. C. Santiago, Beatriz Martines de Souza, Thamyris de Souza Carvalho, Vinícius Taioqui Pelá, Rodrigo Cardoso de Oliveira, Samanta Mascarenhas Moraes, Flávio Henrique-Silva, Cintia Kazuko Tokuhara, Natara Dias Gomes da Silva, João Guilherme Quintal Lunardelli, and Ana Carolina Magalhães
- Subjects
Toothbrushing ,Abrasion (dental) ,Saliva ,H&E stain ,Dentistry ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,medicine ,Animals ,Humans ,Tooth Erosion ,Dental Enamel ,General Dentistry ,Cross-Over Studies ,Enamel paint ,Eosin ,business.industry ,030206 dentistry ,medicine.disease ,Cystatins ,Staining ,Tooth Abrasion ,chemistry ,Tooth wear ,030220 oncology & carcinogenesis ,visual_art ,visual_art.visual_art_medium ,Cattle ,ESMALTE DENTÁRIO ,Tooth Wear ,Citric acid ,business - Abstract
The sugarcane cystatin (CaneCPI-5) was recently cloned and showed strong binding force to dental enamel and protection against initial erosion. However, evaluations on its safety and efficacy in a situation closer to the clinical condition are necessary. In the present study we analyzed 1) the cytotoxicity of CaneCPI-5 on human gingival fibroblasts (HGFs); 2) the ability of CaneCPI-5 to reduce enamel erosion and erosion+abrasion in situ. In part 1, HGFs were treated with CaneCPI-5 (0.025, 0.05, 0.1, 0.5 or 1.0 mg/mL) or no treatment (control). The cytotoxicity was assessed after 60 s and 24 h by mitochondrial activity (MTT), confocal microscopy, and hematoxylin/eosin staining. In part 2, 15 volunteers participated in a double-blind crossover protocol consisting of 3 phases, according to the following treatments: 1) 0.1 mg/mL CaneCPI-5; 2) SnCl2/NaF/AmF (Elmex; positive control); 3) water (negative control). The volunteers wore an appliance containing 4 bovine enamel specimens for 5 d. Each day, the specimens were individually treated with 50 µL of the tested solutions per 60 s and then subjected to erosive challenges (0.1% citric acid, pH 2.5, for 90 s, 4 times per day). After the first and last erosive challenge each day, 2 samples were abraded (toothbrushing, 15 s). Enamel wear was measured by contact profilometry. One or two-way analysis of variance (ANOVA)/Tukey’s or Sidak’s tests ( P < 0.05) were applied. Regardless of the concentration and the experimental time, CaneCPI-5 did not decrease the cell viability compared to the negative control ( P < 0.05). Erosion+abrasion led to significantly greater wear compared to erosion only. For both conditions, the lowest wear was found for SnCl2 and CaneCPI-5, which did not differ significantly from each other, but showed significant protection when compared to the negative control. In conclusion, CaneCPI-5 is safe on HGFs and reduces enamel erosive wear to the same extent as a commercial solution used to control erosive tooth wear (ETW).
- Published
- 2021
40. Are carbon dots effective for ion sensing and antiviral applications? A state-of-the-art description from synthesis methods to cost evaluation
- Author
-
Natan Padoin, Domingos Lusitâneo Pier Macuvele, Humberto Gracher Riella, Cíntia Soares, and Afonso Henrique da Silva Júnior
- Subjects
Virucidal effect ,Materials science ,Functionalized nanoparticles ,Synthesis methods ,Ion sensing ,Nanoparticle ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,01 natural sciences ,Biomaterials ,Nanosensor ,0103 physical sciences ,Cost evaluation ,Carbon dots ,010302 applied physics ,Mining engineering. Metallurgy ,Metals and Alloys ,TN1-997 ,021001 nanoscience & nanotechnology ,Activity-based costing method ,Surfaces, Coatings and Films ,Characterization (materials science) ,chemistry ,Ceramics and Composites ,Surface modification ,0210 nano-technology ,Carbon - Abstract
Carbon dots (CDs) are versatile nanoparticles with great potential for biological and environmental applications. CDs have unique characteristics such as high photostability, low cytotoxicity, size below 10 nm, rapid synthesis, and easy functionalization. These nanoparticles are promising for the development of fluorescent probes and the inactivation of microorganisms, especially viruses. This review covers several topics involving CDs, including synthesis methods, precursors, characterization techniques, sensitivity mechanisms, fluorescence origin, functionalization, and an overview of applications as nanosensors and virucidal agents. In addition, for the first time an economic analysis of the production of CDs from biomass using the Activity-Based Costing method was suggested. Finally, the main advances, gaps and future directions regarding the CDs were carefully analyzed.
- Published
- 2021
41. Cemental composites with polyurethane and recycled polyvinyl chloride: The influence of industrial waste addition on flammability
- Author
-
Florentino Soriano Corral, Américo Cruz Júnior, Ana Carolina de Aguiar, Bruno Afonso Büchele Mendonça, Luciano da Silva, Saul Sanchez, Ricardo Luis Barcelos, Rachel Faverzani Magnago, Gabriel Oscar Cremona Parma, Igor Fagundes Valezan, and Diego Valdevino Marques
- Subjects
Materials science ,Polymers and Plastics ,business.industry ,General Chemistry ,Industrial waste ,Polyvinyl chloride ,chemistry.chemical_compound ,chemistry ,Thermal insulation ,Materials Chemistry ,Ceramics and Composites ,Composite material ,business ,Flammability ,Polyurethane - Published
- 2021
42. Effect of applying a calcined kaolin-based particle film on the photosynthetic capacity and growth of young eucalyptus plants
- Author
-
Diego Pereira Santos, Heder Braum, Fabrício de Oliveira Reis, Fábio Afonso Mazzei Moura de Assis Figueiredo, Niedja Bezerra Costa, Eliemar Campostrini, Mauriana da Rocha Sobrinho, Tiago Massi Ferraz, and Maria de Fátima de Castro Oliveira
- Subjects
0106 biological sciences ,Stomatal conductance ,Chemistry ,Randomized block design ,Forestry ,04 agricultural and veterinary sciences ,Photosynthesis ,01 natural sciences ,Photosynthetic capacity ,Horticulture ,Shoot ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Water-use efficiency ,Chlorophyll fluorescence ,010606 plant biology & botany ,Transpiration - Abstract
In scenarios of climatic change when increased global temperatures can be expected, it is essential to search for technologies that favor sapling survival and growth after planting and increase yield in the field. Kaolin-based particle films (KBPF) have been applied as barriers against the deleterious effects of high levels of solar radiation. The objective of the present study was to assess the effects of applying purified calcined kaolin-based particle film to young eucalyptus plants. Five treatments were carried out: 0% (just water), 3%, 5%, 7%, and 10% calcined kaolin applied to the adaxial part of the leaves. A complete randomized block design was used with five treatments and ten replicates. The plants were assessed for height, diameter at ground level, gas exchanges (net photosynthetic CO2 assimilation, stomatal conductance and transpiration), instantaneous (WUE) and intrinsic water use efficiency (IWUE), chlorophyll a fluorescence (maximum quantum yield of photosystem II (PSII) (Fv/Fm), concentration of active reaction centers in relation to the quantity of photons absorbed (RC/ABS) and the maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PSII (Fv/F0), SPAD reading and leaf ontogeny. The 3% KBPF concentration showed the best responses in biometric assessments 80 days after planting (DAP) and were corroborated by the responses of the leaf, stem and shoot dry matter production as a whole. The leaf ontogeny assessments showed positive responses following KBPF application when considering leaf development, with 7% KBPF concentration resulting in the highest mean values. The mean specific leaf mass had negative response to high KBPF concentrations. At 60 DAP, the gas exchange variables during both assessment periods declined with an increase in KBPF concentration. Significant differences as a result of KBPF applications were found only at the start of the assessments (34 DAP) for both WUE and for IWUE. Leaf ‘greenness’ (SPAD reading) at 47 days showed a quadratic relationship in both periods. The variables of chlorophyll fluorescence showed a linear response at 34 DAP and a quadratic response 60 DAP. KBPF application increased height and diameter growth in plants treated with 3% KBPF but this response was not associated with photochemical efficiency and photosynthetic carbon assimilation values on a single-leaf basis. The best performance among the variables was provided by 3% KBPF application.
- Published
- 2021
43. Better light spectral quality and thermal amplitude inside the greenhouse stimulate growth and improve acclimatization of in vitro–grown Cattleya warneri T. Moore
- Author
-
Andressa Leal Generoso, Eliemar Campostrini, Rafael Walter, Virginia Silva Carvalho, Jefferson Rangel da Silva, Fábio Afonso Mazzei Moura de Assis Figueiredo, Geraldo de Amaral Gravina, Luciene Souza Ferreira, Tiago Massi Ferraz, Weverton Pereira Rodrigues, and Wagner A. Vendrame
- Subjects
0106 biological sciences ,0301 basic medicine ,Sucrose ,Biomass ,Plant Science ,Biology ,biology.organism_classification ,Photosynthesis ,01 natural sciences ,Acclimatization ,Photosynthetic capacity ,03 medical and health sciences ,chemistry.chemical_compound ,Light intensity ,Tissue culture ,Horticulture ,030104 developmental biology ,chemistry ,Cattleya warneri ,010606 plant biology & botany ,Biotechnology - Abstract
Growth and photosynthetic capacity of Cattleya warneri T. Moore seedlings cultivated in vitro were evaluated in two environments: (1) growth room (GR) with constant light, humidity, and temperature; and (2) greenhouse (GH) with variable humidity, temperature, and light intensity and quality. In both environments, two different tissue culture vessel lids were used: transparent plastic lids (TCVplastic) and non-transparent metal lids (TCVmetal). After 11 months of in vitro cultivation, five seedlings from each tissue culture vessel were evaluated for growth and photosynthetic capacity, while the other five seedlings of each tissue culture vessel were transferred to a greenhouse for acclimatization. Increased biomass production in vitro was observed in GH and GR (GH>GR). However, the photosynthetic capacity was not altered by the GH environment, since the net photosynthetic rate at 300 μmol m−2 s−1 (NPR300) was low in the final of period in all treatments. Therefore, the increase in biomass production in C. warneri was mostly dependent on the exogenous carbon source through the addition of sucrose to the culture medium. The use of TCVplastic in vitro improved seedlings’ growth in both GR and GH, showing an advantage in relation to TCVmetal. GH environment with quality light spectrum and thermal amplitude, and use of TCVplastic, increased biomass production in vitro and improved the acclimatization process of C. warneri seedlings, which also reduced electricity costs since the use of artificial light and air conditioning is not required.
- Published
- 2021
44. Prevention of non-cavitated lesions with fluoride and xylitol varnishes during orthodontic treatment: a randomized clinical trial
- Author
-
Camila Massaro, Vinicius Merino Silva, Guilherme Janson, Marília Afonso Rabelo Buzalaf, and Daniela Gamba Garib
- Subjects
Varnish ,Dentistry ,Dental Caries ,Placebo ,Xylitol ,Oral hygiene ,law.invention ,Fluorides ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Randomized controlled trial ,law ,Humans ,Medicine ,Fluorides, Topical ,Dental Enamel ,General Dentistry ,Enamel paint ,business.industry ,Fluoride varnish ,030206 dentistry ,Cariostatic Agents ,stomatognathic diseases ,chemistry ,030220 oncology & carcinogenesis ,visual_art ,visual_art.visual_art_medium ,Sodium Fluoride ,PATOLOGIA BUCAL ,business ,Fluoride - Abstract
Fixed orthodontic appliances impair oral hygiene increasing the risk of non-cavitated lesions (NCLs) and tooth decay. The aim of this study was to compare the outcomes of fluoride and xylitol varnishes in preventing NCLs during comprehensive orthodontic treatment. The sample comprised 55 volunteers from 15 to 20 years of age under orthodontic treatment that were randomly divided into three groups: Fluoride Group (FG; n=17), Xylitol Group (XG; n=19), and Placebo Group (PG; n=19). The patients in each group received two applications of the following varnishes: DuraphatTM (5% NaF), 20% xylitol, and placebo (no F/Xylitol) in the three groups, respectively. The varnishes were applied in the first appointment (T0) and 3 months later (T1). Clinical examinations were carried out at T0 and 6 months after (T2) using the ICDAS index and the QLF system (fluorescence difference). The intergroup comparisons were performed by ANOVA/Tukey’s or Kruskal-Wallis/Dunn’s tests (P
- Published
- 2021
45. Muscle metabolic remodelling patterns in Duchenne muscular dystrophy revealed by ultra-high-resolution mass spectrometry imaging
- Author
-
Ivana Dabaj, Justine Ferey, Florent Marguet, Vianney Gilard, Carole Basset, Youssef Bahri, Anne-Claire Brehin, Catherine Vanhulle, France Leturcq, Stéphane Marret, Annie Laquerrière, Isabelle Schmitz-Afonso, Carlos Afonso, Soumeya Bekri, Abdellah Tebani, Department of neonatal pediatrics, Intensive Care and Neuropediatrics, Rouen University Hospital, Rouen University Hospital, Rouen University, Team 4 'NeoVasc' - INSERM U1245, Génomique et Médecine Personnalisée du Cancer et des Maladies Neuropsychiatriques (GPMCND), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Département de biochime métabolique [CHU Rouen], CHU Rouen, Normandie Université (NU)-Normandie Université (NU), Department of Pathology, Rouen University Hospital, Department of neurosurgery, Rouen University Hospital, Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of genetics and reference center for developmental disorders, Laboratoire de Génétique et biologie moléculaire, HUPC Cochin, Hôpital Cochin [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Schmitz, Isabelle, Team 4 NeoVasc - Region Team ERI 28 INSERM (Neovasc), Département de Pathologie [CHU Rouen], Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Male ,Pathology ,Biopsy ,Duchenne muscular dystrophy ,chemistry.chemical_compound ,Adenosine Triphosphate ,0302 clinical medicine ,Child ,0303 health sciences ,[SDV.MHEP] Life Sciences [q-bio]/Human health and pathology ,Multidisciplinary ,biology ,Phosphatidic acid ,Middle Aged ,Neuromuscular disease ,Sphingomyelins ,Child, Preschool ,Phosphatidylcholines ,Medicine ,medicine.symptom ,Dystrophin ,Sphingomyelin ,Adult ,musculoskeletal diseases ,medicine.medical_specialty ,[CHIM.ANAL] Chemical Sciences/Analytical chemistry ,Adolescent ,Science ,Phosphatidic Acids ,Phosphatidylserines ,Article ,Mass spectrometry imaging ,03 medical and health sciences ,[CHIM.ANAL]Chemical Sciences/Analytical chemistry ,medicine ,Animals ,Humans ,Metabolomics ,Muscle, Skeletal ,Myopathy ,030304 developmental biology ,Mass spectrometry ,Metabolism ,medicine.disease ,Muscular Dystrophy, Duchenne ,chemistry ,biology.protein ,Adenosine triphosphate ,030217 neurology & neurosurgery ,[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology - Abstract
Duchenne muscular dystrophy (DMD) is a common and severe X-linked myopathy, characterized by muscle degeneration due to altered or absent dystrophin. DMD has no effective cure, and the underlying molecular mechanisms remain incompletely understood. The aim of this study is to investigate the metabolic changes in DMD using mass spectrometry-based imaging. Nine human muscle biopsies from DMD patients and nine muscle biopsies from control individuals were subjected to untargeted MSI using matrix-assisted laser desorption/ionization Fourier-transform ion cyclotron resonance mass spectrometry. Both univariate and pattern recognition techniques have been used for data analysis. This study revealed significant changes in 34 keys metabolites. Seven metabolites were decreased in the Duchenne biopsies compared to control biopsies including adenosine triphosphate, and glycerophosphocholine. The other 27 metabolites were increased in the Duchenne biopsies, including sphingomyelin, phosphatidylcholines, phosphatidic acids and phosphatidylserines. Most of these dysregulated metabolites are tightly related to energy and phospholipid metabolism. This study revealed a deep metabolic remodelling in phospholipids and energy metabolism in DMD. This systems-based approach enabled exploring the metabolism in DMD in an unprecedented holistic and unbiased manner with hypothesis-free strategies.
- Published
- 2021
46. Development of novel geopolymeric foam composites coated with polylactic acid to remove heavy metals from contaminated water
- Author
-
Vinícius de Oliveira Aguiar, Sergio Neves Monteiro, João Gabriel Passos Rodrigues, Afonso Rangel Garcez de Azevedo, Fernanda Santos da Luz, Maria de Fátima Vieira Marques, and Flávio James Humberto Tommasini Vieira Ramos
- Subjects
Thermogravimetric analysis ,Aqueous solution ,Materials science ,Materials Science (miscellaneous) ,Geopolymer ,Sustainable ,Foam ,law.invention ,Portland cement ,chemistry.chemical_compound ,Adsorption ,Heavy metal ,Polylactic acid ,chemistry ,law ,Ground granulated blast-furnace slag ,Poly(lactic acid) ,TA401-492 ,Composite material ,Porosity ,Materials of engineering and construction. Mechanics of materials ,Composites - Abstract
As an alternative for ordinary Portland cement, geopolymers are cost effective materials that can be prepared with relatively low energy consumption and substantial reduction of CO2 emissions. In the present study the characteristics of novel hybrid composite of geopolymer foam (GPF)/polylactic acid (PLA) and their efficiency in removing copper(II) and zinc(II) to treat high volumes of polluted water are investigated. Contrary to the conventional methods for removing heavy metals, the newly developed composites are ecological, low-cost, easily available, and economically viable alternatives providing good physical-chemical stability, ion-exchange properties, and a porous structure. Based on the sustainable advantage to produce geopolymers from recycled materials, GPFs were obtained from blast furnace slag (BFS) by reacting 20 mL of an 8 M alkaline solution of sodium metasilicate (Na2SiO3) with BFS particles and later addition of hydrogen peroxide. GPFs were produced with a stoichiometry of 1.4 and 1.6 g/L between BFS/alkali solution with a 1.6 ml solution of hydrogen peroxide 50% to develop porosity into the materials. Finally, the GPFs were coated with PLA. Specimens of GPF/PLA composites were characterized by X-ray fluorescence spectroscopy, Fourier transformed infrared spectroscopy, thermogravimetric analysis, dynamic mechanical analysis, and field emission gun scanning electron microscopy. Adsorption analysis of Cu(II) and Zn(II), as well as ion-exchanges from aqueous solution through the composite with 1.4 and 1.6 stoichiometry, were performed using deionized water containing 0.80% Cu(II) or Zn(II). The test resulted in high performance for retaining Cu(II) and Zn(II). Under CO2 pressure at 50 bar, the gas permeation tests confirmed porous formations into the geopolymer foams coated with molten PLA.
- Published
- 2022
47. RECOVERY OF METALS FROM ELECTROACTIVE COMPONENTS OF SPENT Ni-MH BATTERIES AFTER LEACHING WITH FORMIC ACID
- Author
-
Pedro Rosário Gismonti, Júlio Carlos Afonso, and Jéssica Frontino Paulino
- Subjects
Environmental Engineering ,Aqueous solution ,Formic acid ,Sodium formate ,0211 other engineering and technologies ,chemistry.chemical_element ,02 engineering and technology ,Raffinate ,Zinc ,010501 environmental sciences ,Sodium oxalate ,01 natural sciences ,chemistry.chemical_compound ,chemistry ,Environmental Chemistry ,Formate ,Leaching (metallurgy) ,Waste Management and Disposal ,021102 mining & metallurgy ,0105 earth and related environmental sciences ,Nuclear chemistry - Abstract
this work describes a route for recovering nickel, cobalt, iron, zinc and lanthanides from spent nickel-metal hydride batteries. Formic acid was used as leachant. Experiments were run at 25-50°C for 1-4 h. Under the best conditions leaching yields surpassed 99 wt.%, except for iron. The insoluble matter contains almost solely iron as iron(III) basic formate. The leachate went through six separation procedures, combining solvent extraction with D2EHPA as extractant, and precipitation reactions. Fe2+ and Zn2+ were extracted together (> 99 wt.%) from the original leachate (pH ~1.5). Yttrium and lanthanides were precipitated as oxalates directly from the raffinate (> 99.9 wt.%) upon addition of sodium oxalate. In the next steps, Mn2+ and Co2+ were extracted with D2EHPA at buffered pH (3 and ~4.8, respectively), after adding NaOHaq. About 10 wt.% of leached Ni2+ was coextracted with Co2+. The remaining Ni2+ was precipitated from the raffinate after addition of aqueous sodium oxalate at pH 6. After precipitation of Al3+ upon addition of NaOHaq. until pH ~8, sodium formate was recovered after slow evaporation of the final aqueous solution at 60oC. It contains ~90 wt.% of the formate present in the leachant.
- Published
- 2021
48. Exploring Complex Mixtures by Cyclic Ion Mobility High-Resolution Mass Spectrometry: Application Toward Petroleum
- Author
-
Eleanor Riches, Carlos Afonso, Pierre Giusti, Johann Le Maître, Christopher P. Rüger, Martin Palmer, and Julien Maillard
- Subjects
Ion-mobility spectrometry ,Chemistry ,010401 analytical chemistry ,Structural dimension ,010402 general chemistry ,Mass spectrometry ,01 natural sciences ,Mass spectrometric ,Dissociation (chemistry) ,0104 chemical sciences ,Analytical Chemistry ,Ion ,Petrochemical ,Chemical physics ,Isobaric process - Abstract
The in-depth isomeric and isobaric description of ultra-complex organic mixtures remains one of the most challenging analytical tasks. In the last two decades, ion mobility coupled to high-performance mass spectrometry added an additional structural dimension. Despite tremendous instrumental improvements, commercial devices are still limited in ion mobility and mass spectrometric resolving power and struggle to resolve isobaric species and complex isomeric patterns. To overcome these limitations, we explored the capabilities of cyclic ion mobility high-resolution mass spectrometry with special emphasis on petrochemical applications. We could show that quadrupole-selected ion mobility mass spectrometry gives closer insights into the isomeric distribution. In combination with slicing the specific parts of the ion mobility dimension, isobaric interferences could be drastically removed. Collision-induced dissociation (CID) allowed separating structural groups of polycyclic aromatic hydrocarbons and heterocycles (PAH/PASH), deploying up to 10 passes in the cyclic ion mobility device. Finally, we introduce a data processing workflow to resolve the 3.4 mDa SH4/C3 mass split by combining ion mobility and mass spectrometric resolving power. Cyclic ion mobility with the intelligent design of experiments and processing routines will be a powerful approach addressing the isobaric and isomeric complexity of ultra-complex mixtures.
- Published
- 2021
49. Influence of Nickel on the Microstructure, Mechanical Properties, and Corrosion Resistance of Laser-Welded Super-Duplex Stainless Steel
- Author
-
Vicente Afonso Ventrella, Andrea Zambon, Claudio Gennari, J. Gallego, E. J. da Cruz Junior, Alessio Giorgio Settimi, Fed Inst Sao Paulo, Universidade Estadual Paulista (Unesp), and Univ Padua
- Subjects
inorganic chemicals ,Materials science ,microstructure ,Nd:YAG pulsed Laser Welding ,chemistry.chemical_element ,02 engineering and technology ,Welding ,mechanical properties ,01 natural sciences ,Indentation hardness ,Corrosion ,law.invention ,law ,YAG pulsed laser welding ,Ferrite (iron) ,0103 physical sciences ,Ultimate tensile strength ,Mechanical Properties ,Nickel Addition ,General Materials Science ,Nd ,Microstructure ,010302 applied physics ,Austenite ,corrosion resistance ,Mechanical Engineering ,Metallurgy ,technology, industry, and agriculture ,nickel addition ,Super-Duplex Stainless Steel ,respiratory system ,021001 nanoscience & nanotechnology ,Nickel ,Corrosion Resistance, Mechanical Properties, Microstructure, Nd:YAG pulsed Laser Welding, Nickel Addition, Super-Duplex Stainless Steel ,chemistry ,Mechanics of Materials ,Corrosion Resistance ,super-duplex stainless steel ,0210 nano-technology - Abstract
Made available in DSpace on 2021-06-25T12:40:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-03-19 Coimbra Group Super-duplex stainless steel (SDSS) exhibits an austenite-ferrite dual-phase structure, which promotes many benefits upon single-phase grades, such as high mechanical strength and corrosion resistance. Welding process results in an unbalanced microstructure, with large amount of ferrite, which compromise SDSS's properties. This paper investigates the effect of using electrolytic nickel foils as an addition metal on UNS S32750 SDSS Nd:YAG pulsed laser welding, through the evaluation of the microstructure, hardness, tensile strength, and corrosion resistance of the weld bead. Six conditions were investigated: autogenous welding and with addition of nickel, varying the thickness of nickel foil added. Microstructural analysis reveals an increase in volume fraction of austenite for the conditions with addition of nickel. Using a 30 mu m thick nickel foil, approximately equal amount of austenite and ferrite was obtained in the weld bead. The higher microhardness was obtained for the autogenous welding, 400 HV and decreased with the addition of nickel. The tensile strength decreased 4% in the experimental conditions with high nickel addition. The corrosion resistances were the same for all the conditions with addition on nickel, regardless of the nickel foil thickness added, but it compared to autogenous welding the CPT's increased approximately 14 degrees C. Fed Inst Sao Paulo, Ave Jeronimo Figueira Costa 3014, BR-15503110 Votuporanga, SP, Brazil Sao Paulo State Univ, Dept Mech Engn, Ave Brasil 56, BR-15385000 Ilha Solteira, SP, Brazil Univ Padua, Dept Ind Engn, Via Gradenigo 6-A, I-35131 Padua, Italy Univ Padua, Dept Management & Engn, Stradella S Nicola 3, I-36100 Vicenza, Italy Sao Paulo State Univ, Dept Mech Engn, Ave Brasil 56, BR-15385000 Ilha Solteira, SP, Brazil
- Published
- 2021
50. Use of experimental design techniques for the optimization of the resin distillation process of Pinus elliottii
- Author
-
Afonso Henrique da Silva Júnior, Manoel L. Martins, Arthur Doria Nogueira, and Toni Jefferson Lopes
- Subjects
Optimal test ,Extraction (chemistry) ,Turpentine ,Forestry ,Pulp and paper industry ,law.invention ,Dilution ,%22">Pinus ,chemistry.chemical_compound ,chemistry ,law ,Monetary value ,Oleoresin ,Distillation ,Mathematics - Abstract
Nas últimas décadas, o setor de produtos de resina no Brasil está demonstrando uma perspectiva de demanda crescente para os produtores de goma de resina, o que exige avanços na parte técnica dos processos de extração e purificação. Este trabalho teve como objetivo analisar, através de técnicas de planejamento experimental, os processos de lavagem e destilação da oleorresina de Pinus elliottii. A resina natural foi coletada na região costeira do estado do Rio Grande do Sul, Brasil. Os resultados da etapa de lavagem revelaram que as interações lineares de segunda ordem foi o modelo empírico mais adequado para este estudo. Portanto, o teste ideal foi determinado com os seguintes fatores: temperatura de 50ºC, tempo de 20 min e 20% de terebentina utilizada para a diluição. Para o processo de destilação, o melhor modelo foi o linear sem interações, considerando a resposta do Valor Monetário (Real – R$) por 100 g de resina processada. Assim, determinou-se que a região ótima obteve os seguintes fatores: temperatura entre 156 e 170ºC e tempo entre 61 e 100 minutos. Portanto, o uso de técnicas de planejamento experimental permitiu propor ao produtor algumas alternativas no processamento de resina natural, o que consequentemente causou o aumento do valor agregado ao produto comercializado.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.