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Ezeh N, Ardalan K, Buhr KA, Nguyen C, Al Ahmed O, Ardoin SP, Barton V, Bell S, Brandling-Bennett H, Castelo-Soccio L, Chiu YE, Chong BF, Lara-Corrales I, Cintosun A, Curran ML, Diaz LZ, Elman SA, Faith EF, Garcia-Romero MT, Grossman-Kranseler J, Hogeling M, Hudson AD, Hunt RD, Ibler EM, Marques MC, Monir RL, Oza V, Paller AS, Putterman E, Rodriguez-Salgado P, Schoch JJ, Truong A, Wang J, Lee LW, Vleugels RA, Klein-Gitelman MS, von Scheven E, Werth VP, Arkin LM. Cross-Sectional Characteristics of Pediatric-Onset Discoid Lupus Erythematosus: Results of a Multicenter, Retrospective Cohort Study. J Am Acad Dermatol 2022; 87:559-566. [PMID: 35487332 PMCID: PMC10082546 DOI: 10.1016/j.jaad.2022.04.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 04/07/2022] [Accepted: 04/08/2022] [Indexed: 11/15/2022]
Abstract
• Discoid lupus may be associated with SLE. In this study, most children with discoid lupus did not have systemic disease. Concurrent SLE was highest in female adolescents (>10 years of age) with generalized discoid lupus, who had clinically aggressive disease. • Discoid lupus in adolescence should prompt thorough evaluation for SLE.
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Affiliation(s)
- N Ezeh
- University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - K Ardalan
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, Departments of Pediatrics and Medical Social Sciences, Northwestern University Feinberg School of Medicine/Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL
| | - K A Buhr
- Department of Biostatistics & Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - C Nguyen
- University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - O Al Ahmed
- Department of Pediatrics, Nationwide Children's Hospital/Ohio State University, Columbus OH
| | - S P Ardoin
- Department of Pediatrics, Nationwide Children's Hospital/Ohio State University, Columbus OH
| | - V Barton
- Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina, Charleston, SC
| | - S Bell
- Department of Pediatrics, Division of Rheumatology, University of California at San Francisco, San Francisco, CA
| | - H Brandling-Bennett
- Division of Dermatology; Department of Pediatrics, Seattle Children's Hospital/University of Washington School of Medicine, Seattle, WA
| | - L Castelo-Soccio
- Children's Hospital of Philadelphia, Department of Pediatrics, Section of Dermatology, Children's Hospital of Philadelphia, Philadelphia, PA
| | - Y E Chiu
- Departments of Dermatology (Section of Pediatric Dermatology) and Pediatrics, Medical College of Wisconsin, Milwaukee, WI
| | - B F Chong
- Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, TX; Department of Pediatrics, Division of Allergy/Immunology/Rheumatology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - I Lara-Corrales
- Department of Pediatrics, Section of Dermatology, The Hospital for Sick Children/University of Toronto, Toronto, ON
| | - A Cintosun
- Department of Pediatrics, Section of Dermatology, The Hospital for Sick Children/University of Toronto, Toronto, ON
| | - M L Curran
- Department of Pediatrics, Section of Rheumatology, Children's Hospital Colorado/University of Colorado School of Medicine, Aurora, CO
| | - L Z Diaz
- Department of Pediatrics, Division of Dermatology, Dell Medical School/Dell Children's Hospital, Austin, TX
| | - S A Elman
- Department of Dermatology, Boston's Children Hospital/Harvard Medical School, Boston, MA
| | - E Fernandez Faith
- Department of Pediatrics, Nationwide Children's Hospital/Ohio State University, Columbus OH
| | - M T Garcia-Romero
- Department of Dermatology, National Institute for Pediatrics, Mexico City, MX
| | - J Grossman-Kranseler
- Division of Dermatology; Department of Pediatrics, Seattle Children's Hospital/University of Washington School of Medicine, Seattle, WA
| | - M Hogeling
- Department of Dermatology, University of California at Los Angeles, Los Angeles, CA
| | - A D Hudson
- Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, TX
| | - R D Hunt
- Department of Dermatology and Pediatrics, Texas Children's Hospital, Houston, TX
| | - E M Ibler
- Departments of Dermatology (Section of Pediatric Dermatology) and Pediatrics, Medical College of Wisconsin, Milwaukee, WI
| | - M C Marques
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD
| | - R L Monir
- Department of Dermatology, University of Florida School of Medicine, Gainesville, FL
| | - V Oza
- Departments of Pediatrics and Dermatology, New York University Grossman School of Medicine, New York, NY
| | - A S Paller
- Departments of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine/Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL
| | - E Putterman
- Children's Hospital of Philadelphia, Department of Pediatrics, Section of Dermatology, Children's Hospital of Philadelphia, Philadelphia, PA
| | - P Rodriguez-Salgado
- Department of Dermatology, National Institute for Pediatrics, Mexico City, MX
| | - J J Schoch
- Department of Dermatology, University of Florida School of Medicine, Gainesville, FL
| | - A Truong
- Department of Dermatology, University of California at Los Angeles, Los Angeles, CA
| | - J Wang
- Departments of Pediatrics and Dermatology, New York University Grossman School of Medicine, New York, NY
| | - L Wine Lee
- Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina, Charleston, SC
| | - R A Vleugels
- Department of Dermatology, Boston's Children Hospital/Harvard Medical School, Boston, MA
| | - M S Klein-Gitelman
- Department of Pediatrics, Northwestern University Feinberg School of Medicine/Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL
| | - E von Scheven
- Department of Pediatrics, Division of Rheumatology, University of California at San Francisco, San Francisco, CA
| | - V P Werth
- Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania and Corporal Michael J. Crescenz VAMC, Philadelphia, PA
| | - L M Arkin
- Departments of Dermatology and Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI.
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Rodrigues DB, Marques MC, Hacke A, Loubet Filho PS, Cazarin CBB, Mariutti LRB. Trust your gut: Bioavailability and bioaccessibility of dietary compounds. Curr Res Food Sci 2022; 5:228-233. [PMID: 35106487 PMCID: PMC8787780 DOI: 10.1016/j.crfs.2022.01.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 12/26/2022] Open
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Marques MC, Perina NP, Mosquera EMB, Tomé TM, Lazarini T, Mariutti LRB. DHA bioaccessibility in infant formulas and preschool children milks. Food Res Int 2021; 149:110698. [PMID: 34600692 DOI: 10.1016/j.foodres.2021.110698] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 11/17/2022]
Abstract
Docosahexaenoic acid (DHA, 22:6n-3) is an essential long chain polyunsaturated fatty acid associated with the development of the nervous system that has to be consumed by infants through breast milk or complementary food sources and which consumption is also usually inadequate in preschoolers. In this work, the in vitro bioaccessibility of DHA from two commercial infant formulas (8.9 and 9.1%) and two preschool children milks (6.9 and 7.2%), with similar DHA contents but formulated with different ingredients, was not improved by the presence of egg phospholipids in the product formulation. In addition, the importance of the choice of an age-appropriate in vitro digestion method was demonstrated by comparing the DHA bioaccessibility from the infant formulas by the Infogest 2.0 standardized method and a simulated digestion method specific for infants.
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Affiliation(s)
- M C Marques
- School of Food Engineering, University of Campinas, São Paulo, Brazil
| | - N P Perina
- Medical, Scientific and Regulatory Affairs - Nestlé Nutrition / Nestlé Brazil Ltda, São Paulo, Brazil
| | - E M B Mosquera
- Medical, Scientific and Regulatory Affairs - Nestlé Nutrition / Nestlé Brazil Ltda, São Paulo, Brazil
| | - T M Tomé
- Medical, Scientific and Regulatory Affairs - Nestlé Nutrition / Nestlé Brazil Ltda, São Paulo, Brazil
| | - T Lazarini
- Medical, Scientific and Regulatory Affairs - Nestlé Nutrition / Nestlé Brazil Ltda, São Paulo, Brazil
| | - L R B Mariutti
- School of Food Engineering, University of Campinas, São Paulo, Brazil.
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Venancio VP, Marques MC, Almeida MR, Mariutti LRB, Souza VCDO, Barbosa F, Pires Bianchi ML, Marzocchi-Machado CM, Mercadante AZ, Antunes LMG. Chrysobalanus icaco L. fruits inhibit NADPH oxidase complex and protect DNA against doxorubicin-induced damage in Wistar male rats. J Toxicol Environ Health A 2016; 79:885-893. [PMID: 27494754 DOI: 10.1080/15287394.2016.1193454] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 05/20/2016] [Indexed: 06/06/2023]
Abstract
Chrysobalanus icaco L. is an underexplored plant found in tropical areas around the globe. Currently, there is no apparent information regarding the effects C. icaco fruits may exert in vivo or potential role in health promotion. This study aimed at providing evidence regarding the in vivo influence of this fruit on antigenotoxicity, antimutagenicity, and oxidative stress in rats. Male Wistar rats were treated with 100, 200, or 400 mg/kg body weight (bw)/d C. icaco fruit for 14 d. Doxorubicin (DXR, 15 mg/kg bw, ip) was used for DNA damaging and as an oxidant to generate reactive oxygen species (ROS). Genomic instability was assessed by the comet assay and micronucleus (MN) test, while antioxidant activity was determined by oxidative burst of neutrophils. Chrysobalanus icaco fruit polyphenols were quantified and characterized by high-performance liquid chromatography coupled to a diode array detector and tandem mass spectrometer (HPLC-DAD-MS/MS). The concentrations of 19 chemical elements were determined by inductively coupled plasma-mass spectroscopy (ICP-MS). Significant amounts of polyphenols, magnesium, and selenium were found in C. icaco fruit. This fruit displayed in vivo antioxidant activity against DXR-induced damage in rat peripheral blood neutrophils, antigenotoxicity in peripheral blood cells, and antimutagenicity in bone-marrow cells and peripheral blood cells. Correlation analyses between endpoints examined indicated that the mechanism underlying chemopreventive actions of C. icaco fruit was attributed to inhibition of NADPH oxidase complex manifested as low levels of DNA damage in animals exposed to DXR. Data indicate that phytochemicals and minerals in C. icaco fruit protect DNA against damage in vivo associated with their antioxidant properties.
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Affiliation(s)
- Vinicius Paula Venancio
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
| | | | - Mara Ribeiro Almeida
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
| | | | | | - Fernando Barbosa
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - Maria Lourdes Pires Bianchi
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
| | - Cleni Mara Marzocchi-Machado
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
| | | | - Lusânia Maria Greggi Antunes
- a School of Pharmaceutical Sciences of Ribeirão Preto , University of São Paulo , Ribeirão Preto , São Paulo , Brazil
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Figueira ME, Câmara MB, Direito R, Rocha J, Serra AT, Duarte CMM, Fernandes A, Freitas M, Fernandes E, Marques MC, Bronze MR, Sepodes B. Chemical characterization of a red raspberry fruit extract and evaluation of its pharmacological effects in experimental models of acute inflammation and collagen-induced arthritis. Food Funct 2015; 5:3241-51. [PMID: 25322288 DOI: 10.1039/c4fo00376d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Berries are an important dietary source of fibres, vitamins, minerals and some biologically active non-nutrients. A red raspberry fruit extract was characterized in terms of phenolic content and the anti-inflammatory properties and protective effects were evaluated in two experimental models of inflammation. The antioxidant potential of the extract, the cellular antioxidant activity and the effects over neutrophils' oxidative burst were also studied to provide a mechanistic insight for the anti-inflammatory effects observed. The extract was administered in a dose of 15 mg kg(-1), i.p. and significantly inhibited paw oedema formation in the rat. The same dose was administered via i.p. and p.o. routes in the collagen-induced arthritis model in the rat. The extract showed pharmacological activity and was able to significantly reduce the development of clinical signs of arthritis and markedly reduce the degree of bone resorption, soft tissue swelling and osteophyte formation, preventing articular destruction in treated animals.
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Affiliation(s)
- M E Figueira
- iMED.ULisboa, Faculdade de Farmácia da Universidade de Lisboa, Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal.
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Marques MC, Gabbett TJ, Marinho DA, Blazevich AJ, Sousa A, van den Tillaar R, Izquierdo M. Influence of Strength, Sprint Running, and Combined Strength and Sprint Running Training on Short Sprint Performance in Young Adults. Int J Sports Med 2015; 36:789-95. [PMID: 25958946 DOI: 10.1055/s-0035-1547284] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The purpose of this study was to assess the degree of transference of 6 weeks of full squat vs. full squat plus sprint running training to short (ranged from 0-10 to 0-30 m) sprint running performance in non-athletes. We hypothesized that a speed-full-squat training regimen could enhance squat strength and power with simultaneous improvements in short sprint performance. 122 physically active adults (age: 20.5±2.5 years; body mass: 65.8±6.1 kg; height: 1.71±0.08 m) were randomly divided into 4 groups: full squat training (n=36), combined full squat and sprint training (n=32), speed training only (n=34) and non-training control group (n=20). Each training group completed 2 sessions per week over 6 weeks, while the control group performed only their normal physical activity. Sprint performance was improved after sprint running or full squat training alone (1.7% and 1.8% P<0.05, respectively), however larger enhancements (2.3%; P<0.01) were observed after the combined full squat plus sprint training intervention. These results suggest that in recreationally active adults, combined full squat and sprint training provides a greater stimulus for improving sprint performance than either modality alone.
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Affiliation(s)
- M C Marques
- Department of Sports Sciences, University of Beira Interior, Covilhã, Portugal
| | - T J Gabbett
- School of Exercise Science, Australian Catholic University, Brisbane, Australia
| | - D A Marinho
- Department of Sports Sciences, University of Beira Interior, Covilhã, Portugal
| | - A J Blazevich
- Center for Exercise and Sports Science Research, Edith Cowan University, Joondalup, Australia
| | - A Sousa
- Department of Sports Sciences, University of Beira Interior, Covilhã, Portugal
| | | | - M Izquierdo
- Department of Health Sciences, Public University of Navarra, Pamplona, Spain
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Forment J, Gadea J, Huerta L, Abizanda L, Agusti J, Alamar S, Alos E, Andres F, Arribas R, Beltran JP, Berbel A, Blazquez MA, Brumos J, Canas LA, Cercos M, Colmenero-Flores JM, Conesa A, Estables B, Gandia M, Garcia-Martinez JL, Gimeno J, Gisbert A, Gomez G, Gonzalez-Candelas L, Granell A, Guerri J, Lafuente MT, Madueno F, Marcos JF, Marques MC, Martinez F, Martinez-Godoy MA, Miralles S, Moreno P, Navarro L, Pallas V, Perez-Amador MA, Perez-Valle J, Pons C, Rodrigo I, Rodriguez PL, Royo C, Serrano R, Soler G, Tadeo F, Talon M, Terol J, Trenor M, Vaello L, Vicente O, Vidal C, Zacarias L, Conejero V. Development of a citrus genome-wide EST collection and cDNA microarray as resources for genomic studies. Plant Mol Biol 2005; 57:375-91. [PMID: 15830128 DOI: 10.1007/s11103-004-7926-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Accepted: 12/20/2004] [Indexed: 05/20/2023]
Abstract
A functional genomics project has been initiated to approach the molecular characterization of the main biological and agronomical traits of citrus. As a key part of this project, a citrus EST collection has been generated from 25 cDNA libraries covering different tissues, developmental stages and stress conditions. The collection includes a total of 22,635 high-quality ESTs, grouped in 11,836 putative unigenes, which represent at least one third of the estimated number of genes in the citrus genome. Functional annotation of unigenes which have Arabidopsis orthologues (68% of all unigenes) revealed gene representation in every major functional category, suggesting that a genome-wide EST collection was obtained. A Citrus clementina Hort. ex Tan. cv. Clemenules genomic library, that will contribute to further characterization of relevant genes, has also been constructed. To initiate the analysis of citrus transcriptome, we have developed a cDNA microarray containing 12,672 probes corresponding to 6875 putative unigenes of the collection. Technical characterization of the microarray showed high intra- and inter-array reproducibility, as well as a good range of sensitivity. We have also validated gene expression data achieved with this microarray through an independent technique such as RNA gel blot analysis.
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Affiliation(s)
- J Forment
- Instituto de Biologíia Molecular y Celular de Plantas (IBMCP), Universidad Politécnica de Valencia, Laboratorio de Genómica, Spain
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Odor G, Marques MC, Santos MA. Phase transition of a two-dimensional binary spreading model. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:056113. [PMID: 12059653 DOI: 10.1103/physreve.65.056113] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2002] [Indexed: 05/23/2023]
Abstract
We investigated the phase transition behavior of a binary spreading process in two dimensions for different particle diffusion strengths (D). We found that N>2 cluster mean-field approximations must be considered to get consistent singular behavior. The N=3,4 approximations result in a continuous phase transition belonging to a single universality class along the D subset (0,1) phase transition line. Large scale simulations of the particle density confirmed mean-field scaling behavior with logarithmic corrections. This is interpreted as numerical evidence supporting the bosonic field theoretical prediction that the upper critical dimension in this model is d(c)=2. The pair density scales in a similar way but with an additional logarithmic factor to the order parameter. At the D=0 end point of the transition line we found directed percolation criticality.
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Affiliation(s)
- G Odor
- Research Institute for Technical Physics and Materials Science, P. O. Box 49, H-1525 Budapest, Hungary
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Villa de Brito MT, Canto A, Duarte Correia JH, Cunha RA, Marques MC. Adenosine A(2A) receptors in portal hypertension: their role in the abnormal response to adenosine of the cranial mesenteric artery in rabbits. Br J Pharmacol 2002; 135:1324-30. [PMID: 11877342 PMCID: PMC1573239 DOI: 10.1038/sj.bjp.0704575] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. Adenosine is a regulator of mesenteric vasodilation involved in auto-regulation and post-prandial hyperemia, but the adenosine receptor subtype involved in this relaxant effect is poorly characterized. We have now pharmacologically characterized this receptor in rabbit mesenteric arteries and investigated how this adenosine receptor response changes in portal hypertensive animals since the adenosine response is decreased. 2. The closest non-metabolisable adenosine analogue, 2-chloroadenosine (CADO), the mixed A(1)/A(2) receptor agonist, 5'-ethylcarboxamidoadenosine (NECA), and the selective A(2A) receptor agonist, 2-[4-(2-p-carbonyethyl)phenylamino]-5'-N-ethylcarboxamidoadenosine (CGS 21680) (1 pM -- 1 mM) relaxed noradrenaline pre-contracted arteries with a rank order of potency of CGS 21680 (EC(50)=20 nM) > or = NECA (60 nM)>>CADO (640 nM). 3. The selective A(2A) receptor antagonist, 4-(2-[7-amino-2-(2-furyl)-[1,2,4]-triazolo[2,3-a][1,3,5]-triazin-5-ylamino]ethyl)phenol (ZM 241385, 100 nM), shifted to the right the CADO concentration-response curve. 4. In portal hypertensive animals, there was mainly a decreased potency but also a decreased efficacy of all tested adenosine agonists compared to normal animals. Concomitantly, there was a decreased adenosine plasma level and a decreased binding density of [(3)H]-CGS 21680 and [(3)H]-ZM 241385 to mesenteric artery membranes from portal hypertensive compared to normal rabbits. 5. These results indicate that A(2A) receptor activation is required for the adenosine-induced mesenteric relaxation and that the decreased density of A(2A) receptors may contribute to the decreased relaxation induced by adenosine of mesenteric arteries in portal hypertensive animals.
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Affiliation(s)
- M T Villa de Brito
- CIISA, Faculty of Veterinary Medicine, Lisbon Technical University, Lisbon, Portugal
| | - A Canto
- Laboratory of Neurosciences, Faculty of Medicine, University of Lisbon, Portugal
| | - J H Duarte Correia
- CIISA, Faculty of Veterinary Medicine, Lisbon Technical University, Lisbon, Portugal
| | - R A Cunha
- Laboratory of Neurosciences, Faculty of Medicine, University of Lisbon, Portugal
- Center for Neurosciences of Coimbra, Department of Biochemistry, Faculty of Medicine, University of Coimbra, Portugal
- Author for correspondence:
| | - M C Marques
- Laboratory of Pathophysiology, Faculty of Pharmacy, University of Lisbon, Portugal
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Marques MC, Santos MA, Mendes JFF. Static critical behavior in the inactive phase of the pair contact process. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:016111. [PMID: 11800740 DOI: 10.1103/physreve.65.016111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2001] [Indexed: 05/23/2023]
Abstract
Steady-state properties in the absorbing phase of the 1d pair contact process model are investigated. It is shown that, in typical absorbing states (reached by the system's dynamic rules), the density of isolated particles rho(1), approaches a stationary value that depends on the annihilation probability (p); the deviation from its "natural" value at criticality rho(nat)(1) follows a power law: rho(nat)(1)-rho(1) approximately (p-p(c))(beta(1)) for p>p(c). Monte Carlo simulations yield beta(1)=0.81. A cluster approximation is developed for this model, qualitatively confirming the numerical results and predicting beta(1)=1. The singular behavior of the isolated particles density in the inactive phase is explained using a phenomenological approach.
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Affiliation(s)
- M C Marques
- Departamento de Física and Centro de Física do Porto, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
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Marques MC. Critical behavior of a nonequilibrium system with two nonordering conserved fields. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 64:016104. [PMID: 11461328 DOI: 10.1103/physreve.64.016104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2001] [Indexed: 05/23/2023]
Abstract
We investigate the critical behavior of a nonequilibrium system with two particle species A and B that exhibits a continuous absorbing-state phase transition. The number of particles of each species (N(A) and N(B)) is conserved by the dynamical process. Numerical results show that the order parameter exponent beta depends on the ratio N(B)/N(A) at criticality. Some aspects of critical dynamic behavior are also studied, namely, the decay of the active density at criticality and the critical spreading of a perturbation to an absorbing configuration. Anomalies in the relaxation are associated with the presence of different time scales in the dynamics of the model.
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Affiliation(s)
- M C Marques
- Departamento de Física and Centro de Física do Porto, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
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Rodrigues VC, Bertolozzi MR, Marques MC. [Approach to the reality of life and health at "Recanto de Alegria" community: understanding and defining the strategy of intervention]. Rev Lat Am Enfermagem 1998; 6:83-93. [PMID: 9823240 DOI: 10.1590/s0104-11691998000400011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This article presents a process of investigation that was developed to identify life and health conditions of a community in order to propose changing strategies to the situation. It took place in Distrito do Grajaú (SP)--Brazil. All families were interviewed through the application of a survey in order to find personal/life conditions, and a health disease process profile. Data reveal a determined profile that was presented to the people to implement integrated actions to solve the main problems/issues at the community.
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De Beuckeleer L, De Schepper A, De Belder F, Van Goethem J, Marques MC, Broeckx J, Verstraete K, Vermaut F. Magnetic resonance imaging of localized giant cell tumour of the tendon sheath (MRI of localized GCTTS). Eur Radiol 1997; 7:198-201. [PMID: 9038114 DOI: 10.1007/s003300050134] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The objective of this study was to evaluate the appearance of localized giant cell tumour of the tendon sheath (GCTTS) on unenhanced and Gd-enhanced MR images. MR images of 13 histologically proven cases of localized GCTTS were evaluated for mean size, location, homogeneity and signal intensity (SI) on both T1- and T2-weighted images, and enhancement pattern. All lesions except 1 affected young adults. On T1- and T2-weighted images, lesions showed predominantly low SI equal to or slightly higher than skeletal muscle. On Gd-enhanced T1-weighted images, strong homogeneous enhancement was seen. These findings reflect the underlying histological composition of the lesion; haemosiderin deposition in xanthoma cells, shortening T2-relaxation time, and abundant collagenous proliferation are responsible for low SI on T1- and T2-weighted images. Strong homogeneous enhancement originates from numerous proliferative capillaries in the collagenous stroma. We conclude that these characteristic MR features, together with clinical information, are a valuable diagnostic tool in offering a correct preoperative diagnosis.
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Affiliation(s)
- L De Beuckeleer
- Department of Radiology, Universitair Ziekenhuis Antwerpen, B-2650 Edegem, Belgium
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Rodrigues L, Silva-Carvalho L, Fresta M, Henriques JP, Rocha I, Marques MC, Bettencourt MH, Escalda A, Silva-Carvalho J. [Primary effect of carotid body stimulation on left ventricular inotropism in swine]. Rev Port Cardiol 1992; 11:431-7. [PMID: 1520496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The cardiovascular response to carotid body stimulation has been a interesting and simultaneously controversial subject. In fact, several authors described different responses depending on the animal species used (cat, dog, rabbit, monkey), time of stimulation (short-term v. long-term) and experimental conditions and procedures. According to our experience, the response to carotid body stimulation with cyanide, in normal breathing dogs, consists in hyperpnoea, bradycardia with arterial blood pressure fall (by means of longer diastolic periods), followed by a marked rise in arterial blood pressure and heart rate, after curarization. Concerning the inotropic response to carotid chemoreceptors stimulation, there exists some controversial and even antagonic opinions. In fact, some authors describe a positive inotropic effect, others a negative inotropic effect, and others still defend no inotropic response at all. In the present work, the authors try to contribute to the solution of this problem, studying a group of animals (pig) anaesthetised with chloralose, in which the major modulators of the inotropic response to carotid body stimulation (ventilation; heart rate; and ventricular load conditions) were controlled. To the evaluation of cardiac contractile state, indexes derived from the systolic isovolumic phase were used (maximum left ventricular pressure, dP/dtmax; dP/dtmin) in all the animals. In some animals, other indexes were also used (Vmax, Vpm, (dP/dt)/DP40, Tau and PB). The authors concluded that, in the present experimental conditions, the primary response to carotid body stimulation, in the pig, includes a positive inotropic effect.
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Affiliation(s)
- L Rodrigues
- Laboratório de Fisiologia, Faculdade de Farmácia, Universidade de Lisboa
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Marques MC, Ladosky EM, Fonteles MC. The presynaptic effects of aspirin and prostaglandin E2 in the isolated cat heart. Braz J Med Biol Res 1983; 16:133-40. [PMID: 6317103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The presynaptic effects of aspirin and prostaglandin E2 (PGE2) were evaluated in the isolated perfused cat heart preparation. Tissue catecholamine stores were studied by labelling the sympathetic nerve endings with [3H]-noradrenaline ([3H]-NA) and the effect of electric neural stimulation (5 Hz, 0.5 ms, 8 V, 60 s) was determined in the presence of drugs which inhibit neuronal or extraneuronal uptake, or antagonize alpha-adrenoceptors. [3H]-NA overflow was significantly increased by electric neural stimulation. Perfusion with 0.1 microM phentolamine increased transmitter overflow. Infusion of 0.1 microM PGE2 reduced the [3H]-NA overflow induced by electrical stimulation. Administration of 1 microM aspirin increased the [3H]-NA overflow and PGE2 prevented this effect of aspirin. The results support the view that PGEs participate in the negative feedback of transmitter release in the isolated perfused cat heart.
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