Reactive Systems
Mostrando 13-24 de 326 artigos, teses e dissertações.
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13. Relationship between Electrochemical Parameters, Cytotoxicity Data against Cancer Cells of 3-Thio-Substituted Nor-Beta-Lapachone Derivatives. Implications for Cancer Therapy
Electrochemical methods are powerful in the characterization and design of redox-modulating agents. We, herein, report the electrochemical investigation, in aprotic medium, of eleven synthetic 3-thio-substituted-nor-beta-lapachones, along with the determination of cytotoxic activity and correspondent selectivity index, against several cancer cell lines and o
J. Braz. Chem. Soc.. Publicado em: 2019-03
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14. Oxidative stress and fish immune system: phagocytosis and leukocyte respiratory burst activity
Abstract Molecular oxygen is a necessary compound for all aerobic organisms, although oxygen is a potent oxidant, which can cause oxidative stress (OS). OS occurs when there is an imbalance between the production of oxidant and antioxidants components, are result of normal cell metabolism, and many of these compounds play a fundamental role in several metabo
An. Acad. Bras. Ciênc.. Publicado em: 18/10/2018
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15. Propiedades catalíticas de grafeno dopado con metales de transición
ABSTRACT In this work a study based on the Density Functional Theory of graphene sheets doped with atoms of Fe, Co and Ni is carried out. The functional PBE1PBE and the pseudopotentials LANL2DZ for the metal atoms, and the 6-31G ++ (d) bases for the carbon atoms were adopted. Three systems formed by the substitution of a carbon atom by one of Fe, Co and Ni,
Matéria (Rio J.). Publicado em: 19/07/2018
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16. Inactivation of MarR gene homologs increases susceptibility to antimicrobials in Bacteroides fragilis
ABSTRACT Bacteroides fragilis is the strict anaerobic bacteria most commonly found in human infections, and has a high mortality rate. Among other virulence factors, the remarkable ability to acquire resistance to a variety of antimicrobial agents and to tolerate nanomolar concentrations of oxygen explains in part their success in causing infection and colon
Braz. J. Microbiol.. Publicado em: 2018-03
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17. An insight on the role of photosensitizer nanocarriers for Photodynamic Therapy
ABSTRACT Photodynamic therapy (PDT) is a modality of cancer treatment in which tumor cells are destroyed by reactive oxygen species (ROS) produced by photosensitizers following its activation with visible or near infrared light. The PDT success is dependent on different factors namely on the efficiency of the photosensitizer deliver and targeting ability. In
An. Acad. Bras. Ciênc.. Publicado em: 2018
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18. Antioxidants in dermatology
Abstract The skin cells continuously produce, through cellular respiration, metabolic processes or under external aggressions, highly reactive molecules oxidation products, generally called free radicals. These molecules are immediately neutralized by enzymatic and non-enzymatic systems in a physiological and dynamic balance. In situations where this balance
An. Bras. Dermatol.. Publicado em: 2017-06
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19. An overview about oxidation in clinical practice of skin aging
Abstract Free radicals are unstable chemical species, highly reactive, being formed by cellular entities of different tissues. Increased production of these species without proper effective action of endogenous and exogenous antioxidant systems, generates a condition of oxidative stress, potentially provider of skin disorders that extend from functional impa
An. Bras. Dermatol.. Publicado em: 2017-06
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20. A DETERMINAÇÃO DOS PRODUTOS AVANÇADOS DE GLICAÇÃO (AGES) E DE LIPOXIDAÇÃO (ALES) EM ALIMENTOS E EM SISTEMAS BIOLÓGICOS: AVANÇOS, DESAFIOS E PERSPECTIVAS
Advanced glycation (AGEs) and lipoxidation (ALEs) products are formed through specific condensation reactions between nucleophiles (amino groups of free amino acids or their residues in peptides, aminophospholipids or proteins) and electrophiles (carbonyls of reducing sugars, oxidized lipids or others) generating well-defined sets of covalent adducts. The ε
Quím. Nova. Publicado em: 2016-06
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21. Comparison of therapeutic effects of L-Thyroxin, apelin and a combination of both on antioxidant enzymes in the heart of PTU-induced hypothyroid rats
Atherosclerosis is one of the common disorders among hypothyroidism, which, increased the risk of cardiovascular diseases. Reactive oxygen species are associated with atherosclerosis development. Antioxidant defense systems are the scavenger for free radicals. Apelin is an endogenous ligand for the APJ receptor (apelin receptor) that exists in most tissues,
Braz. arch. biol. technol.. Publicado em: 22/03/2016
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22. Nanotechnology, Light and Chemical Action: an Effective Combination to Kill Cancer Cells
Photodynamic therapy (PDT) is a minimally invasive and effective procedure for treatment of cancer, based on the combination of a drug (photosensitizer, PS), light (visible or near-infrared, NIR) and induced local formation of reactive oxygen species (ROS) and radicals. Despite its less significant side effects as compared with conventional therapies, many e
J. Braz. Chem. Soc.. Publicado em: 2015-12
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23. Numerical Study of the b-Ξ Flame Wrinkling Combustion Model in Oracles Test Rig
ABSTRACT: Numerical modeling of premixed combustion is important for a wide range of machines and systems focusing on compliance with the increasing pollutants reduction requirements. However good industrial numerical combustion models need a practical requiring, in this way, a balance between speed and accuracy. The flamelet models are suitable for this pur
J. Aerosp. Technol. Manag.. Publicado em: 2015-12
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24. IL-6 and TNF-α serum levels are associated with early death in community-acquired pneumonia patients
Community-acquired pneumonia (CAP) is amongst the leading causes of death worldwide. As inflammatory markers, cytokines can predict outcomes, if interpreted together with clinical data and scoring systems such as CURB-65, CRB, and Acute Physiology and Chronic Health Evaluation II (APACHE II). The aim of this study was to determine the impact of inflammatory
Braz J Med Biol Res. Publicado em: 24/02/2015