Browsing by Subject "EPR"

Application of electron paramagnetic resonance Spectroscopy for validation of the novel (AN plus DN) solvent polarity scale

Malavolta, Luciana [UNIFESP]; Poletti, Erick F. [UNIFESP]; Silva, Elias H. [UNIFESP]; Schreier, Shirley; Nakaie, Clovis R. [UNIFESP] (Mdpi Ag, 2008-07-01)

Based on solvation studies of polymers, the sum (1: 1) of the electron acceptor (AN) and electron donor (DN) values of solvents has been proposed as an alternative polarity scale. To test this, the electron paramagnetic ...

Biological effects of anionic meso-tetrakis (para-sulfonatophenyl) porphyrins modulated by the metal center. Studies in rat liver mitochondria

Pessoto, Felipe Samuel [UNIFESP]; Inada, Natalia Mayumi; Nepomuceno, Maria de Fatima; Ruggiero, Ana Celia; Nascimento, Otaciro R.; Vercesi, Anibal E.; Nantes, Iseli L. (Elsevier B.V., 2009-10-30)

In this paper, we present a study about the influence of the porphyrin metal center and mesa ligands on the biological effects of meso-tetrakis porphyrins. Different from the cationic meso-tetrakis 4-N-methyl pyridinium ...

Centers responsible for the TL peaks of willemite mineral estimated by EPR analysis

Rao, T. K. Gundu; Cano, Nilo Francisco [UNIFESP]; Silva-Carrera, Betzabel Noemi; Ferreira, Reinaldo M.; Javier-Ccallata, Henry S.; Watanabe, Shigueo (Elsevier Science Bv, 2016)

The mineral willemite (Zn2SiO4) exhibits five thermoluminescence (TL) peaks approximately at 160, 225, 260, 310 and 400 degrees C. Electron paramagnetic resonance (EPR) studies were carried out to study the defect centers ...

Characterization of a conformationally sensitive TOAC spin-labeled substance P

Shafer, Aaron M.; Nakaie, Clovis R. [UNIFESP]; Deupi, Xavier; Bennett, Vicki J.; Voss, John C. (Elsevier B.V., 2008-11-01)

To probe the binding of a peptide agonist to a G-protein coupled receptor in native membranes, the spin-labeled amino acid analogue 4-amino-4-carboxy-2,2,6,6-tetramethyl-piperidino-1-oxyl (TOAC) was substituted at either ...

Conformational basis for the biological activity of TOAC-labeled angiotensin II and Bradykinin: Electron paramagnetic resonance, circular dichroism, and fluorescence studies

Schreier, S.; Barbosa, SR; Casallanovo, F.; Vieira, RDF; Cilli, E. M.; Paiva, ACM; Nakaie, C. R. (Wiley-Blackwell, 2004-08-05)

N-Terminally and internally labeled analogues of the hormones angiotensin (All, DRVYIHPF) and bradykinin (BK, RPPGFSPFR) were synthesized containing the paramagnetic amino acid 2,2,6,6-tetramethylpiperidine-1-oxyl-4-amin ...

Conformational Properties of Angiotensin II and Its Active and Inactive TOAC-Labeled Analogs in the Presence of Micelles. Electron Paramagnetic Resonance, Fluorescence, and Circular Dichroism Studies

Vieira, Renata de Freitas Fischer [UNIFESP]; Casallanovo, Fabio; Marin, Nelida; Paiva, Antonio Cechelli de Mattos [UNIFESP]; Schreier, Shirley; Nakaie, Clovis Ryuichi [UNIFESP] (Wiley-Blackwell, 2009-01-01)

The interaction between angiotensin II (AII, DRVYIHPF) and its analogs carrying 2,2,6,6-tetramethylpiperidine-1-oxyl-4-amino-4-carboxylic acid (TOAC) and detergents-negatively charged sodium dodecyl sulfate (SDS) and ...

Conformational studies of TOAC-labeled bradykinin analogues in model membranes

Vieira, Renata de Freitas Fischer [UNIFESP]; Casallanovo, Fabio; Cilli, Eduardo Maffud [UNIFESP]; Paiva, Antonio Cechelli de Mattos [UNIFESP]; Schreier, Shirley; Nakaie, Clovis Ryuichi [UNIFESP] (Kluwer Academic Publ, 2002-01-01)

Spin-labeled analogues of bradykinin (BK) were synthesized containing the amino acid TOAC ( 2,2,6,6-tetramethylpiperidine-1-oxyl-4-amino-4-carboxylic acid) either before Arg(1) (TOAC(0)-BK) or replacing Pro(3) (TOAC(3)-BK). ...

Dating and determination of firing temperature of ancient potteries from São Paulo II archaeological site, Brazil by TL and EPR techniques

Cano, Nilo Francisco [UNIFESP]; Ribeiro, Rogerio Baria; Munita, Casimiro Jaime Alfredo Sepúlveda; Watanabe, Shigueo; Neves, Eduardo Goes; Tamanaha, Eduardo Kazuo (Elsevier B.V., 2015-05-01)

Pottery fragments from São Paulo II (SPII) archaeological site were dated by means of thermoluminescence (TL) and electron paramagnetic resonance (EPR). EPR was used to study the firing temperature using the iron signal ...

Dating stalagmite from Caverna do Diabo (Devil'S Cave) by TL and EPR techniques

Watanabe, Shigueo; Cano, Nilo Francisco [UNIFESP]; Rao, T. K. Gundu; Silva-Carrera, Betzabel Noemi; Carmo, Lucas Sátiro do; Quina, Antonio de Jesus Alves de; Gennari, Roseli Fernandes; Munita, Casimiro Jaime Alfredo Sepúlveda; Ayala-Arenas, Jorge S.; Fernandes, Bruno G. (Acad Brasileira De Ciencias, 2016)

A cylindrical fragment of stalagmite from Caverna do Diabo, State of Sao Paulo, Brazil, has been studied and dated by thermoluminescence and electron paramagnetic resonance techniques. The thermoluminescence glow curves ...

Effect of polysaccharide capsule of the microalgae Staurastrum iversenii var. americanum on diffusion of charged and uncharged molecules, using EPR technique

Freire-Nordi, Cristina Souza [UNIFESP]; Vieira, Armando A. H.; Nakaie, Clovis Ryuichi [UNIFESP]; Nascimento, Otaciro R. (Sociedade Brasileira de Física, 2006-03-01)

The existence of a mucilaginous envelope, sheath or capsule is usual in many desmids, but few data concerning its function are available. Previous studies of the transport function and permeation of molecules through the ...