Results 31 to 40 of about 858 (120)

Evaluation of nonalcoholic fatty liver disease using magnetic resonance in obese children and adolescents

Jornal de Pediatria (Versão em Português), 2019
Objective: To determine the frequency of nonalcoholic fatty liver disease using nuclear magnetic resonance as a noninvasive method. Methodology: This was a cross‐sectional study conducted on 50 children and adolescents followed up at an outpatient ...
Patrícia O. Benetolo, Maria I.M. Fernandes, Ieda R.L. Del Ciampo, Jorge Elias‐Junior, Regina Sawamura   +4 more
doaj   +3 more sources

Isolamento de antraquinonas de hemorocallis fulva. Liliaceae

Semina: Ciências Exatas e Tecnológicas, 2004
Dos bulbos de Hemerocallis fulva, planta herbácea da família Liliaceae, cinco substâncias foram isoladas, ? -sitosterol e quatro antraquinonas. As determinações estruturais das antraquinonas foram deduzidas pelas análises de dados espectrais de ...
César Cornélio Andrei, Raimundo Braz Filho   +1 more
doaj   +1 more source

Electrochemically Mediated Atom Transfer Radical Polymerization Driven by Alternating Current

Angewandte Chemie, Volume 136, Issue 29, July 15, 2024.
The study introduces alternating current (AC) electrolysis in ATRP using a symmetrical Cu/Cu electrode pair to generate the CuI activator complex and drive the polymerization. Square and sinusoidal waves at 0.1 Hz from an AC generator were used to polymerize many monomers (including functionals) in organic solvent, water, and bulk.
Francesco De Bon, Marco Fantin, Vanessa A. Pereira, Teresa J. Lourenço Bernardino, Armenio C. Serra, Krzysztof Matyjaszewski, Jorge F. J. Coelho   +6 more
wiley   +2 more sources

Avaliação por ressonância magnética nuclear de fístulas peri-anais.

Acta Médica Portuguesa, 2007
Fistula in ano is a frequent disease, which often has a difficult diagnosis and mapping, and comports significant morbidity. Today, Magnetic Resonance (MRI) allows a rapid, simple and precise mapping of peri anal fistula, which leads to a correct ...
Ana Nassauer Mónica, A Costa, C Aleluia
doaj   +1 more source

Os fundamentos quânticos da Ressonância Magnética Nuclear

Revista Brasileira de Ensino de Física
A ressonância magnética nuclear (RMN) encontra inúmeras aplicações em Física, Química, Engenharia e Medicina. Ela é utilizada sobretudo na análise de composição e estrutura de materiais, tanto sólidos quanto líquidos, e na realização de imagens ...
Celia M. Tokarski Dieguez, Lecio V. Montanheiro, L. Berbeka Cleto, Marlio J.C. Bonfim, C.A. Dartora   +4 more
doaj   +1 more source

Manganese Porphyrin‐Catalyzed One‐Pot Oxidation of Lupeol: Efficient Conversion of Its Terminal Alkene Into Carboxylic Acids

Chemistry &Biodiversity, Volume 23, Issue 5, May 2026.
Manganese porphyrin catalyst enables green PhI(OAc)2 oxidation of lupeol in ethyl acetate, achieving 94% conversion and the formation of eight products, including selective C20 olefin transformations and one‐pot conversion of the isopropenyl group to carboxylic acids, all without the need of C3‐OH protection step.
Leila Renan Oliveira, Pedro Fonseca‐Pinheiro, Lucienir Pains Duarte, Diogo Montes Vidal, Grasiely Faria de Sousa, Dayse Carvalho da Silva Martins   +5 more
wiley   +1 more source

Influence of Hornification Treatment and Fiber Length on the Performance of Recycled Polypropylene Composites

Polymer Composites, Volume 47, Issue 5, Page 4793-4803, 10 March 2026.
Study of the influence of hornification treatment and jute and mallow fiber length on the physical, thermal, and mechanical properties of recycled polypropylene (PP) composites. ABSTRACT The growing accumulation of plastic waste has driven its reuse in the development of new composites, with natural fibers emerging as promising reinforcements. However,
Raquel de Sousa Freire, Gabrielle Machado dos Santos, João de Almeida Melo Filho, Holmer Savastano Junior, Virginia Mansanares Giacon   +4 more
wiley   +1 more source

A Dynamic Overview of Antimicrobial Peptides and Their Complexes

Molecules, 2018
In this narrative review, we comprehensively review the available information about the recognition, structure, and dynamics of antimicrobial peptides (AMPs).
Viviane Silva de Paula, Ana Paula Valente   +1 more
doaj   +1 more source

Continuous‐Wave (CW) Photo‐CIDNP NMR Spectroscopy: A Tutorial

Magnetic Resonance in Chemistry, Volume 63, Issue 12, Page 1020-1034, December 2025.
ABSTRACT Photo‐chemically induced dynamic nuclear polarisation (photo‐CIDNP) is a nuclear spin‐selective magnetic resonance phenomenon that has traditionally been used to mechanistically study chemical reactions involving the (transient) formation of radical molecular species, extract EPR observables of short‐lived radicals, probe biomolecular ...
Lars T. Kuhn, Míriam Pérez‐Trujillo
wiley   +1 more source

Aplicações da tomografia de ressonância magnética nuclear como método não-destrutivo para avaliar os efeitos de injúrias mecânicas em goiabas 'Paluma' e 'Pedro Sato' [PDF]

Revista Brasileira de Fruticultura, 2002
Objetivou-se determinar o potencial do uso da tomografia de ressonância magnética, como método não-destrutivo, para avaliar os efeitos das injúrias mecânicas em goiabas.
Ben-Hur Mattiuz, Clovis Isberto Biscegli, José Fernando Durigan   +2 more
doaj   +1 more source