Results 21 to 30 of about 876 (122)

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

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

Continuous‐Flow Microfluidic Synthesis Enhances C2+ Selectivity for Cu2O Catalysts

Advanced Science, Volume 13, Issue 55, 5 October 2026.
Microfluidic devices are used to prepare Cu2O nanoparticles under laminar flow conditions, which exhibit enhanced selectivity in the CO2‐to‐C2+ reaction due to their nanoporosity and high defect concentration. Cu2O prepared using standard solution methods displays decreased CO2‐to‐C2+ selectivity due to the absence of similar properties. Altogether, we
Carlota Casas, Anh Tuan Ngo, João Pedro Vale, Ona Falcó, Gerard Martí, Mohamed Amazian, Júlia Mayans, Sònia Estradé, Marcos Gil‐Sepulcre, Teresa Andreu, Francesca Peiró, Tiago Sotto Mayor, Lluís Yedra, Jordi García‐Antón, Josep Puigmartí‐Luis, Xavier Sala, Roc Matheu   +16 more
wiley   +1 more source

Green Electrochromic Film Formation via Phenylcarbazole Polymerization in Ionic Liquids

Chemistry – A European Journal, Volume 32, Issue 31, 18 August 2026.
The scheme depicts the three‐step electropolymerization of two electrochromic polycarbazole derivatives, 4‐(9H‐carbazol‐9‐yl)phenol and 4‐(3‐methoxy‐9H‐carbazol‐9‐yl)phenol, performed at constant potential using the green ionic liquid BMIM TFSI. This medium enables controlled polymer growth and enhances electrochromic performance, yielding robust and ...
Carolina Gascó, Sara Santiago, Rosa Maria Sebastián, Gonzalo Guirado   +3 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

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

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

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