Results 181 to 190 of about 726,750 (290)

O reino da impura sorte: mulheres e homens, garimpeiros em Minas Gerais / [PDF]

, 2001
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas.Esta pesquisa tem como ponto focal a análise das relações de gênero na comunidade garimpeira de Datas, localizada no Estado de Minas Gerais.
Santos, Bernadette Grossi dos
core  

Design and optoelectronic profiling of a semicrystalline thiophene–phenylene copolymer for advanced organic electronics

Polymer International, EarlyView.
A new semicrystalline copolymer, PTBT‐3OBu, was synthesized. Intramolecular S···O conformational locks induce high backbone planarity, promoting strong interchain coupling and molecular ordering in thin films, seen in an optical red shift. This synergy between planarity and semicrystalline morphology is promising for photovoltaic and electrochromic ...
Sandra Lúcia Nogueira, Silésia de Fátima Curcino da Silva, Giovani Bortolini Oliveira, Bruno Souza Zanatta, Thibaut Jarrosson, Françoise Serein‐Spirau, Alexandre Marletta, Raigna Augusta da Silva   +7 more
wiley   +1 more source

Leucaena Oil Functionalized With Osmium Tetroxide as a Precursor for Polyol‐Based Polyurethane

Journal of Polymer Science, EarlyView.
Leucaena leucocephala seed oil is converted into a hydroxyl‐functional biopolyol through OsO4‐mediated dihydroxylation. The resulting biopolyol shows a hydroxyl number of 160–175 mg KOH g−1 and is successfully used to produce flexible, open‐cell polyurethane foams, highlighting a renewable route for converting underutilized biomass into value‐added ...
Giovanni Miraveti Carriello, Lucas Repecka Alves, Guilherme Manassés Pegoraro, Henrique Solowej Medeiros Lopes, Amanda Stefanie Jabur de Assis, Thaís de Agrella Janolla, David Rodrigues Gomes, Diego Aleixo da Silva, Beatriz Merillas, Fabiana Aparecida Lobo, Fabio Minoru Yamaji, Maira de Lourdes Rezende, Aparecido Junior de Menezes, Giovanni Pimenta Mambrini   +13 more
wiley   +1 more source

Trabalho, progresso e a sociedade civilizada. As práticas médicas e as figurações do sertão mineiro na Primeira República

Fronteiras, 2011
O propósito deste artigo é compreender, através dos discursos e práticas médico-higienistas, as articulações entre os projetos de modernização que estiveram em curso no Brasil do final do século XIX, as representações acerca dos espaços interioranos do ...
Florisvaldo Paulo Ribeiro Júnior
doaj  

The most threatened plants receive the least scientific attention

PLANTS, PEOPLE, PLANET, EarlyView.
Plants sustain all life, providing the energetic and structural basis of ecosystems, but they face a growing risk of extinction. Reversing this decline requires an understanding of how scientific knowledge is distributed among species, and identification of the biases and gaps that hinder effective responses to the threats they face. However, we reveal
Renon S. Andrade, Matilda J. M. Brown, Leandro Freitas, Eimear M. Nic Lughadha   +3 more
wiley   +1 more source

Beyond forests: Harnessing conservation gardening for open biomes in Brazil

PLANTS, PEOPLE, PLANET, EarlyView.
Urban gardening offers an innovative conservation strategy by integrating native ornamental species into urban landscapes. We evaluated the ornamental potential of the Brazilian flora by comparing the representation of species from forests versus open biomes (focusing on campo rupestre grasslands) and introduced and validated the Index of Ornamental ...
Flávia Santos Faria, Luciane Vilela Resende, Fernando A. O. Silveira   +2 more
wiley   +1 more source

Novel tetronamides derived from mucobromic acid: synthesis, structural elucidation, DFT calculations and phytotoxic activity

Pest Management Science, EarlyView.
The acyclic mucobromic acid, activated by (1S)‐(+)‐10‐camphorsulfonic acid, afforded the chiral compound 1b, precursor for aza‐Michael addition/elimination on the butenolide yielding tetronamides 2b‐7b. Their relative SRSR configuration was confirmed by the spectrometric methods, DFT calculation and statistical methods.
Kamylla CF Faria, Vitor C Baia, Elson S Alvarenga   +2 more
wiley   +1 more source

Host‐induced silencing of the Minc09294 effector gene impairs Meloidogyne incognita and M. Enterolobii infection

Pest Management Science, EarlyView.
Host‐induced gene silencing of the effector candidate Minc09294 significantly impairs Meloidogyne incognita parasitism, markedly reducing gall formation, reproduction, and the development of specialized giant cells, with partial cross‐species effects on M.
João Pedro Abreu‐Sousa, Thuanne Pires Ribeiro, Daniele Heloisa Pinheiro, Valdeir Junio Vaz Moreira, Luanna Pinheiro Alburquerque Freitas Bezerra, Júlia Moura Rosário Santana, Lays Antunes Teixeira, Maria Eugenia Lisei‐de‐Sa, Deyse Alexandra Rosero Alpala, Manoely Abreu Reis, Isabela Tristan Lourenço‐Tessutti, Leonardo Lima Pepino Macedo, Carolina Vianna Morgante, Maria Cristina Mattar Silva, Marcos Fernando Basso, Janice de Almeida‐Engler, Maria Fatima Grossi‐de‐Sa   +16 more
wiley   +1 more source

Absorption and translocation of 14C‐propiconazole associated with two adjuvants in young coffee plants

Pest Management Science, EarlyView.
Experimental workflow evaluating 14C‐propiconazole absorption and translocation in Coffea arabica with two biodegradable adjuvants, quantified at six post‐application time points using radioscanner and liquid scintillation spectrometry. Abstract BACKGROUND This study evaluated the absorption, translocation and distribution of 14C‐propiconazole applied ...
Valéria de Souza Ivo, Emerson Leite, José Mak, Valdemar Luiz Tornisielo, Kassio Ferreira Mendes   +4 more
wiley   +1 more source

Brown–Proschan Repair Policy for Repairable Systems Using the Discrete Weibull Failure Distribution and Markov Chains

Quality and Reliability Engineering International, EarlyView.
ABSTRACT A repairable system operates under a maintenance strategy involving scheduled preventive maintenance (PM) and corrective repair actions following failures. This study develops an exact analytical methodology using Markov chains with discrete states and time to calculate the expected number of failures E[N(t)]$\mathop {\mathbb {E}}[N(t)]$ under
Danilo G. O. Valadares, Roberto C. Quinino, Linda L. Ho, Frederico R. B. Cruz   +3 more
wiley   +1 more source