Chemical Alterations
Mostrando 1-12 de 370 artigos, teses e dissertações.
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1. DESENVOLVIMENTO DE ACESSÓRIO PORTÁTIL DE CONTROLE DE TEMPERATURA PARA MEDIDAS ESPECTROSCÓPICAS
Temperature is a natural phenomenon that may modify the structure of chemical compounds and hence their properties. We aimed to develop a simple portable system based on the Peltier principle for spectral characterization of compounds with temperature-dependent structure. The device was constructed and adapted to three pieces of equipment: X-ray diffractomet
Química Nova. Publicado em: 2022
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2. Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave
Abstract The effect of microwave heating on the expansion of vermiculite was studied at a level of 700 W for 4 min exposure time and compared with raw vermiculite. In this study, the characterization of vermiculite from a mine in the northeast region of Brazil was performed using thermogravimetry, N2-adsorption, cation exchange capacity, X-ray powder diffrac
Cerâmica. Publicado em: 2021-06
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3. Traditional sour cassava starch obtained with alterations in the solar drying stage
Abstract After natural fermentation and solar drying, sour cassava starch acquires expansion property. Traditionally, solar drying occurs without protection, and consequently physical contamination can arise. Thus, the aim of this study was to produce sour cassava starch using a low-cost solar dryer to prevent contamination, whilst retaining the expansion pr
Food Sci. Technol. Publicado em: 2021-06
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4. Evaluation of autolysis induced histologic alterations in skeletal muscle tissue of non-traditional meat animals
Abstract Raw meat is characterized by various natural cellular processes that lead to its chemical content alteration. The purpose of the present study is to evaluate autolysis induced histologic alterations in skeletal muscle tissue of cow elk. In this study the authors used skeletal muscle tissue of 2-year-old cow elk. The tissue was sampled from m. quadri
Food Sci. Technol. Publicado em: 2020-09
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5. BEHAVIOR OF THERMALLY MODIFIED WOOD TO BIODETERIORATION BY XYLOPHAGE FUNGI
ABSTRACT Thermally modified wood undergoes chemical, physical, and mechanical modifications, resulting in changes in resistance to wood biodegrading agents. The objective of this study was to evaluate the resistance to biodeterioration of thermally modified wood by the industrial process VAP HolzSysteme® of Eucalyptus grandis, Pinus taeda and Tectona grandi
CERNE. Publicado em: 2020-09
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6. Evaluation of autolysis induced histologic alterations in skeletal muscle tissue of non-traditional meat animals
Abstract Raw meat is characterized by various natural cellular processes that lead to its chemical content alteration. The purpose of the present study is to evaluate autolysis induced histologic alterations in skeletal muscle tissue of cow elk. In this study the authors used skeletal muscle tissue of 2-year-old cow elk. The tissue was sampled from m. quadri
Food Sci. Technol. Publicado em: 20/12/2019
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7. Hematological and biochemical parameters in Spotted Paca (Cuniculus paca) undergoing pharmacological restraint and general anesthesia
RESUMO O objetivo do presente estudo foi avaliar os efeitos de contenção química, anestesia geral e tratamento com opiáceos nos parâmetros hematológicos em Cuniculus paca. Foram avaliados oito animais saudáveis, fêmeas, adultas, de cativeiro, que foram submetidas a três procedimentos laparoscópicos, com intervalo de 15 dias. Após a contenção fí
Arq. Bras. Med. Vet. Zootec.. Publicado em: 28/10/2019
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8. Physiological and toxic effects of selenium on seed germination of cowpea seedlings
ABSTRACT Selenium (Se) is considered a beneficial chemical element for plants, but in high concentrations it may present symptoms of toxicity. The present study aimed to evaluate 11 concentrations of Se (0; 0.1; 0.5; 1; 5; 10; 20; 40; 80; 400; 800 mg.L-1) to determine the low and high (toxicity) critical levels to seed germination of cowpea (Vigna unguiculat
Bragantia. Publicado em: 10/10/2019
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9. Luminosity levels and substrates composition on Bermuda Grass development
Resumo Gramado é parte fundamental na composição de campos esportivos. Alguns aspectos devem ser levados em consideração no processo de escolha da espécie a ser utilizada, como a utilização do gramado (tolerância ao pisoteio), manejo do gramado, condições físico-químicas do solo e tolerância ao sombreamento. Com a realização de eventos esport
Ornam. Hortic.. Publicado em: 12/08/2019
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10. Occupational exposure to pesticides and hematological alterations: A survey of farm residents in the South of Brazil
Resumo O objetivo deste estudo foi investigar a associação entre a exposição a organoclorados (OC) e agrotóxicos não persistentes e os parâmetros hematológicos em uma população agrícola de Farroupilha-RS. Foi utilizado um questionário para coletar informações sobre fatores sociodemográficos e de estilo de vida, duração, frequência e tipo de
Ciênc. saúde coletiva. Publicado em: 27/06/2019
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11. Propriedades de adesivo aplicado em painéis a partir da substituição por lignossulfonato do processo sulfito
Resumo Considerando a indústria de painéis aglomerados, a maior parte utiliza adesivos sintéticos, especialmente, à base de ureia-formaldeído, e nesse sentido, estudos que englobam as características de materiais alternativas para a indústria de painéis tornam-se importantes, especialmente quando se considera o custo final dos produtos gerados. O pre
Ciênc. Florest.. Publicado em: 30/05/2019
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12. Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues
ABSTRACT Vermicomposted vegetal and animal residues are rich in nutrients and humic substances and thus can be applied to the soil as a source of functionalized organic matter (OM) and as an alternative to chemical fertilizers. In Southern Brazil, many animal and vegetal residues are easily accessible. Therefore, this study aimed to evaluate alterations in s
Rev. Bras. Ciênc. Solo. Publicado em: 16/05/2019