Results 1 to 10 of about 703,636 (170)

Seasonal Variations of Polyphenols Content, Sun Protection Factor and Antioxidant Activity of Two Lamiaceae Species

open access: yesPharmaceutics, 2021
Secondary metabolite production by plants is influenced by external environmental factors that can change depending on the seasons, which makes it important to know how the plant, through its metabolism, is able to adapt to these variations.
Juliana de Medeiros Gomes   +4 more
doaj   +1 more source

Ageing characteristics related to cation exchange and interlayer spacing of some Brazilian bentonites

open access: yesHeliyon, 2021
This study investigated the influence of cation type on the sodium deactivation of Brazilian bentonite varieties. Four bentonite clays were studied, including three mixed-cationic and one magnesium.
A.L.V. Carmo, R.S. Angélica, S.P.A. Paz
doaj   +1 more source

ELABORATION OF MANAGEMENT PLAN OF SOLID WASTE FROM SMALL CAST IRON FOUNDRIES [PDF]

open access: yesTecnologia em Metalurgia, Materiais e Mineração, 2013
The foundry industry contributes to society meeting the demand of metal scrap recycling, but, at the same time, it brings a high risk of environmental impact for its many potentially pollutant wastes.
Carlos Alberto Mendes Moraes   +6 more
doaj   +1 more source

Synthesis of N-phenyl- and N-thiazolyl-1H-indazoles by copper-catalyzed intramolecular N-arylation of ortho-chlorinated arylhydrazones

open access: yesBeilstein Journal of Organic Chemistry, 2022
The broad application of 1H-indazoles has prompted the development of several approaches for the synthesis of such compounds, including metal-free, palladium-, or copper-promoted intramolecular N-arylation of in situ-generated or isolated o ...
Yara Cristina Marchioro Barbosa   +6 more
doaj   +1 more source

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

open access: yesMaterials for Renewable and Sustainable Energy, 2020
Nickel nanoparticles supported by commercial carbon paper (CP) are prepared by pulsed laser deposition with deposition time of 3, 6, and 12 min as a catalyst for urea electro-oxidation.
Izabella F. Coelho   +7 more
doaj   +1 more source

CONTRIBUIÇÃO MINERALÓGICA PARA O ESTUDO DE RELEVÂNCIA DE CAVERNAS FERRÍFERAS DA SERRA NORTE, CARAJÁS-PA

open access: yesHolos, 2017
A Província Mineral de Carajás representa uma das maiores províncias minerais do mundo e abriga o maior parque de cavernas em rochas ferríferas do Brasil.Por conta da intensa atividade de extração de minério de ferro em áreas cavernícolas, novas ...
Alan Rodrigo Leal Albuquerque   +3 more
doaj   +1 more source

Thermal and Conduction Properties of a PCL-biodegradable Gel Polymer Electrolyte with LiClO4, LiF3CSO3, and LiBF4 Salts

open access: yesInternational Journal of Electrochemical Science, 2007
A biodegradable gel polymer electrolyte was prepared using Poly(e-caprolactone) as a polymer host and its electrochemical performance was evaluated.
C. Polo Fonseca   +4 more
doaj   +1 more source

Quality of High-protein Diet Bar Plus Chia (Salvia hispanica L.) Grain Evaluated Sensorially by Untrained Tasters [PDF]

open access: yes, 2018
The objective of this study was to develop, analyze composition and evaluate the microbiological and sensory characteristics of high-protein diet bars (PB) with the addition of chia grain (Salvia hispanica L.), partially replacing isolated soy protein ...
Cavenaghi, Daniela Fernanda Lima de Carvalho   +6 more
core   +5 more sources

Phytotoxicity of surface water of the São Paulo Metropolitan Region using bioassay with Sinapis alba

open access: yesActa Brasiliensis, 2018
This research aimed to evaluate the phytotoxicity of surface waters of the São Paulo metropolitan region using bioassays based on Sinapis alba L. (mustard).
Marcio Yukihiro Kohatsu   +5 more
doaj   +1 more source

Physicochemical characteristics of organic honey samples of africanized honeybees from Paraná River islands. [PDF]

open access: yes, 2011
This research was carried out to evaluate the physicochemical composition of organic honey in Paraná River islands, in Porto Brasílio, State of Paraná. Honey was harvested directly from super of the colonies in three apiaries spread in the Floresta and ...
Alves, Eloi Machado   +6 more
core   +3 more sources

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