Consulta: subjectFacets:"Polyethylene"
Registros recuperados: 5
Data/hora: 01/06/2024 18:20:06

HYDROGEN PRODUCTION AND PERFORMANCE OF ANAEROBIC FIXED-BED REACTORS USING THREE SUPPORT ARRANGEMENTS FROM CASSAVA STARCH WASTEWATER
Provedor de dados: 70
Autores: Torres,Douglas G. B.; Lucas,Shaiane Dal' Maso; Andreani,Cristiane L.; Carvalho,Karina Q. de; Coelho,Silvia R. M.; Gomes,Simone D.
ABSTRACT Fixed-bed reactors have been considered promise alternatives for hydrogen production due to their simple construction and increase in the biomass retention. The purpose of this study was to investigate the biological production of hydrogen in anaerobic fixed-bed reactors with cassava starch wastewater used as substrate. Different support materials and arrangements of fixed-bed were used to evaluate the biological production of hydrogen in anaerobic continuous fixed-bed reactors, with cassava starch wastewater as substrate - recycled low-density polyethylene scraps, in packed bed (R1), recycled low-density polyethylene cylinders, in ordained bed (R3) and bamboo stems, in vertical arrangement (R2 and R4). In R1 the initial pH was adjusted for 6.0,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bio-energy; Fermentative processes; Bamboo; Polyethylene; Agro-industrial effluent.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100160

Ingestion and contact with polyethylene microplastics does not cause acute toxicity on marine zooplankton
Provedor de dados: 5
Autores: Beiras, R; Bellas, J.; Cachot, J; Cormier, B.; Cousin, Xavier; Engwall, M.; Gambardella, C.; Garaventa, F.; Keiter, S.; Le Bihanic, F.; Lopez-ibanez, S.; Piazza, V.; Rial, D.; Tato, T.; Vidal-linan, L.
Toxicity of polyethylene microplastics (PE-MP) of size ranges similar to their natural food to zooplanktonic organisms representative of the main taxa present in marine plankton, including rotifers, copepods, bivalves, echinoderms and fish, was evaluated. Early life stages (ELS) were prioritized as testing models in order to maximize sensitivity. Treatments included particles spiked with benzophenone-3 (BP-3), a hydrophobic organic chemical used in cosmetics with direct input in coastal areas. Despite documented ingestion of both virgin and BP-3 spiked microplastics no acute toxicity was found at loads orders of magnitude above environmentally relevant concentrations on any of the invertebrate models. In fish tests some effects, including premature or...
Tipo: Text
Palavras-chave: Polyethylene; Marine litter; Marine zooplankton; Benzophenone-3; Embryo-larval bioassays.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00452/56369/57965.pdf

Tissue-Specific Biomarker Responses in the Blue Mussel Mytilus spp. Exposed to a Mixture of Microplastics at Environmentally Relevant Concentrations
Provedor de dados: 5
Autores: Revel, Messika; Lagarde, Fabienne; Perrein-ettajani, Hanane; Bruneau, Mélanie; Akcha, Farida; Sussarellu, Rossana; Rouxel, Julien; Costil, Katherine; Decottignies, Priscilla; Cognie, Bruno; Châtel, Amélie; Mouneyrac, Catherine.
The impact of a microplastic (MP) mixture composed of polyethylene (PE) and polypropylene (PP) plastic particles, prepared from commercially available products, was evaluated in blue mussels Mytilus spp. exposed to three environmentally relevant concentrations: 0.008 μg L−1 (low), 10 μg L−1 (medium), and 100 μg L−1 (high). Organisms were exposed for 10 days followed by 10 days of depuration in clean seawater under controlled laboratory conditions. The evaluation of MP effects on mussel clearance rate, tissue structure, antioxidant defenses, immune and digestive parameters, and DNA integrity were investigated while the identification of plastic particles in mussel tissues (gills, digestive gland, and remaining tissues), and biodeposits (feces and...
Tipo: Text
Palavras-chave: Microplastics; Polyethylene; Polypropylene; Mytilus; Oxidative stress; Biomarkers.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60089/63427.pdf

Evaluation of the types of starch for preparation of LDPE/starch blends
Provedor de dados: 52
Autores: Vinhas,Glória Maria; Lima,Suzana Moreira de; Santos,Lívia Almeida; Lima,Maria Alice Gomes de Andrade; Almeida,Yêda Medeiros Bastos de.
This study evaluated in relation the growth, and the amylolytic activity of mixed and isolated cultures of Phanerochaete chrysosporium and Talaromyces wortmanni on different types of starch. The thermal and mechanical properties in polyethylene/starch blends (proportion: 80/20 (w/w) before and after inoculation of the mixed cultures were evaluated. The regular starch Amidex 3 and the modified starch Fox5901 stood out in relation to the cellular growth and production of the amylase enzyme. In spite of the short time that the blends were exposed to the fungi, the microorganisms promoted physical and chemical changes in the structure of the blend, modifying its thermal and mechanical properties. The alteration of the degree of crystallinity and mechanical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylolytic enzymes; Polyethylene; Starch; Blends; Talaromyces wortmanii; Phanerochaete crysosporium.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300001

Adhesion and biocides inactivation of Salmonella on stainless steel and polyethylene
Provedor de dados: 58
Autores: Tondo,Eduardo Cesar; Machado,Taís Raquel Marcon; Malheiros,Patrícia da Silva; Padrão,Débora Kruger; Carvalho,Ana Lyl de; Brandelli,Adriano.
The adhesion of Salmonella (S.) strains to stainless steel and polyethylene and their inactivation by biocides used in food industry was investigated. Coupons of stainless steel and polyethylene were immersed in bacterial suspensions of S. Enteritidis, S. Typhimurium, and S. Bredeney during 15, 30, and 60 minutes, and submitted to different concentrations of peracetic acid (PAA), sodium hypochlorite (NaOCl), and quaternary ammonium (Quat) sanitizers. Hydrophobicity of the surfaces was evaluated by contact angle measurements using the sessile drop method and bacterial adhesion was accompanied through bacterial counts and scanning electron microscopy (SEM). Results indicated that the three serovars of Salmonella presented similar adhesion to both materials...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Adhesion; Biocides; Stainless steel; Polyethylene.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000400022