Eco Toxicity
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Eco-Friendly Luminescent Hybrid Materials Based on EuIII and LiI Co-Doped Chitosan
Biopolymer-based materials have been of particular interest as alternatives to synthetic polymers due to their low toxicity, biodegradability and biocompatibility. Among them, chitosan is one of the most studied ones and has recently been investigated for the application as solid state polymer electrolytes. Furthermore, it can serve as a host for luminescent
J. Braz. Chem. Soc.. Publicado em: 2015-12
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2. Green Synthesis of AgNPs Stabilized with biowaste and their antimicrobial activities
In the present study, rapid reduction and stabilization of Ag+ ions with different NaOH molar concentration (0.5 mM, 1.0 mM and 1.5 mM) has been carried out in the aqueous solution of silver nitrate by the bio waste peel extract of P.granatum. Generally, chemical methods used for the synthesis of AgNPs are quite toxic, flammable and have adverse effect in me
Braz. J. Microbiol.. Publicado em: 2014-12
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3. Green Propellants: Oxidizers
ABSTRACT: The research for low toxicity and no damage to the environment has stimulated the development of specific investigation lines in many areas. Inevitably, the criteria for safe handling, sensitivity and, above all, specific impulse (efficiencies) of propellant compositions are still superior in relation to ecological appeals. Nowadays, however, the s
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
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4. Eco/genotoxicidade do corante comercial CI Disperse Red 1 e seus subprodutos clorados / Eco/genotoxicity of commercial dye CI Disperse Red 1 and chlorinated by-products
Cerca de 70% dos corantes utilizados em indústrias têxteis são corantes do tipo azo, que se caracterizam pelo grupo -N=N- ligado a sistemas aromáticos, sendo que a função azo inclui os principais tipos de corantes. A eliminação da cor no efluente é um grande desafio para o setor têxtil, já que, aproximadamente, 15% da produção mundial de corante
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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5. Avaliação a campo de uma estirpe de Bacillus thuringiensis tóxica à lepidoptera e seu possível efeito adverso sobre espécies não-alvo
The using of the Bacillus thuringiensis on the cabbage culture for the control of the diamondback moth has been an alternative commonly used by the producers to substitute the traditional chemical insecticides that cause damages to the environment and to the human health, as opposed to the biological products that are harmless to the humans so as to the non-
Publicado em: 2008
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6. Avaliação ecotoxicológica de efluentes de celulose branqueada de eucalipto ao longo do tratamento biológico / Ecotoxicology assessment of bleached eucalipt pulp mill efluents in the biological treatment
O presente estudo teve como objetivo avaliar a toxicidade de efluentes de celulose branqueada de eucalipto. Inicialmente foi feita uma caracterização físicoquímica das amostras, em diferentes pontos ao longo do tratamento, e posteriormente para estes mesmos pontos foi avaliada a toxicidade com quatro organismos-teste: para toxicidade aguda: a) Vibrio fis
Publicado em: 2008
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7. Critérios para avaliação da qualidade de sedimentos - Estudo de caso: Sub-bacia do Ribeirão Espírito Santo, afluente do Rio São Francisco / Criteria for evaluating sediment quality - Case Study: Sub-Watershed of Espírito Santo Stream; Affluent of the São Francisco River
Sediment Quality Values Guidelines (SQVG) have been used for evaluating ecological risk associated with the sediment contamination for benthonic organisms. The main objective of this work was to develop methodologies and to collect data that allowed the application of SQVG for the following metals: Cd, Cu, Pb, Ni and Zn. The location chosen for the case stud
Publicado em: 2007
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8. Análise de ecoeficiência: avaliação do desempenho econômico-ambiental do biodiesel e petrodiesel. / Eco-efficiency analysis: environmental-economic assessment of biodiesel and petrodiesel.
Biodiesel is the most likely alternative to petrodiesel. It is composed of methyl or ethyl esters from fatty acids, obtained by a transesterification reaction between any triglycerides and an alcohol with short chain, methanol or ethanol. It has almost the same properties of petrodiesel, but comparing with this, it can eliminate the sulfur oxides emissions a
Publicado em: 2006
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9. Cloning and characterization of the mvrC gene of Escherichia coli K-12 which confers resistance against methyl viologen toxicity.
A new gene mvrC conferring resistance to methyl viologen, a powerful superoxide radical propagator, was cloned on 13.5 kilo base (kb) EcoRI DNA fragment. It gave resistance against methyl viologen to even a wild-type strain with gene dosage dependence. From the physical maps obtained by restriction enzyme digestions, it was predicted to locate at 580 kbp (12
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10. Cloning and expression of the transposable chlorobenzoate-3,4-dioxygenase genes of Alcaligenes sp. strain BR60.
Growth on 3-chlorobenzoate was found to induce the enzymes of the protocatechuate meta ring fission pathway in Alcaligenes sp. strain BR60. The chlorobenzoate catabolic genes, designated cba, were localized to a 3.7-kb NotI-EcoRI fragment within the nonrepeated region of the composite transposon Tn5271. The cba genes were cloned onto two broad-host-range vec
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11. Characterization of a region of the IncHI2 plasmid R478 which protects Escherichia coli from toxic effects specified by components of the tellurite, phage, and colicin resistance cluster.
The IncHI2 plasmid R478 specifies resistance to potassium tellurite (Te(r)), to some bacteriophages (Phi), and to pore-forming colicins (PacB). The genes encoding the three phenotypes are linked, and an 8.4-kb fragment of R478 DNA encoding them cannot be subcloned unless cocloned with a second section of the plasmid. Subclone pKFW4A contains a 5.9-kb BamHI-E
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12. Molecular cloning and characterization of the insecticidal crystal protein gene of Bacillus thuringiensis var. tenebrionis
The insecticidal crystal protein gene of the coleopteran-toxic Bacillus thuringiensis var. tenebrionis has been isolated, and the nucleotide sequence has been determined. A total DNA library from var. tenebrionis was made in the plasmid vector pUC12. By using a synthetic 27-base oligonucleotide corresponding to a stretch of nine N-terminal amino acids of a t