Divalent Cations
Mostrando 1-12 de 907 artigos, teses e dissertações.
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1. A HIGHLY SELECTIVE FLUORESCENT SENSOR FOR DETECTION OF TRIVALENT METAL IONS BASED ON A SIMPLE SCHIFF-BASE
A simple and easily synthesized fluorescent sensor L, based on condensation reaction of 1-Naphthylamine and terephthalaldehyde, was synthesized and characterized systemically. Both UV-vis and fluorescence spectroscopic studies indicated that the sensor L showed good selectivity toward trivalent metal ions (such as Al3+, Fe3+, Cr3+, La3+ and Ce3+) over other
Quím. Nova. Publicado em: 2018-06
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2. Cytolytic and systemic toxic effects induced by the aqueous extract of the fire coral Millepora alcicornis collected in the Mexican Caribbean and detection of two types of cytolisins
AbstractBackground Millepora alcicornis is a branching hydrocoral common throughout the Caribbean Sea. Like other members of this genus, this species is capable of inducing skin eruptions and blisters with severe pain after contact. In the present study, we investigated the toxicity of theM. alcicornis aqueous extract on several animal models. Considering th
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/10/2015
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3. An oxidant and organic solvent tolerant alkaline lipase by P. aeruginosa mutant: downstream processing and biochemical characterization
An extracellular alkaline lipase from Pseudomonas aeruginosa mutant has been purified to homogeneity using acetone precipitation followed by anion exchange and gel filtration chromatography and resulted in 27-fold purification with 19.6% final recovery. SDS-PAGE study suggested that the purified lipase has an apparent molecular mass of 67 kDa. The optimum te
Braz. J. Microbiol.. Publicado em: 2013-12
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4. Characteristics of hemolytic activity induced by skin secretions of the frog Kaloula pulchra hainana
Background The hemolytic activity of skin secretions obtained by stimulating the frog Kaloula pulchra hainana with diethyl ether was tested using human, cattle, rabbit, and chicken erythrocytes. The skin secretions had a significant concentration-dependent hemolytic effect on erythrocytes. The hemolytic activity of the skin secretions was studied in the pre
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 18/04/2013
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5. Some factors affecting tannase production by Aspergillus niger Van Tieghem
One variable at a time procedure was used to evaluate the effect of qualitative variables on the production of tannase from Aspergillus niger Van Tieghem. These variables including: fermentation technique, agitation condition, tannins source, adding carbohydrates incorporation with tannic acid, nitrogen source type and divalent cations. Submerged fermentatio
Braz. J. Microbiol.. Publicado em: 2013
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6. Resíduo da colheita de eucalipto e fontes de cálcio na agregação do solo e na estabilização da matéria orgânica / Crop residue of eucalyptus and calcium sources on soil aggregation and stabilization of organic matter
The interaction of organic compounds with divalent cations such as calcium (Ca) may improve soil aggregation and polymerise the organic molecules, forming metal-organic complexes more stable. The effectiveness of Ca on the aggregation in forest soils, in field conditions, and the influence of different sources of Ca in decomposing residues of eucalyptus and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2010
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7. Ectonucleotidase activities in Sertoli cells from immature rats
Sertoli cells have been shown to be targets for extracellular purines such as ATP and adenosine. These purines evoke responses in Sertoli cells through two subtypes of purinoreceptors, P2Y2 and PA1. The signals to purinoreceptors are usually terminated by the action of ectonucleotidases. To demonstrate these enzymatic activities, we cultured rat Sertoli cell
Publicado em: 2010
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8. Synthesis, characterization and application adsorptive of a new sililante agent immobilized on silica gel by different routes. / Síntese, caracterização e aplicação adsortiva de um novo agente sililante imobilizado na sílica gel por rotas distintas
The reaction between 3-aminopropyltriethoxysilane (AMPTS) with thioglycolic acid (TGA) resulted in a new sililante agent, AMPTGA. This matrix has nitrogen, oxygen and sulfur as basic centers, that have ability to adsorb metallic cations in solution. Immobilization of AMPTGA onto silica gel surface was developed by using conventional heterogeneous method, usi
Publicado em: 2009
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9. Preliminary characterization of a Rhodnius prolixus hemolymph trypanolytic protein, this being a determinant of Trypanosoma rangeli KP1(+) and KP1(-) subpopulations' vectorial ability
Rhodnius prolixus is the main Trypanosoma rangeli vector in several Latin-American countries and is susceptible to infection with KP1(+) strains; however, it presents an invasion-resistant response to KP1(-) strains. The present work has identified a trypanolytic protein against T. rangeli KP1(-) in the R. prolixus hemolymph which was fractioned with ammoniu
Memórias do Instituto Oswaldo Cruz. Publicado em: 2008-03
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10. Estudo da adsorção de água em compostos tipo-brucita por cálculos ab initio
The anionic clays, also known as layered double hydroxides (LDH) or hydrotalcitelike compounds, constitute a family of materials whose chemical formula can be represented by: [M2+ (1x) Me3+ x(OH)2]x+ . Amx/ m .nH2O. These compounds have hydroxide planes, or layers, which become permanently positively charged by the substitution of divalent cations M2+ by tri
Publicado em: 2008
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11. Estudo de soluções sólidas binárias de sais iônicos duplos de metais bivalentes através da espectroscopia de vida média do pósitron (EVMP) e da espectroscopia de alargamento da raia de aniquilação por efeito Doppler (EARAD)
Studies applying Positron Anihilation Lifetime Spectroscopy (PALS) in solids provide evidence of the importance of physical and chemical properties of the central ion and the importance of the ligand in positronium formation. PALS has been used as a potentially important technique for differentiation and study of systems constituted by solids or by mixtures
Publicado em: 2008
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12. Efeito da adubação com fósforo e potássio na toxidez de ferro em arroz irrigado / Effect of phosphorus and potassium adubation on the iron toxicity in irrigated rice.
The iron toxicity may cause considerable reduction in rice productivity, depending on the intensity of symptoms and on the affected farming area. It is necessary to identify the factors that determine the occurrence of this nutritional disorder, as well as, the possible involvement of other nutrients, such as phosphorus and potassium, in its intensity. The o
Publicado em: 2007