Ca Oh 2
Mostrando 37-48 de 384 artigos, teses e dissertações.
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37. ESTUDO QUÍMICO DE EFLORESCÊNCIAS SALINAS DO SÍTIO ARQUEOLÓGICO TOCA EXÚ DO JURUBEBA DO PARQUE NACIONAL SERRA DA CAPIVARA, PIAUÍ, BRASIL
Toca Exú do Jurubeba is part of a set of archaeological sites located in the Serra da Capivara National Park (Piauí, Brazil), a region of great world interest due to its archaeological potential, especially rock art. However, rock art is constantly threatened by both natural and anthropic factors. Among the natural salts efflorescences that are deposited o
Quím. Nova. Publicado em: 2017-09
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38. BIOPRODUCTION AND CHARACTERIZATION OF SODIUM, POTASSIUM, AND CALCIUM LACTOBIONATES
Lactobionic acid and its salts are substances that have several applications in the pharmaceutical area. These products were obtained by bioconversion through the enzymatic complex glucose-fructose-oxidoreductase (GFOR)/gluconolactonase (GL) present in calcium alginate immobilized cells of Zymomonas mobilis. In the reactions catalyzed by this enzyme system,
Quím. Nova. Publicado em: 2017-09
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39. Calcium hydroxide associated with a new vehicle: Psidium cattleianum leaf extracts. Tissue response evaluation
Abstract The aim of this study was to evaluate edemogenic activity and subcutaneous inflammatory reaction induced by Psidium cattleianum leaf extracts associated with Ca(OH)2. Thirty male Wistar rats, split equally into three groups [aqueous extract + Ca(OH)2; ethanolic extract + Ca(OH)2; and propylene glycol + Ca(OH)2], were assessed every 3 h or 6 h (five
Braz. oral res.. Publicado em: 03/07/2017
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40. Electroflotation of precipitated phosphate from synthetic solution
ABSTRACT The phosphate recovery from a 20 mg L-1 Na2HPO4 solution through precipitation with Ca(OH)2 followed by electroflotation was evaluated. X-ray diffraction and particle size measurements indicated that the precipitates were a mixture of hydroxyapatite and calcium-deficient hydroxyapatite, with size ranging from 3 to 10 μm. Electroflotation with Na-ol
Braz. J. Chem. Eng.. Publicado em: 2017-07
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41. Studies of the Colloidal Properties of Superparamagnetic Iron Oxide Nanoparticles Functionalized with Platinum Complexes in Aqueous and PBS Buffer Media
This work has focused on the synthesis of three nanosystems composed of superparamagnetic iron oxide nanoparticles (SPIONs) coated either with a carboxylate platinum(IV) complex (PD = cis,cis,trans-[Pt(NH3)2Cl2(HOOCCH2CH2COO)(OH)]) or with platinum(II) complex functionalized dextrans (DexPt1 = [Pt(Dex-NH2)Cl3] and DexPt2 = [Pt(Dex-NH2)(NH3)2(H2O)]). All nano
J. Braz. Chem. Soc.. Publicado em: 2017-05
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42. A new cement slurry modified with chitosan/alginate interpenetrating networks and hydroxyapatite - structural characteristics after long-term contact with hyper-saline produced water from oil well operations
ABSTRACT Oil is an important source of energy, mainly in developing countries. Important research has been conducted to find cementing procedures that guarantee safe and cost-effective oil exploration below pre-salt layers. This work aimed to make a new cement paste with cement, seawater, silica, biopolymers (chitosan and sodium alginate) and hydroxyapatite
Matéria (Rio J.). Publicado em: 10/04/2017
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43. Avaliação dos efeitos de diferentes dosagens de água/cal na resistência à compressão axial de compósitos de madeira-cimento
RESUMO Diversos estudos mostram que algumas espécies de madeira não estão aptas à produção de compósitos madeira-cimento. Isso ocorre porque os componentes orgânicos podem afetar tanto a interação entre a madeira e o cimento, quanto as interações internas do cimento. Com isso, pesquisadores vêm estudando alternativas de pré-tratamento do materi
Matéria (Rio J.). Publicado em: 06/04/2017
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44. Removal of calcium hydroxide from Weine Type II systems using photon-induced photoacoustic streaming, passive ultrasonic, and needle irrigation: a microcomputed tomography study
ABSTRACT Objective This study compared the effectiveness of Er:YAG laser-activated irrigation (PIPS), passive ultrasonic irrigation (PUI) with EndoUltra and standard needle irrigation (SNI) in the removal of calcium hydroxide [Ca(OH)2] from the mesial roots of Weine Type II mandibular molars. Material and Methods Thirty mandibular molars were screened by
J. Appl. Oral Sci.. Publicado em: 2016-12
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45. Immunohistochemical Expression of TGF-β1 and Osteonectin in engineered and Ca(OH)2-repaired human pulp tissues
Abstract The aim of the present study was to evaluate the expression of transforming growth factor-β1 (TGF-β1) and osteonectin (ON) in pulp-like tissues developed by tissue engineering and to compare it with the expression of these proteins in pulps treated with Ca(OH)2 therapy. Tooth slices were obtained from non-carious human third molars under sterile p
Braz. oral res.. Publicado em: 10/10/2016
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46. Eficiência de extratores na solubilização de fontes alternativas de potássio
RESUMO. O conhecimento da mineralogia de rochas permite conclusões sobre propriedades que vão desde suas características físicas até a facilidade de solubilização. O objetivo do presente estudo foi avaliar o uso de diferentes extratores na solubilização do potássio (K) presente em rochas potenciais fontes de nutrientes e os efeitos do tempo de cont
Acta Sci., Agron.. Publicado em: 2016-09
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47. Recent mineral discoveries in the Coronel Murta, Taquaral, and Medina pegmatite fields, northeastern Minas Gerais, Brazil
Abstract The occurrence of five rare minerals in the Eastern Brazilian Pegmatite Province, northeastern Minas Gerais, is described and discussed: bergslagite [CaBe(AsO4)(OH)] from the Manoel Fonseca mine, Coronel Murta county; herderite [CaBe(PO4)F] from the Funil mine, Medina county; lithiophosphate [Li3PO4] from the Cachoeira mine, Araçuaí/Itinga countie
REM, Int. Eng. J.. Publicado em: 2016-09
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48. Kinetic Analysis of the Decomposition of the KFe3(SO4)2-x(CrO4)x(OH)6 Jarosite Solid Solution in Ca(OH)2 Medium
The decomposition of the solid solution of potassium jarosite with chromium(VI) in Ca(OH)2 media was studied in the present work. According to experimental results, the incorporation of CrO42- into the crystal structure of jarosite resulted in a solid solution with the following approximate formula: [K0.86(H3O)0.14]Fe2.67[(SO4)1.23(CrO4)0.77][(OH)5.01(H2O)0.
J. Braz. Chem. Soc.. Publicado em: 2016-06