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Registros recuperados: 7
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Characterization of granite and limestone powders for use as fillers in bituminous mastics dosage Anais da ABC (AABC)
BARRA,BRENO; MOMM,LETO; GUERRERO,YADER; BERNUCCI,LIEDI.
This paper discusses the importance of studies on materials known as fillers from different mineral origins, used in asphalt mixes, specifically in the formulation of mastics. The research was carried out on samples of limestone and granite rock filler and asphalt binder (50/70). The samples were evaluated through semiquantitative chemical analyses by X-ray fluorescence, granulometry by low angle laser emission, scanning electron microscopy, softening point tests, penetration tests, and aggregate-asphalt binder and aggregate-mastic adhesion tests. The results highlighted convergent trends, indicating that the active behavior of the fillers in the mastic formulation is not related to the size of the particles, but rather to their form, surface texture,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characterization; Fillers; Granite; Limestone; Bituminous mastics.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200995
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Contamination in mafic mineral-rich calc-alkaline granites: a geochemical and Sr-Nd isotope study of the Neoproterozoic Piedade Granite, SE Brazil Anais da ABC (AABC)
Leite,Renato J.; Janasi,Valdecir A.; Martins,Lucelene.
The Piedade Granite (~600 Ma) was emplaced shortly after the main phase of granite magmatism in the Agudos Grandes batholith, Apiaí-Guaxupé Terrane, SE Brazil. Its main units are: mafic mineral-rich porphyritic granites forming the border (peraluminous muscovite-biotite granodiorite-monzogranite MBmg unit) and core (metaluminous titanite-bearing biotite monzogranite BmgT unit) and felsic pink inequigranular granite (Bmg unit) between them. Bmg has high LaN/YbN (up to 100), Th/U (>10) and low Rb, Nb and Ta, and can be a crustal melt derived from deep-seated sources with residual garnet and biotite. The core BmgT unit derived from oxidized magmas with high Mg# (~45), Ba and Sr, fractionated REE patterns (LaN/YbN= 45), 87Sr/86Sr(t)~ 0.710, epsilonNd(t) ~...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Granite; Calc-alkaline; Peraluminous; Magma contamination; Sr-Nd isotope geochemistry.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200013
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Development and characterization of microsatellite markers for Tibouchina hatschbachii (Melastomataceae), an endemic and habitat-restricted shrub from Brazil Biological Sciences
Maia, Fabiano Rodrigo; Sujii, Patricia Sanae; Goldenberg, Renato; Pereira, Viviane Silva; Zucchi, Maria Imaculada.
Tibouchina hatschbachii Wurdack (Melastomataceae) is an autogamous shrub restricted to granite (GO) and sandstone (SO) rock outcrops from subtropical Brazil. We designed primers for the amplification of microsatellite regions for T. hatschbachii, and characterized these primers to estimate genetic diversity parameters and contemporary genetic structure patterns. Eight loci were successfully amplified and were characterized using 70 individuals from three natural populations. Polymorphic information content ranged from 0.200 to 0.772 per locus. All loci were polymorphic, with allele numbers ranging from two to eight. The low degree of polymorphism may be explained by the fact that T. hatschbachii has disjunct populations and a recent genetic bottleneck, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genética Melastomataceae; Tibouchina; Granite; Sandstone; Rock outcrops; Population genetics; Simple sequence repeat (SSR) Marcadores microssatélites.
Ano: 2016 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31496
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Production of Antimicrobial Metabolites by Streptomyces lavendulocolor VHB-9 Isolated from Granite Mines BABT
B.S.S.N,Hima Bindu; Muvva,Vijayalakshmi; Munaganti,Rajesh Kumar; Naragani,Krishna; Konda,Saidulu; Dorigondla,Kumar Reddy.
ABSTRACT The actinobacterial strain Streptomyces lavendulocolor VHB-9 was isolated from granite mine soil samples of Khammam district, Telangana state, India. The strain was identified based on detailed microorphological, cultural and phylogenetic analysis. Bioactive guided isolation of the secondary metabolites of the strain was carried out by growing the strain in optimized medium (0.5% lactose, 0.5% peptone, 0.05% K2HPO4, 0.2% CaCO3 with pH adjusted to 7.0). Separation and purification of the active fractions from the crude ethyl acetate extract was carried out by silica gel column chromatography and resulted in the isolation of two active fractions. Structural elucidation of the two (B2 and B3) active compounds was carried out by FT-IR, Mass and NMR...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Granite; Streptomyces lavendulocolor; Spectroscopy; Bis (7-methyloctyl) phthalate; (Z)-3-aminoacrylic acid..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100413
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Surface modification of a granite building stone in central Rio de Janeiro Anais da ABC (AABC)
Baptista-Neto,José A.; Smith,Bernard J.; McAllister,John J.; Silva,Maria Augusta M.; Castanheira,Fabio S..
In order to evaluate environmental controls on the soiling formation and decay of building stones a set of mapping and physical and chemical analyses were carried out on granite from a historical church in the polluted centre of Rio de Janeiro. These techniques highlight the increasing of threatening damage on generally perceived as a durable building material, caused by granular disaggregation and contour scaling in areas close to ground level. Mapping also indicated the formation of black crusts over entire building façades, concentrated on areas sheltered from rain-wash. Analyses demonstrated the influence of marine aerosols, rock and mortar composition and mostly of the atmospheric pollutants on the decay and soiling of the granite. Much of the decay...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Weathering; Granite; Air pollution; Marine aerosols; Gypsum crusts.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200011
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The adherence of Pseudomonas fluorescens to marble, granite, synthetic polymers, and stainless steel Ciênc. Tecnol. Aliment.
Careli,Roberta Torres; Andrade,Nelio José; Soares,Nilda Fatima; Ribeiro Júnior,José Ivo; Rosado,Marcilía Santos; Bernardes,Patrícia Campos.
The adherence of Pseudomonas fluorescens cells to nine food-processing contact surfaces was evaluated using the plate-count method. The surfaces include marble, granite, stainless steel, polyvinyl chloride, polyurethane, and silicone-coated cloth, which have been used only in a few studies concerning bacterial adherence. The number of cells adhered to the surfaces increased with contact time reaching 5.0-6.1 log CDM.cm-2 after 10 hours, which can be considered a well established adherence process. The number of adhered cells doubled in 29.5 minutes and 23.5 minutes on stainless steel and thin polyvinyl chloride-coated cloth, respectively. For the other surfaces, this value was 9.8 minutes on average. Marble, granite, thick polyvinyl-coated cloth,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterial adherence; Pseudomonas fluorescens; Marble; Granite; Synthetic polymers; Stainless steel.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612009000100026
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The Ilha Anchieta Quartz Monzonite: the southernmost expression of ca. 500 Ma post-collisional magmatism in the Ribeira Belt Anais da ABC (AABC)
Sobrinho,José M. Azevedo; Janas,Valdecir A.; Simonetti,Antonio; Heaman,Larry M.; santoro,Jair; Diniz,Hélio N..
The Ilha Anchieta Quartz Monzonite (IAQM) occupies most of the homonymous island in the coast of the state of São Paulo, and is intrusive into foliated rocks of the ~565 Ma Ubatuba Charnockite. The main petrographic variety is a porphyritic biotite-hornblende quartz monzonite with 2-4 cm tabular microcline megacrysts set in a medium-grained groundmass and magmatic foliation. Outcrop-scale structures indicate cumulative processes (modal and grain-size magmatic banding) and interaction with basic magmas (mafic microgranular enclaves). Lithogeochemical data indicates that the main variety is intermediate to acid (S1O2 = 63-67%), alkali-calcic, metaluminous and magnesian (mg# ~30), showing moderate Sr (300-400 ppm) and Ba (~1500 ppm) contents and relatively...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Granite; Lithogeochemistry; LA-ICPMS; Zircon U-Pb dating; Ribeira Belt.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300010
Registros recuperados: 7
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