Consulta: subjectFacets:"XRD"
Registros recuperados: 7
Data/hora: 13/06/2024 05:06:06

The use of chitosan in protecting wooden artifacts from damage by mold fungi
Provedor de dados: 69
Autores: El-Gamal,Rehab; Nikolaivits,Efstratios; Zervakis,Georgios I; Abdel-Maksoud,Gomaa; Topakas,Evangelos; Christakopoulos,Paul.
Background: Many buildings in Egypt e.g. museums, mosques and churches, do not possess controlled environments for minimizing the risks of damage of wooden artifacts due to the growth of fungi. Fungal damage usually appears as change in wood color, appearance of stains, and sometimes deformation of wooden surfaces. In this study we focused on the effect that some fungi exert on the properties of wooden artifacts and evaluated the effectiveness of different concentrations of chitosan on their protection against damage by mold fungi. Results: Samples were collected from different monuments and environments, and fungi growing on them were isolated and identified. The isolated Penicillium chrysogenum, Aspergillus flavus and /Aspergillus niger strains were used...
Tipo: Journal article
Palavras-chave: Archeological wood; Chitosan protection; Crystallinity index; Damage of wooden artifacts; Filamentous fungi; FTIR; Fungal damage; Prevention of fungal growth; UV spectrophotometry; Wood deterioration; XRD.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600011

Crystal-chemistry of interstratified Mg/Fe-clay minerals from seafloor hydrothermal sites
Provedor de dados: 5
Autores: Cuadros, Javier; Michalski, Joseph R.; Dekov, Vesselin; Bishop, Janice; Fiore, Saverio; Dyar, M. Darby.
Seafloor hydrothermal sites generate abundant Mg- and Fe-rich clays. These clays are structurally and compositionally interesting because these environments are characterized by large, dynamic temperature and chemical gradients in their deposition environment, which promote the formation of chemically and structurally complex clays, including interstratified phases. The system is also interesting as a proxy for the study of the large Mg- and Fe-rich phyllosilicate deposits on Mars, which are broadly characterized as smectitic clay of hydrothermal, volcanic or sedimentary origin. Thirty submarine samples and four terrestrial ones, for comparison, were studied by means of X-ray diffraction (XRD), thermogravimetry (TG), mid-IR and Mössbauer spectroscopies and...
Tipo: Text
Palavras-chave: Interstratified clays; Martian clays; Submarine hydrothermal sites; Thermogravimetry; XRD.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00160/27131/25329.pdf

Chemical properties and mineralogy of soils with plinthite and petroplinthite in Iranduba (AM), Brazil
Provedor de dados: 90
Autores: Garcia,Cira Hortensia Pérez; Lima,Hedinaldo Narciso; Silva,Francisco Weliton Rocha; Neves Junior,Afrânio Ferreira; Teixeira,Wenceslau Geraldes; Macedo,Rodrigo Santana; Tavares,Sérgio Guimarães.
Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are fairly common in the Brazilian Amazon basin. This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM (Central Amazon). Three well-drained soil profiles at high elevations were studied (P1, Plinthic Vetic Ferralsol; P2 and P3, Vetic Endopetric Plinthosol) and a contrasting poorly drained soil (P4 Haplic Plinthosol), located at low elevation. After profile descriptions, soil samples were collected from each horizon, air-dried, sieved (2 mm), and analyzed for particle-size distribution, pH, exchangeable cations (Al3+,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plinthosol; Soil fertility; XRD; Weathering degree; Central Amazon.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400011

Influence of accumulation of heaps of steel slag on the environment: determination of heavy metals content in the soils
Provedor de dados: 42
Autores: Garcia-Guinea,Javier; Correcher,Virgilio; Recio-Vazquez,Lorena; Crespo-Feo,Elena; Gonzalez-Martin,Rafael; Tormo,Laura.
The presence of high level of heavy metals involves a human healthy risk that could induce chronic diseases. This work reports on the metal contamination due to heaps of steel-slag accumulated during more than 40 years in allotments and industrial areas in the southern part of Madrid (Spain). Several slag and soil samples were collected in an area of 10 km² and characterized by different conventional (XRD and XRF) and no so common methods (ESEM, thermoluminescence and EDS-WDS). The analysis reveal the presence of: (i) important amounts of Fe (43%), Mg (26%), Cr (1.1%), Mn (4.6%), S (6.5%) in the form of Fe-rich slag phases (wustite, magnetite...), Si and Ca-rich phases (larnite, ghelenite...), Cr (chromite), Mn (bustamite) and graphite, (ii) traces of some...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDS; ESEM; Metal contamination; Steel slag; TL; XRD; XRF.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200003

Major soil classes of the metropolitan region of Curitiba (PR), Brazil: I - mineralogical characterization of the sand, silt and clay fractions
Provedor de dados: 52
Autores: Pires,Ana Christina Duarte; Melo,Vander de Freitas; Lima,Valmiqui Costa; Motta,Antônio Carlos Vargas.
The aim of this work was to evaluate the mineralogical and chemical characteristics of most representative soils of the Region of Curitiba, Paraná State. Samples were collected at different depths. The results showed: (a) the quartz was the only identified mineral at the silt and sand fractions. The dominant clay mineral was Kaolinite, with contents ranging from 676.7 to 820.8 g kg-1. The gibbsite was also an important constituent of the most weathered horizons and the hematite and goethite contents were low, mainly in the Histosol; (b) at the C horizon of the Inceptisol, high intensity of vermiculite/smectite reflections were detected (X-ray diffraction), justifying the high capacity of expansion and contraction, normally showed for this soil horizon; (c)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kaolinite; Crystalline and amorphous Fe and Al oxides; 2:1 minerals; XRD.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200001

Optimization of Parameters for Biosynthesis of Silver Nanoparticles Using Leaf Extract of Aegle marmelos
Provedor de dados: 52
Autores: Christopher,JohnSamuel Godwin; Saswati,Banerjee; Ezilrani,PanneerSelvam.
ABSTRACTThe aim of this study was to optimize the biosynthesis of silver nanoparticles using leaves ofAegle marmelos as the primary source. The optimal reaction medium comprised 2:1 concentration of leaf extract and 6mM concentration of silver nitrate solution (pH 7. The biosynthesized silver nanoparticles were confirmed by UV-Vis spectroscopy at 420 nm, XRD and FTIR analysis. The antimicrobial properties of silver nanoparticles were confirmed withBacillus subtilis andPseudomonas aeruginosa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AgNO3; Aegle marmelos leaf; UV-Vis spectroscopy; XRD; FTIR.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500702

Mineralogy, zinc kinetic adsorption and sequential extraction of contaminated soil in Manaus, Amazon
Provedor de dados: 65
Autores: Souza,Wamber Broni de; Santana,Genilson Pereira.
Zinc is a heavy metal that enters the environment as consequence of both natural and anthropogenic activities. The association of the soil geochemical fractions and adsorption kinetics were studied to evaluate the behavior of the Zn in a contaminated Utisol soil. The contaminated soil samples were collected at depth 0-20, 20-40, 40-60, and 60-80cm into the Manaus Industrial District (MID) region. The study was performed in soil fractions at 50µm being the samples submitted to sequential extraction, batch experiments, X-ray diffraction (XRD) and Fourier transformed infrared spectroscopy (FT-IR). The adsorption kinetics was fitted according to Lagergren equation. The physical and chemical proprieties of soil showed that organic matter has low cation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manaus Industrial District; Utisol soil; Kaolinite; XRD; FT-IR.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000500005