[Montreal 1976] [Material gráfico]

Contiene fotografías pertenecientes al archivo fotográfico del diario "Región", publicadas entre 1974 y 1976, aunque la mayoría en 1976Todas las fotografías firmadas por Foto E. Gar (Oviedo), Cifra Gráfica, y EF

Pratt and Whitney EB-PVD TBC's

The goals of this project were to: determine the effect of shadowing in an EB-PVD process and support and document the development of a TBC thickness prediction model. EB-PVD tab array shadowing experiments were performed and a light box was constructed and tested using light intensity to model TBC thickness. Thickness trends found in several previous tab array experiments were analyzed. A P&W 4000 blade was coated to calibrate the TBC prediction model

Physiological Degradation of Pectin in Papaya Cell Walls: Release of Long Chains Galacturonans Derived from Insoluble Fractions During Postharvest Fruit Ripening

Papaya (Carica papaya L.) is a fleshy fruit that presents a rapid pulp softening during ripening. However, the timeline on how papaya pectinases act in polysaccharide solubilization and the consequent modification of the cell wall fractions during ripening is still not clear. In this work, the gene expression correlations between, on one hand, 16 enzymes potentially acting during papaya cell wall disassembling and, on the other hand, the monosaccharide composition of cell wall fractions during papaya ripening were evaluated. In order to explain differences in the ripening of papaya samplings, the molecular mass distribution of polysaccharides from water-soluble and oxalate-soluble fractions (WSF and OSF, respectively), as well as the oligosaccharide profiling from the WSF fraction, were evaluated by high performance size exclusion chromatography coupled to a refractive index detector (HPSEC-RID) and high performance anion-exchange chromatography coupled to pulse amperometric detection (HPAEC-PAD) analyses, respectively. Results showed that up-regulated polygalacturonase and β-galactosidase genes were positively correlated with some monosaccharide profiles. In addition, an overall increase in the retention time of high molecular weight (HMW) and low molecular weight (LMW) polysaccharides in WSF and OSF was shown. The apparent disappearance of one HMW peak of the OSF may result from the conversion of pectin that were crosslinked with calcium into more soluble forms through the action of PGs, which would increase the solubilization of polysaccharides by lowering their molecular weight. Thus, the results allowed us to propose a detailed process of papaya cell wall disassembling that would affect sensorial properties and post-harvesting losses of this commercially important fruit

Detecção de depósitos bauxíticos em coberturas lateríticas através de imagens TM, Sinclinal do Gandarela, Quadrilátero Ferrífero, MG

Pages: 275-28

Detecção de depósitos bauxiticos em coberturas lateriticas através de imagens Tm. Sinclinal do Gandarela. Quadrilatero Ferrifero.

Em vários pontos das superfícies de aplainamento cimeiras da região do Quadrilátero Ferrífero (MG) ocorrem pequenos depósitos de bauxita, que pelas suas reduzidas dimensões e associação com solos lateríticos e couraças ferruginosas, são de difícil caracterização em fotos aéreas 1: 25,000, Considerando que o sensor TM possui bandas espectrais que favorecem a identificação de óxidos de ferro como limonita, goethita, hematita e de minerais contendo íons hidroxila ou com ligação Al-OH (banda 7), utilizou-se de técnicas de realce para se tentar detectar e discriminar as ocorrências bauxiticas dos outros alteritos. Os resultados comprovaram que as melhores discriminações dos depósitos foram obtidas quando no processamento estava incluída a banda 7 (2, 08-2, 35u), cujo intervalo espectral contém típicas feições de absorção de materiais aluminosos. Neste caso, confirma-se que o atributo da resolução espectral das imagens Tm superou o atributo da resolução espectral das imagens Tm superou o atributo da resolução espacial das fotos aéreas pancromáticas.It is frequently in the region know as Iron Quadrangle (MG) the presence of small platos with small occurrence of bauxite deposits associated with ferruginous laterites and aluminou-ferruginous soils, which are not discriminated in aerial photos 1: 25,000. Since the Tm sensor combines spectral bands that are profitable to discrimination irom oxides and OH or AL bearing minerals, it was utilized in the present work, enhancement techniques to obtain the discrimination of bauxites deposits from the band 7 (2, 08-2, 35u), which spectral interval coincide which typical absortion bands of aluminou materials. The only enhancement technique that permited to discriminate the three kinds of materials was the principal component

Hydraulic conductivity of a soil irrigated with treated sewage effluent

International audienc

Influence of pedogenetic processes on the validity of kaolinite crystallinity indices: A case study of an Amazonian Ferralsol-Podzol soil system with white kaolin

International audienc