392 research outputs found

    40Ar-39Ar age of the copper mineralization at riacho do pontal IOCG district and detrital zircon U–Pb ages of paragneiss host rocks

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    Geological, structural and metallogenetic characteristics related to the Proterozoic Riacho do Pontal iron-oxide copper gold (IOCG) mineral systems in northeast Brazil have been reinterpreted recently and there is an ongoing discussion regarding their genetic model and associated tectonic setting. The mineralization in the Riacho do Pontal district is represented by small copper deposits strongly controlled by the structural features of the basement rocks. Hydrothermal biotite associated with the copper mineralization has a 40Ar-39Ar of ca. 691 Ma, indicating a probable late Neoproterozoic age for the main mineralization event. Detrital zircon grains from the host rock show that the sedimentary protolith is younger than ca. 2035 Ma and was probably deposited in a convergent setting. Our results help to understand the emplacement of this deposit in the tectonic context of the Riacho do Pontal Belt

    A Portuguese patient homozygous for the -25G>A mutation of the HAMP promoter shows evidence of steady-state transcription but fails to up-regulate hepcidin levels by iron.

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    Blood. 2005 Oct 15;106(8):2922-3. A Portuguese patient homozygous for the -25G>A mutation of the HAMP promoter shows evidence of steady-state transcription but fails to up-regulate hepcidin levels by iron. Porto G, Roetto A, Daraio F, Pinto JP, Almeida S, Bacelar C, Nemeth E, Ganz T, Camaschella C. PMID: 16204153 [PubMed - indexed for MEDLINE]Free Article Publication Types, MeSH Terms, SubstancesPublication Types: Letter Research Support, Non-U.S. Gov't MeSH Terms: Antimicrobial Cationic Peptides/genetics* Antimicrobial Cationic Peptides/urine Glycine/genetics* Hemochromatosis/genetics Homozygote* Humans Iron/pharmacology* Mutation/genetics Portugal Promoter Regions, Genetic/genetics* Transcription, Genetic/genetics* Up-Regulation/drug effects* Substances: Antimicrobial Cationic Peptides hepcidin Glycine Iron LinkOut - more resourcesFull Text Sources: HighWire Press EBSCO Other Literature Sources: COS Scholar Universe Medical: Genetics Home Reference - HAMP Gene - Genetics Home Reference Molecular Biology Databases: IRON - HSDB GLYCINE - HSD

    O espaço público e as pessoas: Baixa de Algés

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    As cidades concentram pessoas que circulam pelas ruas, um espaço público que tem o privilégio de permear toda a cidade e que é potencialmente um elemento integrador. As ruas têm resgatado uma importante função social, revelando-se um lugar de estadia e convívio, onde os citadinos podem interagir entre si e com o ambiente. Quando as ruas estão preparadas para adotarem essas funções, são estabelecidas novas dinâmicas que promovem as vertentes da sustentabilidade – a ambiental, a social, a económica e também a cultural. Neste contexto, este trabalho, aborda a escala humana do planeamento urbano, como elemento promotor do desenvolvimento sustentável. Procedeu-se ao estudo de caso de um trecho do espaço público da Baixa de Algés, no Concelho de Oeiras, em Portugal, no que respeita às transformações do seu uso e morfologia, durante a vigência do atual Plano Diretor Municipal (PDM), desde 1994 até 2014. A partir de um estudo exploratório, abarcado por visitas ao local, pesquisa documental e aplicação de inquéritos, foi possível perceber as suas caraterísticas, as intervenções realizadas e a perceção das pessoas relativamente às mesmas, e concluir que o desenho atual desse trecho do espaço público não fomenta dinâmicas que promovam o desenvolvimento sustentável.info:eu-repo/semantics/publishedVersio

    Excited States in 52Fe and the Origin of the Yrast Trap at I=12+

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    Excited states in 52Fe have been determined up to spin 10\hbar in the reaction 28Si + 28Si at 115 MeV by using \gamma-ray spectroscopy methods at the GASP array. The excitation energy of the yrast 10+ state has been determined to be 7.381 MeV, almost 0.5 MeV above the well known \beta+-decaying yrast 12+ state, definitely confirming the nature of its isomeric character. The mean lifetimes of the states have been measured by using the Doppler Shift Attenuation method. The experimental data are compared with spherical shell model calculations in the full pf-shell.Comment: 9 pages, RevTeX, 7 figures include
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