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Now showing items 1 - 16 of 88

  • Ceratocystis fimbriata on kiwifruit (Actinidia spp.) in Brazil

    Piveta, G.   Ferreira, M. A.   Muniz, M. F. B.   Valdetaro, D.   Valdebenito-Sanhueza, R.   Harrington, T.   Alfenas, A. C.  

    Ceratocystis fimbriata causes wilt and death of plants in several important crops and native vegetation in Brazil. Ceratocystis wilt was recently found to be causing substantial mortality in kiwifruit (Actinidia deliciosa and A. chinensis) in the Farroupilha region of Rio Grande do Sul. The aim of this study was to describe the symptomatology of the new disease and characterise isolates of C. fimbriata obtained from kiwifruit plants. Affected plants showed substantial discoloration of the woody xylem and wilt-type symptoms of the foliage, with eventual death of the whole plant. Phylogenetic analysis of ITS rDNA of 39 isolates from kiwifruit identified five haplotypes, which were placed in the Latin American clade of C. fimbriata. The ITS haplotypes were morphologically similar to isolates of C. fimbriata from other hosts in Brazil. Eight isolates of four ITS haplotypes varied somewhat in aggressiveness to three kiwifruit cultivars (Monty, Hayward and Elmwood), but all isolates were pathogenic and all three cultivars were susceptible.
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  • Optimizing Cs2LiYCl6 for fast neutron spectroscopy

    D'Olympia, N.   Chowdhury, P.   Guess, C. J.   Harrington, T.   Jackson, E. G.   Lakshmi, S.   Lister, C. J.   Glodo, J.   Hawrami, R.   Shah, K.   Shirwadkar, U.  

    Cs2UYCl6 (CLYC) has generated recent interest as a thermal neutron detector due to its excellent n/gamma-ray pulse-shape discrimination and energy resolution. Here, the capabilities of CLYC as a fast neutron detector and spectrometer are reported. A 1 in. x 1 in. CLYC detector was used to measure the response of mono-energetic neutrons over a range of 0.8-2.0 MeV produced via the Li-7(p,n) reaction at the University of Massachusetts Lowell 5.5 MV Van de Graaff accelerator. A broad continuum from the Li-6(n, alpha) reaction was observed, as well as additional peaks below the thermal capture peak. Based on possible reactions in CLYC, the additional peaks are determined to be due to the Cl-35(n,p)S-35 reaction, with a Q-value of +615 keV, and corroborated in simulations using MCNPX. The average resolution of 9% for these peaks makes CLYC a promising candidate for a fast neutron spectrometer. Published by Elsevier B.V.
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  • Macro-arthropod succession in grassland growing on bauxite residue

    Courtney, R.   O'Neill, N.   Harrington, T.   Breen, J.  

    Ecosystem functions such as nutrient cycling are crucial components of revegetation programmes for bauxite residues and other tailings. Whilst vegetation establishment on bauxite residue is well studied, little is known about the development of the soil-biota. Macro-arthropod assemblages have been used to monitor and evaluate restoration success on a variety of mine spoils, but there is no information on its presence in bauxite residues. In order to understand the colonization and community development of macro-arthropods in revegetated residue, we compared species from two revegetated residues with an unamended site using pitfall and pan trap techniques. Whilst relatively few immobile species were present in the unamended site, high diversity was recorded for the revegetated sites. A number of species representative of predatory and carnivorous trophic structure were identified for the two vegetated sites. Additionally, many species identified are indicative of later stages of succession. These findings indicate that bauxite residues can be successfully restored to a functioning grassland type ecosystem. Monitoring of key arthropod species is recommended as part of the restoration evaluation process. (C) 2010 Elsevier B.V. All rights reserved.
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  • Assessment of plant-available phosphorus in a fine textured sodic substrate

    Harrington, T.  

    The objective of this study was to determine how common soil P extractants compared when assessed on revegetated bauxite residue. Samples from contrasting residue preparation, amended with gypsum and/or organic matter, were analyzed for phosphorus using CaCl2, Morgans, Olsen and Colwell extractants. Herbage samples were also taken from the residue and phosphorus content and biomass determined. Phosphorus adsorption in the different treatments was also assessed.Amounts determined by CaCl2 were below limits of detection and Morgans extractant overestimated amounts of plant available P. P levels determined by Olsen extractant were within the deficiency range. Colwell P. although overestimated plant available P. did correlate with vegetation performance (biomass production) and amount of P added to the substrate. Plant indices (P-content and biomass) were correlated with organic and Ca content of the substrate.Fine particle size of the substrate resulted in increased rate of P adsorption and Ca-content further increased the rate. However, overall Ca content of the residue improved P-uptake and nutrition. (C) 2009 Elsevier B.V. All rights reserved.
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  • Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore-Particle Structure Orientation

    Torresani, E.   Giuntini, D.   Zhu, C.   Harrington, T.   Vecchio, K. S.   Molinari, A.   Bordia, R. K.   Olevsky, E. A.  

    A micromechanical model for the shrinkage anisotropy during sintering of metallic powders is proposed and experimentally assessed. The framework developed for modeling sintering based on the mechanism of grain boundary diffusion is extended to take into account the dislocation pipe-enhanced volume diffusion. The studied iron powder samples are pre-shaped into their green forms by uniaxial cold pressing before sintering step. The resultant green bodies are anisotropic porous structures, with inhomogeneous plastic deformation at the inter-particle contacts. These non-uniformities are considered to be the cause of the anisotropic dislocation pipe diffusion mechanisms, and thus of the undesired shape distortion during shrinkage. The proposed model describes the shrinkage rates in the compaction loading and transverse directions, as functions of both structural and geometric activities of the samples. Dislocation densities can be estimated from such equations using dilatometry and image analysis data. The reliability and applicability of the developed modeling framework are verified by comparing the calculated dislocation densities with outcomes of nanoindentation and electron backscatter diffraction-derived lattice rotations.
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  • Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore–Particle Structure Orientation

    Torresani, E.   Giuntini, D.   Zhu, C.   Harrington, T.   Vecchio, K. S.   Molinari, A.   Bordia, R. K.   Olevsky, E. A.  

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  • PHYSICO-CHEMICAL CHANGES IN BAUXITE RESIDUE FOLLOWING APPLICATION OF SPENT MUSHROOM COMPOST AND GYPSUM

    Courtney, R. G.   Jordan, S. N.   Harrington, T.  

    Physical properties exhibited by unvegetated mine wastes pose limitations to vegetation establishment and growth. In an attempt to promote vegetation cover on bauxite residue, a field trial was established to determine the effect of spent mushroom compost (SMC) and gypsum amendment on enhancing the physical properties of the residue. SMC was incorporated at rates of 0, 60, 80 and 120 t ha(-1) with gypsum at 0.40 and 90 t ha(-1) and Holcus lanatus sown at a rate of 80 kg ha(-1). The addition of SMC and gypsum was beneficial in improving the physical properties of the residue and promoting growth. Principally increasing organic content of the residue decreased bulk density and particle density whilst improving substrate porosity. Residue pH. EC and sodicity of the residue were also affected by the amendments, which positively impacted on microaggregate stability and preventing clay dispersion. Pearson correlations demonstrate that the most significant parameters in determining clay dispersion potential are the pH and the exchangeable sodium percentage (ESP) of the residue. Copyright (C) 2009 John Wiley & Sons, Ltd.
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  • A New Generation of Self-Report Methodology and Validity Evidence of the Ability Explorer

    Harrington, T.   Harrington, J.  

    Ability scores derived from a new generation of self-report methodology are reported that show patterns which differentiate between college majors. Validation evidence based on job analysis data and self-report concurrent samples is presented.
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  • Occupational Healthby J. M. Harrington; F. S. Gill; T. C. Aw; K. Gardiner

    Review by: S. J. Mitchell  

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  • Occupational Healthby J. M. Harrington; F. S. Gill; T. C. Aw; K. Gardiner

    Review by: S. J. Mitchell  

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  • Overuse ballet injury of the base of the second metatarsal: A diagnostic problem

    Harrington, T.   Crichton, K. J.   Anderson, I. F.  

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  • In memoriam: John T. Harrington

    Levey, Andrew S.; Madias, Nicolaos E.  

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  • GROWTH AND NUTRITION OF HOLCUS LANATUS IN BAUXITE RESIDUE AMENDED WITH COMBINATIONS OF SPENT MUSHROOM COMPOST AND GYPSUM

    Courtney, R.   Harrington, T.  

    Bauxite residues are very slow to naturally vegetate due to nutrient deficiency and high sodicity. In order to test the effectiveness of amendments at promoting revegetation, bauxite residue was amended with varying rates of compost to increase fertility (0, 60, 80 and 120 t ha(-1)) and gypsum to reduce sodicity (0, 40 and 90 t ha(-1)). Amended residue was sown with Holcus lanatus, a perennial grass. Following a 1-year growth period, substrate properties, plant performance and plant nutrient uptake were assessed. Compost application substantially increased substrate N, P, K and Mn concentrations, while gypsum application greatly reduced sodicity and improved nutrient uptake for Mn and P. Compost amendment was essential for sustainable plant growth. Foliar deficiencies in N, P and Mg may persist with lower compost application rates, requiring the addition of supplemental fertiliser for healthy plant growth. Copyright (c) 2010 John Wiley & Sons, Ltd.
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  • Sacra Paginaby Wilfrid J. Harrington;The Message of the Book of Revelationby Charles T. Chapman,

    Review by: John Byrne  

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  • Sacra Paginaby Wilfrid J. Harrington;The Message of the Book of Revelationby Charles T. Chapman,

    Review by: John Byrne  

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  • Civilian gunshot wounds to the head: A prospective study: Grahm TW, Williams FC, Harrington T, et al Neurosurgery 27: 696–700 Nov 1990

    Juliana Karp  

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