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Combining Ability in Mixtures of Prairie Grass and Clovers

American Journal of Plant Sciences 2012年第10期3卷 1355-1360页

作者： Miguel Jacinto Arturi Mónica Beatriz Aulicino oscar ansín Gustavo Gallinger Rodolfo Signorio Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La PlataCalle 60 y 119 S/NCC·31(1900)La PlataProvincia de Buenos AiresArgentina Instituto Fitotécnico de Santa Catalina FCAFUNLPGaribaldi 3400(1836)LlavallolProvincia de Buenos AiresArgentina Estación Experimental J.Hirschhorn FCAFUNLPCalle 66 y 166 S/NLos HornosProvincia de Buenos AiresArgentina

Our objective was to evaluate the combining ability among cultivars of forage species, commonly sown in temperate regions of Argentina using a short rotation system. Three genetically diverse cultivars of prairie brome grass (Bromus catharticus, cv Copetona, cv ?andú and cv Tango), a white clover cultivar (Trifolium repens, cv Lucero) and a red clover cultivar (T. pratense, cv Tropero) were evaluated. A randomized complete block design experiment was established in 2005. The treatments included five monocultures and ten binary mixtures. The experiment was harvested 6 times over an 18-month period. Cumulative dry matter yield (kg?ha–1) was calculated as the sum of the six individual harvests. Diallel analysis provided estimates of the general combining ability (GCA) and specific combining ability (SCA). Red clover in monoculture and mixtures produced the highest yields, with significant positive GCA effects (P P P P n the short-term nature of this study, we must limit our inference to short-term pastures (nder these conditions, red clover had the best combination with prairie brome grass.

关键词： Bromus catharticus Trifolium repens T. pretense Grass/Legume Mixtures Dry Matter Yield Argentina

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One-pot Synthesis of TiO2 nanoparticles in Suspensions for Quantification of Titanium Debris Release in Biological Liquids

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Advances in nanoparticles 2012年第3期1卷 86-94页

作者： Christophe Massard Daniel Bourdeaux Vincent Raspal Emmanuelle Feschet-Chassot Yves Sibaud Eric Caudron Thierry Devers Kolma oscar Awitor C-BIOSEnSS Clermont Université Université d’Auvergne Clermont Ferrand France CRMD CNRS Université d’Orléans Chartres France

In this work we have developed an analytical method to measure potential titanium debris released from TiO2 nanotube layers devices immersed in biological fluids. This quantitative study is highly required to ensure both the security and non toxicity of the nanostructured surfaces used as future implantable medical devices in the living. A one-pot synthesis process is developed to produce high quality standard solutions of titanium dioxide nanoparticles in aqueous medium. The elaborated dispersion is then used to fabricate standard solutions in both aqueous and human blood plasma media. The synthesized nanoparticles dispersion was characterized by granulometry. The nanoparticles structure and morphology were then observed using Transmission Electron Microscopy (TEM). Thermogravimetric Analysis (TGA) was used to evaluate the concentration of TiO2 in the suspension. A quantitative routine by the use of Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) is developed. The quantification threshold of titanium species is found to be in the 30 - 40 ppb range. none interference is detected between the particles and the human blood plasma. Using the established quantitative routine, the titanium species release from titania nanotube layers in human blood plasma is evaluated.

关键词： Titanium Dioxide nanotube Layer TiO2 nanoparticles Debris Release Biological Matrix Inductively Coupled Plasma Atomic Emission Spectroscopy

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