212 research outputs found

    Sorption of the herbicide linuron by Layered Double Hydroxide

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    II Encuentro sobre nanociencia y nanotecnología de investigadores y tecnólogos de la Universidad de Córdoba. NANOUC

    Stenodrepanum bergii Harms

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    Am Rande der Salinas von Catamarca En las orillas de las salinas, cerca del F.C.C.A., 1/2 legua de TotoralejospublishedVersio

    A systematic study of spin-dependent recombination in GaAs1x_{1-x}Nx_x as a function of nitrogen content

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    A systematic study of spin-dependent recombination (SDR) under steady-state optical pumping conditions in dilute nitride semiconductors as a function of nitrogen content is reported. The alloy content is determined by a fit of the photoluminescence (PL) intensity using a Roosbroeck-Shockley relation and verified by a study of the GaN-like LO2_2 phonon peak in a Raman spectroscopy map. PL spectra taken from alloys of the form GaAs1x_{1-x}Nx_x where 0.022<x<0.0360.022 < x < 0.036 exhibit PL intensity increases when switching from a linearly- to a circularly-polarized pump up to a factor of 5 for x=0.022x = 0.022. This work used a 1.39 eV laser with a radius of 0.6 μ\mum. The observed SDR ratio monotonically decreases with increasing xx, reaching 1.5 for x=0.036x = 0.036. Moreover, the excitation power required to obtain maximum SDR systematically increases with increasing xx, varying from 0.6 mW for x=0.022x = 0.022 to 15 mW for x=0.036x = 0.036. These observations are consistent with an increase in the density of electronically active defects with increasing nitrogen content, both those responsible for the SDR as well as other, standard Shockley-Read-Hall (SRH) centers.Comment: 11 pages, 5 figures; work presented at the International Conference on the Physics of Semiconductors, Sydney, 202

    Incorporación de herbicidas en hidrotalcitas modificadas

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    III Encuentro sobre Nanociencia y Nanotecnología de Investigadores y Tecnólogos Andaluce

    Nanopigmentos laminares: AO-10 en hidrotalcitas

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    III Encuentro sobre Nanociencia y Nanotecnología de Investigadores y Tecnólogos Andaluce

    Hidroxidos dobles laminares como materiales adsorbentes de contaminantes en aguas

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    II Encuentro sobre nanociencia y nanotecnología de investigadores y tecnólogos de la Universidad de Córdoba. NANOUC

    Evaluation of dietary supplementation of a novel microbial muramidase on gastrointestinal functionality and growth performance in broiler chickens

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    This study was conducted to assess the effect of dietary supplementation of Muramidase 007 to broiler chickens on gastrointestinal functionality, evaluating growth performance, apparent ileal digestibility, intestinal histomorphology, vitamin A in plasma and cecal microbiota. A total of 480 one-day male chicks (Ross 308) were distributed in 16 pens allocated in 2 experimental diets: the control diet (CTR) without feed enzymes, coccidiostat or growth promoters, and the experimental diet (MUR): CTR supplemented with 35,000 units (LSU(F))/kg of the Muramidase 007. Digesta and tissue samples were obtained on days 9 and 36 of the study. A lower feed conversion ratio was observed in the MUR treatment. Apparent ileal digestibility of DM, organic matter and energy were improved by Muramidase 007. It was also observed that MUR improved digestibility of total fatty acids, mono-unsaturated fatty acids and poly-unsaturated fatty acids, and content of vitamin A in plasma at day 9 (P < 0.05). Histomorphological analysis of jejunum samples revealed no differences in the villus height or crypt depth; but a higher number of goblet cells and intraepithelial lymphocytes at day 36 with MUR. No differences were observed in plate counts of enterobacteria or Lactobacillus along the gastrointestinal tract, neither on the cecal short-chain fatty acids. An statistical trend was observed for reduction of cecal clostridia at day 9 for MUR. Analysis of cecal microbiota structure by 16S rRNA gene sequencing revealed relevant changes correlated to age. At day 9, broilers receiving MUR showed decreased alpha diversity compared to CTR that was not detected at day 36. Changes in specific taxonomic groups with an increase in Lactobacillus genus were identified. In conclusion, evaluation of the variables in this study indicates that dietary Muramidase 007 contributes to improve feed conversation ratio and gastrointestinal function in broiler chickens. Effects could have been mediated by slight shifts observed in the intestinal microbiota. More studies are guaranteed to fully understand the mechanisms involved.info:eu-repo/semantics/publishedVersio
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