699 research outputs found

    Re-dise√Īo de un modelo de abastecimiento mediante la inclusi√≥n de informaci√≥n en el punto de venta

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    Esta tesis investiga las oportunidades de aplicar informaci√≥n de punto de venta con el objeto de mejorar el proceso de aprovisionamiento a determinados clientes. La informaci√≥n de punto de venta incluye √≠tems vendidos por los distribuidores, inventario en los distribuidores, √≥rdenes de compra colocadas, inventarios en la planta productora. El proyecto est√° basado en un caso pr√°ctico de Danone Early Life Nutrition Argentina (unidad de negocios de f√≥rmulas l√°cteas infantiles del Grupo Danone en Argentina), cuya planta produce alimentos para beb√©s en el mercado local y tambi√©n para su exportaci√≥n y posterior consumo en lo mercados de Latino Am√©rica. Cuantitativamente se eval√ļan las oportunidades de mejora en el proceso de estimaci√≥n de la demanda, en el m√©todo de pedido, en nivel de inventario y en la log√≠stica. Cualitativamente se eval√ļa la efectividad de utilizar informaci√≥n de punto de venta con el objetivo de mejorar los procesos colaborativos entre los diferentes actores de la cadena. Los resultados esperados tienen que ver con la mejora del costo total de abastecimiento y de all√≠ el resultado de negocio

    EF Loop Conformational Change Triggers Ligand Binding in ő≤-Lactoglobulins

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    Beta-lactoglobulins, belonging to the lipocalin family, are a widely studied group of proteins, characterized by the ability to solubilize and transport hydrophobic ligands, especially fatty acids. Despite many reports, the mechanism of ligand binding and the functional role of these proteins is still unclear, and many contradicting concepts are often encountered in the literature. In the present paper the comparative analysis of the binding properties of beta-lactoglobulins has been performed using sequence-derived information, structure-based electrostatic calculations, docking simulations, and NMR experiments. Our results reveal for the first time the mechanism of beta-lactoglobulin ligand binding, which is completely determined by the opening-closing of EF loop, triggered by Glu89 protonation. The alkaline shift observed for Glu89 pKa in porcine beta-lactoglobulin (pKa 9.7) with respect to the bovine species (pKa 5.5) depends upon the interplay of electrostatic effects of few nearby key residues. Porcine protein is therefore able to bind fatty acids provided that the appropriate pH solution conditions are met (pH > 8.6), where the EF loop conformational change can take place. The unusually high pH of binding detected for porcine beta-lactoglobulin seems to be functional to lipases activity. Theoretical pKa calculations extended to representative beta-lactoglobulins allowed the identification of key residues involved in structurally and functionally important electrostatic interactions. The results presented here provide a strong indication that the described conformational change is a common feature of all beta-lactoglobulins

    Placido disk-based topography versus high-resolution rotating scheimpflug camera for corneal power measurements in keratoconic and post-lasik eyes: Reliability and agreement

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    AIM: To compare the repeatability/reproducibility of measurement by high-resolution Placido disk-based topography with that of a high-resolution rotating Scheimpflug camera and assess the agreement between the two instruments in measuring corneal power in eyes with keratoconus and post-laser in situ keratomileusis (LASIK). METHODS: One eye each of 36 keratoconic patients and 20 subjects who had undergone LASIK was included in this prospective observational study. Two independent examiners worked in a random order to take three measurements of each eye with both instruments. Four parameters were measured on the anterior cornea: steep keratometry (Ks), flat keratometry (Kf), mean keratometry (Km), and astigmatism (Ks-Kf). Intra-examiner repeatability and inter-examiner reproducibility were evaluated by calculating the within-subject standard deviation (Sw) the coefficient of repeatability (R), the coefficient of variation (CoV), and the intraclass correlation coefficient (ICC). Agreement between instruments was tested with the Bland-Altman method by calculating the 95% limits of agreement (95% LoA). RESULTS: In keratoconic eyes, the intra-examiner and inter-examiner ICC were >0.95. As compared with measurement by high-resolution Placido disk-based topography, the intra-examiner R of the high-resolution rotating Scheimpflug camera was lower for Kf (0.32 vs 0.88), Ks (0.61 vs 0.88), and Km (0.32 vs 0.84) but higher for Ks-Kf (0.70 vs 0.57). Inter-examiner R values were lower for all parameters measured using the high-resolution rotating Scheimpflug camera. The 95% LoA were -1.28 to +0.55 for Kf, -1.36 to +0.99 for Ks, -1.08 to +0.50 for Km, and -1.11 to +1.48 for Ks-Kf. In the post-LASIK eyes, the intra-examiner and inter-examiner ICC were >0.87 for all parameters. The intra-examiner and inter-examiner R were lower for all parameters measured using the high-resolution rotating Scheimpflug camera. The intra-examiner R was 0.17 vs 0.88 for Kf, 0.21 vs 0.88 for Ks, 0.17 vs 0.86 for Km, and 0.28 vs 0.33 for Ks-Kf. The inter-examiner R was 0.09 vs 0.64 for Kf, 0.15 vs 0.56 for Ks, 0.09 vs 0.59 for Km, and 0.18 vs 0.23 for Ks-Kf. The 95% LoA were -0.54 to +0.58 for Kf, -0.51 to +0.53 for Ks and Km, and -0.28 to +0.27 for Ks-Kf. CONCLUSION: As compared with Placido disk-based topography, the high-resolution rotating Scheimpflug camera provides more repeatable and reproducible measurements of Ks, Kf and Ks in keratoconic and post-LASIK eyes. Agreement between instruments is fair in keratoconus and very good in post-LASIK eyes

    Omega 3 fatty acid supplementation after myocardial infarction: A systematic review and meta-analysis

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    Background: The purpose of this review is to examine the effect of Omega-3 Fatty acids on mortality, morbidity, and adverse events in patients with acute myocardial infarction (AMI). Methods: Data Sources: MEDLINE, EMBASE, and the Cochrane Library through May 2018. Study Selection: Randomized Controlled trials (RCT). Certainty of evidence was assessed with the GRADE system. Interventions: omega 3 fatty acids against placebo or no treatment. Primary and secondary outcomes: All-cause death, cardiovascular death, new AMI, stroke, need for therapeutic angioplasty or By-pass, new diagnosis of cancer and incidence of adverse events. Results: For the efficacy endpoints we included 10 RCT (24,414 patients). Omega 3 fatty acids probably make little or no difference to all-cause mortality (4 studies 9141 patients RR 1.06 - CI95% 0.90 to 1.27, moderate certainty), cardiovascular mortality (3 studies 4304 patients RR 0.93 - CI95% 0.63 to 1.37, moderate certainty), new AMI (RR 1.24 CI95% 0.71 to 2.14 - moderate certainty), any cardiovascular event (RR 0.95 95%CI 0.86 to 1.05; low certainty due to risk of bias and imprecision), and stroke (RR 1.2 95%CCI 0,66-2,19 - moderate certainty). Regarding adverse events, we are uncertain if Omega 3 fatty acids improve/reduce non severe adverse events (RR 1.39 95% CI 0.36 to 5.34; very low certainty). There is probably little or no difference in the outcome suspension due to adverse events (RR 1.19 CI 95% 0.97 to 1.47; moderate certainty). Conclusions: For adult patients with AMI, omega 3 fatty-acids probably yield no benefit to patient important outcomes.Fil: Popoff, Federico. Ministerio de Salud de la Naci√≥n; ArgentinaFil: Balaciano, Giselle. Hospital Aleman; ArgentinaFil: Bardach, Ariel Esteban. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Oficina de Coordinaci√≥n Administrativa Parque Centenario. Centro de Investigaciones en Epidemiolog√≠a y Salud P√ļblica. Instituto de Efectividad Cl√≠nica y Sanitaria. Centro de Investigaciones en Epidemiolog√≠a y Salud P√ļblica; ArgentinaFil: Comand√©, Daniel. Instituto de Efectividad Cl√≠nica y Sanitaria; ArgentinaFil: Irazola, Vilma. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Oficina de Coordinaci√≥n Administrativa Parque Centenario. Centro de Investigaciones en Epidemiolog√≠a y Salud P√ļblica. Instituto de Efectividad Cl√≠nica y Sanitaria. Centro de Investigaciones en Epidemiolog√≠a y Salud P√ļblica; ArgentinaFil: Catalano, Hugo Norberto. Ministerio de Salud de la Naci√≥n; ArgentinaFil: Izcovich, Ariel. Hospital Aleman; Argentin
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