Search results for "41"

Spherical ordered mesoporous silicas and silica monoliths as stationary phases for liquid chromatography

2006

Ordered mesoporous silicas such as micelle-templated silicas (MTS) feature unique textural properties in addition to their high surface area (approximately 1000 m2/g): narrow mesopore size distributions and controlled pore connectivity. These characteristics are highly relevant to chromatographic applications for resistance to mass transfer, which has never been studied in chromatography because of the absence of model materials such as MTS. Their synthesis is based on unique self-assembly processes between surfactants and silica. In order to take advantage of the perfectly adjustable texture of MTS in chromatographic applications, their particle morphology has to be tailored at the microme…

Influence of Laccase and Tyrosinase on the Antioxidant Capacity of Selected Phenolic Compounds on Human Cell Lines

2015

Polyphenolic compounds affect the color, odor and taste of numerous food products of plant origin. In addition to the visual and gustatory properties, they serve as radical scavengers and have antioxidant effects. Polyphenols, especially resveratrol in red wine, have gained increasing scientific and public interest due to their presumptive beneficial impact on human health. Enzymatic oxidation of phenolic compounds takes place under the influence of polyphenol oxidases (PPO), including tyrosinase and laccase. Several studies have demonstrated the radical scavenger effect of plants, food products and individual polyphenols in vitro, but, apart from resveratrol, such impact has not been prove…

Stereoselective Synthesis and Cytoselective Toxicity of Monoterpene-Fused 2-Imino-1,3-thiazines

2014

Starting from pinane-, apopinane- and carane-based 1,3-amino alcohols obtained from monoterpene-based β-amino acids, a library of monoterpene-fused 2-imino-1,3-thiazines as main products and 2-thioxo-1,3-oxazines as side-products were prepared via two- or three-step syntheses. When thiourea adducts prepared from 1,3-amino alcohols and aryl isothiocyanates were reacted with CDI under mild conditions, O-imidazolylcarbonyl intermediates were isolated which could be transformed to the desired 1,3-thiazines under microwave conditions. 1,3-Thiazines and 2-thioxo-1,3-oxazine side-products could also be prepared in one-step reactions through the application of CDI and microwave irradiation. The rin…

The Antigerminative Activity of Twenty-Seven Monoterpenes

2010

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The Essential Oil Compositions of Three Teucrium Taxa Growing Wild in Sicily: HCA and PCA Analyses

2021

The chemical composition and the qualitative and quantitative variability of the essential oils of three taxa belonging to the Teucrium genus were studied. The investigated taxa, that grow wild in Sicily, were Teucrium flavum L. (section Chamaedrys (Mill.) Scheb.), Teucrium montanum and Teucrium capitatum L. of section Polium (Mill.) Scheb. Essential oils were extracted by hydrodistillation and analyzed by GC-MS. In total, 74 compounds were identified. Sesquiterpene hydrocarbons were found to be the main group for T. flavum (48.3%). T. capitatum consisted essentially of monoterpene hydrocarbons (72.7%), with &alpha

Grafías para extended voice

2015

Purity rules in Pentecostal Uganda. Towards an analysis of relational rulework

2022

Rules concerning romantic relationships and sex—what we term ‘purity rules’—are central to Pentecostalism in Uganda. In  public church arenas, the born-again variant of the rules laid down during Uganda’s ‘ABC’ response to HIV/AIDS — ‘abstain till marriage and be faithful once you marry’—are presented as clear and non-negotiable. Yet in church members’ lives, and in their conversations with each other or in small church groups, space is often created for interpretation and deliberation about the officially strict rules. In this article, we use ethnographic material from fieldwork in urban Pentecostal churches in Uganda to describe how rules work on people, and people work on rules. We descr…

Aplicación de la topología molecular a la predicción y optimización de la actividad repelente de mosquitos de derivados de la N-acylpiperidina

2014

Se ha construido un modelo topológico-matemático con el fin de seleccionar nuevos repelentes de mosquito derivados de la N-acylpiperidina. Para ello se ha empleado la técnica estadística del análisis de regresión multilineal. Los compuestos empleados en la elaboración del modelo han sido caracterizados por medio de índices topológicos. Finalmente, se ha obtenido un modelo de 5 variables capaz de predecir los tiempos de protección de diversos repelentes de mosquitos derivados de la N-acylpiperidina (R2=0.8457 y Q2= 0.7486). El modelo ha sido validado mediante validación cruzada interna de tipo leave-one-out y un test de aleatoriedad. Los resultados han confirmado la capacidad del modelo para…

Análisis del tiempo de lucha y no lucha en taekwondistas cadetes

2016

La relación entre los tiempos de lucha (L) y no lucha (NL) ha sido utilizada para caracterizar las demandas físicas del taekwondo. El objetivo del presente estudio es analizar el tiempo de L y NL en función de la categoría de competición en taekwondistas cadetes (12-14 años). Se analizaron las fases del tiempo de movimiento (L y NL) de 47 combates del primer Campeonato del Mundo Cadete en función de la categoría de competición (minimosca, mosca, gallo, pluma, ligero, superligero, semimedio, medio, semipesado y pesado). Se utilizó el test Kruskal-Wallis seguido de las pruebas por pares de U de Mann Whitney para analizar las diferencias entre grupos (p < 0,05). Se encontraron diferencias sign…

Forecasting future trajectories for immersive journalism

2021

In this book we have critically explored the emerging practices of immersive journalism. In the news business, experimenting with new forms of storytelling has become the new normal. After spending a decade to get familiar with simple virtual reality tools, however, the future of immersive journalism is still considered uncertain. Immersive storytelling appears to become more concentrated on special events and locations. Journalistic virtual reality skills are increasingly crafted away from the newsrooms by small and specialized subcontractors. Sponsoring VR by the big tech companies tends to diminish in parallel with a growing move towards augmented reality investments. peerReviewed