Radical intermediates in chloroform reactions over triphenylphosphine-protected Au nanoparticles

Reactions of chloroform over triphenylphosphine-protected Au nanoparticles have been studied using electron paramagnetic resonance (EPR) spectroscopy and a spin trapping technique. Two competing reactions, abstraction of hydrogen and halogen atoms, were identified. The hydrogen abstraction reaction showed an inverse kinetic isotope effect. Treatment of nanoparticles with oxidizing or reducing reagents made it possible to tune the selectivity of radical formation from halogen to hydrogen (deuterium) abstraction. Treatment with PbO2 promoted the deuterium abstraction reaction followed by the loss of nanoparticle activity, whereas treatment with NaBH4 regenerated the nanoparticle activity towards Cl atom abstraction. X-ray photoelectron spectroscopy showed an increased Au:P ratio upon treatment with oxidizing reagents. This is likely due to the oxidation of some phosphine ligands to phosphine oxides which then desorb from the nanoparticle surface. © 2009 The Royal Societ of Chemistry.

Comparative quantitative study of ‘signature’ pathological lesions in the hippocampus and adjacent gyri of 12 neurodegenerative disorders

The hippocampus (HC) and adjacent gyri are implicated in dementia in several neurodegenerative disorders. To compare HC pathology among disorders, densities of ‘signature’ pathological lesions were measured at a standard location in eight brain regions of 12 disorders. Principal components analysis of the data suggested that the disorders could be divided into three groups: (1) Alzheimer’s disease (AD), Down’s syndrome (DS), sporadic Creutzfeldt–Jakob disease, and variant Creutzfeldt–Jakob disease in which either β-amyloid (Aβ) or prion protein deposits were distributed in all sectors of the HC and adjacent gyri, with high densities being recorded in the parahippocampal gyrus and subiculum; (2) Pick’s disease, sporadic frontotemporal lobar degeneration with TDP-43 immunoreactive inclusions, and neuronal intermediate filament inclusion disease in which relatively high densities of neuronal cytoplasmic inclusions were present in the dentate gyrus (DG) granule cells; and (3) Parkinson’s disease dementia, dementia with Lewy bodies, progressive supranuclear palsy, corticobasal degeneration, and multiple system atrophy in which densities of signature lesions were relatively low. Variation in density of signature lesions in DG granule cells and CA1 were the most important sources of neuropathological variation among disorders. Hence, HC and adjacent gyri are differentially affected in dementia reflecting either variation in vulnerability of hippocampal neurons to specific molecular pathologies or in the spread of pathological proteins to the HC. Information regarding the distribution of pathology could ultimately help to explain variations in different cognitive domains, such as memory, observed in various disorders.

Dioxaborine dyes as fluorescent probes for amines and carbon nanotubes

The newly synthesized dioxaborine dyes were studied aiming to probe amines and carbon nanotubes, which are potential toxic industrial polluters. To detect the targeted analytes in efficient way, series of ca. 20 dioxaborine dyes were synthesized and tested for reactivity with amines and carbon nanotubes. The most promising result was showed for styryl dye with the fluorescent sensitivity to amines up to 1 ppm. A fluorescent response of the dioxaborine dyes on presence of carbon nanotubes was revealed.

Seasonal dynamic pattern analysis in service of climate change research. A methodical case-study - monitoring and simulation based on an aquatic insect community

Our aim was to approach an important and well-investigable phenomenon – connected to a relatively simple but real field situation – in such a way, that the results of field observations could be directly comparable with the predictions of a simulation model-system which uses a simple mathematical apparatus and to simultaneously gain such a hypothesis-system, which creates the theoretical opportunity for a later experimental series of studies. As a phenomenon of the study, we chose the seasonal coenological changes of aquatic and semiaquatic Heteroptera community. Based on the observed data, we developed such an ecological model-system, which is suitable for generating realistic patterns highly resembling to the observed temporal patterns, and by the help of which predictions can be given to alternative situations of climatic circumstances not experienced before (e.g. climate changes), and furthermore; which can simulate experimental circumstances. The stable coenological state-plane, which was constructed based on the principle of indirect ordination is suitable for unified handling of data series of monitoring and simulation, and also fits for their comparison. On the state-plane, such deviations of empirical and model-generated data can be observed and analysed, which could otherwise remain hidden.

Customer Satisfaction, Quality in Cruise Industry

Record numbers of passengers are sailing on board cruise ships, with the industry claiming high levels of customer satisfaction. Conversely, little is known about the specific factors which make up customer satisfaction with the cruise experience. The authors examine customer satisfaction data from nearly 15,000 guests of a large U.S. cruise line to determine which aspects of the cruise experience have the greatest impact on overall satisfaction and perceptions of quality.

The Beacon, October 30, 2009

Vol. 22, Issue 35, 12 pages

Expanding Vocabulary and Improving Comprehension Through the Use of Graphic Organizers

Expanding Vocabulary and Improving Comprehension Through the Use of Graphic Organizers

Florida International University Commencement Ceremony Spring April 30,2013 Session 3

Florida International University Commencement Ceremony, Spring, April 30,2013 (Session 3) Colleges graduated: College of Arts and Sciences- School of Environment, Arts and Society (SEAS) Graduation ceremony held at US Century Bank Arena

Global compilation of benthic data sets I

Approaches to quantify the organic carbon accumulation on a global scale generally do not consider the small-scale variability of sedimentary and oceanographic boundary conditions along continental margins. In this study, we present a new approach to regionalize the total organic carbon (TOC) content in surface sediments (<5 cm sediment depth). It is based on a compilation of more than 5500 single measurements from various sources. Global TOC distribution was determined by the application of a combined qualitative and quantitative-geostatistical method. Overall, 33 benthic TOC-based provinces were defined and used to process the global distribution pattern of the TOC content in surface sediments in a 1°x1° grid resolution. Regional dependencies of data points within each single province are expressed by modeled semi-variograms. Measured and estimated TOC values show good correlation, emphasizing the reasonable applicability of the method. The accumulation of organic carbon in marine surface sediments is a key parameter in the control of mineralization processes and the material exchange between the sediment and the ocean water. Our approach will help to improve global budgets of nutrient and carbon cycles.

Leading birds by their beaks : the response of flocks to external perturbations

Peer reviewed

Coupled transport in rotor models

Acknowledgement One of us (AP) wishes to acknowledge S. Flach for enlightening discussions about the relationship between the DNLS equation and the rotor model.

A minimal model of partial synchrony

We wish to acknowledge A Pikovsky and M Zaks for useful discussions. This work has been financially supported by the EU project COSMOS (642563).

Jornadas de Trabajo sobre Historia Reciente (7 : 2014 : La Plata). Mesas de debate de las VII Jornadas de Trabajo sobre Historia Reciente

Tabla de contenidos: Los años sesenta y setenta: formas y sentidos de la política y la militancia / María Cristina Tortti. ¿Quiénes somos? Sentidos de la revolución y lo cotidiano / Alejandra Oberti. Sentidos de la violencia revolucionaria / Vera Carnovale. Socialismo, peronismo y revolución: nudo político de la nueva izquierda / María Cristina Tortti. Problemas y debates en torno a la conceptualización de la dictadura y la represión / Gabriela Aguila. Violencia política, represión y terrorismo de estado: a propósito de algunas conceptualizaciones para definir el accionar represivo en la historia reciente argentina / Gabriela Aguila. Los usos del concepto de ?genocidio? y el problema de la formación de categorías en las disciplinas socio-históricas / Luciano Alonso. La noción de "dictadura cívico-militar" / Marina Franco. Historia reciente ¿una periodización más o una nueva reflexión sobre la historia? / Roberto Pittaluga. Consideraciones sobre los aportes de las Historia Oral / Alessandro Portelli. Sobre el ciclo de la Historia reciente / Alberto Pérez. Definir y nombrar el campo de estudios de la Historia Reciente / Daniel Lvovich. ¿Qué queremos que sea la Historia Reciente? / Roberto Pittaluga.

Annotated record of the detailed examination of Mn deposits from various ship expeditions in the Atlantic Ocean from 1876 until 1911

The greater part of this Monograph is devoted to detailed descriptions of 1426 samples of deposits from the floor of the Atlantic Ocean stored in the Challenger Office, Edinburgh, which had been collected during thirty-five cruising expeditions between 1857 and 1911. The remaining part discusses the results of the work. The work of examining and describing in detail this abundant mass of material was in progress when the late Sir JOHN MURRAY met his death in March 1914. By that time about three-fourths of the descriptive work had been completed under his supervision. Sir John's trustees arranged for the completion of the descriptive work by Mr Chumley, and this was done in the Challenger Office during the two succeeding years. Later, after he had removed to Glasgow, Mr Chumley prepared the notes discussing the results. The trustees have pleasure in recording, on the suggestion of Mr Chumley, the courtesy of Dr G. W. Lee of the Geological Survey of Scotland, for help in determining many of the rarer mineral particles contained in the deposits.