Search results for "LAB"

An experimentalist point of view on quantitative elaboration of theoretical models

1980

Abstract In a number of problems of solute–solute–solvent interaction, information on the geometrical structure of solvent in the near neighborhood of solute is now available. This was obtained from a variety of experiments as well as from numerical calculations. The present trend in computer simulation as well as an experimental techniques seems to appropriately be towards an extension of this information to include thermal disorder. Despite these efforts, other aspects of solute–solute–solvent interaction do not seem likely to find exhaustive answers through a study of the geometrical configurations of solvent molecules around the solute. More detailed calculations of inter- and intra-mol…

Polypyrrole–palladium nanoparticles composite as efficient catalyst for Suzuki–Miyaura coupling

2012

International audience; Synthesis of a new hybrid material (Pd/PPy) composed of polypyrrole globules with uniformly incorporated Pd nanoparticles via direct redox reaction between pyrrole and Pd(NH3)(4)Cl-2 in water has been recently reported (V.A. Zinovyeva, M.A.Vorotyntsev, I. Bezverkhyy, D. Chaumont, J.-C. Hierso, Adv. Funct. Mater. 21 (2011) 1064-1075). In the actual study, this procedure has been extended to synthesize a series of Pd/PPy powders with variable palladium content and morphological parameters. Depending on the monomer-to-oxidant ratio in reaction mixture, average diameters of Pd and PPy particles may change in the ranges of 1.25-1.45 and 27-62 nm, respectively, the Pd conc…

Molecular characterization of a male-specific glycosyl hydrolase, Lma-p72, secreted on to the abdominal surface of the Madeira cockroach Leucophaea m…

2003

0264-6021 (Print) Journal Article Research Support, Non-U.S. Gov't; The epicuticular surface protein Lma-p72 is specific to the abdominal secretions of Leucophaea maderae (Madeira cockroach) adult males. Natural Lma-p72 was purified and the complete cDNA sequence determined by reverse-transcription PCR using primers based on Edman degradation fragments. Northern blot and in situ hybridization analyses showed that Lma-p72 was expressed in the tergal and sternal glands. Sequence alignment indicates that Lma-p72 is closely related to the family 1 glycosyl hydrolases (EC 3.2.1). Native Lma-p72 was proved to be active in the abdominal secretions and exhibit a beta-galactosidase-like activity. Ho…

Neonicotinoids from coated seeds toxic for honeydew-feeding biological control agents

2021

Seed coating (‘seed treatment’) is the leading delivery method of neonicotinoid insecticides in major crops such as soybean, wheat, cotton and maize. However, this prophylactic use of neonicotinoids is widely discussed from the standpoint of environmental costs. Growing soybean plants from neonicotinoid-coated seeds in field, we demonstrate that soybean aphids (Aphis glycines) survived the treatment, and excreted honeydew containing neonicotinoids. Biochemical analyses demonstrated that honeydew excreted by the soybean aphid contained substantial concentrations of neonicotinoids even one month after sowing of the crop. Consuming this honeydew reduced the longevity of two biological control …

Uptake and bioavailability of persistant organic pollutants by plants grown in contaminated soil

2005

This paper assesses the uptake of persistent organic pollutants (POP's) into plants. In particular, uptake of alpha-endosulfan, beta-endosulfan and endosulfan sulfate from lettuce. The lettuce plants were grown on compost that had previously been contaminated at 10 and 50 microg g(-1) per POP. The soil was slurry spiked by adding the appropriate amount of POP in acetone in an approximate ratio of 1 ratio 2, w/v soil ratio solvent. The solvent was left to evaporate at ambient temperature for 24 hours. Lettuce plants were grown under artificial daylight for 12 hours a day. The influence of soil ageing on the recovery of POP's from spiked soil samples was also assessed. The average recovery of…

Didattica e sviluppo delle competenze del Maestro. Docenti e studenti protagonisti in un percorso di ricerca

2010

Il volume affronta il tema dell’integrazione delle lezioni, dei laboratori e del tirocinio nella formazione dei futuri maestri, presentando concrete modalità di interazione tra le esperienze maturate dagli studenti del Corso di Laurea in Scienze della Formazione Primaria durante il percorso universitario. Nel libro sono descritte le modalità con cui durante le ore di lezione, di laboratorio e di tirocinio si è cercato di stimolare la riflessione degli studenti e di aumentare la loro consapevolezza circa i processi attivati nell’apprendimento, le motivazioni sottostanti, le situazioni contingenti e gli aspetti più favorevoli allo sviluppo della competenza professionale del maestro. La ricerc…

Transiciones al mundo del trabajo: La inserción profesional a través del cine

2010

Estudio de las transiciones laborales de los/as jóvenes españoles/as a través de un recorrido por la filmografía reciente.

L’INSINDACABILITÀ FRA EQUILIBRIO DEI POTERI ED UGUAGLIANZA DEI DIRITTI

2010

RESUMEN El Estado italiano ha sido condenado por el Tribunal Europeo de Derechos Humanos por la violación del artículo 6.1 del Convenio, en todos aquellos casos relativos a la prerogativa de la inviolabilidad (insindacabilità) parlamentaria prevista en el artículo 68.1 de la Constitución. Atendiendo al dato apuntado, puede afirmarse que la necesaria garantía del principio de separación de poderes, en tanto que elemento esencial de la “arquitectura constitucional” viene a colisionar con la protección de los derechos fundamentales, al desconocer las exigencias derivadas del principio de proporcionalidad. El caso de la inviolabilidad italiana parece desviarse, por lo que a su aplicación se ref…

Debate: Europa y Estados Unidos en el siglo XXI

2003

Spectral evolution simulation on leading multi-socket, multicore platforms

2011

Spectral evolution simulations based on the observed Very Long Baseline Interferometry (VLBI) radio-maps are of paramount importance to understand the nature of extragalactic objects in astrophysics. This work analyzes the performance and scaling of a spectral evolution algorithm on three leading multi-socket, multi-core architectures. We evaluate three parallel models with different levels of data-sharing: a sharing approach, a privatizing approach and a hybrid approach. Our experiments show that the data-privatizing model is reasonably efficient on medium scale multi-socket, multi-core systems (up to 48 cores) while regardless algorithmic and scheduling optimizations, sharing approach is …