Search results for "ATRA"

Molecular precursors of mesostructured silica materials in the atrane route: A DFT/GIAO/NBO theoretical study

2007

Abstract Quantum chemical calculations using density functional theory have been carried out to investigate two assumed molecular precursors and identified as silatranes (N[OCH2CH2]3Si–OCH2CH2N–(CH2CH2OH)2 and N[OCH2CH2]3Si–OCH2CH2N–(CH2CH2OH)2Na+) which are present in the synthesis of mesoporous silica based material namely “the atrane route”. One of the ways in this synthesis leads to the well-known MCM-41. Additionally, in this work has been also investigated two others molecules such as triethanolamine (TEAH3) and sodatrane which are present in the medium. Gas phase and solution equilibrium geometries of the previous molecules were fully optimized at B3LYP level, modeling solvent effect…

Lichen microalgae are sensitive to environmental concentrations of atrazine

2017

The identification of new organisms for environmental toxicology bioassays is currently a priority, since these tools are strongly limited by the ecological relevance of taxa used to study global change. Lichens are sensitive bioindicators of air quality and their microalgae are an untapped source for new low-cost miniaturized bioassays with ecological importance. In order to increase the availability of a wider range of taxa for bioassays, the sensitivity of two symbiotic lichen microalgae, Asterochloris erici and Trebouxia sp. TR9, to atrazine was evaluated. To achieve this goal, axenic cultures of these phycobionts in suspension were exposed to a range of environmental concentrations of …

Contribution to the flora of Asian and European countries : new national and regional vascular plant records, 9

2020

The paper presents new records for 39 vascular plant species from eight Eurasian countries. Aniselytron treutleri Poaceae , Hackelochloa granularis Poaceae , Melica kozlovii Poaceae and Melica nutans Poaceae are reported from China; Dichondra micrantha Convolvulaceae from Hungary; Orobanche serbica Orobanchaceae and Viscum album subsp. austriacum Santalaceae from Italy; Petrorhagia prolifera Caryophyllaceae , Puccinellia schischkinii and Stipa pulcherrima Poaceae from Kyrgyzstan; Megadenia speluncarum Brassicaceae , Phelipanche lavandulacea Orobanchaceae , Solanum physalifolium Solanaceae , Thymus lenensis Lamiaceae from Russia; Rubus phoenicolasius Rosaceae from Slovakia; Atraphaxis karata…

Univariate method for background correction in liquid chromatography–Fourier transform infrared spectrometry

2007

An univariate method is proposed for background correction in on-line gradient liquid chromatography-Fourier transform infrared (LC-FTIR) spectrometry using acetonitrile:water as mobile phase components. The method is based on the calculation of the ratio of absorbances (AR) at two characteristic wavenumbers for each spectrum. This parameter is subsequently used to locate the most appropriated eluent spectrum within a reference spectra matrix (RSM) to be subtracted from each spectrum included in the sample chromatogram. To correct minor changes in eluent spectra intensity during the elution of analytes, a correction factor (Kf), defined as the ratio of the absorbance of the sample and the s…

Nanoparticulated Silicas with Bimodal Porosity: Chemical Control of the Pore Sizes

2008

Nanoparticulated bimodal porous silicas (NBSs) with pore systems structured at two length scales (meso- and large-meso-/macropores) have been prepared through a one-pot surfactant-assisted procedure by using a simple template agent and starting from silicon atrane complexes as hydrolytic inorganic precursors. The final bulk materials are constructed by an aggregation of pseudospherical mesoporous primary nanoparticles process, over the course of which the interparticle (textural) large pore system is generated. A fine-tuning of the procedural variables allows not only an adjustment of the processes of nucleation and growth of the primary nanoparticles but also a modulation of their subseque…

Novel atrazine-binding biomimetics inspired to the D1 protein from the photosystem II of Chlamydomonas reinhardtii.

2020

Biomimetic design represents an emerging field for improving knowledge of natural molecules, as well as to project novel artificial tools with specific functions for biosensing. Effective strategies have been exploited to design artificial bioreceptors, taking inspiration from complex supramolecular assemblies. Among them, size-minimization strategy sounds promising to provide bioreceptors with tuned sensitivity, stability, and selectivity, through the ad hoc manipulation of chemical species at the molecular scale. Herein, a novel biomimetic peptide enabling herbicide binding was designed bioinspired to the D1 protein of the Photosystem II of the green alga Chlamydomonas reinhardtii. The D1…

Cigne negre, Cisne negro (VER0000229)

Black Swan (Anglès), Cygne noir (Francès), Schwarzschwan (Alemany) Gabinet de Vertebrats (Departament de Zoologia), Facultat de Ciències Biològiques (Campus de Burjassot), C/ Doctor Moliner, s/n, Bloque B. 5é plant, Burjassot (Valencia). Armari: 12-2

Eleonora Duse as Juliet and Cleopatra

2017

From her debut as Juliet in 1872 onwards, the career of Eleonora Duse (1858–1924) is marked by an evolving, changeable approach to her Shakespearean roles. In different ways and under diverse circumstances, each of her Shakespearean parts represented something of a turning-point in her cursus. Scholars have argued that life and art, emotional instinct and theatrical performance, coalesced seamlessly throughout her Shakespearean repertoire, and in particular in her interpretation of Cleopatra (Puppa 2009). Yet while this theory that she acted out her own personal life, and that her characters’ feelings coincided with her own, is an attractive one, it is also reductive. New evidence——the disc…

Measuring Strategies of the Field Experiments CLEOPATRA, FELDEX and NORDEX of the Collaborative Research Centre

2007

Pelicà, Pelícano común (VER0000063)

Altres noms vulgars: Great white pelican (Anglès), Pélican blanc (Francès), Rosapelikan (Alemany) Gabinet de Vertebrats (Departament de Zoologia), Facultat de Ciències Biològiques (Campus de Burjassot), C/ Doctor Moliner, s/n, Bloque B. 5é plant, Burjassot (Valencia). Armari: 5-2 Valencia Macho