Search results for "TAXA"

CCDC 1575262: Experimental Crystal Structure Determination

2018

Related Article: Yan-Long Ma, Hua Ke, Arto Valkonen, Kari Rissanen, Wei Jiang|2018|Angew.Chem.,Int.Ed.|57|709|doi:10.1002/anie.201711077

Dual-stimuli pseudorotaxane switches under kinetic control

2021

A series of dumbbell-shaped sec-ammonium salts with bulky (pseudo)stoppers (‘speed bumps’) were tested for their ability to form pseudorotaxanes with a redox-switchable, tetrathiafulvalene (TTF)-decorated [24]crown-8 ether. Depending on the size of the pseudostoppers, fast (less than ten minutes), slow (hours to days) and very slow (no pseudorotaxanes observed) threading has been observed. NMR spectroscopy as well as tandem mass spectrometry indicate the formation of non-threaded face-to-face complexes prior to pseudorotaxanes formation. Both isomers can be distinguished by their substantially different stability in collision-induced dissociation (CID) experiments. Two external stimuli affe…

Photocontrolled On-Surface Pseudorotaxane Formation with Well-Ordered Macrocycle Multilayers.

2016

The photoinduced pseudorotaxane formation between a photoresponsive axle and a tetralactam macrocycle was investigated in solution and on glass surfaces with immobilized multilayers of macrocycles. In the course of this reaction, a novel photoswitchable binding station with azobenzene as the photoswitchable unit and diketopiperazine as the binding station was synthesized and studied by NMR and UV/Vis spectroscopy. Glass surfaces have been functionalized with pyridine-terminated SAMs and subsequently with multilayers of macrocycles through layer-by-layer self assembly. A preferred orientation of the macrocycles could be confirmed by NEXAFS spectroscopy. The photocontrolled deposition of the …

Short implants (8mm) versus longer implants (≥8mm) with lateral sinus floor augmentation in posterior atrophic maxilla: A meta-analysis of RCT`s in h…

2019

Background One of the greatest challenges that dentists face today is to rehabilitate severe atrophied alveolar ridges in partially and completely edentulous patients with implants. Despite the high survival rate of implants placed next to sinus elevation, this technique presents complications that can be avoided by placing short implants, an option that also presents high survival rates. For this reason, the aim of this study is to compare the survival rate, marginal bone loss and complications associated with short implants (<8 mm) versus longer implants (≥8mm) placed with lateral sinus floor elevation in posterior atrophic maxillae. Material and Methods A literature search was conducted …

Magnus Henrekson and Mikael Stenkula, eds., Swedish taxation: developments since 1862 (New York: Palgrave Macmillan, 2015. Pp. 334. ISBN 978113747814…

2017

Genome-based analyses reveal a synonymy among Halorubrum distributum Zvyagintseva and Tarasov 1989; Oren and Ventosa 1996, Halorubrum terrestre Vento…

2020

A comparative taxonomic study of Halorubrum distributum , Halorubrum terrestre , Halorubrum arcis and Halorubrum litoreum was carried out using different approaches, 16S rRNA gene sequence analysis, multilocus sequence analysis (MLSA), phylogenomic analysis based on the comparison of the core genome, orthologous average nucleotide identity (OrthoANI), Genome-to-Genome Distance Calculator (GGDC), synteny plots and polar lipid profile (PLP). The MLSA study, using the five concatenated housekeeping genes atpB, EF-2, glnA, ppsA and rpoB′, and the phylogenomic analysis based on 1347 core translated gene sequences obtained from their genomes showed that Halorubrum distributum JCM 9100T, Halorubru…

Names for trace fossils: a uniform approach.

2006

The taxonomic treatment of trace fossils needs a uniform approach, independent of the ethologic groups concerned. To this aim, trace fossils are rigorously defined with regard to biological taxa and physical sedimentary structures. Potential ichnotaxobases are evaluated, with morphology resulting as the most important criterion. For trace fossils related to bioerosion and herbivory, substrate plays a key role, as well as composition for coprolites. Size, producer, age, facies and preservation are rejected as ichnotaxobases. Separate names for undertracks and other poorly preserved material should gradually be replaced by ichnotaxa based on well-preserved specimens. Recent traces may be iden…

A Strategic Management Approach to the Problems of EU taxation

2004

This paper adopts a strategic management approach (objectives, strategy, structure, control) to the study of the European Union's taxation problems. Union of States have some strengths vis-a-vis individual States. However, to ensure that all States benefit, they need constant redistribution. As opposed to fiscal problems of unitary states, Unions of States have additional problems related to their differentiated organizational form, and hence they need integrating control mechanisms. This paper studies the EU taxation in view of the above notions common to the literature on fiscal federalism. We find that a strategic management approach can be applied to highlight the problems of taxation i…

Tax Performance Assessment in Scandinavian Countries

2015

Abstract The aim of this paper is to evaluate fiscal policy performance level in Nordic countries of Europe by quantifying the gap between their performance and an optimum benchmark value. In this study it was selected Denmark, Finland, Sweden and Norway. These countries occupy the first places in the ranking of countries with the highest rate of tax burden in Europe. The first part of paper contains general aspects of fiscal performance in international research and an overview of the Nordic tax systems model. The second part of paper focuses on evaluation of tax policy performance in these countries by using OptimTax scoring analysis. The research is based on a multivariate analysis instr…

Indicadors de Dinàmica

2019

Conjunt de fulls de càlcul dissenyats amb Microsoft Excel (versió 2003) que permeten calcular, per a diferents zones geogràfiques, els principals indicadors de dinámica de la població. Les dades necessàries per a aquest càlcul són: •Data de referència dels registres de població •Població en les zones geogràfiques estudiades