Search results for "Fig"

Revision of Na 2 A1Σ+u state molecular constants by polarization labeling spectroscopy

1997

ABSTRACT. This paper contains the analysis of the A1 of Na2 based on the data obtained from thepolarization labeling spectroscopy experiment on the A' —X' transition. A set of Dunham coefficients is derived, which describes the A state in the wide range of v and J 126) quantum numbers and reproduces the positions of unperturbed rotational lines in the A-X band system towithinO.1 cm'.1. INTRODUCTION.We report' new analysis of the A' state based on the data obtained from polarization labelingspectroscopy (PLS) experiment"2, based on V-type optical—optical double resonance scheme, on the 1 : ' ; band system of sodium dimer. The diatomic alkali molecules, with their simple electronic configurat…

ChemInform Abstract: Two-Carbon Bridge Substituted Cocaines: Enantioselective Synthesis, Attribution of the Absolute Configuration, and Biological Ac…

2010

In an effort to learn more about the general structure-activity relationships of cocaine with the aim to elucidate those structural features that might confer antagonistic properties to such analogues, we describe herein our synthetic efforts to prepare two-carbon bridge functionalized (methoxylated and hydroxylated) analogues. Our approach makes use of a modification of the classical Willstatter synthesis of cocaine: Mannich type cyclization of acetonedicarboxylic acid monomethyl ester with methylamine hydrochloride and 2-methoxysuccindialdehyde in a citrate buffer solution afforded the 6- and 7-substituted 2-carbomethoxy-3-tropinones 3a,b and 4a,b in approximate yields of 64%. Reduction o…

Struktur-Wirkungs-Beziehungen bei Histaminanaloga, 22. Mitt. Absolute Konfiguration und histaminartige Wirkung der enantiomeren α, Nα-Dimethylhistami…

1980

Es werden die Synthesen der enantiomeren α, Nα-Dimethylhistamine (+)—3 und (−)—3, die Ableitung der absoluten Konfiguration sowie die histaminartige Wirksamkeit der Enantiomere am Ileum (H1) und Atrium (H2) des Meerschweinchens beschrieben. Structure-Activity Relationship of Histamine Analogues. XXII: Absolute Configuration and Histamine-like Activity of the Enantiomeric α, Nα-Dimethylhistamines The synthesis of the enantiomeric α, Nα-Dimethylhistamines (+)—3 and (−)—3, the determination of the absolute configuration and the histamine-like activity of the enantiomers on the guinea-pig ileum (H1) and atrium (H2) are reported.

Struktur-Wirkungs-Beziehungen bei Histaminanaloga, 23. Mitt. Absolute Konfiguration und histaminartige Wirkung der enantiomeren α-Chlormethylhistamin…

1981

Es wird die histaminartige Wirksamkeit der enantiomeren α-Chlormethylhistamine (+)-2a und (−)-2a sowie der Nα-Methyl-α-chlormethylhistamine (+)-2b und (−)-2b am Ileum (H1) und Atrium (H2) des Meerschweinchens beschrieben und die absolute Konfiguration der Enantiomere abgeleitet. Structure-Activity Relationships of Histamine Analogues, XXIII: Absolute Configuration and Histamine-like Activity of the Enantiomeric α-Chloromethylhistamines and Nα-Methyl-α-chloromethylhistamines The histamine-like activities of the enantiomeric α-chloromethylhistamines (+)-2a and (−)-2a and of the Nα-methyl-α-chloromethylhistamines (+)-2b and (−)-2b on the guinea pig ileum (H1) and atrium (H2) are reported. The …

Towards a converged barrier height for the entrance channel transition state of the N(2D)+CH4 reaction and its implication for the chemistry in Titan…

2011

Abstract The N( 2 D) + CH 4 reaction appears to be a key reaction for the chemistry of Titan’s atmosphere, opening the door to nitrile formation as recently observed by the Cassini–Huygens mission. Faced to the controversy concerning the existence or not of a potential barrier for this reaction, we have carried out accurate ab initio calculations by means of multi-state multi-reference configuration interaction (MS-MR-SDCI) method. These calculations have been partially corrected for the size-consistency errors (SCE) by Davidson, Pople or AQCC corrections. We suggest a barrier height of 3.86 ± 0.84 kJ/mol, including ZPE, for the entrance transition state, in good agreement with the experime…

Sport e integrazione sociale. Il c.d. ius soli sportivo

2018

L'articolo esamina criticamente la disciplina di cui alla Legge 20 gennaio 2016, n. 12, che ha introdotto in Italia l'istituto comunemente denominato ius soli sportivo. L'analisi è condotta prendendo a riferimento sia la normativa di fonte statuale che quella di fonte federale, nazionale e internazionale.

Il ruolo dei nonni nel processo di cogenitorialità

2012

Qui dit Noël dit cadeaux: critical reading of an article by Kentaro Koga (2020)

2022

While noting the significant peculiarities of the construction Qui dit Noël dit cadeau, Kentaro Koga has launched a series of research on all the infrastructures of this construction, with the aim of revealing their internal organization and identifying their possible lexical and syntactic variations. This article – « Qui dit Noël dit cadeau : modèle, variation et idées conventionnelles » – by Kentaro Koga, established from his own collection of linguistic data, studies the uses of the construction qui dit X dit Y in the French nowadays. Nevertheless, it seems that his conclusions are more or less arbitrary, which il the reason why we will re-examine this construction from other hermeneutic…

Modèle des voies réflexes et cérébelleuses, permettant le calcul de fonctions inverses et la commande d'un segment mécanique mobile

2004

14/07/2004; La commande et le contrôle des mouvements des membres par les voies cérébelleuses et réflexes sont modélisées au moyen d'un circuit dont la structure est déduite de contraintes fonctionnelles. 1/ La première contrainte est que les mouvements rapides des membres doivent être précis, quoiqu'ils ne puissent pas être commandés en boucle fermée au moyen de signaux sensoriels. Les voies qui préparent les ordres moteurs doivent donc contenir des fonctions inverses approximées des fonctions biomécaniques du membre et des muscles. Or une telle fonction peut être calculée au moyen de boucles de rétroaction parallèles, dont la structure est comparable à l'anatomie des voies cérébelleuses. …

L’esthésique et l’épiphanique

2016

Le discours gastronomique prend une place toujours plus grande dans la société et se repose plus que jamais sur l’image pour communiquer sur la cuisine, le goût, l’émotion gastronomique. Au cœur de ce discours, la saveur et les sensations gustatives. Les sciences expérimentales ne définissent pas autrement le goût, mais les sciences humaines n’hésitent pas à donner une définition extensive du goût, dans toute son amplitude figurative. Pour autant, la saveur constitue le point d’origine et l’essence du goût et, à travers tous les possibles de communication, l’image se heurte à une problématique foncière : comment figurer la saveur ? Nous faisons l’hypothèse qu’il faut d’abord penser le cadre…