1,4-Substituted triazole oligomers made from quaternary amino acid derivatives present a conformational behaviour with similarities to that of natural peptides. Twisted strand and zig-zag type conformations have both been obtained in the crystal state. In a solution signs of weakly ordered structures have been detected depending on the substituents and the solvents used.

A solvothermally derived tetranuclear cobalt(II) complex, [Co(4)(phen)(4)Cl(8)] (phen = phenanthroline), featuring a zig-zag backbone of {Co(μ(2)-Cl)(2)Co} planes, exhibits ferromagnetic exchange and slow relaxation of the magnetization and represents the first Co SMM with a linear core structure.

En este documento se presenta el estudio técnico-económico para la especificación de un transformador Zig-Zag puesta a tierra Central Generación Illuchi I. Partiendo con creación una base datos los parámetros eléctricos elementos que forman parte central, implementa modelo en software Power Factory ejecutan flujos potencia y cortocircuitos, resultados obtenidos analizan mediante script programa...

The synthesis, structural characterization and magnetic properties of a 1D zig-zag coordination polymer based on a cation-cation [(U(V)O2)Mn(II)] repeated unit are reported; it shows single chain magnet (SCM) behaviour with a high energy barrier of 122 K.

BACKGROUND Understanding the factors regulating our microbiota is important but requires appropriate statistical methodology. When comparing two or more populations most existing approaches either discount the underlying compositional structure in the microbiome data or use probability models such as the multinomial and Dirichlet-multinomial distributions, which may impose a correlation structu...

 Abstract Background: Esophageal replacement is indicated in certain circumstances including long gap esophageal atresia, severe strictures due to gastro-esophageal reflux (GER) and caustic burns. We analyzed our results of 18 patients who underwent esophageal replacement in our university hospital. Methods: We reviewed esophageal replacements carried out in our department between June 1996 and...

The Wiener index of a graph G is defined as the sum of all distances between distinct vertices of G. In this paper an algorithm for constructing distance matrix of a zig-zag polyhex nanotube is introduced. As a consequence, the Wiener index of this nanotube is computed.

The compositions, or ordered partitions, of integers, fall under certain natural classes. In this expository paper we highlight the most important classes by means of bijective proofs. Some of the proofs rely on the properties of zig-zag graphs the graphical representations of compositions introduced by Percy A. MacMahon in his classic book Combinatory Analysis.

The crystal structure of an amino-terminal fragment of the clathrin heavy chain has recently been determined, revealing a globular beta-propeller domain attached by an alpha-zig-zag connecting rod to the heavy chain's distal segment. The structure sheds interesting new light on the design features of this versatile protein.

An addition/elimination sequence of selenium halides to pseudo-geminally bis(acetylene) substituted [2.2]paracyclophanes leads to new bridges with an endo-exo-diene substructure. The reactions have been found to be sensitive to the substitution of the ethynyl group. The formation of dienes with a zig-zag configuration is related to that observed for non-conjugated cyclic diynes of medium ring s...