Different hydrogen-bonded chains in the crystal structures of three alkyl N-[(E )-1-(2-benzylidene-1-methylhydrazinyl)-3- hydroxy-1-oxopropan-2-yl]carbamates

Peer reviewedPublisher PD

Different packing motifs of isomeric (E)-N1-(halophenylmethylidene)-N-methyl-2-(thiophen-2-yl)-acetohydrazides controlled by C—HO interactions

We thank the EPSRC National Crystallography Service (University of Southampton) for the X-ray data collectionsPeer reviewedPublisher PD

2-[(E)-2-(3,4-Dichlorobenzylidene)hydrazin-1-yl]quinoxaline

The use of the EPSRC X-ray crystallographic service (Coles & Gale, 2012[Coles, S. J. & Gale, P. A. (2012). Chem. Sci, 3, 683-689.]) at the University of Southampton, England, and the valuable assistance of the staff there is gratefully acknowledged. JLW acknowledges support from CAPES (Brazil). Structural studies are supported by the Ministry of Higher Education (Malaysia) and the University of Malaya through the High-Impact Research scheme (UM.C/HIR/MOHE/SC/3).Peer reviewedPublisher PD

Different weak interactions in the crystals of three isomeric (E)-N-methyl-N0-(nitrobenzylidene)- 2-(thiophen-2-yl)acetohydrazides

We thank the EPSRC National Crystallography Service (University of Southampton) for X-ray data collection.Peer reviewedPublisher PD

N′-[(1E)-(5-Nitrofuran-2-yl)methylidene]thiophene-2-carbohydrazide: crystal structure and Hirshfeld surface analysis

In the title carbohydrazide, C10H7N3O4S, the dihedral angle between the terminal five-membered rings is 27.4 (2)°, with these lying to the same side of the plane through the central CN2C(=O) atoms (r.m.s. deviation = 0.0403 Å), leading to a curved mol­ecule. The conformation about the C=N imine bond [1.281 (5) Å] is E, and the carbonyl O and amide H atoms are anti. In the crystal, N-H...O hydrogen bonds lead to supra­molecular chains, generated by a 41 screw-axis along the c direction. A three-dimensional architecture is consolidated by thienyl-C-H...O(nitro) and furanyl-C-H...O(nitro) inter­actions, as well as [pi]-[pi] inter­actions between the thienyl and furanyl rings [inter-centroid distance = 3.515 (2) Å]. These, and other, weak inter­molecular inter­actions, e.g. nitro-N-O...[pi](thien­yl), have been investigated by Hirshfeld surface analysis, which confirms the dominance of the conventional N-H...O hydrogen bonding to the overall mol­ecular packing

Climate change and its impacts on Brazilian amphibians

A alteração das condições climáticas do planeta terá consequências diretas sobre animais ectotérmicos tais como os anfíbios. Neste estudo, realizamos um exercício de modelagem correlativa baseada em nicho climático para prever mudanças na distribuição de alguns anfíbios dos principais biomas brasileiros, assim como uma espécie de ampla distribuição (Eupemphix nattereri), face às alterações climáticas esperadas para os próximos 90 anos. Apresentamos e discutimos observações que revelam outras formas de influência do aquecimento global sobre o sucesso reprodutivo, qualidade de micro-hábitats, e interações entre anfíbios e seus patógenos.Global climate change is expected to strongly affect ectotherms species such as amphibians. Based on climate-based correlative models of species distribution, we predict range shifts in some of the main Brazilian biomes, as well as in a widely distributed species (Eupemphix nattereri), assuming climatic projections for the next 90 years. We also present and discuss observations that reveal other ways in which global warming can impact amphibian recruitment success, microhabitat quality, and host-pathogen interactions

Measurement of XUV-absorption spectra of ZnS radiatively heated foils

Time-resolved absorption of zinc sulfide (ZnS) and aluminum in the XUV-range has been measured. Thin foils in conditions close to local thermodynamic equilibrium were heated by radiation from laser-irradiated gold spherical cavities. Analysis of the aluminum foil radiative hydrodynamic expansion, based on the detailed atomic calculations of its absorption spectra, showed that the cavity emitted flux that heated the absorption foils corresponds to a radiation temperature in the range 55 60 eV. Comparison of the ZnS absorption spectra with calculations based on a superconfiguration approach identified the presence of species Zn6+ - Zn8+ and S5+ - S6+. Based on the validation of the radiative source simulations, experimental spectra were then compared to calculations performed by post-processing the radiative hydrodynamic simulations of ZnS. Satisfying agreement is found when temperature gradients are accounted for

Benefits in cardiac function by CD38 suppression: Improvement in NAD+ levels, exercise capacity, heart rate variability and protection against catecholamine-induced ventricular arrhythmias

CD38 enzymatic activity regulates NAD+ and cADPR levels in mammalian tissues, and therefore has a prominent role in cellular metabolism and calcium homeostasis. Consequently, it is reasonable to hypothesize about its involvement in cardiovascular physiology as well as in heart related pathological conditions. Aim: To investigate the role of CD38 in cardiovascular performance, and its involvement in cardiac electrophysiology and calcium-handling. Methods and results: When submitted to a treadmill exhaustion test, a way of evaluating cardiovascular performance, adult male CD38KO mice showed better exercise capacity. This benefit was also obtained in genetically modified mice with catalytically inactive (CI) CD38 and in WT mice treated with antibody 68 (Ab68) which blocks CD38 activity. Hearts from these 3 groups (CD38KO, CD38CI and Ab68) showed increased NAD+ levels. When CD38KO mice were treated with FK866 which inhibits NAD+ biosynthesis, exercise capacity as well as NAD+ in heart tissue decreased to WT levels. Electrocardiograms of conscious unrestrained CD38KO and CD38CI mice showed lower basal heart rates and higher heart rate variability than WT mice. Although inactivation of CD38 in mice resulted in increased SERCA2a expression in the heart, the frequency of spontaneous calcium release from the sarcoplasmic reticulum under stressful conditions (high extracellular calcium concentration) was lower in CD38KO ventricular myocytes. When mice were challenged with caffeine-epinephrine, CD38KO mice had a lower incidence of bidirectional ventricular tachycardia when compared to WT ones. Conclusion: CD38 inhibition improves exercise performance by regulating NAD+ homeostasis. CD38 is involved in cardiovascular function since its genetic ablation decreases basal heart rate, increases heart rate variability and alters calcium handling in a way that protects mice from developing catecholamine induced ventricular arrhythmias.Fil: Agorrody, Guillermo. Universidad de la Republica. Facultad de Medicina; UruguayFil: Peclat, Thais R.. Mayo Clinic College Of Medicine; Estados UnidosFil: Peluso, Gonzalo. Universidad de la Republica. Facultad de Medicina; UruguayFil: Gonano, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Cardiovasculares "Dr. Horacio Eugenio Cingolani". Universidad Nacional de La Plata. Facultad de Ciencias Médicas. Centro de Investigaciones Cardiovasculares "Dr. Horacio Eugenio Cingolani"; ArgentinaFil: Santos, Leonardo. Instituto Pasteur de Montevideo; UruguayFil: van Schooten, Wim. Teneobio; Estados UnidosFil: Chini, Claudia C. S.. Mayo Clinic College Of Medicine; Estados UnidosFil: Escande, Carlos. Instituto Pasteur de Montevideo; UruguayFil: Chini, Eduardo N.. Mayo Clinic College Of Medicine; Estados UnidosFil: Contreras, Paola. Universidad de la Republica. Facultad de Medicina; Urugua