A Study of the Interactions Between the Double Bonds in Unsaturated Ketones

The interactions between C=C and C=O double bonds in several unsaturated ketones have been studied by comparing MIND0/2 caloulations wiith ionisation potentials determined by photoelectron spectroscopy (PES). With one exception (norbornadienone) the direct through-space interactions in conjugated .ketones appear to be negligible, the double bonds couple hyperoonjugatively via the intervening a bonds. This kind of approach should prove useful for studying other long range interactions

Additivity of Bond Energies in the Light of the Maximum Overlap Approximation (MOA) and MIND0/3

Optimum parameters are determined for the use of the maximum overlap approximation (MOA) to calculate heats of atomization of a varied set of eleven hydrocarbons. The agreement with experiment is generally good. The reasons for this success are discussed in terms of an analysis by energy partitioning of MIND0/3 calculations for the same hydrocarbons

Effect of Some Anions on the Chlorate Cell Process

The effect of some non-corresponding ionic species on the anodic process in the chlorate producing electrolytic cells has been investigated. It was shown that increasing concentration of anions such as chromate, nitrate and phosphate results in an increase in the oxygen evolution rate. The effect exhibits an asymptotic tendency at higher concentrations. The resemblance of the curve with the adsorption isotherm suggests anion adsorption and its catalytic effect on charge transfer as a possible cause of increasing electrochemical oxidation of available chlorine. The latter results in a corresponding decrease of the current efficiency of chlorate production. Hence, inspite of the benefitial effect of buffering by some of the anions on the chemical conversion of available chlorine into chlorate, the non-corresponding anion concentrations should be kept as low as possible

Energy consumption in the electrolytic evolution of hydrogen with iron-nickel electrodes

The possibilities to reduce energy consumption in the electrolytic hydrogen production using ionic activators added into an alkaline electrolyte have been investigated. Two cathode/anode systems, Fe/Ni and Ni/Fe were investigated. We have found that some activators, like tris-(ethylenediamine)Co(III) chloride complex in combination with the sodium molybdate can reduce energy needs per mass unit of hydrogen produced for more than ten percent in all investigated systems compared to those of non-activated electrolytes. Additionally, iron exhibits some special properties in this view.Physical chemistry 2004 : 7th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 21-23 September 200

Genetic and epigenomic modifiers of diabetic neuropathy

Diabetic neuropathy (DN), the most common chronic and progressive complication of diabetes mellitus (DM), strongly affects patients’ quality of life. DN could be present as peripheral, autonomous or, clinically also relevant, uremic neuropathy. The etiopathogenesis of DN is multifactorial, and genetic components play a role both in its occurrence and clinical course. A number of gene polymorphisms in candidate genes have been assessed as susceptibility factors for DN, and most of them are linked to mechanisms such as reactive oxygen species production, neurovascular impairments and modified protein glycosylation, as well as immunomodulation and inflammation. Different epigenomic mechanisms such as DNA methylation, histone modifications and non-coding RNA action have been studied in DN, which also underline the importance of “metabolic memory” in DN appearance and progression. In this review, we summarize most of the relevant data in the field of genetics and epigenomics of DN, hoping they will become significant for diagnosis, therapy and prevention of DN

Photoelectron Spectra and Conformational Behaviour of 3-Isopropenylcyclopropene Derivatives

The electronic and molecular structure of a series of 1,2-dialkyl (1-3) and 1,2-diphenyl-3-isopropenylcyclopropene (4) have been investigated by means of He(I) photoelectron spectroscopy and ab initio MO calculations. The changes in the lowest energy ionization along the series are interpreted in terms of conformotionally dependent conjugative interaction between the isopropenyl group and cyclopropenyl ring

Environmental Education in Serbian Primary Schools: Challenges and Changes in Curriculum, Pedagogy, and Teacher Training

The protection of human health and the preservation of the environment are topics that form anintegral part of the primary school curriculum in Serbia. However, research studies have shown thatstudents do not have enough knowledge to contribute to the development of a healthy lifestyle andenvironmental awareness. The latest changes in school policy and curricula confirm that the relevanceof environmental education has been recognized, but changes in school practice are yet to come. Thisarticle discusses the challenges encountered in the implementation of the intended curriculum andoffers suggestions for changes to the curriculum, pedagogy, and teacher training in order to enhanceenvironmental educationThis is the peer-reviewd version of the artivle: Stanišić, Jelena, и Slavica Maksić. 2014. „Environmental Education in Serbian Primary Schools: Challenges and Changes in Curriculum, Pedagogy, and Teacher Training“. Journal of Environmental Education 45(2):118–31. doi: 10.1080/00958964.2013.829019.Related to published version: [ http://ipir.ipisr.org.rs/handle/123456789/240

Clar's Theory, STM Images, and Geometry of Graphene Nanoribbons

We show that Clar's theory of the aromatic sextet is a simple and powerful tool to predict the stability, the \pi-electron distribution, the geometry, the electronic/magnetic structure of graphene nanoribbons with different hydrogen edge terminations. We use density functional theory to obtain the equilibrium atomic positions, simulated scanning tunneling microscopy (STM) images, edge energies, band gaps, and edge-induced strains of graphene ribbons that we analyze in terms of Clar formulas. Based on their Clar representation, we propose a classification scheme for graphene ribbons that groups configurations with similar bond length alternations, STM patterns, and Raman spectra. Our simulations show how STM images and Raman spectra can be used to identify the type of edge termination