Irreducible Decomposition of Products of 10D Chiral Sigma Matrices

We review the enveloping algebra of the 10 dimensional chiral sigma matrices. To facilitate the computation of the product of several chiral sigma matrices we have developed a symbolic program. Using this program one can reduce the multiplication of the sigma matrices down to linear combinations of irreducilbe elements. We are able to quickly derive several identities that are not restricted to traces. A copy of the program written in the Mathematica language is provided for the community.Comment: 28 pages, Mathematica Program sigmavector10D.nb is included. Submitted ot CP

A Quasi-Adiabatic Reaction Calorimeter for Measurements in Liquids

A quasi adiabatic reaction and solution calorimeter was constructed and tested using tris(hydroxymethyl)aminomethane dissolution in 0.1 mol dm-3 HCl as the reference (standard) process. The precision of the calorimeter amounts to approximately ± 1 per cent and its sensitivity to 4 J dm-a

The effect of lead on the developmental stability of Drosophila subobscura through selection in laboratory conditions

Fluctuating asymmetry (FA), the increased variation of bilateral symmetry in a sample of individuals, can indicate disturbance in developmental stability caused by environmental and/or genomic stress. This developmental instability was analyzed in Drosophila subobscura maintained for seven generations on two different concentrations of lead in laboratory conditions. The FA4 index showed that the genotypes reared on the higher lead concentration were in developmental homeostasis, except for males in the F7 generation, for both wing size parameters. The results show that different degrees of lead pollution cause different responses to selection of the exposed population in laboratory conditions

Inversion polymorphism in populations of Drosophila subobscura from urban and non-urban environments

Populations of Drosophila subobscura from the urban area of Belgrade and from the locality, Deliblato, which is not under strong anthropogenic influence, were studied with the aim to characterize and compare their genetic structure by examining chromosomal inversion polymorphism. Additional analysis and comparison of this type of polymorphism with several other populations from different habitats in the central Balkans, was done. The obtained results indicate higher heterozygosity in the population from Belgrade. Despite being ecologically marginal and under strong and complex influences, this population did not show a decline in the number of inversions and it is not highly differentiated compared to the referent populations.

Self-diffusion of Cd++ Ions in Hydrated CdX Zeolite

The fractional attainment of the isotopic equilibrium between a Cd(N03)2 solution and a 115Cd-labelled CdX zeolite has been measured as a function of time, particle size of zeolite and temperature. The experimental kinetic data have been interpreted in terms of the Brown-Sherry-Krambeck model and the self-diffusivities and diffusional activation parameters of Cd++ ions in zeolite CdX have been calculated

A simple and efficient DNA isolation method for Ornithogalum L. species (Hyacinthaceae, Asparagales)

We report an efficient, simple and cost-effective protocol for the isolation of genomic DNA from Ornithogalum species. Our modification of the standard CTAB protocol includes two polyphenol adsorbents (insoluble PVPP and activated charcoal), high NaCl concentrations (4 M) for removing polysaccharides, and addition of phenol to remove proteins and other contaminants. DNA yield obtained with our protocol was 223 and 312 μg DNA g-1 of dry leaf tissue. The absorbance ratio 260/280 nm was 1.879 (O. refractum) and 1.753 (O. sibthorpii), and the absorbance ratio 260/230 nm was 1.779 (O. refractum) and 1.545 (O. sibthorpii), revealing lack of contamination. PCR amplifications of one nuclear marker (26S rDNA) indicated that this DNA isolation protocol may be used for Ornithogalum plants containing many interfering compounds for further analyses in population genetics and phylogeographic studies

Beam Coupling Impedances of Obstacles Protruding into Beam Pipe

The beam coupling impedances of small obstacles protruding inside the vacuum chamber of an accelerator are calculated analytically at frequencies for which the wavelength is large compared to a typical size of the obstacle. Simple formulas for a few important particular cases, including both essentially three-dimensional objects like a post or a mask and axisymmetric irises, are presented. The analytical results are compared and agree with three-dimensional computer simulations. These results allow simple practical estimates of the broad-band impedance contributions from such discontinuities.Comment: 4 pages, LaTeX (REVTeX), 2 figures (eps); corrected and revised, comparison with simulations added; presented at PAC97 (Vancouver, May 97

Regulation of nitric oxide production in hypothyroidism

Hypothyroidism is a common endocrine disorder that predominantly occurs in females. It is associated with an increased risk of cardiovascular diseases (CVD), but the molecular mechanism is not known. Disturbance in lipid metabolism, the regulation of oxidative stress, and inflammation characterize the progression of subclinical hypothyroidism. The initiation and progression of endothelial dysfunction also exhibit these changes, which is the initial step in developing CVD. Animal and human studies highlight the critical role of nitric oxide (NO) as a reliable biomarker for cardiovascular risk in subclinical and clinical hypothyroidism. In this review, we summarize the recent literature findings associated with NO production by the thyroid hormones in both physiological and pathophysiological conditions. We also discuss the levothyroxine treatment effect on serum NO levels in hypothyroid patients. © 2020 The Author

Spektrofotometrijsko ispitivanje reakcije zlata(III) sa kalijum-jodidom

The equilibria of the complex formation between AuCl4-n(OH)n- and I- was studied spectrophotometrically in aqueous solutions containing KI:Au(III)≤2 in the acidity range from 1 M HCl to pH 7 at 25 ºC. From the hydrogen ion and Cl- ion dependence of the absorption spectra, it was found that AuCl2I2- and Au(OH)2I2- complexes were formed. The equilibrium constants of complex formation were determined.Ravnoteže obrazovanja kompleksa između AuCl4-n(OH)n i KI ispitivane su spektrofotometrijski u vodenim rastvorima pri odnosu koncentracija KI:Au(III) ≤ 2 u oblasti kiselosti od 1 M HCl do pH 7 na 25 ºC. Iz promene apsorpcionih spektara u zavisnosti od kiselosti sredine i koncentracije Cl- jona nađeno je da se obrazuju kompleksi AuCl2I2- i Au(OH)2I2-. Određene su konstante ravnoteže odgovarajućih reakcija. PR Projekat Ministarstva nauke Republike Srbije