The Comparison Between Measured and Calculated Values of Gamma Ray Absorption on Lead Nitrate Solutions

The method of conc entration determination of l ead nitrate solutions in the concentration range up to 20 grams per 100 ml by g amma rays absorption measurements was described. GOCo and 1s1 cs were used as gamma r ay sources. The gamma ray intensities were measured using a sc intillation co unter. Using a simple equation for the absorption of gamma rays , the equation which contains the directly measured values only, was developed. Using that equation the absorption for all used concentrations was calcula ted . The agreem ent between measured and calculate d values is fairly well. The possible reason of obtained dis ag reement is discussed

The Comparison Between Measured and Calculated Values of Gamma Ray Absorption on Lead Nitrate Solutions

The method of conc entration determination of l ead nitrate solutions in the concentration range up to 20 grams per 100 ml by g amma rays absorption measurements was described. GOCo and 1s1 cs were used as gamma r ay sources. The gamma ray intensities were measured using a sc intillation co unter. Using a simple equation for the absorption of gamma rays , the equation which contains the directly measured values only, was developed. Using that equation the absorption for all used concentrations was calcula ted . The agreem ent between measured and calculate d values is fairly well. The possible reason of obtained dis ag reement is discussed

Study of the local field distribution on a single-molecule magnet-by a single paramagnetic crystal; a DPPH crystal on the surface of an Mn12-acetate crystal

The local magnetic field distribution on the subsurface of a single-molecule magnet crystal, SMM, above blocking temperature (T >> Tb) detected for a very short time interval (~ 10-10 s), has been investigated. Electron Paramagnetic Resonance (EPR) spectroscopy using a local paramagnetic probe was employed as a simple alternative detection method. An SMM crystal of [Mn12O12(CH3COO)16(H2O)4].2CH3COOH.4H2O (Mn12-acetate) and a crystal of 2,2- diphenyl-1-picrylhydrazyl (DPPH) as the paramagnetic probe were chosen for this study. The EPR spectra of DPPH deposited on Mn12-acetate show additional broadening and shifting in the magnetic field in comparison to the spectra of the DPPH in the absence of the SMM crystal. The additional broadening of the DPPH linewidth was considered in terms of the two dominant electron spin interactions (dipolar and exchange) and the local magnetic field distribution on the crystal surface. The temperature dependence of the linewidth of the Gaussian distribution of local fields at the SMM surface was extrapolated for the low temperature interval (70-5 K)

O određivanju olova merkaptobenztiazolom u nazočnosti barija

U nazocnosti tamponske smjese NH40H + NH4N03 moguce je talozenjem merkaptobenztiazolom odrediti olovo i uz stostruku kolicinu barija. Temperatura pri filtraciji taloga ne utjece na rezultate, kao sto na njih ne utjece ni razrjedenje otopine na deseterostruki volumen

O određivanju olova merkaptobenztiazolom u nazočnosti barija

U nazocnosti tamponske smjese NH40H + NH4N03 moguce je talozenjem merkaptobenztiazolom odrediti olovo i uz stostruku kolicinu barija. Temperatura pri filtraciji taloga ne utjece na rezultate, kao sto na njih ne utjece ni razrjedenje otopine na deseterostruki volumen

Genotype x Environment interaction for antioxidants and phytic acid contents in bread and durum wheat as influenced by climate

Antioxidants prevent oxidative stress and exert positive health effects. However, phytic acid among them decreases micronutrients absorption, representing also antinutrient to human and non-ruminant animals. Fifteen bread wheat (Triticum aestivum L.) and 15 durum wheat (Triticum durum Desf.) genotypes were evaluated across six environments to determine contents of phytic acid (PA), inorganic P (Pi), total yellow pigment, total soluble phenolic compounds, free protein sulfhydryl groups (PSH), and also phytic acid P/P-i (P-p/P-i). The objective of this study was to quantify, for each trait the effects of environment, genotype, and their interaction; and the influence of climatic factors on the Genotype x Environment interaction (GEI) by the use of the factorial regression. GEI (P lt 0.001) prevailed as source of variation over genotype (P lt 0.001) in determining PA content in bread and durum wheat (44.3% and 34.7% of sum of squares-SS, respectively), PSH content in bread and durum wheat (27% and 28.4% of SS, respectively) and total soluble phenolic compounds content in durum wheat (35.5% of SS). The major contribution to the GEI represented climatic variables during stages of stem elongation for PA and phenolic compounds, and also flowering, fertilization, grain formation and grain filling for PSH. Total yellow pigment and Pi contents in bread and durum wheat were predominantly determined by genotype (P lt 0.001). Models of climatic variables proved to be efficient in the explanation of more than 92% of the SS of GEI for PA and antioxidants contents