Determination of vegetal proteins in milk powder by sodium dodecyl sulfate-capillary gel electrophoresis: interlaboratory study

An interlaboratory study, with the participation of 8 laboratories, was conducted to evaluate a sodium dodecyl sulfate-capillary gel electrophoresis method for determination of adulteration of milk powder with soy and pea proteins. Calibration standards (0-8%, w/w, soy and pea protein in total protein) and adulterated skim milk powders (0-5%, w/w, soy and pea proteins in total protein) were produced. Vegetal proteins were determined after removal of milk proteins by pretreatment of the samples with tetraborate-EDTA buffer, pH 8.3. Repeatability standard deviations ranged from 9 to 15% and reproducibility standard deviations ranged from 25 to 30% in the samples containing 5% vegetal protein in total protein.     

Alkali metal oxides: Occupied,unoccupied and excited states

The occupied and unoccupied electronic states of NaO₂ and KO₂ have been investigated by UV photoemission spectroscopy and inverse photoemission spectroscopy, respectively. In addition single electron excitations from occupied into empty levels have been probed by x-ray absorption and electron energy loss spectroscopy. The experimental data are augmented by LCGTO-X model cluster calculations. A detailed assignment of initial and final states is given. The excitation cross sections and an inversion of the ligand field induced3d level splitting in NaO₂ are discussed.     

Synthesis and vibrational circular dichroism of enantiopure chiral oxorhenium(V) complexes containing the hydrotris(1-pyrazolyl)borate ligand

The infrared and vibrational circular dichroism (VCD) spectra of six chiral oxorhenium(V) complexes, bearing a hydrotris(1-pyrazolyl)borate (Tp) ligand, have been investigated. These complexes are promising candidates for observation of parity violation (symmetry breaking due to the weak nuclear force). New chiral oxorhenium complexes have been synthesized, namely, [TpReO(eta2-O(CH3)CH2CH2O-O,O)] (4a and 4b) diastereomers and [TpReO(eta2-N(CH3)CH2CH2O-N,O)] (5) and [TpReO(eta2-N(tBu)CH2CH2O-N,O)] (6) enantiomers. All compounds could be obtained in enantiomerically pure form by using either column chromatography or HPLC over chiral columns. VCD spectroscopy of these compounds and of [TpReO(eta2-N(CH3)CH(CH3)CH(Ph)O-N,O)] (2) and [TpReO(eta2-N(CH2)3CHCO2-N,O)] (3) (with chiral bidentate ligands derived, respectively, from ephedrine and proline) were studied. This allowed the absolute configuration determination of all compounds together with their conformational analysis, by comparing calculated and experimental spectra. This is the first VCD study of rhenium complexes which further demonstrates the applicability of VCD spectroscopy in determining the chirality of inorganic complexes.     

Verfolgung der Verbrennungsreaktionen exothermer Massen auf Basis von Aluminium,Fluoriden und Kaliumnitrat mit Differentialthermoanalyse

DTA was applied to investigate the course of combustion of exothermic mixtures composed of aluminium, fluorides and potassium nitrate, and the results obtained were compared with the simultaneous results of X-ray investigations. The combustion of exothermic mixtures composed of aluminium, fluorides and potassium nitrate is similar to the combustion of mixtures where the potassium nitrate is substituted by sodium nitrate. Two exothermic reactions occur: between 400 and 520?, and between 800 and 1130?, in mixtures with sodium fluoride and between 450? and 650? and 850 and 1130? in mixtures with calcium fluoride. The reaction in the lower temperature range initiates the combustion of the mixture. In sodium fluoride mixtures this reaction takes place at lower temperature and seems to be more intense, since these mixtures inflame earlier than those with calcium fluoride. The reaction in the higher temperature range, which occurs at approximately the same temperature in the two cases, liberates the main part of the useful heat of the exothermic mixtures.     

The controversy in the γγ → ρρ process: potential scattering or qqq̄q̄ resonance?

The γγ → gr⁰ ρ⁰ → 4π reaction shows a broad peak at 1.5 GeV in the (J ^P, J_z)=(2⁺, 2) channel which has no counterpart in the ρ⁺ ρ^? channel. This “resonance” is considered as a candidate for a qqq?q? state in the “s-channel”. We show, however, that it can also be explained by potential scattering of ρ⁰ ρ⁰ via the σ-exchange in the “t-channel”.     

Dibaryon resonances with retarded decay

The nonstrange resonances which cannot decay in the NN, NΔ or ΔΔ channels or which can decay in these channels only with the $\text{ls}$ and tensor quark-quark interaction, are presented in the nonrelativistiv quark model with six quarks grouped in two clusters. The GCM calculation gives energies of 3203 MeV, 2540 MeV and 2814 MeV for the resonances (T = 0, S = 0, L = 0), (T = 0, S = 1, L = 1) and (T = 1, S = 0, L = 1), respectively.     

A generator coordinate approach for the description of pairing vibrations in the seniority-zero space

The application of the generator coordinate method is extended to non-harmonic systems. The many-dimensional Hill-Wheeler integral equation is reduced to a one-dimensional integral equation by expressing all independent parameters in the generator function by a single parameter. It is shown that the subspace spanned by a proper single-parameter family is the same as that spanned by the many-parametric family of generator functions.     

Sulle curve algebriche piane con infiniti assi di simmetria obliqua (in particolare ortogonale)

Riassunto In questa Nota viene elementarmente dimostrato che le coniche sono le sole curve algebriche piane con infiniti assi di simmetria obliqua (in particolare ortogonale).

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Résumé Dans cette Note on démontre, tout simplement, que les coniques sont les seules courbes algébriques planes avec d'infinis axes de symmétrie oblique (en particulier orthogonale).

     

Sulla esistenza e sulla costruzione effettiva con la «piccola variazione» delle curve algebriche piane con assi di simmetria obliqua (in particolare ortogonale)

Riassunto Dimostrati alcuni opportuni teoremi viene datoun metodo per la ricerca degli eventuali assi di simmetria obliqua (in particolare ortogonale) di una curva algebrica piana di ordinen, nota che sia la sua equazione cartesiana e, viceversa, con l'uso della ?piccola variazione? viene indicato un procedimento costruttivo atto a tracciare curve algebriche piane di ordinen, dotate di dati requisiti di simmetria ed un procedimento analitico per scriverne la relativa equazione.

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Résumé Après avoir démontré quelques thêorèmes utiles on donneune méthode pour la recherche des éventuels axes de symétrie oblique (en particulier de symétrie orthogonale) pour une courbe algébrique plane d'ordren, si l'on conna?t son équation carthésienne. Vice versa, à l'aide de la ?petite variation?, on donne quelques avisements opportuns pour procéder ensuite à la construction effective des courbes algébriques planes d'ordren, douées de certaines qualités de symétrie et un procédé analytique pour écrire l'équation relative.

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Nota III     

Analysis of therapeutical effects of Er:YAG and CO2 laser post treatments of small hemangiomas

The main goal of our study was the evaluation of treatment efficiency of two types of ablative laser-CO₂ and Er:YAG (or ERB) treatment. 183 patients (Er:YAG—105 patients, CO₂—78 patients) were analyzed to compare the curative effects and adverse events, such as loss of pigment and appearance of scars caused by these two lasers. The results of the study showed the slightly better effectiveness of Er:YAG laser radiation in comparison with CO₂ laser in the case of treatment of small hemangiomas up to 3 mm in diameter. In the Er:YAG laser application the curative effect was in 99%, hypo-pigmentation occurred in 18%, and scars in 70% of all treatments. In the CO₂ laser application the curative effect was in 97%, hypo-pigmentation in 52%, and scars in 77% from all treatments.