The problem of qualitative and quantitative health analysis

In this article hygienic and functional-physiological approaches at identifying psycho-physiological conditions among students are considered. Research methods: sanitary-hygienic, medical-statistical-depth study of individual health

The problem of qualitative and quantitative health analysis

In this article hygienic and functional-physiological approaches at identifying psycho-physiological conditions among students are considered. Research methods: sanitary-hygienic, medical-statistical-depth study of individual health

FUNCTIONAL FOOD COMPOSITIONS BASED ON WHEY PROTEIN ISOLATE, FISH OIL AND SOY PHOSPHOLIPIDS

The aim of the research was to study the impact of whey protein isolate on the solubility and oxidative stability of the lipid composition based on soy phosphatidylcholine and fish oil. The relationship between the molecular parameters (density; ζ-potential) of the formed complex particles and their functional properties was found using laser light scattering (static, dynamic, electrophoretic) and spectrophotometry. The studied compositions could be used as the basis for the development of multifunctional food additives with an objective of the enrichment of foods and beverages with omega-3 polyunsaturated fatty acids (PUFAs). The main advantages of such composition are a high level of protection of the lipids against oxidation and degradation, a high solubility in an aqueous medium and the clean label.The aim of the research was to study the impact of whey protein isolate on the solubility and oxidative stability of the lipid composition based on soy phosphatidylcholine and fish oil. The relationship between the molecular parameters (density; ζ-potential) of the formed complex particles and their functional properties was found using laser light scattering (static, dynamic, electrophoretic) and spectrophotometry. The studied compositions could be used as the basis for the development of multifunctional food additives with an objective of the enrichment of foods and beverages with omega-3 polyunsaturated fatty acids (PUFAs). The main advantages of such composition are a high level of protection of the lipids against oxidation and degradation, a high solubility in an aqueous medium and the clean label

ОСОБЕННОСТИ КОМПЛЕКСООБРАЗОВАНИЯ КСИЛЕНОЛОВОГО ОРАНЖЕВОГО С Bi(III) И ЕГО СПЕКТРОФОТОМЕТРИЧЕСКОЕ ОПРЕДЕЛЕНИЕ В ФАРМАЦЕВТИЧЕСКИХ ПРЕПАРАТАХ

The complexation features of Bi(III) with xylenol orange (XO) have been studied. It was found that three complexes of different stoichiometry have been formed in the studied system. The complex composition of Bi(III) : XO = 1 : 1 (λ = 540 nm, ε = 17000, log β = 10.5) has been formed at pH = 1.0 in reagent excess, and its dimerization with the formation of the complex stoichiometry 2 : 2 (λ = 560 nm, ε = 24000, log β = 17.8) has been observed in excess of Bi (III). The complex composition of Bi(III) : XO = 1 : 2 has been formed with weak light absorbing properties (λ = 500 nm, ε = 9000, log β = 9.9) at pH = 6.8. The complexation mechanism of Bi(III) with XO has been proposed based on the totality of the spectrophotometric data and its theoretical interpretations. In the acidic environment (pH = 1.0) the coordinating ion is Bi3+ and coordinated ligand is an ionized by sulfo-groups reagent form. At pH = 6.8, the ion chelator is BiOH2+, and XO reacts in ionized by sulfo and carboxyl groups form. The effect of extraneous ions on the absorbance value of the complex Bi (III) with a XO at pH = 1.0 was studied. The complex with molar ratio 1 : 1 is recommended as an analytical form. Beer’s law holds in the Bi(III) concentrations range 0.4-10.0 μg/cm3. The detection limit is 0.12 μg/cm3 and the limit of quantification is 0.37 μg/cm3. The simple method of spectrophotometric determination of Bi(III) with xylenol orange in pharmaceuticals has been developed.Keywords: spectrophotometric analysis, complexation, xylenol orange, bismuth (III), pharmaceuticals(Russian)DOI: http://dx.doi.org/10.15826/analitika.2016.20.3.007 A.N. Chebotarev, D.V. Snigur, V.P. Dubovyiy  Odessa I.I. Mechnikov National University ul. Dvorianskaya, 2, Odessa, Ukraine, 65082Изучены особенности комплексообразования Ві(ІІІ) с ксиленоловым оранжевым (КО) и установлено, что в исследуемой химической системе образуется три комплекса разной стехиометрии. При рН = 1.0 в избытке реагента образуется комплекс состава Ві(ІІІ) : КО = 1 : 1 (λ = 540 нм, ε = 17000, log β = 10.5), а в избытке Ві(ІІІ) наблюдается его димеризация с образованием комплекса состава 2 : 2 (λ = 560 нм, ε = 24000, log β = 17.8). При рН = 6.8 образуется комплекс состава 1 : 2 со слабыми светопоглощающими свойствами (λ = 500 нм, ε = 9000, log β = 9.9). На основании совокупности спектрофотометрических данных и их теоретической интерпретации предложен химизм комплексообразования Ві(ІІІ) с КО. В кислой среде (рН = 1.0) координирующим ионом является Bi3+, а координированным лигандом – ионизированная по сульфо-группе форма реагента. При рН = 6.8 комплексообразователем выступает ион BiОН2+, а КО вступает в реакцию в ионизированной по сульфо- и карбоксильным группам форме. Изучено влияние посторонних ионов на величину оптической плотности комплекса Ві(ІІІ) с КО при рН = 1.0. В качестве аналитической формы рекомендован комплекс состава 1 : 1, при использовании которого закон Бэра выполняется в диапазоне концентраций Ві(ІІІ) 0.4-10.0 мкг/см3. Нижний предел обнаружения – 0.12 мкг/см3, предел количественного определения – 0.37 мкг/см3. Предложена методика спектрофотометрического определения Ві(ІІІ) в фармацевтических препаратах с ксиленоловым оранжевым, характеризующаяся относительной погрешностью определения не превышающей 3.5 %.Ключевые слова: спектрофотометрический анализ, комплексообразование, ксиленоловый оранжевый, висмут(ІІІ), фармацевтические препараты DOI: http://dx.doi.org/10.15826/analitika.2016.20.3.00

Kernels on Graphs as Proximity Measures

International audienceKernels and, broadly speaking, similarity measures on graphs are extensively used in graph-based unsupervised and semi-supervised learning algorithms as well as in the link prediction problem. We analytically study proximity and distance properties of various kernels and similarity measures on graphs. This can potentially be useful for recommending the adoption of one or another similarity measure in a machine learning method. Also, we numerically compare various similarity measures in the context of spectral clustering and observe that normalized heat-type similarity measures with log modification generally perform the best

An impossibility theorem for paired comparisons

In several decision-making problems, alternatives should be ranked on the basis of paired comparisons between them. We present an axiomatic approach for the universal ranking problem with arbitrary preference intensities, incomplete and multiple comparisons. In particular, two basic properties -- independence of irrelevant matches and self-consistency -- are considered. It is revealed that there exists no ranking method satisfying both requirements at the same time. The impossibility result holds under various restrictions on the set of ranking problems, however, it does not emerge in the case of round-robin tournaments. An interesting and more general possibility result is obtained by restricting the domain of independence of irrelevant matches through the concept of macrovertex.Comment: 18 pages, 4 figure

The lower thermosphere wind regime from simultaneous observations over Euroasia (Collm, Dushanbe, Frunze)

The circulation in the lower thermosphere as determined from the results of measurements in 1984 is considered. Ionospheric drift measurements were taken using the method of spaced reception in the long wave range. Other measurements were taken using the D2 method. Average daily values of wind velocity were used. Discontinuity of measurements ranged from a day to a week. Preliminary data were reduced to the common average height of 93 km with the help of vertical profiles of wind velocity components. The results of measurements of zonal and meridional wind velocity components are presented. Zonal circulation changes from westerly to easterly winds were observed in winter, in periods of spring time reversal and during stratomesospheric rises in temperature

Covariant Quantum Dynamical Semigroups: Unbounded generators

A survey of the probabilistic approaches to quantum dynamical semigroups with unbounded generators is given. An emphasis is made upon recent advances in the structural theory of covariant Markovian master equations. The relations with the classical Levy-Khinchin formula are elucidated. As an example, a complete characterizations of the Galilean covariant irreversible quantum Markovian evolutions is given in terms of the corresponding quantum master and Langevin equations. Important topics for future investigation are outlined.Comment: 14 pages,Latex, no figures, submitted to the Semigroup Volume, Group 21, Goslar 199

Non-equilibrium states of a photon cavity pumped by an atomic beam

We consider a beam of two-level randomly excited atoms that pass one-by-one through a one-mode cavity. We show that in the case of an ideal cavity, i.e. no leaking of photons from the cavity, the pumping by the beam leads to an unlimited increase in the photon number in the cavity. We derive an expression for the mean photon number for all times. Taking into account leaking of the cavity, we prove that the mean photon number in the cavity stabilizes in time. The limiting state of the cavity in this case exists and it is independent of the initial state. We calculate the characteristic functional of this non-quasi-free non-equilibrium state. We also calculate the energy flux in both the ideal and open cavity and the entropy production for the ideal cavity.Comment: Corrected energy production calculations and made some changes to ease the readin

Diffusive limit for a quantum linear Boltzmann dynamics

In this article, I study the diffusive behavior for a quantum test particle interacting with a dilute background gas. The model I begin with is a reduced picture for the test particle dynamics given by a quantum linear Boltzmann equation in which the gas particle scattering is assumed to occur through a hard-sphere interaction. The state of the particle is represented by a density matrix that evolves according to a translation-covariant Lindblad equation. The main result is a proof that the particle's position distribution converges to a Gaussian under diffusive rescaling.Comment: 51 pages. I have restructured Sections 2-4 from the previous version and corrected an error in the proof of Proposition 7.