Authors:Daria A. Morozova, Vladimir N. Voronin, and Alexey V. Katokhin
This paper reports the detection of the myxozoan species Myxobolus elegans Kashkovsky 1966 in common dace (Leuciscus leuciscus) that has not been previously listed as its host. The problem of differentiation of phenotypically similar Myxobolus species is addressed. During parasitological survey of common dace from the desalinated part of the Gulf of Finland at the city of Sestroretsk, Russia, numerous oval-shaped plasmodia, 0.2–0.4 mm in size, filled with Myxobolus spores were found on the gills. Pear-shaped myxospores were 15.4 (14.8–16.0) × 10.2 (9.6–10.9) µm in size with a rib on each valve. On the basis of spore morphology, the species appeared to be similar to M. elegans and Myxobolus hungaricus Jaczó, 1940. In order to identify the species, molecular genetic analysis was performed, and the species was identified on the basis of morphological characteristics and 18S rDNA data. The results obtained indicate that the Myxobolus species observed on the gills of dace is M. elegans. Thus, common dace is another valid host of M. elegans besides the type host, ide (Leuciscus idus).
Authors:N. Morozova, P. Semyannikov, S. Sysoev, V. Grankin, and I. Igumenov
The temperature dependency of the saturated vapor pressure of Ir(acac)3 has been measured by the method of calibrated volume (MCV), the Knudsen method, the flow transpiration method, and the membrane
method. The thermodynamic parameters of phase transition of a crystal to gas were calculated using each of these methods,
and the following values of ΔHT0 (kJ mol−1) and ΔST0 (J mol−1K−1), respectively, were obtained: MCV: 101.59, 156.70; Knudsen: 130.54, 224.40; Flow transpiration: 129.34, 212.23; Membrane:
Coprocessing of obtaining data (MCV, flow transportation method and Knudsen method) at temperature ranges 110−200C as also
conducted:ΔHT0 =127.92.1 (kJ mol−1 ); ΔST0 =215.25.0 (J mol−1 K−1 ).
Authors:N. Morozova, K. Zherikova, P. Semyannikov, S. Trubin, and I. Igumenov
Complexes of ruthenium(III) with the following beta-diketones: 2,4-pentanedione (Ru(acac)3), 1,1,1-trifluoro-2,4-pentanedione (Ru(tfac)3), 2,2,6,6-tetramethyl-3,5-heptanedione (Ru(thd)3), 2,2,6,6–tetramethyl-4-fluoro-3,5-heptanedione (Ru(tfhd)3) and 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione (Ru(ptac)3) were synthesized and identified by means of mass spectrometry. By effusion Knudsen method with mass spectrometric registration
of gas phase composition the temperature dependencies of saturated vapor pressure were measured for ruthenium(III) compounds
and the thermodynamic characteristics of vaporization processes enthalpy ΔHT* and entropy
Authors:S. Sysoev, T. Cheremisina, L. Zelenina, S. Tkachev, K. Zherikova, N. Morozova, and N. Kuratieva
The comprehensive analysis of volatile β-diketonate compound—ruthenium(III) trifruoroacetylacetonate (Ru(tfac)3)—was carried out. By means of flow method in quasi-equilibrium conditions and static method the temperature dependencies
of saturated vapor pressure have been measured over solid and liquid cis- and trans-modifications of Ru(tfac)3 and isomer mixture. The thermodynamic characteristics of sublimation, evaporation, melting, and phase conversion have been
calculated for structural isomers. Also by differential-scanning calorimetry the temperature meanings and the thermodynamic
characteristics of melting have been determined for individual isomers of Ru(tfac)3 and their mixtures. By XRD the structures for cis- and trans-modifications have been determined. Both structures consist of neutral molecules arranged in pseudo layers.
Authors:A. Bessonov, N. Morozova, P. Semyannikov, S. Trubin, N. Gelfond, and I. Igumenov
The thermal properties of dimethylgold(III) carboxylates of general formula [(CH3)2Au(OOCR)]2 (R=methyl (1), tert-buthyl (2), trifluoromethyl (3), or phenyl (4)) in solid state have been investigated by the thermogravimetric analysis. The temperature dependences of saturated vapour
pressure of complexes have been studied by the Knudsen effusion method with mass spectrometric indication. The thermodynamic
parameters ΔsubHT0 and ΔsubST0 of the sublimation processes have been calculated. Thermal decomposition of the vapour of complexes 1 and 2 has been studied by means of high temperature mass spectrometry in vacuum, and by-products of decomposition have been determined.
Authors:V. I. Belevantsev, K. V. Zherikova, N. B. Morozova, V. I. Malkova, and I. K. Igumenov
A universal (that is, actual for any reaction) interconnection between enthalpy (ΔrH), entropy (ΔrS), and Gibbs energy (ΔrG) was applied to the analysis of the formation of saturated vapor of individual condensed (liquid and solid) substances. This allowed us to specify the conceptual and metrological sense of thermodynamic parameters available for estimation within the framework of tensimetric investigations. Proposals for the procedures of experimental data processing were made. The informativity of the approach was illustrated by the example showing the results of processing two arrays of primary data obtained using the static and the flow methods for crystal hafnium(IV) dipivaloylmethanate.
Authors:N. Morozova, P. Semyannikov, S. Trubin, P. Stabnikov, A. Bessonov, K. Zherikova, and I. Igumenov
Volatile compounds of iridium(I): (acetylacetonato)(1,5-cyclooctadiene)iridium(I) Ir(acac)(cod), (methylcyclopentadienyl)
(1,5-cyclooctadiene)iridium(I) Ir(Cp’)(cod), (pentamethylcyclopentadienyl)(dicarbonyl) iridium(I) Ir(Cp*)(CO)2 and (acetylacetonato)(dicarbonyl)iridium(I) Ir(acac)(CO)2 were synthesized and identified by means of element analysis, NMR-spectroscopy, mass spectrometry.
Thermal properties in solid phase for synthesized iridium(I) complexes were studied by means of thermogravimetric analysis
in inert atmosphere (He). By effusion Knudsen method with mass spectrometric registration of gas phase composition the temperature
dependencies of saturated vapor pressure were measured for iridium(I) compounds and the thermodynamic characteristics of vaporization
processes enthalpy ΔHT* and entropy ΔST0 were determined. The energy of intermolecular interaction in the crystals of complexes was calculated.
Authors:S. Sysoev, N. Morozova, G. Zharkova, I. Igumenov, P. Semyannikov, and V. Grankin
A thermoanalytical study of the diethyldithiocarbamates of the platinum metals Pt(II), Pd(II), Rh(III), Ir(III) and Ru(III)
was carried out by means of DTA techniques in an inert atmosphere and in vacuum. Decomposition temperatures were determined
and the mass loss curves were obtained for these compounds in helium and in vacuum. The X-ray diffraction patterns of the
solid products of M(dtk)n thermolysis were studied. The temperature dependences of the saturated vapour pressures of the listed
chelates were measured by flow and Knudsen methods, and the vaporization parameters were determined.