Annual General meeting of the Department of the Biochemistry,Biophysics, and Chemistry of Physiologically active compounds of the Academy of Sciences of the USSR,March 16, 1976, Moscow

Chronicles

Annual General meeting of the Department of the Biochemistry, Biophysics, and Chemistry of Physiologically active compounds of the Academy of Sciences of the USSR, March 16, 1976, Moscow     

An investigation of the efficacy of organotin compounds for the control of the cotton stainer,Dysdercus cingulatus,the mosquito,Anophelese stephensi,and the common house fly,Musca domestica

A series of commercial organotin compounds was screened for efficacy against the three insect species Dysdercus cingulatus (cotton stainer), Anophelese stephensi (mosquito) and Musca domestica (house fly). Tributyltin species in the general order Bu₃SnCl>(Bu₃Sn)₂O>Bu₃Sn(linoleate) were more effective than two triphenyltin compounds. Tricyclohexyltin hydroxide, dimethyltin chloride, phenyltin trichloride and a diethyltin dichloridephenanthroline adduct were less effective.     

血清铁、锌、钙、镁、磷与妊娠的关系探讨

为探讨血清铁、锌、钙、镁、磷在孕妇体内的水平，做好围产期孕妇的保健工作，提高孕产妇的健康水平和新生儿健康素质，抽取125例孕中期妇女空腹静脉血，采用透射比浊法测定了其血清铁、锌、钙、镁、磷的含量。结果表明，铁、锌、钙、镁、磷的异常在孕妇中有一定的发生率，其中尤以钙与锌的缺乏最为多见。提示应定期检测孕妇血清铁、锌、钙、镁、磷水平，并采取相府的防治措施．以提高孕产妇及新生儿的健康水平。     

Ab initio investigation of the hydration of the tetrahedral perchlorate, perbromate, selenate, arsenate, and vanadate anions

The geometries, energies, and vibrational frequencies of various isomers of XO(4)(m-)(H2O)n, x = Cl, Br, Se, As, V; n = 0-6, m = 1-3 are calculated at various levels up to MP2/6-31+G*. These properties are studied as a function of increasing cluster size. The experimental and theoretical vibrational spectra are compared where available.     

On the homogeneity range of the κ phases in the Hf-Mo-{Si,P, S,Ge, As,Se} systems

A survey of the various two- and three-phase equilibria involving the κ phases in the subsolidus regions of the ternary Hf-Mo-{Si, P, S, Ge, As, Se} systems has been made. The κ phases have homogeneity ranges, accompanied by variations in the unit-cell volumes. The hexagonal κ-phase structure is composed of a transition metal sublattice with triangular prismatic and octahedral interstices. The nonmetal atoms may occupy one or both types of interstices. Phase-analytical and crystallographic results suggest a variable degree of hafnium substitution on the molybdenum sites in the metal sublattice as the major cause of the variations in composition observed. The κ phase in the Hf-Mo-S system exhibits a particularly large extension of the homogeneity range. This fact might be interpreted in terms of an enhanced thermodynamic stability of this phase, connected with the filling of both octahedral and triangular prismatic sites by sulfur in the structure, in contrast to the empty octahedral sites in the remaining κ phases.     

Structure of the product of the reaction of elemental phosphorus,propylene oxide,phenol, and triethylamine

The composition and structure of an oligomer has been studied, formed in the reaction of elemental phosphorus (P₄) with propylene oxide, phenol, and triethylamine in the ratio 150.81. It has been found by using mass spectrometry, IR and³¹P NMR spectrometry, chromatography and ebulliometry that the oligomer represents a chain consisting of fragments of isopropylphosphonous acid. Products of side reactions have been identified.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2244–2247, October, 1989.     

Biogeochemical migration of heavy metals, Ti, V, Mo, Ta, W, and U, in the profile of a low-laid peatbog in the country between the Ob and Tom rivers

Biogeochemical migration of heavy metals in the course of marsh formation is mainly determined by physical-chemical processes, such as the oxidation-reduction zonality of the peatbog thickness and the state of humous substances (the quality of humus adsorptive barriers). In the process of peatbog formation V, U, Ta are the weakly captured elements while Mo is captured to a relatively higher extent. Elements as Ti and W are found in separate layers. No technogenic degradation of the marsh ecosystem in the Ob and Tom has been observed.     

Investigation of the IR,PMR, UV,and mass spectra of betaines of the azole series

It was established by a complex spectral method that 5-formyl-4-(1-pyridinia)thiazole 2-oxide and 1-phenyl-5-formyl-(1-pyridinia)imidazole 2-oxide have betaine structures.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 255–257, February, 1978.     

Iso-radioactivity curves of the water of the Hazar Lake, Elazig, Turkey

Alpha and beta radioactivity concentrations have been determined in the Hazar Lake (East of Turkey) surface, middle and bottom water. The total alpha-radioactivity concentration in the surface, middle and bottom levels varies from 0.32 to 2.52 Bq/l, from 0.21 to 2.70 Bq/l and from 0.12 to 0.96 Bq/l, respectively. The beta-radioactivity concentration in the surface, middle and bottom water levels varies from 0.01 to 0.16 Bq/l, from 0.01 to 0.27 Bq/l and from 0.03 to 0.23 Bq/l, respectively. The iso-radioactivity curves were drawn from the obtained data during 1998–2001. This revised version was published online in July 2006 with corrections to the Cover Date.     

Prediction of the enthalpy of vapourisation for anhydrides,formates, acetates,propionates, butyrates,esters, and ethers

Four analytical correlations based on the use of the corresponding states principle were used to calculate the enthalpy of vapourisation of fluids. Three of these correlations require as inputs the critical temperature and the acentric factor. The fourth requires a molecular Lennard–Jones parameter and the acentric factor. Results for 184 polar and non-polar fluids grouped into 9 families are compared with the values accepted by the Design Institute for Physical Property (DIPPR) project. Recommendations are given for the use of each model and for the choice of the adequate model for each family of fluids.     

Application of the partitioning of energy in the mndo method to the study of the basicity of imidazole,pyrazole, oxazole,and isoxazole

The technique of energy partitioning of Fischer and Kollmar has been extended to the MNDO SCF-MO method and used in an effort to ascertain the main factors which determine the greater basicity of imidazole and oxazole relative to pyrazole and isoxazole, respectively. The importance of the different degree of destabilization of the five-membered ring π bonding in these azoles upon protonation is specially emphasized in relation to their relative basicity. Furthermore, it is found that the degree of destabilization of the π bonding can be ascribed to the amount of π electron charge density localized on the heteroatoms after protonation. An interpretation for this result is given in terms of the mutual electrostatic field effect due to the cores of the nearest-neighbor atoms.     

Kinetics of the reactions of the IO radical with dimethyl sulfide,methanethiol, ethylene,and propylene

The reactions of IO radicals with CH₃SCH₃, CH₃SH, C₂H₄, and C₃H₆ have been studied using the discharge flow method with direct detection of IO radicals by mass spectrometry. The absolute rate constants obtained at 298 K are the following: IO + CH₃SCH₃ → products (1): k₁ = (1.5 ± 0.2) × 10^?14; IO + CH₃SH → products (2): k₂ = (6.6 ± 1.3) × 10^?16; IO + C₂H₄ →products (3): k₃ < 2 × 10^?16; IO + C₃H₆ → products (4): k₄ < 2 × 10^?16 (units are cm³ molecule^?1 s^?1). CH₃S(O)CH₃ and HOI were found as products of reactions (1) and (2), respectively. The present lower value of k₁ compared to our previous determination is discussed.     

Enthalpies of Formation of the Tellurites of the Rare Earths Gd, Tb, Dy, Tm and Yb

By using a DSK of the French firm Seteram, the standard enthalpies of formation of 5 tellurites and 5 tetratellurites of the rare earths Gd, Tb, Dy, Tm and Yb were determined for the first time. Three parallel determinations for each sample were compared. The results are very similar, which is an indication of the great reliability of the method used and the correctness of the data obtained. This revised version was published online in July 2006 with corrections to the Cover Date.     

Rotational spectra, structures, hyperfine constants, and the nature of the bonding of KrCuF and KrCuCl

Rotational spectra of KrCuF and KrCuCl have been measured in the frequency range 8-18 GHz, using a pulsed jet cavity Fourier transform microwave spectrometer. The molecules were prepared by ablating Cu metal with a pulsed Nd:YAG laser (1064 nm) and allowing the plasma to react with appropriate precursors (Kr plus SF(6) or Cl(2)) contained in the backing gas of the jet (Ar or Kr). Rotational constants, internuclear distances, vibration frequencies, and (83)Kr, Cu, and Cl nuclear quadrupole coupling constants have all been evaluated. The Kr-Cu bonds are short and the complexes are rigid. The (83)Kr coupling constant of KrCuF is large (128.8 MHz). The Cu nuclear quadrupole coupling constants differ radically from those of uncomplexed CuF and CuCl molecules. The results are supported by those of ab initio calculations, which have also yielded Mulliken populations, MOLDEN plots of valence molecular orbitals and Laplace concentrations, and electron localization functions. The results are consistent with those reported earlier for other noble gas-noble metal halide complexes. The results have been used to assess the nature of the bonding in the complexes and have produced good evidence for weak noble gas-noble metal chemical bonding.     

Observations of the effect of anionic, cationic, neutral, and zwitterionic surfactants on the Belousov-Zhabotinsky reaction

In this paper we report the experimental observations of the effects of various surfactants on the oscillations of the ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction. The oscillations are followed by observing the change in absorbance at 510 nm due to ferroin in a well-stirred closed BZ reacting system. We have used sodium dodecyl sulfate (SDS) as the anionic surfactant, cetyl trimethylammonium bromide (CTAB) as the cationic surfactant, Triton X-100 as the neutral surfactant, and 3-[(3-cholamidopropyl)dimethylammonio)]-1-propanesulfonate (CHAPS) as the zwitterionic surfactant. In general, we observed that there is a change in the oscillation behavior in the presence of each of these surfactants above their critical micellar concentrations. For different surfactants, the time-dependent evolution of the oscillations is found to be characteristic of the surfactant. The results of our study suggest that the evolution of oscillations is most regular in the presence of micelles of SDS.     

Isolation,analysis, biosynthesis,and modification of the alkaloid cytisine

Information on methods of isolation and analysis of the alkaloid cytisine and its derivatives and questions of structure and modification over the last 25 years are generalized.Institute of Organic Synthesis and Coal Chemistry, Khazakhstan Academy of Sciences, Karaganda. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 301–313, May–June, 1991.