Palladium-bismuth intermetallic and surface-poisoned catalysts for the semi-hydrogenation of 2-methyl-3-butyn-2-ol

The effects of poisoning of Pd catalysts with Bi and annealing in a polyol (ethylene glycol) were studied on the semi-hydrogenation of 2-methyl-3-butyn-2-ol (MBY). An increase in the Pd:Bi ratio from 7 to 1 in the Bi-poisoned catalysts decreased the hydrogenation activity due to blocking of active sites, but increased maximum alkene yield from 91.5% for the Pd catalyst to 94–96% for all Bi-poisoned Pd catalysts, by decreasing the adsorption energy of alkene molecules and suppressing the formation of β-hydride phase. Annealing of the catalysts induced the formation of intermetallic phases and decreased its activity due to sintering of the catalytic particles and low activity of intermetallic compounds. Langmuir–Hinshelwood kinetic modelling of the experimental data showed that poisoning of Pd with Bi changed the relative adsorption constants of organic species suggesting ligand effects at high Bi content

Androgynous plot in the oeuvre of Z.N. Gippius and its reflection in the novel by V.V. Nabokov "The gift"

This article considers androgynous plot in fictional prose of Z.N. Gippius, exemplified with the short novel “The mirrors” (1896) and the novel “Roman-tzarevitch” (1913), within the frameworks of studying of creative life model of this prominent representative of Russian Silver Age. Androgynous plot as an creative life allusion by Z.N. Gippius created the base for so-called “History if Yasha Chernyshevskiy” , which from hearsay is retold by the main character of V.V. Nabokov’s novel “The Gift” F.K.Godunov-Cherdyntsev. This text vividly expresses author’s polemical attitude to Z.N. Gippius’ creativeyesBelgorod State Universit

Complexity of Expression Control of HSP70 Genes in Extremophilic Midges

© 2016, Springer Science+Business Media New York.Heat shock proteins, including HSP70, are universal well-known agents of protecting cells and entire organism from negative effects of elevated temperature, as well as wide range of other abiotic stresses. Having highly conservative amino acid sequences, in different species they vary in copy number, expression patterns and other molecular and genetic traits. Taking all these notions into consideration, we can perceive the family of HSP70 as a good model for study evolutionary history and differences in stress response of closely relative species. In our study, we focused on comparing the number and specific behaviour of HSP70 genes in response to stress in four non-biting midges from Chironomidae family, including those which can survive extremely hard conditions and one which cannot. Our research proved the high conservatism of the HSP70 group, whereas the behaviour of almost each tetrad of orthologous genes was different among species, and not each one of included genes showed significant response to heat shock and desiccation

Kinetics and mechanism of the pudovik reaction in the azomethine series: II.1 Hydrolysis and catalysis in the reaction of dialkyl phosphites with benzalaniline

A 31P NMR study show that diisopropyl phosphite and benzalaniline do not react with each other as individual components. Adduct formation is made possible by partial hydrolysis of the dialkyl phosphite

Synthesis of α-hydroxy(polyprenyl) bisphosphonates

Bisphosphonates derived from natural terpenes were synthesized by phosphonylation of corresponding aldehydes. The general strategy of introduction of the phosphonate groups into the polyprenol molecule involves successive treatment of a hydroxyl compound by Swern reagent to oxidize the C-OH group into C=O and a (EtO)3P/[PyH]+ClO - 4 mixture to phosphylate the resulting carbonyl compound. © 2014 Pleiades Publishing, Ltd

Extraction properties of new aminophosphinoxide compounds

Extraction of Sc(III) ions by new a-aminomethylphosphinoxides was studied. Preliminary experiments with acid solutions allowed for selection of low-basicity compounds, which demonstrated a poor coefficient of the acids extraction. When applied for the aqueous solution of various salts, they appeared to be good extractants of Sc(III), Fe(III), Bi(III), In(III), and lanthanide ions in toluene and chloroform and discriminated ?o(II), Ni(II), Cu(II), alkaline, and alkaline-earth elements. Copyright © Taylor & Francis Group, LLC

Synthesis, acid-base and complexing properties of N,N,N′,N′-tetrakis(O-butylhydroxyphosphorylmethyl)-1,2-diaminoethane

© 2017, Pleiades Publishing, Ltd. A method of synthesis of organophosphorus analog of ethylenediaminetetraacetic acid (a common complexon), N,N,N′,N′-tetrakis(O-butylhydroxyphosphorylmethyl)-1,2-diaminoethane, has been elaborated. The product structure has been elucidated by means of NMR spectroscopy and X-ray diffraction analysis. Constants of the acid dissociation and the stability of the 1 : 1 complexes with Co(II), Ni(II), and Cu(II) ions have been determined

Radial-piston pump for drive of test machines

The article reviews the development of radial-piston pump with phase control and alternating-flow mode for seismic-testing platforms and other test machines. The prospects for use of the developed device are proved. It is noted that the method of frequency modulation with the detection of the natural frequencies is easily realized by using the radial-piston pump. The prospects of further research are given proof

LEA4 Protein Is Likely to Be Involved in Direct Protection of DNA Against External Damage

© 2016, Springer Science+Business Media New York.Anhydrobiotic larvae of an African chironomid Polypedilum vanderplanki are known to be highly resistant to various abiotic stress factors, including ultraviolet radiation. The comparison of survival rates after different doses of UV irradiation between P. vanderplanki larvae and closely related non-anhydrobiotic Polypedilum nubifer larvae showed strongly enhanced resistance of P. vanderplanki to UV irradiation, especially in completely desiccated state. Plasmid-based assay showed an evidence of contribution of LEA4 protein to the protection of the larvae’s DNA against UV damage

Synthesis and membrane-transport properties of phosphorylated diamines, azapodands and their derivatives

© 2018, © 2018 Taylor & Francis Group, LLC. Membrane–transport properties of synthesized phosphorylated azapodands of a series of metals of I groups were studied. The investigation of the processes of passive membrane ion transport showed the phosphorylated azapodands 2 and 3 were the most selective with respect to the lithium ion. A monophosphorylated podand, which contain a heterocyclic nitrogen atom 8-(1-diamylphosphoryl-3,5-dioxapentane) quinoline 7 was synthesized. The molecular structure of the complex of a podande 7 with a copper ion was determined by the method of X-ray analysis