Reaction of phenols with methylcycloalkenes in the presence of KU-23 catalyst

Cycloalkylation of phenol, p-methylphenol, and p-hexylphenol with 1-methylcyclopentene and 1- and 3-methylcyclohexenes in the presence of KU-23 catalyst in the H form was studied.     

Synthesis of recombinant DNA with the β-galactosidase gene placed under the control of the baculovirus promoter of the polyhedrin gene

A genetic-engineering construction designed for homologous recombination with viral DNA of the wild type has been obtained that is based on the vector pBK273 and contains the DNA sequence of the virus ofBombyx mori nuclear polyhedrosis. The region of the reporter gene LacZ coding β-galactosidase has been inserted into this construction under the control of the strong promoter of the polyhedrin gene, which ensures a high level of expression, and this permits the creation of a model system for expressing proteins. Institute of Plant Genetics and Experimental Biology, Academy of Sciences of the Republic of Uzbekistan, Tashkentskaya Oblast, fax (3712) 64 22 30. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 684–687, September–October, 1998.     

Transport properties and stability of cobalt doped proton conducting oxides

Cobalt doping between 2 and 10 at.% was utilized to lower the required sintering temperature of materials in the series BaCe_0.5Zr_0.4(Y,Yb)_0.1 ? yCo_yO_3 ? δ to between 1373 and 1698 K. The required sintering temperature decreased with increasing Co content; however, significant electronic conductivity was observed in both oxidizing and reducing environments for materials with 10 at.% Co. This was accompanied by a loss of chemical stability in H₂O/H₂ and CO₂ environments. BaCe_0.5Zr_0.4Yb_0.07Co_0.03O_3 ? δ was stable in these environments and provided the highest proton conductivity of the materials tested, 1.98 × 10^? 3 S/cm at 923 K in humidified H₂. Measurements in a hydrogen concentration cell indicated that the total ionic transference number for this material was between 0.86 and 1.00 with proton transference number between 0.84 and 0.75 at 773 and 973 K respectively. Under oxidizing conditions, the ionic transference number decreased to below 0.10. The grain boundary resistance dominated the total conductivity at low temperatures but was found to decrease with increased sintering temperature due to grain growth.     

Halo-substituted 1-buten-3-ynes

Conclusions Some halo-substituted 1-buten-3-ynes were synthesized by the reaction of alkoxy-, alkylthto-, and alkyl-1-buten-3-ynes with alkaline metal hypohalites.Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 10, pp. 2353–2354, October, 1972.     

Volatile Constituents from the Aerial Part of Thermopsis alterniflora

Chemistry of Natural Compounds -     

Synthesis of corrected multi-wavelength spectrometers for atmospheric trace gases

The method for synthesis of corrected three-wavelengths spectrometers for trace gas components of atmo- sphere on the basis of development of mathematical model has been suggested. The classification table for possible structures of corrected spectrometers is considered. The synthesis allows to reveal some new variants for development of three-wavelength spectrometers for trace gas components of atmosphere. For experimental checkup of achieved theoretical results, a laboratory pattern of three-wavelength spectrome- ter is developed and tested.     

Chemical composition,antimicrobial and antioxidant activities of the essential oils of three Uzbek Lamiaceae species

The chemical composition of the essential oil from the aerial parts of three Lamiaceae species from Uzbekistan was investigated by GC-MS analysis. β-Linalool (26.6%), α-terpineol (10.0%), coumarin (8.9%) and 4,5,7,7α-tetrahydro-4,4,7α-trimethyl-2(6H)-benzofuranone (5.4%) resulted as the main components of Ajuga turkestanica essential oil, while camphene (17.1%), 1,8-cineole (15.9%), β-cymene (7.9%) and limonene (7.4%) in Phlomis regelii. The essential oil of Thymus seravschanicus was dominated by thymol (37.5%), phellandral (26.0%), τ-terpinene (6.6%) and β-cymene (5.2%). The essential oils had considerable antimicrobial activity against different bacterial strains and fungi. Among the tested samples of essential oils, P. regelii essential oil has the significant antioxidant activity with IC₅₀ value of 117.8 ± 8.02 μg/mL.     

Induction of the PAOX1-Promoter and Synthesis of GFP Protein in Wild X-33 Strain Recombinant <Emphasis Type="Italic">Pichia pastoris</Emphasis> Yeast Cells

Recombinant clones of X-33 strain Pichia pastoris containing the marker gene yEGFP were prepared. The optimal methanol concentration in the medium for induction of heterologous expression was determined in the recombinant clones.__________Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 60–62, January–February, 2005.