Isosteviol derivatives having azine and hydrazide fragments

Diterpenoid isosteviol (ent-16-oxobeyeran-19-oic acid) and its methyl ester and chloride reacted with hydrazine hydrate to give derivatives having azine and hydrazide fragments.     

Methanolysis of stereoisomeric 4β-chloro-3,10-epoxycaranes

Conclusions Under conditions of acid methanolysis, the stereoisomeric 4-chloro-3,10- and 3,10-epoxycaranes form addition products with predominant cleavage of the oxide ring at the C₁₀-0 bond, while on alkaline catalysis they form products with cleavage of the C₃-0 bond.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2809–2812, December, 1987.     

Energy spectrum of cascade showers generated in water by near-horizontal muons

We discuss measuring cascade shower energy using the NEVOD Cherenkov water detector with a spatial lattice of quasi-spherical modules (QSMs). Dense QSM spacing makes it possible to reconstruct a number of cascade particles along the shower axis from the PMT response amplitude. Our cascade curve reconstruction technique is applied to showers generated by near-horizontal high-energy muons selected using the DECOR coordinate detector deployed around NEVOD. The first results from cascade energy spectrum measurements are reported.     

First synthetic macrocyclic compounds in the series of <Emphasis Type="Italic">ent</Emphasis>-beyerane diterpenoids

New macrocyclic compounds were synthesized by reaction of 16-hydroxy-ent-beyeran-19-oic acid (derivative of the diterpenoid isosteviol with reduced ketone group) with adipic, suberic, and sebacic acid chlorides.     

Synthesis of Schiff bases on the basis of the isosteviol terpenoid

The transformation of the carboxy and keto groups of the isosteviol (ent-16-ketobeyeran-19-oic acid) diterpenoid was used to synthesize its new nitrogen-containing derivatives, including Schiff bases by the C⁴ and C¹⁶ atoms of the isosteviol frame. The structure of the resulting compounds was established by X-ray diffraction.     

Elimination of Diurnal,Annual, and Solar Variations in the Matrix Observations of the URAGAN Muon Hodoscope

Physics of Atomic Nuclei - A method for elimination of periodical diurnal, annual, and 27-day and 11-year solar variations in the matrix observations of the URAGAN muon hodoscope was developed. The...     

Cascade showers in the NEVOD Cherenkov water detector

A technique for measuring the cascade shower energy in the NEVOD Cherenkov water detector with a spatial lattice of quasi-spherical modules is discussed. The technique allows the number of cascade particles that move near the shower axis to be reconstructed on the basis of analysis of response amplitudes of triggered photomultiplier tubes. The technique of cascade-curve reconstruction was applied to cascade showers generated by near-horizontal high-energy muons extracted by means of the DECOR coordinate-tracking detector arranged around the Cherenkov water detector. The first results of measuring the energy spectrum of cascade showers of 10–1000 GeV are presented.     

Crystal structure of N-(β-acetoxyethyl)-4-methylpyridinium bromide

In continuation of previous studies [1] on structures of compounds differing from acetylcholine and choline by having a pyridine ring instead of the quaternary N atom, the x-ray structure of N-(-acetoxyethyl)-4-methylpyridinium bromide, which has cholinergic activity [2], is solved.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1813–1816, August, 1991.