Diagnostics of the Degree of Calcification of Atherosclerotic Plaque by Laser-Induced Fluorescence

The luminescence of highly calcified atherosclerotic plaque in comparison with the luminescence of a normal wall of the vessel was studied in vitro (the luminescence was excited by a CW argon laser with λ = 488 nm or a pulsed nitrogen laser with λ = 337 nm). The mass-spectroscopy analysis of the plaque was carried out with a LAMMA-1000 system. It is ascertained that the specific shape of the luminescence spectrum with maximum at λ = 560 nm (under argon laser excitation) and λ = 485 nm (under nitrogen laser excitation) is typical of a highly calcified plaque (Ca content ≈38 %) and is similar to the luminescence spectrum of ordinary chalk.     

Synthesis and X-ray structural study of 1-adamantylmethyl 2-cyanoacrylate and 1,10-decanediol bis-2-cyanoacrylate

I-Adamantylmethyl 2-cyanoacrylate (1) was prepared by the reaction of 2-cyanoacryloyl chloride with 1-adamantylmethanol . 1,10-Decanediol bis-2-cyanoacrylate (2) was synthesized by transesterification of methyl 2-cyanoacrylate with 1,10-decanediol. Esters1 and2 were studied by X-ray structural analysis.Deceased in 1995.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2288–2292, September, 1996.     

Carboxylate phosphabetaines based on tertiary phosphines and unsaturated dicarboxylic acids

By reaction of triorganylphosphines with unsaturated dicarboxylic acids adducts of betaine structure were synthesized whose stability depended on the character of substituents at phosphorus and on the structure of acid. The betaine obtained from phosphines and maleic and fumaric acids redily underwent decarboxylation into the corresponding monoacyl phosphonium derivatives. The structure of the latter was established by means of X-ray crystallography. The adduct prepared from phosphines and itaconic acid was stabilized by intramolecular hydrogen bond between the acylate anionic center and the “second” carboxy group.     

Potassium and cesium thiocyanate complexes with diphenyloxa-21-crown-7: Synthesis and vibration spectra. Selective properties of dipnehyloxa-21-crown-7

Novel K and Cs complexes with diphenyloxa-21-crown-7 (2,3,5,6-dibenzo-1,4,7,10,13,16,19-heptaoxacyclo-heneicosadiene-2,5; DPO21C7) are synthesized and isolated in a solid state, and their IR spectra (4000–400 cm^–1) are studied. Only four ether O atoms of crown ether are involved in coordination. Conformation of a macrocycle in the complexes depends on the cation size. The potentiometric selectivity of diphenyloxa-21-crown-7 toward Cs⁺ ions was found to be the greatest.Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 3, 2005, pp. 163–167.Original Russian Text Copyright © 2005 by Ivanova, Dorokhov, Pyatova, Galkina, Yakshin, Tsivadze.This revised version was published online in April 2005 with a corrected cover date.This revised version was published online in April 2005 with a corrected cover date.     

New di- and tricarboxylate phosphabetaines

Russian Chemical Bulletin - New stable tricarboxylate phosphabetaines were synthesized based on 3-(diphenylphosphino)propionic acid and unsaturated dicarboxylic acids (maleic and itaconic). A new...     

Dynamics of a two-dimensional light bullet propagating in a system of carbon nanotubes with a velocity greater than the speed of light in the medium

The behavior of a two-dimensional light bullet propagating with a velocity greater than the speed of light in a medium consisting of semiconducting carbon nanotubes is investigated by means of numerical simulation. The electromagnetic field of the investigated system is described using Maxwell’s equations with allowance for the electric and magnetic properties of the carbon nanotubes and the medium in which they are embedded.     

New biologically active phosphonium salts based on 3-(diphenylphosphino)propionic acid and unsaturated amides

Russian Chemical Bulletin - New carboxylate phosphabetaines were synthesized from 3-(diphenylphosphino)propionic acid and unsaturated amides. Alkylation of the synthesized carboxylate...     

Anomalies of the photo-response and thermal boundary resistance of a YBaCuO/YSZ structure

The photoresponse of a YBaCuO/ZrO₂ bolometric structure was measured under modulated (λ = 630 nm) and pulsed (τ ≈ 7 – 8 ns; λ = 337 nm) laser excitation. The shape of the measured photoresponse was interpreted by a thermal model; nevertheless, the pulse amplitude for vanishing YBaCuO film resistance was 5–6 times greater than predicted; the thermal boundary resistance R_Bd between YBaCuO and YSZ was evaluated ? 10^?2 K × cm²/Watt, which is considerably larger than estimated theoretically for the similar situation of YBaCuO/MgO [5].