Solar neutrinos in models involving an extended Higgs sector

Neutrino oscillations in matter and in a magnetic field are investigated within models involving an extended Higgs sector. The left-right model containing a bidoublet and two triplets of Higgs fields (LRM) and the general two-Higgs-doublet model (GTHDM) are chosen by way of example. It is shown that the interaction of leptons with physical Higgs bosons can substantially change the pattern of oscillations in these models in relation to the predictions of the Standard Model (SM). Upper limits on the Yukawa coupling constants and on the Higgs boson masses are found in order to obtain maximum corrections to the SM solar-matter potential V ^SM. By using constraints on these parameters from the literature and those that are obtained here, it is possible to estimate corrections to V ^SM that come exclusively from charged Higgs bosons. The maximum value of these corrections is 40% of V ^SM within the LRM and 10% of V ^SM within the GTHDM. The entire body of information about the contributions of physical Higgs bosons to the solar-matter potential can be obtained by studying the Lorentz structure of the amplitudes for the reactions e ^? ν _l → e ^? ν _l′ at low energies.     

Synthesis and physiological activity of new organophosphorus pesticides of 1,3,2-oxazaphosphorinane series

Methods for the synthesis of 2-aryloxy(arylthio)- and 2-alkoxy(alkylthio)-2-thio(oxo)-1,3,2-oxazaphosphorinanes and theirN-substituted derivatives based on the reactions of the corresponding dichlorophosphates, dichlorothio-, and dithiophosphates with 3-aminopropan-1-ol or its substituted derivatives in the presence of Et₃N or aqueous alkali under phase transfer catalysis conditions, as well as by the reaction of the tetramethylammonium salt of 2-hydroxy-2-thio-1,3,2-oxazaphosphorinane with alkyl- and acyl halides, by that of 2-chloro-2-thio-1,3,2-oxazaphosphorinane with sodium thiolates, and by other methods, were developed. The compounds obtained exhibit high nematocide activity but low toxicity for mammals. Some active synergists for permethrine were found among these compounds.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2241–2249, November, 1995.This study was financially supported in part by the International Science Foundation (Grant Nos. NDO 000 and NDO 300) and by the Russian Foundation for Basic Research (Grant No. 93-03-0451). The authors are grateful for this support.     

Synthesis and biological activity of some 1,3,2-diheteraphosphorinanes and their acyclic analogs

Methods were developed for the synthesis of 2-butylthio-2-oxo-1,3,2-oxazaphosphorinane, 2-butylthio-2-thioxo-1,3,2-dioxaphosphorinane, and 2-butylthio-2-thioxo-1,3,2-diazaphosphorinane, as well as of acyclicS-butylO-ethyl (diethylamido)phosphorothioates and-dithioates andS-butyl bis(diethylamido)phosphorodithioate. These compounds can serve as models of possible metabolites of cyclic compounds. Based on the data obtained in studies of the antiesterase activity of the resulting compounds and their synergistic activity in mixtures with permethrine, a possible mechanism ofin vitro andin vivo biological action of diheteraphosphorinanes was proposed.     

Shock compressibility of porous tungsten,molybdenum, copper,and aluminum in the low pressure domain

Results are presented of an experimental study of the behavior of four porous metals, tungsten, molybdenum, copper, and aluminum with an initial density corresponding to ≈30 and 50% of the density of the continuous (solid) material under loading by shocks with intensity between 10–800 kbar. The behavior of the shock compression curves in the p-? plane shows that for some pressure p* the compression of the porous substance to the state of a continuous material is completed. At initial densities ≈50% of the continuous substance, the values are p^*=65, 40 and 35 kbar, respectively, for W, Mo, and Cu. At lesser densities (≈30% of the density of the continuous substance), the values of p* are approximately halved as compared with those mentioned. The state of complete packing of the porous material into a monolithic solid was not determined in aluminum in the pressure range examined 6.5–200 kbar.     

Synthesis and physiological activity of trialkyl phosphorothioates and trialkyl phosphorodithioates containing fragments of N-acylated amino acids

A series of S-[N-acyl-N-(alkoxycarbonylalkyl)aminomethyl] O,O-dialkyl phosphorothioates and -dithioates were prepared by the reactions of the corresponding alkali salts of dialkyl phosphorothioates or dialkyl phosphorodithioates with esters of N-acyl-N-(chloromethyl)glycine or N-acyl-N-(chloromethyl)--alanine and by the reactions of dialkylphosphorothioic or dialkylphosphorodithioic acids with N-acylated amino acids or their esters and paraformaldehyde in the presence of gaseous HCl. Some of the resulting compounds proved to be active permethrine synergists.     

Optically active polyamidoimides based on amino acids containing cyclohexane fragment

New amino carboxylic acids containing a cyclohexane fragment and an L-leucine or L-valine fragment were synthesized. The reactions of the synthesized amino acids with 4,4′-oxydiphthalic anhydride gave in quantitative yields the dicarboxylic acids, which were converted to the corresponding dichlorides. Low-temperature polycondensation of the synthesized dichlorides with 4,4′-diaminodiphenyl ether yielded optically active polyamidoimides, which are soluble in various organic solvents and exhibit enhanced heat resistance. The structures of the synthesized monomeric compounds and polymers were confirmed by elemental analysis, IR and ¹H NMR spectroscopy, and high-resolution mass spectrometry. Specific rotation angles of the synthesized amino carboxylic acids and polyamidoimides were determined.