Synthesis of cancerolytic peptides

Summary New peptides containing a bis-2-chloroethylarnino group were prepared by condensing DL-3-p-(bis-2-chloroethylamino) phenyl-N-formylalanine with amino-acid esters.     

Representation of large numbers by binary quadratic forms

Sufficient conditions of representability of a given integer by a fixed binary quadratic form are presented. It is shown that almost all integers satisfy these conditions. Bibliography: 2 titles. Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 226, 1996, pp. 60–64.     

Structure and properties of 1-acylpyrazolines

Proton magnetic resonance spectroscopy and the method of dipole moments demonstrated that 1-acylpyrazolines exist primarily in the s-trans form, which is stabilized by the repulsion of like-charged nitrogen and oxygen atoms. Simultaneous reduction of the C =O and C =N bonds was observed during the action of lithium aluminum hydride on 1-formyl-and 1-trifluoroacetylpyrazolines, which is explained by the relatively high polarity of the C=N bond.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 488–491, April, 1972.     

Quantum holography upon resonant adiabatic interaction of fields with an atomic medium in a Λ-configuration

We study the quantum memory protocol for spatially multimode light based on an atomic ensemble in the Λ-configuration. We analytically solve a system of partial differential equations that describe the evolution of the medium and field for the case where the interaction time considerably exceeds the lifetime of the excited state. This time ratio makes it possible to apply the adiabatic approximation. Unlike problems aimed at storage the time profile of the signal field, we propose optimizing the relation between the writing and reading times and the optical density of the medium, which ensures a high retrieval efficiency of the quantum image.     

Synthesis and reactivity of metal-containing monomers

Optically active mixed alkoxy orthotitanates with general formula Ti(OR¹)₂(OR²)(OR³) (R¹=Et, Buⁿ; R²=CH₂CH₂OCOC(Me)=CH₂; R³=menthyl, CH(Me)CH₂Me, CH(Ph)CH(NHMe)Me, CH(C₉H₆N)(C₉H₁₄N)) were obtained for the first time by transesterification. The Ti^IV monomers synthesized were characterized by elemental analysis, ozonolysis, and¹H and¹³C NMR and IR spectroscopy. Polymer products with optical activity were obtained by liquid phase radical copolymerization of Ti^IV-containing monomers. For Part 51, see Ref. 1. Deceased. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1739–1743, September, 1999.