Fluorescence of styryl dyes-DNA complexes induced by single- and two-photon excitation.

The series of novel monomer and homodimer styryl dyes based on (p-dimethylaminostyryl) benzothiazolium residues were synthesized and studied as possible fluorescent probes for nucleic acids detection. Spectral-luminescent and spectral-photometric properties of obtained dyes in the unbound state and in DNA presence were studied. Fluorescence emission induced by two-photon excitation of dye-DNA complexes in aqueous buffer solution was registered.

Luminescent determination of automobile petrol in hexane solutions.

The work deals with the problem of determination of automobile petrol of various octane numbers and petroleum contamination of some objects on the basis of analysis of photoluminescence spectra of automobile petrol samples. For this purpose steady state luminescence properties of samples of automobile petrol of different types being in sale were measured. Samples of automobile petrol diluted in hexane were prepared and their luminescence spectra were measured at room and liquid nitrogen temperatures of samples.

Records of Chrysomya albiceps in the Ukraine.

First records of the presence of the blowfly, Chrysomya albiceps in the western and northern Ukraine are presented.

A new test method for the evaluation of total antioxidant activity of herbal products.

A new test method for measuring the antioxidant power of herbal products, based on solid-phase spectrophotometry using tetrabenzo-[b,f,j,n][1,5,9,13]-tetraazacyclohexadecine-Cu(II) complex immobilized on silica gel, is proposed. The absorbance of the modified sorbent (lambda(max) = 712 nm) increases proportionally to the total antioxidant activity of the sample solution. The method represents an attractive alternative to the mostly used radical scavenging capacity assays, because they generally require complex long-lasting stages to be carried out.

[A new electrometric approach to studying specific biomolecular complexes].

In the article the results of the influence of some types of biological molecules and their specific immune complexes on the volt-amperic characteristics of surface-barrier contact structures with the super thick metal film are presented. Moreover, the possibility to develop on this basis a simple instrumental method for separate registration of initial components and products of their interaction is discussed. It was shown that the volt-amperic characteristics of surface-barrier structures of Ni-Si changed at the deposition of myoglobin and its specific monoclonal antibodies.

[Post-radiation changes in cyclic nucleotide levels and cAMP and cGMP in chromatin from rat blood lymphocytes].

The change of contents of cyclic nucleotides (cAMP and cGMP) in lymphocyte chromatin of rats blood under norm and after X-ray irradiating in doses 0.5; 1 and 7.76 Gy was established.

[Inhibition of proteolysis of nuclear histones by metal ions].

3-5 hours incubation of calf thymus nuclei at 37 degrees C leads to the proteolysis of histones H1, H3 and H2B; 1-10 mM NiCl2 and ZnSO4 inhibits the proteolysis of the histones H1, H3 and H2B.

[Adaptive changes of chloroplast membrane lipid components under environmental factors].

Review deals with some modern views of the membrane chloroplast lipid composition role in low-, high temperature and water stress adaptive reactions. It is shown that the transformed changes in membrane lipid composition determined the biochemical adaptive process due homeostasis support and preservation of the lipid bilayer fluidity, being necessary for their normal functioning in the changed environmental conditions. The aspects of long-term and short-term adaptive reactions in protein/lipid membrane complexes is discussed.