[The modification of method of erythrograms in patients under chronic hemodyalisis using hardware-controlled administration of laser low-angle light scattering].

The detailed analysis of structural characteristics of erythrocytes can be implemented with method of erythrograms. However its practical application in conditions of medical laboratory is a long and labor-intensive process of little avail for express-diagnostic. To register alterations of morphologic functional characteristics of erythrocytes in patients under chronic dialysis as compared with patients without renal pathology the new technique of low-angle light scattering never applied before for this purpose.

[Solid phase reaction of hemoglobin with spillover hydrogen].

The reaction of high-temperature solid-state catalytic isotope exchange (HSCIE) between bovine hemoglobin and spillover hydrogen (SH) was studied. It was shown that, in the field of subunit contact, there is a significant decrease in ability for hydrogen exchange by SH. A comparison of the distribution of the isotope label in the hemoglobin alpha-subunit was carried out for the HSCIE reaction with the hemoglobin complex and with the free alpha-subunit.

[Solid phase isotope exchange with spillover hydrogen in amino acids, peptides, and proteins].

We summarize here information on the theoretical and experimental study of high-temperature (150-200 degrees C) solid phase catalytic isotope exchange (HTSPCIE) carried out with amino acids, peptides, and proteins under the action of spillover hydrogen. Main specific features of the HTSPCIE reaction, its mechanism, and its use for studying spatial interactions in polypeptides are discussed. A virtually complete absence of racemization makes this reaction a valuable preparative method.

[Study of solid-phase catalytic isotopic exchange of hydrogen in alpha-conotoxin G1 under the effect of spillover-tritium].

Tritium-labeled alpha-conotoxin G1 with a molar radioactivity of 35 Ci/mmol and full biological activity (according to the binding to nicotinic acetylcholine receptor) was obtained by the high-temperature solid-state catalytic isotope exchange (HSCIE). The tritium distribution in the molecule of alpha-conotoxin G1 was revealed by 3H NMR spectroscopy. Tritium was found in all amino acid residues except for the Asn4-Pro5-Ala6 fragment.

[The use of ion-selective field transistors (ISFT) with photopolymerizable polyurethane membranes in nephrology for determination of potassium concentration (activity)].

The applicability is examined of ion selective field transistors with photocurable polyurethane membranes to control of the electrolytic composition of dialyzing solutions used in artificial kidney apparatus, and also of plasma in patient treated by chronic hemodialysis. The short- and long-time characteristics of the efficiency of K(+)-selective field transistors in continuous contact with solutions. Comparative testing of such transistors and other sensing systems is made.

[Na+ and K+ ion transport across the human erythrocyte membrane during the formation of nystatin channels under in-vitro conditions: the characteristics and an analysis of the processes].

The kinetic properties (the spontaneous lysis velocity, the time of achievement, and the concentration level of the stationary stage) are shown to be strongly different, while the human erythrocytes are resuspended in various salt media. The analysis of Na+ and K+ concentrations, under the effect of a polyene antibiotic nistatin, on the human erythrocytes as an integral kinetic function of time is carried out. The processes engaged in this kinetic function are characterized.

[An ionometric study of Na+ and K+ fluxes across the nystatin-modified human erythrocyte membrane].

The application of ion-selective electrodes is discussed for the kinetic determination of K+ and Na+ concentrations in the system, containing human red blood cells modified by nystatin. A series of mixed solutions was worked out, according to which the Na(+)-glass and the K(+)-thick membrane valinomycin electrodes were calibrated. The human erythrocytes were washed for 3 times with the basic solution (in mol per liter: 0.