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P I Ivanov

Publications and source records attributed to P I Ivanov.

15 recordsLinked to original sources
PubMed2003

Study of the 111In-DTPA complex by the electromigration method.

The electrophoretic behavior of the 111In-DTPA radiopharmaceutical has been investigated. The stability constant, diffusion coefficient and effective charge of the complex as well as the temperature dependence of the electrophoretic mobility were determined. No-carrier-added 111In with high specific activity was used in the electrophoretic experiments in ultramicroconcentrations (10(-9)M).

Data Interpretation, Statistical↗
PubMed1994

Tubular structures of Mycoplasma gallisepticum and their possible participation in cell motility.

In five strains of Mycoplasma gallisepticum, a protein with a molecular mass of about 40 kDa was detected by immunoblotting with anti-pig brain tubulin polyclonal and monoclonal antibodies. In eight other mycoplasma species similarly tested no reaction was observed. Thin serial sections of M. gallisepticum and Acholeplasma laidlawii cells examined by transmission electron microscopy revealed a submembrane system of tubules in M. gallisepticum but not in A. laidlawii. The intracellular spatial distribution of the tubular structures was reconstructed. Thin sections of M. gallisepticum treated with anti-tubulin antibodies and colloidal gold particles (immunogold labelling) revealed distinct labelling of the tubular system. Analysis of the tubular structures by high resolution electron microscopy and optical diffraction showed their helical organization to be: diameter 40 nm, helix pitch approximately 20 nm and electron-transparent core 10 nm in diameter. A possible involvement of the tubular system in mycoplasma motility is suggested.

Animals↗
PubMed1992

[Tubular structures in Mycoplasma gallisepticum and the localization of a tubulin-like protein].

In all the strains of M. gallisepticum investigated, a protein with apparent molecular weight 40 kDa was revealed by immunoblotting with polyclonal anti-calf brain tubulin antibodies and monoclonal anti-chicken alpha-tubulin antibodies. In other 8 investigated Mycoplasma species no positive reactions with the same antibodies were found. The M. Gallisepticum cells were examined under electron microscope on fine serial sections and on some sections going at different angles to the long cell axis. Undermembrane system of tubules was revealed and the intracellular pattern of the tubular structures were reconstructed. The immunoelectron microscopic data suggest that tubulin-like protein may be included into the structures.

Acholeplasma laidlawii↗
PubMedDate not supplied

[Neurophysiologic analysis of the critical period of delay of a reinforcing stimulus in the dog].

At interval of less than 100 ms between indifferent sound and unconditioned electrocutaneous stimulation, classical defensive conditioned reflex is not elaborated in dogs, in full correspondence with literature data. But intracortical temporary connection is established; this fact is shown by electrographic phenomena, the most specific and demonstrative among them is "conditioned evoked potential". The absence of behavioural (peripheral) and presence of electrographic (central) manifestations allow to assume that for the formation of the conditioned reflex of full value the involvement is necessary of additional activational (motivational) mechanisms, connected with reticular and (or) limbic subcortical structures which do not react to the conditioned stimulus at time deficit in conditions of microdelay.

Animals↗