A. V. Astrelin

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Long-term potentiation (LTP) is the most prominent model to study neuronal plasticity. Previous studies using quantal analysis of an early stage of LTP in the CA1 hippocampal region (<1 h after induction) suggested increases in both the mean number of transmitter quanta released by each presynaptic pulse (m, quantal content) and postsynaptic effect of a(More)
'Minimal' excitatory postsynaptic potentials (EPSPs) are often recorded from central neurones, specifically for quantal analysis. However the EPSPs may emerge from activation of several fibres or transmission sites so that formal quantal analysis may give false results. Here we extended application of the principal component analysis (PCA) to minimal EPSPs.(More)
Long-term depression together with long-term potentiation represent popular experimental models to study synaptic plasticity. However, analyses of the mechanisms underlying the expression of cortical long-term depression are in their infancy and have been confined to the hippocampus. Short- and long-term depression in neocortex is not well understood. Here(More)
Minimal excitatory postsynaptic potentials were evoked in CA3 pyramidal neurons by activation of the mossy fibres in hippocampal slices from seven- to 16-day-old rats. Conditioning intracellular depolarizing pulses were delivered as 50- or 100-Hz bursts. A statistically significant depression and potentiation was induced in four and five of 13 cases,(More)
A statistical approach to analysis of amplitude fluctuations of postsynaptic responses is described. This includes (1) using a L1-metric in the space of distribution functions for minimisation with application of linear programming methods to decompose amplitude distributions into a convolution of Gaussian and discrete distributions; (2) deconvolution of(More)
This chapter considers methods for measurements of postsynaptic responses and simple approaches to the estimation of parameters of quantal release in synapses of the central nervous system of vertebrates. The use of these methods is illustrated by the analysis of single-fibre and "minimal" monosynaptic postsynaptic potentials (PSPs) or currents (PSCs)(More)
In the report by M. Singer (USA) read at Moscc)w University in October 1989 the following problem ‘was formulated: for differential operator D = Pa~z + Q a% to find such integer Ii, that any irreducible polynomial ~ dividing D$ has degree deg ~ < 1{. This problem arises when we want to find the symbolic solution of a differential equation ~ = R(z, y) where(More)
This paper continues the study of the relationship between Gröbner bases and involutive bases of polynomial ideals started in [1, 5]. Involutive bases are considered as Gröbner bases with some fixed normal form algorithms. It is shown that once the search order of critical pairs is coordinated, the sameS-elements and their reductions appear in the same(More)
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