Vladimir Arkhipov

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Cognitive processes and functional state of mitochondria in brain structures of Wistar rats were studied after intrahippocampal injection of kainic acid, an agonist of glutamate receptors. A single administration of 0.25 microg kainic acid into the dorsal part of the left and right hippocampi affected task retrieval and decreased inhibition of unrewarded(More)
The phenomenon of dissociated memory retrieval is observed when some influences (for example, pharmacological) on the brain result in specific changes of long-term memory. The purpose of present paper is to reveal possibilities of the phenomenon for study of long-term memory retrieval. Pharmacologically-induced dissociated states could be identified when(More)
The effects of the neurotoxin kainic acid on a food-producing habit were studied in Wistar rats in an experimental chamber. Single doses of kainic acid at a subconvulsive dose (8 mg/kg, i.p.) were found to impair the habit, onset of impairment being delayed by several weeks rather than immediate. Conversely, administration of the neurotoxin at the(More)
Male Wistar rats were trained with a food rewarded task and treated with single convulsive dose of picrotoxin. Behavioural test for response extinction by non-reinforcement procedure, which was considered as inhibitory learning, was performed 1, 2, 5, or 7 days after the treatment. The results obtained showed that 5 days after seizures, the animals(More)
Delayed disturbances of cognitive functions caused by intrahippocampal injection of subconvulsive dose of kainic acid were studied in rats. Animals were behaviorally tested for the presence of cognitive deterioration 1 week after bilateral injection of 0.25 microg kainic acid into the left and right hippocampi. Behavioral tests included the retrieval of a(More)
Lipid composition of homogenate and neuronal and glial nuclei of the brain cortex of Wistar rats was studied under normal conditions and after seizures induced by injection of picrotoxin. Seizures increased contents of lysophosphatidylcholine, sphingomyelin, and total phospholipids in the homogenate. In neuronal nuclei contents of total phospholipids,(More)
The stage of retrieving long-term memory traces is discussed; studies of this stage can be performed using the phenomenon of dissociated brain states. These states arise in response to various external influences and are accompanied by selective, reversible derangements of retrieval processes without alteration of the mechanisms involved in perceiving and(More)
In vitro protein phosphorylation of synaptic membranes isolated from neocortex and hippocampus of ground squirrels was studied. Three functional states of animals were investigated: torpid, awakened and active normothermic. Phosphorylation of a protein with a mol. wt of 53 kDa was independent on the functional state of the animals. Incorporation of 32P into(More)
A simplified derivation for the ratio of macroscopic to microscopic relaxation times of polar liquids is based on the Mori–Zwanzig projection-operator technique, with added statistical assumptions. We obtain several useful forms for the lifetime ratio, which we apply to the dynamics of liquid water. Our theoretical single-molecule relaxation times agree(More)
The expression of mitochondrial protein UCP2 and cytochrome C-oxidase subunit III genes in the hippocampus and prefrontal cortex was evaluated by real-time PCR 3 and 7 days after microinjection of kainic acid into the dorsal hippocampus. In contrast to cytochrome C-oxidase subunit III mRNA, the level of UCP2 mRNA in the hippocampus increased 1 week after(More)