Sergey D. Varfolomeev

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Genetically expressed fluorescent proteins have been shown to provide photoacoustic contrast. However, they can be limited by low photoacoustic generation efficiency and low optical absorption at red and near infrared wavelengths, thus limiting their usefulness in mammalian small animal models. In addition, many fluorescent proteins exhibit low(More)
UNLABELLED Universal ontology of catalytic sites is required to systematize enzyme catalytic sites, their evolution as well as relations between catalytic sites and protein families, organisms and chemical reactions. Here we present a classification of hydrolases catalytic sites based on hierarchical organization. The web-accessible database provides(More)
The MEGA-PRESS pulse sequence was used for determination of overlapping signals in the 1H-MRS spectra of the human brain. For the first time, the balance of GABA glutamate/glutamine concentrations was estimated quantitatively in the human brain of patients with ultra-high risk of schizophrenia. It was found that GABA concentration and GABA/GLX ratios were(More)
Covalent SK-PEG2 and SK-PEG5 conjugates with various degrees of modification of the protein amino groups were obtained by variation of the duration of streptokinase (SK) incubation with activated polyethylene glycol (M 2 and 5 kDa, PEG2 and PEG5); their properties were studied in comparison with the properties of unmodified SK in vitro. SK-PEG2 and SK-PEG5(More)
1H-magnetic resonance spectroscopy revealed that apparently normal (from the data of magnetic resonance imaging) human brain frontoparietal cortex in the subacute stage of traumatic brain injury is characterized by decreased level of N-acetylaspartate (NAA) and increase in levels of myoinositol, choline-containing compounds (Cho), and(More)
The neuroprotective effect of choline succinate was studied in rats with chronic cerebral ischemia induced by ligation of both common carotid arteries. Two approaches were used to evaluate the neuroprotective effect: cognitive ability tests (passive avoidance test and Morris water maze test) and determination of the brain content of N-acetylaspartate, a(More)
A kinetic analysis of the delta-opiate receptor agonist, [3H] DADLE, binding to cell (NG108-15) suspensions has led to the discovery of a new periodic biological phenomenon, namely, receptor activity oscillations. The absence of oscillations for the antagonist binding to the receptors suggests that oscillations are generated only as a result of receptor(More)
The interaction of the selective mu-ligand [D-Ala2, MePhe4, Glyol5]enkephalin (DAMGO) and the selective delta-ligand [D-Ser2, Leu5, Thr6]enkephalin (DSLET) with the binding sites in rat brain cortex membranes, has been studied. Analysis of the binding isotherms in the presence and absence of nonlabelled DAMGO and DSLET revealed that these ligands can(More)
The study of the kinetics of binding of the opiate receptor agonist [3H]DADLE with NG108-15 cell suspensions has revealed a new periodic biological phenomenon, i.e., oscillations of the cellular receptor activity. The absence of oscillations for binding of the receptor antagonist shows that oscillations occur as a result of the transformation of the(More)