[Effect of excretion-secretion products of some fouling species on the biochemical parameters of blue mussel Mytilus edulis L. (Mollusca: Bivalvia) in the White Sea].

The effect of excretion-secretion products (ESP) of five abundant fouling invertebrate species (bivalve mollusks Hiatella arctica and Mytilus edulis, solitary ascidia Styela rustica, sponge Halichondria panicea, and sea starAsterias rubens, inhabiting the White Sea) on the biochemical status of blue mussel M. edulis was assessed by the dynamics of lysosomal enzymes activity (nucleases, glycoside hydrolases, and cathepsins). ESP of conspecific species had no effect on the metabolism of the mollusks of this species. ESP of A. rubens, S. rustica, and H. panicea activated the same enzymes. First, acid RNase and glycoside hydrolases activity increased, but in different ways. The metabolites of H. arctica affected the activity of proteometabolism enzymes.

[Effect of dietary intoxication by mercury salts on cysteine proteinase activity in rat tissues]. / Vliianie pishchevoi intoksikatsii soliami rtuti na aktivnost' tsisteinovykh proteinaz v tkaniakh krys.

The experiments on dietary intoxication of rats by HgI2 or Hg(NO3)2 show that the activities of lysosomal proteinase cathepsin B and cytosolic Ca(2+)-activated proteinases (calpains I and II) in the liver and kidney depend on the mercury salt solubility and the exposure duration. Mercury iodide and nitrate contribute more to inhibiting cathepsin B and calpains activities in the above tissues, respectively.

[Biochemical characterization of aeromonad strains differing in pathogenicity]. / Biokhimicheskaia kharakteristika raznykh po patogennosti shtammov aéromonad.

A virulent strain of motile aeromonad (77-18) and an avirulent strain (78-16) differed in the contents of lipids and phospholipids, odd fatty acids, activity of hydrolytic enzymes, and amount of proteins with molecular weights of 47-56 kDa. It is assumed that proteins with molecular weights of 47-56 kDa, proteolytic enzymes active within a wide pH range, and odd fatty acids may act as pathogenicity factors. Each of these compounds or their combination determines certain stage of infection.

[Comparative study of various biochemical parameters in pathogenic and nonpathogenic Aeromonas strains]. / Sravnitel'noe izuchenie nekotorykh biokhimicheskikh pokazatelei u patogennogo i nepatogennogo shtammov aéromonad.

We studied certain biochemical properties of virulent and avirulent strains of mobile aeromonads. The pathogenic strain featured a higher proportion of odd fatty acids in the lipids, increased protease activity, and a high concentration of 55 kDa protein. We propose that these compounds be used as pathogenic markers of these microorganisms.

[Activity of lysosomal proteinases in carb tissue in aeromonas infection]. / Aktivnost' proteinaz lizosom v tkaniakh karpa pri aéromonoze.

The activity of major lysosomal proteinases (cathepsins B and D) increased in carp tissues infested with Aeromonas hydrophila. The value and character of changes in the activity of cathepsins depended on the degree of infestation and the physiological state of fishes (normally fed or starved).

[Changes in the activity of trout lysosomal enzymes during fasting]. / Izmenenie aktivnosti fermentov lizosom u foreli pri golodanii.

Activity of lysosome enzymes (acidic phosphatase, beta-glucosidase, DNAase, RNAase and cathepsin D) is determined for its variation in different organs of rainbow trout during complete fasting. It is shown that the activity of most enzymes of concern almost in all organs except skeletal muscles is on the higher level in trouts fasted for 30 days than in the control ones. With an increase of the fasting term to 60 days the acid phosphatase, DNAase, RNAase activity decreases while the glucosidase and cathepsin D activity in some organs increases. Variations detected in the enzyme profile of the trout lysosomes under fasting are of adaptive character.