caa a22 4500 445296232 CHVBK 20180317142542.0 cr unu---uuuuu 170323e20100501xx s 000 0 eng 10.1134/S0032945210040077 doi (NATIONALLICENCE)springer-10.1134/S0032945210040077 Investigation of some characteristics of enzymes effecting the process of membrane digestion in the paddlefish Polyodon spathula [Elektronische Daten] [A. Nevalennyy, D. Bednyakov, V. Novinskii] For the first time, a complex investigation of characters of some enzymes effecting the membrane hydrolysis of food in the paddlefish Polyodon spatula is made. The zone of optimum values of temperature of alkaline phosphatase, maltase, and casein-lytic proteinases of the intestinal mucosa is determined within the range from 50 to 60°C, in α-amylase it is shifted towards lower temperatures—10-30°C. A high thermal stability is noted in all investigated enzymes. The maximum level of activity for α-amylase, alkaline phosphatase, and maltase of the intestinal mucosa in the paddlefish Polyodon spatula is within pH 7-9, 9-10, and 6-8, respectively; for casein-lytic proteinases the optimum is at pH 11. In the paddlefish Polyodon spatula, the interaction of nutrients and enzymes of the intestinal mucosa may cause a significant change in the activity level of the enzymes. Pleiades Publishing, Ltd., 2010 the paddlefish nationallicence digestive enzymes nationallicence temperature nationallicence pH nationallicence activity level of enzymes nationallicence modifiers nationallicence Nevalennyy A. Astrakhan State Technical University, Astrakhan, Russia aut Bednyakov D. Astrakhan State Technical University, Astrakhan, Russia aut Novinskii V. Astrakhan State Technical University, Astrakhan, Russia aut Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/4(2010-05-01), 342-346 0032-9452 50:4<342 2010 50 11489 https://doi.org/10.1134/S0032945210040077 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0032945210040077 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nevalennyy A. Astrakhan State Technical University, Astrakhan, Russia aut NATIONALLICENCE 700 1- Bednyakov D. Astrakhan State Technical University, Astrakhan, Russia aut NATIONALLICENCE 700 1- Novinskii V. Astrakhan State Technical University, Astrakhan, Russia aut NATIONALLICENCE 773 0- Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/4(2010-05-01), 342-346 0032-9452 50:4<342 2010 50 11489 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer