María Soledad Michiels

National University of Mar del Plata | UNMDP · Departamento de Biología

The knowledge about the occurrence and biochemical characteristics of key digestive enzymes is crucial for an enhanced understanding of the dietary ecophysiology of the species. On the other hand, integrative studies on digestive physiology and on tissue content of glycogen, glucose, lipid and protein in groups of ecological and economic importance...

En individuos expuestos a alteraciones de las variables ambientales del medio externo en el que habitan, el mantenimiento de parámetros bioquímico-fisiológicos es fundamental para el correcto funcionamiento del organismo. El género Hydra, perteneciente al phylum Cnidaria, representa un modelo biológico adecuado para analizar los mecanismos involucr...

This study analyses body condition and digestive/metabolic parameters of Odontesthesargentinensis from Mar Chiquita Coastal Lagoon (MChCL) during different ovary maturity phases (II: developing; III: spawning capable; IIIas: actively spawning subphase). Silverside individuals in phases II and III maintained their body condition, while it improved i...

Integrative studies are lacking on the responses of digestive enzymes and energy reserves in conjunction with morphological traits at distinct postprandial times in marine estuarine‐dependent flatfishes of ecological and economic importance, such as Paralichthys orbignyanus. We determined total weight (TW), hepato‐somatic index (IH), activities of...

The hepatopancreas of decapod crustaceans is an organ which can act as indicator for digestive and metabolic parameters under different physiological and / or environmental conditions. However, biochemical studies on digestive and metabolic parameters of the hepatopancreas of euryhaline burrowing crabs such as Neohelice granulata from habitats with...

The study of different physiological aspects of the digestive tract (i.e., components involved at the biochemical level and mechanisms of modulation) is extremely relevant for the integrated knowledge of the functioning of living organisms. Digestive enzymes play an essential physiological role as a link between ingestion, absorption, and assimilat...

Modulation of aminopeptidase N (APN) activity in the digestive tract by various factors would be important to adjust digestive and absorptive processes under different physiological and (or) environmental conditions. We studied the postprandial responses at different salinities and the effect of abscisic acid (ABA) and extracellular Ca²⁺ on APN act...

No studies are available about biochemical characteristics and modulation (i.e. by endogenous and/or environmental cues) of trypsin (a key digestive endoprotease) in hepatopancreas of intertidal euryhaline crabs neither on the possible concomitant modulation of key ectoproteases such as aminopeptidase-N (APN) involved in final steps of protein dige...

The flounder Paralichthys orbignyanus that spans from Rio de Janeiro (Brazil) to San Matías Gulf, Argentina has an important ecological role and a great potential use for aquaculture. However, studies on its digestive physiology (i.e. occurrence of digestive enzymes) as well on energy reserves content in metabolic tissues are lacking. We determined...

Strikingly, in spite of its physiological importance, information about occurrence, biochemical characteristics and mechanisms of regulation of aminopeptidase-N (APN) in the hepatopancreas of intertidal euryhaline crabs is still lacking. In this work, we determined the occurrence, biochemical characteristics, response to environmental salinity and...

We studied the biochemical characteristics and modulation by dopamine, glucagon and cAMP of lipase activity in hepatopancreas of the euryhaline crab Neohelice granulata (Dana, 1851), considered to be an emergent model for biochemical, physiological and ecological research. Lipase activity was maximum at pH 8.5; it exhibited Michaelis-Menten kinetic...

This study constitutes a first attempt to investigate intraspecific differences in osmoregulatory capacity and digestive and metabolic responses at the biochemical level in relation to hyper- and hypo-regulation in a single species of estuarine crab inhabiting contrasting habitats within a same intertidal area. We compared hemolymph osmolality, key...

We studied the occurrence and characteristics of lipase activity and the response of lipase and proteolytic activity to salinity and dopamine injections in hepatopancreas of the euryhaline crab (Cyrtograpsus angulatus). Lipase activity was maximal at pH 8.5; it exhibited Michaelis-Menten kinetics (apparent K-m=0.019 mM), was higher at 37 degrees C...