Histology, histochemistry and enzyme biochemistry of the digestive glands in the tropical surf barnacle Tetraclita squamosa

Autor:	David Yellowlees, D. J. Johnston, C. G. Alexander
Rok vydání:	1993
Předmět:	chemistry.chemical_classification Proteases Ventriculus Apocrine Histology Foregut Aquatic Science Biology medicine.anatomical_structure Enzyme stomatognathic system Biochemistry chemistry medicine Secretion Duct (anatomy)
Zdroj:	Journal of the Marine Biological Association of the United Kingdom. 73:1-14
ISSN:	1469-7769 0025-3154
DOI:	10.1017/s0025315400032616
Popis:	The tropical surf barnacle Tetradita squamosa (Bruguière) (Crustacea: Cirripedia) has a pair of lobulate digestive glands each connected to the dorsal surface of the foregut by a single duct. These glands have a central lumen surrounded by columnar epithelial cells and are the primary site of enzyme synthesis and secretion within the alimentary tract. A number of carbohydrases and proteases were detected, all of which exhibited optimal activity at an acidic pH. Gland cells discharge secretory products into the foregut ventriculus via apocrine secretion and this process is continuous; it is not correlated with tidal and subsequent feeding cycles. Possible reasons for the absence of feeding and secretory co-ordination are discussed.
Databáze:	OpenAIRE
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