(full paper is archived in the Miller Library)
Title: Cardioactive substances in the salivary glands and the hypobranchial gland secretion of the marine gastropod, Nucella emarginata
Student Author(s): Smith, Peter A.
Faculty Advisor(s): Fuhrman, Fred
Location: Final Papers Biology 175H
Date: June 1979
Keywords: midtide forest community
Abstract: 1) Salivary glands of the marine carnivorous snail Nucella emarginata contain a substance which causes positive chronotropic and ionotropic effects on the hearts of Mercenaria mercenaria and Mytilus californianus. 2) Comparison of the effects of salivary gland homogenate with the action of known doses of serotonin (5HT) on Mytilus hearts showed the glands contain the equivalent of 23-85 ug. 5HT/g. fresh tissue. Thin layer chromatography demonstrated that the glands contain less than 150 ug. 5HT/g. fresh tissue. 3) Mucous secreted from the hypobranchial gland of Nucella caused a marked increase in tonus and eventual cessation of beat of Mytilus hearts, effects similar to those produced by large concentrations of acetylcholine.