Digitalis purpurea pharmacological forms, extracts of this plant did not frequently cause intoxication because they induced nausea and vomiting within minutes of ingestion, preventing the patient from consuming more. The main toxins in "Digitalis" spp. are the two chemically similar cardiac glycosides: digitoxin and digoxin. Like other cardiac glycosides, these toxins exert their effects by inhibiting the ATPase activity of a complex of transmembrane proteins that form the sodium potassium ATPase pump, (Na/K-ATPase). Inhibition of the Na/K-ATPase in turn causes a rise not only in intracellular Na, but also in calcium, which in turn results in increased force of myocardial muscle contractions.
Where Do We Go from Here? (1945 film) cuts were made in his proposed score for "Where Do We Go from Here", most of his work with Ira Gershwin remains, including a lengthy mock-opera bouffé aboard Columbus' ship during which the crew threatens to mutiny. Co-stars June Haver and Fred MacMurray met while working on this film, and were later married. "Where Do We Go from Here?" has never been released on home video. A recording taken directly from the soundtrack of the film was released on LP (Ariel KWH 10) and a set of rehearsal recordings performed by Kurt Weill and Ira Gershwin is currently available on