Letâs look at ferns as an example of alternation of generations. The fern plants you see out in the woods, or in a garden, or by a river are sporophytes. They produce spores. If you turn over a fern frond (thatâs just a fancy word for leaf), sometimes youâll see little circles all over the underside of the leaf.
Tricyclic Antidepressant (TCA) Overdose. California Poison Control 1-800-876-4766. Pediatric considerations. Low toxicity threshold of TCAs. Therapeutic doses range from 2-4 mg/kg/d. Toxicity is observed at doses of 10-20 mg/kg. Ingestion of only two 50-mg tablets in a 10-kg toddler can be sufficient. to produce symptoms of toxicity.
Tricyclic antidepressants (TCAs) are chemical compounds used primarily as antidepressants. TCAs were first discovered in the early 1950s and marketed later in the decade. They are named after their chemical structure, which contains three rings of atoms.Tetracyclic antidepressants (TeCAs), which contain four rings of atoms, are a closely related group of antidepressant compounds.he TCAs were developed amid the explosive birth of psychopharmacology in the early 1950s. The story begins with the synthesis of chlorpromazine in December 1950 by Rhone-RhÃ´ne'poulenc s chief, Chemist Paul, charpentier from synthetic antihistamines developed By-Rhone rhÃ´ne poulenc in. the 1940s