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.
Toxicity Of Essential Oils. Certain constituents of essential oils are very toxic, particularly to vulnerable people like the old, the very young, and pregnant women. On the whole, this toxicity of essential oils applies to an oil when taken internally, which is something I am passionately against. Certain of these toxins in certain oils can be dangerous when applied externally (or inhaled), and I have given clear warnings where necessary throughout the book.