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.
Safety assessments of bisphenol A (BPA) conclude that the potential human exposure to BPA from polycarbonate plastics and epoxy resins is more than 400 times lower than the safe level of BPA set by the U.S. Environmental Protection Agency. This minimal level of exposure to BPA poses no known risk to human health.