Biomedical subjects
Publications and source records attributed to J D Gómez.
A 49-year-old man was hospitalized for precordial pain. The result of a resting electrocardiograph was normal. Tc-99m tetrofosmin stress myocardial imaging was performed and uptake in the area of the left scapula was seen. The abnormality was caused by a subcutaneous tumor. Histologic examination revealed a hibernoma.
Aqueous suspensions of fruit's pericarp, leaves, root's bark and seeds of Guaiacum officinale were tested at different concentrations as molluscicide, cercaricide and piscicide. In the laboratory the suspension of fruit's pericarp produced 100% mortality for egg masses of B. glabrata at 100 ppm, for adult snails of Biomphalaria glabrata, B. straminea and B. tenagophila at 20 ppm, for Lebistes reticulatus (fishes) at 5 ppm and Schistosoma mansoni's cercariae at 1 ppm. The ethanolic extract of fruit's pericarp was not active against adult snails of B. glabrata. The lethal dose for adult snails(DL90) of the aqueous suspension of fruit's pericarp after 24 hours exposure, were: 15 ppm for B. glabrata; 14 ppm for B. straminea and 18 ppm for B. tenagophila. The DL90 of aqueous suspensions of root's bark, seeds and leaves were 57 ppm, 33 ppm and 15 ppm, respectively. In the field, B. glabrata adult snail mortality was 68% at 20 ppm and 100% at 40 ppm, when using suspension of fruit's pericarp.
This paper reports the results of a preliminary study of the mollusk-killing properties of guayacil, a raw extract of the plant Guayacum officinalis, on Biomphalaria glabrata. Mollusks are exposed to several concentrations of the substance for periods ranging from 1, 6, and 24 hours and then were allowed to recover, according to the recommendations of the World Health Organization. The results indicate that guayacil has molusk-killing properties with an LC50 of 0.45 ppm and an LC90 of 0.95 ppm at 24 degrees C. Larger concentrations of 1 ppm resulted in 100% death rate, while 0.1 ppm did not prove lethal. All parts of the plant contain the active ingredient. Concentrations lower than 1 ppm are not lethal for flora or fauna.