(n.) The wood of several tropical American trees of the order Simarubeae, as Quassia amara, Picraena excelsa, and Simaruba amara. It is intensely bitter, and is used in medicine and sometimes as a substitute for hops in making beer.
Example Sentences:
(1) This study confirms earlier reports on the effectiveness of quassia tincture, which seems to be a useful alternative to clophenothane.
(2) As a result, we conclude that: a) The prophylactic and therapeutic action of the Quassia Amarga in the human pediculosis is confirmed.
(3) 454 patients were treated with quassia tincture for head lice.
(4) Crushed aqueous extracts of leaf, wood, bark and flowers of Quassia amara showed antilarval activity against C quinquefasciatus.
(5) Quassin, a mosquito larvicide isolated from Quassia amara, inhibits tyrosinase activity in the larvae of Culex quinquefasciatus.
(6) The object of this work was to find out the prophylactic action of the Quassia Amarga in the pediculosis of the human scalp.
Quassin
Definition:
(n.) The bitter principle of quassia, extracted as a white crystalline substance; -- formerly called quassite.
Example Sentences:
(1) Since tyrosinase is directly involved in sclerotisation of the cuticle, it is suggested that quassin, as a larvicide, inhibits development of the cuticle.
(2) Quassin lost its antilarval activity on treatment with strong alkalies.
(3) Quassin was present to the extent of 0.1 to 0.14 per cent (average 0.12%) on a dry weight basis in wood of Q. amara.
(4) Quassin was over five times as active as carbaryl, a synthetic antilarval agent.
(5) In presence of quassin phenylalanine, tyrosine and L-dopa levels were increased in larvae.
(6) Quassin has been identified to be the antilarval principle present in this plant and was effective against mosquito larvae at a concentration of 6 ppm.
(7) Monoamine oxidase (MAO), an enzyme directly involved in the metabolism of catecholamines, remained unaffected by quassin, in fact the level of adrenaline also remained unchanged in larvae during quassin poisoning.
(8) Quassin, a mosquito larvicide isolated from Quassia amara, inhibits tyrosinase activity in the larvae of Culex quinquefasciatus.