Aminoglycosides are excreted by glomerular filtration and have a serum half-life of 2 to 3 h; the half-life increases exponentially as the GFR falls (eg, in renal insufficiency, in the elderly).
Madagascar is the world's major natural vanilla producer, accounting for about 75% of production. Cloves are the third main export crop, grown mostly by smallholders. Production follows a 4-year cycle with 2â3 years of high output followed by one year of low production.
Rice was not a cash crop for the southern colonies but tobacco,  indigo, and corn wheat were. In addition, perhaps the biggest cash  crop grown in the southern colonies was â¦cotton. The South grew to  rely so heavily on cotton and the money it generated that it began  to direct their society, leading to the Southern dependence on  slavery. 11 people found this useful.