Pharmacologic Therapy. The type of drug treatment used depends on the type and stage of African trypanosomiasis (sleeping sickness). Management recommendations were published in The Medical Letter on Drugs and Therapeutics in March 2000 (see the Table below). Table.
Casing is the major structural component of a well. The cost of casing is a major part of the overall well cost, so selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration.
The most common materials for well casing are carbon steel, plastic (most commonly, but not exclusively, PVC), and stainless steel. Different geologic formations dictate what type of casing can be used. For example, parts of the country where hard rock lies underground are known strictly as âsteel states.â.