Rotor and Nacelle Mass. Rotor mass trends are always complicated by quite different material solutions, choice of aerofoils and design tip speed, all of which can impact very directly on the solidity (effectively surface area) and mass of a blade. Table 3.3 shows blade mass of very large wind turbines. The introduction into Enerconâs E126 design of a jointed blade with a steel spar on the inner blade is a clear example of where blade technology is radically different from most other large blades. Table 3.3: Blade Mass of Very Large Wind Turbines.
Chemicals used in insecticides (chlorophe-. nothane), glue (toluene), and Stoddard solvent. (petroleum distillates) have also been associated with. aplastic anemia. Drugs. Chloramphenicol was, at one point, the most. common cause of drug-induced aplastic anemia in the. United States. Anticonvulsant medications, in particular. carbamazepine and hydantoins, are also associated with. the development of aplastic anemia.
Aplastic anemia is a rare disease in which the bone marrow and the hematopoietic stem cells that reside there are damaged. This causes a deficiency of all three blood cell types (pancytopenia): red blood cells (anemia), white blood cells (leukopenia), and platelets (thrombocytopenia). Aplastic refers to inability of the stem cells to generate mature blood cells. It is most prevalent in people in their teens and twenties, but is also common among the elderly. It can be caused by exposure to chemicals, drugs, radiation, immune disease, and heredity. However, in about half the cases, the cause is unknown. The definitive diagnosis is by bone marrow biopsy; normal bone marrow has 30â70% blood stem cells, but in aplastic anemia, these cells are mostly gone and replaced by fat.