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analytical threshold and stability results on age-structured epidemic models with vaccination.this paper examines mathematical models for common childhood diseases such as measles and rubella and in particular the use of such models to predict whether or not an epidemic pattern of regular recurrent disease incidence will occur. we use age-structured compartmental models which divide the population amongst whom the disease is spreading into classes and use partial differential equations to model the spread of the disease. this paper is particularly concerned with an analytical investigati ...20123266036
polycyclic aromatic compounds (pac) in leaf lettuce.twenty-three samples of leaf lettuce (lactuca sativa var. crispa) cultivated in private gardens in southern finland were analyzed for polycyclic aromatic hydrocarbons (pah) and derivatives. the total pah concentrations varied from 4.8 to 94 micrograms/kg fresh weight. nitro derivatives of pah were detected in only five samples. one lettuce sample was also analyzed for pah oxy-derivatives. 9h-fluoren-9-one (1.3 microgram/kg) and 6 h-benzo[cd]pyren-6-one (0.3 microgram/kg) were found. the profiles ...20133765856
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