ABSTRACT

Lactobacillus acidophilus — A bacterium found in milk and dairy products and in the feces of adults and bottlefed babies.

lactose — A milk sugar composed of glucose and galactose. lacustrine — Referring to lake or river habitats. LADD — Acronym for lifetime daily average dose; low-

est acceptable daily dose. lading — See bill of lading. LAER — Acronym for lowest achievable emission rate. lag — A delay in the effect of a changed condition at one

point in a system or some other condition to which it is related.