Abstract: Polyesters having a reduced gel content may be made from dicyclopentadiene having a purity of less than about 90% by incorporating from 30 to 200 ppm of an aromatic inhibitor into the dicyclopentadiene prior to reacting the glycol and carboxylic acid to form the polyester.

Abstract: A process and apparatus are provided for detection of viable and potentially hazardous biological particles which may be dispersed in a particulate-containing airstream. The process comprises directing each of the contained particles along a linear path through air, in a sequential manner, and sampling them for determination of their size, whether they are biological and viable, and whether they are present in concentrations greater than background levels. The particle size identifies the particles as respirable or not and the particles are characterized as biological and viable by subjecting each particle in turn, to 340 nm, ultraviolet laser light and looking for the emission of fluorescence which is typically emitted from bacteria or bacterial spore. Fluorescence detected in the 400-540 nm range signals the presence of nicotinamide adenine dinucleotide hydrogen, which is indicative of biological activity or viability.

Abstract: A toaster having a mechanically actuated cover for each of one or more toasting volumes. Each cover at least partially covers a toasting volume within the toaster during toasting, thereby reducing heat transfer (primarily due to convection) away from the toaster and the object being toasted. In preferred embodiments, each cover is a pair of slidably mounted plates. When a carriage (supporting an object to be toasted) is manually lowered by a user, a mechanical linkage attached to the carriage cause the plates to slide together to cover (substantially or totally) a toasting volume. When the carriage springs up (at the end of the toasting operation), the mechanical linkage slides the plates away from each other to allow removal of the toasted object from the toaster. In other preferred embodiments, each cover is a pair of rotatably mounted plates.