Abstract: Disclosed are compositions and methods useful for the rapid and facile simultaneous detection of malodorous bacterial metabolites in samples of expired breath and other fluids. The invention enables estimation, by simple visual inspection and comparison against standards, of the concentration of polyamines and volatile sulfur compounds in the micromolar to millimolar range.

Abstract: This invention is a model racetrack that simulates in an authentic manner motor vehicle races including causing the models to crisscross on the straightaway to simulate realistic race conditions. The third and fourth turns have a plurality of lanes which causes some cars to accelerate more than other so that the inside lane tends to go to the outside on the straightaway and the outside lane tends to go to the inside of the straightaway. Also speed controls are provided on a lift conveyor so that the race can be slowed down during "caution flags" and sped back up to race conditions during "green flag" conditions. The models used are authentic reproductions of racing motor vehicles. Different portions of the present invention have different declines for better race simulation of the free wheeling models.