Greetings Vortex-l, There is a highly interesting research paper by Rullan on UFO and Odors that relates to odors bieng a possible source of propulsive effects:
http://www.scribd.com/doc/14029800/rullan I remember in the early 1950 s there was an incident of a downed UFO and its occupant being outside the craft and a very heavy level of ammonia. I am not sure if there is a chemistry for breathing ammonia, but Cyano groups are CN. Also, ammonia is very easy to liquify ...pressure circa 100 PSI. A liquid ammonia ocean could possible support life.... a needed oxidizer would be ???.... or a halogen reaction.. ..this woulld change our concept of food. Ron Kita Chiralex
