Stimulation of the Olfactory Epithelium with Odorants in Gaseous and Aqueous Phases

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Abstract
The olfactory epithelia of the bullfrog [Rana catesbeiana] and carp [Cyprinus carpio] were stimulated with various ordorants in the gaseous and/or aqueous phases. Some ionic solutions were also applied. By recording the induced waves in the olfactory bulb, the bullfrog responds to odorants in the 2 phases, but the carp can respond only to odorants in the aqueous phase. Comparison of the stimulative effects of the same odorants in the 2 phases was made in the bullfrog. Although various response patterns to gaseous and aqueous stimuli of single cells in the olfactory bulb were found in most cases, a difference in the application methods of vapors and solutions made such comparison difficult. The same single cells in the olfactory bulb usually responded to various odorous vapors and solutions and to ions in different patterns. When the responses to the vapors and solutions of the same odorants of different concentrations were compared, different patterns were also found.

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