ionophone


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ionophone

[ī′än·ə‚fōn]
(engineering acoustics)
A high-frequency loudspeaker in which the audio-frequency signal modulates the radio-frequency supply to an arc maintained in a quartz tube, and the resulting modulated wave acts directly on ionized air to create sound waves.
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Application of the ionophone A23187 leads to higher levels of cytosolic [Ca.sup.2+] in root hairs and a decrease in cytoplasmic streaming (Felle et al., 1992; Sattelmacher et al., 1993), supporting the concept that higher free cytosolic levels of [Ca.sup.2+] are inhibiting to cytoplasmic streaming.
A proportion of uninfected root hairs had fluorescence confined to the tip, i.e., [Ca.sup.2+] concentrated there; this fluorescence was eliminated by prior treatment with the [Ca.sup.2+] ionophone A23187.