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  • Author or Editor: G. Horanic x
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Abstract

Liquid crystals are a part of a large number of organic compounds which, upon heating, change from a viscous liquid to a clear isotropic liquid. Many liquid crystals are derivatives of cholesterol. In the transition stage between solid and isotropic liquid, liquid crystals possess light scattering properties which result in changes of color in response to changes in temperature (1).

Open Access

Abstract

Studies show electrical potential (Millivoltage output) generated by citrus seedlings is useful as an indication of freezing in hardened seedlings or where freeze rates are 1° hr-1 or less. Needle-sharp probes of a gold-amalgam wire attached to a strip chart recorder with a variable millivolt supply were used to detect mv changes in seedlings exposed to freeze conditions in an artificial environment room. An abrupt increase of 2 to 6 mv in the mv signal indicated the onset of freezing in the seedlings as checked by the heat of crystallization measured with thermocouples, visual signs of freezing, and subsequent physical damage studies.

Open Access