Simhony M, Athenstaedt H
Biophys J. 1980 Feb;29(2):331-7. doi: 10.1016/S0006-3495(80)85136-8.
Pyroelectric (PE) voltage responses to single square radiation signals absorbed in epidermal layers of the leaves of Encephalartos villosus and Rhododendron catawbiense and in the integument of the insect Periplaneta americana L. were investigated on dry preparations as well as on whole fresh leaves and live insects. Measurements of the initial slopes of the responses, the rise times, and the peak voltages were carried out with 10 interchangeable load resistors from 5M omega to 10 G omega, connected parallel to the samples. In encephalartos leaves this yielded for the permittivity epsilon and the PE coefficient lambda in the upper/lower epidermis, epsilon = 30/60 and lambda = 2/6 pC/cm2K, respectively, and in rhododendron, epsilon = 60/200 and lambda = 3/15 pC/cm2K. In periplaneta we found epsilon = 300 and lambda = 20 pC/cm2K for the abdomen rings, and epsilon = 1,000 and lambda = 350 pC/cm2K for the thorax of live insects. Generally, dry preparations of leaves, and especially of insects, showed smaller PE responses. The outer epidermis of live plant leaves and the integument of live insects appear to be polar and to exhibit pronounced PE properties.
研究了绒毛铁树（Encephalartos villosus）和卡托巴杜鹃（Rhododendron catawbiense）叶片表皮层以及美洲大蠊（Periplaneta americana L.）昆虫体表对单个方形辐射信号的热释电（PE）电压响应，研究对象包括干燥标本、新鲜完整叶片和活体昆虫。使用10个阻值从5MΩ到10GΩ的可互换负载电阻与样品并联，测量响应的初始斜率、上升时间和峰值电压。对于绒毛铁树叶片，上/下表皮的介电常数ε和热释电系数λ分别为ε = 30/60和λ = 2/6 pC/cm²K；对于杜鹃花，ε = 60/200和λ = 3/15 pC/cm²K。对于美洲大蠊，活体昆虫腹部环节的ε = 300和λ = 20 pC/cm²K，胸部的ε = 1000和λ = 350 pC/cm²K。一般来说，叶片的干燥标本，尤其是昆虫的干燥标本，热释电响应较小。活体植物叶片的外表皮和活体昆虫的体表似乎具有极性，并表现出明显的热释电特性。
