A compound of formula : wherein A1, A2, A3, A4, A1\u2032, A2\u2032, A3\u2032, A4\u2032, A5\u2032, A6\u2032, G1, R1, R2, R3, R4, R5a and R5b are as defined in claim 1; or a salt or N-oxide thereof. The spark plug is comprised of a ground electrode having a base end portion fixed to a metal shell, a bend portion integrally formed with the base end portion and being bent and a front end portion integrally formed with the bend portion and forming a spark discharge gap \u201cg\u201d with a center electrode. An ecosystem is created in the shipping containers where fish fertilize plants and plants clarify the water for the fish. The non-linear, passive, current-limiting device could comprise a field-effect transistor, as well as a junction FET a metal-oxide semiconductor FET, or a current-limiting diode connected in series with the APD and the bias source. A measuring chip includes a single dielectric block having all the first to third faces and the film layer integrally formed on the first face of the dielectric block.