In material collected from birds (Aves, Procellariiformes) in the South Georgia region by Polish Antarctic Marine Research Expedition in 1976 the following mallophagan species were found: Docophoroides brevis (Duf.), Naubates fuliginosus (Tasch.), Pseudonirmus gurlti (Tasch.) and Trabeculus hexacon (Wat.). These are the first records from this region.
The course of design of an optocoupler's PSpice macromodel including noise sources is described. The PSpice macromodel is proposed for the low frequency range. The PSpice model of a MOSFET transistor was applied as the noise source type 1/fα in an optocoupler PSpice macromodel. In the enhanced macromodel the value of an exponent α can be changed in the range of 0.8-1.25.