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This paper discusses entropy production in nonequilibrium steady states for infinite quantum spin systems. Rigorous results have been obtained recently in this area, but a physical discussion shows that some questions of principle remain to be clarified.
We have recorded 54 species of non-native or alien freshwater fishes from 14 of the 15 reservoirs in Singapore. 31 of these species are established and breeding in the reservoirs. Three species (Mystus wolffii, Amphilophus citrinellum, and Satanoperca jurupari) represent new alien records for Singapore.