The Morphological description and histological structure of olfactory organ in barn owl have been studied.The results of morphological description showed that the olfactory organ in the animal under study have pair of external nares ovale shape which lead to pair of nasal chambers which are located at the dorsal surface of head under eyes level.The
In the social stratification created by the Dutch colonial government, Chinese community in the Netherlands Indies occupied the second place, after Board Europeans.They live scattered in various cities, one of them is Surabaya.In this city they also settled in the second place after the indigenes in terms of numbers.Tan Tjwan Bie, one of them, was
We present a simple mathematical model of the infestation of a honeybee colony by the Acute Paralysis Virus, which is carried by parasitic varroa mites (Varroa destructor).This is a system of nonlinear ordinary differential equations for the dependent variables: number of mites that carry the Tape virus, number of healthy bees and number of sick be