A first insulating film 4 having a first opening portion is formed on an emitter region 10 and a second insulating film 6 having a second opening portion smaller than the first opening portion is formed on the first insulating film 4. Bacteria counting apparatuses and reagent kits for counting bacteria are also described. The client request and responses to the request are generated using fuzzy logic selection from a requestresponse object pool. By exactly positioning the frame elements and the spacer elements, for example on a supporting wall, a stable suspension device for an entire screen wall can be formed.