the same as those of any pha synthesizing microorganisms yn2 h45 p91 and p161 strains as shown also in this example the detection method for the pha synthesizing microorganisms of the present invention was verified to be detectable for the pha synthesizing microorganisms in the high degree of reliability even using an extremely small quantity of a sample probes of the present invention were verified to show specificity applicable for detection of the pha synthesizing microorganisms as the one example by the dot plot method utilizing probes of the present invention the example for detecting presence of the objective pha synthesizing enzyme genes contained in dnas of the pha synthesizing microorganism genes will be shown as follows similarly in example 4 dnas were prepared from 6 bacteria in total being the known 2 strains e coli jm109 and j1 ferm bp 5352 not having the pha synthesizing ability and 4 strains p cichorii yn2 ferm bp 7375 p cichorii h45 ferm bp 7374 p putida p91 ferm bp 7373 and p jessenii p161 ferm bp 7376 having the pha synthesizing ability after alkaline denaturation of each dna sample 1 u03bcg each was blotted on nylon membrane tropilon 45 tropix inc using a dot blot apparatus brl after drying at 80 u00b0 c for 2 hr the nylon membrane was placed in a vinyl bag and 3 ml of prehybridization solution 6 u00d7 ssc 5 u00d7 denhalt solution 0 5 sds 100 u03bcg ml denatured salmon sperm dna was added to perform prehybridization at 60 u00b0 c for 1 hr prepared in example 3.