전주천의 3지점을 선정하여 caulobacters의 분포를 조사하였다. 자연수에 존재하는 caulobacters의 계수방법으로 MPN방법을 시험하여 유용한 결과를 얻었다. MPN방법으로 측정한 caulobacters의 수효는 1번 지점에서 7.9×10 exp (2) MPN/㎖, 2번 지점에서 1.1×10 exp (3) MPN/㎖, 3번 지정에서 1.1×10 exp (4) MPN/㎖ 이었으며 전체 chemoheterotrophic bacteria 중에서 caulobacters가 차지하는 비율은 시험장소의 total heterotroph count에 역비례하는 것으로 나타났다. 분리된 caulobacter의 수효는 모두 66주이었다. 이들 중 bacteroid형이 50%, vibroid형이 21%, subvibroid형이 14%, fusiformis형이 15%이었다. fusiformis형의 분리빈도는 전주공단의 폐수가 유입되는 3번 지점에서 다른 지점들보다 훨씬 높게 나타났다. 또한 caulobacters를 분리하는 첫 단계인 enrichment culture에서 3번 지점의 경우 때때로 비정상적으로 긴 사상체의 caulobacter 세포들이 관찰되었다.

The distribution of caulobacters in Chonjucheon was investigated. Samples were taken from the surface waters of three sites of Chonjucheon. The three sampling sites were found to have different levels of water pollution. For the enumeration of caulobacters in natural waters, MPN method was tested and found to be useful. The caulobacter counts by MPN method were 7.9×10 exp (2) MPN/㎖ at site 1, 1.1×10 exp (3) MPN/㎖ at site 2, 1.1×10 exp (4) MPN/㎖ at site 3 and the proportion of caulobacters among chemoheterotrophic bacteria was found to be inversely related to the total heterotroph counts. 66 isolates of caulobacters were obtained from the three sites. 50% of the total isolates was bacteroid type; 21% was vibroid type; 14% was subvibroid type; 15% was fusiformis type. The isolation frequency of fusiformis type was much higher at site 3, where wastewater of Chonju Industry Complex enters, than the other sites. And in enrichment cultures for the isolation of caulobacters from site 3 were occasionally found abnormally long filamentous cells of caulobacter.