 isol morpholog bacteriophag specif bacillu acetobact speci best natur habitat bacteriophag semi-solid medium activ divid host bacteria condit provid bacillu acetobact speci rot grass appl bacillu phage includ larg head contractil tail so-call killer particl 350 head long contractil tail particl properti kill multipli sensit cell morpholog type virul bacillu phage isol head oblong tail consist short needl plate acetobact phage resembl coliphag t3 interest promin head capsomer three-prong tail 