Enumeration of bacteriophage particles

Electron micrographic counts of bacteriophage particles.

Bacteriophage particles with endo-glycosidase activity.

Some Escherichia coli K bacteriophage particles, capable of interacting specifically with bacterial polysaccharide capsules, carry an endo-glycosidase activity, probably located in the spikes.

Endo-N-acetylneuraminidase associated with bacteriophage particles.

A bacteriophage (phi 1.2) has been isolated for Escherichia coli K235 (O1:K1:H-). phi 1.2 is specific for the host capsular polysaccharide (colominic acid). The phage forms plaques with acapsular halos and thus carries a glycanase activity for colominic acid, a homopolymer of alpha (2 leads to 8)-linked N-acetylneuraminic acid (NeuNAc) residues. Upon incubation with purified phi 1.2 particles, ...

Genetic Recombinations Leading to Production of Active Bacteriophage from Ultraviolet Inactivated Bacteriophage Particles.

HE T potentialities of bacteriophage genetics have been revealed by the discovery of genetic recombinations among related phage particles infecting the same bacterial cell (DELBR~CK and BAILEY 1946). The complexities of these genetic systems have been further illustrated by the work of HERSHEY and ROTMAN (1948) on a number of different genetic determinants involved in the determination of the a...

Presence of bacteriophage-like inhibitory particles in Escherichia coli.

Bacteriophage-like particles were found in the supernatant fluids of Escherichia coli O111a and O111:B(4). Caution is urged in the study of deoxyribonucleic acid synthesis and replication in these strains.