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John Tudor, Ph.D.

Professor Emeritus
Office: Science Center 223
Research Lab: Science Center 106
Phone: 610-660-1821
Fax: 610-660-1832


B.S. (1967), M.S.(1970), and Ph.D. (1977) in Microbiology, University of Kentucky

Professional Experience

Instructor, Department of Biology, Winthrop College, Rock Hill, SC

Assistant Professor (1977-84), Associate Professor (1984 - 89), Professor (1989- present), and Chair (1994-2002), Department of Biology, Saint Joseph's University, Philadelphia

Visiting Professor (1988-89), Department of Microbiology and Immunology, Temple University College of Medicine, Philadelphia

Courses Taught

  • Biology I: Cells
  • Biology II: Genetics
  • Microbiology
  • Unseen Life on Earth (non-majors course)


(* undergraduate coauthor) Tudor, J., *J. Davis, *M. Panichella, and *A. Zwolak. 2008. Isolation of predation-deficient mutants of Bdellovibrio bacteriovorus using transposon mutagenesis. Appl. Env. Microbiol. 74:5436-5443.

Tudor, J. and M. McCann. 2007. Genomic analysis and molecular biology of predatory prokaryotes. pp 153-189. In E. Jurkevitch (Editor). Predatory Prokaryotes – Biology, Ecology and Evolution. Springer-Verlag. Heidelberg, Germany.

*Davis, J., *M. Panichella, *A. Zwolak, and J. J. Tudor. 2004.  Isolation of predation-deficient mutants of Bdellovibrio.  Abst. Ann. Meeting Amer. Soc. Microbiol., New Orleans, LA. p.

*Davis, J., *M. Panichella. 2004.  Isolation of predation mutants of Bdellovibrio  bacteriovorus using transposon mutagenesis.  Proc. NCUR. 2004:210.

*Zwolak, A. and J. Tudor. 2004.  Generation of a physical map of the prey-independent  Bdellovibrio bacteriovorus 109JA.  Proc. NCUR. 2004:202.

Williams, Henry N., Marcie L. Baer., and John J. Tudor. 2004. Bdellovibrio. In Brenner, Krieg, Staley and Garrity (Editors), The Proteobacteria, Bergey's Manual of  Systematic Bacteriology, 2nd Edition, Volume 2, Springer-Verlag, New York, NY.

*Gaweska, H., *A. Zwolak, J. Tudor. 2003.  Sizing and Macrorestriction Mapping of the   Bdellovibrio bacteriovorus 109D Genome.  Proc. NCUR 2003.

*Jennings, D., P. Volpe, and J. J. Tudor. 1998.  Characterization and Complementation of Temperature-Sensitive Mutants of Bdellovibrio bacteriovorus 109J.  Abst. Ann. Meeting Amer. Soc. Microbiol., Atlanta, GA., p.321.

*Jennings, D., and J. Tudor. 1998. Construction of a Bdellovibrio bacteriovorus genomic library and successful conjugation between E. coli and prey- dependent bdellovibrios. Proc.NCUR 98: 1207-1211.

*Verosko, J., *M. Potts, and J. Tudor. 1998. Identification and characterization of temperature-sensitive Bdellovibrio bacteriovorus mutants via attachment kinetics assays. Proc.NCUR 98: 1259-1262.

*Scognamiglio, T. and J. J. Tudor. 1997. Macrorestriction Patterns and Genome Sizes of Two Strains of Bdellovibrio.  Proc. Natl.Conf. Undergrad. Res.11: 1384-1388.

*Nguyen, B. and J. J. Tudor. 1997. Differentiation and Classification of Bdellovibrio bacteriovorus using Random Amplified Polymorphic DNA (RAPD) Analysis.  Proc. Natl.Conf. Undergrad. Res. 11 :1509-1512.

*Nguyen, B., *T. Scognamiglio, and J. J. Tudor.1997. RAPD and Macrorestriction Polymorphism Analysis of Bdellovibrio Strains.Abst. Ann. Meeting Amer.    Soc. Microbiol., Miami Beach, FL, p. 529

*Nguyen, B. and J. J. Tudor. 1996. Differentiation of Bdellovibrio strains using a random-amplified polymorphic DNA assay. Abst. Ann. Meeting Amer. Soc. Microbiol., New Orleans, LA, p. 312.

*Scognamiglio, T. and J. J. Tudor. 1996. Macrorestriction patterns and partial genomic map of Bdellovibrio. Abst. Ann. Meeting Amer. Soc. Microbiol., New Orleans, LA, p. 492.

*Catanzaro, R. and J. J. Tudor. 1996. Isolation and characterization of temperature-sensitive mutants of Bdellovibrio bacteriovorus 109J. Abst. Ann. Meeting Amer. Soc. Microbiol., New Orleans, LA, p. 312.


The study of the developmental cycle of the bacterium, Bdellovibrio bacteriovorus. The bdellovibrios are obligate preditors of other Gram-negative bacteria, exhibiting a bi-phasic life cycle characterized by a free living attack phase and an intraperiplasmic growth phase.

Ongoing projects include:

  • Isolation of mutants unable to grow predatiously by utilizing transposon insertion mutagenesis.
  • Characterization of predation-deficient mutants.
  • Isolation and cloning of predation-specific genes.
  • DNA sequence analysis of predation-specific genes.