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Kinetic studies on the mechanism of photoreactivation of bacteriophage T2 inactivated by ultraviolet light


Bowen, George Hamilton (1953) Kinetic studies on the mechanism of photoreactivation of bacteriophage T2 inactivated by ultraviolet light. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/NCJW-ZP95.


Bacteriophage particles are called active if they are capable of generating a plaque when plated on agar by a standard technique. Exposure of the particles to ultraviolet radiation of wave length 253.7 m[mu] inactivates them in this sense. Following adsorption of the inactive particles to sensitive host bacteria, exposure of the suspension to light of the violet and near ultraviolet region causes a fraction of the particles to regain their activity, a phenomenon called photoreactivation.

The kinetics of photoreactivation of bacteriophage T2 have been investigated for the purpose of studying the mechanism by which photoreactivation takes place. The presence of a dark reaction in addition to the light reaction has been demonstrated. The dark reaction precedes the other and has the function of supplying the light-absorbing material which enters into the light reaction. Both the light and the dark reactions follow first-order kinetics.

The amount of photoreactivation produced by a given light treatment is determined by the interaction of the light and dark reactions. This interaction can be described satisfactorily in terms of a simple model for the reaction mechanism.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Major Option:Biology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Delbruck, Max
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1953
Record Number:CaltechETD:etd-04212003-134051
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1434
Deposited By: Imported from ETD-db
Deposited On:21 Apr 2003
Last Modified:20 Dec 2019 19:36

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