Bacteriophages ( phages ) are obli
Composition of Bacterioph
age
Nucleic acid: either DNA or RNA but n ot both
ds DNA, ss RNA, ss DNA unusual or modified bases
encode 3-5 gene products to over 100 g
ene products
Structure of Bacterioph
age
different sizes and shapes
icosahedra l 二二二二
Types of Bacteriophage
Lytic or Virulent Phages
毒毒毒毒毒
Lysogenic or Temperate Phage
Lytic or Virulent Phages
Definition:
Life Cycle
Adsorption 毒毒 Penetration 毒毒
Biological Synthesis 毒毒毒毒
normal bacteriopha ge
bacteriophage aft er contraction of
Assay for Lytic Phag
e
Lytic phage are enumerated by a pl
Lysogenic or Temperate Phage 毒毒毒毒毒毒毒毒毒毒毒毒
Lysogenic or temperate phages are those that ca
Animation summarizing the lysogenic
When a cell becomes lysogenized,
occasionally extra genes carried by the phage get expressed in the cell . These genes can change the prop erties of the bacterial cell. This pro cess is called lysogenic conversion.
Application of Bacterioph
age
Used in treatment of bacterial infec
tions
Used for the identification of patho
genic bacteria (phage typing 二二二二 二二 )
