Disc gel electrophoresis of the vegatative cell -free extracts ofstrains of Clostridium botulinum types A, B, C, E, and F and therelated nontoxic group showed limited value as a means for identifyingthese closely related microorganisms, since separation,though not consistent in all cases, could only be based on the numberof protein...
Bdellovibrio bacteriovorus is a small parasitic bacterium present
in soil, mud, and aquatic habitats. Due to its lysis of Gramnegative
bacteria, an important role in soil ecology has been suggested
for this organism. A study of effects of herbicides upon
Bdellovibrio might consequently be of considerable value.
In this study...
Using thermal denaturation methodology, the nucleic acid
base composition of deoxyribonucleic acid (DNA) isolated from type,
neotype and stock strains of Lactobacillus species was determined.
The genus was found to be heterogeneous in base composition,
ranging from 33.1 to 50.0 moles % guanine plus cytosine (GC).
Genus members fell into...
This project was initiated to find a practical way of
identifying the volatiles and monitoring their relative concentrations.
Special attention was given to the identification
of the organic acids.
Volatile compounds produced in a swine confinement
building were trapped by porous polymers, Porapak Ω and Tenax
GC, and identified by...
An additional layer, exterior to the outer membrane cellwall
layer, was found on Aeromonas salmonicida cells from aggregating
strains. Nonaggregating strains were found to lack this layer.
The nonaggregating strains were all avirulent (LD₅₀
greater than
1 X 10
⁸ CFU/fish) while the majority of the aggregating strains
were virulent...