Morphological and phenotypical characterization of Bacillus sporothermodurans.

Abstract:

AIMS:Enumeration of resistant bacteria in ultra-high temperature (UHT) treated milk; morphological characterization and phenotyping of resistant strains by traditional and nontraditional methods and their identification by molecular biology. METHODS AND RESULTS:Modified standard plate count agar (PCA) and modified brain-heart infusion (BHI) agar were used for colony counts. Physiological culture traits were determined as suggested by Bergey's Manual of Systematic Bacteriology or in modified J-broth or in modified BHI agar. Scanning electron microscope (SEM) was used for microscopic examination. Strain identification was carried out by polymerase chain reaction (PCR). A total of 125 (62.81% of 199) samples were positive and the bacterial load was higher than 10(5) CFU ml(-1) in 46 samples (28.80% of 125). The 16S rRNA sequence of bacterial cultures obtained from UHT-treated milk was similar to that of Bacillus sporothermodurans M215 type strain((T)) and different biotypes were found by analysis of colony appearance, cell morphology and physiological traits. CONCLUSIONS:Bacillus sporothermodurans was the predominant sporigenous micro-organisms in UHT milk. SIGNIFICANCE AND IMPACT OF THE STUDY:BHI agar is more suitable than PCA for quality control of milk after UHT treatment. Modified J-broth medium is useful to determine selected physiological traits of B. sporothermodurans. The strains characterized and identified as B. sporothermodurans were significantly different compared with the type strain.

journal_name

J Appl Microbiol

authors

Montanari G,Borsari A,Chiavari C,Ferri G,Zambonelli C,Grazia L

doi

10.1111/j.1365-2672.2004.02371.x

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

802-9

issue

4

eissn

1364-5072

issn

1365-2672

pii

JAM2371

journal_volume

97

pub_type

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