You need JavaScript to view this

Sterilization of peat by gamma radiation

Journal Article:

Abstract

The effect of gamma-radiation on the survival of microorganisms has been quantified for the natural population of two types of peat. Data for several microbial types have been separately determined by regular plating and by indirect statistical probability estimates including, a wholly enclosed 'inverted-bottle' technique for higher dose levels to exclude any possibility of post-treatment contamination. The most persistent microorganisms at intermediate dosage (2.5-3.5 Mrad) were commonly a micrococcus (which closely resembled Micrococcus radiodurans) arthrobacter-like rods, myxobacteria and amoeboid forms. The persistent organisms all survived because of high resistance to ..gamma..-irradiation, not because of high initial numbers. The most numerous true bacteria (including spore-formers), actinomycetes, filamentous fungi and yeasts were all readily destroyed. Although the safety margin with the commercially recommended dose of 5 Mrad is low for some of the more resistant organisms, no change is justified at this stage since the organisms most likely to survive such a dose do not seem to seriously affect the subsequent growth and survival of rhizobia. Moreover there would be some risk of radiation-induced peat toxicity if higher doses were applied and some post-irradiation contamination will be difficult to avoid in commercial production.
Authors:
Parker, F E; Vincent, J M [1] 
  1. New South Wales Univ., Kensington (Australia). School of Microbiology
Publication Date:
Jan 01, 1981
Product Type:
Journal Article
Reference Number:
AIX-13-674963; EDB-82-105332
Resource Relation:
Journal Name: Plant Soil; (Netherlands); Journal Volume: 61:1/2
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; PEAT; MICROORGANISMS; RADIOSTERILIZATION; BACTERIA; BACTERIAL SPORES; EXTERNAL IRRADIATION; FUNGI; GAMMA RADIATION; GAMMA SOURCES; MICROCOCCUS RADIODURANS; QUANTITY RATIO; RADIOSENSITIVITY; SURVIVAL CURVES; YEASTS; ELECTROMAGNETIC RADIATION; ENERGY SOURCES; FOSSIL FUELS; FUELS; IONIZING RADIATIONS; IRRADIATION; MICROCOCCUS; ORGANIC MATTER; PLANTS; RADIATION SOURCES; RADIATIONS; SPORES; STERILIZATION; 560131* - Radiation Effects on Microorganisms- Basic Studies- (-1987)
OSTI ID:
5475424
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: PLSOA
Submitting Site:
HEDB
Size:
Pages: 285-293
Announcement Date:

Journal Article:

Citation Formats

Parker, F E, and Vincent, J M. Sterilization of peat by gamma radiation. Netherlands: N. p., 1981. Web.
Parker, F E, & Vincent, J M. Sterilization of peat by gamma radiation. Netherlands.
Parker, F E, and Vincent, J M. 1981. "Sterilization of peat by gamma radiation." Netherlands.
@misc{etde_5475424,
title = {Sterilization of peat by gamma radiation}
author = {Parker, F E, and Vincent, J M}
abstractNote = {The effect of gamma-radiation on the survival of microorganisms has been quantified for the natural population of two types of peat. Data for several microbial types have been separately determined by regular plating and by indirect statistical probability estimates including, a wholly enclosed 'inverted-bottle' technique for higher dose levels to exclude any possibility of post-treatment contamination. The most persistent microorganisms at intermediate dosage (2.5-3.5 Mrad) were commonly a micrococcus (which closely resembled Micrococcus radiodurans) arthrobacter-like rods, myxobacteria and amoeboid forms. The persistent organisms all survived because of high resistance to ..gamma..-irradiation, not because of high initial numbers. The most numerous true bacteria (including spore-formers), actinomycetes, filamentous fungi and yeasts were all readily destroyed. Although the safety margin with the commercially recommended dose of 5 Mrad is low for some of the more resistant organisms, no change is justified at this stage since the organisms most likely to survive such a dose do not seem to seriously affect the subsequent growth and survival of rhizobia. Moreover there would be some risk of radiation-induced peat toxicity if higher doses were applied and some post-irradiation contamination will be difficult to avoid in commercial production.}
journal = {Plant Soil; (Netherlands)}
volume = {61:1/2}
journal type = {AC}
place = {Netherlands}
year = {1981}
month = {Jan}
}