The behaviour of some amino acids in gamma irradiated soils

Voets, J. P.; Dedeken, M.; Bessems, E.P.M.

doi:10.1007/bf00626239

Cited by 14 publications

(2 citation statements)

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“…Thus it is clear that loss of viability does not necessarily imply susceptibility to autolysis or attack by soil enzymes. Voets and Dedeken (19) have reported that proteolytic activity remained in gamma-sterilized soils whereas degradation of amino acids did not occur under the same conditions (20). In the present experiments it is possible that Can.…”

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confidence: 50%

Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus

Knowles¹,

Chu²

1969

Can. J. Microbiol.

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15Nitrogen-enriched Serratia cells and (NH4)2SO4 were added separately to non-sterile, to gamma-irradiated, and to autoclaved black spruce raw humus F horizon (pH 3.4). Survival of the Serratia and the distribution of added- and of soil-N between several inorganic- and organic-N fractions were studied from 0 to 100 days.The zero time distribution of cell-N was similar to that of the soil-N, indicating that soil microorganisms probably contribute N to most of the N fractions considered. Irradiation at 1.5 Mr induced no important change in soil N fractionation, but autoclave sterilization released a small amount of exchangeable NH4+-N. In non-sterile soil, added NH4+-N was immobilized in and added cell-N was mineralized from the organic N fractions (hydrolyzable forms of N, acid-insoluble humin-N, etc.). Addition of either NH4+- or cell-N caused "N interchange" and the mineralization of soil N. In irradiated soil, transformations were much decreased and were not directly related to population size. In autoclaved soil at pH 3.4 change in cell-N and fixation of NH4+-N were negligible. There was no relation between the multiplication or disappearance of an added Serratia population (under different conditions of partial sterility and pH) and the rate of mineralization of the added cell-N.

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Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus

Knowles¹,

Chu²

1969

Can. J. Microbiol.

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“…For example, it is known that soil phosphatase, saccharase, and urease are much more resistant to radiation, being unaffected by 2 Mrad. Voets, Dedeken & Bessems (1965) and Skujins, Braal & McLaren (1962) found that 19 Mrad was required to reduce the initial activity of phosphatase to 37%. Bacq & Alexander (1961) point out that inactivation of enzymes in dilute aqueous solution can show considerable variation.…”

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confidence: 98%

Rapid changes in nitrite after gamma irradiation of fresh soils

Cawse

White

1969

J. Agric. Sci.

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Increases in nitrite in ten gamma-irradiated soils have been investigated under aerobic conditions up to 7 days after treatment over the range 0-25-2-5 Mrad. The formation of nitrite showed significant correlations with the percentage of soil inorganic carbon and incubation time, and over 100 ppm nitrite-N accumulated within 3 days in Broadmoor series, which contained the most inorganic carbon. Only the very acid series failed to produce nitrite, but formation and persistence was poor in all soils below pH 7.Leaching with ammonium or nitrate ions after irradiation suggested that microbial reduction of nitrate was the mechanism responsible for nitrite accumulation, rather than inhibition of nitrite oxidation.

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Applicability of arginine ammonification as indicator of microbial activity in different soils

Alef

Kleiner

1987

Biol Fert Soils

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The behaviour of some amino acids in gamma irradiated soils

Cited by 14 publications

References 6 publications

Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus

Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus

Rapid changes in nitrite after gamma irradiation of fresh soils

Applicability of arginine ammonification as indicator of microbial activity in different soils

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The behaviour of some amino acids in gamma irradiated soils

Cited by 14 publications

References 6 publications

Survival and mineralization and immobilization of 15N-labelled Serratia cells in a boreal forest raw humus

Survival and mineralization and immobilization of 15N-labelled Serratia cells in a boreal forest raw humus

Rapid changes in nitrite after gamma irradiation of fresh soils

Applicability of arginine ammonification as indicator of microbial activity in different soils

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Product

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Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus

Survival and mineralization and immobilization of ¹⁵N-labelled Serratia cells in a boreal forest raw humus