taiga soil
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Protistology ◽  
2021 ◽  
Author(s):  
Anna A. Glotova ◽  
◽  
Sergey V. Loiko ◽  
Georgy I. Istigichev ◽  
Anastasia I. Kulemzina ◽  
...  
Keyword(s):  


2018 ◽  
Vol 19 (6) ◽  
pp. 2697-2707 ◽  
Author(s):  
Vera D. Tikhova ◽  
Yuliya M. Deryabina ◽  
Roman S. Vasilevich ◽  
Evgeny D. Lodygin


1998 ◽  
Vol 64 (11) ◽  
pp. 4291-4298 ◽  
Author(s):  
Jay Gulledge ◽  
Joshua P. Schimel

ABSTRACT NH4 + inhibition kinetics for CH4 oxidation were examined at near-atmospheric CH4 concentrations in three upland forest soils. Whether NH4 +-independent salt effects could be neutralized by adding nonammoniacal salts to control samples in lieu of deionized water was also investigated. Because the levels of exchangeable endogenous NH4 + were very low in the three soils, desorption of endogenous NH4 +was not a significant factor in this study. TheKm(app) values for water-treated controls were 9.8, 22, and 57 nM for temperate pine, temperate hardwood, and birch taiga soils, respectively. At CH4 concentrations of ≤15 μl liter−1, oxidation followed first-order kinetics in the fine-textured taiga soil, whereas the coarse-textured temperate soils exhibited Michaelis-Menten kinetics. Compared to water controls, the Km(app) values in the temperate soils increased in the presence of NH4 + salts, whereas the V max(app) values decreased substantially, indicating that there was a mixture of competitive and noncompetitive inhibition mechanisms for whole NH4 + salts. Compared to the corresponding K+ salt controls, the Km(app) values for NH4 + salts increased substantially, whereas the V max(app) values remained virtually unchanged, indicating that NH4 + acted by competitive inhibition. Nonammoniacal salts caused inhibition to increase with increasing CH4 concentrations in all three soils. In the birch taiga soil, this trend occurred with both NH4 + and K+ salts, and the slope of the increase was not affected by the addition of NH4 +. Hence, the increase in inhibition resulted from an NH4 +-independent mechanism. These results show that NH4 +inhibition of atmospheric CH4 oxidation resulted from enzymatic substrate competition and that additional inhibition that was not competitive resulted from a general salt effect that was independent of NH4 +.



ARCTIC ◽  
1978 ◽  
Vol 31 (3) ◽  
Author(s):  
Elena B. Sparrow ◽  
Charlotte V. Davenport ◽  
Ronald C. Gordon
Keyword(s):  


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