The identities and biochemical properties of extracellular enzymes present in natural environments are poorly constrained. We used a series of competitive inhibition experiments with samples from a freshwater environment (the Tennessee River at …
The ratios of D- versus L-amino acids can be used to infer the sources and composition of sedimentary organic matter. Such inferences, however, rely on knowing the rates at which amino acids in sedimentary organic matter racemize abiotically between …
Measurements of the spectrum of extracellular enzymes present in an environment can indicate the nature of organic substrates available to microorganisms. We report the activities in an Arctic fjord (Smeerenburgfjord, Svalbard) of the extracellular …
Heterotrophic microbial communities contain substantial functional diversity, so studies of community function often generate multivariate data sets. Techniques for data reduction and analysis can help elu- cidate qualitative differences among sites …
Extracellular enzymatic hydrolysis of high-molecular weight organic matter is the initial step in sedimentary organic car- bon degradation and is often regarded as the rate-limiting step. Temperature effects on enzyme activities may therefore exert …