Dr. Peter Kourtev - selected abstracts
Hill, K.A., Shepson, P.B., Galbavy, E.S., Anastasio, C., Kourtev, P.S., Konopka, A. and Stirm, B.H. (2007) Processing of atmospheric nitrogen by clouds above a forested environment. J. Geophys. Res.-Atmos., D11301.
Dissolved inorganic ions (NH+4, Ca2+, Mg2+, K+, H+, NO3-, and SO2-4) and organic nitrogen (DON) were measured in cloud water samples collected over the northern lower peninsula of Michigan. Within a given cloud field, several altitudes were sampled to examine changes in concentration and speciation with altitude ... [Read full abstract]
Kourtev, P.S., Konopka, A. and Nakatsu, C.H. (2006). Responses of the anaerobic bacterial community to the addition of organic C in chromium(VI)- and iron(III)-amended microcosms Appl. Environ. Microbiol., 72: 628-637.
Chromium (VI) is toxic to microorganisms and can inhibit the biodegradation of organic pollutants in contaminated soils. We used microcosms amended with either glucose or protein (to drive bacterial community change) and Fe(III) (to stimulate iron-reducing bacteria) to study the effect of various concentrations of Cr(VI) on anaerobic bacterial communities. Microcosms were ...[Read full abstract]
Nakatsu, C.H., Carmosini, N., Baldwin, B., Beasley, F., Kourtev, P. and Konopka, A. (2005). Soil microbial community responses to additions of organic carbon substrates and heavy metals (Pb and Cr). Appl. Environ. Microbiol., 71: 7679-7689.
Microcosm experiments were conducted with soils contaminated with heavy metals (Pb and Cr) and aromatic hydrocarbons to determine the effects of each upon microbial community structure and function. Organic substrates were added as a driving force for change in the microbial community. Glucose represented an energy source used by a broad variety of bacteria ...[Read full abstract]
Kourtev, P.S. and Ehrenfeld, J.G. and Häggblom, M. (2003). Experimental analysis of the effect of exotic and native plant species on the structure and function of soil microbial communities. Soil Biol. & Biochem., 35: 895-905.
Invasions of exotic plant species are among the most pervasive and important threats to natural ecosystems, however, the effects of plant invasions on soil processes and the soil biota have rarely been investigated. We grew two exotic and a native under-story plant species in the same mineral soil from a non-invaded forest ...[Read full abstract]
Kourtev, P.S. and Ehrenfeld, J.G. and Häggblom, M. (2002). Exotic species alter microbial community structure and function in the soil. Ecology, 83: 3152-3166
Exotic plant species are increasingly becoming the focus of research and have been identified as a component of human-induced global change. Successful invaders may alter soil conditions, but the effect of exotic species on soil microbial communities has not-been studied. We studied two exotic understory plant species (Japanese barberry [Berberis thunbergii] and Japanese stilt grass...[Read full abstract]
Kourtev, P.S. and Ehrenfeld, J.G. and Huang, W.Z. (2002). Enzyme activities during litter decomposition of two exotic and two native plant species in hardwood forests of New Jersey. Soil Biol. & Biochem., 34: 1207-1218.
Invasions by exotic plant species can alter ecosystem properties, including important soil functions and characteristics. As a result, decomposition of litter from the exotic, as well as native plants, can also be altered, leading to more profound changes in ecosystem functioning. We present here a study of eight enzyme activities during the decomposition of ...[Read full abstract]
Kourtev, P., Ehrenfeld, J., and Huang, W. (1998). Effects of exotic plant species on soil properties in hardwood forests of New Jersey. Water, Air & Soil Pollution, 105: 493-501.
Two exotic plant species, Berberis thunbergii and Microstegium vimineum, recently have invaded deciduous hardwood forests in the Northeast. We examined changes in soil properties that may be associated with this invasion in three parks in northern New Jersey...[Read full abstract]
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Last modified: Wed Oct 11 17:42:41 EDT 2006