P. Churchill

Publications64
h-index25
Citations2,389
Highly Influential Citations101
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Anaerobic redox cycling of iron by freshwater sediment microorganisms.
The potential for microbially mediated anaerobic redox cycling of iron (Fe) was examined in a first-generation enrichment culture of freshwater wetland sediment microorganisms. Most probable number… Expand
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Ultrastructural and molecular phylogenetic delineation of a new order, the Rhizophydiales (Chytridiomycota).
In the order Chytridiales, Rhizophydium is a morphologically defined genus based upon the production of a monocentric, inoperculate, epibiotic sporangium, an endobiotic rhizoidal axis which branches,… Expand
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A simple, efficient method for the separation of humic substances and DNA from environmental samples.
Three different gels (Sepharose 4B, Sephadex G-200, and Sephadex G-50) were evaluated as a means of removing humic contaminants from DNA extracts of environmental samples. Sepharose 4B gave superior… Expand
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Isolation and Characterization of aMycobacterium Species Capable of Degrading Three- and Four-Ring Aromatic and Aliphatic Hydrocarbons
ABSTRACT Mycobacterium sp. strain CH1 was isolated from polycyclic aromatic hydrocarbon (PAH)-contaminated freshwater sediments and identified by analysis of 16S rDNA sequences. Strain CH1 was… Expand
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SUCCESSIONAL CHANGES IN BACTERIAL ASSEMBLAGE STRUCTURE DURING EPILITHIC BIOFILM DEVELOPMENT
Although bacteria are often treated as one entity in ecological studies, bacterial assemblages are composed of individual species populations. Bacterial assemblages can have their own richness and… Expand
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Rhizophlyctidales--a new order in Chytridiomycota.
Rhizophlyctis rosea (Chytridiomycota) is an apparently ubiquitous, soil-inhabiting, cellulose-degrading chytrid that is the type for Rhizophlyctis. Previous studies have revealed multiple zoospore… Expand
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Ultrastructural and molecular analyses of Rhizophydiales (Chytridiomycota) isolates from North America and Argentina.
The Rhizophydiales is the most recently circumscribed order in the Chytridiomycota. Past studies focused on soil chytrids from North America and Australia to determine the range of diversity within… Expand
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Topological studies of cytochromes P-450scc and P-45011 beta in bovine adrenocortical inner mitochondrial membranes. Effects of controlled tryptic digestion.
The topology of the steroid hydroxylase complexes in bovine adrenocortical mitochondria were studied by using controlled digestion with trypsin of purified inner mitochondrial membranes. Inhibition… Expand
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Polymorphism of human cytochrome P-450.
The cytochrome P-450 forms involved in debrisoquine 4-hydroxylation (P-450DB), phenacetin O-deethylation (P-450PA), S-mephenytoin 4-hydroxylation (P-450MP), and nifedipine 1,4-oxidation (P-450NF)… Expand
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Changes in Bacterial Species Composition in Enrichment Cultures with Various Dilutions of Inoculum as Monitored by Denaturing Gradient Gel Electrophoresis
ABSTRACT Denaturing gradient gel electrophoresis revealed changes in the bacterial species obtained from enrichment cultures with different inoculum dilutions. This inoculum dilution enrichment… Expand
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