Don E Langworthy

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The phenotypic and genotypic adaptation of a freshwater sedimentary microbial community to elevated (22 to 217 microgram [dry weight] of sediment-1) levels of polycyclic aromatic hydrocarbons (PAHs) was determined by using an integrated biomolecular approach. Central to the approach was the use of phospholipid fatty acid (PLFA) profiles to characterize the(More)
The attachment of waterborne pathogens onto surfaces can be increased by coating the surfaces with positive charge-enhancing polymers. In this paper, the increased efficacy of polydiallyldimethylammonium chloride (p-DADMAC) coatings on glass was evaluated in a parallel plate flow chamber with the use of waterborne pathogens (Raoultella terrigena,(More)
Polycyclic aromatic hydrocarbons (PAH) are widespread environmental contaminants that can, under proper conditions, be degraded by microorganisms. The responses of a riverine sedimentary microbial community to PAH contamination were examined using an integrated biochemical assay that yielded data on PAH concentration, total microbial biomass, and microbial(More)
Contamination of drinking water by microorganisms and arsenic represents a major human health hazard in many parts of the world. An estimated 3.4 million deaths a year are attributable to waterborne diseases. Arsenic poisoning from contaminated water sources is causing a major health emergency in some countries such as Bangladesh where 35 to 77 million(More)
In rural areas around the world, people often rely on water filtration plants using activated carbon particles for safe water supply. Depending on the carbon surface, adhering microorganisms die or grow to form a biofilm. Assays to assess the efficacy of activated carbons in bacterial removal do not allow direct observation of bacterial adhesion and the(More)
Methodological and practical difficulties have limited the growth of knowledge about outcome of psychiatric hospital treatment. The authors report on outcome at hospital discharge for 103 long-term and 93 short-term patients treated at the C. F. Menninger Memorial Hospital, part of an ongoing follow-up study of hospital treatment. Discharge outcome is based(More)
Activated carbons remove waterborne bacteria from potable water systems through attractive Lifshitz-van der Waals forces despite electrostatic repulsion between negatively charged cells and carbon surfaces. In this paper we quantify the interaction forces between bacteria with negatively and positively charged, mesoporous wood-based carbons, as well as with(More)
Waterborne diseases constitute a threat to public health despite costly treatment measures aimed at removing pathogenic microorganisms from potable water supplies. This paper compared the removal of Raoultella terrigena ATCC 33257 and Escherichia coli ATCC 25922 by negatively and positively charged types of activated carbon particles. Both strains display(More)
The C. F. Menninger Memorial Hospital is conducting an ongoing follow-up study of the effects of extended hospitalization. The authors report key indicators of outcome at one year postdischarge for 110 patients hospitalized on extended care units for at least 180 days. Outcome is determined by postdischarge rates of rehospitalization, postdischarge suicide(More)
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