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Biomedical subjects

R N Kniseley

Publications and source records attributed to R N Kniseley.

7 recordsLinked to original sources
PubMed1985

Airborne microorganisms in a municipal solid waste recovery system.

The types of bacteria and fungi present in the air of a municipal solid waste recovery system have been characterized and the population densities estimated. Conventional methods were successful in enumerating coagulase-positive staphylococci, Klebsiella spp., gram-negative bacteria, fungi, and common indicator organisms. Selective and enrichment media, however, did not yield Salmonella isolates. Salmonella and Shigella were recovered at a frequency of 3% or less on trypticase soy agar. A broad spectrum of bacteria and fungi were isolated. No evidence has been found that indicates that these organisms have produced adverse health effects.

Air Microbiology↗
PubMed1983

Coupled-column system for quantitating low levels of aflatoxins.

The combination of Styragel and Florisil columns allows recovery of aflatoxins at low levels. Two switching valves between the columns reduce the analysis time and exposure to solvents. Florisil is modified with oxalic acid, allowing recovery of aflatoxins at levels below 500 pg. The method is useful for contaminated corn and peanut meal samples.

Aflatoxins↗
PubMed1981

Precision of the all-glass impinger and the andersen microbial impactor for air sampling in solid-waste handling facilities.

A method was devised to determine the precision of the all-glass impinger and the Andersen six-stage microbial impactor over a wide range of aerosol concentrations like those found in facilities which process solid waste. Simultaneous samples were collected inside a municipal solid-waste recovery system, and the data were treated statistically to estimate the precision of each air-sampling device. All-glass impingers yielded colony counts which indicated a linear relationship between samplers over an observed aerosol concentration of 1.1 X 10(3) to 2.8 X 10(7) colony-forming units per m3 of air. Impactors also yielded colony counts which indicated a linear relationship over an observed aerosol concentration range of 3.9 X 10(3) to 1.9 X 10(5) colony-forming units per m3 of air. The coefficients of variation for the all-glass impinger and the six-stage impactor in an environment with a high and variable dust level were determined to be 0.38 and 0.23, respectively.

Aerosols↗