This research investigates interacting biological, chemical, and physical factors affecting the efficiency of microbiological wastewater treatment at the W. J. Smith Wood- Preserving Company in Denison, Texas. The treatment process consisted of collecting exhaust boiler water containing unidentified boiler treatment compounds, steam condensate contaminated with preservatives and wood extracts, plant process waters, and rainfall runoff from plant grounds. With a 5-minute residence time, wastewater was passed over 2 oxidation towers in series, each containing approximately 47,000 square feet of surface area. Suspended solids were removed from the wastewater before discharge. Various amino acids such as serine, aspartate, cysteine, phenylalanine, alanine, proline, glycine, histidine, and tyrosine significantly stimulated phenol degradation in the laboratory. The plant wastewater contained approximately 0.1 mg/l of several of the stimulatory amino acids. It was assumed that these concentrations provided maximal stimulation in the field situation. The plant wastewater also contained sufficient nitrogen to permit the organisms to degrade up to 100 mg phenol/1 of water examined. Amino acids in the wastewater probably serve as a source of microbial nutrition. Toxicity of the wastewater to fish was not caused by the presence of phenol, phenol degradation products, or traces of pentachlorophenol. The wastewater was rendered non-toxic by …

The problem with which this investigation was concerned was the comparison of cedar elm populations in different stands along creeks in Denton County, Texas, and the relationship of certain population parameters to various substrates present at stand sites, Parameters investigated eluded average basal area, basal-area density, transect-segment density, intertree distance, lateral distance, frequency, diameter breast-high, diameter breast-high size-class distribution, and immature-tree density. Variations among populations of Ulmus crassifolia Nutt were noted and analyzed in terms of soil particle size and existing community conditions.

The purpose of this study was to extend our understanding of the ecological relationships of P. aeruginosa by investigating the differences or similarities between the strains of this organism found in sewage and those found as pathogens in human infections. This research was approached by comparing the serological types of P. aeruginosa isolated from sewage contaminated waters in Argentina (South America) to those isolated from sewage contaminated waters in Texas. They were typed with sera obtained using P. aeruginosa isolated from human infections. The data obtained revealed that bacteria isolated from sewage in Texas and from soil and water in Argentina are antigenically similar to those isolated from human infections.