A study was conducted to determine the quantity and distribution
of bark debris resulting from log rafting. Three distinct problems were
studied: (I) the quantity of bark dislodged from the logs while being
placed in the rivers and during transport in log rafts; (2) the percentage
of the bark that...
Metal Organic Framework (MOF) materials, consisting of metal ions with organic linkers, have a functional cavity structure which can be utilized in applications such as catalyst, micro sensing, and gas absorption. Due to MOF materials' selective gas adsorption property, interest in MOF materials has intensified in the last few years,...
Chlorinated low molecular weight solvents have been discovered in a
number of the nation's groundwater supplies. Remediation of these aquifers will
require some form of treatment. Presently, the dominant treatment method is air
stripping which results in transfer of the solvent from the aqueous phase into the
atmosphere. Biodegradation is...
Two strategic approaches to water quality control in Oregon's
Willamette River are presently being utilized: point source treatment
and flow augmentation. Dry weather releases from reservoirs are for
authorized purposes other than water quality. Reservoirs can participate
in pollution control by summer flow augmentation where authorized water
resource objectives (flood...
Cometabolic biodegradation processes are potentially useful for the
bioremediation of hazardous waste sites. In this study the potential application of phenol-oxidizing
and nitrifying bacteria as "priming biocatalysts" was examined in the
degradation of polycyclic aromatic hydrocarbons (PAHs), aryl ethers, and aromatic
ethers. We observed that a phenol-oxidizing Pseudomonas strain cometabolically...
The toxic effects of degrading the chlorinated hydrocarbons
trichloroethylene (TCE), chloroform (CF) and cis-1,2-dichloroethylene (cis-1,2-DCE) were studied in the bacterium Nitrosomonas europaea. N europaea is an
ammonia-oxidizing bacterium that obtains all of its energy from the oxidation of
ammonia to nitrite. This metabolic process involves two enzymes, ammonia
Mycobacterium vaccae JOB5 and Graphium sp. were studied to
evaluate their ability to cometabolize methyl tert-butyl ether (MTBE) and its
metabolites after growth on two different alkanes, propane and iso-pentane.
Both cultures were capable of cometabolizing MTBE and the metabolites,
tert-butyl formate (TBF) and tert-butyl alcohol (TBA). MTBE, TBF, and...
Chlorinated phenols are toxic compounds and often released into natural
environments from improper disposal or non-point sources. One important factor in
assessing the environmental fate and transport is the rates of microbial degradation in
soils and natural waters. In this study, eight chlorophenols (4-chlorophenol (4-CP),
2,4-dichlorophenol (2,4-DCP), 3,4-dichlorophenol (3,4-DCP), 3,5-dichlorophenol...