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Full-Text Articles in Physical Sciences and Mathematics
Study Of Acetone Extractable Organic Matter From Airborne Particulate Matter From An Urban Site, Wenhui Wu
Study Of Acetone Extractable Organic Matter From Airborne Particulate Matter From An Urban Site, Wenhui Wu
Theses
Two seasonal periods (Winter 1988; Summer 1988) of daily Newark urban air samples were collected on glass fiber filters. Each filter was first extracted with dichloromethane and subsequently with acetone. Quarterly composites of each were then tested for mutagenicity. The results of the analysis of the less polar dichloromethane extracts were reported in the thesis of Junghen Lwo. A modified fractionation scheme involving acid-base partitioning and silica gel column chromatography has been used as the first step in the bioassay-directed search for significant levels of mutagenic compounds in extracts of inhalable (IP 10) ambient air particulates. The biologically "hot" fractions …
Substituent Effects On Strained Rings. Part A ; The Kinetics Of Hydrolysis Of A Quinuclidone Using Ftir. Part B, Yeu-Yi Chiu
Substituent Effects On Strained Rings. Part A ; The Kinetics Of Hydrolysis Of A Quinuclidone Using Ftir. Part B, Yeu-Yi Chiu
Theses
PART A: The energies of a series of monosubstitued propane, cyclopropane and cyclopropene compounds were calculated using ab initio molecular orbital calculations optimized at the 3-21G level using Gaussian 82 and Gaussian 86 programs. The effects of substituents on stabilization energies and geometries are rationalized with respect to the parent molecules. The result is presented which indicated that for substituted cyclopropyl and cyclopropenyl compounds, most of the substituents induce stabilization except the —NC substituent group is destabilizing in cyclopropyl and cyclopropenyl systems. Indications of relative electrostatic and resonance effects are also analyzed. A linear free energy relationship has been exam-ined …
Synthesis Of Highly-Strained Gem-Difluoro Compounds By Reaction Of Difluoromethylene With Cycloalkenes, Deyi Yang
Theses
Trans-Cyclooctene is thought to be more reactive than cis-cyclooctene due to its trans-structure. When cis or trans-clooctene reacts with difluormethylene (:CF2), trans-9,9-difluorobicyclo[ 6,1,0] nonane was generated in much higher yield than cis-9,9-difluorobicyclo[6,1,0]nonane. [PhCF3P+CF2Br]Br- was chosen to be the difluoromethylene precursor in this study. The reason was that the reaction condition for trans-cyclooctene and :CF2 should be at low temperature. Only [PhCF3P+CF2Br]Br- could generate CF2 at lower temperature (e.g. room temperature). We succeeded in the synthesis of trans-9,9-difluorobicyclo[6,1,0]nonane and its cis isomer and …
Determination Of Benzo(A)Pyrene Metabolites In The Bile Of Winter Flounder From The New York Bight, Xingmin Liu
Determination Of Benzo(A)Pyrene Metabolites In The Bile Of Winter Flounder From The New York Bight, Xingmin Liu
Theses
A method for detecting the concentration of BaP Metabolites in fish tissues has been developed. The analytical procedure includes extraction of PAH and BaP Metabolites from fish bile, liver extract and muscle extract; reduction of metabolites to BaP using hydriodic acid; and subsequent analysis of the BaP by thin layer chromatography with fluorescence detection. The method is applied to tissues from fish collected from polluted as well as clean reference waters and experimental tanks with dilutions of treated industrial wastewater. Experimental results on one kind of bottom-dwelling fish, winter flounder, which comes from the Hudson-Raritan Estuary, NY, where the water …