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Full-Text Articles in Physical Sciences and Mathematics
Resolution Modeling Of Length Tuning In Gas Chromatography, James P. Grinias
Resolution Modeling Of Length Tuning In Gas Chromatography, James P. Grinias
Senior Honors Theses and Projects
Tunable selectivity provides a relatively simple and inexpensive way to manipulate peak positions and gain resolution in chromatographic separations. Length tuning utilizes two columns of different polarities connected in series. Selectivity is manipulated by changing the relative lengths of the two columns. However, a direct correlation is not seen between relative length and effective contribution due to gas compression effects. Rather, a direct correlation is observed between the carrier gas transport time through a segment of column (relative to the total carrier gas transport time) and the effective contribution of that segment. This relationship has been used to predict retention …
A Density Functional Study Of The Relative Stability Of Intermediates In A Mcmurry Coupling Reaction, Andrew Jozef Livingston
A Density Functional Study Of The Relative Stability Of Intermediates In A Mcmurry Coupling Reaction, Andrew Jozef Livingston
Senior Honors Theses and Projects
Reductive cyclization via McMurry coupling is a common way to form pyrrolizidine rings. In this work we investigate the titanium-catalyzed McMurry coupling reaction leading to a pyrrolizidine alkaloid using density functional methods. Specifically, we compare the relative energies of all possible pinacolate intermediates at the UB3LYP/6-31G level of theory. The most stable intermediate is found to be the one resulting from C-O bond insertion in the ester group. The McMurry product is not predicted to form.
Qualitative Thm-Gc-Ms Analysis Of Proteins And Amino Acids In Rock Painting Binders, Melissa Doolin
Qualitative Thm-Gc-Ms Analysis Of Proteins And Amino Acids In Rock Painting Binders, Melissa Doolin
Senior Honors Theses and Projects
A vital step to radiocarbon dating rock paintings involves the characterization of organic material in the paint. Using THM-GC-MS we have created a library of mass spectrometric data on possible organic binders, to compare to authentic paint samples. To reduce interference from contaminants and the mineral background, we are developing a simple purification technique to extract proteins and carbohydrates from these samples. Separating the organics can greatly enhance our results for GC-MS identification and subsequent radiocarbon analysis by accelerator mass spectroscopy.
Isolation And Analysis Of Cyanobacterial Dna, Tiffany Crosby
Isolation And Analysis Of Cyanobacterial Dna, Tiffany Crosby
Senior Honors Theses and Projects
Cyanobacteria are a phylum of bacteria that possess a diverse number of biological characteristics. One of the evolutionary innovations of the cyanobacteria are its ability to perform oxygenating photosynthesis, which all cyanobacteria are able to perform. It is believed that a form of metabolism became the dominant method for producting fixed carbon from carbon dioxide (CO2) at around 3.5 billion years ago. Instead of using hydrogen sulfide, whose generated waste products were difficult to eliminate, the photosynthetic cyanobacteria used water as their hydrogen source (1). Many cyanobacteria are also capable of fixing atmospheric nitrogen (2). Cyanobacteria are present …