Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:digitalcommons.kennesaw.edu:mscs_etd-1034". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Kennesaw State University

1. Garcia, Estefania. Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions.

Degree: MSCB, Chemistry, 2020, Kennesaw State University

On this planet the development of life requires six essential elements: C, H, O, N, P, and S. These elements are present in gaseous form, with the exception of phosphorus, which is primarily found in solid mineral sources. Phosphorus in biological systems is significant through its involvement in metabolic functions (e.g., Coenzyme A), cell structure (i.e., phospholipid membranes), and genetic storage/transfer (i.e., phosphodiester bonds in DNA and RNA). However, an ambiguity remains with the assimilation of phosphorus in biological systems, caused by its habitual presence in insoluble phosphate mineral sources. Recent research has found that insoluble phosphate minerals, when combined with urea-rich solvents, can release sequestered phosphate into solution and promote mineral transformation to more soluble secondary minerals. Our study investigates surface interactions of hydroxyapatite, a prebiotically plausible phosphate mineral source on the early Earth, with urea-rich solvents (urea, ammonium formate, and water, UAFW) and magnesium sulfate. Time-dependent infrared studies were conducted via polarization modulated – infrared reflection-absorption spectroscopy (PM-IRRAS) to monitor structural changes of the mineral surface. Thin hydroxyapatite films were analyzed with scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), and PM-IRRAS before and after reaction. Phosphate depletion was observed with PM-IRRAS and was supported by more established instrumentation including nuclear magnetic resonance spectroscopy (NMR) and energy dispersive x-ray spectroscopy (EDX). Film corrosion was observed by post-reaction characterization, and ammonium formate was found to activate orthophosphate release into solution. Advisors/Committee Members: Heather Abbott-Lyon, Altug Poyraz, Huggins Msimanga.

Subjects/Keywords: origins of life; phosphate problem; infrared spectroscopy; astrobiology; surface science; Chemistry; Geochemistry; Other Astrophysics and Astronomy

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Garcia, E. (2020). Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions. (Thesis). Kennesaw State University. Retrieved from https://digitalcommons.kennesaw.edu/mscs_etd/33

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Garcia, Estefania. “Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions.” 2020. Thesis, Kennesaw State University. Accessed July 08, 2020. https://digitalcommons.kennesaw.edu/mscs_etd/33.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Garcia, Estefania. “Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions.” 2020. Web. 08 Jul 2020.

Vancouver:

Garcia E. Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions. [Internet] [Thesis]. Kennesaw State University; 2020. [cited 2020 Jul 08]. Available from: https://digitalcommons.kennesaw.edu/mscs_etd/33.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Garcia E. Mineral-Surface Chemistry of Hydroxyapatite and Urea-Rich Solutions. [Thesis]. Kennesaw State University; 2020. Available from: https://digitalcommons.kennesaw.edu/mscs_etd/33

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.