Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 235 for “"size-exclusion"”.
-
Indirect conductivity detection in size exclusion chromatography of small molecules
Size Exclusion Chromatography (SEC) is a liquid chromarographic technique used for the characterization of polymers and polymer related materials and also for the separation of small molecules. The major drawback of SEC is the lack of availability of a universal and true mass detector for providing …
-
The evaluation of crosslinked poly-4-vinylpyridine as a packing material for size exclusion chromatography
… (XPVP) has not previously been used as a size exclusion chromatographic packing material. This material appears attractive for the analysis of nitrogen containing polymers because of its basic nitrogen functionality, and desirable physical properties. Its use as such is investigated with …
-
Design of Mixed-Solvent Extraction and Size-Exclusion Simulated Moving Bed Chromatography to Recover Valuable Compounds from Electronic Waste
More than one million tons of polycarbonates and over 500,000 tons of flame retardants are consigned to landfills each year in the form of waste electrical and electronic equipment. Electronic waste is the fasting growing waste steam at a rate of 3-5% per year. Two separation processes are …
-
Study of the dilute solution properties of various homo- and block co-polymers by variable temperature size exclusion chromatography
The Variable Temperature Size Exclusion Chromatography (VTSEC) was used to study the dilute solution properties of various homo- and block copolymers as well as polymer blends, focus being primarily on the configuration-dependent properties such as average chain dimensions and hydrodynamic behavior …
-
Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
Size exclusion chromatography is the method of choice for characterizing molecular weights and molecular weight distributions of polymers. An important advancement in SEC is multidetection SEC which includes multi-angle laser light scattering, viscometry, refractive index and UV spectroscopy to …
-
Characterization of Enzymes Involved in Bilin Attachment to Allophycocyanin in the Cyanobacterium Synechococcus sp. PCC 7002
… substrate apo-allophycocyanin (HT-ApcAB). Size exclusion HPLC showed that CpcS and HT-CpcU form a 1:1 heterodimeric complex and that HT-ApcAB is present as a monomer (áâ). Absorbance and fluorescence spectroscopy illustrated that both CpcS and HT-CpcU were required to get …
-
Synthesis, Characterization and Electrochemical Properties of Gold Nanomolecules
… out this dissertation are discussed in detail. Size dependent properties of the gold nanomolecules are described. The structure of gold nanomolecules is explained based on the crystal structure of Au25(SCH2CH2Ph)18. The theoretical basis for the stability of the gold nanomolecules is explained …
-
Chromatography of Latex Particles in Packed Columns (Hydrodynamic, Dispersion)
… techniques to the determination of particle size distributions of polymer latexes. In this work, techniques that involve packed columns with either nonporous packing material (termed hydrodynamic chromatography) or porous packing material (termed porous hydrodynamic chromatography or size …
-
Molecular dynamics simulation of nanoporous graphene for selective gas separation
Graphene with sub-nanometer sized pores has the potential to act as a filter for gas separation with considerable efficiency gains compared to traditional technologies. Nanoporous graphene membranes are expected to yield high selectivity through molecular size exclusion effects, while achieving …
-
Living cationic polymerization
… were conducted for these experiments using size exclusion chromatography. These studies indicated that transfer/termination reactions were present. The observed kinetics may be explained by a polymerization mechanism involving a single propagating species which is present in low …
-
Ring-opening metathesis polymerization of 3-substituted cyclooctenes initiated by group 6 alkylidene complexes
… were isolated, characterized by ¹H and ¹³C NMR, size-exclusion chromatography, and differential scanning calorimetry, and hydrogenated to generate the corresponding saturated polymer.
-
Identification and quantification of natural organic matter in the Windhoek operating company water treatment plant in Windhoek, Namibia
… fractions was determined using high pressure size exclusion chromatography (HPSEC) with fluorescence and UV detection methods. Raw water (ponds) had high dissolved organic matter, however this was greatly reduced after the dissolved air flotation, biological and granular activated carbon …
-
Proteomic Identification of Hemp (Cannabis sativa) Seeds by Tandem Mass Spectrometry and Evaluation of Cytotoxic Activity
… techniques, including top-down proteomics, size exclusion chromatography, affinity chromatography, high-resolution ESI QTOF LC/MS/MS, and De Novo protein sequencing bioinformatics tools. The process involved defatting cannabis sativa seeds in hexane and extracting protein in PBS buffer over …
-
Identifying iron-binding antioxidants in New Zealand honeydew honey
… could not be isolated from the XAD-2 resin, size exclusion chromatography was used to separate the honey components based on their molecular sizes. The technique was successsful in separating antioxidants from free sugars in honey. However, size exclusion chromatography did not give any …
-
DNA -Binding Proteins That Facilitate Integration of Transmissible DNA Elements in Bacteroides Thetaiotaomicron
… a biochemical approach utilizing heparin column, size-exclusion and DNA-affinity chromatography, 2-D gel electrophoresis and mass fingerprinting to identify proteins that bound the attachment sites of CTnDOT (attDOT ) and NBU1 (attNI), and stimulated integration in vitro for both DNA elements. The …
-
Investigations into the digestive system proteases of Argiope aurantia (Araneae: Araneidae), hemolytic agents of spider venoms, and the role of both in necrotic arachnidism
… a combination of ion exchange chromatography, size exclusion chromatography, ultracentrifugation, and electrophoresis, an attempt was made to isolate several digestive fluid proteases, and seine protease inhibitors in milligram quantities from the digestive fluid of Argiope aurantia . The …
-
Engineering approaches to control polymer architecture
… Chapter 6 will cover the challenges of size exclusion chromatography for the analysis of bottlebrush polymers. This chapter is a culmination of critical data analysis and practical information to help improve the rigor of polymer characterization by size exclusion chromatography to …
-
Part I: Crystal Engineering Using Trimesic Acid Analogs. Part II: An Extremely Stable Hydrogen-Bonded Hexamer
… and 10% (v/v) DMSO/chloroform. The results of size exclusion chromatography (SEC) with polystyrene standards, as well as comparisons with covalent dendritic control compounds 11 and 23, suggest that the aggregate is a hexamer.
-
The establishment of the oligomeric purity and molecular structure for n-methylated bis(8-hydroxyquinoline) zinc (n = 0, 2, 4, and 5)
… on the device properties. By utilization of size exclusion chromatography it has been determined that the dominant species of nMeq2Zn (n = 0, 4, 5) is tetrameric in crystalline form dissolved in chloroform, in thermally vapor deposited films, and in crystalline form dissolved in chloroform …
-
Interaction Between Two E3 ligases, NEDD8ylated Cullin and HHARI
… and stabilize complex formation. Analytical size-exclusion chromatography, autoubiquitination, and electron microscopy reveal consistent behavior for this triple-mutant. Future structure-based studies will help elucidate the mechanism of the unsolved mystery of RBR activation and its …
Page 1 of 12