Crude gliadins were extracted from Canada Western Red Spring (CWRS) wheat flour with 70% (v/v) aqueous ethanol solutions and then lyophilized. Lyophilized crude gliadins were dissolved in 70% (v/v) aqueous ethanol (EtOH) or 4 mM acetic acid (HAc) and the density and ultrasound properties were measured at 20 °C. Good linear relationships of density, ultrasound velocity and ultrasound attenuation with solution concentrations were found. Solvent and sonication effects on the crude gliadins were discussed in terms of the values of the partial specific volume and the partial specific adiabatic compressibility coefficient for crude gliadins. The ethanol soluble crude gliadins had a larger partial specific volume and larger partial specific adiabatic compressibility coefficient than those for acidic soluble crude gliadins. These large values for the physical properties of ethanol soluble crude gliadins were thought to be evidence for the existence of complexes formed by some proteins (ethanol soluble LMW-glutenins and gliadins) and lipids in ethanol solutions and it was also found that the protein-lipid complexes were not destroyed by sonication treatment. Besides, there was no evidence showing that gliadins change with different wheat flours and cause different volume and compressibility properties of crude gliadins.

The thermodynamic properties of bioactive peptides determine how they interact with cellular assemblies. Ultrasonic velocity and density measurements were used to analyse the volumetric properties in aqueous solution of 3 different materials: KCl, bioactive peptides (from hemp seed and dairy proteins), and liposomes (cell membrane models), as well as the interaction between peptides and liposomes. Serial dilutions of the three different materials showed linear relationships between density and concentration and between ultrasonic velocity and concentration. The apparent specific volume and apparent specific compressibility in solution of all materials showed concentration dependence as a result of increased electrostriction as solutions were diluted. The experimental ultrasonic velocities of liposome-dairy peptide mixes were higher than the theoretical additive value, due to interactions between liposomes and peptides. My research demonstrates the benefits of precise volumetric assessments in biological assays.

Mode of access: World Wide Web. / Thesis (Ph. D.)--University of Hawaii at Manoa, 2005. / Includes bibliographical references (leaves 94-111). / Electronic reproduction. / Also available by subscription via World Wide Web / xv, 111 leaves, bound ill. (some col.) 29 cm

Thesis (M.App.Sc.) - Carleton University, 2002. / Includes bibliographical references (p. 102-104). Also available in electronic format on the Internet.

Thesis--California Institute of Technology, 1955. / Also issued in print.

Thesis--California Institute of Technology, 1955. / eContent provider-neutral record in process. Description based on print version record.

Made available in DSpace on 2014-10-09T12:55:24Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:13Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:55:24Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:13Z (GMT). No. of bitstreams: 0 / Este trabalho trata da avaliação da compressibilidade de misturas de pós de nióbio e alumínio, previamente ativadas por moagem de bolas de alta energia. Foram variados o tempo de moagem e a quantidade de ácido esteárico, adicionado como agente controlador de processo (ACP), assim como o tamanho médio de partícula do pó de alumínio. Os pós de partida e as misturas moídas foram caracterizados por microscopia eletrônica de varredura (forma das partículas) e por difração de raios laser (distribuição granulométrica). Uma máquina universal de ensaios foi utilizada nos testes de compressibilidade mediante compactação das amostras numa matriz cilíndrica de aço-ferramenta. Os dados de compressibilidade foram comparados graficamente segundo curvas de densidade (relativa) versus pressão. As diferenças de comportamento na compactação das amostras foram correlacionadas com as diferentes condições de moagem. Houve um decréscimo da compressibilidade com o aumento do tempo de moagem e da quantidade de ACP. Menos compressíveis foram também as misturas provenientes do pó de alumínio com maior tamanho de partícula. Uma nova equação de compactação foi ainda proposta, cujo ajuste aos dados deste trabalho foi superior aos verificados nas equações de modelos anteriormente publicados. / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

The Florida Everglades is considered as a vulnerable wetland composed primary of organic rich peat soils, experiencing saltwater intrusion. Impact of increasing salinity on the strength and deformation properties of peat is unknown. A laboratory study was undertaken to evaluate how the growing salinity level due to sea level rise may alter the compressibility behavior of the Everglades soils. Sixteen 1-dimensional oedometer tests were conducted on undisturbed Everglades peat soils in two phases. Phase I included samples from Site 1 (saltwater) and Site 3 (freshwater) without any salinity addition. Phase II consisted of soil from Site 3 (freshwater) saturated in six different levels of salinity artificially added to the samples. Compressibility properties investigated in this study include compression index (Cc), coefficient of consolidation (Cv), hydraulic conductivity (K), and the Ca/Cc ratio. In general, it was observed that the increase in salinity beyond a threshold value tends to increase the soil compressibility properties, indicating a possible reduction in soil stability with saltwater intrusion. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

Yes / A detailed steady state FCC riser process model is simulated for the first time with different compressibility (Z) factor correlations using gPROMS software. A 4-lump kinetic model is used where gas oil cracks to form gasoline, coke and gases. The usual practice has been the assumption that the FCC riser gas phase is an ideal gas at every point under any condition (varying C/O ratio, riser diameter, operating temperature and pressure, etc.). This work found that the Z factor varies at every point across the riser height depending on riser operating pressure and temperature, diameter and C/O ratio. It also shows that the magnitude of deviation of a gas phase from ideal gas behaviour can be measured over the riser height. The Z factor correlation of Heidaryan et al. (2010a) is found to be suitable for predicting the Z factor distribution in the riser. / Petroleum Technology Development Fund, Nigeria