Thesis (Ph. D.)--Johns Hopkins University, 1921. / Biography.

Thesis (Ph. D.)--John Hopkins University, 1920. / Biography.

Thesis (Ph. D.)--University of Chicago, 1938. / Reproduced from type-written copy. "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois." Includes bibliographical references.

Thesis (Ph.D.)--University of Delaware, 2009. / Principal faculty advisor: Christopher J. Roberts, Dept. of Chemical Engineering. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1956. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

No description available.

A systematic study of the excess thermodynamic properties of two-ring compounds and n-alkanes was conducted. The excess enthalpies were determined at 288,15 K and 298,15 K by using a flow microcalorimetric technique. The excess volumes of tetralin and cycloalkanes, and tetralin and --alkans at 288,15 K and 298,15 K were determined by using a vibrating tube densitometer. The results showed trends relating to the size and shape of the n-alkane and cycloalkan molecules. The theory developed by Flory was applied to the decalin + cycloalkane and + n-alkane systems and this gave qualitative predictions of the excess enthalpies from the excess volumes and vice versa. / KMBT_363 / Adobe Acrobat 9.53 Paper Capture Plug-in

The PsbQ protein (16.5 kDa) is an extrinsic protein found in the thylakoid membrane of higher plants and green algae. As a member of the Psb protein family, it is situated in the oxygen evolving center and takes part in the water splitting reaction. The stable oxygen production in photosystem II depends on the cooperation of PsbQ with other photosynthetic proteins, mainly PsbP. In order to identify the possible interaction sites, the tertiary structure in solution has to be determined. Although the X-ray crystallographic structure of PsbQ was determined previously, the conformation of residues 14-33 (so-called "missing link") was still unknown at the onset of this work. The initial backbone assignment as well as a secondary structure estimation were achieved recently. In this thesis the resonance assignment was extended and 15N as well as 13C NOESY-HSQC spectra were recorded to obtain structural constraints. The solution structure was determined using the program CYANA. The results obtained show that, while the four helix bundle domain is nearly identical compared to the available X-Ray crystallographic structure significant deviations occur in the N-terminal region. In particular, the residues 37-41, where a short ?-strand had been proposed in the crystal structure, exhibit high ?-helical propensity.

Made available in DSpace on 2014-10-09T12:54:34Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:09:26Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP

Orientador: José Antonio Malmonge / Resumo: Micro e nanofibras poliméricas têm despertado grande interesse de pesquisadores devido as suas potencialidades em diversas aplicações, atribuídas principalmente à grande área superficial destes materiais em associação com as propriedades dos polímeros. Uma das técnicas utilizadas para produção de micro e nanofibras é a solution blow spinning (SBS), ou fiação por sopro em solução. Neste trabalho foram obtidas microfibras de blendas de Poli(fluoreto de Vinilideno) (PVDF) e Poli(o-metoxianilina) (POMA), com a POMA em seu estado dopado e não dopado, pela técnica SBS. Para a dopagem da POMA foi utilizado o ácido p-toluenosulfônico (TSA). Obteve-se mantas com concentrações de PVDF/POMA-TSA de até 85/15 (m/mtotal), e de até 90/10 (m/mtotal) para PVDF/POMA. Foi possível observar a partir das imagens de MEV que os diâmetros médios das fibras diminuíram com o aumento da concentração de POMA, chegando a 0,22 µm para a maior proporção. Essa variação no diâmetro das microfibras é atribuído a variação da viscosidade da solução que diminui com o conteúdo da POMA na blenda. Os difratogramas de raios X indicaram que tanto a fase α quanto a fase β do PVDF foram obtidas no processo de fiação tanto para o PVDF puro bem como para a blendas, mostrando que o conteúdo de POMA na blenda não altera a fase do PVDF. A condutividade elétrica das fibras aumentou significativamente com a porcentagem de POMA (dopada) na blenda, elevando os valores em até 8 ordens de grandeza e atingindo uma condutividade ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Micro and polymeric nanofiber have arisen great interest of researchers because of their potential in various applications, mainly attributed to the large surface area of these materials in association to the properties of polymers and polymer blends. One of the techniques used for producing micro and nanofibres is the solution blow spinning (SBS). In this study microfibers of poly (vinylidene fluoride) (PVDF) and poly (o-methoxyaniline) (POMA) blends were obtained, with POMA in its doped and undoped state, by SBS technique. For POMA doping it was used p-toluenesulfonic acid (TSA). Mats with PVDF / POMA-TSA concentrations of 85/15 (m /mtotal), and up to 90/10 (m /mtotal) to PVDF / POMA were obtained. It was possible to observe from SEM images that the average fiber diameters decreased with increasing concentration of POMA, reaching 0,22μm at the highest proportion. The X-ray diffractograms showed that both α phase and β phase of PVDF were obtained in the spinning process. Such phases didn’t have their formation affected by the variations on the bend concentration. The electrical conductivity of the fibers increased significantly with the percentage of POMA (doped) in the blend, increasing values up to 108 orders of magnitude and reaching a conductivity of about 10-4 S/cm for the mats of PVDF/POMA on the reason 85/15. Furthermore, the mats of the blend showed good thermal stability up to the temperature of 200 °C. / Mestre