Photophysics, Molecular Reorientation in Solution and X-Ray Structure of a New Fluorescent Probe 1,7-Diazaperylene

A new fluorescent molecule 1,7-diazaperylene (DP) has been investigated by means of time-resolved and steady-state polarized fluorescence spectroscopy, as well as X-ray spectroscopy. Absorption and fluorescence spectra of DP in solution are similar to those of perylene. However, absorption and fluorescence spectra of 2,8-dimethoxy DP and 2,8-dipentyloxy DP in solution are red-shifted by ca. 55 nm relative to perylene. The fluorescence decay of DP is exponential with a lifetime of 5.1 ns in ethanol, 4.9 ns in glycerol and 4.3 ns in paraffin oil. The radiative lifetime in ethanol was calculated to be 6.3 ns for DP, 8.0 ns for 2,8-dimethoxy DP and 7.6 ns for 2,8-dipentyloxy DP. The calculated fluorescence quantum yields of 0.8 for DP and its alkoxy derivatives in ethanol, are in good agreement with those obtained from measurements. The calculated Förster radius is 37.2 ± 1 Å for DP and 41.9 ± 1 Å for its alkoxy derivatives in ethanol. Examining the S0 S1 transition, we obtain a limiting fluorescence anisotropy of r0 0.38 for DP and its alkoxy derivatives. The rotational rates of DP in paraffin oil and glycerol were compared to that of perylene. In paraffin oil both molecules show an almost identical biexponential decay of the fluorescence anisotropy, which is compatible with a rotational motion like an oblate ellipsoid. The fluorescence anisotropy is monoexponential for DP in glycerol, and DP appears to rotate like a spherical particle while perylene in glycerol appears to rotate like an oblate ellipsoid. Moreover, the rotational diffusion constant, corresponding to rotation about an axis in the aromatic plane (D), is the same for both DP and perylene in glycerol

Author

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Pulitzer-Prize winning author John Toland will be the featured speaker at today's meeting of the Northwest Rotary Club.

Maximum energy for life : a 21-day strategic plan to feel great, reverse the aging process, and optimize your health

xii, 260 p. : ill. ; 25 cm

Conspiratorial Framing : Framing as a Tool in the War on Information

This research aims to understand the frames used by conspiracy theorists by establishing a new pathway in media framing, or in other words a media framing micro-theory, called conspiratorial framing​. The aims are accomplished through a critical analysis of the case of Alex Jones, a conspiracy theorist, and InfoWars, the media channel through which Jones operates. Through frame analysis, accomplished by implementing the methods of thematic content analysis and visual analysis then applying frame analysis to the results of those methods, this research explores the ways Jones and InfoWars give meaning to the events portrayed in the conspiracy theories perpetuated on InfoWars programs. The qualitative data analysis in this research, constituted by thematic content analysis and visual analysis, uses open coding to extract themes from transcribed data while the methodological guidance of frame analysis, supplemented by theories regarding representation and reality construction, provides a theoretical background for this research. These methods and methodologies are applied to the empirical material of 14 YouTube videos. The thematic content analysis is applied to transcriptions of the videos, and the visual analysis is performed on the videos themselves. The 14 videos, published on YouTube between the years of 2011 and 2017, total about two hours of richly dense content. This dissertation culminates in the development of the “conspiratorial framing” grounded theory, defined by the establishment of a typology of conspiratorial frames present in and extracted from InfoWars broadcasts. The conspiratorial framing typology that this research develops consists of five thematic frames, which are ​fearmongering​, ​disdaining institutions​, nationalism​, ​demonizing political others​, and ​methods of validation​. This research not only contributes to media framing, but also, and arguably more importantly, to the broader fields of thought regarding media representation and the mediated construction of reality. By adding the new facet of conspiratorial framing to the current understanding of the media landscape—as defined by the complex web of intertextuality between not only different facets of media, but also media and the consumer—a better understanding can be gained of how information is presented, re-presented, and ultimately understood in this digitally mediated world. This focus on conspiracy theories as part of the mediated web of our digital world will ultimately help shine a light on the nature of truth, fact, and reality

A study of liquid crystalline systems by deuterium magnetic resonance

SIGLEAvailable from British Library Document Supply Centre- DSC:D72196/87 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Author

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Pulitzer-Prize winning author John Toland will be the featured speaker at today's meeting of the Northwest Rotary Club.