503,175 research outputs found
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
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Inorganic methods for ¹⁹F magnetic resonance-based biosensing
No full textFluorine magnetic resonance imaging (¹⁹F MRI) is a promising bioimaging technique due to the favorable magnetic resonance properties of the ¹⁹F nucleus and the lack of detectable biological background signal. One intriguing opportunity in ¹⁹F magnetic resonance molecular imaging is to design responsive agents that can serve as a readout of biological activity, including but not limited to the activity of enzymes, redox activity, the activity of ions, etc. Paramagnetic centers have the ability to enhance relaxation rates of nearby ¹⁹F nuclei through paramagnetic relaxation enhancement (PRE). Further, metals with anisotropic unpaired electrons can induce changes in ¹⁹F chemical shift through the pseudo-contact shift (PCS) effect. Paramagnetic agents are therefore well suited for this activity-based sensing as metal complexes can be designed to respond to specific biological activities and give a corresponding ¹⁹F response that results from changes in the metal complex structure and subsequently effect of PRE/PCS. In this thesis, we demonstrated the application of copper (Chapter 2-4) and nickel (Chapter 5-6) complexes as redox- and coordination-based sensors, respectively, for ¹⁹F magnetic resonance biosensing. Fluorinated CuATSM derivatives were prepared for sensing biological hypoxia due to its one-electron Cu²⁺/Cu⁺ redox well matched with cellular reduction potential under hypoxia and its fluorine MR signal effectively attenuated and restored between Cu²⁺ and Cu⁺ state. Prepared probes CuATSM-F₃ (Chapter 2), Cu4 (Chapter 3), and CuL₁ (Chapter 4) possessed an appropriate potential for hypoxia selectivity, and reduction to diamagnetic Cu⁺ complex and ligand dissociation to regenerate the ¹⁹F signal was demonstrated by NMR in cells grown under low O₂ tension. The successful employment of these Cu probes facilitates the translation to in vivo hypoxia sensing via ¹⁹F MR-based techniques. The development of Ni-based probes enables expansion of biosensing strategies and applications beyond biological redox. Proof-of-concept Ni probes based on dioxocyclam (Chapter 5) and side-bridged cyclam (Chapter 6) ligand framework exhibited the magnetic switching properties of the Ni²⁺ center in aqueous media and the potential to couple with ¹⁹F NMR/MRI to achieve sensing of pH, light irradiation and enzymatic activities in living biosystems.Chemistr
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
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Cysteine responsive copper(II) based ¹⁹F MRI probes
No full textCysteine plays an important role upholding cellular homeostasis by maintaining a proper redox environment. Perturbations in cysteine concentration may lead to cardiovascular and liver disease, and cancer, making cysteine an important amino acid to detect and monitor. In order to detect cysteine in vitro and in vivo it is advantageous to choose an imaging tool with high tissue penetration, low background noise, and less radiation, which led us to ¹⁹F MRI. Herein we report a series of copper complexes with fluorine moieties appended to the macrocycle cyclam for use of ¹⁹F MRI detection of cysteine. In this study, an efficient “turn-on” response was observed upon reduction of the Cu(II) complexes by cysteine. This response was characterized using UV/Vis absorption spectroscopy, NMR, EPR, and ¹⁹F MRI. Early biological results suggest that these probes can detect cysteine in red blood cells, opening the doors for further animal studies.Chemistr
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Maine author Franklin F. Gould recalls his first glimpse of the outside world
No full textMaine author Franklin F. Gould recalls his first glimpse of the outside world as he relates how, as a young farm boy in the late 1800\u27s, he drove his father\u27s horses on an errand to an icebound river
Mapping the Discipline of the Olympic Games An Author-Cocitation Analysis
No full textThe authors conducted an author cocitation analysis on prominent authors writing about the Olympics during the 1990s. Author cocitation is an established bibliometric technique that can be used to measure the relative similarities of topics written about by the cited authors. This enables a visual representation of the “intellectual space” of the discipline, in this case the Olympics, to be created for the period under review. So core and peripheral research areas are identified, along with their major contributors. The representation appears as a two-dimensional cluster-enhanced map. Subject expertise was then applied to the results to place labels on the generated clusters of authors and their topics
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