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    Piezoelectric Polymers: Direct Converters of Work to Electricity

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    Discovery of piezoelectricity and piezoelectric materials (including polymers)

    Molecular-Cloning, Sequence-Analysis and Expression of Human Pituitary Glutaminyl Cyclase

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    A cDNA clone for glutaminyl cyclase was isolated from a human pituitary cDNA library and the complete DNA sequence determined. The cDNA clone had 1573 bp and contained an open reading frame of 1086 bases, coding for a protein of 361 amino acids and molecular mass of 40 876 Da. The predicted amino acid sequence of the human cDNA showed 86% sequence identity to the previously reported bovine glutaminyl cyclase sequence. A comparison of the amino acid sequences derived from the human and bovine cDNAs showed that several glycosylation and phosphorylation sites as well as two cysteine residues (Cys139, Cys164) were conserved. The human cDNA was cloned into the Escherichia coli expression vectors pMALc2 and pET19b. Expression of this cDNA in either vector resulted in the production of a glutaminyl cyclase fusion protein which was enzymatically active and reacted with anti-bovine glutaminyl cyclase antisera. Substrate specificity studies with the recombinant enzyme suggested a bias against acidic and tryptophan residues adjacent to the N-terminal glutaminyl residue and a lack of importance of chain length after the second residue

    Suppressing Convective Instabilities in Propagating Fronts by Tube Rotation

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    Density gradients caused by thermal and solutal gradients often cause double-diffusive and/or Taylor instabilities in propagating fronts. These instabilities manifest themselves as “fingering” that can affect the front shape and velocity and, in extreme cases, destroy the front. This is especially a problem with propagating fronts of polymerization when a monomer is used that does not produce a cross-linked polymer. We have found that it is possible to suppress the fingering by rotating the tube around the long axis of the tube. With the chlorate−sulfite system and methacrylic acid polymerization system, we found that the front velocities exhibited a fourth-order dependence on the rotational frequency, and the front shapes were parabolic. The amplitudes of the deviation of the fronts from a planar front exhibited a second-order dependence on the rotational frequency but not exactly as predicted from the hydrostatic analysis of a rotating fluid

    Chemical Waves in the Iodide-Nitric Acid System

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    Chemical waves can be observed during the oxidation of iodide by 3-4.5 M nitric acid. The rate of the wave propagation and the wave shape under convection-free and convective conditions were studied using tub with differentdiametersand atvaryingorientations to thegravitationalvector. Theactivationenergyofthereactiondiffusion front wasdetermined. For the homogeneous reaction, the isothermal density change (ApJ wasmeasured and found to be negative. Because the reaction is exothermic, the Pojman and Epstein analysis of convective stability predicted only simple convection could occur. However, double-diffusive convection and fingering wereobserved. With special convection cells fed through permeable membranes we proved that double-diffusive convection could occur by having two solutal species (iodide and triiodide-starch complex) with significantly different diffusion coefficients and not only from competing thermal and solutal density changes. A mechanism for the angular dependence of the gravitational anisotropy in front velocities is proposed in terms of the Boycott effect

    Into the Lives of Others: Moments of Connection

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    Eldoret: An African Poetics of Technology

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    Top Management Teams and Corporate Citizenship: Re-examining the Place of Worldviews, Governance Conditions, and Incentives

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    The current global economy is increasingly characterized by cultural, political, and religious conflict. International expansion often requires that firms deal with stakeholders from radically different cultures. The top managers of expanding firms must be able to leverage their worldviews to form corporate citizenship investment strategies that will alleviate the concerns held by a growing group of cross-cultural stakeholders. This paper sets forth a conceptual framework that examines how the worldviews of top managers, the governance conditions facing firms, and the incentives which attend various decisions will affect the firm\u27s level of corporate citizenship investment. We build our conceptual framework with a multi-theoretic lens that leverages upper echelons theory, stakeholder theory, and agency theory to inform our understanding of the aforementioned mechanisms. We also discuss the practical implications for managers as well as future research directions that can be gained from a careful consideration of the conceptual framework proposed in this paper
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