115 research outputs found

    Bleeding through… compositional processes in the integration of Middle Eastern and Western art music

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    This thesis consists of a portfolio of 10 compositions accompanied by a written commentary with audio and video recordings of my works. These compositions span a wide variety of instrumentations from large orchestral works to solo instrumental works, of both Western and Eastern traditions, as well as vocal and live art installation pieces. Throughout the commentary I explore the continuum of how Eastern traditional idioms and Western art music play a role in the creation of my musical language. This includes an overview of the history of bi-cultural integration and an exploration of the motivations for integrating musics, both in my own work and that of other composers. I explore particular parameters within my works, focusing on the spectrums between composition and improvisation, the concepts of translation and transcription and collaborative practice with Western classical and musicians of Eastern traditional music. Additionally, I examine how my application of Eastern musical parameters and techniques are filtered through four of my other interests and influences: namely, my development of a gestural and timbral language which stems from an engagement with my approach to pitch and harmony

    Phased Fiber Growth in a Peptide Conjugate:  Aggregation and Disaggregation Studies

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    A glycine-rich, short pentapeptide conjugate 6, derived from the highly conserved copper-binding octarepeat region of the prion protein, exhibits a tendency to self-aggregate in a time-dependent fashion. Aging of 6 afforded an insight into the phased growth of spherical prefibrillar structures to fibers of long persistence length, as observed by a combination of microscopic techniques. Interestingly, growth of these fibers was inhibited by colchicine, a known inhibitor of microtubule polymerization in a concentration dependent fashion. This study offers an intriguing insight into the occurrence of prefibrillar intermediates on the path to the formation of full length peptide fibers. It is also envisaged that constructs such as 6 may also serve as simple models to study chemical intervention of protein aggregation

    Energy Efficient Zone Divided and Energy Balanced Clustering Routing Protocol (EEZECR) in Wireless Sensor Network

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    Wireless sensor network has proven its significance in almost every field in today’s era. Wireless sensor network consists of large number of sensor nodes distributed randomly in some areas. In WSN the main objective has been increasing the network lifetime. There is zone divisional approach which has shown sound improvement in increasing the network lifetime over the Leach and EEUC protocols. The proposed protocol Energy efficient zone divided and energy balanced clustering routing protocol (EEZECR) has not only much higher network lifetime as compare to ZECR and it also has much better load balancing in the network. In the EEZECR the concept of double cluster head in a cluster is introduced which reduces the load on cluster head and very efficiently does the task of load balancing in the network thoroughly whichmakes this protocol favorite for many real time applications. Simulations are performed in MATLAB.</div

    Silver−Adenine Metallamacrocyclic Hexamer

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    Beneficial carboxylate−silver interactions afford facile coordination of five silver ions to a modified adenine ligand, leading to the formation of a hexameric cyclic structure in the solid state

    Silver−Adenine Metallamacrocyclic Hexamer

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    Beneficial carboxylate−silver interactions afford facile coordination of five silver ions to a modified adenine ligand, leading to the formation of a hexameric cyclic structure in the solid state

    Crystal Engineering with 2‑Aminopurine and 2,6-Diaminopurine Derivatives: Dimers, Metallaquartets, and Halide-Bridged Clusters

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    Design, synthesis, and single crystal structure elucidation of modified purine ligands 2-(2-amino-9<i>H</i>-purin-9-yl) acetic acid (<b>L1</b>) and 2-(2,6-diamino-9<i>H</i>-purin-9-yl) acetic acid (<b>L2</b>) and their interaction with certain d<sup>10</sup> transition metal ions is described. Copper complex <b>1 </b>(C<sub>28</sub>H<sub>34</sub>Cu<sub>2</sub>N<sub>22</sub>O<sub>19</sub>) afforded a two-dimensional polymeric structure composed of metallaquartets, while corresponding silver complex <b>2 </b>(C<sub>14</sub>H<sub>20</sub>AgN<sub>10</sub>O<sub>8</sub>) was formed as a discrete dimer. Complexes <b>3 </b>(C<sub>14</sub>H<sub>24</sub>CdN<sub>10</sub>O<sub>10</sub>) and <b>5 </b>(C<sub>14</sub>H<sub>22</sub>CdN<sub>12</sub>O<sub>8</sub>), cadmium complexes of <b>L1</b> and <b>L2</b>, respectively, afforded different coordinating modes, where <b>3</b> resulted in a two-dimensional (2D) polymeric structure consisting of metallaquartets and <b>5</b> as a discrete dimeric structure, with an octahedral coordination geometry. Complex <b>4 (</b>C<sub>14</sub>H<sub>13</sub>Cl<sub>13</sub>Hg<sub>6</sub>N<sub>10</sub>O<sub>8</sub>) afforded a unique hexanuclear, 2D polymeric structure, supported by mercury-chloride bridges, presenting as interconnected dimeric, trimeric, and hexameric mercury halide (μ<sub>2double</sub>, μ<sub>3triple</sub>, and μ<sub>6six</sub>) clusters. The potential of halide ions as bridges is interesting. We have also studied the fluorescence properties of ligand <b>L1</b> and <b>L2</b> along with complexes <b>1</b>–<b>5</b>

    Crystallographic Signatures of <i>N</i><sup>6</sup>-Methoxyadenine Imino Tautomer–Silver Complexes

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    Detailed crystallographic analysis of four silver complexes of <i>N</i>9-benzyl-<i>N</i><sup>6</sup>-methoxyadenine, <b>1</b>, on the basis of three different counteranions and silver ion stoichiometry, is discussed in this article. <b>1</b> is a rare tautomer of adenine, which exhibits promutagenic behavior as it partly mimics hydrogen bond donor and acceptor properties of guanine and mispairs with cytosine. Complexes <b>2</b> and <b>4</b> exhibit discrete Ag<sub>2</sub>L<sub>2</sub> dimer, while complex <b>3</b> shows two AgL<sub>2</sub> units in addition to a Ag<sub>2</sub>L<sub>2</sub> dimer, all in a head-to tail fashion. Complex <b>5</b>, on the other hand, shows four AgL<sub>2</sub> units coordinated in a head-to-head fashion affording a three-dimensional lattice stabilized by CH···F interactions. Various noncovalent interactions such as hydrogen bonding, CH-π interactions, argentophilic interactions, and Ag-π interactions stabilize these complexes

    Interconnected Trimeric, Pentameric, and Hexameric Metallacycles in a Singular Silver−Adenine Framework

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    This Article describes the synthesis and crystallographic investigation of a silver complex of a modified adenine derivative bearing a nitrile pendant at the N9 position. All three adenine ring nitrogen atoms coordinated to silver ions, while the fourth coordination was achieved at the nitrile functionality, thus resulting in the formation of silver-mediated interconnected trimeric, pentameric, and hexameric metallacyclic rings and helical signatures in two orthogonal directions

    Patterned Deposition of a Mixed-Coordination Adenine−Silver Helicate, Containing a π-Stacked Metallacycle, on a Graphite Surface

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    A novel mixed-valence silver complex with modified adenine and its adsorption behavior on different substrates was studied by atomic force microscopy, and selective patterning on a graphite surface is described in this report

    A Luminescent Silver−Adenine Metallamacrocyclic Quartet

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    This communication describes formation of a 3N-coordinated silver-modified adenine metallamacrocyclic quartet in solid state, its aggregative ordering on graphite surface, and luminescence
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