Bethany Stewart

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T. S. Eliot

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The Waste Land is a long poem by T. S. Eliot. It is widely regarded as one of the most important poems of the 20th century and a central text in Modernist poetry. Published in 1922, the 434-line poem first appeared in the United Kingdom in the October issue of The Criterion and in the United States in the November issue of The Dial. It was published in book form in December 1922. Among its famous phrases are "April is the cruellest month", "I will show you fear in a handful of dust", and the mantra in the Sanskrit language "Shantih shantih shantih". Eliot's poem loosely follows the legend of the Holy Grail and the Fisher King combined with vignettes of contemporary British society. Eliot employs many literary and cultural allusions from the Western canon, Buddhism and the Hindu Upanishads. Because of this, critics and scholars regard the poem as obscure. The poem shifts between voices of satire and prophecy featuring abrupt and unannounced changes of speaker, location, and time and conjuring of a vast and dissonant range of cultures and literatures. The poem's structure is divided into five sections. The first section, The Burial of the Dead, introduces the diverse themes of disillusionment and despair. The second, A Game of Chess, employs vignettes of several characters—alternating narrations—that address those themes experientially. The Fire Sermon, the third section, offers a philosophical meditation in relation to the imagery of death and views of self-denial in juxtaposition influenced by Augustine of Hippo and eastern religions. After a fourth section that includes a brief lyrical petition, the culminating fifth section, What the Thunder Said, concludes with an image of judgment. From Wikipedia (CC BY-SA).

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Biblioteca del Magisterio

REGLAMENTO DE USO Y SERVICIOS DE LA BIBLIOTECA DEL MAGISTERIO

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Poised at the convergence of most catabolic and anabolic pathways, mitochondria are the center of heterotrophic aerobic life, representing a hub in the overall metabolic network of cells. The energetic functions performed by mitochondria face the unavoidable redox hurdle of handling huge amounts of oxygen while keeping its own as well as the cellular redox environment under control. Reactive oxygen species (ROS) are produced in the respiratory chain as a result of the energy supplying function of mitochondria. Originally considered an unavoidable by-product of oxidative phosphorylation, ROS have become crucial signaling molecules when their levels are kept within physiological range. This occurs when their production and scavenging are balanced within mitochondria and cells. Mitochondria-generated hydrogen peroxide can act as a signaling molecule within mitochondria or in the cytoplasm, affecting multiple networks that control, for example, cell cycle, stress response, cell migration and adhesion, energy metabolism, redox balance, cell contraction, and ion channels. However, under pathophysiological conditions, excessive ROS levels can happen due to either overproduction, overwhelming of antioxidant defenses, or both. Under oxidative stress, detrimental effects of ROS include oxidation of protein, lipids, and nucleic acids; mitochondrial depolarization and calcium overload; and cell-wide oscillations mediated by ROS-induced ROS release mechanisms. Mitochondrial dysfunction is central in the pathogenesis of numerous human maladies including cardiomyopathies and neurodegeneration. Diseases characterized by altered nutrient metabolism, such as diabetes and cancer, exhibit elevated ROS levels. These may contribute to pathogenesis by increasing DNA mutation, affecting regulatory signaling and transcription, and promoting inflammation. Under metabolic stress, several ionic channels present in the inner and outer mitochondrial membranes can have pro-life and -death effects. In the present E-book, based on the Frontiers Research Topic entitled: "Mitochondria: Hubs of cellular signaling, energetics and redox balance", we address one of the fundamental questions that the field of ROS biology faces today: how do mitochondria accomplish a reliable energy provision and at the same time keep ROS levels within physiological, non-harming, limits but crucial for cellular signaling function? Additionally, and within the perspective of mitochondria as signaling-energetic hubs in the extensive cellular metabolic network, we ask how can their collective dynamics scale from the subcellular to the cellular, tissue and organ levels to affect function in health and disease.

E. Phillips (Edward Phillips) Oppenheim

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Danielle McGlone

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sameer01

Tops Roofing, a leading roofing contractor in Burlington, Ontario, offers comprehensive roofing services for residential and commercial properties.

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With the right approach and a reputable cheap web designer who understands your reality, a low-cost site can still convert well. Often better than expensive ones weighed down by excess. Simple, clear, and intentional usually wins.

BASHIR AHMAD

Unsilver

Various

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CC BY-ND

This book is a collection of seven essays with an introduction by the editor. The contributions propose first-hand studies of some of the less researched aspects of the history of the Italian communes: the practices of conflict, vendetta and pacification. The variety of different ways of resolving conflicts brought to light by the studies for the various civic and rural contexts (Mantua, Parma, Pisa, Lucca, Florence and the Valdinievole), between the beginning of the thirteenth and the mid fourteenth century, indicate how normal such social relations were, the widespread nature of the feud and the legitimisation and centrality of the culture of the vendetta within the political arena of the commune. The book hence offers a precious contribution for a review of the prevalent narration of the vendetta in late mediaeval Italian society.

Michael Walker

Paul Mahalin

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