Preventa de eBooks de Biología

Neste livro, o autor apresenta componentes do metabolismo cuja presença no organismo humano é biologicamente importante, mas representa um risco às células. Trata-se do lado oculto do metabolismo hum

Un premio nobel y un astrofísico superventas unen sus fuerzas para descubrir cómo el universo insufló vida a la materia. Durante más de un siglo, los orígenes y la expansión de la vida en la Tierra han permanecido envueltos en un halo de misterio. En Vida y cosmos, Mario Livio y Jack Szostak nos muestran como nuevos descubrimientos y tecnologias estan generando un progreso cientifico inaudito para resolver estas cuestiones. A traves de la vision panoramica que ofrece la astrobiologia, un campo multidisciplinario y vanguardista que fusiona biologia, quimica, astronomia y otras ramas, los autores nos sumergen de una forma fluida y profunda en el conocimiento actual sobre el origen de la vida en la Tierra. Una exploracion decisiva sobre si la vida es un accidente fortuito o un imperativo quimico.

The pinnacle of orchid hunting activity was in the nineteenth century when prices for individual plants reached astonishing levels. Such were the profits to be made that many of the most active orchid hunters were directly employed by orchid nurseries in Britain and Europe. These were not the aristocratic administrators of empire; they were trained gardeners and horticulturalists who had a yearning to travel and see for themselves where the plants they nurtured had come from. In this book we explore the activities of these orchid hunters through the years, from the eighteenth century right into the twenty-first century, when the camera replaced the axe and spade. Many of these stories are rarely told in the context of the society that demanded ever bigger and more flamboyant orchids. Some were collected and the sites they had come from forgotten. Some were so valuable that the sites were kept secret, or misleading information given about their origin, even the wrong country being suggested for some. Orchid hunting was not always safe and some collectors never came home. Of those that did return, contemporary documents suggest that some of the stories they came back with enhanced the value of their plants, but were not always entirely accurate in their details. Using original documents as source material, for the first time tales of orchids lost and found, as well as those that sought them, are told in their entirety.

Among all the varied productions with which Nature has adorned the surfaces of the earth, none awakens our sympathies, or interests our imagination so powerfully as those venerable trees, which seem to have stood the lapse of ages John Muir, 1868A fascinating celebration of the some of the oldest living organisms on the planet, from the grand Oaks of Europe and mighty Redwoods of California to Africas upside-down Baobab tree, and from the Ginkgos of China and Korea to the Olive tree, the worldwide symbol of peace.Ancient Trees covers those species of tree that have lived for more than a thousand years: the Redwood, Bristlecone pine, Montezuma Cypress, the Monkey Puzzle, Amazonian Ancients, Yew, Oak, Sweet Chestnut, Lime, Olive, Welwitschia, the Baobab, Kauri, Totara, Antarctic Beech, the Fig, Cedar, and Ginkgo.Anna Lewington, the well-known writer on all things botanical, and leading wildlife photographer Edward Parker provide an illuminating and visually striking history of each tree species, including where the long-living species can still be found, the trees botanical details, and its mythical associations.

Gods Providential Work in Creation Before Life Began God has been present and active in creation from the moment he created it ex nihilo. Few Christians would question this claim, but its implications for ongoing theology and science dialogues have not been fully explored.In this pathbreaking and field-advancing work, Ross Hastings brings his expertise in both scientific and theological disciplines to bear on the topic of divine providence in chemical evolution. Based on the latest research in the developing field of chemical evolution and the work of theological giants such as Karl Barth, Hastings shows how God may have been providentially and non-competitively at work in the process by which simple prebiotic molecules gave rise to the complex molecules in the first living organisms.In God and Molecules, Hastings provides cutting-edge theological engagement with the developing scientific field of chemical evolution, advances the discussion in theology and science with this new integrative work, and offers a holistic alternative for thinking about chemical evolution that overcomes the binary of theology versus science. God and Molecules pushes toward new frontiers in theology and science and casts a compelling, integrative, and ultimately healing vision for how God has been lovingly involved in the developmental process of the earliest life on earth.