Libros de Estudios generales de biología, página 12 de 115

Dentro de la genocinética, ciencia que estudia el movimiento de los genes, la genocinesis es el movimiento de los genes dirigido por tubulinas y otras proteínas formadoras de microtúbulos, filamentos intermedios y microfilamentos, que tiene por causa las ondas y campos electromagneticos. Y aunque el electromagnetismo es imperceptible en nuestra vida cotidiana, y por eso es tan poco intuitivo, contribuira por fin a obtener una teoria que incluya un mecanismo evolutivo que explique todos los fenomenos experimentados en todos los seres vivos y a todos los niveles.Por todo ello, una idea impensable, pero si comprobable mediante experimentacion, nos lleva a descubrir que una ley fisica, fundamento de todo el universo, tambien lo es para la vida en el Ecuador terrestre. El Acelerador Lineal Biologico de Genes mediante Electromagnetismo (ALBGE), causa de la genocinesis.

Esta sexta edición de La Célula mantiene nuestro objetivo principal de ayudar a que los estudiantes comprendan los principios y conceptos de la biología celular contemporánea, al mismo tiempo que conocen la pasion e importancia de la investigacion en este campo de rapida evolucion. Nuestros conocimientos sobre la celula y la biologia molecular han progresado de diferentes maneras en los ultimos cuatro años, y estas mejoras se han incluido en la actual edicion. Algunos de los progresos mas llamativos han surgido gracias a continuos avances en las tecnologias de secuenciacion de alto rendimiento de ADN, lo que ha supuesto adelantos como la nueva consideracion de la funcionalidad de nuestro genoma y de la labor que desempeñan los ARN no codificantes en la regulacion genica. Los avances en tecnologia han permitido la secuenciacion de genomas de muchas y diferentes especies de plantas y animales, al igual que la secuenciacion de genomas humanos individuales, dando lugar a una nueva percepcion de las bases geneticas de las enfermedades. Por ejemplo, la secuenciacion de los genomas celulares del cancer ha permitido que tengamos un amplio conocimiento de las mutaciones que causan el desarrollo de diversos tipos de cancer, facilitando el uso selectivo de medicamentos dirigidos concretamente a combatir las celulas cancerigenas con anomalias geneticas especificas.La investigacion de celulas madre y de la medicina regenerativa es otro de los campos que ha progresado con mayor velocidad. El sorprendente descubrimiento de que las celulas somaticas adultas pueden reprogramarse para funcionar como celulas madre pluripotentes al añadir un pequeño numero de factores de transcripcion, ha abierto el camino a nuevos enfoques de comprension del circuito regulatorio que controla la pluripotencia y la diferenciacion. Se han desarrollado metodos mejorados para inducir celulas madre pluripotentes y estudios sobre la diferenciacion dirigida nos acercan al uso clinico potencial de estas celulas en la terapia de trasplante.

Zoos, aquaria, and wildlife parks are vital centers of animal conservation and management. For nearly fifteen years, these institutions have relied on Wild Mammals in Captivity as the essential reference for their work. Now the book reemerges in a completely updated second edition.Wild Mammals in Captivity presents the most current thinking and practice in the care and management of wild mammals in zoos and other institutions. In one comprehensive volume, the editors have gathered the most current information from studies of animal behavior; advances in captive breeding; research in physiology, genetics, and nutrition; and new thinking in animal management and welfare.In this edition, more than three-quarters of the text is new, and information from more than seventy-five contributors is thoroughly updated. The standard text for all courses in zoo biology, Wild Mammals in Captivity will, in its new incarnation, continue to be used by zoo managers, animal caretakers, researchers, and anyone with an interest in how to manage animals in captive conditions.

Dos de los mecanismos implicados en la diferenciación sexual del cerebro son la apoptosis y la neurogénesis. Ambos procesos son en la actualidad objeto de estudio en numerosas investigaciones en el cerebro adulto y persiguen una misma finalidad: tratar de conocer los procesos por los que el sistema nervioso puede ser reparado en caso de daño. Por una parte, si la apoptosis no se lleva a cabo cuando se debe, el crecimiento indiscriminado de celulas con un ADN defectuoso da lugar a la aparicion de tumores; y por otra, se considera a la neurogenesis adulta como uno de los principales retos de la investigacion actual, porque si conocemos su funcion y ademas la podemos controlar, se tendra una via por la que se puedan reemplazar por neuronas funcionales las neuronas que por cualquier causa degeneren. Todos los descubrimientos realizados en el cerebro adulto sobre estos dos mecanismos han aportado conocimientos fundamentales sobre el desarrollo del sistema nervioso.

Cuestión de sexo. Qué dice la biología acerca de la determinación sexual en humanos. Lección Inaugural del Aula de la Experiencia de la Universidad de Sevilla. Curso Académico 2017-2018

he first synthetic, single-authored overview of the field since Williamson's classic 1996 bookIdentifies current areas of controversy as well as future research directions Carefully balanced to avoid distinct taxonomic, ecosystem, and geographic (both investigator and species) biasesIdeal graduate course material With the exception of climate change, biological invasions have probably received more attention during the past ten years than any other ecological topic. Yet this is the first synthetic, single-authored overview of the field since Williamson's 1996 book. Written fifty years after the publication of Elton's pioneering monograph on the subject, Invasion Biology provides a comprehensive and up-to-date review of the science of biological invasions while also offering new insights and perspectives relating to the processes of introduction, establishment, and spread. The book connects science with application by describing the health, economic, and ecological impacts of invasive species as well as the variety of management strategies developed to mitigate harmful impacts. The author critically evaluates the approaches, findings, and controversies that have characterized invasion biology in recent years, and suggests a variety of future research directions. Carefully balanced to avoid distinct taxonomic, ecosystem, and geographic (both investigator and species) biases, the book addresses a wide range of invasive species (including protists, invertebrates, vertebrates, fungi, and plants) which have been studied in marine, freshwater, and terrestrial environments throughout the world by investigators equally diverse in their origins.This accessible and thought-provoking text will be of particular interest to graduate level students and established researchers in the fields of invasion biology, community ecology, conservation biology, and restoration ecology. It will also be of value and use to land managers, policy makers, and other professionals charged with controlling the negative impacts associated with recently arrived species. Readership: An accessible monograph suitable for graduate level students as well as academic researchers in the fields of invasion biology, community ecology, conservation biology, and restoration ecology. A secondary market will exist amongst land managers, policy makers, and other professionals charged with controlling the negative impacts associated with recently arrived species.About the Author(s)Mark Davis is the DeWitt Wallace Professor and Chair of Biology at Macalester College, Saint Paul, MN, USA, where he has taught since 1981. His teaching and research interests include both plant and animal ecology. For the past twenty years, he has conducted his research at the Cedar Creek LTER site in east-central Minnesota, where his invasion research has focused on the invasibility of grasslands. In particular, he has studied how no-native grasses may influence the ability of woody plants to spread into grassland environments. He is also interested in the history, philosophy, and language of invasion biology, and of science in general.

Este libro involucra experiencias concretas que evidencian, entre otros asuntos, la fertilidad de investigar científicamente y aplicar el conocimiento así construido a problemáticas del ámbito de la neuropsicología, el medioambiente en su relación con el desarrollo humano, el bienestar comunitario, la salud comunitaria y los soportes sociopolíticos que la misma requiere.

Analysts, researchers, and regulators have relied on this peer-reviewed publication since 1905. The trusted source of accurate, proven methodology for analyzing natural waters, water supplies, and wastewaters. The 23rd edition of Standard Methods for the Examination of Water and Wastewaterr contains over 400 laboratory methods for the analysis of Dissolved Solids Metals Free and Total Chlorine Odor, Taste, and Flavor Profile Analysis Disinfection By-products Radionuclides Total Organic Carbon Total and Fecal Coliform Laboratories worldwide rely on this comprehensive reference as the trusted source of accurate, proven methodology for analysis of water, water supplies, and wastewater. It is the essential resource for water analysis professionals. The methods in the 23rd edition (as in previous editions) are believed to be the best available, generally accepted procedures for analyzing water, wastewater, and related materials. They represent the recommendations of specialists, ratified by a large number of analysts and others of more general expertise, and as such are truly consensus standards, offering a valid and recognized basis for control and evaluation. All methods are dated to identify which ones changed significantly between editions. New in the 23rd edition Over 80 revised methods and 5 new methods added Extensive revisions to Microbiological Examination (Part 9000) New drinking water method to test for pharmaceuticals and personal care products New, more realistic, visuals to help identify aquatic organisms Revisions to Solids, Cyanide, Nitrate, Dissolved Oxygen, and Biochemical Oxygen Demand Standard Methods is also offered as a subscription service, which includes all the new, revised, and USEPA-approved methods that are full-text searchable, a discussion group and news about the book, its methods and the oversight board.

Este libro es para la persona que tiene interés en la Ciencia y en nuestra cosmología local. Intenta explicar el presente estado del problema del origen de la vida por las corrientes actuales de pensamiento y conocimiento de la Ciencia. Al hacerlo asi da una vision un tanto parcial pero realista de las diferentes ramas de la Ciencia que cooperan en armonia hacia un logro comun.