Libros de ciencias, página 372 de 2843

Estudia, en el marco de la Sociología empírica, el proceso social de la migración española, que desemboca en el retorno de millares de emigrantes. Los datos que se aportan se basan en una amplia encuesta, de ambito nacional, realizada con emigrantes retornados.

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La obra es una invitación para conocer el entorno extremeño de Navalvillar desde su botánica

Os clásicos —da literatura e a ciencia, da pintura, da música...— provocan tan intensa sensación de inexorabilidade, tal certeza de que tarde ou cedo serían escritos, pintados ou compostos, que un mu

Invasive species come in all sizes, from plant pathogens like the chestnut blight in eastern North America, to the red imported fire ant that has spread throughout the South, the predatory Indian mongoose now found in the Caribbean and Hawaii, and the huge Burmese python populating the Florida swamps. And while many invasive species are safe and even beneficial, the more harmful varieties cost the world economy billions of dollars annually, devastate agriculture, spread painful and even lethal diseases, and otherwise diminish our quality of life in myriad surprising ways. In Invasive Species: What Everyone Needs to Know, award-winning biologist Daniel Simberloff offers a wide-ranging and informative survey that sheds light on virtually every aspect of these biological invaders. Filled with case studies of an astonishing array of invasive species, the book covers such topics as how humans introduce these species-sometimes inadvertently, but often deliberately-the areas that have suffered the most biological invasions, the methods we use to keep our borders safe, the policies we currently have in place to manage these species, and future prospects for controlling their spread. An eminent ecologist, Simberloff analyzes the direct and indirect impacts of invasive species on various ecosystems, such as when non-native species out-compete native species for food or light, describes how invasive species (such as the Asian mosquito that is a vector for West Nile virus, itself an invasive species) transmit pathogens, and explains his acclaimed theory of "invasional meltdown" in which two or more introduced species combine to produce a far more devastating impact than any one of them would have caused alone. The book also discusses the more controversial issues surrounding invasive species and it concludes with suggested readings and a list of related web sites.

Con motivo de 130 Aniversario de la botación del submarino, hemos reeditado la obra del autor con información nueva y ampliada. La más documentada y serena biografía de Isaac Peral y de su gran proyecto. En puridad el primer submarino moderno y eficaz de la historia: por primera vez con casco metálico, propulsión eléctrica eficaz, algo muy parecido a un periscopio y tubos lanzatorpedos interiores al casco y probado exhaustivamente con todo éxito en mar abierto. Botado hace ahora 130 años, todo un hito en la olvidada aportación española a la Ciencia y la Técnica. Y también un análisis de la España de la Restauración y de las verdaderas causas que hicieron fracasar el proyecto y la caída en desgracia del gran inventor.

Despite their potentially adverse effects on nontarget species and the environment, insecticides remain a necessity in crop protection as well as in the reduction of insect-borne diseases. The Toxicology and Biochemistry of Insecticides provides essential insecticide knowledge required for the effective management of insect pests. Continuing as the sole book in more than two decades to address this multifaceted field, the Second Edition of this highly praised review on insecticide toxicology has been greatly expanded and updated to present the most current information on:Systemic classification of insecticidesHow insecticides function at the molecular level and newly discovered modes of actionInsecticide resistance, molecular mechanisms, fitness costs, reversion, and management of resistanceVarious bioassay methods including the interpretation of probit analysisMolecular mechanisms of insecticide selectivityMajor biochemical mechanisms involved in the transformation of insecticidesFate of insecticides in the environment and the sublethal effects of insecticides on wildlifeNewly developed insecticides, including the addition of more microbial insecticides in keeping with current integrated pest management (IPM) approachesIncorporating extensive reference lists for further reading, The Toxicology and Biochemistry of Insecticides, Second Edition is an ideal textbook for students of entomology, plant medicine, insecticide toxicology, and related agricultural disciplines. It is also a valuable resource for those involved in insecticide research, environmental toxicology, and crop protection.

Scenarios are an invaluable tool for analyzing complex systems and understanding possible outcomes. This second volume of the MA series explores the implications of four different approaches for managing ecosystem services in the face of growing human demand for them: The Global Orchestration approach, in which we emphasize equity, economic growth, and public goods, reacting to ecosystem problems when they reach critical stages; Order from Strength, which emphasizes security and economic growth; Adapting Mosaic, which emphasizes proactive management of ecosystems, local adaptation, and flexible governance; TechnoGarden, a globalized approach with an emphasis on green technology and a proactive approach to managing ecosystems. The Scenarios volume will help decision-makers and managers identify development paths that better maintain the resilience of ecosystems, and can reduce the risk of damage to human well-being and the environment.

La capacidad de movimiento ha intrigado desde siempre al ser humano, ya sea en referencia a sí mismo a otros animales. Y de los tres grandes tipos de locomoción que normalmente se distinguen (terrestre, acuatica y aerea), el vuelo ha sido, sin lugar a dudas, el mas intrigante. El estudio de la locomocion ha tenido un desarrollo en las ultimas decadas especialmente impactante gracias a las nuevas metodologias electronicas de estudio del movimiento, aunque tambien han contribuido a ello los avances en fisiologia muscular y en el conocimiento de los materiales biologicos. A lo largo de estas paginas veremos las diferentes adaptaciones que han permitido a los animales, en especial a los vertebrados, poder moverse sobre el suelo, en el aire y en el agua. A pesar de las diferencias entre los tres grandes tipos de locomocion, la problematica es parecida: moverse implica un sistema motor que genere fuerza y energia. A partir de ahi el proceso adaptativo, regido por la seleccion natural, tendera a optimizar las soluciones.

The theorems of Berkeley mathematician, Marina Ratner have guided key advances in the understanding of dynamical systems. Unipotent flows are well-behaved dynamical systems, and Ratner has shown that the closure of every orbit for such a flow is of a simple algebraic or geometric form. In "Ratner's Theorems on Unipotent Flows", Dave Witte Morris provides both an elementary introduction to these theorems and an account of the proof of Ratner's measure classification theorem. A collection of lecture notes aimed at graduate students, the first four chapters of "Ratner's Theorems on Unipotent Flows" can be read independently. The first chapter, intended for a fairly general audience, provides an introduction with examples that illustrate the theorems, some of their applications, and the main ideas involved in the proof. In the following chapters, Morris introduces entropy, ergodic theory, and the theory of algebraic groups. The book concludes with a proof of the measure-theoretic version of Ratner's Theorem. With new material that has never before been published in book form, "Ratner's Theorems on Unipotent Flows" helps bring these important theorems to a broader mathematical readership.

"Con más de 350 dinosaurios y animales prehistóricos, esta enciclopedia abarca desde el período Pérmico hasta el Cuaternario. Cada entrada explica la anatomía, tamaño, hábitat, dieta, patrones de cr

Els innumerables paratges recollits fotogràficament en aquest llibre de les Muntanyes de Prades i els boscos de Vimbodí i Poblet ens aproximen a la riquesa micològica de l'entorn, però també a les se

Genomes 4 has been completely revised and updated. It is a thoroughly modern textbook about genomes and how they are investigated. As with Genomes 3, techniques come first, then genome anatomies, followed by genome function, and finally genome evolution. The genomes of all types of organism are covered: viruses, bacteria, fungi, plants, and animals including humans and other hominids. Genome sequencing and assembly methods have been thoroughly revised including a survey of four genome projects: human, Neanderthal, giant panda, and barley. Coverage of genome annotation emphasizes genome-wide RNA mapping, with CRISPR-Cas 9 and GWAS methods of determining gene function covered. The knowledge gained from these techniques forms the basis of the three chapters that describe the three main types of genomes: eukaryotic, prokaryotic (including eukaryotic organelles), and viral (including mobile genetic elements). Coverage of genome expression and replication is truly genomic, concentrating on the genome-wide implications of DNA packaging, epigenome modifications, DNA-binding proteins, non-coding RNAs, regulatory genome sequences, and protein-protein interactions. Also included are applications of transcriptome analysis, metabolomics, and systems biology. The final chapter is on genome evolution, focusing on the evolution of the epigenome, using genomics to study human evolution, and using population genomics to advance plant breeding. Established methods of molecular biology are included if they are still relevant today and there is always an explanation as to why the method is still important. Each chapter has a set of short-answer questions, in-depth problems, and annotated further reading. There is also an extensive glossary. Genomes 4 is the ideal text for upper level courses focused on genomes and genomics.