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Implementierung von Ruecknahme- und Recyclingsystemen bei Gebrauchsguetern

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Book Series: Schriften zu Marketing und Management ISBN: 9783631337776 Year: Pages: 320 Language: German
Publisher: Peter Lang International Academic Publishing Group
Subject: Environmental Sciences --- Sociology --- Business and Management
Added to DOAB on : 2019-01-15 13:32:40
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Angesichts der Erlassung des Kreislaufwirtschaftsgesetzes und produktbezogener Rücknahmeverordnungen sehen sich Hersteller von langlebigen Gebrauchsgütern gezwungen, Rücknahme- und Recyclingsysteme für Altprodukte zu implementieren. Dabei stehen ihnen verschiedene organisatorische Gestaltungsformen zur Verfügung. Auch bestehen hinsichtlich der Realisation Handlungsoptionen, die mit verschiedenen Auswirkungen verbunden sind. Die Arbeit verfolgt das Ziel, bezüglich dieser Problemstellungen eine wissenschaftlich fundierte Entscheidungsunterstützung zu geben. Dabei wird das Implementierungsverhalten der Hersteller erfaßt und anhand von situativen Kontextfaktoren erklärt. Darüber hinaus werden die Erfolgswirkungen unterschiedlichen Implementierungsverhaltens untersucht, um Implikationen für eine zielführende Vorgehensweise der Implementierung von Rücknahme- und Recyclingsystemen ableiten zu können.

Secretion of Cytokines and Chemokines by Innate Immune Cells

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889195503 Year: Pages: 134 DOI: 10.3389/978-2-88919-550-3 Language: English
Publisher: Frontiers Media SA
Subject: Allergy and Immunology --- Medicine (General)
Added to DOAB on : 2016-01-19 14:05:46
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The release of cytokines, chemokines, and other immune-modulating mediators released from innate immune cells, including eosinophils, neutrophils, macrophages, dendritic cells, mast cells, and epithelial cells, is an important event in immunity. Cytokine synthesis and transportation occurs through the canonical protein trafficking pathway associated with endoplasmic reticulum and Golgi. How cytokines are released upon their exit from the trans-Golgi network varies enormously between cell types, and in many cells this has not yet been characterized. This issue delves into the plethora of cytokines released by innate immune cells, and where possible, shines light on specific mechanisms that regulate trafficking and release of Golgi-derived vesicles. Each cell type also shows varying degrees of dependency on microtubule organization and actin cytoskeleton remodeling for cytokine secretion. Understanding the mechanisms of cytokine secretion will reveal the inner workings of individual innate immune cell types, and allow identification of critical regulatory steps in cytokine release.

Progress in Ecological Stoichiometry

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889456215 Year: Pages: 382 DOI: 10.3389/978-2-88945-621-5 Language: English
Publisher: Frontiers Media SA
Subject: Science (General) --- Microbiology
Added to DOAB on : 2019-01-23 14:53:43
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Ecological stoichiometry concerns the way that the elemental composition of organisms shapes their ecology. It deals with the balance or imbalance of elemental ratios and how that affects organism growth, nutrient cycling, and the interactions with the biotic and abiotic worlds. The elemental composition of organisms is a set of constraints through which all the Earth’s biogeochemical cycles must pass. All organisms consume nutrients and acquire compounds from the environment proportional to their needs. Organismal elemental needs are determined in turn by the energy required to live and grow, the physical and chemical constraints of their environment, and their requirements for relatively large polymeric biomolecules such as RNA, DNA, lipids, and proteins, as well as for structural needs including stems, bones, shells, etc. These materials together constitute most of the biomass of living organisms. Although there may be little variability in elemental ratios of many of these biomolecules, changing the proportions of different biomolecules can have important effects on organismal elemental composition. Consequently, the variation in elemental composition both within and across organisms can be tremendous, which has important implications for Earth’s biogeochemical cycles. It has been over a decade since the publication of Sterner and Elser’s book, Ecological Stoichiometry (2002). In the intervening years, hundreds of papers on stoichiometric topics ranging from evolution and regulation of nutrient content in organisms, to the role of stoichiometry in populations, communities, ecosystems and global biogeochemical dynamics have been published. Here, we present a collection of contributions from the broad scientific community to highlight recent insights in the field of Ecological Stoichiometry.

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