Jan hellriegel (18 risultati)

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Condizione: Hervorragend. Zustand: Hervorragend | Seiten: 348 | Sprache: Deutsch | Produktart: Bücher | Mit der Digitalisierung der Gesellschaft steigt die Notwendigkeit, Bildungsangebote bereitzustellen, die die Medienkompetenz aller Bürger:innen kontinuierlich verbessern. Doch wer fördert insbesondere die Medienkompetenz von Erwachsenen? Hier sieht Jan Hellriegel die Volkshochschulen (VHS) als öffentlich geförderte Anbieter von Weiterbildung dem Gemeinwohl verpflichtet. Beispielhaft analysiert er die Programme von vier VHS in Rheinland-Pfalz unter dem Aspekt der Medienkompetenzförderung. Ergänzt wird die Fallstudie durch Interviews mit VHS-Leitungen und hauptamtlich pädagogischen Mitarbeitenden. In den Ergebnissen wird deutlich, dass digitale Teilhabe für alle ein bislang nicht erfüllter Bildungsauftrag der VHS ist. "Die Arbeit ist eine Bereicherung für Forschung und Praxis, weil sie eine zentrale gesamtgesellschaftliche Frage adressiert: Welche medienbezogenen Kompetenzen brauchen Bürger:innen in einer digitalen Welt und wie können sie diese erwerben bzw. von wem werden sie dabei unterstützt?"Matthias Rohs, Professor für Erwachsenenbildung an der Technischen Universität Kaiserslautern.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Biofilms play a major role in material cycles and contribute to technical systems significantly. Despite their interference with the functionality of technical equipment or the product quality their ability to catabolize toxins and metabolize pharmaceutically relevant substances increases the interest in biofilm-based biotransformations. However, so far there is a lack of appropriate models that allow anticipating the mechanical stability of biofilms in particular during detachment processes.The main objective of this work was the development of a hydrogel based physico-chemical and growth independent biofilm imitate to investigate mechanical, primarily fluid dynamical stresses and their influence on growth and detachment effects of biofilms. Verification was achieved by comparison with real single culture biofilms. Single culture biofilms of Pseudomonas putida KT2440 were cultivated in a biofilm tube reactor and grown on different surfaces, e.g., tube walls, surface-modified object slides, plastic and iron nettings as well as membrane filters. The establishment of on-line analytics allowed the automatic measurement of dissolved oxygen, pH, temperature and planktonic cell growth by optical density in the cultivation broth. Image acquisition of the biofilm surface supported the observation of biofilm development in terms of growth and detachment.A hydrogel based on gellan was established as simplified artificial biofilm system, which behaves like a viscoelastic fluid. The degree of cross-linking at different gellan levels was modified by the addition of mono-and divalent ions (Na+, Mg2+) and the influence on the material constants in terms of storage (G') and loss (G'') modulus was determined. Experiments and evaluation in the predefined design space were supported by Central Composite Design (CCD), an experimental design technique.The developed gellan-based hydrogel allows mimicking the mechanical properties of a biofilm excluding biological growth effects. It can now be used to validate further characterization methods or to test slowly growing biofilms where systematic errors are often smaller than the biological variances. Eventually this method enables a fast and reliable mechanical testing of biofilm systems. 146 pp. Englisch.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Biofilms play a major role in material cycles and contribute to technical systems significantly. Despite their interference with the functionality of technical equipment or the product quality their ability to catabolize toxins and metabolize pharmaceutically relevant substances increases the interest in biofilm-based biotransformations. However, so far there is a lack of appropriate models that allow anticipating the mechanical stability of biofilms in particular during detachment processes.The main objective of this work was the development of a hydrogel based physico-chemical and growth independent biofilm imitate to investigate mechanical, primarily fluid dynamical stresses and their influence on growth and detachment effects of biofilms. Verification was achieved by comparison with real single culture biofilms. Single culture biofilms of Pseudomonas putida KT2440 were cultivated in a biofilm tube reactor and grown on different surfaces, e.g., tube walls, surface-modified object slides, plastic and iron nettings as well as membrane filters. The establishment of on-line analytics allowed the automatic measurement of dissolved oxygen, pH, temperature and planktonic cell growth by optical density in the cultivation broth. Image acquisition of the biofilm surface supported the observation of biofilm development in terms of growth and detachment.A hydrogel based on gellan was established as simplified artificial biofilm system, which behaves like a viscoelastic fluid. The degree of cross-linking at different gellan levels was modified by the addition of mono-and divalent ions (Na+, Mg2+) and the influence on the material constants in terms of storage (G') and loss (G'') modulus was determined. Experiments and evaluation in the predefined design space were supported by Central Composite Design (CCD), an experimental design technique.The developed gellan-based hydrogel allows mimicking the mechanical properties of a biofilm excluding biological growth effects. It can now be used to validate further characterization methods or to test slowly growing biofilms where systematic errors are often smaller than the biological variances. Eventually this method enables a fast and reliable mechanical testing of biofilm systems.…

Kartoniert / Broschiert. Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. KlappentextrnrnBiofilms play a major role in material cycles and contribute to technical systems significantly. Despite their interference with the functionality of technical equipment or the product quality their ability to catabolize toxins an.…

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Biofilms play a major role in material cycles and contribute to technical systems significantly. Despite their interference with the functionality of technical equipment or the product quality their ability to catabolize toxins and metabolize pharmaceutically relevant substances increases the interest in biofilm-based biotransformations. However, so far there is a lack of appropriate models that allow anticipating the mechanical stability of biofilms in particular during detachment processes.The main objective of this work was the development of a hydrogel based physico-chemical and growth independent biofilm imitate to investigate mechanical, primarily fluid dynamical stresses and their influence on growth and detachment effects of biofilms. Verification was achieved by comparison with real single culture biofilms. Single culture biofilms of Pseudomonas putida KT2440 were cultivated in a biofilm tube reactor and grown on different surfaces, e.g., tube walls, surface-modified object slides, plastic and iron nettings as well as membrane filters. The establishment of on-line analytics allowed the automatic measurement of dissolved oxygen, pH, temperature and planktonic cell growth by optical density in the cultivation broth. Image acquisition of the biofilm surface supported the observation of biofilm development in terms of growth and detachment.A hydrogel based on gellan was established as simplified artificial biofilm system, which behaves like a viscoelastic fluid. The degree of cross-linking at different gellan levels was modified by the addition of mono-and divalent ions (Na+, Mg2+) and the influence on the material constants in terms of storage (G¿) and loss (G¿¿) modulus was determined. Experiments and evaluation in the predefined design space were supported by Central Composite Design (CCD), an experimental design technique.The developed gellan-based hydrogel allows mimicking the mechanical properties of a biofilm excluding biological growth effects. It can now be used to validate further characterization methods or to test slowly growing biofilms where systematic errors are often smaller than the biological variances. Eventually this method enables a fast and reliable mechanical testing of biofilm systems.Cuvillier Verlag, Nonnenstieg 8, 37075 Göttingen 146 pp. Englisch.…

Taschenbuch. Condizione: Neu. Engineering a Biofilm | Imitating Physico-Chemical Properties to Improve Mechanical Characterization | Jan Hellriegel | Taschenbuch | Schriftenreihe des Institutes für Bioverfahrenstechnik der Technischen Universität Braunschweig | 146 S. | Englisch | 2014 | Cuvillier | EAN 9783954047536 | Verantwortliche Person für die EU: BoD - Books on Demand, In de Tarpen 42, 22848 Norderstedt, info[at]bod[dot]de | Anbieter: preigu Print on Demand.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Themenheft 36: Teilhabe in einer durch digitale Medien geprägten Welt - Perspektiven des wissenschaftlichen Nachwuchses. Herausgegeben von Tim Riplinger, Jan Hellriegel und Ricarda Bolten 196 pp. Deutsch.

Buch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Themenheft 36: Teilhabe in einer durch digitale Medien geprägten Welt - Perspektiven des wissenschaftlichen Nachwuchses. Herausgegeben von Tim Riplinger, Jan Hellriegel und Ricarda Bolten.

Buch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Themenheft 36: Teilhabe in einer durch digitale Medien geprägten Welt ¿ Perspektiven des wissenschaftlichen Nachwuchses. Herausgegeben von Tim Riplinger, Jan Hellriegel und Ricarda Bolten 196 pp. Deutsch.

Buch. Condizione: Neu. Teilhabe in einer durch digitale Medien geprägten Welt | Perspektiven des wissenschaftlichen Nachwuchses | Tim Riplinger (u. a.) | Buch | Themenhefte | 196 S. | Deutsch | 2024 | OAPublishing Collective | EAN 9783039780273 | Verantwortliche Person für die EU: BoD - Books on Demand, In de Tarpen 42, 22848 Norderstedt, info[at]bod[dot]de | Anbieter: preigu Print on Demand.…