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L’espoir et l’illusion : Actions positives et effets pervers des médias en Afrique subsaharienne

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ISBN: 9782858925599 DOI: 10.4000/books.msha.14405 Language: French
Publisher: Maison des Sciences de l’Homme d’Aquitaine
Subject: Social Sciences
Added to DOAB on : 2019-12-06 13:15:39
License: OpenEdition Licence for Books

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L'Afrique subsaharienne ne présente pas un ensemble homogène, traditions, ancestrales, facteurs historiques et géographiques produisent des physionomies originales. La place prise par les médias est récente et inégale toujours liées à des influences extra-continentales. On ne peut séparer les médias des sociétés dans lesquelles ils fonctionnent : l'observation des médias - surtout de la radio, mieux africanisée - fournit un bon indicateur de l'évolution des sociétés africaines, de leurs espoirs et de leurs illusions. André-Jean Tudesq dresse d'abord un constat des transferts et ruptures que les médias ont apporté aux sociétés africaines. Il les analyse ensuite comme porteurs d'espérance, liées actuellement aux aspirations à mieux vivre, mais aussi avec leurs effets pervers : aggravation de la dépendance au niveau international et des inégalités entre États et au sein des États ; espoir et illusion sont les deux faces contradictoires et néanmoins solidaires des médias. Ils conditionnent les processus d'acculturation (principalement la télévision) et les apports des progrès en matière de santé ou de développement économique. Les médias (surtout la presse écrite) sont au cœur du débat sur la démocratisation en Afrique ; ils sont nécessaires à la transparence des activités publiques et à la dénonciation des injustices mais leur libération (relative selon les États) ne saurait suffire pour assurer le respect des droits de l'homme et l'amélioration du niveau de vie.

Microfluidics for Cells and Other Organisms

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ISBN: 9783039215621 / 9783039215638 Year: Pages: 200 DOI: 10.3390/books978-3-03921-563-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:16
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Microfluidics-based devices play an important role in creating realistic microenvironments in which cell cultures can thrive. They can, for example, be used to monitor drug toxicity and perform medical diagnostics, and be in a static-, perfusion- or droplet-based device. They can also be used to study cell-cell, cell-matrix or cell-surface interactions. Cells can be either single cells, 3D cell cultures or co-cultures. Other organisms could include bacteria, zebra fish embryo, C. elegans, to name a few.

Advancements in Gel Science—A Special Issue in Memory of Toyoichi Tanaka

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ISBN: 9783039213436 / 9783039213443 Year: Pages: 178 DOI: 10.3390/books978-3-03921-344-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Technology
Added to DOAB on : 2019-12-09 11:49:15
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A gel is a state of matter that consists of a three-dimensional cross-linked polymer network and a large amount of solvent. Because of their structural characteristics, gels play important roles in science and technology. The science of gels has attracted much attention since the discovery of the volume phase transition by Professor Toyoichi Tanala at MIT in 1978. MDPI planned to publish a Special Issue in Gels to celebrate the 40th anniversary of this discovery, which received submissions of 13 original papers and one review from various areas of science. We believe that readers will find this Special Issue informative as to the recent advancements of gel research and the broad background of gel science.

Keywords

gel --- thermoresponsive property --- monomer sequence --- co-crosslinking --- copolymerization --- acrylamide derivative --- swelling --- volume phase transition --- agarose gel --- compression --- solvent transport --- sucrose --- xylitol --- volume phase transition --- effects of electric charge --- swelling of thermosensitive gels --- sol-gel transition --- site-bond correlated-percolation model for polymer gelation --- gelation temperature --- cloud point temperature --- spinodal temperature --- spinodal decomposition --- janus particle --- anisotropic shape --- phase separation --- wetting --- micrometric confinement --- micropipette aspiration --- PVA gel --- gamma ray sterilization --- artificial hydrogel cartilage --- frictional property --- wear --- xerogel --- Brunauer-Emmett-Teller theory --- Barrett-Joyner-Halenda analysis --- temperature --- solids content --- drying --- solvent exchange --- microgel --- electrophoresis --- light scattering --- paint coating --- wrinkle --- swelling --- buckling --- Sephadex® (crosslinked dextran) --- crosslink density (density of crosslinks) --- ice grain --- ice crystallization during rewarming --- glassy water --- X-ray CT --- XRD --- poly(vinyl alcohol) --- chemical gel --- microcrystallite --- hydrogen bond --- swelling behavior --- hysteresis --- hydrogel --- friction --- fatigue --- wear --- fracture --- crack --- adhesion --- delamination --- poly (acryl amide) gel --- time domain reflectometry (TDR) of dielectric spectroscopy --- pulse field gradient spin echo method of nuclear magnetic resonance (PFG-NMR) --- scaling analysis --- fractal analysis --- heterogeneous gelation dynamics --- moving boundary picture --- phase transition dynamics --- kinetic coefficient --- blood coagulation --- n/a

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