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The study of adsorbates physical chemistry on crystalline polymer
surfaces is described in this thesis for the first time. In this
work, is presented the interaction of water (adsorbate) with the
ferroelectric surface of the copolymer poly(vinylidene fluoride)
with trifluoroethylene. For more than 20 years adsorbates
interactions have concentrated on the studies of adsorbates on
metal, oxide or semiconducting material surfaces. Advances in
preparing crystalline polymer substrate surfaces, compatible with
ultra high vacuum techniques, makes this current novel effort
possible. Given the increasingly ubiquitous presence of polymers
and their applications in all venues of modern day life, such
studies are essential. This will be among the first serious
fundamental studies of the surface chemistry of a polymer, possible
because of the combination of spectroscopies we can bring to bear
on the problem together with the fact that it can be fabricated
crystalline polymer thin films as substrates for molecular
adsorption studies.
Com prefacio e introducao dos jornalistas Paulo Ferreira e Luis
Rosa, este livro compila as cronicas de Jose Diogo Madeira
publicadas no jornal i, entre 2012 e 2014. O autor questiona dogmas
ideologicos, com uma autonomia e liberdade de pensamento que nao e
catalogavel em nenhuma das tradicionais chaves de classificacao que
opoem a direita a esquerda, a iniciativa individual a
responsabilidade dos agentes publicos, a existencia de um Estado
Social a reforma desse mesmo Estado. E todo o tempo em que alguem
nos obriga a pensar e tempo bem empregue."
El control biologico de acaros y otros artropodos es posible con el
uso de hongos como Hirsutella thompsonii, utilizando conidios
(esporas) y sus metabolitos secundarios. En la actualidad crece el
interes por conocer la relacion patogeno-hospedero y la
reproduccion masiva de estos microorganismos para su utilidad en la
regulacion de las plagas y disminuir el consumo y aplicacion de
productos quimicos tanto en areas agricolas, como en los jardines y
vegetacion circundante de los centros turisticos. El aislamiento,
seleccion y manejo de estos hongos son una alternativa amigable con
el ambiente, que disminuye el impacto por quimicos sinteticos en el
suelo, el agua, el aire y en las personas que son expuestas directa
e indirectamente a estos agentes contaminantes."
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