Elmarco (Czechia)

Durante el mes de octubre de 2014 se llevaron a cabo en la ciudad de General Roca provinciade Río Negro, Argentina, las XI Jornadas Nacionales y VI Congreso Internacional de Enseñanza de laBiología, bajo el lema “Afianzando el vínculo entre la formación del profesorado, la investigación endidáctica de las ciencias y la innovación en las aulas”. Organizadas por la Asociación de Docentes enCiencias Biológicas de la Argentina (ADBiA) y la Universidad Nacional de Río Negro (UNRN).Como en encuentros anteriores organizados por ADBiA, se propuso un espacio para la reflexión,el análisis y el debate en torno a las temáticas del campo de la educación científica, como asítambién para la exposición de alternativas innovadoras e investigaciones educativas, privilegiando eltratamiento de temas con un enfoque regional. Las Jornadas y Congresos constituyen para ADBiA unode sus ámbitos de acercamiento más destacados. Se concretan en forma bianual convocando a socios,no socios, alumnos e investigadores del área de Ciencias Naturales y en particular de la Biología.

Electrospun gelatin and poly-ε-caprolactone (PCL) nanofibers were prepared using needleless technology and their biocompatibility and therapeutic efficacy have been characterized in vitro in cell cultures and in an experimental model of a skin wound. Human dermal fibroblasts, keratinocytes and mesenchymal stem cells seeded on the nanofibers revealed that both nanofibers promoted cell adhesion and proliferation. The effect of nanofibers on wound healing was examined using a full thickness wound model in rats and compared with a standard control treatment with gauze. Significantly faster wound closure was found with gelatin after 5 and 10 days of treatment, but no enhancement with PCL nanofibers was observed. Histological analysis revealed enhanced epithelialisation, increased depth of granulation tissue and increased density of myofibroblasts in the wound area with gelatin nanofibers. The results show that gelatin nanofibers produced by needleless technology accelerate wound healing and may be suitable as a scaffold for cell transfer and skin regeneration.

Polyurethane (PUR) nanofabrics based on nanofibers of average diameters in the range of 250-110 nm with different meso-tetraphenylporphyrin (TPP) loading (0.01-5 wt %) were prepared by an electrospinning process. The oxygen quenching of excited states and singlet oxygen-sensitized delayed fluorescence (SODF) of TPP were studied at different oxygen pressures. We found that TPP in PUR matrix is present in monomeric state, and it is easily accessed by oxygen. Analysis of the kinetics of the TPP triplet, singlet oxygen, and SODF indicates that repopulation of TPP fluorescent state includes reaction of singlet oxygen with TPP triplets. The integrated SODF achieved more than 20% of the prompt fluorescence for nanofabric loaded with 5 wt % TPP. The dependence of SODF intensity on the TPP concentration in nanofibers is nearly quadratic.

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Abstract The theoretical background and technical capabilities of the free liquid surface (nozzle-less) electrospinnig process is described. The process is the basis of both laboratory and industrial production machines known as NanospiderTM and developed by Elmarco s.r.o. Technical capabilities of the machines (productivity, nanofiber layer metrics, and quality) are described in detail. Comparison with competing/complementary technologies is given, e.g. nozzle electrospinning, nano-meltblown, and islets-in-the sea. Application fields for nanofiber materials produced by various methods are discussed. Consistency of the technology performance and production capabilities are demonstrated using an example of polyamide nanofiber air filter media.