Antiossidanti, pellerossa, bachi da seta: la Maclura Pomifera tra Texas e VenetoPorfirina
Lavoro didattico svolto da Remigio Scandiuzzi e Tiziano Vendrame tra il 2011 e il 2013, presentato alla manifestazione "4 in chimica", il 5 aprile 2013 presso ITIS Fermi di Treviso.
La Maclura Pomifera è un albero originario delle pianure del Texas, che anche nel nome d'uso (Osage Orange) ricorda le tribù indiane che popolavano la sua area di origine.
Diffusa in Italia ed Europa verso la fine del 1800 come sostituto del gelso per l'alimentazione dei bachi da seta, produce dei frutti con un elevato contenuto di particolari antiossidanti, gli isoflavoni, famiglia di sostanze solitamente rare e difficili da reperire.
L'esplosione dell'interesse, sia scientifico che commerciale, verso gli antiossidanti naturali, ha coinvolto anche questa pianta, con un fiorire di studi accademici sui potenziali effetti farmacologici dei due principali componenti, "Osajin" e "Pomiferin", presenti in concentrazioni molto elevate (oltre il 6% sul secco).
La reperibilità dei frutti, la facilità di estrazione e purificazione dei componenti e la loro concentrazione elevata, la rendono interessante dal punto di vista didattico, per esperienze pratiche adatte alle scuole superiori.
Riguardo al tema di composti naturali idonei a dimostrazioni didattiche, la presentazione accenna anche alla necessità che le strutture chimiche dei composti coinvolti siano di una complessità accessibile agli studenti.
Il caso della Maclura è abbastanza inusuale, in quanto combina insieme tutti questi fattori.
Si accenna infine ad alcuni test standard delle capacità antiossidanti, e ad alcuni studi che illustrano il vasto interesse relativo a questi composti.
Antiossidanti, pellerossa, bachi da seta: la Maclura Pomifera tra Texas e VenetoPorfirina
Lavoro didattico svolto da Remigio Scandiuzzi e Tiziano Vendrame tra il 2011 e il 2013, presentato alla manifestazione "4 in chimica", il 5 aprile 2013 presso ITIS Fermi di Treviso.
La Maclura Pomifera è un albero originario delle pianure del Texas, che anche nel nome d'uso (Osage Orange) ricorda le tribù indiane che popolavano la sua area di origine.
Diffusa in Italia ed Europa verso la fine del 1800 come sostituto del gelso per l'alimentazione dei bachi da seta, produce dei frutti con un elevato contenuto di particolari antiossidanti, gli isoflavoni, famiglia di sostanze solitamente rare e difficili da reperire.
L'esplosione dell'interesse, sia scientifico che commerciale, verso gli antiossidanti naturali, ha coinvolto anche questa pianta, con un fiorire di studi accademici sui potenziali effetti farmacologici dei due principali componenti, "Osajin" e "Pomiferin", presenti in concentrazioni molto elevate (oltre il 6% sul secco).
La reperibilità dei frutti, la facilità di estrazione e purificazione dei componenti e la loro concentrazione elevata, la rendono interessante dal punto di vista didattico, per esperienze pratiche adatte alle scuole superiori.
Riguardo al tema di composti naturali idonei a dimostrazioni didattiche, la presentazione accenna anche alla necessità che le strutture chimiche dei composti coinvolti siano di una complessità accessibile agli studenti.
Il caso della Maclura è abbastanza inusuale, in quanto combina insieme tutti questi fattori.
Si accenna infine ad alcuni test standard delle capacità antiossidanti, e ad alcuni studi che illustrano il vasto interesse relativo a questi composti.
Art quilt portfolio by Dena Dale Crain,, including Redefinitions (latest work), Darned Quilts, Finite Designs, Structured Fabrics, Crystal Quilts, Designer Pinwheels. Many pieces silk art quilts.
This work is the output of one textile artist who has worked in many formats, some of which served as the foundation for patchwork quilt design classes taught since 2002 in the USA, Australia, France, England, Kenya, Canada, Kuwait and South Africa, as well as online for Quilt University and QuiltEd Online.
Throughout the works presented here are commonalities of style and presentation leading to a conclusive series of work called “Redefinitions.” This series falls back to the origins of fabric patchwork as it explores the use of freehand and controlled cutting and piecing coupled with accenting linear elements and dense quilting.
Amongst all pieces, two fabrics prevail - silk and cotton - sometimes augmented with synthetic “fancies.” Many fabrics were hand painted, dyed, stamped or stenciled by the artist. Most piecing and quilting was done by machine, although instances of decorative or functionally required hand work can be found. Most beading was done by hand.
Conceptual in theory, these works raise patchwork quilting to the level of fine art.
For more information, contact Dena Dale Crain at http://www.denadalecrain.com.
"SILK" in the Indian subcontinent is a luxury goodPayal Gupta
Silk in the Indian subcontinent is a luxury good. In India, about 97% of the raw silk is produced in the five Indian states of Karnataka, Andhra Pradesh, Tamil Nadu, West Bengal and Jammu and Kashmir.
Matka is an Indian term for rough handloom silk fabric made from very thick yarns spun out of pierced cocoon in the weft and organize in a warp.
Silk is a natural protein fiber, some forms of which can be woven into textiles. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). Silk is produced by several insects, but generally, only the silk of moth caterpillars has been used for textile manufacturing.
Presentation about the environmental and ethical impact of our clothing choices. Presented on 11/13/11 by the Sisters of St. Francis of Clinton, Iowa as part of the Sustainable Clinton series.
For the accompanying notes, send email to:center@clintonfranciscans.com
This presentation looks at the emerging movement to incorporate sustainability into fashion, underscores the challenges the movement is trying to address and the ways in which new startups can move the eco-fashion movement forward.
Art quilt portfolio by Dena Dale Crain,, including Redefinitions (latest work), Darned Quilts, Finite Designs, Structured Fabrics, Crystal Quilts, Designer Pinwheels. Many pieces silk art quilts.
This work is the output of one textile artist who has worked in many formats, some of which served as the foundation for patchwork quilt design classes taught since 2002 in the USA, Australia, France, England, Kenya, Canada, Kuwait and South Africa, as well as online for Quilt University and QuiltEd Online.
Throughout the works presented here are commonalities of style and presentation leading to a conclusive series of work called “Redefinitions.” This series falls back to the origins of fabric patchwork as it explores the use of freehand and controlled cutting and piecing coupled with accenting linear elements and dense quilting.
Amongst all pieces, two fabrics prevail - silk and cotton - sometimes augmented with synthetic “fancies.” Many fabrics were hand painted, dyed, stamped or stenciled by the artist. Most piecing and quilting was done by machine, although instances of decorative or functionally required hand work can be found. Most beading was done by hand.
Conceptual in theory, these works raise patchwork quilting to the level of fine art.
For more information, contact Dena Dale Crain at http://www.denadalecrain.com.
"SILK" in the Indian subcontinent is a luxury goodPayal Gupta
Silk in the Indian subcontinent is a luxury good. In India, about 97% of the raw silk is produced in the five Indian states of Karnataka, Andhra Pradesh, Tamil Nadu, West Bengal and Jammu and Kashmir.
Matka is an Indian term for rough handloom silk fabric made from very thick yarns spun out of pierced cocoon in the weft and organize in a warp.
Silk is a natural protein fiber, some forms of which can be woven into textiles. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). Silk is produced by several insects, but generally, only the silk of moth caterpillars has been used for textile manufacturing.
Presentation about the environmental and ethical impact of our clothing choices. Presented on 11/13/11 by the Sisters of St. Francis of Clinton, Iowa as part of the Sustainable Clinton series.
For the accompanying notes, send email to:center@clintonfranciscans.com
This presentation looks at the emerging movement to incorporate sustainability into fashion, underscores the challenges the movement is trying to address and the ways in which new startups can move the eco-fashion movement forward.
Anna Lucia Alfaro Dardón, Harvard MPA/ID.
Opportunities, constraints and challenges for the development of the small and medium enterprise (SME) sector in Central America, with an analytical study of the SME sector in Nicaragua. - focused on the current supply and demand gap for credit and financial services.
Anna Lucía Alfaro Dardón
Dr. Ivan Alfaro
Entre las novedades introducidas por el Código Aduanero (Ley 22415 y Normas complementarias), quizás la más importante es el articulado referido a la determinación del Valor Imponible de Exportación; es decir la base sobre la que el exportador calcula el pago de los derechos de exportación.
PREVENCION DELITOS RELACIONADOS COM INT.pptxjohnsegura13
Concientizar y sensibilizar a los funcionarios, sobre la importancia de promover la seguridad en sus operaciones de comercio internacional, mediante la unificación de criterios relacionados con la trazabilidad de sus operaciones.
El análisis PESTEL es una herramienta estratégica que examina seis factores clave del entorno externo que podrían afectar a una empresa: políticos, económicos, sociales, tecnológicos, ambientales y legales.
