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  • Chitosan  (3)
  • Electronics and Electrical Engineering  (2)
  • Surface physics, nanoscale physics, low-dimensional systems  (2)
  • 15-acetylcardiopetamine.  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 25 (1986), S. 1971-1973 
    ISSN: 0031-9422
    Keywords: 13-acetylhetisinone ; 15-acetylcardiopetamine. ; Alkaloids ; C"2"0-diterpenoid alkaloids ; ^1^3C-NMR ; cardiopetamine ; hetisine ; hetisinone
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2012-02-17
    Description: Author(s): R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti Highly spin-selective transport of electrons through a helically shaped electrostatic potential is demonstrated in the frame of a minimal model approach. The effect is significant even for weak spin-orbit coupling. Two main factors determine the selectivity: an unconventional Rashba-like spin-orbit ... [Phys. Rev. B 85, 081404] Published Thu Feb 16, 2012
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
    Publication Date: 2017-05-31
    Description: Author(s): P. Thiessen, E. Díaz, R. A. Römer, and F. Domínguez-Adame We investigate the nonequilibrium transport properties of a disordered molecular nanowire. The nanowire is regarded as a quasi-one-dimensional organic crystal composed of self-assembled molecules. One orbital and a single random energy are assigned to each molecule while the intermolecular coupling … [Phys. Rev. B 95, 195431] Published Tue May 30, 2017
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
    Publication Date: 2018-06-08
    Description: A facility to test the linearity and drift of heterodyne laser metrology gauges for measuring distances of 1 to 7 meters with 10 picometer repeatability is described.
    Keywords: Electronics and Electrical Engineering
    Type: Optoelectronic Distance/Displacement Measurements and Applications; Pavia; Italy
    Format: text
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  • 5
    Publication Date: 2018-06-08
    Keywords: Electronics and Electrical Engineering
    Type: Optoelectronic Distance/Displacement Measurements and Applications; Pavia; Italy
    Format: text
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  • 6
    Publication Date: 2021-05-19
    Description: Se aplicaron coberturas de quitosana en pimientos (Capsicum annuum L.) con el objetivo de evaluar su influen- cia en el mejoramiento de la calidad y prolongación del perío- do de conservación. Cada lote de pimientos fue tratado en forma diferente, considerando muestras sin tratar y tratadas con disoluciones de quitosana. Las coberturas se aplicaron mediante pinceladas con disoluciones a 1 y 2 % (m/v) de quitosana en ácido láctico a 1 %. Posterior al secado de los frutos, estos se envasaron en bolsas de polietileno de baja densidad. Se determinaron varios parámetros de calidad du- rante el almacenamiento de 10 a 12 ºC: pérdida de peso, textu- ra, sólidos solubles, pH y evaluación sensorial mediante el análisis descriptivo cuantitativo. Las coberturas de quitosana mejoraron la calidad de los pimientos con respecto a aque- llos sin tratar y aumentaron su vida poscosecha, obteniéndose mejores resultados con la disolución de quitosana a 1 %.
    Description: Chitosan coatings were applied on green bell peppers (Capsicum annuum L.) to evaluate their effect on prolongation of quality and shelf life of this vegetable. Each group of peppers was treated in different way, considering samples without treatment and samples coated with chitosan solutions. The coatings were applied by brushstrokes with chitosan solutions at 1 and 2% (w/v) in lactic acid 1%. Later to the drying of the vegetables, these they were packed in bags of low density polyethylene. Some parameters of quality were determined during the storage at 10 to 12ºC: weight loss, texture, soluble solids, pH and sensorial evaluation by Quantitative Descriptive Analysis. The chitosan coatings enhanced the quality of peppers and prolonging their shelf life, better results were obtained with chitosan solution at 1%.
    Description: Published
    Description: Capsicum annuum
    Keywords: Green peppers ; Bell peppers ; Chitosan ; Preservation (organisms)
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 7
    Publication Date: 2021-05-19
    Description: Se elaboraron películas a partir de disoluciones a 3 % (m/v) de quitosana en ácido láctico a 1% (v/v), empleando glicerina, sorbitol o polietilenglicol como plastificante en concentraciones de 0,25 a 0,50 mL/g de quitosana. Se midieron el esfuerzo tensil, elongación, fuerza de ruptura, deformación y el espesor de las películas, con el objetivo de evaluar la influencia de la masa molar y concentración de plastificante sobre sus propiedades mecánicas. Se obtuvieron los modelos matemáticos que relacionan estos factores. Las películas con polietilenglicol, presentaron mayor esfuerzo tensil y fuerza de ruptura normalizada que las plastificadas con glicerina o sorbitol, pero resultaron menos elásticas y deformables, además, mientras mayor fue la concentración de plastificante, más elásticas resultaron las películas y menor fue el esfuerzo necesario para su rup- tura.
    Description: Films were obtained preparing 3% (w/v) chitosan solutions in 1% (v/v) lactic acid using glycerol, sorbitol or polyethylene glycol at 0.25 to 0.50 mL/g of polymer as plasticizers. Film thickness, tensile strength, force at break, deformation and elongation were measured in order to evaluate the effect of molar mass and plasticizers concentration on mechanical properties values. Mathematical models with these factors were proposed. Films with polyethylene glycol had higher tensile strength and normalized force at break than those which glycerol or sorbitol, but less elongation or normalized deformation. In addition, the films were more elastic and with lesser force at break with the increase of plasticizer concentration.
    Description: Published
    Description: plasticizer
    Description: edible film
    Keywords: Chitosan ; Biopolymers ; Elasticity ; Mechanical properties
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 8
    Publication Date: 2021-05-19
    Description: El objetivo del estudio fue evaluar la influencia de coberturas de quitosana en lascas de jamón cocido y jamón Visking envasadas al vacío. En ambos productos se observó un incremento de la acidez, mayor en los productos con coberturas de quitosana. Se produjo un aumento de la dureza con el tiempo, sin que existieran diferencias significativas (p≤0,05) atribuibles a la aplicación de coberturas. Se encontró un efecto favorable de las coberturas de quitosana en cuanto a retardar el desarrollo de los psicrófilos. La calidad sensorial fue el parámetro que más se afectó durante el almacenamiento; en el jamón cocido el sabor se tornó ácido y se observó un exudado lechoso y en el jamón Visking los jueces refirieron olores y sabores atípicos y una disminución moderada del sabor típico.
    Description: The aim of the study was to evaluate the influence of chitosan films in two vacuum packaged pork sausages. In both products an increment of the acidity was observed, higher in the products with chitosan coatings. An increase of the hardness took place the time, without significant differences existed (p≤0,05) attributable to the application of coatings. It was a favorable effect of the chitosan coatings as for slowing the development of the psicrophilic microorganisms. The sensorial quality was the most affected parameter during the storage
    Description: Published
    Description: vauum
    Keywords: Sausages ; Hams ; Chitosan ; Wrapping ; Conservation ; Cold storage ; Packaging materials
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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