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  • BIOTECHNOLOGY  (3)
  • Chitosan  (3)
  • Chemistry  (2)
  • Electronics and Electrical Engineering  (2)
  • 13-acetylhetisinone  (1)
  • 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
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 639-640 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Flame ionization detector, FID ; Electron capture detector, ECD ; Effluent splitting ; Pesticides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 147-155 
    ISSN: 1057-9257
    Keywords: synthesization ; chalcopyrite ; CuGaSE2 single phase ; X-ray diffraction ; stoichiometric deviations ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The dependence of the structural parameters on compositional deviations of CuGaSe2 has been studied. These deviations have been induced along an ingot by a single fusion of the components at 1150 °C and subsequent slow cooling in a stationary ampoule in a vertical furnace. All along the sample a single chalcopyrite phase is present and a compositional gradient along the ingot was found by energy-dispersive analysis of X-rays (EDAX) measurements, the upper part being rich in Ga (series B) and the lower part in Cu (series A), with Cu/Ga ratios of 0·95 and 1·1 respectively. A hypothesis of the existence of two phases in the melt is proposed to explain these facts. The unit cell parameters, anion displacement and Cu and Ga occupation numbers in their sublattices were analysed by X-ray powder diffraction and Rietveld refinement methods. In series A the occupation numbers are near stoichiometry, while in series B a Cu defect appears. In both series, changes in unit cell parameter are related to changes in Cu content, suggesting the presence of a fraction of Cu ions either as interstitials or at Ga sites when Cu is in excess, or of Cu vacancies in its sublattice when there is a Cu deficiency. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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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: 2019-06-27
    Description: Thermal balance between heat removal and metabolic rate in pressurized Gemini G2-C full pressure suit at two barometric pressures
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-81183 , LS-140
    Format: application/pdf
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  • 7
    Publication Date: 2019-06-27
    Description: Heat balance and ventilation of human body in pressure suit
    Keywords: BIOTECHNOLOGY
    Type: AEROSPACE MEDICINE
    Format: text
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  • 8
    Publication Date: 2019-07-13
    Description: Analytical model for frog retinal bug detector cell to make possible signal measurement in frog optic fibers
    Keywords: BIOTECHNOLOGY
    Type: CYBERNETIC PROBLEMS IN BIONICS; May 03, 1966 - May 05, 1966; DAYTON, OHIO
    Format: text
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  • 9
    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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  • 10
    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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