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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 32 (1967), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: SUMMARY— Firmness in fruits is sometimes evaluated as being the force necessary to attain a given deformation within the product. Since modulus of elasticity is defined as the ratio of stress to strain, it should measure resistance to force and, hence, the firmness of a material. Using a sonic technique, the resonant frequencies of cylindrical specimens of flesh from Valery bananas were measured and Young's modulus of elasticity was calculated. Softening of the banana during ripening was associated with a decrease in Young's modulus of elasticity from 272 × 105 dynes/cm2 at ripeness corresponding to a light green peel color to 85 × 105 dynes/cm2 at the yellow stage. Modulus of elasticity was significantly and directly correlated with starch content, but inversely correlated with luminous reflectance and the logarithm of percent reducing sugars.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 36 (1971), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: SUMMARY– Sonic and ultrasonic measurements were made on bovine bone to explore their possible value in objectively determining chronological age of a beef animal carcass. The sonic resonant frequency of the bone and the transmission rate of an ultrasonic pulse through the bone were measured on the right large metacarpal bone of slaughtered beef animals of different ages of the same breed. Thirty-four bones from animals approximately 6, 12, 18, 24, and 30 months of age were measured. The simple correlation coefficient between animal age and the sonic resonance parameter, (FLP was 0.875 and between age and the ultrasonic velocity parameter, (cm/μsec)2 was 0.866.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Research was undertaken to establish relationships between volatile levels in the juice of fresh apples, determined by GLC headspace vapor analysis, and other objective indices of maturity and ripeness. Mclntosh apples were tested individually after harvest or following storage and ripening. Volatile levels in the juice were correlated with titratable acidity, Magness-Taylor firmness and stiffness coefficient values. The stiffness coefficient is derived from nondestructive sonic resonance frequency measurements and has potential value for sorting.
    Type of Medium: Electronic Resource
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