التفاصيل البيبلوغرافية
| العنوان: |
STUDIES IN THE METABOLISM OF APPLES 1. PRELIMINARY INVESTIGATIONS ON INTERNAL GAS COMPOSITION AND ITS RELATION TO CHANGES IN STORED GRANNY SMITH APPLES. |
| المؤلفون: |
Trout, S. A., Hall, E. G., Robertson, R. N., Hackney, Frances M. V., Sykes, S. M. |
| المصدر: |
Australian Journal of Experimental Biology & Medical Science; Sep1942, Vol. 20 Issue 3, p219-231, 13p |
| مستخلص: |
The techniques used for determining the respiration rate and the composition of the internal atmosphere of apples are described and discussed in full. A method is suggested for the quantitative expression of the resistance of the fruit to the passage of carbon dioxide and oxygen. The internal atmospheres of Granny Smith apples were varied artificially by the application of skin coatings. Most of the coatings used in 1940 decreased both the internal oxygen concentration and the respiration rate. There was a highly significant correlation between internal oxygen concentration and respiration rate for coated fruits, but this did not always hold for untreated fruits. The rate of respiration was probably limited by internal oxygen supply. The internal concentration of carbon dioxide did not appear to be increased by coating and was not correlated with the respiration rate in either coated or control fruit. Untreated Granny Smith apples were held at 21.1° C. after various periods of storage at l - l° C. The respiration rate at 21.1° C. decreased with time to a fairly steady value. This decrease in respiration rate was frequently associated with a decrease in the concentration of internal oxygen. The decrease in internal oxygen was probably due to an increase in the resistance of the fruit to gaseous diffusion. The effects of changes in temperature on the respiration rate and the composition of the internal atmosphere were investigated. For temperatures between V C. and 47° C. the internal atmosphere contains more carbon dioxide and less oxygen as the temperature rises. Challenges in the composition of the external atmosphere were reflected by changes in the internal atmosphere. In untreated fruits the rate of colouring was related to the internal oxygen concentration. Treatments generally retarded colouring both at 7.2° C. and 21.1° C. The delay in colouring after treatment may have been due to the reduction of internal oxygen supply. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
