EFFECT OF COOLING RATE ON STORAGE LIFE OF PEARS

1965 ◽  
Vol 45 (1) ◽  
pp. 90-97
Author(s):  
S. W. Porritt
Keyword(s):  
Adverse Effects ◽  
Cooling Rate ◽  
Respiration Rate ◽  
Cold Storage ◽  
Storage Life ◽  
Rate Of Cooling ◽  
Increased Susceptibility

A study was made of the effect of rate of cooling after harvest on storage life of Bartlett pears. Delays in placing fruit in cold storage or failure to cool fruit rapidly once in cold storage markedly increased susceptibility to core breakdown, caused accelerated yellowing, and increased respiration rate of fruit in cold storage. These adverse effects of unfavorable cooling procedures were not necessarily accompanied by accelerated softening.

Theoretical Aspccts of Cloud Drop Distributions

1949 ◽  
Vol 2 (3) ◽  
pp. 376 ◽  
Author(s):  
EB Kraus ◽  
B Smith
Keyword(s):  
Cooling Rate ◽  
Drop Size ◽  
Initial Temperature ◽  
Theoretical Study ◽  
Air Pressure ◽  
Size Spectrum ◽  
Condensation Nuclei ◽  
Cloud Drop ◽  
Rate Of Cooling

A theoretical study indicates that the number and size of the drops formed in a cloud vary with the rate of cooling, the initial temperature, and the air pressure. The faster the cooling rate, the lower the initial temperature, and the lower the altitude, the greater is the number of drops and the smaller their size. The drop size spectrum also depends, to a large extent, on the number of available condensation nuclei. Furthermore, it tends to be widened by sedimentation and turbulence.

scholarly journals Estimation of Postharvest Quality of “Red Delicious” Apple Fruits Based on Fruit Nutrient Elements Composition

2016 ◽  
Vol 9 (1) ◽  
pp. 164
Author(s):  
Mahshid Doryanizadeh ◽  
Mahmood Ghasemnezhad ◽  
Atefeh Sabouri
Keyword(s):  
Respiration Rate ◽  
Cold Storage ◽  
Ethylene Production ◽  
Storage Time ◽  
Postharvest Quality ◽  
Mineral Nutrient ◽  
Nutrient Elements ◽  
Total Anthocyanin ◽  
Positive Significant Correlation ◽  
Apple Fruits

<p>Fruit nutrient elements content during harvest could considerably effect on postharvest life of apples. In this study, apple fruits cultivar Red Delicious were harvested at the commercial maturity stage at 20 commercial orchards. Fruits were divided into three groups according to peel color; dark red, medium and light red. The mineral elements nutrient content such as nitrogen, phosphorus, potassium, calcium and magnesium and their ratios were measured in the harvested fruits. Thereafter, fruits were places in the cold storage at 0 °C and relative humidity of 90% for 4 months. The characteristics such as fruits weight loss, firmness, TSS, dry matter, total anthocyanin content, antioxidant activity, respiration rate and ethylene production were measured at the end of storage. The results showed a positive significant correlation between fruit firmness at the end of storage time with N+K:Ca, K+Mg:Ca, K:Ca and Mg:Ca ratios. Furthermore, a negative significant correlation was found between total anthocyanin with Nitrogen content, Mg:Ca and N:Ca ratios. The results also showed a positive significant correlation between fruit respiration rate and Nitrogen, N+K:Ca and N:Ca ratios. The analysis of regression based on mean values of three red apple groups showed a significant negative correlation between total anthocyanin with fruit ethylene production at the storage time and Mg:Ca ratio. The relationship between these two variables and Anthocyanin was expressed by the equation of regression: Anthocyanin = 100.22–1.651 Ethylene–43.963 Mg:Ca. Overall, the results confirm that measurement of fruit mineral composition during harvest time could be a strategy for predicting postharvest behaviors of apple fruits at the cold storage. Also the results showed that a relationship between mineral nutrient composition and the characteristics such as firmness, anthocyanin, respiratory rate in apple fruits.</p>

scholarly journals Edible coatings influence the cold-storage life and quality of ‘Santa Rosa’ plum (Prunus salicina Lindell)

2018 ◽  
Vol 55 (6) ◽  
pp. 2344-2350 ◽  
Author(s):  
Pushpendra Kumar ◽  
Shruti Sethi ◽  
R. R. Sharma ◽  
Manish Srivastav ◽  
Dinesh Singh ◽  
...  
Keyword(s):  
Cold Storage ◽  
Storage Life ◽  
Edible Coatings ◽  
Prunus Salicina

scholarly journals Assessment of the Potential of 1-Methylcyclopropene Treatments to Maintain Fruit Quality of the Common Fig (Ficus carica L. cv. ‘Bursa Siyahi’) during Refrigerated Storage

2014 ◽  
Vol 42 (2) ◽  
pp. 516-522 ◽  
Author(s):  
Okan OZKAYA ◽  
Songül ÇÖMLEKÇIOGLU ◽  
Hatice DEMIRCIOGLU
Keyword(s):  
Respiration Rate ◽  
Cold Storage ◽  
Ficus Carica ◽  
Soluble Solids ◽  
First Year ◽  
Limited Effect ◽  
Growing Seasons ◽  
The Common ◽  
Second Year

The fig fruit is a unique, climacteric, highly perishable subject to rapid physiological breakdown. Application of 1-methylcyclopropene (1-MCP) was tested to delay ripening of black fig (Ficus carica L. cv. ‘Bursa Siyahi’) during storage overtwo growing seasons. Fruits were pre-cooled to 1 °C for 6 hours and afterwards treated with 500 or 1000 nl l-1 of 1-MCP for24 hours. Treated fruits were stored for 10 days at 1 °C, 90-95% RH and then evaluated. 1-MCP treatments showed thatethylene production, respiration rate, weight loss and concentrations of glucose, fructose and total soluble solids (TSS) were negatively correlated to the 1-MCP doses during cold storage (with the exception of TSS in the first year of experiment and respiration rate in the second year of the experiment). In contrast, pulp firmness and colour (ho) during cold storage werepositively correlated to the 1-MCP applied doses. Results of this study showed that although 1-methylcyclopropene applications slowed down fruit softening during the 10 days of storage, 1-methylcyclopropene appeared to have a relatively limited effect on slowing ripening of ‘Bursa Siyahi’ figs.

Postharvest application of salicylic acid reduced decay and enhanced storage life of papaya fruit during cold storage

2020 ◽  
Vol 14 (6) ◽  
pp. 3078-3088 ◽  
Author(s):  
Aliya Hanif ◽  
Saeed Ahmad ◽  
Sana Shahzad ◽  
Mehwish Liaquat ◽  
Raheel Anwar
Keyword(s):  
Salicylic Acid ◽  
Cold Storage ◽  
Storage Life ◽  
Postharvest Application

scholarly journals Fuzzy Control of Cold Storage Refrigeration System with Dynamic Coupling Compensation

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xiliang Ma ◽  
Ruiqing Mao
Keyword(s):  
Adverse Effects ◽  
Fuzzy Control ◽  
Cold Storage ◽  
Control Strategy ◽  
Control Method ◽  
Fuzzy Controller ◽  
Variable Load ◽  
Variable Degree ◽  
Refrigeration System ◽  
Dynamic Coupling

Cold storage refrigeration systems possess the characteristics of multiple input and output and strong coupling, which brings challenges to the optimize control. To reduce the adverse effects of the coupling and improve the overall control performance of cold storage refrigeration systems, a control strategy with dynamic coupling compensation was studied. First, dynamic model of a cold storage refrigeration system was established based on the requirements of the control system. At the same time, the coupling between the components was studied. Second, to reduce the adverse effects of the coupling, a fuzzy controller with dynamic coupling compensation was designed. As for the fuzzy controller, a self-tuning fuzzy controller was served as the primary controller, and an adaptive neural network was adopted to compensate the dynamic coupling. Finally, the proposed control strategy was employed to the cold storage refrigeration system, and simulations were carried out in the condition of start-up, variable load, and variable degree of superheat, respectively. The simulation results verify the effectiveness of the fuzzy control method with dynamic coupling compensation.

scholarly journals Fusarium spp., Cylindrocarpon spp., and Environmental Stress in the Etiology of a Canker Disease of Cold-Stored Fruit and Nut Tree Seedlings in California

Plant Disease ◽  
2013 ◽  
Vol 97 (2) ◽  
pp. 259-270 ◽  
Author(s):  
Stephen M. Marek ◽  
Mohammad A. Yaghmour ◽  
Richard M. Bostock
Keyword(s):  
Cold Storage ◽  
Signs And Symptoms ◽  
Tissue Loss ◽  
Tree Seedlings ◽  
Canker Disease ◽  
Almond Trees ◽  
Asymptomatic Infections ◽  
Canker Development ◽  
Stem Segments ◽  
Increased Susceptibility

The principal objective of this study was to determine the etiology of a canker disease in dormant stone fruit and apple tree seedlings maintained in refrigerated storage that has significantly impacted California fruit and nut tree nurseries. Signs and symptoms of the disease develop during storage or soon after planting, with subsequent decline and death of young trees. Isolations from both diseased and healthy almond and apple trees and Koch's postulates using stem segments of desiccation-stressed almond trees as hosts implicated Fusarium avenaceum and F. acuminatum as the primary causal agents. F. solani, Ilyonectria robusta, and Cylindrocarpon obtusiusculum were also capable of causing similar symptoms but were less frequently encountered in isolations of diseased tissue. Loss of bark turgidity in excised almond stem segments, as can occur in cold-stored seedlings, correlated with increased susceptibility to F. acuminatum, with maximum canker development occurring after relative bark turgidity dropped below a threshold of approximately 86%. Healthy almond trees, almond scion budwood, and a wheat cover crop used in fields where tree seedlings were grown and maintained until cold storage all possessed asymptomatic infections of F. acuminatum, F. avenaceum, and C. obtusiusculum as determined by activation following overnight freezing, cold storage, or desiccation.

Effect of ozone on qualities of fruits and vegetables in cold storage

2001 ◽  
Vol 81 (4) ◽  
pp. 773-778 ◽  
Author(s):  
L. J. Skog, and C. L. Chu
Keyword(s):  
Key Words ◽  
Fruit Quality ◽  
Cold Storage ◽  
Fruits And Vegetables ◽  
Storage Life ◽  
Detectable Level ◽  
Storage Room ◽  
Potential Use ◽  
Ethylene Level

Ozone at the concentration of 0.04 mL L–1 appears to have potential for extending the storage life of broccoli and seedless cucumbers stored at 3°C. Response to ozone was minimal for mushrooms stored at 4°C and cucumbers stored at 10°C. Ozone generators producing 0.04 mL L–1 ozone reduced the ethylene level in vegetable storage rooms from 1.5–2 mL L–1 (as produced by apples placed in the room) to a non-detectable level. At concentrations of 0.4 mL L–1, ozone was effective in removing ethylene from the atmosphere in an apple and pear storage room. The ozonized and non-ozonized apples and pears showed no difference in fruit quality. This study explored a potential use of ozone application in wholesale storage rooms where ethylene-producing and ethylene-sensitive fruits and vegetables may be stored together. Key words: Ozone, ethylene, fruit, vegetable, apple, pear, broccoli, cucumber, mushroom, storage

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