Moisture diffusivity of table grape stems during low temperature storage conditions

2013 ◽  
Vol 115 (3) ◽  
pp. 346-353 ◽  
Author(s):  
Mduduzi E.K. Ngcobo ◽  
Pankaj B. Pathare ◽  
Mulugeta A. Delele ◽  
Lan Chen ◽  
Umezuruike Linus Opara
Keyword(s):  
Low Temperature ◽  
Moisture Diffusivity ◽  
Storage Conditions ◽  
Table Grape ◽  
Low Temperature Storage ◽  
Temperature Storage

Low-temperature storage of the poultry red mite, Dermanyssus gallinae, facilitates laboratory colony maintenance and population growth

Parasitology ◽  
2020 ◽  
Vol 147 (7) ◽  
pp. 740-746
Author(s):  
Chuanwen Wang ◽  
Xiaolin Xu ◽  
He Yu ◽  
Yu Huang ◽  
Hao Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Survival Rates ◽  
Storage Conditions ◽  
Egg Laying ◽  
Dermanyssus Gallinae ◽  
Control Group ◽  
Poultry Red Mite ◽  
Low Temperature Storage ◽  
Laboratory Colony ◽  
Temperature Storage

AbstractThe poultry red mite, Dermanyssus gallinae, is currently the most common ectoparasite affecting egg-laying hens. Since continuous culture of D. gallinae on birds is a biologically and economically costly endeavour, storage techniques for mites are urgently needed. Effects of temperature on adult and nymph survival were first studied to optimize storage conditions. Then, fecundity of D. gallinae was studied after mites were stored at optimal storage conditions. Results showed the survival rates of protonymphs (42.11%), deutonymphs (8.19%) and females (19.78%) at 5°C after 84 days were higher than those at 0, 25 and 30°C. Thereafter the fecundity and the capability of re-establishing colonies of D. gallinae were evaluated after they were stored for 40 and 80 days at 5°C. After storage, the mean number of eggs showed no statistical difference between treated (5°C for 40 or 80 days) and control groups (25°C for 7 days), while the hatching rates of eggs were in all cases above 97%. The dynamic changes of mite populations and egg numbers showed similar trends to the control group after the stored adult or nymph mites were fed on chicks. Dermanyssus gallinae can be successfully stored at 5°C for 80 days with no interference with the fecundity of mites, and the stored mites could re-establish colonies successfully. Adults and nymphs were two main stages with capability for low temperature storage. These results suggest that low temperature storage is a viable option for colony maintenance of D. gallinae under laboratory conditions.

scholarly journals Optimum Harvest of Low-chill Melting and Non-melting Flesh Peach Cultivars for Direct Ripening and Ripening following Low Temperature Storage

HortScience ◽  
2020 ◽  
Vol 55 (4) ◽  
pp. 487-495
Author(s):  
Ming-Wei S. Kao ◽  
Jeffrey K. Brecht ◽  
Jeffrey G. Williamson
Keyword(s):  
Low Temperature ◽  
Linear Correlation ◽  
Soluble Sugar ◽  
Storage Conditions ◽  
Soluble Solids ◽  
Total Soluble Sugar ◽  
Low Temperature Storage ◽  
Flesh Firmness ◽  
Harvest Maturity ◽  
Temperature Storage

The physical and chemical characteristics of two melting flesh (MF) cultivars, TropicBeauty and Flordaprince, and two non-melting flesh (NMF) cultivars, UFSun and Gulfking, with advancing maturities, were determined at harvest, after ripening at 20 °C for 7 days (i.e., direct ripening) and after storage at 0 °C for 14 days then ripening at 20 °C for 7 days (i.e., ripening following low temperature storage). The NMF cultivars were able to retain flesh firmness better than the MF cultivars as fruit matured and ripened on the tree and after the two storage treatments. The NMF fruit of the least mature to the most advanced maturity groups (MGs) were ≈2 to 7 times firmer than the MF fruit in the same MGs after ripening in both storage conditions. For both MF and NMF fruit, a significant reduction of titratable acidity (TA) occurred with no significant changes in soluble solids content (SSC) and total soluble sugar (TSS) as maturity and ripening progressed on the tree and after ripening in both storage conditions. Minimum quality standards of “ready for consumption” peaches were used as general guidelines to determine the optimum harvest maturity of all four cultivars. The NMF fruit ripened directly had wider optimum harvest maturity ranges and could be harvested at more advanced stages than the MF fruit. The MF fruit that ripened following low temperature storage needed to be picked at earlier maturity stages than those that were directly ripened. The optimum harvest maturity of NMF UFSun for the low temperature storage treatment was more advanced than that of the other three cultivars due to abnormal softening found in the lower MGs after ripening. Linear correlation analyses showed that the skin ground color (GC) a* values of both MF cultivars and NMF ‘UFSun’ were highly correlated with the flesh color (FC) a* values, suggesting that GC a* values can be an informative harvest indicator for this NMF cultivar instead of the traditionally used FC. The GC a* values also had high linear correlation with TA for all four cultivars, suggesting that TA can be a potential maturity index for both MF and NMF peaches. Significant correlations of GC a* values and flesh firmness (GC-FF) were found in all four cultivars in one year but only in MF peaches in both years, showing that flesh firmness was the most consistent maturity indicator for the MF cultivars in this study.

EFFECTS OF PHOSPHATE SPRAYS ON McINTOSH APPLE FRUIT AND LEAF COMPOSITION, FLESH FIRMNESS AND SUSCEPTIBILITY TO LOW-TEMPERATURE DISORDERS

1986 ◽  
Vol 66 (3) ◽  
pp. 617-626 ◽  
Author(s):  
D. H. WEBSTER ◽  
P. D. LIDSTER
Keyword(s):  
Low Temperature ◽  
Storage Temperature ◽  
Ammonium Phosphate ◽  
Storage Conditions ◽  
Apple Fruit ◽  
Fruit Firmness ◽  
Fresh Weight ◽  
Low Temperature Storage ◽  
Leaf Composition ◽  
Temperature Storage

Phosphate compounds (NH4H2PO4, KH2PO4 and CaH4(PO4)2 in 1982; NH4H2PO4 in 1983) applied to McIntosh apple trees as six foliar sprays at weekly intervals starting 4 wk after bloom, increased leaf and fruit P, decreased loss of firmness under some storage conditions and decreased incidence of low-temperature storage disorders. Phosphate sprays improved firmness retention of apples stored in either 5% CO2 plus 3% O2 or 0.7% CO2 plus 1% O2 in 1982 and maintained fruit firmness during a simulated shelf life at 20 °C for apples stored at 0 °C. Firmness retention at 20 °C of the 1983 crop was improved by monobasic ammonium phosphate regardless of storage temperature. Apple samples from unsprayed control trees had mean phosphorus concentrations of 85.4 and 94.4 ppm fresh weight in 1982 and 1983, respectively (whole fruit less seeds and stems).Key words: Apple, fruit phosphorus, low temperature breakdown, core flush

scholarly journals Physico-chemical and enzymatic changes in peach (Prunus persica (L.) Batsch) fruit in response to sodium salts during low temperature storage

2016 ◽  
Vol 8 (4) ◽  
pp. 2116-2119
Author(s):  
S. K. Jawandha ◽  
P. P. S. Gill ◽  
Annu Verma ◽  
Navdeep Kaur
Keyword(s):  
Low Temperature ◽  
Sodium Bicarbonate ◽  
Prunus Persica ◽  
Storage Conditions ◽  
Ambient Conditions ◽  
Post Harvest ◽  
Low Temperature Storage ◽  
Physico Chemical ◽  
Enzymatic Changes ◽  
Temperature Storage

‘Shan-i-Punjab’ is a leading cultivar of peach (Prunus persica (L.) Batsch) in Punjab. After harvesting peach fruits cannot be stored for a longer period under ambient conditions. To prolong the post-harvest life of fruits, an experiment was conducted during the year 2014. Physiological mature fruits of peach cv. Shan-i-Punjab were harvested and subjected to various post-harvest dip treatments viz. sodium bicarbonate (@ 0.5 and 1%), sodium benzoate (@ 0.5 and 1%) for 5 mins. Treated and untreated (control) fruits were packed in Corrugated fibre board CFB boxes and kept under low temperature storage conditions (0-10 C and 90-95% RH) for 6 weeks. Stored fruits were analyzed for various physico-chemical characteristics after 2, 4, 5 and 6 weeks of storage. Fruits treated with 0.5% sodium bicarbonate showed better results in terms low PLW (5.05%), high palatability rating (7.66), TSS (11.26%), acidity (0.70%) and PME activity (1.28 ml of 0.02N NaOH used) upto 4 weeks of storage as compared to control. It can be concluded that peach fruits of the cultivar Shan-i-Punjab treated with sodium bicarbonate @ 0.5% can be safely stored upto 4 weeks with acceptable quality under low temperature conditions.

scholarly journals IMPACT OF HYPOTHERMAL AND LOW TEMPERATURE STORAGE CONDITIONS ON VIABILITY OF IMMOBILIZED PROBIOTICS BIFIDOBACTERIUM BIFIDUM

2020 ◽  
Vol 20 (3) ◽  
pp. 185-191
Author(s):  
G.E. Ananina ◽  
L.V. Stepanyuk ◽  
I.P. Vysekantsev ◽  
I.V. Petrov
Keyword(s):  
Low Temperature ◽  
Storage Temperature ◽  
Storage Conditions ◽  
Bifidobacterium Bifidum ◽  
Morphological Properties ◽  
Bacterial Cells ◽  
Alginate Gel ◽  
Low Temperature Storage ◽  
Gel Particles ◽  
Temperature Storage

Dysbiosis is among the challenges the healthcare is facing now. This condition results from to the combined impact of a number of negative factors on the human body, and immune status weakening. The priority of current biotechnology is the elaboration of probiotics immobilized in gel particles that can be used to correct dysbiosis. Immobilization of probiotic cells in alginate gel granules protects them from the damaging effects of barrier functions of the gastrointestinal tract. The aim of the study was to investigate the effect of hypothermic and low-temperature storage on the viability of the probiotic Bifidobacterium bifidum immobilized in granules of alginate gel. Bacterial cells were immobilized in granules of unmodified gel (1% sodium alginate solution) and in granules of modified sucrose-milk-lactose gel. Granules with immobilized bacterial cells were placed into cryotubes. The samples kept at temperatures of +4, -12, -20, -80 and -196 ° C for 12 months (study period). It was found that storage at temperatures -80 and -196°C provided high viability of the probiotic throughout the study. During storage at temperatures of +4 and -12 ° C, the death of bacteria was observed in 1 – 3 months, depending on the composition of the gel particles, and at a temperature of -20°C the death occurs in 6-9 months. Conclusions: It has been established that the viability of B. bifidum culture cells immobilized in alginate gel granules is influenced by both storage temperature modes and gel modification by the introduction of sucrose-milk-lactose medium. At temperature ragnes of -80 and -196°C, immobilized bacteria do not die during the year (observation period). When storing at the temperatures +4, -12, -20°C, higher viability rates and longer shelf life of bifidobacterial cells were observed in samples of alginate gel granules modified with sucrose-milk-lactose medium. The study has shown that being kept at the low temperature values, B. bifida cells immobilized in unmodified and modified with sucrose-milk-lactose medium do not change their cultural and morphological properties.

Hydration of Cuphea seeds containing crystallised triacylglycerols

2007 ◽  
Vol 34 (4) ◽  
pp. 360 ◽  
Author(s):  
Gayle M. Volk ◽  
Jennifer Crane ◽  
Ann M. Caspersen ◽  
David Kovach ◽  
Candice Gardner ◽  
...  
Keyword(s):  
Low Temperature ◽  
Lipid Body ◽  
Storage Conditions ◽  
Protein Bodies ◽  
Intermediate Type ◽  
Low Temperature Storage ◽  
C Storage ◽  
Visual Damage ◽  
Intermediate Storage ◽  
Temperature Storage

Seeds that exhibit intermediate storage behaviour seem to die under conventional –18°C storage conditions. Cuphea wrightii A. Gray, C. laminuligera Koehne, C. carthagenensis (Jacq.) J.F. Macbr. and C. aequipetala Cav are considered sensitive to low temperature storage. The seeds of these species have triacylglycerols (TAG) that are crystalline at –18°C and melt when the seeds are warmed to >35°C. In contrast, seeds of tolerant species, C. lanceolata W.T. Aiton and C. hookeriana Walp., have TAG that crystallise at temperatures below –18°C and are fluid at 22°C. Cuphea seeds imbided while TAG are crystalline fail to germinate and exhibit visual damage. However, germination proceeded normally when dry seeds were warmed adequately to melt any crystalline TAG before imbibition. Reduced germination and cellular disruption including loss of lipid body compartmentation and fragmented protein bodies develop in seeds with crystalline TAG equilibrated to >0.1 g H2O g–1 DW. This damage cannot be reversed, even when seeds are dried before the damage can be visually detected. Results from this work reveal that the seeds of some species with intermediate type physiologies can be successfully placed into conventional –18 and –80°C storage facilities.

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