scholarly journals Primary Bud Hardiness of Four Genotypes of Grapes in Arkansas

1991 ◽  
Vol 116 (5) ◽  
pp. 835-837 ◽  
Author(s):  
Timothy F. Bourne ◽  
J.N. Moore ◽  
Milon F. George
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Cold Hardiness ◽  
Training System ◽  
The Other ◽  
Training Systems ◽  
Freeze Damage ◽  
Vitis Spp

Four interspecific grape hybrids (Vitis spp.) developed in Arkansas were evaluated for primary bud hardiness by differential thermal analysis. Buds from two locations were analyzed over 2 years for acclimation, midwinter hardiness, and deacclimation. In addition, effects of two training systems on cold hardiness of buds were evaluated in one location. The buds of the two genotypes with the greatest component of V. vinifera in their ancestry acclimated more slowly than did the other genotypes. Ultimate midwinter bud hardiness was greater in the genotypes possessing less V. vinifera than other parentage. No effect on cold hardiness due to training system was noted. No natural winter freeze damage was observed on any of the genotypes in the period of observation.

scholarly journals PECAN COLD HARDINESS DETERMINED BY DIFFERENTIAL THERMAL ANALYSIS

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 437e-437
Author(s):  
Frank B. Matta ◽  
Amin Kawatin
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Electrolyte Leakage ◽  
Cold Hardiness ◽  
The Other ◽  
Critical Temperatures ◽  
Leakage Test ◽  
Tetrazolium Test ◽  
Tissue Browning

Stem critical temperatures for September showed that `Hughes' was later in acclimating than `Jackson'. Maximum hardiness for all cultivars occurred in January and deacclimation in February. Bud critical temperatures for September and October also showed that `Hughes' acclimated later than the other cultivars. Maximum hardiness for buds occurred in January and deacclimation in March. In December, the LT50 for the tetrazolium test, the electrolyte leakage test, and the tissue browning test were –18, –20, and –20C, respectively, as shown by differential thermal analysis of `Desirable'.

scholarly journals 564 PB 415 A COMPARISON OF COLD HARDINESS AMONG LAGERSTROEMIA INDICA × FAURIEI CULTIVARS GROWN IN ZONES 7 AND 8 USING DIFFERENTIAL THERMAL ANALYSIS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 512d-512
Author(s):  
April D. Edwards ◽  
Steven E. Newman ◽  
Frank B. Matta ◽  
Adolph J. Laiche
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Cold Hardiness ◽  
Freezing Point ◽  
Freeze Damage

During recent freezes in the mid-south, crape myrtles have suffered severe freeze damage. Some increased levels of cold hardiness have been observed in the National Arboretum crape myrtle releases, but the degree of tolerance has not been documented. The relative cold hardiness of five hybrid crape myrtle cultivars `Muskogee', `Natchez', `Osage', `Tuskegee' and `Yuma' was determined using differential thermal analysis. Stem samples were collected from established trees at two locations, Poplarville, Zone 8 and Starkville, Zone 7 once per month from October through April. Freezing point suppression was determined from five samples from each cultivar and location. Observed exotherms ranged from -7C to -13C.

Preparation of Glass-Ceramics Using Molybdenum Tailings

2011 ◽  
Vol 284-286 ◽  
pp. 1431-1434 ◽  
Author(s):  
Jin Rui Zhang ◽  
Ru Wang
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Crystalline Phase ◽  
Glass Ceramics ◽  
Chemical Properties ◽  
The Other ◽  
Raw Material ◽  
Physical Chemical ◽  
Nucleation Agents

In order to utilization the molybdenum tailings which be deposited in large quantities. Test used it to prepare glass-ceramics as main raw material, TiO2 as nucleation agents and CaO-Al2O3-SiO2 system and wollastonite as the principal crystalline phase. Heat treatment system of glass-ceramics was based on the differential thermal analysis. The crystalline phase, microstructure and characteristics of glass-ceramics were analysis by XRD, SEM and physical, chemical properties test. The result shows that the performance of glass-ceramics was superior to the other types of building decoration stone.

Phase studies on the iron–selenium system

1968 ◽  
Vol 46 (8) ◽  
pp. 1171-1174 ◽  
Author(s):  
J. E. Dutrizac ◽  
M. B. I. Janjua ◽  
J. M. Toguri
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
The Other ◽  
Sampling Techniques ◽  
Liquid Region ◽  
Consolute Temperature ◽  
Liquid Sampling

The quasi-reduced iron–selenium phase diagram has been determined by a combination of differential thermal analysis, visual polythermal, and liquid sampling techniques. Iron and selenium form two compounds: FeSe2 with a broad stoichiometry range and FeSe2 with a much narrower composition field. The former compound was found to melt congruently at 1070 °C and 53.5 atomic % selenium, while the latter melted incongruently at 585 °C. Two liquid–liquid regions were observed in this system. One occurred above 790 °C from 73.9 atomic % selenium to about 99.92% selenium with a consolute temperature of 1070 °C at approximately 93 atomic % selenium. The other liquid–liquid region extends upwards from 1520 °C and lies between 3 and 39.5 atomic % selenium.

scholarly journals 329 DIFFERENTIAL THERMAL ANALYSIS OF RABBITEYE BLUEBERRIES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 477f-477
Author(s):  
Gena R. Hughes ◽  
Frank B. Matta
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Low Temperature ◽  
Cold Hardiness ◽  
Vaccinium Ashei ◽  
Tissue Browning

Acclimation and cold hardiness of blueberry buds (Vaccinium ashei cv. Tifblue) were evaluated using differential thermal analysis (DTA) and tissue browning. Buds exhibited a single exotherm at -7C October through December and at -11C January through April. LOW temperature exotherms (LTE) were not detected. Tissue browning test ratings indicated that ovary death occurred at -21C.

scholarly journals COLD HARDINESS OF PASSION FRUIT AND MAYPOP

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 655f-655
Author(s):  
Frank B. Matta ◽  
Patricia Quesada
Keyword(s):  
Thermal Analysis ◽  
Tissue Culture ◽  
Differential Thermal Analysis ◽  
Electrolyte Leakage ◽  
Cold Hardiness ◽  
Callus Formation ◽  
Passion Fruit ◽  
Lethal Temperatures ◽  
Purple Passion Fruit ◽  
Yellow Passion Fruit

Differential thermal analysis, electrolyte leakage, tetrazolium stain test, and the “feeder plate” tissue culture regeneration technique were used to determine cold hardiness of passion fruit and maypop. The “feeder plate” technique showed that yellow passion fruit did not regenerate at 0C, -3C, and -6C while purple passion fruit showed callus formation at all temperatures. The remaining tests gave similar lethal temperatures for the two species. Lethal temperatures were -9C to -10C, -10C to -I2C, and -11C to -13C for yellow and purple passion fruit and maypop, respectively.

scholarly journals Differential thermal analysis of Kharidhunga magnesite

1991 ◽  
Vol 7 ◽  
Author(s):  
Vishnu Dangol
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Analysis ◽  
The Other ◽  
Sharp Rise ◽  
Magnesite Deposit ◽  
Dta And Tg ◽  
Dta Curves ◽  
Representative Samples

The DTA curves of seven representative samples from the Kharidhunga Magnesite Deposit arc asymmetric and show a sharp rise after attaining the maxima between 670 and 700 oC, which indicates the siliceous nature of the magnesite. The overlapped endothermic peaks al 770 oC and 860 oC characterize the presence of calcite and dolomite respectively as the other impurities. The results of DTA and TG are also compared with the available data of chemical analysis.

scholarly journals Standardization of electrolyte leakage data and a novel liquid nitrogen control improve measurements of cold hardiness in woody tissue

2021 ◽  
Author(s):  
Alisson Pacheco Kovaleski ◽  
Jake J Grossman
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Liquid Nitrogen ◽  
Plant Tissue ◽  
Electrolyte Leakage ◽  
Cold Hardiness ◽  
Nitrogen Control ◽  
Freezing Damage ◽  
Raw Data ◽  
Reliable Determination

Abstract Background. A variety of basic and applied research programs in plant biology require the accurate and reliable determination of plant tissue cold hardiness. Over the past 50 years, the electrolyte leakage method has emerged as a popular and practical method for quantifying the amount of damage inflicted on plant tissue by exposure to freezing temperatures. Numerous approaches for carrying out this method and analyzing the resultant data have emerged. These include multiple systems for standardizing and modeling raw electrolyte leakage data and multiple protocols for boiling samples in order to maximize leakage as a positive control. We compare four different routines for standardization of leakage data and assess a novel control method - immersion in liquid nitrogen in lieu of traditional boiling – and apply them to woody twigs collected from 12 maple (Acer) species in early spring. We compare leakage data from these samples using each of four previously published forms of data analysis and boiling vs. liquid nitrogen controls and validate each of these approaches against visual estimates of freezing damage and differential thermal analysis. Results. Through presentation of our own data and re-analysis of previously published findings, we show that standardization of raw data against estimates of both minimum and maximum attainable freezing damage allows for reliable estimation of cold hardiness at the species level and across studies in diverse systems. Furthermore, use of our novel liquid nitrogen control produces data commensurate across studies and enhances the consistency and realism of the electrolyte leakage method, especially for very cold hardy samples. Conclusion. Future leakage studies that relativize data against minimum and maximum leakage and that employ our updated liquid nitrogen control will contribute generalizable, repeatable, and realistic data to the existing body of cold hardiness research in woody plants. Data from studies conducted using a liquid nitrogen (and not a boiling) control can still be compared to previously published data, especially when raw data are standardized using the best-performing approach among those we assessed. Electrolyte leakage of woody twigs emerges as a useful technique for quickly assessing the probability of tissue death in response to freezing in dormant plants. Differential thermal analysis may provide different and complementary information on cold hardiness.

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