Explanipedia

Sensitivity of Altitudinal Ecotypes of the Wild Tomato Lycopersicon hirsutum to Chilling Injury Open

John K. Raison, Murray A. Brown · 1989

The transition temperature of the leaf polar lipids and the critical temperature for chill-induced inhibition of photosynthesis was determined for three altitudinal ecotypes of the wild tomato Lycopersicon hirsutum. Photosynthesis was meas…

Compositional and Thermal Properties of Thylakoid Polar Lipids of Nerium oleander L. in Relation to Chilling Sensitivity Open

Glenda R. Orr, John K. Raison · 1987

The polar lipid classes from thylakoids of Nerium oleander L. were studied with the aim of relating changes in their composition and thermal behavior with reported changes in the transition temperature of their polar lipids and chilling se…

Phase Transitions in Liposomes Formed from the Polar Lipids of Mitochondria from Chilling-Sensitive Plants Open

John K. Raison, Glenda R. Orr · 1986

The thermal response of mitochondrial polar lipids from a variety of chilling-sensitive and chilling-insensitive plants was determined by differential scanning calorimetry. A phase transition was observed at 15 degrees C for mitochondria f…

Phase Transitions in Thylakoid Polar Lipids of Chilling-Sensitive Plants Open

John K. Raison, Glenda R. Orr · 1986

The phase behavior of thylakoid polar lipids from plants sensitive to chilling injury was investigated by calorimetry, electron spin resonance spectroscopy of spin labels, and fluorescence intensity after labeling with trans-parinaric acid…

Growth Temperature-Induced Alterations in the Thermotropic Properties of Nerium oleander Membrane Lipids Open

John K. Raison, Carl S. Pike, Joseph A. Berry · 1982

The temperature boundary for phase separation of membrane lipids extracted from Nerium oleander leaves was determined by analysis of spin label motion using electron spin resonance spectroscopy and by analysis of polarization of fluorescen…

Thermal Behavior and Lipid Composition of Cauliflower Plasma Membranes in Relation to ATPase Activity and Chilling Sensitivity Open

Lesley C. Wright, Edward J. McMurchie, M. Keith Pomeroy, John K. Raison · 1982

A plasma-membrane fraction rich in ion-stimulated ATPase activity was isolated from cauliflower (Brassica oleracea L.) buds. The activity of the ATPase was dependent on Mg(2+) and stimulated 4-fold by K(+). The lipids of the membrane fract…

Correlation between Changes in Mitochondrial Membranes of Artichoke Tubers and Their Hardening and Dormancy Open

Lesley C. Wright, John K. Raison · 1981

Spin labeling studies using mitochondrial membranes of Jerusalem artichoke (Helianthus tuberosus L.) showed that the decrease during winter in the temperatures of the upper and lower lipid transitions correlated with the development of fre…

Maintenance of Membrane Fluidity during Development of Freezing Tolerance of Winter Wheat Seedlings Open

M. Keith Pomeroy, John K. Raison · 1981

Fluidity of membrane lipids of shoot and root tissue and of chloroplasts from young wheat seedlings of contrasting freezing tolerance was investigated by measuring the motion and order parameters after spin labeling. A striking similarity …

Seasonal Changes in the Structure and Function of Mitochondrial Membranes of Artichoke Tubers Open

Garry N. Hannon, John K. Raison · 1979

Changes in the temperature response, fluidity, function and the acyl fatty acid composition, were determined for a mitochondria-rich membrane fraction from Jerusalem artichoke (Helianthus tuberosus L.) tubers during dormancy for a crop whi…

Seasonal Changes in the Structure and Function of Mitochondrial Membranes of Artichoke Tubers Open

E. A. Chapman, Lesley C. Wright, John K. Raison · 1979

The temperature limits of the order-disorder transition, and the Arrhenius activation energy of succinate oxidase activity for mitochondria of Jerusalem artichoke (Helianthus tuberosus L.) tubers were determined from the initiation to the …

Wheat Mitochondria Open

John K. Raison, E. A. Chapman, P. Y. White · 1977

Mitochondrial oxidative activity and membrane lipid structure of two wheat (Triticum aestivum L.) cultivars were measured as a function of temperature. The Arrhenius activation energy for the oxidation of both succinate and alpha-ketogluta…

Occurrence of a Temperature-induced Phase Transition in Mitochondria Isolated from Apple Fruit Open

W. B. McGlasson, John K. Raison · 1973

Mitochondria were isolated from fruit of six cultivars of apples differing in susceptibility to the physiological disorder, low temperature breakdown. The state 3 rate of succinate-dependent oxygen uptake and the motion of a spin label wer…

Hibernation: Alteration of Mitochondrial Membranes as a Requisite for Metabolism at Low Temperature Open

John K. Raison, James M. Lyons · 1971

Lipids of mitochondrial membranes from hepatic cells of active ground squirrels apparently go through a phase change induced at approximately 23°C similar to the phase change in mitochondria of homeotherms. This change was indicated by the…

Temperature-induced Phase Changes in Mitochondrial Membranes Detected by Spin Labeling Open

John K. Raison, Joseph Lyons, Rolf J. Mehlhorn, Alec D. Keith · 1971

Molecular motion data from a spin-labeled fatty acid presented on Arrhenius graphs allow melting points or phase transitions to be inferred in local domains such as membranes. With use of this technique, mitochondria from a chilling-sensit…

Oxidative Activity of Mitochondria Isolated from Plant Tissues Sensitive and Resistant to Chilling Injury Open

James M. Lyons, John K. Raison · 1970

Arrhenius plots of the respiration rates of mitochondria isolated from chilling sensitive plant tissues (tomato and cucumber fruit, and sweet potato roots) showed a linear decrease from 25 C to about 9 to 12 C (with Q(10) values of 1.3 to …

The Influence of Mitochondrial Concentration and Storage on the Respiratory Control of Isolated Plant Mitochondria Open

John K. Raison, James M. Lyons · 1970

The respiration of mitochondria isolated from various plant tissues was studied over a range of mitochondrial concentrations and at various times after isolation. Respiration at 25 C expressed as nanomoles of O(2) per minute per milligram …

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