Electrokinetic parameters of ion transport across isolated pepper cuticular membranes |
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| Institution: | 1. Department de Física Aplicada, Facultad de Ciencias, Universidad de Málaga, E-29071 Málaga, Spain;2. Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad de Málaga, E-29071 Málaga, Spain;1. Department of Pharmacy, Xi''an Medical University, Xi''an, 710021, China;2. School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, 712046, China;1. Institute of Materia Medica, Shandong Academy of Medical Sciences, Jinan, Shandong 250062, PR China;2. School of Medicine and Life Sciences, University of Jinan, Shandong Academy of Medical Sciences, Jinan, Shandong 250062, PR China;3. Departments of Pharmacology, Case Western Reserve University, Cleveland, Ohio 44106-4965;4. Departments of Biochemistry, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106-4965;5. Center for Proteomics and Bioinformatics, Center for Synchrotron Biosciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106-4988;1. College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, China;2. Key Laboratory of Saline-Alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, 150040, China;3. College of Life Sciences, Northeast Forestry University, Harbin, 150040, China;1. Weinan Central Hospital, Shengli Rd, Weinan, 714000, PR China;2. Shaanxi University of Chinese Medicine, Western Century Avenue, Xianyang, 712046, PR China;1. Department of Systems Biotechnology, Konkuk University, Seoul 143-701, Korea;2. Molecular Breeding Division, Natural Academy of Agricultural Science, Rural, Development Adminstration, Suwon 441-857, Korea |
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| Abstract: | The transport of NaCl and CaCl2 solutions across isolated pepper cuticular membranes was studied by means of conductivity, membrane potential and diffusion experiments. Some characteristic membrane parameters such as the electrical resistance, ionic and salt permeabilities were obtained as a function of the electrolyte concentrations. Cuticle morphological asymmetry accounts for differences in membrane potential values under external reverse gradients. The influence of temperature on the membrane structure was also considered, but only small changes in the electrokinetic parameters were obtained. From the NaCl diffusion experiments two activation energies were determined (54.8 kJ/mol for temperature ranging between 15 and 35°C, and 20.6 kJ/mol for the interval of temperature between 40 and 60°C), which could be associated to thermal transitions in the molecular structure of the cuticle for the interval 30–40°C. |
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