| | 1 | Author
| SeymourSteven Brody | Requires cookie* | | | Title
| Temperature Induced S p ectral C h an ges o f Chlorophyll in M ic e lle s and S o lu tio n  | | | | Abstract
| Effects of temperature on the spectral properties o f chlorophyll in solution and in m icelles are reported. After correcting for the volum e expansion coefficient o f the solvent, it is observed that temperature has no detectable effects on the spectral properties o f chlorophyll (between 14 °C to 35 °C). Solutions exam ined include acetone, chloroform and ethyl alcohol. It is concluded that the temperature induced change in refractive index, o f the solvent, has no significant affect on the chlorophyll sp ec trum. In micelles containing chlorophyll there are significant temperature induced spectral changes. Heating and cooling results in an irreversible redistribution o f m onom eric and oligomeric forms o f chlorophyll. | | | |
Reference
| Z. Naturforsch. 39c, 685—686 (1984); received February 17 1984 | | | |
Published
| 1984 | | | |
Keywords
| Chlorophyll, Micelles, Vesicles, Spectral Changes | | | |
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| default:Reihe_C/39/ZNC-1984-39c-0685_n.pdf | | | | Identifier
| ZNC-1984-39c-0685_n | | | | Volume
| 39 | |
| 2 | Author
| S. S. Brody, J. Barber, C. Tredwell, G. Beddard | Requires cookie* | | | Title
| Effects of Linolenic Acid on the Spectral Properties and Picosecond Fluorescence of Pea Chloroplasts | | | | Abstract
| Linolenic acid induces changes in the absorption spectrum and in the picosecond fluorescence of pea chloroplasts. The effects o f linolenic acid are dependent on concentration and time. Linolenic acid increases the fluorescence life time o f chloroplasts at room temperature. The contribution of the slow fluorescence component relative to the fast component is increased almost 10 fold in the presence o f 0.5 m M linolenic acid. The synergistic action o f digitonin and linolenic acid increases the ratio o f "closed" to "open" traps in the photosynthetic units. Upon addition o f 0.5 m M linolenic acid there are increases in absorbance at 676 and 436 nm, and decreases in absorbance at 705 and 496 nm. Some o f the spectral changes have a biphasic character, they reach a maxi um um after about 30 min then start to reverse. Based on the spectral changes at 496 and 705 nm it appears that linolenic acid has at least two effects, e. it modifies the thylakoid membrane and secondarily decreases the concentration of P 700, respectively. | | | |
Reference
| Z. Naturforsch. 36c, 1021—1024 (1981); received May 201981 | | | |
Published
| 1981 | | | |
Keywords
| Photosynthesis, Chloroplasts, Fluorescence Lifetimes, Linolenic Acid, Spectral Changes | | | |
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| default:Reihe_C/36/ZNC-1981-36c-1021.pdf | | | | Identifier
| ZNC-1981-36c-1021 | | | | Volume
| 36 | |
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