Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation
The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturati...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1979 |
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| Reproduktion: |
Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 |
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| Übergeordnetes Werk: |
in: Biochimica et Biophysica Acta (BBA)/Bioenergetics - Amsterdam : Elsevier, 548(1979), 1, Seite 16-29 |
| Übergeordnetes Werk: |
volume:548 ; year:1979 ; number:1 ; pages:16-29 |
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NLEJ185706045 |
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| 245 | 1 | 0 | |a Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation |
| 264 | 1 | |c 1979 | |
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| 520 | |a The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. | ||
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(DE-627)NLEJ185706045 (DE-599)GBVNLZ185706045 DE-627 ger DE-627 rakwb eng Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation 1979 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Rupp, H. oth Moore, A.L. oth in Biochimica et Biophysica Acta (BBA)/Bioenergetics Amsterdam : Elsevier 548(1979), 1, Seite 16-29 (DE-627)NLEJ177198850 (DE-600)2209370-9 0005-2728 nnns volume:548 year:1979 number:1 pages:16-29 http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 548 1979 1 16-29 |
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(DE-627)NLEJ185706045 (DE-599)GBVNLZ185706045 DE-627 ger DE-627 rakwb eng Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation 1979 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Rupp, H. oth Moore, A.L. oth in Biochimica et Biophysica Acta (BBA)/Bioenergetics Amsterdam : Elsevier 548(1979), 1, Seite 16-29 (DE-627)NLEJ177198850 (DE-600)2209370-9 0005-2728 nnns volume:548 year:1979 number:1 pages:16-29 http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 548 1979 1 16-29 |
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(DE-627)NLEJ185706045 (DE-599)GBVNLZ185706045 DE-627 ger DE-627 rakwb eng Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation 1979 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Rupp, H. oth Moore, A.L. oth in Biochimica et Biophysica Acta (BBA)/Bioenergetics Amsterdam : Elsevier 548(1979), 1, Seite 16-29 (DE-627)NLEJ177198850 (DE-600)2209370-9 0005-2728 nnns volume:548 year:1979 number:1 pages:16-29 http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 548 1979 1 16-29 |
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(DE-627)NLEJ185706045 (DE-599)GBVNLZ185706045 DE-627 ger DE-627 rakwb eng Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation 1979 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Rupp, H. oth Moore, A.L. oth in Biochimica et Biophysica Acta (BBA)/Bioenergetics Amsterdam : Elsevier 548(1979), 1, Seite 16-29 (DE-627)NLEJ177198850 (DE-600)2209370-9 0005-2728 nnns volume:548 year:1979 number:1 pages:16-29 http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 548 1979 1 16-29 |
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(DE-627)NLEJ185706045 (DE-599)GBVNLZ185706045 DE-627 ger DE-627 rakwb eng Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation 1979 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Rupp, H. oth Moore, A.L. oth in Biochimica et Biophysica Acta (BBA)/Bioenergetics Amsterdam : Elsevier 548(1979), 1, Seite 16-29 (DE-627)NLEJ177198850 (DE-600)2209370-9 0005-2728 nnns volume:548 year:1979 number:1 pages:16-29 http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 548 1979 1 16-29 |
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characterization of iron-sulphur centres of plant mitochondria by microwave power saturation |
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Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation |
| abstract |
The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. |
| abstractGer |
The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. |
| abstract_unstemmed |
The electron spin relaxation of iron-sulphur centres and ubisemiquinones of plant mitochondria was studied by microwave power saturation of the respective EPR signals. In the microwave power saturation technique, the experimental saturation data were fitted by a least-squares procedure to a saturation function which is characterized by the power for half-saturation (P"1"2) and the inhomogeneity parameter (b). Since the theoretical saturation curves were based on a one-electron spin system, it became possible to differentiate between EPR signals of iron-sulphur centres which have similar g values but different P"1"2 values. If the difference in the P"1"2 values of the overlapped components was small, no significant deviation from these theoretical saturation curves was observed, as shown for the overlapped signals of centre S-3 and the Ruzicka centre of mung bean mitochondria. By contrast, the microwave power saturation data for the g = 1.93 signal (17-26 K) of Arum maculatum submitochondrial particles reduced by succinate could not be fitted using one-electron saturation curves. Reduction by NADH resulted in a stronger deviation. Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. Furthermore, a relaxation enhancement was observed for centre S-1 of A. maculatum submitochondrial particles upon reduction of centre S-2 by dithionite. This indicated a magnetic interaction between centres S-1 and S-2. |
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| title_short |
Characterization of iron-sulphur centres of plant mitochondria by microwave power saturation |
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http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90183-X |
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Rupp, H. Moore, A.L. |
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Rupp, H. Moore, A.L. |
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2024-07-06T04:45:44.791Z |
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Since the iron-sulphur centres of Complex I were present only in an unusually low concentration in A. maculatum mitochondria, it was proposed that an iron-sulphur centre of the external NADH dehydrogenase contributes to the spectrum of centre S-1. For mung bean mitochondria, the g = 1.93 signal below 20 K could be attributed mainly to centre N-2. The microwave power saturation technique was also suitable for detecting magnetic interactions between paramagnetic centres. From the saturation data of the complex spectrum attributable to centre S-3 and an interacting ubisemiquinone pair in mung bean mitochondria (oxidized state) followed that centre S-3 has a faster electron spin relaxation than the ubisemiquinone molecules. It is noteworthy that the differences in the relaxation rates were maintained despite the interaction between centre S-3 and the ubisemiquinones. 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7.4019556 |