Showing papers by "Edwin E. Budzinski published in 1975"
TL;DR: Several primary radiation products produced by ionizing radiation in the nucleoside thymidine have been stabilized at 4.2°K; two have been identified by ESR−ENDOR spectroscopy as discussed by the authors.
Abstract: Several primary radiation products produced by ionizing radiation in the nucleoside thymidine have been stabilized at 4.2°K; two have been identified by ESR−ENDOR spectroscopy. One of these products is formed by reduction of the thymine ring. The other product results from the loss of a hydrogen atom from the 5′−hydroxy group.
57 citations
TL;DR: In this paper, the hyperfine coupling tensor for the C6-H proton was deduced from endor measurements; the principal values are −59.12, −32.92, and −16.24 MHz.
Abstract: Anions formed by the addition of an electron to the uracil base were observed in single crystals of the barium salt of uridine 5′ phosphate x‐irradiated at 4.2 °K. The hyperfine coupling tensor for the C6–H proton was deduced from ENDOR measurements; the principal values are −59.12, −32.92, and −16.24 MHz. Similar measurements were made on single crystals of cytidine 3′ phosphate. The principal values for the C6–H proton hyperfine coupling in the anion formed on the cytosine base are −59.26, −33.98, and −14.68 MHz.
37 citations
TL;DR: In this paper, the characteristics of proton couplings in primary radiation products in irradiated protein and nucleic acid constituents are described, and a close correlation between σ proton coupling tensors in conjugated oxidation and reduction products and principal axes derived from crystal structure is demonstrated.
Abstract: The characteristics of proton couplings in primary radiation products in irradiated protein and nucleic acid constituents are described. The range of β proton couplings in carboxylic acid anions is shown to be much smaller than for typical β couplings in π‐electron radicals. A close correlation between σ proton coupling tensors in conjugated oxidation and reduction products and principal axes derived from crystal structure is demonstrated. Proton hyperfine coupling tensors in the primary oxidation product of aminoisobutyric acid and the 13C hyperfine coupling tensor in the primary reduction product are reported.
17 citations
TL;DR: In this paper, single crystals of 5,6−dihydro−6−methyluracil and its ND analog, x−irradiated at 42°K, were made and the radiation products were identified by analysis of the hyperfine splitting.
Abstract: ESR and ENDOR measurements have been made on single crystals of 5,6−dihydro−6−methyluracil and its ND analog, x−irradiated at 42°K The radiation products are identified by analysis of the hyperfine splitting (AIP)
14 citations
TL;DR: In this paper, the competition for electrons between succinic acid and fumaric acid in doped crystals was examined at 4.2 °K, and the results showed that succinic acid was oxidized by loss of hydrogen from the saturated carbon atoms as well as from the carboxyl groups.
Abstract: The oxidation of succinic acid was observed by ESR–ENDOR spectroscopy in single crystals x irradiated at 4.2 °K. Oxidation products result from loss of hydrogen from the saturated carbon atoms as well as from the carboxyl groups. Reduction is a more specific process; electrons are captured by carbonyl oxygen atoms. The competition for electrons between succinic acid and fumaric acid in doped crystals was examined at 4.2 °K.
12 citations
TL;DR: Several primary radiation products produced by ionizing radiation in the nucleoside thymidine have been stabilized at 4.2°K; two have been identified by ESR−ENDOR spectroscopy as discussed by the authors.
Abstract: Several primary radiation products produced by ionizing radiation in the nucleoside thymidine have been stabilized at 4.2°K; two have been identified by ESR−ENDOR spectroscopy. One of these products is formed by reduction of the thymine ring. The other product results from the loss of a hydrogen atom from the 5′−hydroxy group.
3 citations
TL;DR: In this article, single crystals of 5,6−dihydro−6−methyluracil and its ND analog, x−irradiated at 4.2°K were measured and the radiation products were identified by analysis of hyperfine splitting.
Abstract: ESR and ENDOR measurements have been made on single crystals of 5,6−dihydro−6−methyluracil and its ND analog, x−irradiated at 4.2°K. The radiation products are identified by analysis of the hyperfine splitting. (AIP)
TL;DR: In this article, the hyperfine coupling tensor for the C6-H proton was deduced from endor measurements; the principal values are −59.12, −32.92, and −16.24 MHz.
Abstract: Anions formed by the addition of an electron to the uracil base were observed in single crystals of the barium salt of uridine 5′ phosphate x‐irradiated at 4.2 °K. The hyperfine coupling tensor for the C6–H proton was deduced from ENDOR measurements; the principal values are −59.12, −32.92, and −16.24 MHz. Similar measurements were made on single crystals of cytidine 3′ phosphate. The principal values for the C6–H proton hyperfine coupling in the anion formed on the cytosine base are −59.26, −33.98, and −14.68 MHz.