801
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Dessau DS, Wells BO, Shen Z, Spicer WE, Arko AJ, List RS, Mitzi DB, Kapitulnik A. Anomalous spectral weight transfer at the superconducting transition of Bi2Sr2CaCu2O8+ delta. PHYSICAL REVIEW LETTERS 1991; 66:2160-2163. [PMID: 10043406 DOI: 10.1103/physrevlett.66.2160] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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802
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Qureshi AA, Qureshi N, Wright JJ, Shen Z, Kramer G, Gapor A, Chong YH, DeWitt G, Ong A, Peterson DM. Lowering of serum cholesterol in hypercholesterolemic humans by tocotrienols (palmvitee). Am J Clin Nutr 1991; 53:1021S-1026S. [PMID: 2012010 DOI: 10.1093/ajcn/53.4.1021s] [Citation(s) in RCA: 212] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A double-blind, crossover, 8-wk study was conducted to compare effects of the tocotrienol-enriched fraction of palm oil (200 mg palmvitee capsules/day) with those of 300 mg corn oil/d on serum lipids of hypercholesterolemic human subjects (serum cholesterol 6.21-8.02 mmol/L). Concentrations of serum total cholesterol (-15%), LDL cholesterol (-8%), Apo B (-10%), thromboxane (-25%), platelet factor 4 (-16%), and glucose (-12%) decreased significantly only in the 15 subjects given palmvitee during the initial 4 wk. The crossover confirmed these actions of palmvitee. There was a carry over effect of palmvitee. Serum cholesterol concentrations of seven hypercholesterolemic subjects (greater than 7.84 mmol/L) decreased 31% during a 4-wk period in which they were given 200 mg gamma-tocotrienol/d. This indicates that gamma-tocotrienol may be the most potent cholesterol inhibitor in palmvitee capsules. The results of this pilot study are very encouraging.
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803
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Pappas DP, Kämper K, Miller BP, Hopster H, Fowler DE, Brundle CR, Luntz AC, Shen Z. Spin-dependent electron attenuation by transmission through thin ferromagnetic films. PHYSICAL REVIEW LETTERS 1991; 66:504-507. [PMID: 10043824 DOI: 10.1103/physrevlett.66.504] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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804
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Lin SZ, Shen Z. Effects of amobarbital on pterins and dinucleotides contents in rat brain. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1991; 12:12-6. [PMID: 1950577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The effects of amobarbital (50 mg.kg-1 ip) on the brain concentrations of biopterin, pterin, reduced nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) were studied by a reverse phase high performance liquid chromatography with fluorescent detector. Amobarbital increased FAD concentrations in 5 brain areas and pterin concentration in the cortex, but decreased biopterin concentrations in the cortex and hippocampus.
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805
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Wells BO, Shen Z, Dessau DS, Spicer WE, Olson CG, Mitzi DB, Kapitulnik A, List RS, Arko A. Angle-resolved-photoemission study of Bi2Sr2CaCu2O8+ delta : Metallicity of the Bi-O plane. PHYSICAL REVIEW LETTERS 1990; 65:3056-3059. [PMID: 10042768 DOI: 10.1103/physrevlett.65.3056] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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806
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Gunnarsson O, Jepsen O, Shen Z. Local singlet for CuO and Nd2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:8707-8709. [PMID: 9995069 DOI: 10.1103/physrevb.42.8707] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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807
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Shen Z, List RS, Dessau DS, Parmigiani F, Arko AJ, Bartlett R, Wells BO, Lindau I, Spicer WE. Photoemission study of CuO and Cu2O single crystals. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:8081-8085. [PMID: 9994977 DOI: 10.1103/physrevb.42.8081] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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808
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Abstract
The effects of amphetamine (1.5 mg/kg) and caffeine (120 mg/kg, 75 mg/kg) on shuttle behavior and on the concentrations of reduced nicotinamide adenine dinucleotide (NADH) of the brain were studied in 56 rats from the perspective of regional brain metabolism. Amphetamine potentiated the shuttle behavior including avoidance responses and response speed, while it increased NADH concentrations in the hippocampus. The low dose of caffeine increased avoidance responses. The high dose of caffeine inhibited avoidance responses, but it had no effect on NADH concentrations in discrete brain regions.
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809
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Wells BO, Shen Z, Harrison WA, Spicer WE. Reply to the "Comment on 'Valence-band states in Bi2(Ca,Sr,La)3Cu2O8.' ". PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:4785. [PMID: 9996020 DOI: 10.1103/physrevb.42.4785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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810
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Shen Z, Briens C, Bergougnou M, Kwauk M. Study of a downward grid jet in a large two-dimensional gas-fluidized bed. POWDER TECHNOL 1990. [DOI: 10.1016/0032-5910(90)80109-c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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811
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Shen Z, Briens CL, Kwauk M, Bergougnou MA. Study of a downward gas jet in a two-dimensional fluidized bed. CAN J CHEM ENG 1990. [DOI: 10.1002/cjce.5450680402] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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812
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Shen Z, Allen JW, Lindberg PA, Dessau DS, Wells BO, Borg A, Ellis W, Kang JS, Oh S, Lindau I, Spicer WE. Photoemission study of CoO. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:1817-1828. [PMID: 9995615 DOI: 10.1103/physrevb.42.1817] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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813
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Shen Z, Shih CK, Jepsen O, Spicer WE, Lindau I, Allen JW. Aspects of the correlation effects, antiferromagnetic order, and translational symmetry of the electronic structure of NiO and CoO. PHYSICAL REVIEW LETTERS 1990; 64:2442-2445. [PMID: 10041713 DOI: 10.1103/physrevlett.64.2442] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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814
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Gunnarsson O, Allen JW, Jepsen O, Fujiwara T, Andersen OK, Olsen CG, Maple MB, Kang J, Liu LZ, Park J, Anderson RO, Ellis WP, Liu R, Markert JT, Dalichaouch Y, Shen Z, Lindberg PA, Wells BO, Dessau DS, Borg A, Lindau I, Spicer WE. Polarized resonance photoemission for Nd2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:4811-4814. [PMID: 9994326 DOI: 10.1103/physrevb.41.4811] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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815
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Lindberg PA, Shen Z, Wells BO, Mitzi DB, Lindau I, Spicer WE, Kapitulnik A. Electronic structure of clean and Ag-covered single-crystalline Bi2Sr2CuO6. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:8769-8773. [PMID: 9991354 DOI: 10.1103/physrevb.40.8769] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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816
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Lindberg PA, Shen Z, Wells BO, Dessau DS, Ellis WP, Borg A, Kang J, Mitzi DB, Lindau I, Spicer WE, Kapitulnik A. Photoemission study of absorption mechanisms in Bi2.0Sr1.8Ca0.8La0.3Cu2.1O8+ delta, BaBiO3, and Nd1.85Ce0.15CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:8840-8843. [PMID: 9991366 DOI: 10.1103/physrevb.40.8840] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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817
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Shen Z, Lindberg PA, Wells BO, Dessau DS, Borg A, Lindau I, Spicer WE, Ellis WP, Kwei GH, Ott KC, Kang J, Allen JW. Photoemission study of monoclinic BaBiO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:6912-6918. [PMID: 9991069 DOI: 10.1103/physrevb.40.6912] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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818
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Dessau DS, Shen Z, Lindberg PA, Wells BO, Borg A, Lindau I, Spicer WE, Waszczak JV, Schneemeyer LF. Electronic structure of Pb2Sr2PrCu3O8 as studied by resonant photoemission spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:6726-6730. [PMID: 9991045 DOI: 10.1103/physrevb.40.6726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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819
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Wells BO, Lindberg PA, Shen Z, Dessau DS, Spicer WE, Lindau I, Mitzi DB, Kapitulnik A. Valence-band states in Bi2(Ca,Sr,La)3Cu2O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:5259-5262. [PMID: 9992545 DOI: 10.1103/physrevb.40.5259] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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820
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Lindberg PA, Shen Z, Dessau DS, Wells BO, Mitzi DB, Lindau I, Spicer WE, Kapitulnik A. Energy dispersions of single-crystalline Bi2.0Sr1.8Ca0.8La0.3Cu2.1O8+ delta superconductors determined using angle-resolved photoelectron spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:5169-5171. [PMID: 9992520 DOI: 10.1103/physrevb.40.5169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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821
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Kang J, Allen JW, Maple MB, Torikachvili MS, Ellis WP, Pate BB, Shen Z, Yeh JJ, Lindau I. Fermi-level tuning in Y1-xUxPd3. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:13529-13532. [PMID: 9948262 DOI: 10.1103/physrevb.39.13529] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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822
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Shen Z, Lindberg PA, Dessau DS, Lindau I, Spicer WE, Mitzi DB, Bozovic I, Kapitulnik A. Photoelectron energy-loss study of the Bi2CaSr2Cu2O8 superconductor. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:4295-4298. [PMID: 9948769 DOI: 10.1103/physrevb.39.4295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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823
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Lindberg PA, Shen Z, Wells BO, Dessau DS, Mitzi DB, Lindau I, Spicer WE, Kapitulnik A. Reaction of Rb and oxygen overlayers with single-crystalline Bi2Sr2CaCu2O8+ delta superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:2890-2893. [PMID: 9948571 DOI: 10.1103/physrevb.39.2890] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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824
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Shen Z, Lindberg PA, Soukiassian P, Eom CB, Lindau I, Spicer WE, Geballe TH. Nature of the states near the Fermi level of the layered superconductors of Bi2Ca1Sr2Cu2O8 and Bi2Sr2CuO6. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:823-826. [PMID: 9947242 DOI: 10.1103/physrevb.39.823] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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825
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826
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Shen Z, Lindberg PA, Wells BO, Mitzi DB, Lindau I, Spicer WE, Kapitulnik A. Valence-band and core-level photoemission study of single-crystal Bi2CaSr2Cu2O8 superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:11820-11823. [PMID: 9946074 DOI: 10.1103/physrevb.38.11820] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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827
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Shen Z, Lindberg PA, Lindau I, Spicer WE, Eom CB, Geballe TH. Electronic structure of Bi-Ca-Sr-Cu-O superconductors studied by photoelectron spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:7152-7155. [PMID: 9945426 DOI: 10.1103/physrevb.38.7152] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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828
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Shi H, Xu G, Shen Z. A retrospective study of oral mucosal diseases in three age groups. GERODONTICS 1988; 4:235-7. [PMID: 3271719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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829
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Hwang J, Pianetta P, Pao Y, Shih CK, Shen Z, Lindberg PA, Chow R. k-resolved alloy bowing in pseudobinary InxGa. PHYSICAL REVIEW LETTERS 1988; 61:877-880. [PMID: 10039453 DOI: 10.1103/physrevlett.61.877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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830
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Shen Z, Sherman W, Wilkinson G. Phase transition investigation of AgNO3 at low temperature and high pressure by I.R. studies. J Mol Struct 1988. [DOI: 10.1016/s0022-2860(98)80109-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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831
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Shen Z, Lin SZ. Effects of amphetamine and caffeine on jumping behavior and brain NADH in rats. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1987; 8:97-100. [PMID: 2959013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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832
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Kanosue K, Nakayama T, Andrew PD, Shen Z, Sato M. Neuronal activities in ventrobasal complex of thalamus and in trigeminal main sensory nucleus during EEG desynchronization in anesthetized rats. Brain Res 1986; 379:90-7. [PMID: 2874867 DOI: 10.1016/0006-8993(86)90259-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Activities of somatosensory relay neurons responding to orofacial mechanical stimulation were examined in the ventrobasal complex of the thalamus (VB) and in the trigeminal main sensory nucleus (MSN) during EEG desynchronization in urethane-anesthetized rats. EEG desynchronization was induced by scrotal warming in a temperature range of 35-40 degrees C. Responses of most VB neurons to receptive-field stimulation were augmented during EEG desynchronization, when compared to responses during synchronization. Spontaneous activity of VB neurons also increased with EEG desynchronization. Responses of MSN neurons to receptive-field stimulation did not change appreciably when the EEG pattern was altered. If a VB neuron was induced by iontophoretic application of glutamate to fire at the same rate as seen during EEG desynchronization, a similar increased response to receptive-field stimuli was also observed. The augmented response of the VB neuron during desynchronization may thus have resulted from increased excitability of the neuron itself.
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833
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Shen Z, Wagoner R, Clark W. Dislocation pile-up and grain boundary interactions in 304 stainless steel. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/0036-9748(86)90467-9] [Citation(s) in RCA: 157] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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834
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Bamford T, Hardiman B, Shen Z, Clark W, Wagoner R. Micromechanism of slip propagation through a high angle boundary in alpha brass. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/0036-9748(86)90137-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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835
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Shen Z, Yanase M, Kanosue K, Nakayama T. Effect of periaqueductal morphine injection on thermal response in rats. THE JAPANESE JOURNAL OF PHYSIOLOGY 1986; 36:485-96. [PMID: 3773328 DOI: 10.2170/jjphysiol.36.485] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effect of morphine injection into the midbrain periaqueductal gray (PAG) was examined on thermal response in rats. Rectal temperature (Tre) was recorded in unanesthetized and unrestrained animals before and after PAG morphine injection of 5 or 10 micrograms in cold (10 degrees C), neutral (22 degrees C), and hot (34 degrees C) environments. Both doses of morphine caused hyperthermia. Sixty to 105 min after the injection, Tre rose by 1.0-1.5 degrees C regardless of ambient temperature. Naloxone (2 mg/kg, i.p.) blocked the hyperthermic effects of morphine. Injection sites producing hyperthermia were distributed mostly in the ventral PAG and its ventral environs. The analgesic effect of morphine was examined by the tail-flick test. Locations of morphine injection effective for producing analgesia were restricted to the ventral area of the region responsible for hyperthermia. Magnitude of the hyperthermia did not significantly differ between animals with or without analgesia. The effect of PAG morphine (5 micrograms) was tested on tail vasomotor response to hypothalamic and scrotal thermal stimulations in urethane anesthetized (1.0 g/kg) animals. Threshold hypothalamic temperature for the vasodilation was lower at a scrotal temperature of 40 degrees C than at 30 degrees C. Following PAG morphine, threshold hypothalamic temperature rose and the difference in threshold hypothalamic temperature at the two scrotal temperatures disappeared.
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836
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Tanaka H, Kanosue K, Nakayama T, Shen Z. Grooming, body extension, and vasomotor responses induced by hypothalamic warming at different ambient temperatures in rats. Physiol Behav 1986; 38:145-51. [PMID: 3786495 DOI: 10.1016/0031-9384(86)90145-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
During heat stress, rats extend their body and spread saliva onto their body surfaces (grooming) for evaporative heat loss in addition to tail vasodilation. We investigated the effects of changing hypothalamic (Thy) and ambient (Ta) temperatures on these thermoregulatory responses. The higher the Ta, the lower the Thy at which grooming started when Ta was changed from the thermoneutral zone (24 degrees C) to 28-40 degrees C. At any Ta grooming was induced only when the posterior hypothalamic region (PH) was warmed by implanted diathermy. Grooming was more strongly induced at a Ta of 28 degrees C than at 24 degrees C. At a Ta of 32 degrees C, PH warming evoked body extension as well, decreasing the duration of grooming as compared to that at 28 degrees C. Warming the preoptic area and anterior hypothalamus induced body extension and tail vasodilation regardless of Ta. The data suggest that grooming was induced by integrated temperature signals from the PH and from the peripheral skin.
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837
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Abstract
The effects of either the reduced Nicotinamide Adenine Dinucleotide (NADH) microinjected into the brain or amphetamine injected peritoneally on jumping behavior were observed in 68 rats. The enhanced jumps in the group with amphetamine are the greatest among the three experimental groups. The enhanced effect of NADH microinjected into the caudate nucleus is stronger than those of NADH in the frontal cortex. The effects of extra NADH in the frontal cortex on the jumps are dose-dependent. NADH concentrations in the brain of rats with amphetamine increased immediately after behavioral procedure. The increased concentrations in the brain from both extra and intra sources are related to the enhanced jumps of rats.
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838
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Shen Z, Liang ZM. [Studies on the physical structure and pharmaceutical properties of aluminum hydroxide tablets]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:842-8. [PMID: 6544552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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839
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Sheng P, Wang H, Shen Z. Transfer of radiation-induced spins from deoxyribonucleic and thymidylic acids to propyl gallate. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1982; 25:473-84. [PMID: 6285465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
When calf thymus deoxyribonucleic acid (DNA), propyl gallate (PG) and their five molecular mixtures (with PG content of 1, 2, 5, 10 and 20%) are irradiated with gamma-rays in dry state in vacuum at 296 degrees K, the ESR spectra of all molecular mixtures differ strikingly from those of DNA, but bear a close resemblance to those of PG. The spin yield in the PG contained in these mixtures is two to three orders of magnitude higher than that in the case of PG irradiated separately. Furthermore, on the basis of the relative saturation characteristics of ESR spectra, these molecular mixtures behave more like PG than like DNA. It may be inferred that the radiation-induced spins could be transferred from DNA to PG. With r representing the molar ratio of nucleotides to PG, we have found a good linear correlation between the transfer ratio (TR) and square root of r. One PG molecule could protect at least 68 nucleotides in the duplex DNA chain, and thereby the minimal range of spin transfer is estimated at 115 A. Results obtained from irradiation at 77 degrees K show that PG exerts no protective effect on DNA, so DNA sustains an irreversible damage. It is thought that the spin transfer from DNA to PG is exclusively due to a hydrogen transfer mechanism. We have also demonstrated the transfer of radiation-induced spins from both thermally denatured DNA and TMP to PG. The former process can be ascribed primarily to the hydrogen transfer mechanism, whereas the latter, as in the case of native DNA, exclusively to this mechanism.
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