最新刊期
期 4 ， 1996
- 摘要：One-electron reduction potential of ortho-phenanthroline-5,6-phenanthrolinequinone in the aqueous solution of pH 7 phosphate buffer was determined by nano-second pulse radiolysis. The 2,6-dimethylbenzoquinone was used as a reference compound.关键词：One-electron reduction potential;Pulse radiolysis;ortho-Phenan-throline-5,6-quinone
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发布时间：2023-04-23 - 摘要：Polyvinyl alcohol amidoxime chelate fiber containing groups (PV-AAO-AA) was synthesized by preirradiation graft copolymerization and amidoximation. The irradiation dose and ratio of monomer (acrylonitrile and acrylic acid), influence the percentage of grafting, content of amidoxime group in the grafted product and its adsorption capacity. The behaviour of palladium (Ⅱ) ion adsorption was systematically studied in this paper.关键词：Amidoxime chelate fiber;Carboxyl;γ-irradiation;Graft;Palladium;Adsorption
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发布时间：2023-04-23 - 摘要：The electron beam curred(EBC) coating composed of epoxy-acrylates resin as oligomer have been used in vast area. The microstructure of the coating is closely correlated with moleculers structure the components and radiation dose during curing. The S-parameter of positron annhilation doppler broadening was measurred as a function of positron energy to study electron irradiation induced polymerization and crosslinking. The correlations of S-parameter with content, moleculers structure of reactive diluent, and irradiation dose were observed.关键词：Irradiation curring coating;Slow positron beam;Doppler broadening;Epoxy acrylate
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发布时间：2023-04-23 - 摘要：A Water-soluble temperature sensitive polymer, polyNIPAAm, was synthesized by radiation technology in H2O-THF mixed solutions and further, in simple alcohols, ketones and Cl-containing organic compounds as the solvents. The results showed that all the synthesis was successful. Several polyNIPAAm with different molecular weight were obtained in this way. In addition, the concentration effects of Au2+ in dilute aqueous solutions was investigated by using polyNIPAAm obtained in this work. The concentration coefficient could come up to more than 90%. The effects of acidity and concentration coefficient in the solution were investigated. The optimum conditions were obtained.关键词：Temperature sensitive polymer;Poly N-isopropylacrylamide;Gold ion;Radiation polymerization
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发布时间：2023-04-23 - 摘要：The separation of radiolysis products of deaerated baicalin ethanolic solution by reverse HPLC was studied, especially, the functions of acid in eluents and the influence of solvent strength on separation were discussed. Twelve radiolysis products were successfully separated on the enhanced ODS column with eluent 37%CH3OH+63% (0.01%CF3COOH-H2O).关键词：Baicalin;HPLC;Radiolysis product;Separation
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发布时间：2023-04-23 - 摘要：Blending, radiation, chemical post-treating methods are employed to modify the surface of low density polyethylene (LDPE) sheets in order to enhance their hydrophilicity, and the contact angles of the modified LDPE sheets with water are measured and analyzed. It has been found that by blending to LDPE sample ethylene-vinylacetate copolymer (EVA) and itaconate (IA) and then treating with NaOH-methanol liquid after radiation, the improved surface of LDPE is prepared.关键词：Polyethylenl;Surface modification;Blending modification
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发布时间：2023-04-23 - 摘要：In this paper, the photochemical properties of some benzoyl Photoinitiators, e.g. HIPK, KIP-100 F, BP and ESACURE TZT were studied using the N 121 UV curing tester. The photoactivation of triethanol amine (TEA) and the sensitization of fluorescein were also studied. It was shown that their photo-chemical reactivity is higher, the photoactivation of TEA upon them is greater, the sensitization of fluorescein upon KIP-100 F is larger than upon ESACURE TZT/TEA systems.关键词：Photointiating-reactivity;Triethanol amine;Photoactivation;Fluorescein;Sensitization
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发布时间：2023-04-23 -
REPAIR SYNTHESIS OF DAMADGE DNA IN TOBACCO SEEDS INDUCED BY STRONG PULSED ELECTRON AND Ar+ ION BEAMS
摘要：DNA repair synthesis of tobacco seeds induced by strong pulsed electron and Ar+ ion beams was studied with 3H-TdR incorporation method and DNA inhibitor treatment. It was found that there were much more incorporated 3H-TdR during 28~44 hours of germination in implanted seeds than that in normal seeds, and there were two DNA synthesis peaks during early stage of germination(within 60 hours) in the implanted seeds, but only one peak in normal seeds. The first DNA synthesis peak of the irradiated seeds was strongly suppressed by caffeine which is an inhibitor of DNA repair synthesis, the second one was strongly suppressed by hydroxyurea which is an inhibitor of DNA replication. These results indicated that both of strong pulsed electron and Ar+ ion beams could induce the damadge and repair of DNA in tobacco seeds. DNA repair synthesis started after 28 hours of germination and reached peak at the 36 th or 40 th hour in irradiated seeds. The peak of DNA repair synthesis was 12 or 16 hours earlier than that of DNA replication.关键词：Pulsed electron beam;Ar+ ion beam;DNA repair synthesis;Tobacco seeds- 2
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发布时间：2023-04-23 - 摘要：The imature embryo callus of wheat were radiated by γ-rays of different doses. When the dose was below 5 Gy, the relative growth rate of callus increased, the aberration frequency of callus and chromosomes were very low. When the dose was above 15 Gy, the aberration frequency of cells and chromosomes increased significantly, but the growth rate of callus decreased significantly, thus much callus grew so slowly and died. When the dose was 10 Gy, the aberration frequency of cells and chromosomes were not very low, and the growth of callus was not greatly inhibited. So, 10 Gy may be regarded as a suitable radiation dose for wheat imature embryo callus.关键词：Wheat imature embryo;Callus;γ-radiation;Inductive effect
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发布时间：2023-04-23 - 摘要：The present study was designed to observe the effects of acetylcholine (Ach) on the proliferative reaction of the splenocytes irradiated with low dose X-rays in Kunmin male mice in vivo and in vitro. The results showed that Ach enhanced significantly the spontaneous proliferations of the splenocytes and the responses of the splenocytes to ConA. But, the immune functional changes of the splenocytes irradiated with 75 mGy in vivo and in vitro were different. It would increase more in vivo, while less in vitro. These results suggest that Ach may stimulate the splenocyte proliferative reaction and participate in the immunoenhanced effect following low dose radiation to a certain extent. However, the action mechanism of Ach on the immune functional changes of the splenocytes irradiated with low dose X-rays in vivo and in vitro may be different. It is supposed to have relation to the change of the microenvironment of the splenocytes.关键词：X-radiation;Low dose radiation;Acetylcholine;Proliferative reaction
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发布时间：2023-04-23 - 摘要：The purpose of this study was to observe the enhancement of alpha particles induced transformed frequency(TF) of C3H10T 1/2 cells by phorbol myristate acetate (PMA) and active oxygen species released from polymorphonuclear neutrophile (PMN). 2 days and 30 min. after exposure to alpha particles of 241Am PMA or PMA stimulated human blood were added to these cell cultures. 10 days and 6 weeks later the plate efficiency (PE) and TF were determined respectively. The preliminary results obtained from 1250 dishes indicated that PMA could stimulate cell proliferation, it depended on cell densities plated and doses exposed. The enhanced trend of TF in exposed cells by PMA and PMA stimulated PMN were observed, it seemed as it the exposed cells of 0.5 Gy: their TF increased 2.1 and 2.8 fold by PMA and PMA stimulated PMN respectively.关键词：Phorbol myristate acetate;Polymorphonuclear neutrophile (PMN);Active oxygen species;Alpha particles;Cell transformation
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发布时间：2023-04-23 - 摘要：Estrogen is a factor supporting the equilibrium of bone metabolism and inhibiting the immunological function of lymphocytes. In this paper, the occlusion of ovarian follicle, the reduction of estrodiol secretion, the increase of values of Ca/cr and HOP/cr in urine and ALP in serum, the decrease of MTN (mean trabeculae number) and MTV, (mean trabeculae volume) and the increase of proliferation and secretion of IL-2 in splenic of rats wese observed when their ovaries had been irradiation with X-rays of 50Gy. There was obviouse negative correlation between the IL-2 secretion and the level of estrodiol in serum. It also showed marked positive correlation between the level of calcium in urine and the activity of IL-2 secreted by splenic lymphocytes. It was suggested that the bone metabolism and the immunological function of lymphocytes could be influenced by the ovaries exposed to irradiation. The effect of estrogen on bone metabolism might be mediated by IL-2.关键词：Radiation effect;Ovary;Bone metabolism;Immunological function;Interlukin-2
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发布时间：2023-04-23 - 摘要：In situ hybridization was used to examine the expression of c-fos mRNA in mouse thymus, spleen and lymph node following whole body irradiation(WBI) with 75mGy X-rays. The results showed that the basal expression of c-fos mRNA in macrophages, interdigitating cells and some large lymphocytes of thymus, spleen and mesenteric lymph node was markedly enhanced after WBI with 75mGy X-rays. The expression of c-fos mRNA in the thymus and spleen reached its peak 1 h and 2 h after irradiation respectively and both returned to the sham-irradiated level 12 h after irradiation. However, the increase in expression of c-fos mRNA in the lymph node was not so marked but lingered longer after irradiation. The implications of these findings were briefly discussed in connection with our previous data.关键词：Low dose radiation;Protooncogene;c-fos
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发布时间：2023-04-23 - 摘要：AgNORs (argyrophilic proteins associated nucleolar organizer regions) has been used to identify whether the cells are malignant or not in the cancer research. It was studied by means of morphometerology, in this report, that changes of AgNORs counting and some morphometric parameters of human embryo lung cell line (HEL-9402) appeared significantly after the HEL-9402 was irradiated by 60Co γ-ray. The change character of AgNORs number showed a tendency of increasing gradually with increase of irradiation doses. The implication of changes of AgNORs' area, perimeter and equivalent diameter is not sure although they changed obviously, because they were influenced by the changes of cell nuclei. In conclusion, AgNORs counting may be used to study the relationship between effects and doses during cell neoplastic transformation induced by radiation and expected to become a parameter of identifying malignant degree of transformed cells.关键词：γ-irradiation;AgNORs;Morphometerology
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发布时间：2023-04-23
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