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Radioiodine Labeling of Insulin Using Dimethylsulfoxide as a Labelling-Aid
Kim, Jaerok,Kim, Young-Hee Korean Nuclear Society 1977 Nuclear Engineering and Technology Vol.9 No.4
Using dimethylsulfoxide (DMSO) as a labelling aid, insulin--$^{126}$ I of radioimmunoassay use has been effectively prepared. A small amount of DMSO was added to usual labelling mixture ana the reaction time was controled. The labelled insulin obtained in such a way showed improved bindabilities to the antibody and thus expressed larger dose-gradients in the plots of standard dose-response curves even though the labelling rate was decreased to some extent. However, by extending the reaction time to about 1 min, average labelling yield of 30% could be obtained. The average increase of bindability (B/F) in definite antiserum dilution was 2.5 comparing with 1.5 obtained in the absence of DMSO. Thus, the net bindability increase was 70% of those obtained in tile absence of DMSO. By means of a NMR spectrometry, it has been confirmed that the DMSO in the labelling mixtutre is converted to dimethylsulfone by chloramine-T. The results, generally agreed with the Stags's postulation, were discussed in view of a competitive oxidation of DMSO with disulfide linkages of the insulin molecule by the chloramine-T.
Kinetic Studies on Halogen Exchange of Substituted Benzenesulfonylbromides
Kim, Jaerok Korean Nuclear Society 1973 Nuclear Engineering and Technology Vol.5 No.4
The rates and activation parameters for the halide exchange reactions of substituted benzenesulfonylbromides (R-C$_{6}$H$_4$SO$_2$Br, R=p-MeO, p-$CH_3$, p-H, p-NO$_2$) in dry acetone at two temperatures were determined. It was found that the nucleophilicity order of Cl->I-$\geq$Br- for strong electron withdrawing-, and mild electron donating group, and of I-$\geq$Cl->Br- for strong electron donating group, Hammett plots showed slightly convoked characteristics which is similar to the plots of substituted benzenesulfonylchlorides, but contrary to the concaved nature for the halide exchange reactions of substituted benzyl chlorides. The rate of halogen exchange between benzenesulfonylbromide and lithium bromide decreased in the order of solvent : ($CH_3$)$_2$CO>$CH_3$CN》MeOH. The rates and activation parameters were also compared with those already known in the substituted benzenesulfonylchlorides. Theses were explained in terms of the structural properties of the transition state, and discussed the reaction mechanisms.s.
Chromatographical Determination of Radiochemical Purity of Hippuran $^131 I$
Kim, Jaerok,Kim, Tae-Ho Korean Nuclear Society 1973 Nuclear Engineering and Technology Vol.5 No.3
A recently known method of paper chromatographical separation of o-iodobenzoic acid-$^{131}$ I and o-iodohippuric acid-$^{131}$ I was found to be in error. The solvent mixture proposed in the method for the efficient separation of the two compounds of similar structure not only be made nonhomogeneous but also brings about no separation. It was also confirmed that no o-iodohippuric acid is converted to o-iodobenzoic acid during the process for Hippuran -$^{131}$ I preparation by isotopic exchange. Upon it, an alternate method of chromato-graphical determination of radiochemical purity of Hippuran-$^{131}$ I is proposed in present paper.
Kim, Jaerok,Lee, Kyung-Hee,Pyun, Hyung-Chick Korean Nuclear Society 1972 Nuclear Engineering and Technology Vol.4 No.4
The polymerization rates of monomer or monomer mixture impregnated with catalyst into domestic soft woods such as pinus densiflora, pinus rigida and poplus deltoides e. t. c. were measured. The results were compared with those obtained by radiation curing method and the following conclusions were derived ; (1) Pinus densiflora and pinus rigida are superior to the poplus deltoides, and methyl methacrylate(M. M. A. ) is more effective than other monomers as far as the polymerization rates are only taken into account. (2) The polymerization rate of vinyl acetate is generally slow. And the polymerization rate of the monomer is the slowest in case of being impregnated into poplus deltoides. However, the polymerization rate of the comonomer composed of vinylacetate and M. M. A. is the fastest among the other monomers or monomer mixtures in woods regardless of the curing method. (3) The general trend of polymerization of monomer in wood is similar to that of monomers themselves in both curing methods if the woods contain not much resin.
A Rapid Preparation of Carrier-Free Fluorine-38 for Medical Use
Kim, You-Sun,Kim, Jaerok Korean Nuclear Society 1976 Nuclear Engineering and Technology Vol.8 No.1
For tile rapid production of fluorine-18 for medical use, the up-to-date methods of separation such as the recoil separation, the alumina column chromatography, and the distillation are reviewed. The amount of the residue, the gamma emitting impurity, and the tritium content in the product obtained by each separation method are determined. The product obtained by the nuclear recoil separation or by the alumina column chromatography is inferior to that obtained by the distillation in the purity point of view. Thus, the separation by the distillation is tile most effective especially in the case of using a natural lithium carbonate target. Carrier free fluorine-18 of about 2 mCi can routinely be produced by irradiating 7g of the natural lithium carbonate under the neutron flux of about 1$\times$10$^{13}$ n/$\textrm{cm}^2$/sec for 3 hrs, and subsequent separation by the distillation. The over-all processing time is 35-40n1in.
A Study on the Preparation of Tritium Luminous Compound
Kim, Jaerok Korean Nuclear Society 1972 Nuclear Engineering and Technology Vol.4 No.4
For the syntheses of tritium labelled polystyrene, the basic material for the preparation of tritium luminous compound, various methods of labelling such as Tesla discharge, Wilzbach exposure, gamma irradiation, and U V. irradiation were compared in view of getting high specific activity-product. The obtained polystyrene-T(G) by the method of Tesla discharge and by the method of U. V. irradiation had specific activity of 1~1.2 mCi/mg, and these two methods were the most encouraging. Mixing of 1 part of polystyrene-T(G) with 4 parts of ZnS:Cu phosphor, in weight, appeared to be the most suitable ratio in tile preparation of luminous compound in luminosity point of view. When 30 mg. of obtained luminescent mixture was applied on steel plate by using 1 ml. of the selected binder (i.e., 1g of commercial varnish in 100m1. of benzene) the luminosity maximum was ca. 20 micro Lambert. The prepared luminous compound was confirmed to be practically applicable for mine marker or dark-room light source.
A Study on the Preparation of Wood-Plastic Combinations (IV)
Kim, Jaerok,Lee, Kyung-Hee,Pyun, Hyung-Chick Korean Nuclear Society 1973 Nuclear Engineering and Technology Vol.5 No.1
Some physical and chemical properties of wood-plastic combinations(W.P.C.) made of domestic soft woods such as pinus densiflora, pinus rigida and poplus deltoides were measured. The rates of improvement in properties were roughly proportional to the contents of polymer or polymer mixtures in W.P.C. For the W.P.C. obtained by means radiation curing and containing 80% of polymer or polymer mixture, the hardness and water absorptirity were improved 2.2 times and 4 times those of the original wood, respectively. The improvement of hardness was especially remarkable in the W.P.C. made of pinus densiflora and polystyrene(120%) to show 7 times increased hardness. For the W.P.C. obtained by means of thermal curing and containing 80% of polymer or polymer mixture, the hardness and water absorptivity were improved 2.4 times and 3.4 times those of the non-treated woods, respectively. These data indicate that the properties of W.P.C. prepared by means of radiation curing are not much different from those of W. p. C. prepared by means of thermal curing. Both of acid resistancy and alkali resistancy of the W.P.C. were also improved remarkably in comparison with the non-treated wood.
Kim, Jaerok Korean Nuclear Society 1971 Nuclear Engineering and Technology Vol.3 No.3
In iodine-131 labelling of iodocompounds such as tetrachloro-P-tetraiodo R-fluorescein, sodium orthoiodohippurate and a non-iodocompound, human serum albumin (HSA), the labelling rates and yields are accurately compared with each other. The reaction systems conducted for each compounds were different conditions: sodium iodide-$^{131}$ I containing reducing agent, sodium iodide-$^{131}$ I free from reducing agent, and sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I etc. The labelling yields were generally poor; 10% in the case of using sodium iodide-$^{131}$ I containing redoing agent, and 50~60% in the case of using sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I. However, fair yields were obtained in the case of using sodium iodide-$^{131}$ I free from reducing agent and mostly in the form of iodide-$^{131}$ I. The reaction entities involved in these reactions are also briefly discussed.