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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 8, Issue 4 - Dec 1964
Volume 8, Issue 3 - Sep 1964
Volume 8, Issue 2 - Jun 1964
Volume 8, Issue 1 - Mar 1964
Selecting the target year
Synthesis of 5-bromouracil-
by Isotopic Exchange Method
Pyun, Hyung-Chick ; Kim, Jae-Rock ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 39~42
As the bromination method with
for the synthesis of 5-bromouracil-
gave products with considerable impurities, e. g. uracil etc. an attempt to produce pure one by isotopic exchange method was performed. Bromide-82 ion such as
undergoes no isotopic exchange with 5-bromouracil-Br. However, isotopic exchange between
, and between
and 5-bromouracil-Br were too fast to determine the rate. The result indicated that this method can be used in the production of pure 5-bromouracil-
. It was also found that the use of reducing agent to maintain
as bromide form was unnecessary on
production from reactor.
Mechanism of Quenching by Dimethylanilines in Liquid Scintillation Counting
Lee, Ik-Choon ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 43~46
Quenching constants, q, determined for N,N-dimethylanilines by liquid scintillation counting indicate that the quenching involves an energy transfer process to these compounds causing strong n-
interaction within the quencher molecule, which is then followed by an non-radiative degradation of the excitation energy to ground state.
Study on a Ridio Paper Partition Chromatography of Organic Halogen Compounds by a Neutron Irradiation. A Qualitative Approach
Kim, You-Sun ; Chae, Song-Cha ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 47~56
When a developed paper partition chromatogram was irradiated by means of the pneumatic tube system of the Korean research reactor (neutron flux: 1.5
sec.) the qualitative confirmation of the developed spot on the chromatogram was possible. In the case of an organic halogen compounds (chloro-acid, chloro-ester, iodide, and fluoride) the spot analysis was possible by the present method whereas the same spot could not give the distinct coloring with a common coloring reagents. Filterpaper thickness calibration and activity calibration induced by irradiation of the components of the filter paper, which were a source of erraneous interpretation of the spot, were searched and an average filterpaper calibration method and filter paper activity were improvised to obtain a good qualitative analysis of the spot. Finally the use and applicability of this method for the analysis identification of an organic halogen compound were evaluated. As the filter paper phase an ordinary phase (Whatmann #1, filter paper) and reversed phase (liquid paraffin impregnated) were used.
Study on the Spheroidizing Mechanism of Graphite in Cast Iron (II)
Choi, Hyung-Sup ; Park, Won-Koo ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 57~61
It was verified at Part Ⅰ of this investigation that there is a minimum wettability between molten iron and graphite, which was preliminarily coated with magnesium, and thus the spheroidization of graphite might have resulted from the lack of wettability between magnesium-adsorbed graphite and iron matrix. Being continued from the last work, the wettability between pure iron and graphite, coated with the various thickness of cerium, are measured at melting point of pure iron in vacuum and 200 mmHg argon gas atmosphere. The result indicates the presence of a minimum wettability at a critical thickness of cerium film as was proved in the case of magnesium. The experimental analysis shows that, the minimum wettability could be attributed entirely to a minimum work of adhesion between liquid iron and graphite at a critical concentration of cerium in the iron-graphite interface.
Quantitative Separation of Some Transition Metals by Cation Exchange Chromatography
Kim, Tong-Yup ; Cha, Ki-Won ; Park, Kee-Chae ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 62~64
The cation exchange chromatographic studies for the analysis of transition metals have been described. The quantitative separation of a mixture of Fe(Ⅲ), Cu(II), Zn(II), Ni(II), Cd(II), Co(II) and Mn(II) has been obtained by elution, through a 28cm column of the resin, Dowex 50
4 (100∼200 mesh), using 0.45 M
+0.05 M Na-tartrate solution as eluent, starting with the eluent of pH 3.5, followed stepwise by pH 4.0 and 4.5. A comparison between the calculated and the observed peak positions in the elution curve has been shown. The relative stability constants for tartrate complexes of some transition metals have been calculated by using distribution ratios obtained in this separation procedure.
The Significant Structures of Liquid Fluorine
Jhon, Mu-Shik ; Chang, Sei-Hun ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 65~67
The partition function of liquid fluorine were developed by applying the theory of significant structures in liquids. The molar volume, vapor pressure, entropy of vaporization and surface tension of the liquid were calculated over a wide temperature range. The critical properties for the liquid were also calculated. The results show good agreement with experimental observations.
Significant Structure of Liquid Water
Pak, Hyung-Suk ; Chang, Sei-Hun ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 68~74
Water has the melting point, the boiling point, the heat of fusion, and the heat of vaporization all much higher than would be normally expected from the hydrogen compounds of the other members of the oxygen family. Another unique characteristic of ice-Ⅰ is its volume decrease which takes place in its melting. A number of significant efforts have been made in the past to explain these properties quantitatively. The authors, reasoning from the unusually great free surface energy of water and the characteristic volume change on melting, propose the structural model of liquid water as follows. On melting, fluidized vacancies of a molecular size are introduced. Thereupon, for the unusually great surface energy density, molecules surrounding the vacancies become to have close packed arrangement. But molecules not in direct contact with vacancies should still possess the original structure i. e., ice-Ⅰ. When a molecule adjacent to a vacancy jumps into the vacancy, the molecule attains the gaslike degree of freedom. Using the above model, the authors had developed the liquid partition function of water by applying the theory of significant structures in liquids. Molar volume, vapor pressure, entropy of fusion and entropy of vaporization were calculated over a wide temperature range. The results show good agreement with experimental observations.
Studies on the Toxic Substances in Korean Barley Infected with Gibberella Zeae(I) Identification of the Toxicity of the Infected Grain by Animal Tests
Kim, Tae-Bong ; Hahn, Bo-Sup ; Hahn, Sang-Heyun ; Kee, Ryong-Suk ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 75~77
It was confirmed that korean scabby barley during the summer of 1963 was infected with Gibberella zeae. Feeding experiments showed that the diseased grain was toxic and induced emesis in pigs. The concentrated extracts which contained the emetic principle were prepared by refluxing the grain with methanol or water for 5 hours and then concentrating the filtrates and the washing in vacuum. Animal tests proved that methanol extraction for the emetic principle was more effective than extraction with water.
Studies on the Toxic Substances in Korean Barley Infected with Gibberella Zeae(II) Distribution of the Toxic Substance, Method of its Elimination and Some Detoxifying Agent
Kim, Tae-Bong ; Hahn, Bo-Sup ; Hahn, Sang-Heyun ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 78~81
In this report, some practical problems that are concerned with the infected barley were examined. Most of the toxic substance is present in the bran. It was almost impossible to remove the toxic substance with water or methanol completly, however, we found it is effectively eliminated by soaking the whole grain with 2%, calcium hydroxide suspension for 24 hours. As a detoxifying agent, kieselguhr was very effective; the grain mixed with little amounts (0.4-0.5%) of kieselguhr may be used as an animal feed.
Studies on the Toxic Substances in Korean Barley Infected with Gibberella Zeae(III) Relation of Choline and the Toxic Substnace in the Infected Grain
Kim, Tae-Bong ; Hahn, Bo-Sup ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 82~84
It has been pointed out that various substances such as "toxoalbumin", glycoside, choline or readily hydrolysable choline derivatives, alkaloid, lysolecithine etc. are associated with the toxicity of the infected grain. But animal tests and analysis of paper chromatography by author's indicated that a basic substance present in the concentrated extracts from the grain may neither be acetylcholine, betaine, nor choline. This problem still have to be examine further.
Spot Test for Amins Acids with Alloxan
Kim, Tae-Bong ; Hahn, Bo-Sup ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 85~87
In order to stabilze alloxan as a reagent for detection of amino acids by spot test, sugars and other reductants were added to the aqueous alloxan solution. It was found that lactose was the best for the purpose. The alloxan reagent containing lactose did not give color change on blank test and was very stable that there was no color change even it was allowed to stand in room temperature for several months. The color reaction with amino acids and some amines was not affected by lactose. This spot test for amino acids is in sensitivity as comparable to that of the previously reported methods and gave color reaction with proline and hydroxyproline to 1
An Improved Method for the Determination of Scandium by Neutron Activation Analysis
Chung, Koo-Soon ; Lee, Chul ;
Journal of the Korean Chemical Society, volume 8, issue 2, 1964, Pages 88~91
A rapid and simple method is described here for the determination of scandium in monazite by neutron activation analysis. The sample is irradiated for 20 hours at the neutron flux of
/sec in the TRIGA MARK Ⅱ reactor, after which the sample is decomposed by fusion with concentrated sulfuric acid. The scandium-46 together with scandium carrier are separated from the irradiated sample by precipitating with ammonia, and are extracted by solvent extraction of the thiocyanate complex into ether. The induced radioactivity is measured by gamma scintillation spectrometry using the Multichannel Pulse Height Analyzer connected with 2"
2" NaI(Tl). The chemical yield is determined gravimetrically by precipitating scandium with mandelic acid. In order to check the efficiency of scandium separation and the errors from interfering activities of the other elements, scandium was separated by the cation exchange resin column, and the results from both samples were compared each other, which showed that the chemical procedure used in this work was as selective as the ion-exchange method with respect to scandium separation. The scandium contents in Korean monazite were found to be about 12 p. p. m.