Volume 15 Issue 1

  1. Cang Sae Hee;Kim Jae Soon;Huh Tae Soung 1
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    Forsythia koreana NAKAI 씨(토연교)를 methanol로 추출 분리정제하여 얻은 quaternary base의 염산염을 mass spectra, ultraviolet spectra, Infrared spectra, 원소분석, 정성실험으로 확인한 결과 Betaine 염산염 임이 확인되었다.
  2. Lee Chull;Chung Koo Soon 5
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    모나자이트 시료중의 토륨만을 신속히 정량하기 위하여 양이온 교환수지법을 사용한 분리법을 고안하였다. 희토류 원소를 포함한 모든 공존 이온을 3N 염산으로 용출제거하고 남아있는 토륨을 5N 황산으로 용출한 다음 토린을 착색제로 사용하여 광도 법을 써서 정량하였다. 방사성 동위원소 및 출광 분광법을 써서 용출된 토륨의 정량적인 회수 및 그의 화학적 순도를 확인하였다.
  3. Lee Hyun-Jae;Kim Soo Ja 11
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    A modified form of the integrated Michaelis-Menten equation would provide a useful means of evaluating enzyme kinetic parameters in nonlinear progress reaction with time. A slight modification of the Lineweaver-Burk form (and other variants) using for the velocity, the change in substrate concentration divided by time ($\={v}$), and for the velocity, the change in substrate for the time interval ($\={S}$), allows this linear reciprocal form to be used with negligible error even when as much as half of the substrate is utilized during the time interval.
  4. Cho Kyung Yeon;Kim Duck Chan;Kim Yong Joon 15
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    DL-1-Amino-pentyl phosphonic acid, DL-1-Aminopropyl phosphonic acid were synthesized with good yield from caproic acid and butyric acid using the modified Curtius reaction and N-derivatives, N-acetyl-DL-1-amino propyl phosphonic acid, N-acetyl-DL-1-aminopentyl phosphonic acid, N-Benzoyl-DL-1-amino-propyl phosphonic acid, were also prepared by a variety of methods including the Schotten-Baumann reaction. In addition, the chemical and physical properties of the products were investigated. All the products were also identified by means of elemental analysis, Infrared spectrophotometry, Ninhydrin test, and the determination of the neuralization equivalent.
  5. B. RHEE 23
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    Bislang konnte der Hochregenerativpyrokohlenstoff nur bei hohen Abscheidungstemperaturenvon $2100^{\circ}C-2200^{\circ}C$ hergestellt werden. Daher versuchte es in der vorliegenden Arbeit, ihn bei niedrigeren Abscheidungsternperaturen herzustellen und wurde gefunden, da$\ss$ der Hochregenerativpyrokohlenstoff auch bei der Abscheidungsternperaturen von $1700^{\circ}C$ hergestellt werden kann. Methan wurde in einem nach der Hei$\ss$wandmethode erhitzte Str$\"{o}$mungsrohrreaktor zersetzt und als Substratmaterial wurden gesintertes Aluminiumoxidrohr und impr$\"{a}$gniertes Graphitrohr verwendet. Die senkrechte Stellung der Versuchsanlage erwies sich als g$\"{\u}$nstiger als die waagrechte Stellung derVersuchsanlage. Eigenschaften wie Dichte, R$\"{o}$ntgen feinstrukturparameter und Zugfestigkeit des in der vorliegenden Arbeit hergestellten Hochregenerativpyrokohlenstoffes wurden mit den anderen Pyrokohlenstoffsorten sowie mit den Literaturwerten f$\"{u}$r den Hochregenerativpyrokohlenstoff vergleichend untersucht.
  6. Hong Sun-Joo;L. H. Piette 37
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    The reaction of amino acids and the reactive hydroxyl radical generated by $Ti^{3+}-H_2O_2$ system was studied using fast flow techniques coupled with ESR. Upon adding methionine to the 0.2M $H_2O_2$ solution (0.05M methionine after addition) and mixing with 0.01M $TiCl_3$, the low field component of the two incompletely resolved peaks, in the spectrum of $Ti^{3+}-H_2O_2$ system alone, vanished completely whereas the high field component remained almost constant and superimposed on the secondary spectrum of the methionine free radical. Similar results were obtained for other amino acids and proteins. The results strongly demonstrate that the $T^{3+}-H_2O_2$ flow system generates two different radical species, only one of which, giving rise to the low field component, is alone responsible for abstracting hydrogen atoms from substrate molecules. The effects of HCl, $H_2SO_4$ and NaOH on the system were also studied with widely varying results.