• Journal of the Korean Chemical Society
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• v.35 no.1
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• pp.16-23
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• 1991

Resins of polystyrene supported triethylenetetramine of linear and claw types have been prepared by the reaction of triethylenetetramine with chloromethylated polystyrene. The resin supported triethylenetetramines were principally characterized by infrared spectra. Kinetics of adsorption of transition metals on the resin have been investigated. This paper reports the results of the diffusion coefficients and entropies of activation. The rate determining step is a process of diffussion through the particle.

• Journal of The Korean Society of Inherited Metabolic disease
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• v.3 no.1
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• pp.22-27
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• 2003

고페닐알라닌혈증의 경우 모든 환자들이 저페닐알라닌 식이를 엄격히 지키는 것은 아니기 때문에 기대만큼의 치료효과를 거두지 못하는 경우가 종종 있다. 모든 페닐알라닌 수산화 효소 결핍에 의한 페닐케톤뇨증 환자에서 테트라하이드로바이오프테린의 복용이 효과를 거두는 것은 아니나 식이조절과 비교해 볼 때 이는 식이 제한에 대한 어려움이 없고 복용이 간편하므로 치료효과가 있다면 일부 환자에서라 하더라도 페닐케톤뇨증 환자의 치료에 새로운 방향을 제시하는데 충분한 의미가 있다고 본다. 이러한 시점에서 저자들은 고전적 페닐케톤뇨증으로 진단되었던 6명의 환아에서 식이제한없이, 또는 식이제한을 완화한 상태에서 테트라하이드로바이오프테린을 복용함으로써 치료 효과를 거둔 6례에 대해서 문헌 고찰과 함께 보고하는 바이다.

• Journal of Food Hygiene and Safety
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• v.34 no.3
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• pp.227-234
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• 2019

An analytical method was developed for the determination of oxytetracycline in agricultural products using the QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method by liquid chromatography-tandem mass spectrometry (LC-MS/MS). After the samples were extracted with methanol, the extracts were adjusted to pH 4 by formic acid and sodium chloride was added to remove water. Dispersive solid phase extraction (d-SPE) cleanup was carried out using $MgSO_4$ (anhydrous magnesium sulfate), PSA (primary secondary amine), $C_{18}$ (octadecyl) and GCB (graphitized carbon black). The analytes were quantified and confirmed with LC-MS/MS using ESI (electrospray ionization) in positive ion MRM (multiple reaction monitoring) mode. The matrix-matched calibration curves were constructed using six levels ($0.001{\sim}0.25{\mu}g/mL$) and coefficient of determination ($r^2$) was above 0.99. Recovery results at three concentrations (LOQ, $10{\times}LOQ$, and $50{\times}LOQ$, n=5) were from 80.0 to 108.2% with relative standard deviations (RSDs) less than of 11.4%. For inter-laboratory validation, the average recovery was in the range of 83.5~103.2% and the coefficient of variation (CV) was below 14.1%. All results satisfied the criteria ranges requested in the Codex guidelines (CAC/GL 40-1993, 2003) and the Food Safety Evaluation Department guidelines (2016). The proposed analytical method was accurate, effective and sensitive for oxytetracycline determination in agricultural commodities. This study could be useful for safety management of oxytetracycline residues in agricultural products.

• 대한치주과학회:학술대회논문집
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• 1999.11a
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• pp.81-81
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• 1999

• 대한치주과학회:학술대회논문집
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• 1999.11a
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• pp.48-48
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• 1999

• 대한치주과학회:학술대회논문집
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• 2001.12a
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• pp.98-98
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• 2001

• Digital Contents
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• no.6 s.121
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• pp.136-141
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• 2003

'테트리스'라는 게임을 모르는 사람이 있을까? 1980년대 후반 전자오락실을 평정했던 자타가 공인하는 최고의 킬링 타임용 게임이다. 테트리스의 게임 방식은 여러 가지 모형이 무작위로 나타나 위에서 아래로 떨어지고, 버튼을 누르면 회전해 모양이 바뀌고, 모형의 조합이 맞아떨어지면 소멸되는 기본 원칙은 신선한 충격이었다.

• 동물약계
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• no.56
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• pp.2.2-2.2
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• 1998

[ $\cdot$ ]가축질병 발생주의보 발령 $\cdot$염산 옥시테트라싸이클린 알선 오퍼상 선정 $\cdot$동물약품제조용 양허관세적용 품목 배정 신청 $\cdot$협회 제6차 이사회 개최

• Proceedings of the Korean Society of Veterinary Service Conference
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• 1997.05a
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• pp.247.2-248
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• 1997

• 대한치주과학회:학술대회논문집
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• 2000.11a
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• pp.139-140
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• 2000