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Multiple Endocrine Neoplasia 2A Detected by Peptic Ulcer Perforation with Hypercalcemia
장명철 대한갑상선학회 2022 International Journal of Thyroidology Vol.15 No.2
Multiple endocrine neoplasia type 2A is autosomal dominantly inherited disease with RET oncogene mutation. Hyperparathyroidism occurs less frequently and severe hyperparathyroidism is rare in multiple endocrine neoplasia type 2A. We experienced a case of 38-year-old man with peptic ulcer perforation and hypercalcemia who was diagnosed as multiple neoplasia type 2A. Although peptic ulcer disease with hypercalcemia is very rare in MEN 2A, clinical suspicion of multiple endocrine neoplasia and germline mutational test would be important for accurate diagnosis and treatment.
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Modification of Hydroxyapatite-gelatin Nanocomposite using Side Group Reaction of Ca2+-RCOO-
장명철,양해권 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.1
In the preparation of a hydroxyapatite [HAp]/gelatin [GEL] nanocomposite, the GEL matrix in aqueous solution of H3PO4 was modified by the introduction of aspartic acid [Asp], asparagine [Asn], and glycine [Gly]. The addition of Asp, Asn and Gly greatly affected the slurry formation of HAp/GEL nanocomposite and the resulting dry body showed variations in toughness with the addition of the different amino acids. The introduction of Asn into HAp/GEL nanocomposite was effective for producing the organic-inorganic interaction between HAp and GEL, and caused the increase of toughness. The formation reaction of the modified HAP/GEL nanocomposites was investigated by using XRD and FT-IR. The organic-organic interaction between the GEL matrix and the additives of Asp, Asn and Gly was confirmed from FT-IR analysis, and the organic-inorganic interaction between HAp nanocrystallites and the modified GEL matrix was also discussed, using FT-IR spectra patterns. Nanocrystallites of HAp were covalently bound with the GEL macromolecules and differently influenced by the modification species of Asp, Asn, and Gly.
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Precipitation of Calcium Phosphate at pH 5.0 for the β Tri-calcium Phosphate Cement
장명철 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.4
The purpose of this study was to prepare calcium phosphate cement [CPC] for use in artificial bone. Nano-crystalline calcium phosphate [CaP] was precipitated at 37oC using highly active Ca(OH)2 in DI water and an aqueous solution of H3PO4. From the XRD measurements, the nano-CaP powder was close to apatitic TCP phase and the powders fired at 800oC showed a critical β-TCP phase. A mixture of one mole CaCO3 and two moles di-calcium phosphate was calcined at 1100oC to make a reference β-TCP material. The nano-CaP powders were added to the normal β-TCP matrix and fired at 900oC to make a β-TCP block. The sintered block showed improved mechanical strength, which was caused by the solid state interaction between nano-CaP and normal β-TCP.
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Yttrium-Stabilized Zirconia Particles Prepared Using Electro-dialysis of (Zr,Y)OCl2 Aqueous Solution
장명철 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
Hydrous zirconia particles were prepared from ZrOCl2aqueous solution using an electro-dialysis [ED] process. For the preparationof (Zr,Y)(OH)4 precipitates, 3 mol% YCl3 was added into ZrOCl2aqueous solution. During the hydrolysis of 0.5 mol/L(Zr,Y)OCl2 solution at 90oC a slurry solution was obtained. The ED process was used for the removal of chlorine from the slurrysolution. Two kinds of slurry solution were sampled at the beginning and end of the ED process. The morphology of hydrous zirconiaparticles in the solution was observed using an inverted optical microscope and an FE-SEM. The hydrous zirconia particleswere nano-crystalline, and easily coagulated with drying. Yttrium stabilized zirconia [YSZ] powder could be obtained by the calcinationof (Zr,Y)(OH)4 precipitates prepared from a (Zr,Y)OCl2 solution by the ED process. The coagulated dry powders wereshaped and sintered at 1500oC for 2 h. The sintered body showed a dense microstructure with uniform grain morphology.
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Hydroxyapatite-collagen 나노복합재료에서의 불균질 핵생성
장명철 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.11
공침법을 이용하여 수산화아파타이트[HAP]-콜라겐[COL] 나노복합재료를 제조하였다. HAP 결정과 COL 분자 사이의 화학결합형성을 확산반사법 FT-IR 및 투과전자현미경(TEM) 관찰로부터 확인하였다. 제조 시에 첨가되는 콜라겐 단백질의 농도가 높으면 미세한 아파타이트 나노결정의 콜라겐 복합체가 만들어지고 첨가되는 단백질의 농도가 낮으면 아파타이트 결정이 비교적 크게 발달하였다. FT-IR과 전자선 회절(electron diffraction)로부터 콜라겐 매체에 발달된 아파타이트 결정입자 들은 콜라겐 분자의 c 축을 따라 정렬하는 것임을 알 수 있었다. 칼슘이온 농도와 인산이온 농도를 일정하게 유지하는 수용액 계에 용해되어 있는 콜라겐 단백질의 농도는 아파타이트 결정의 발달을 위한 불균질 핵생성 위치를 제공하는 중요한 역할을 하고 있다. 콜라겐의 농도가 높으면 칼슘이온(Ca$^{2+}$)에 대한 핵생성을 위한 활성화 위치를 많이 제공하게 되며, 이는 핵생성 위치에 대한 칼슘이온 농도가 상대적으로 낮아지는 것에 대응하게 된다. Hydroxyapatite[COL] nanocomposite was prepared through coprecipitation process. The chemical bond formation between HAP and COL was confirmed by diffusive reflectance FT-IR and TEM observation. Higher concentration of COL in the preparation induced tiny nanocrystalline composite particles, but lower concentration of COL contributed to form the well developed HAP particles. From TEM observation and ED(Electron Diffraction) pattern the embedded HAP nanoparticles were oriented along the c-axis of COL fiber. In an aqueous system of constant [Ca$\^$2+/] and [PO$_4$$\^$3-/], quantity of soluble COL matrix was doing an important role of controlling the heterogeneous nucleation site for the formation of HAP nanocrystals. Higher concentration of COL will provide more nucleation sites for Ca$\^$2+/ and so the concentration of calcium ions for the total number of active nucleation sites will be getting relatively dilute.
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Molecular Orbital Calculation on the Configuration of Hydroxyl Group in Hexagonal Hydroxyapatite
장명철 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
The possible configurations of hydroxyl group in hexagonal hydroxyapatite were identified through molecular orbital calculation. The molecular orbital interaction between O and H in hydroxyl column was analyzed using charge variation and bond overlap population (BOP). We supposed 5 kinds of O-H bond configurations as cluster types of I, II, III, IV and V. Mullikens population analysis was applied to evaluate ionic charges of O, H , P and Ca ions, and BOPs (Bond Overlap Populations) in order to discuss the bond strength change by the atomic arrangement. The stability of each O-H bond configuration was analyzed using bond overlap and ionic charge.
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장명철,김찬동,노혜린,채기봉,박원서,민동원,신형식,양대현,최원진 대한외과학회 2003 Annals of Surgical Treatment and Research Vol.65 No.4
A medullary carcinoma of the breast is an uncommon breast cancer subtype, but has a fair prognosis. The histopathological criteria for a medullary carcinoma were delineated by Ridolfi et al. in 1977, and most pathologists use these criteria. The authors experienced a huge carcinoma of the breast, which was diagnosed as an atypical medullary carcinoma. A 47-year old female visited our clinic due to a breast mass of six months duration. The mass was 16 cm in size and exophytic in the left lower breast. There had been necrosis, with a foul odor in most of the mass. A large fixed axillary lymph node was noted, but there was no evidence of distant metastasis. A radical mastectomy was performed due to invasion of the pectoralis major. On pathological examination, the tumor was diagnosed as an atypical medullary carcinoma. (J Korean Surg Soc 2003;65:353-355)
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