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Mehmet Siddik Yildiz,Mehmet Emin Adin,Ahmet Dogan,Ibrahim Halil Koparan 대한위암학회 2016 Journal of gastric cancer Vol.16 No.1
Gastrointestinal stromal tumors (GISTs) are rare tumors of the gastrointestinal system and comprise only 1% to 3% of all gastrointestinal tract tumors, with the majority of them arising in the stomach. In this report, we present the unique findings of a case of gastroduodenal intussusception caused by an underlying gastric GIST and complicated with severe acute pancreatitis.
Yildiz, Mehmet Siddik,Dogan, Ahmet,Koparan, Ibrahim Halil,Adin, Mehmet Emin The Korean Gastric Cancer Association 2016 Journal of gastric cancer Vol.16 No.1
Gastrointestinal stromal tumors (GISTs) are rare tumors of the gastrointestinal system and comprise only 1% to 3% of all gastrointestinal tract tumors, with the majority of them arising in the stomach. In this report, we present the unique findings of a case of gastroduodenal intussusception caused by an underlying gastric GIST and complicated with severe acute pancreatitis.
Hydrolysis of Waste Cooking Oil in Sub-critical Water Condition
( Sufi Ullah Siddik Bhuyan ),( Taeha Kim ),( Ruri Lee ),( Myoungchul Shin ),( Kwanghyeon Song ),( Yongchan Seo ),( Younghwan Chu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol (MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃, 0.4<p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO<sub>2</sub> medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.
Md Sufi Ullah Siddik Bhuyan,Eun Hei Lee,Abul Hasnat MD Ashraful Alam,Soa Choi,Ruri Lee,Kwanghyeon Song,Yong Chan Seo 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.11
Subcritical hydrolysis followed by methyl estrification was used to produce bio-diesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90% fatty acid methyl esther (FAME) conversion was achieved by subcritical hydrolysis without using catalysts at 275℃ for 45 minutes. The highest conversion to linoleic acid (C18:2) was obtained at this condition. The higher content of free fatty acid (FFA) in waste cooking oil resulted in higher conversion to FAME. It was also observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO2 loading S-TiO2/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans-esterification of un-reacted TG, DG, and MG with methanol remained during the hydrolysis stage. The higher FAME conversion means the better quality bio-diesel.
( Md Sufi Ullah Siddik Bhuyan ),( Eun Hei Lee ),( Abul Hasnat Md Ashraful Alam ),( Soa Choi ),( Ruri Lee ),( Kwanghyeon Song ),( Yong Chan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 추계학술발표논문집 Vol.2015 No.-
Subcritical hydrolysis followed by methyl estrification was used to produce bio-diesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90% fatty acid methyl esther (FAME) conversion was achieved by subcritical hydrolysis without using catalysts at 275℃ for 45 minutes. The highest conversion to linoleic acid (C18:2) was obtained at this condition. The higher content of free fatty acid (FFA) in waste cooking oil resulted in higher conversion to FAME. It was also observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO<sub>2</sub> loading S-TiO<sub>2</sub>/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans-esterification of un-reacted TG, DG, and MG with methanol remained during the hydrolysis stage. The higher FAME conversion means the better quality bio-diesel.
( Md Sufi Ullah Siddik Bhuyan ),( Taeha Kim ),( Soa Choi ),( Ruri Lee ),( Kwanghyeon Song ),( Sunho Whang ),( Eunhee Lee ),( Younghwan Chu ),( Yongchan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.2
Subcritical hydrolysis followed by methyl estrification was useful for the production of biodiesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90 % FFA content was achieved by subcritical hydrolysis without using catalysts at 275℃, 45 min and linoleic acid (C18:2) composition observed the highest. The presence of the initial amount of free fatty acid (FFA) in waste cooking oil was accelerated the rate of reaction compared to the refined soybean oil. It is observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO<sub>2</sub> loading S-TiO<sub>2</sub>/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans esterification of un reacted TG, DG and MG with methanol remained during the hydrolysis stage. The higher FAME yield was obtained relatively at low reaction conditions that would be given high quality biodiesel.
Recent Progress on Branched-Chain Amino Acids in Obesity, Diabetes, and Beyond
Md Abu Bakkar Siddik,Andrew C. Shin 대한내분비학회 2019 Endocrinology and metabolism Vol.34 No.3
Branched-chain amino acids (BCAAs) are essential amino acids that are not synthesized in our body; thus, they need to be obtainedfrom food. They have shown to provide many physiological and metabolic benefits such as stimulation of pancreatic insulin secretion, milk production, adipogenesis, and enhanced immune function, among others, mainly mediated by mammalian target of rapamycin (mTOR) signaling pathway. After identified as a reliable marker of obesity and type 2 diabetes in recent years, an increasing number of studies have surfaced implicating BCAAs in the pathophysiology of other diseases such as cancers, cardiovasculardiseases, and even neurodegenerative disorders like Alzheimer’s disease. Here we discuss the most recent progress and review studies highlighting both correlational and potentially causative role of BCAAs in the development of these disorders. Although we arejust beginning to understand the intricate relationships between BCAAs and some of the most prevalent chronic diseases, currentfindings raise a possibility that they are linked by a similar putative mechanism.