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Enhanced Biodegradation of Waste Poly (Ethylene Terephthalate) Exploiting Carboxylesterases Complex
Dong-Hyeok HWANG,Myeong-Eun LEE,Byeong-Hyeon CHO,Jun Won OH,Seung Kyou YOU,Young Jin KO,Sung Ok HAN 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Polyethylene terephthalate (PET) triggers environmental issues since it is hard to degrade due to its recalcitrant and hydrophobic properties. In this study, we suggest a novel PET degrading complex that possesses improved stability and binding ability toward PET for continuous degradation of PET. The complex is composed of PETase, lipase B (CALB), and mini cellulosome (mCbpA). First, the mode of reaction toward PET and bis(2-hydroxyethyl) terephthalate (BHET) by single enzymes confirmed that the PETase produced intermediate containing BHET and mono (2-hydroxyethyl terephthalate) (MHET), but CALB produced terephthalate (TPA). These results demonstrated that there are two enzymes available for sequential degradation. Second, the complex containing the carbohydrate binding module (CBM) showed 68% enhanced binding ability towards PET. Third, the enzymatic degradation of PET is a prolonged process. Afterwards, we observed long-term stability at 30℃ using BHET and confirmed the improvement in stability. Lastly, it was confirmed that the PET weight was decreased to 0.005g and 0.039mM of TPA was accumulated. This result showed approx. 4.5-fold of improvement compared to control. Taken together, this complex enhancing long-term enzymatic stability and binding affinity would be versatile to produce reusable TPA, upcycling, and reducing waste plastic in industry and environment.
Original Article : Long-Term Outcome of Cystic Lesions in the Pancreas: A Retrospective Cohort Study
( Dong Won Ahn ),( Sang Hyub Lee ),( Jai Hwan Kim ),( Won Jae Yoon ),( Jin Hyeok Hwang ),( Jin Young Jang ),( Ji Kon Ryu ),( Yong Tae Kim ),( Sun Whe Kim ),( Yong Bum Yoon ) The Editorial Office of Gut and Liver 2012 Gut and Liver Vol.6 No.4
Background/Aims: The management guidelines for cystic lesions of the pancreas (CLPs) are not yet well established. This study was performed to document the long-term clinical outcome of CLPs and provide guidelines for the management and surveillance of CLPs. Methods: In this retrospective cohort study, an additional follow-up was performed in 112 patients with CLPs enrolled from 1998 to 2004 during a previous study. Results: During follow-up for the median period of 72.3 months, the size of the CLPs increased in 18 patients (16.1%). Six of these patients experienced growth of their CLPs after 5 years of follow-up. Twenty-six patients underwent surgery during follow-up, and four malignant cysts were detected. The overall rate of malignant progression during follow-up was 3.6%. The presence of mural nodules or solid components was independently associated with the presence of malignant CLPs. Seven patients underwent surgery after 5 years of follow-up. The pathologic findings revealed malignancies in two patients. There was only one pancreas-related death during follow-up. Conclusions: The majority of CLPs exhibit indolent behavior and are associated with a favorable prognosis. However, long-term surveillance for more than 5 years should be performed because of the potential for growth and malignant transformation in CLPs. (Gut Liver 2012;6:493-500)
( Dong Won Ahn ),( Young Soo Park ),( Sang Hyub Lee ),( Cheol Min Shin ),( Jin Hyeok Hwang ),( Jin Wook Kim ),( Sook Hyang Jeong ),( Nayoung Kim ),( Dong Ho Lee ) 대한내과학회 2016 The Korean Journal of Internal Medicine Vol.31 No.3
Background/Aims: This study was performed to investigate the clinical role of urgent esophagogastroduodenoscopy (EGD) for acute nonvariceal upper gastrointestinal bleeding (ANVUGIB) performed by experienced endoscopists after hours. Methods: A retrospective analysis was performed for consecutively collected data of patients with ANVUGIB between January 2009 and December 2010. Results: A total of 158 patients visited the emergency unit for ANVUGIB after hours. Among them, 60 underwent urgent EGD (within 8 hours) and 98 underwent early EGD (8 to 24 hours) by experienced endoscopists. The frequencies of hemodynamic instability, fresh blood aspirate on the nasogastric tube, and highrisk endoscopic findings were significantly higher in the urgent EGD group. Primary hemostasis was achieved in all except two patients. There were nine cases of recurrent bleeding, and 30-day mortality occurred in three patients. There were no significant differences between the two groups in primary hemostasis, recurrent bleeding, and 30-day mortality. In a multiple linear regression analysis, urgent EGD significantly reduced the hospital stay compared with early EGD. In patients with a high clinical Rockall score (more than 3), urgent EGD tended to decrease the hospital stay, although this was not statistically significant (7.7 days vs. 12.0 days, p > 0.05). Conclusions: Urgent EGD after hours by experienced endoscopists had an excellent endoscopic success rate. However, clinical outcomes were not significantly different between the urgent and early EGD groups.
Optimal hole extraction performance in MoOx-incorporated PEDOT:PSS films for organic photovoltaics
Hwang Tae-Ha,Gwak Donghoon,Cho Joonghyun,Bae Inho,Choi Jin Woo,Oh Dong Gun,Yang Si Hyeok,Kim Hongki,Kim Chang-Hyun 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.5
We propose a hole extraction system based on the metal-like poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) blended with MoOx. Tuning the volume ratio of MoOx to PEDOT:PSS, the conductivity increases ten times, compared to that of pristine PEDOT:PSS flm. The efcient charge recombination and generation characteristics between MoOx with PEDOT:PSS are argued as the increase. No additional absorption peak due to the charge transfer in the hole transport layer implies that the system does not follow the P-type doping technique. The use of MoOx-mixed PEDOT:PSS thin flm as the hole extraction layer for the poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b;4,5-b’]dithiophene-2,6- diyl-alt-[4-(2-ethylhexyl)-3-fuorothieno[3,4-b]thiophene]-2-carboxylate-2-6-diyl} (PTB7-Th) and [6,6]-phenyl C70-butyric acid methyl ester (PC[70]BM)-based organic solar cells is found to increase the short circuit current density and fll factor of the device concomitant, and the power conversion efciency increases from 6.7 to 8.1% when the MoOx mixing ratio is 3%. The improved hole extraction performance of MoOx-mixed PEDOT:PSS thin flm would be benefcial for potential applications in organic electronic devices.
Cerebral Toxoplasmosis Combined with Disseminated Tuberculosis
Hwang, Eui-Ho,Ahn, Poong-Gi,Lee, Dong-Min,Kim, Hyeok-Su The Korean Neurosurgical Society 2012 Journal of Korean neurosurgical society Vol.51 No.5
A 24-year-old man presented with mental change, fever, abdominal pain, tenderness and palpable mass on the lower abdomen. He was a non-Korean engineer and did not accompany a legal guardian, so medical history taking was difficult due to his mental status. Brain magnetic resonance imaging showed multiple rim-enhanced lesions of the brain, and abdominal computed tomography showed huge paraspinal abscess. Chest X-ray and computed tomography showed poorly defined nodular opacities. We initially thought that this patient was infected with toxoplasmosis with typical cerebral image finding and immunoglobulin laboratory finding of cerebrospinal fluid and serum study. The abdominal abscess was confirmed as tuberculosis through the pathologic finding of caseous necrosis. We used anti-tuberculosis medication and anti-toxoplasmosis medication for almost 4 months, and then his clinical state and radiological findings were considerably improved.