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Yi YS, Kim SS, Kim WJ, Bae MJ, Kang JH, Choi BG, Jeon YK, Kim BH, Lee BJ, Wang SG, Kim IJ, Kim YK. Comparison of two- and three-dimensional sonography for the prediction of the extrathyroidal extension of papillary thyroid carcinomas. Korean J Intern Med 2016; 31:313-22. [PMID: 26701230 PMCID: PMC4773718 DOI: 10.3904/kjim.2014.363] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 03/24/2015] [Accepted: 05/13/2015] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND/AIMS The purpose of this study was to compare the diagnostic validity of two-dimensional (2D) and three-dimensional (3D) ultrasonography (US) when predicting the extrathyroidal extension of papillary thyroid cancer. METHODS All 2D data were interpreted in real time and 3D data were stored, rendered using tomographic ultrasound imaging (TUI), and then reviewed retrospectively. RESULTS Extrathyroidal extension was present in 17 papillary thyroid cancers(24.3%) on pathology reports. The presence of contact was significantly associated with extrathyroidal extension on both 2D and 3D US (p = 0.007 and p = 0.003), and the sensitivity and specificity were not significantly different between 2D and 3D US (p = 1.000 and p = 0.754). The coexistence of protrusion and contact was not significantly associated with extrathyroidal extension on either 2D or 3D sonogram. CONCLUSIONS Three-dimensional images rendered with TUI algorithms alone do not seem to be markedly superior to real-time 2D US in predicting the extrathyroidal extension of papillary thyroid cancer.
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Affiliation(s)
- Yang Seon Yi
- Department of Internal Medicine, Busan Veterans Hospital, Busan, Korea
| | - Sang Soo Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Won Jin Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Min Jung Bae
- Department of Internal Medicine, Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | - Ji Hyun Kang
- Department of Internal Medicine, Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | - Bo Gwang Choi
- Department of Internal Medicine, Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | - Yun Kyung Jeon
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Bo Hyun Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Byung Joo Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University Hospital, Busan, Korea
| | - Soo Geun Wang
- Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University Hospital, Busan, Korea
| | - In Joo Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
- Correspondence to In Joo Kim, M.D. Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, 179 Gudeokro, Seo-gu, Busan 49241, Korea Tel: +82-51-240-7224 Fax: +82-51-254-3127 E-mail:
| | - Yong Ki Kim
- Department of Internal Medicine, Kim Yong Ki Internal Medicine Clinic, Busan, Korea
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Bae MJ, Kim SS, Kim WJ, Yi YS, Jeon YK, Kim BH, Lee BJ, Lee JC, Kim IJ, Wang SG, Kim YK. High prevalence of papillary thyroid cancer in Korean women with insulin resistance. Head Neck 2015; 38:66-71. [PMID: 25196854 DOI: 10.1002/hed.23848] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2014] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The purpose of this study was to determine if hyperinsulinemia and/or insulin resistance are/is associated with the prevalence of papillary thyroid cancer (PTC) in Korean women. METHODS This study included 735 female patients with PTC and 537 female non-PTC control subjects. Multiple logistic regression analysis was performed to evaluate the associations between hyperinsulinemia/insulin resistance and the occurrence of PTC. RESULTS The prevalence of PTC was significantly correlated with increased insulin, glucose levels, and a high homeostasis model of assessment-insulin resistance (HOMA-IR). The multivariate adjusted odds ratios for the prevalence of PTC in the highest quartile groups for insulin, glucose, and HOMA-IR were 2.88, 9.32, and 4.07 (all p < .001), respectively, compared with the lowest quartile groups. Pathological analyses revealed that increased serum glucose, insulin levels, and a higher HOMA-IR were associated with the multifocality of PTC. CONCLUSION Hyperinsulinemia and/or insulin resistance may be associated with the development of PTC, but not disease severity in Korean women.
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Affiliation(s)
- Min Jung Bae
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | - Sang Soo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Won Jin Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Yang Seon Yi
- Department of Internal Medicine, Busan Veterans Hospital, Busan, Korea
| | - Yun Kyung Jeon
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Bo Hyun Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Byung Joo Lee
- Department of Otolaryngology, Pusan National University Hospital, Busan, Korea
| | - Jin Choon Lee
- Department of Otolaryngology, Pusan National University Hospital, Busan, Korea
| | - In Joo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.,Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Soo Geun Wang
- Department of Otolaryngology, Pusan National University Hospital, Busan, Korea
| | - Yong Ki Kim
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
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Kim WJ, Kim SS, Lee HC, Song SH, Bae MJ, Yi YS, Jeon YK, Kim BH, Kim YK, Kim IJ. Association between Serum Fibroblast Growth Factor 21 and Coronary Artery Disease in Patients with Type 2 Diabetes. J Korean Med Sci 2015; 30:586-90. [PMID: 25931789 PMCID: PMC4414642 DOI: 10.3346/jkms.2015.30.5.586] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 12/12/2014] [Indexed: 01/06/2023] Open
Abstract
The aim of this study was to evaluate the association of plasma fibroblast growth factor (FGF)-21 with angiographically significant coronary artery disease (CAD) in patients with type 2 diabetes mellitus. Serum FGF-21 was measured in 120 patients undergoing coronary angiography. Patients were divided into 4 groups based on the presence/absence of type 2 diabetes mellitus and of significant CAD. The atherosclerotic burden was obtained by two angiographic scores: Gensini score (GS) and Extent score (ES). FGF-21 levels were higher in type 2 diabetes mellitus than in non-diabetic patients (P = 0.014). FGF-21 levels were significantly correlated with GS (r = 0.358, P < 0.001) and ES (r = 0.324, P < 0.001) in univariate analysis with all patients. After adjusting for several confounding factors, both GS and ES were associated with FGF-21 in all patients (r = 0.271, P = 0.014; r = 0.217, P = 0.041, respectively). However, FGF-21 lost significant correlation with both GS and ES with type 2 diabetes mellitus in the final model. The patients with type 2 diabetes mellitus and CAD feature had elevated FGF-21 levels. Despite of a limited role in diabetic patients, FGF-21 levels are independently associated with angiographic severity and extent of CAD.
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Affiliation(s)
- Won Jin Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Sang Soo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Han Cheol Lee
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Sang Heon Song
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Min Jung Bae
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | | | - Yun Kyung Jeon
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Bo Hyun Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Yong Ki Kim
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | - In Joo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
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Kim WJ, Kim SS, Bae MJ, Yi YS, Jeon YK, Kim BH, Song SH, Kim IJ, Kim YK. High-normal serum uric acid predicts the development of chronic kidney disease in patients with type 2 diabetes mellitus and preserved kidney function. J Diabetes Complications 2014; 28:130-4. [PMID: 24438886 DOI: 10.1016/j.jdiacomp.2013.11.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 11/12/2013] [Accepted: 11/13/2013] [Indexed: 02/06/2023]
Abstract
AIMS We evaluated whether high-normal serum uric acid (SUA) levels can predict the development of chronic kidney disease (CKD) in patients with type 2 diabetes mellitus and preserved kidney function at baseline. METHODS This was a retrospective observational longitudinal study of patients presenting at the Department of Endocrinology and Metabolism, Pusan National University Hospital. A total of 512 patients with type 2 diabetes mellitus and preserved kidney function (estimated glomerular filtration rate [eGFR] ≥ 60 mL/min/1.73 m(2)) and normouricemia were included. The main outcome was development of CKD of stage 3 or greater. The patients were divided into four groups according to quartiles of SUA levels. RESULTS During the follow-up period, 62 (12.1%) patients had progressed to CKD 3 or greater. The group with the highest-normal range of SUA (Q4) showed a higher cumulative incidence of CKD stage 3 or greater than that of the other lower quartiles (Q4 vs. Q3; P = 0.037, Q4 vs. Q2; P<0.001, Q4 vs. Q1; P<0.001). In a univariate analysis, Q4 was significantly associated with the development of CKD 3 or greater (log-rank statistic, 31.93; P<0.001). In a multivariate analysis, Q4 (hazard ratio, 2.97; 95% confidence interval, 1.15-7.71; P = 0.025) showed a significant association with CKD 3 or greater. CONCLUSIONS High-normal SUA may predict the occurrence of CKD stage 3 or greater in patients with type 2 diabetes mellitus and preserved kidney function.
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Affiliation(s)
- Won Jin Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Sang Soo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Min Jung Bae
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
| | | | - Yun Kyung Jeon
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Bo Hyun Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Sang Heon Song
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - In Joo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Korea; Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
| | - Yong Ki Kim
- Kim Yong Ki Internal Medicine Clinic, Busan, Korea
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Lee SH, Kim BH, Bae MJ, Yi YS, Kim WJ, Jeon YK, Kim SS, Kim YK, Kim IJ. Concurrence of primary hyperparathyroidism and metastatic breast carcinoma affected a parathyroid gland. J Clin Endocrinol Metab 2013; 98:3127-30. [PMID: 23750035 DOI: 10.1210/jc.2013-1227] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Involvement of the parathyroid glands by metastatic tumor is rare. Breast is 1 of the primary sites in metastatic cancers. We introduce a rare case of metastatic breast carcinoma affecting a parathyroid gland, which was clinically combined with parathyroid gland hyperplasia. CASE REPORT A 65-year-old woman was referred due to hypercalcemia and constipation. The patient had a history of left breast carcinoma. She was admitted to the hospital because of the recent discovery of hypercalcemia and elevation of PTH. A Tc99m-sestamibi scan showed retained uptake in the right thyroid and in the lower pole of the left thyroid gland. Aspiration biopsy results revealed that the nodule in the posterior portion of the right thyroid was metastatic breast cancer and the nodule in the left thyroid gland was the hyperplastic parathyroid gland. CONCLUSION This case illustrates that hyperparathyroidism caused by parathyroid hyperplasia was concurrent with metastatic breast cancer to a parathyroid gland without disseminated systemic metastasis. Although this case is very uncommon and it is not clear whether there is a relationship between breast cancer and primary hyperparathyroidism, that possibility should always be considered as the cause of hypercalcemia in patients with breast cancer.
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Affiliation(s)
- Sang Hee Lee
- Department of Internal Medicine, Pusan National University College of Medicine, Busan 602-739, Korea
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Affiliation(s)
- Won Jin Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Min Jung Bae
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Yang Seon Yi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
| | - Yun Kyung Jeon
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Sang Soo Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Bo Hyun Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - In Joo Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea
- Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
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Choi MK, Kim GH, Song GA, Nam HS, Yi YS, Ahn KH, Kim S, Kim JY, Park DY. Primary squamous cell carcinoma of the liver initially presenting with pseudoachalasia. Gut Liver 2012; 6:275-9. [PMID: 22570760 PMCID: PMC3343169 DOI: 10.5009/gnl.2012.6.2.275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2010] [Revised: 10/29/2010] [Accepted: 11/11/2010] [Indexed: 12/23/2022] Open
Abstract
Pseudoachalasia secondary to primary squamous cell carcinoma (SCC) of the liver is extremely rare and has not been reported until now. Here, we report a unique case of primary SCC of the liver initially presenting with progressive dysphagia along with short periods of significant weight loss. A 58-year-old man initially presented with progressive dysphagia along with significant weight loss over brief periods of time. The radiographic and manometric findings were consistent with achalasia. Subsequent esophagogastroduodenoscopy revealed a moderately dilated esophagus without evidence of neoplasm or organic obstruction. However, firm resistance was encountered while traversing the esophagogastric junction (EGJ), although no mucosal lesion was identified. Due to the clinical suspicion of the presence of a malignant tumor, endoscopic ultrasonography (EUS) and computed tomography scans of the chest and abdomen were obtained. A huge hepatic mass with irregular margins extending to the EGJ was found. EUS-guided fine-needle aspiration was performed, and the mass was diagnosed as a primary SCC of the liver by immunohistochemical staining.
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Affiliation(s)
- Mun Ki Choi
- Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
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Nam HS, Kim GH, Kim DU, Choi MK, Yi YS, Hwang JM, Kim S. [A case of duodenal perforation caused by biliary plastic stent treated with approximation using endoclip and detachable snare]. Korean J Gastroenterol 2011; 57:129-33. [PMID: 21350325 DOI: 10.4166/kjg.2011.57.2.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Endoscopic retrograde biliary drainage (ERBD) is useful for the palliative decompression of biliary obstruction. However, the complications of ERBD include cholangitis, hemorrhage, acute pancreatitis, obstruction of the stent, and duodenal perforation. Pressure necrosis on the duodenal mucosa by the stent may contribute to perforation. Although duodenal perforation following ERBD is very rare compared to other complications, it can result in a fatal outcome. Recent reports describe nonsurgical treatment for small gastrointestinal perforation with localized peritonitis and suggest that endoclipping may be appropriate in the management of a well selected group of patients with iatrogenic perforation. We describe a case of duodenal perforation secondary to ERBD that was successfully treated with approximating using endoclip and detachable snare.
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Affiliation(s)
- Hyung Seok Nam
- Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
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Lee JW, Lee HW, Kim SW, Lee SY, Park YK, Han JH, Choi SI, Yi YS, Yun Z. Nitrogen removal characteristics analyzed with gas and microbial community in thermophilic aerobic digestion for piggery waste treatment. Water Sci Technol 2004; 49:349-357. [PMID: 15137444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In order to characterize the nitrogen conversion characteristics in a thermophilic aerobic digestion (TAD) system, a laboratory study has been conducted with the analysis of effluent gas and microbial community in the sludge samples. The lab TAD system was operated with HRT of 3 days and 60 degrees C. Based on the nitrogen mass balance, it has been found that about 2/3 of the daily load of nitrogen was converted to the gaseous form of nitrogen whereas cellular transformation and unmetabolized nitrogen accounted for about 1/3. Among the gaseous nitrogen transformation, significant amount of influent nitrogen had been converted to N2 gas (29% of influent N) and N2O (9% of influent N). Ammonia conversion was only 28% of influent N. The detection of N2O gas is a clear indication of the biological nitrogen reduction process in the thermophilic aerobic digester. No conclusive evidence for the existence of aerobic deammonification has been found. The microbial community analysis showed that thermophilic bacteria such as Bacillus thermocloacae, Bacillus sp. and Clostridial groups dominated in this TAD reactor. The diverse microbial community in TAD sludge may play an important role in removing both strong organics and nitrogen from piggery waste.
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Affiliation(s)
- J W Lee
- The Research Institute for Environmental Technology and Sustainable Development, Korea University, 5-1 Anam-dong, Sungbuk-ku, Seoul 136-701, Korea
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Yi YS, Kim S, An S, Choi SI, Choi E, Yun Z. Gas analysis reveals novel aerobic deammonification in thermophilic aerobic digestion. Water Sci Technol 2003; 47:131-138. [PMID: 12862227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A laboratory-scale thermophilic aerobic digester was operated with piggery wastewater. The operating temperature varied from 50-70 degrees C. It has been found that excessive nitrogen removal occurred in the laboratory-scale thermophilic system at various HRTs. Nitrite and nitrate were not observed in the effluent. Gas measurement reveals the presence of significant amount of N2O along with NH3 gas. The rational production of N2O gas in accordance with temperature and HRT suggests that biologically mediated deammonification processes significantly contribute to the N removal. Although further microbiological investigation is required to clarify the exact nitrogen removal mechanism, the large production of N2O gas seems to be a result of the existence of a rapid growing heterotrophic deammonification process in the thermophilic system.
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Affiliation(s)
- Y S Yi
- Dept. of Environmental Engineering, Korea University, Jochiwon, Choong Nam 394-800, Korea
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Hong SJ, Yi YS, Koh SS, Park OK, Kang HS. Isolation of an extragenic suppressor of the rna1-1 mutation in Saccharomyces cerevisiae. Mol Gen Genet 1998; 259:404-13. [PMID: 9790597 DOI: 10.1007/s004380050830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The small GTPase Ran is essential for nucleocytoplasmic transport of macromolecules. In the yeast Saccharomyces cerevisiae, Rna1p functions as a Ran-GTPase activating protein (RanGAP1). Strains carrying the rna1-1 mutation exhibit defects in nuclear transport and, as a consequence, accumulate precursor tRNAs. We have isolated two recessive suppressors of the rna1-1 mutation. Further characterization of one of the suppressor mutations, srn10-1, reveals that the mutation (i) can not bypass the need for Rna1p function and (ii) suppresses the accumulation of unspliced pre-tRNA caused by rna1-1. The SRN10 gene is not essential for cell viability and encodes an acidic protein (pI = 5.27) of 24.8 kDa. Srn10p is located in the cytoplasm, as determined by indirect immunofluorescence microscopy. Two-hybrid analysis reveals that there is a physical interaction between Srn10p and Rna1p in vivo. Our results identify a protein that interacts with the yeast RanGAP1.
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Affiliation(s)
- S J Hong
- Department of Microbiology, College of Natural Sciences, Seoul National University, Korea
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