Oh, Gunung;Park, Seo Yoon;Lee, Jae-Goo;Kim, Yong Ku;Ra, Ho Won;Seo, Myung Won;Yoon, Sang Jun
Clean Technology
/
v.22
no.1
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pp.53-61
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2016
Steam reforming of tar produced from biomass gasification was conducted using several Ni-based catalysts. In labscale, the catalytic steam reforming of toluene which is a major component of biomass tar was studied. A fixed bed reactor was used at various temperatures of 400-800 ℃. Ru (0.6 wt%) and Mn or K (1 wt%) were applied as a promoter in Ni based catalysts. Generally, Ni/Ru-K/Al2O3 catalyst shows higher performance on steam reforming of toluene than Ni/Ru-Mn/Al2O3 catalyst. Used catalysts were analyzed by XRD and TGA to detect sintering and carbon deposition. Base on the lab-scale studies, the monolith and pellet type catalysts were tested in 1 ton/day scale biomass gasification system. Ni/Ru-K/Al2O3 monolith catalyst shows high tar reforming performance at high temperature. In addition, Ni/Ru-Mn/Al2O3 monolith catalyst was showed deactivation with operation time. Reforming performance of Ni/Ru-K/Al2O3 pellet catalyst which showed 66.7% tar conversion at 587 ℃ was compared to regenerated one. Overall, Ni/Ru-K/Al2O3 pellet catalyst shows higher stability and performance than other used catalysts.
To elucidate the degradation mechanisms of organic materials in Lake Paldang, oxygen consuming rates in the water column, high molecular weight (HMW) organic materials and aggregates were analyzed. Also the chlorophyll a concentrations and environmental factors were measured three times in 1999. The concentrations of chlorophyll a ranged $5.5{\sim}14.2\;mg/m^3$ with the highest peak of $57.7\;mg/m^3$ at the surface water in April. Chlorophyll a concentration of aggregates retrieved from traps in 5 m and 20 m depths in May were 2779.5, $9044.8\;mg/m^3$, respectively. Those vlaues were more than 6 times higher compared with other months, and more than 49 times higher than water column chlorophyll a. Oxygen consuming rates of water column were in the narrow range of $0.4{\sim}0.5\;mg\;O_2\;l^{-1}\;day^{-1}$. HMW organic materials were using only small amount of oxygen, $0.01{\sim}0.04\;mg\;O_2\;l^{-1}\;day^{-1}$. The aggregates retrieved from 5 m depth by sediment trap consumed the oxygen in the range of $0.48{\sim}0.69\;mg\;O_2\;l^{-1}\;day^{-1}$, while aggregates collected from 20 m depth, 0.88 to $1.04\;mg\;O_2\;l^{-1}\;day^{-1}$. With these results, the HMW appeared not to be degraded in the water column, instead they seemed to be concentrated and affected the sediment oxygen demand.
The upland soils (56 samples) from organic farms in Gyeonggi-do (12 sites), Gangwon-do (8 sites), Chungcheong-do (14 sites), Gyeongsang-do (4 sites), Jeollado (18 sites) in Korea were collected and their physical and chemical properties were analyzed by RDA's methods. In the results of physical property, the bulk density of soils averaged $1.14Mgm^{-3}$ (surface soil), $1.38Mgm^{-3}$ (subsoil), respectively. The porosity of them was 57%, 48%. Organically managed soil's (OS) bulk density was lower than conventional soil's but OS's porosity was a little higher than conventionally managed soil in surface soil. The depth of plough layer in organically managed soils was 21.2 cm indicating that the organic farming had good effect on soil physical property. In the results of chemical property, the surface soil pH was 6.9 and the contents of organic matter (OM) was $26gkg^{-1}$, available phosphate (Avail. $P_2O_5$) was $554mgkg^{-1}$, exchangeable calcium (Exch. Ca) was $8.9cmol_ckg^{-1}$, exchangeable potassium (Exch. K) was $0.89cmol_ckg^{-1}$, exchangeable magnesium (Exch. Mg) was $2.0cmol_ckg^{-1}$. The subsoil pH was 6.8 and the contents of OM was $21gkg^{-1}$, avail. $P_2O_5$ was $491mgkg^{-1}$, exch. Ca was $7.9cmol_ckg^{-1}$, exch. K was $0.68cmol_ckg^{-1}$, exch. Mg was $1.8cmol_ckg^{-1}$. The nutrient accumulation emerged in organic farming. Compared to the optimum nutrient range for the conventional upland soils, the exceed rate of pH, OM, available phosphate, and exchangeable Ca, K, and Mg was 79, 52, 64, 84, 66% and 55%, respectively, which mainly resulted from the over-application of lime materials or livestock manure compost. With these results it is suggested that organic farm need to reduce the use of inputs, which make soil alkalification or nutrient accumulation. More study on effects of inputs on lowering soil pH from alkalification could help organically managed soil to be improved.
Kim, Myo Jing;Lee, Hye Jin;Choi, Jung Mi;Jung, Soo Jin;Huh, Jae Won
Clinical and Experimental Pediatrics
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v.49
no.7
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pp.745-750
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2006
Purpose : Enteroviruses are the most common cause of aseptic meningitis in patients of all ages. A definite diagnosis of enteroviral meningitis can be established by detection of virus directly in CSF specimens. But this is time-consuming and lacks sensitivity, so polymerase chain reaction(PCR) detecting of viral RNA in patient specimens such as CSF, stool has been demonstrated. But little is known about the influence of sampling time on the results of CSF PCR and stool PCR. We investigated diagnostic utility of PCR of CSF and stool according to sampling time after the onset of symptoms. Methods : PCR results were analyzed according to sampling time for 42 patients diagnosed aseptic meningits in our hospital from $11^{th}$ January to $30^{th}$ August, 2005. Results : The diagnostic yield of the test was higher of CSF specimens obtained ${\leq_-}2$ days after clinical onset(positive PCR results 9/18, 50 percent), compared with CSF collected >2 days after onset(positive PCR results 1/24, 4.2 percent)(P=0.001). Instead, positive PCR results of fecal specimens maintained highly(average 90.5 percent), 10 cases had also positive PCR results even 5-6 days after onset. 10 cases of CSF specimens had positive enterovirus PCR results containing coxsackievirus B5 (n=6), coxsackievirus B3(n=3). 38 cases of stool specimens had positive enterovirus PCR results containing echovirus 18(n=7), echovirus 9(n=3), coxsackievirus B5(n=8), coxsackievirus B3(n=3). 6 cases(coxackie B5) had positive CSF PCR and stool PCR, both. Conclusion : Stool PCR was clinically sensitive for detecting enterovirus during enteroviral meningits and could give a presumptive diagnosis throughout the disease course. A definite diagnosis was obtained by CSF PCR, but its utility was clearly lower for samples obtained >2 days after clinical onset. Therefore, it is recommended that, in addition to performance of CSF PCR, fecal samples obtained from patients with suspected enteroviral meningitis should be tested by PCR, especially when the duration of symptoms is >2 days.
Purpose : Isolated noncompaction of the ventricular myocardium(INVM) is one of the unclassified cardiomyopathies that is characterized by numerous, excessively prominent trabeculations, and deep intertrabecular recesses. We performed this study to evaluate the clinical features of INVM in children. Methods : The medical records of 10 patients with INVM were reviewed. We analyzed the clinical manifestations, hemodynamics, pattern of inheritance, and long-term prognosis of INVM in children. Results : Age at diagnosis was $45{\pm}53months$(1 day-14 years) with follow-up lasting as long as 78 months. Most INVM was asymptomatic on diagnosis. Associated cardiac anomalies were noted in six patients(ventricualr or atrial septal defect, patent ductus arteriosus with mitral valve prolapse, or mitral valve cleft). Depressed or flat changes of T wave in lead II, III and aVF were observed on electrocardiography. Various arrhythmia including WPW syndrome with paroxysmal supraventricular tachycardia, third-degree atrioventricular block, and familial sick sinus node dysfuction were observed. The degree of trabeculation in INVM was significantly prominent from level of mitral valve to apex compared to age-matched control. Familial recurrences were noted in two patients. The systolic function of the left ventricle was decreased in 20% of patients during the follow-up period, but systemic embolism or ventricular tachycardia was not observed. Conclusion : INVM is not a rare disorder. The cardiac function may be deteriorated in children as well as adults during long-term follow up. Thus early diagnosis and long-term follow-up must be done. So, the nation-wide multicenter clinical study would be mandatory to evaluate the incidence, long-term prognosis, and establishment of objective diagnostic criteria of INVM.
Kim, Hyun Jung;Yeom, Jung Suk;Park, Ji Suk;Park, Eun Sil;Seo, Ji Hyun;Lim, Jae Young;Park, Chan Hoo;Woo, Hyang Ok;Cho, Jae Min;Lee, Jeong Hee;Youn, Hee Shang
Clinical and Experimental Pediatrics
/
v.51
no.11
/
pp.1198-1204
/
2008
Purpose : The cause of subacute necrotizing lymphadenitis, a rare disease in children, has not been completely clarified. This study was aimed to investigate the disease mechanism by examining clinical, radiologic, and immunohistochemical findings in children diagnosed with subacute necrotizing lymphadenitis after an excisional biopsy. Methods : We examined 19 lymph node tissue specimens from 17 children diagnosed with subacute necrotizing lymphadenitis at Gyeongsang National University Hospital from March, 1998 to July, 2006. A retrospective survey of the medical records was performed. CT findings were analyzed. Immunohistochemical staining was done on tissues obtained by excisional biopsy from all patients. Results : The patient's age ranged from 5 to 19 years (average age :11.8 years). The main symptoms included a neck mass (17/19), pain in the mass (6/17), and fever (12/19). The palpable lymph nodes were mostly cervical in location; the maximum diameter, which was measured radiologically, was less than 3 cm in all 10 cases. The masses were pathologically divided into proliferative, necrotic, and xanthomatous types. With immunohistochemical staining the masses were divided into lesion (L), perilesion (PL), and necrosis (N). The CD8 staining was stronger than the CD4 staining for all regions in three types. The CD4 staining intensity was mainly increased in the perilesion, and CD8 was mainly increased in the lesion. Conclusion : We compared the radiologic findings, clinical symptoms, and pathology to help understand the cause of disease in patients with subacute necrotizing lymphadenitis.
Kim Sung-Ho;Cho Chul-Koo;Kim Tae-Hwan;Chung In-Yong;Yoo Seong-Yul;Koh Kyoung-Hwan;Yun Hyong-Geun
Radiation Oncology Journal
/
v.11
no.1
/
pp.35-42
/
1993
The dose response of the number of micronuclei in cytokinesis-blocked (CB) lymphocytes after in vitro irradiation with $\gamma$-rays and neutrons in the 5 dose ranges was studied for a heterogeneous population of 4 donors. One thousand binucleated cells were systematically scored for micronuclei. Measurements performed after irradiation showed a dose-dependent increase in micronuclei (MN) frequency in each of the donors studied. The dose-response curves were analyzed by a linear-quadratic model, frequencies per 1000 CB cells were ($0.31{\pm}0.049$)D+($0.0022{\pm}0.0002)D^2+(13.19{\pm}1.854) (r^2=1.000,\;X^2=0.7074,\;p=0.95$) following $\gamma$ irradiation, and ($0.99{\pm}0.528$)\;D+(0.0093{\pm}0.0047)\;D^2+(13.31{\pm}7.309)\;(r^2=0.996,\;X^2=7.6834,\;p=0.11) following neutrons irradiation (D is irradiation dose in cGy). The relative biological effectiveness (RBE) of neutrons compared with $\gamma$-rays was estimated by best fitting linear-quadratic model. In the micronuclei frequency between 0.05 and 0.8 per cell, the RBE of neutrons was $2.37{\pm}0.17$. Since the MN assay is simple and rapid, it may be a good tool for evaluating the $\gamma$-ray and neutron response.
Purpose : Several studies have reported the recent increase in the incidence of acute poststreptococcal glomerulonephritis(APSGN). The objective of this study is to see changes of clinical findings/manifwstation in children with APSGN. Methods : Medical records of 63 children who were diagnosed with APSGN in the deparment of Pediatrics, Kyungpook National University Hospital, between January 1992 and December 2006 were reviewed retrospectively. We analyzed various clinical characteristics such as age, sex, degrees of proteinuria, degrees of hematuria, and presence or absence of histories of systemic antibiotic use in children with APSGN, and compared the children with APSGN who were diagnosed between 1992 and 2000 to those who were diagnosed between 2001 and 2006. Results : Age of the patients ranged from 2-14 years(median 7.11 years) at the time of disease onset. Study patients consisted of 41 boys and 22 girls. APSGN followed infection of the throat in 87% of cases. Patient developed an acute nephritic syndrome 12 days after an antecedent streptococcal pharyngitis. Forty patients presented with gross hematuria. Fortyone patients had hypertension at the time of diagnosis. Hypertension disappeared within 7.8$\pm$8.2 days, gross hematuria within 11.3$\pm$17.2 days and microscopic hematuria within 3.5$\pm$3.9 months from the disease onset. Patients in 2001-2006 had significantly higher increase of antistreptolysin O(ASO) titer. However, no significant differences in clinical characteristics were observed. Age, sex, severity of proteinuria, gross or microscopic hematuria, antibiotic therapy did not affect the clinical manifestations of glomerulonephritis. In other words, hypertension, duration of hematuria, recovery of serum C3 level are not different between the two time periods. Conclusion : Our data indicates that patients in 2001-2006 had significantly higher level of ASO titer. However, they did not show significant clinical differences. To evaluate the causes of the resurgence of APSGN, a national epidemic is needed.
Purpose : Many papers support a correlation between rectal complications and rectal doses in uterine cervical cancer patients treated with radical radiotherapy. In vivo dosimetry in the rectum following the ICRU report 38 contributes to the quality assurance in HDR brachytherapy, especially in minimizing side effects. This study compares the rectal doses calculated in the radiation treatment planning system to that measured with a silicon diode the in vivo dosimetry system. Methods : Nine patients, with a uterine cervical carcinoma, treated with Iridium-192 high dose rate brachytherapy between June 2001 and Feb. 2002, were retrospectively analysed. Six to eight-fractions of high dose rate (HDR)-intracavitary radiotherapy (ICR) were delivered two times per week, with a total dose of $28\~32\;Gy$ to point A. In 44 applications, to the 9 patients, the measured rectal doses were analyzed and compared with the calculated rectal doses using the radiation treatment planning system. Using graphic approximation methods, in conjunction with localization radiographs, the expected dose values at the detector points of an intrarectal semiconductor dosimeter, were calculated. Results : There were significant differences between the calculated rectal doses, based on the simulation radiographs, and the calculated rectal doses, based on the radiographs in each fraction of the HDR ICR. Also, there were significant differences between the calculated and measured rectal doses based on the in-vivo diode dosimetry system. The rectal reference point on the anteroposterior line drawn through the lower end of the uterine sources, according to ICRU 38 report, received the maximum rectal doses in only 2 out of the nine patients $(22.2\%)$. Conclusion : In HDR ICR planning for conical cancer, optimization of the dose to the rectum by the computer-assisted planning system, using radiographs in simulation, is improper. This study showed that in vivo rectal dosimetry, using a diode detector during the HDR ICR, could have a useful role in quality control for HDR brachytherapy in cervical carcinomas. The importance of individual dosimeters for each HDR ICR is clear. In some departments that do not have the in vivo dosimetry system, the radiation oncologist has to find, from lateral fluoroscopic findings, the location of the rectal marker before each fractionated HDR brachytherapy, which is a necessary and important step of HDR brachytherapy for cervical cancer.
This study isolated and purified the antimicrobial peptide McSSP-31 from an acidified hemocyte extract of a Mytilus coruscus. The antimicrobial peptide was purified by using a $C_{18}$ reversed-phase high-performance liquid chromatography (HPLC). The peptide was determined to be 3330.549 Da by matrix assisted-laser desorption ionization time-of-flight mass spectrophotometer (MALDI-TOF/MS). The N-terminus of a 14 amino-acid sequence was identified as P-S-P-T-R-R-S-T-S-R-S-K-S-R by Edman degradation method. The acquired sequence showed a 93% similarity with the sperm-specific protein Phi-1, which is from M. californianus. The identified open-reading frame (ORF) of peptide was 306 bp encoding 101 amino acids, which was analyzed by rapid amplification of cDNA ends (RACE), cloning and sequencing analysis. We compared the full sequence with other known proteins that reveal the sperm-specific protein Phi-1 (93.5%) of M. californianus. Synthesized antimicrobial peptide (McSSP-31) showed antibacterial activity against gram-positive bacteria including B. subtilis, S. mutans, S. aureus and gram-negative bacteria including E. coli, K. pneumoniae, P. mirabilis, P. aeruginosa and fungi, C. albicans. Also, synthesized peptide showed strong antibacterial activity against antibiotic-resistant strains, including S. aureus. The cytotoxicity of the peptide was determined by using the HUVEC human cell line. The peptide did not exhibit any significant cytotoxic effects on the normal human cell line, and it had very low hemolytic activity with flounder hemoglobin. The results demonstrated that peptide purified from the hemocyte of a M. coruscus exhibits antibacterial activity against various bacteria and has the potential to be an alternative antibiotic agent.
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