Acute and chronic toxicity of phenol on the mortality, long-term survival and respiration rates of the mysid, Archaeomysis kokuboi adult and juvenile were examined. This experiment was condurted by static bioassay procedure with the different salinity at $25^{\circ}C$ In lethal test, the test animals were exposed to 6 different phenol concentrations to determine $LC_{50}$ and I$LT_{50}$ (median lethal concentration and time) values. The $LC_{50}$ values with the exposure time for the mysid adult ranged from 31.31ppm to 1.49ppm phenol and for the mysid juvenile ranged from 6.90ppm to 0.26ppm in all experimental groups. Mortality was increased with the decrease of salinity, The $96hr-LC_{50}$ values at 16, 24 and $32\%o$ salinity for the mysid adult were 1.49, 2.71 and 4.53ppm phenol, white the values for the mysid juvenile were 0.26, 0.56 and 0.71ppm, respectively. The ratios of $96hr-LC_{50}$ values for the mysid adult to those for the mysid juvenile at 16, 24 and $32\%p$ salinity were 5.73, 4.84 and 6.38, respectively. The mysid juveniles were more sensitive to phenol than the mysid adults. Compared $LT_{50}$ values for the mysid adult with those for the mysid juvenile, the $LT_{50}$ values for the mysid adult ranged from 384.7 to 29.0 hours at 1.7-127ppm phenol concentrations and for the mysid juvenile ranged from 132.2 to 18.7 hours at 0.5~6.Oppm phenol concentrations. The lowest $LT_{50}$ values for the mysid adult and juvenile were showed at the combination of the highest experimental concentration of phenol and the lowest experimental salinity. The mysid juveniles showed lower $LT_{50}$ values than those of adults. The chronic effects of phenol on the mysid at the sublethal effective concentration of phenol were lower in the $32\%o$ salinitr group than 16 or $24\%o$ salinity groups. Oxygen consumption rates of the mysid adult were decreased with the increase of phenol concentration and exposure time, and decreased significantly in lower salinity at the same concentration or phenol.
Purpose: Previous studies suggest that the concentration of 25-hydroxyvitamin D [25(OH)D] in cord blood may show an inverse association with respiratory tract infections (RTI) during childhood. The aim of the present study was to examine the influence of 25(OH)D concentrations in cord blood on infant RTI in a Korean birth cohort. Methods: The levels of 25(OH)D in cord blood obtained from 525 Korean newborns in the prospective COhort for Childhood Origin of Asthma and allergic diseases were examined. The primary outcome variable of interest was the prevalence of RTI at 6-month follow-up, as diagnosed by pediatricians and pediatric allergy and pulmonology specialists. RTI included acute nasopharyngitis, rhinosinusitis, otitis media, croup, tracheobronchitis, bronchiolitis, and pneumonia. Results: The median concentration of 25(OH)D in cord blood was 32.0 nmol/L (interquartile range, 21.4 to 53.2). One hundred and eighty neonates (34.3%) showed 25(OH)D concentrations less than 25.0 nmol/L, 292 (55.6%) showed 25(OH)D concentrations of 25.0-74.9 nmol/L, and 53 (10.1%) showed concentrations of ${\geq}75.0$ nmol/L. Adjusting for the season of birth, multivitamin intake during pregnancy, and exposure to passive smoking during pregnancy, 25(OH)D concentrations showed an inverse association with the risk of acquiring acute nasopharyngitis by 6 months of age (P for trend=0.0004). Conclusion: The results show that 89.9% of healthy newborns in Korea are born with vitamin D insufficiency or deficiency (55.6% and 34.3%, respectively). Cord blood vitamin D insufficiency or deficiency in healthy neonates is associated with an increased risk of acute nasopharyngitis by 6 months of age. More time spent outdoors and more intensified vitamin D supplementation for pregnant women may be needed to prevent the onset of acute nasopharyngitis in infants.
Choi Jung Youn;Park Mi Young;Kim Hye Suk;Lee Kyung Hoon;Kim Jun Sik;Park Yong Hoon
Childhood Kidney Diseases
/
v.9
no.2
/
pp.159-166
/
2005
Purpose : Recently the merits of 6 weeks of initial prednisolone treatment for pediatric primary nephrotic syndrome have been reported, and the use of the 6 week regimen is increasing. We compared our experiences with the 6 week treatment versus the 4 week treatment for Korean patients. Methods : We conducted a retrospective analysis of 69 children who had primary nephrotic syndrome and who were followed up for at least 12 months in the 4 major medical centers in Daegu. The remission rate, the relapse rate, the frequency of relapse and complication of steroid treatment were compared between the 4 weeks and 6 weeks treatment group. Results : Of the 69 children, 42 were in the 4 week treatment group and 27 were in the 6 week group. The median age, blood pressure, serum total protein, serum albumin, cholesterol, creatinine, estimated creatinine clearance, 24 hour urine protein and 12 month cumulative dose did not differ between the two groups. Among the children who relapsed after steroid treatment, the relapse time was significantly later for the 6 week treatment group. The relapse rate after 1 year of treatment was 62$\%$ in the 4 week treatment group and 52$\%$ in the 6 week treatment group; however, there was no statistically significant difference between the two groups. The frequency of relapse at 12 months was $1.5{\pm}1.2$ times in the 4 week treatment group and $1.1{\pm}1.2$ times in the 6 week treatment group, and there was not different between the two groups. The most common side effects of steroid treatment were an increase of appetite and a cushingoid appearance, and there was no statistical difference between the two groups. Among the 27 children who had kidney biopsies performed, 21 suffered from minimal change nephrotic syndrome. Conclusion : The first relapse time after steroid treatment was significantly later in the 6 week steroid treatment group. The frequency of relapse and the 12 month cumulative dose of steroid were lower in the 6 week treatment group, but there was no statistical significance between the two groups. The side effects of steroid treatment did not differ between the two groups. We need to study the long term side effects and the advanced regimens of steroid treatment in the future.(J Korea Soc Pediatr Nephrol 2005;9:159-166)
Song, Suk Ho;Hahn, Hye Sook;Kyung, Sun Young;Hwang, Jun Kyu;An, Chang Hyeok;Lim, Young Hee;Park, Gye Young;Park, Jeong Woong;Jeong, Seong Hwan
Tuberculosis and Respiratory Diseases
/
v.52
no.4
/
pp.330-337
/
2002
Background : A pulmonary tuberculoma is one of the most common causes of a solitary pulmonary lesion. Treating a tuberculoma is still controversial and there are few reports on antituberculosis chemotherapy. In this study, the clinical findings and changes in the size of tuberculomas on a radiograph after completing antituberculosis chemotherapy was investigated. Methods : The medical records, an chest radiographs of 18 pulmonary tuberculoma patients who were admitted to the Gachon medical school, Ghil medical center between April 1998 and August 2001, were reviewed. The symptomatic changes were recorded and the size of the tuberculomas following treatment were compared. To compare the size, the long distance of each tuberculoma on the chest radiographs were measured and the additional radiological findings of calcification, satellite nodules and cavities were investigated. Results : Fifteen patients were men and 3 were women. The median age was 46 (24-74). Among these 18 patients, 14 patients had clinical symptoms. The other 4 patients were diagnosed incidentally as during a routine chest radiograph. The mean size of the tuberculomas on the initial plain chest film was $4.3{\pm}2.3cm$(range : 1.7-10 cm) and after 6 months treatment, it had decreased to $1.68{\pm}2.00cm$(range : 1.5-6.5 cm) (P<0.05). At least 6 months of antituberculosis chemotherapy resulted in the findings of a tuberculoma with a disappearance in 9, a decreased size in 4, and no change in 5 on the chest radiograph. Calcifications were found in 3 patients on the initial chest film and the chest CT and all calcified tuberculomas had disappeared after treatment. Conclusion : Although a pulmonary tuberculoma can remain as an inactive lesion for a long time, if it is confirmed by pathological or bacteriological methods, antituberculosis chemotherapy will be beneficial despite the presence of calcification.
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.
Background: Surgical resection is accepted widely as the standard therapy for complete resectable pulmonary metastases. The number of cases of pulmonary metastasectomy and its survival rate is increasing due to the development of the therapeutic modalities. We attempted to analyze the survival rate and prognosis factors of pulmonary metastasectomy during the last 10 years. Material and Method: We retrospectively analyzed the data of 89 patients who underwent 96 procedures of pulmonary metastasectomy between January 1996 and December 2005. The factors that may influence the long term prognosis such as completeness of resection, the type of primary cancer, the disease-free interval, the number and size of metastasis and the laterality were investigated. Result: There was no operative mortality. The mean disease free interval (DFI) was $29.6{\pm}27.9$ months and there were 3 cases of synchronous metastasis (3.4%). The overall 3, 5 and 10 year survival rate was 52.5%, 32.1% and 20.7%, respectively. The median survival time was 38 months. The 5-year survival rate according to the IRLM appraisal was 63.5%, 33.3%, 22.1% and 0% for stage I, II, III and IV, respectively Univariate analysis showed a better prognosis for patients with a disease free interval of 36 months or more, unilateral metastasis and 4 or less metastases. Conclusion: The survival rate for completely resectable pulmonary metastasectomy was favorable. The disease free interval, laterality and the number of metastasis were the prognosis factors.
Seo, Sam-Yeol;Srikanth, Koigoora;Kwon, Gi-Myon;Jang, Sin-Ae;Kim, Yong-Gyun
Korean journal of applied entomology
/
v.51
no.1
/
pp.47-58
/
2012
Effect of a new crop protectant 'Bt-Plus' on natural enemies was analyzed in this study. Tested natural enemies included two parasitic species of $Aphidius$$colemani$ and $Eretmocerus$$eremicus$, and four predatory species of $Harmonia$$axyridis$, $Orius$$laevigatus$, $Amblyseius$$swirskii$, and $Phytoseiulus$$persimilis$. 'Bt-Plus' was formulated by combination of three entomopathogenic bacteria ($Xenorhabdus$$nematophila$ (Xn), $Photorhabdus$$temperata$ subsp. $temperata$ (Ptt), $Bacillus$$thuringiensis$ (Bt)) and bacterial metabolite (BM). All three types of 'Bt-Plus' showed significantly higher toxicities against fourth instar $Plutella$$xylostella$ larvae than Bt single treatment. Two types of bacterial mixtures ('Xn+Bt' and 'Ptt+Bt') showed little toxicity to all natural enemies in both contact and oral feeding assays. However, 'BM+Bt' showed significant toxicities especially to two predatory mites of $A.$$swirskii$ and $P.$$persimilis$. The acaricidal effects of different bacterial metabolites were evaluated against two spotted spider mite, $Tetranychus$$urticae$. All six BM chemicals showed significant acaricidal effects. The BM mixture used to prepare 'Bt-Plus' showed a high acaricidal activity with a median lethal concentration at 218.7 ppm (95% confidence interval: 163.2 - 262.3). These toxic effects of bacterial metabolites were also proved by cytotoxicity test against Sf9 cells. Especially, benzylideneacetone, which was used as a main ingredient of 'BM+Bt', showed high cytotoxicity at its low micromolar concentration.
Background : Recurrent pneumonia in adults is not uncommon. However, there is no domestic data about recurrent pneumonia in adults. Therefore, we investigated the associated diseases and clinical findings of recurrent pneumonia in adults. Methods : Among 5513 patients who were treated in five teaching hospitals of Hallym medical center?over a 5-year period, we retrospectively reviewed the medical records of the 58 who were compatible with diagnostic criteria of recurrent pneumonia. Results : The number of patients with recurrent pneumonia was 58 (1.05%, 58/5513) during the 5 years. Thirtyseven patients were male and 21 were female. Mean age was 66.4 (${\pm}14.9$) years. Median interval between each pneumonic episode was 18.5 months. Associated diseases were 25 cases of respiratory diseases, 13 of heart diseases, 13 of diabetes mellitus, 7 of lung malignancies, 11 of malignancies other than lung, 7 of neurologic disease, and 8 of miscellaneous diseases. Three cases had no underlying illness. Of the 8 cases with 2 or more times of recurrence, 4 were associated with respiratory diseases, 2 with aspiration pneumonia due to neurologic diseases, 1 with heart disease and 1 with no underlying illness. Recurrent pneumonic episodes affecting the same location were 30 of the total recurrent pneumonic episodes (30/67, 47.8%) and common associated diseases were respiratory diseases including lung malignancies. The etiology of recurrent pneumonia was Streptococcus pneumoniae, methicillinresistant Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae, atypical organisms, etc. Conclusion : Recurrent pneumonia in adults had a low incidence rate compared with children, but most cases had associated illness. Respiratory diseases including lung cancer were the most common associated illness of recurrent pneumonia.
We followed prospectively some hospital-delivered mothers to identify characteristics of those not initiated breast-feeding and predictors of breast-feeding discontinuation in monthly telephone interviews. Recruits were composed of 482 mothers who delivered their babies at one university hospital and one OB/GYN clinic in September to November 1991. Breast-feeding discontinuation was defined as switch to 100% formula lasting more than one week regardless of solid foods. Average age of the study subjects was 27.3 years of age(standard deviation 3.2). Multiple logistic regression analysis indicated native place, occupation, method of delivery and method of feeding considered to be better for maternal health were statistically significant(p<0.1) between initiators and non-initiators of breast feeding. In starting cohort(N=242) of those initiated breast-feeding, that median of breast-feeding discontinuation were 5 months and 25th and 75th percentiles were 3 and 9 months respectively. In Cox's proportional hazard model, mothers with $10\sim13$ years of education were 2.63 times (95% confidence interval, CI $1.50\sim4.60$) more likely to discontinue than those with less than 9 years of education and those with more than 13 years of education were 3.55 time (95% CI $1.99\sim6.33$). Compared with house wife, mothers with part-time jobs were 1.99 times (95% CI $0.86\sim4.57$) more likely to discontinue and those with employed full-time were 1.55 times (95% CI $0.96\sim2.51$). These results suggest that the predictors of initiation and discontinuation of breast-feeding may be different and different target populations should be selected to promote initiation and to prevent discontinuation of breast-feeding according to the period after birth.
Purpose : This paper reports a dosimetric study of 88 patients treated with a combination of external radiotherapy and high dose rate ICR for FIGO stage IIB carcinoma of the cervix. The purpose is to investigate the correlation between the radiation doses to the rectum, external radiation dose to the whole pelvis, ICR reference volume, TDF BED and the incidence of late rectal complications, retrospectively. Materials and Methods : From November 1989 through December 1992, 88 patients with stage IIB cervical carcinoma received radical radiotherapy at Department of Radiation Oncology in Yonsei University Hospital. Radiotherapy consisted of 44-54 Gy(median 49 Gy) external beam irradiation plus high dose rate intracavitary brachytherapy with 5 Gy per fraction twice a week to a total dose of 30 Gy on point A. The maximum dose to the rectum by contrast(r, R) and reference rectal dose by ICRU 38(dr, DR) were calculated. The ICR reference volume was calculated by Gamma Dot 3.11 HDR planning system, retrospectively The time-dose factor(TDF) and the biologically effective dose (BED) were calculated. Results : Twenty seven($30.7\%$) of the 88 patients developed late rectal complications:12 patients($13.6\%$) for grade 1, 12 patients($13.6\%$) for grade 2 and 3 patients($3.4\%$) for grade 3. We found a significant correlation between the external whole pelvis irradiation dose and grade 2, 3 rectal complication. The mean dose to the whole pelvis for the group of patients with grade 2, 3 complication was Higher, $4093.3\pm453.1$ cGy, than that for the patients without complication, $3873.8\pm415.6$ (0.05
$7163.0\pm838.5$ cGy, than that for the Patients without rectal complication, $0772.7\pm884.0$ (p<0.05). There was no correlation of the rate of grade 2, 3 rectal complication with the iCR rectal doses(r, dr), ICR reference volume, TDF and BED. Conclusion : This investigation has revealed a significant correlation between the dose calculated at the rectal dose by ICRU 38(DR) or the most anterior rectal dose by contrast(R) dose to the whole pelvis and the incidence of grade 2, 3 late rectal complications in patients with stage IIB cervical cancer undergoing external beam radiotherapy and HOR ICR. Thus these rectal reference points doses and whole pelvis dose appear to be useful Prognostic indicators of late rectal complication in high dose rate ICR treatment in cervical carcinoma.
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