• Korean Journal of Food Science and Technology
• /
• v.38 no.1
• /
• pp.47-51
• /
• 2006

Microorganisms involved in decaying Fuji apples during storage were investigated. Seven pathogens were isolated from the rotted fruits. Penicillium spp. was derived from 65-75% of decayed apples with P. expansum being dominant species. Effects of mild heat treatment on microbial reduction, respiration, and texture characteristics in Fuji apples were examined through hot water dipping at $40-65^{\circ}C$ for varied timε periods. Initial counts of total microorganisms and moulds in fresh fruits s showed 4.75 and 4.66 log CFU/g in a stem, as well as 5.35 and 4.32 log CFU/g in a calyx, respectively. The heat treatment at $40^{\circ}C$ for 180 min significantly reduced the population of total microorganisms and moulds in the fruits. Respiration rate of the apple fruits increased immediately after heat treatment and then returned to the normal level during storage. The rates of ethylene production in the fruits treated at $40-50^{\circ}C$ were maintained lower than that of the untreated control. The fruits treated at $40^{\circ}C$ showed slightly greater flesh firmness than the other apple samples during storage.

• Current Research on Agriculture and Life Sciences
• /
• v.20
• /
• pp.55-63
• /
• 2002

This experiment was to know properties of Sericin Jam that development, growth of silkgland, content of sericin and composition of amino acid in hemolymph. The characters of Sericin Jam can he seen form this experiment. Hatching ratio was 85% in Sericin Jam and 95% in Jam 120. Especially hatching period of Sericin Jam was longer than Jam 120 and also hatching of Sericin Jam was ununiform. The larval duration of Sericin Jam was 20 days and 23 hours, and Jaw 120 was 21 days and 22 hours. In Sericin Jam, middle silkgland contain a great p arts in silkgalod and posterior silkgand is short and no curves. The period of mounting to emergence was 12 days in Sericin Jam. The period of pupa was 7day. It is property of Sericin Jam that the period is short. Cocoon was very thin and light in Sericin Jam. Weight of cocoon shell of Sericin Jam is 2.7cg. The sericin protein quantity was 100% in cocoon shell of Sericin Jam, about 28% in cocoon shell of Jam 120, however the sericin ratio per Sericin Jam cocoon was 34.6% compare to cocoon shell of Jaw 120 in sericin protein quantity. The amino acids in hemolymph of Sericin Jaw was much hidtidine, lysine, glut amic acid. And the amount of almost amino acids were increased depends upon development at t he 5th instar.

• Resources Recycling
• /
• v.26 no.4
• /
• pp.50-55
• /
• 2017

Determination of trace elements in a sample including complicated matrix is very difficult due to the interference by the matrix. Therefore, if the trace elements can be separated from the complex sample matrix and determined, the interference effects can be reduced, and it is very helpful for the overall analysis. In this study, the analytes of trace elements were separated from the sample matrix by co-precipitation with trace elements using indium hydroxide ($In(OH)_3$), then detected by inductively coupled plasma-atomic emission spectrometer (ICP-AES). Above all, the optimal conditions for the co-precipitation of elements with indium hydroxide were experimentally established. At last, salt was analyzed by the developed analytical method. No heavy metals were not found in Shinan Jeungdo salt, but trace amounts of several heavy metals except for cadmium were found in Cheonnam Yongkwang salt.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.26 no.4
• /
• pp.595-600
• /
• 1997

To extend the shelf-life of Kochujang, the effects of anti-browning agents and their optimum concentrations were evaluated using organic acids as synergists. Among the physicochemical analyses, amino nitrogen content exhibited the highest correlation with sensory score. Ascorbic acid and citric acid were selected among the anti-browning agents(ascorbic acid, potassium sorbate, calcium chloride) and organic acids(citric acid, lactic acid, oxalic acid) tested on the basis of the highest amino nitrogen content during storage at 55$^{\circ}C$. The appropriate concentration of ascorbic acid was 0.03% based on amino nitrogen content during storage at 55$^{\circ}C$. Combination of 0.06% citric acid with 0.03% ascorbic acid showed the highest amino nitrogen content during storage at 55$^{\circ}C$. From the results, the 0.03% ascorbic acid and 0.06% citric acid were selected as additives for extending the shelf-life. Control(no additive) and additives(0.03% ascorbic acid and 0.06% citric acid) were tested for physicochemical and sensory analyses during storage at 45$^{\circ}C$ and 55$^{\circ}C$. Amino nitrogen content was also highly correlated with sensory score, The marginal amounts of amino nitrogen for control and additives were 174.9mg% and 173.2mg%, respectively. Degradation rate of amino nitrogen was a first order reaction. Compared to control, the predicted shelf-life for adding additives increased 69% and 56% at 45$^{\circ}C$ and 55$^{\circ}C$, respectively.

• Journal of the Korean Society of Child Welfare
• /
• no.56
• /
• pp.1-32
• /
• 2016

The present study examined the mediating effects of parent-child stress on the relationship between perceived neighborhood disorder and problem behaviors. The research hypotheses were based on Pearlin's(1999) stress process model and findings from previous literature. The data from the $4^{th}$-wave of the Korea Youth Panel Survey (KYPS; a panel survey of $8^{th}$-grade students) were analyzed to identify the relationships between the study variables. The sample included 2,301 adolescents (16 to 18 years old). Findings showed that parent-child stress partially mediated the relationship between perceived neighborhood disorder and problem behaviors in adolescents. As adolescents perceived more neighborhood disorder, they were more likely to experience anxiety/depression and aggression. In addition, greater neighborhood disorder were found to be associated with the higher levels of the parent-child stress. Furthermore, when controlling for perceived neighborhood disorder, the higher levels of the parent-child stress were found to be associated with the higher levels of anxiety/depression and aggression. The Sobel test and bootstrapping results showed that parent-child stress partially mediates the relationship between perceived neighborhood disorder and anxiety/depression, as well as the relationship between perceived neighborhood disorder and aggression. Based on the results, we discussed social welfare implications of the study findings to prevent adolescent problem behavior as well as the limitations of the study.

• Korean Journal of Soil Science and Fertilizer
• /
• v.44 no.5
• /
• pp.727-733
• /
• 2011

A new Korean standard for the determination of Cr(VI) in soils has been officially published as ES 07408.1 in 2009. This analytical method is based on the hot alkaline digestion and colorimetric detection prescribed by U.S. EPA method 3060A and 7196A. The hot alkaline digestion accomplished using 0.28 M $Na_2CO_3$ and 0.5 M NaOH solution (pH 13.4) at $90{\sim}95^{\circ}C$ determines total Cr(VI) in soils extracting all forms of Cr(VI), including water-soluble, adsorbed, precipitated, and mineral-bound chromates. This aggressive alkaline digestion, however, proved to be problematic for certain soils which contain large amounts of soluble humic substances or active manganese oxides. Cr(III) could be oxidized to Cr(VI) by manganese oxides during the strong alkaline extraction, resulting in overestimation (positive error) of Cr(VI). In contrast, Cr(VI) reduction by dissolved humic matter or Fe(II) could occur during the neutralization and acidic colorimetric detection procedure, resulting in underestimation (negative error) of Cr(VI). Futhermore, dissolved humic matter hampered the colorimetric detection of Cr(VI) using UV/Vis spectrophotometer due to the strong coloration of the filtrate, resulting in overestimation (positive error) of Cr(VI). Without understanding the mechanisms of Cr(VI) and Cr(III) transformation during the analysis it could be difficult to operate the experiment in laboratory and to evaluate the Cr(VI) results. For this reason, in this paper we described the theoretical principles and limitations of Cr(VI) analysis and provided useful guidelines for laboratory work and Cr(VI) data analysis.

• Journal of Sericultural and Entomological Science
• /
• v.55 no.2
• /
• pp.33-39
• /
• 2019

Freeze-dried silkworm powder has been approved as a functional ingredients for blood glucose control since 2009. Proximate and nutrient compositions of silkworm powder was summerized as bellow. Silkworm powder contained 4.7% moisture, 57.7% crude protein, 9.5% crude fat, 5.4% crude fiber, and 9.3% ash. The larval protein contained 18 known amino acid including glutamic acid and aspartic acid. Fat is composed of 3:7 ratio of saturated fatty acid to unsaturated fatty acid including various essential fatty acids. It contained 34.7 linolenic acid, 24.4% oleic acid, 20.2% palmitic acid, 9.2% stearic acid, and 7.7% linoleic acid. Five minerals, K, P, Ca, Mg, S were abundant in the silkworm powder with other minerals such as Cu, Mn, Fe, and Zn.

• Journal of Animal Science and Technology
• /
• v.60 no.12
• /
• pp.32.1-32.10
• /
• 2018

Background: Necdin (NDN), a member of the melanoma antigen family showing imprinted pattern of expression, has been implicated as causing Prader-Willi symptoms, and known to participate in cellular growth, cellular migration and differentiation. The region where NDN is located has been associated to QTLs affecting reproduction and early growth in cattle, but location and functional analysis of the molecular mechanisms have not been established. Methods: Here we report the sequence variation of the entire coding sequence from 72 samples of cattle, yak, buffalo, goat and sheep, and discuss its variation in Bovidae. Median-joining network analysis was used to analyze the variation found in the species. Synonymous and non-synonymous substitution rates were determined for the analysis of all the polymorphic sites. Phylogenetic analysis were carried out among the species of Bovidae to reconstruct their relationships. Results: From the phylogenetic analysis with the consensus sequences of the studied Bovidae species, we found that only 11 of the 26 nucleotide changes that differentiate them produced amino acid changes. All the SNPs found in the cattle breeds were novel and showed similar percentages of nucleotides with non-synonymous substitutions at the N-terminal, MHD and C-terminal (12.3, 12.8 and 12.5%, respectively), and were much higher than the percentage of synonymous substitutions (2.5, 2.6 and 4.9%, respectively). Three mutations in cattle and one in sheep, detected in heterozygous individuals were predicted to be deleterious. Additionally, the analysis of the biochemical characteristics in the most common form of the proteins in each species show very little difference in molecular weight, pI, net charge, instability index, aliphatic index and GRAVY (Table 4) in the Bovidae species, except for sheep, which had a higher molecular weight, instability index and GRAVY. Conclusions: There is sufficient variation in this gene within and among the studied species, and because NDN carry key functions in the organism, it can have effects in economically important traits in the production of these species. NDN sequence is phylogenetically informative in this group, thus we propose this gene as a phylogenetic marker to study the evolution and conservation in Bovidae.

• The Korean Journal of Medicine
• /
• v.93 no.6
• /
• pp.548-555
• /
• 2018

Background/Aims: Assessment of fluid status in hemodialysis patents is very important. Overhydration in hemodialysis is associated with generalized edema, cardiovascular complications, and hypertension. The aim of this study was to determine the factors correlated with mortality of hemodialysis patients, assessing body muscle mass and fluid status using bioelectrical impedance analysis (BIA). Methods: This study enrolled 93 patients who underwent hemodialysis between January 2010 and May 2015 at CHA Bundang Medical Center. Medical records of enrollees up to June 2017 were reviewed retrospectively. These included laboratory results (serum albumin, C-reactive protein [CRP], lipid profile, etc.) and BIA data (extracellular water, intracellular water, total body water, soft lean mass, fat free mass, skeletal muscle mass, etc.). Results: Eleven of 93 patients had expired by May 2017. Among the surviving subjects, mean age was younger, CRP levels were lower, albumin levels were higher, and extracellular water/total body water (ECW/TBW) ratios were lower than in the expired patient group. Kaplan-Meier survival analysis revealed that overhydration (ECW/TBW > 0.4) was associated with higher mortality. Conclusions: In hemodialysis patients, overhydration is an important factor in mortality, and BIA could be a reliable modality in its assessment. We suggest that, for hemodialysis patients, overhydration is more of a risk factor for mortality than is muscle wasting.

• Journal of Society of Preventive Korean Medicine
• /
• v.22 no.3
• /
• pp.1-10
• /
• 2018

Backgrounds : In 2017, National Health Insurance implemented the pilot insuring project for Chuna manual therapy(CMT). 65 Korean Medicine(KM) hospitals and clinics were selected in the project to monitor the provision of insured CMT. Objectives : This study aimed to evaluate the effectiveness of CMT for low back pain provided in the real world setting. Methods : Patients with low back pain who agreed to participated in the study were enrolled and requested to complete questionnaires. Patients who received CMT regardless of receiving other KM therapies were classified to Chuna group, and patient who received KM therapies without CMT to KM group. Pain(pain-VAS) and back function(KODI, Oswestry disability index-Korean version), quality of life were assessed at baseline, 4 weeks, and 8 weeks. Additionally, patients who received CMT twice and more, and who's pain-VAS 20 and over were included, and patients who used pain injection were excluded in the analysis. Results : Of 371 patients who completed all questionnaire (mean age=42.6years, SD=12.45; 61% female), 96 were excluded, 170 were in Chuna group, and 105 were in KM group. Proportions of patients who had low back pain for more than twelve weeks in the Chuna group and KM group were 57.7% and 24.8%, respectively. Pain and back function were significantly improved on 4weeks and 8weeks in both groups, but there was no difference between two groups. For the patients in the sub-acute and chronic stage(>=12 weeks), change of total KODI scores in the Chuna group was higher than KM group(p=0.013) at 4weeks. Conclusions : CMT with other KM therapies can improve back function in the sub-acute and chronic patients. For insurance policy decision, economic evaluation of CMT is needed.