This study was investigated to determine the contamination levels of total aerobic bacteria, coliform group, $E.$$coli$ and food-borne pathogens of side dishes from 2 traditional markets (100 samples) and 2 super markets (100 samples) located on Ulsan. The levels (range) of total aerobic bacteria was 4.75 log CFU/g (1.60~6.92 log CFU/g) in traditional market and 4.62 log CFU/g (2.00~6.46 log CFU/g) in super market, respectively. Coliform was detected in 64 and 66 samples sold at traditional markets and super markets, respectively. $E.$$coli$ was detected in 4 and 6 samples sold at traditional markets and super markets, respectively. The food-borne pathogens, namely $Bacillus$$cereus$ and $Listeria$$monocytogenes$ were detected in 1 sample sold at traditional markets, respectively, and $Bacillus$$cereus$ was detected in 4 samples sold at super markets. However, other pathogens such as $Salmonella$ spp., $Shigella$ spp., $Vibrio$$parahaemolyticus$, $Yersinia$$enterocolitica$, $Clostridium$$perfringens$, $Camphylobacter$$jejuni$ and Pathogenic $E.$$coli$ were not detected. The $Saengchae$ and $Seasoned$$Jeotgal$ were relatively vulnerable compared to the others in the food-borne pathogens.
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.38
no.4
/
pp.284-288
/
2002
The authors examined the response of electrocardiogram (ECG) to Mirror carp, Cyprinus carpio of body length. The experiments were performed of three classes (10~15, 15~20 and 20~25cm) were given to fishes with an electrode inserted into their bodies and then their ECGs were recorded continuously for 30 minutes in 16-18$^{\circ}C$. The results which are divided into by day and by night and then analyzed by fishes' conditions are as follows; 1 In case of body length 10~15 cm, the average heart rate 43.4 beat/min by day and 45.9 beat/min by night, the average action potential 4.38 $mutextrm{V}$ by day and 3.64 $mutextrm{V}$ by night, in narcotism condition(0~9 min). the average heart rate 69.4 beat/min by day and 67.4 beat/min by night, the average action potential 3.82 $mutextrm{V}$ by day and 3.50 $mutextrm{V}$ by night, in stable condition(9~30 min). 2. In case of body length 15~20 cm, the average heart rate 42.2 beat/min by day and 45.4 beat/min by night, the average action potential 4.13 $mutextrm{V}$ by day and 3.95 $mutextrm{V}$ by night, in narcotism condition(0-5 min). the average heart rate 67.6 beat/min by day and 65.3 beat/min by night, the average action potential 4.58$mutextrm{V}$ by day and 4.61 $mutextrm{V}$ by night, in stable condition (5~30 min). 3. In case of body length 20~25 cm, the average heart rate 47.5 beat/min by day and 47.5 beat/min by night, the average action potential 4.81 $mutextrm{V}$ by day and 4.20 $mutextrm{V}$ by night, in narcotism condition(0-4 min). the average heart rate 67.5 bea/min by day and 64.8 beat/min by night, the average action potential 5.31 $mutextrm{V}$ by day and 4.90 $mutextrm{V}$ by night, in stable condition (4~30 min).
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.33
no.4
/
pp.352-359
/
1997
The visual acuity of filefish Stephanolepis cirrhifer was studied through a series of experiments by observing their responses to target plates. The fish were trained to respond to the target plates made of white acrylic resin with a vertical black line 5cm long in the center. The width of the black line ranged from 0.2mm to 8.0 mm. The line width was diminished unto the fish could no longer distinguish the line at a distance of 100 cm from the target plate. This was repeated under light intensities of 400, 20, 5, 3 and 1 lx at the water surface. Fish were rewarded with bait in front of the target plate if the fish went to the target date (i.e., success).The results show that the training effect of 1lensh had a success rate of over 80% and that the reach times to the target plates were 4~5 seconds over 210 experimental tunes. The success rate was high using the thick line with strong apparent contrast, but was low at the 1 lx. The visible critical width of line became thick with decreasing light intensity, 0.24mm at 400 lx, followed by 0.30mm at 20 lx, 0.40mm at 5 lx, 0.46 mm at 3 lx and 2.87mm at 1 lx. The apparent contrast for visible critical width of line increased with decreasing light intensity, 0.01 at 400 and 20 lx, 0.02 at 5 lx, 0.03 at 3 lx and 0.09 at 1 lx. The line acuity of filefish was best 1.21 at the 400 lx, followed by 0.97 at 20 lx, 0.73 at 5 lx, 0.63 at 3 lx and sharply decreased to 0.10 at 1 lx. The visible ranges for 1mm and 6mm in width of line were about 4.2 m and 25.0 m at the 400 lx light intensity and decreased m 1/14 times and 1/12 times of the 400 lx at 1 lx, respectively.
Park, Hyun-Jin;Lee, Jeong-Eun;Kim, Sol-A;Shim, Won-Bo
Journal of Food Hygiene and Safety
/
v.35
no.5
/
pp.459-467
/
2020
In this study, we investigated the changes in both ambient temperature and microbial contamination of fresh convenience foods (FCFs) caused by the behavior of consumers after purchase. According to consumer survey results, it took 0.5 to 3 h put the purchased FCF in a home refrigerator or consume it. Only aerobic bacteria and Staphylococcus aureus (below maximum permitted limit) were detected in FCFs obtained from a local market. During storage of FCFs in a vehicle trunk for up to 3 h. the external and internal temperatures of FCFs were found to be 19 and 18.5℃ in spring, 44 and 42℃ in summer, 31.3 and 29.2℃ in autumn, and 17.6 and 16.8℃ in winter, respectively. Changes in contamination levels of aerobic bacteria on FCFs stored in a vehicle trunk for up to 3 hours are as follows: 2.72 → 3.41 log CFU/g in spring, 3.11 → 4.32 log CFU/g in summer, 3.08 → 3.81 log CFU/g in autumn, 2.71 → 3.36 log CFU/g in winter. S. aureus exceeding the tolerance was detected even when the FCFs were stored in a vehicle trunk for 1 h in summer and autumn and 2 h in spring and winter. Among three boxes (corrugated box, styrofoam box, and corrugated box coated with an aluminum film), the styrofoam box maintained the lowest temperature and showed the lowest growth rate of microorganisms on FCF after storage for 3 h in the vehicle trunk depending on whether ice was added. These results indicated that the possibility of food poisoning occurs when FCFs are exposed to the external environment. It is necessary to provide guidelines regarding storage temperature and allowable time for safe consumption of FCFs after purchase.
This is an approach study on the sensory properties (taste and odor) of 15 types of Korean conventional soups and stews using electronic nose and tongue. The relative sensor intensity for the taste components of the samples using electronic tongue was demonstrated. By SRS (sourness) sensor, sogogi-baechuguk (beef and cabbage soup) had the highest rate of 9.0. The STS (saltiness) sensor showed the highest score of 8.2 for ojingeoguk (squid soup). For the UMS (umami) sensor, which identifies savoriness, the sogogi-baechuguk was the highest at 10.1. The SWS (sweetness) sensors showed relatively little difference, with sigeumchi-doenjangguk (spinach and bean paste soup) at the highest of 7.3. According to the BRS sensor, which tests for bitterness, the siraegi-doenjangguk (dried radish green and bean paste soup) was the highest at 7.8. By principal component analysis (PCA), we observed variances of 56.21% in principal component 1 (PC1) and 25.23% in PC2. For each flavor component, we observed -0.95 and -0.20 for factor loading of PC1 and PC2 for SRS sensors, 0.96 and 0.14 for STS sensors, and -0.94 and 0.22 for PC1 and PC2 for UMS sensors, and PC1 and 0.22 for PC1 and PC2 loading for SWS sensors. The similarity between the samples identified by clustering analysis was largely identified by 4 clusters. A total of 25 kinds of volatile compounds in 15 samples were identified, and the ones showing the highest relative content in all samples were identified as ethanol and 2-methylthiophhene. The main ingredient analysis confirmed variances of 28.54% in PC1 and 20.80% in PC2 as a result of the pattern for volatile compounds in 15 samples. In the cluster analysis, it was found to be largely classified into 3 clusters. The data in this study can be used for a sensory property database of conventional Korean soups and stews using electronic sensors.
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.38
no.4
/
pp.278-283
/
2002
The response of electrocardiogram(ECG) of Nile tilapia, Oreochromis niloticus [Linnaeus] was studied to the electric stimulus which was given to a certain part of body The experiments were performed in such a way that three levels of electric stimulus (20, 30, 40 Vp ; 10 msec) were given to fishes with electrode inserted into their bodies and then their ECGs were recorded continuously for 60 minutes in the water temperature of 16~18$^{\circ}C$ The results of the experiments were divided by day and night, and then were analyzed by experimental conditions as follows; 1. Nile tilapia reached a stable condition within 3 minutes after the electrode inserted into their bodies during anesthesia. In stable condition, the heart rates average was 45.8 beat/min during daytime and 45.0 beat/min at night. The action potentials average was 1.76 $mutextrm{V}$during daytime and 1.75 $mutextrm{V}$ at night. 2. The heart rates average by three levels of electric stimulus were \circled1 In the stimulus condition, the heart rates were 34.9 beat/min during daytime and 33.4 beat/min at night for the 20 Vp level, 36.8 bea/min during daytime and 36.0 beat/min at night for the 30 Vp level, and 38.0 beat/min during daytime and 36.4 beat/min at night for the 40Vp level. \circled2 In the recovery condition, the action potentials were 45.5 beat/min during daytime an 45.1 beat/min at night for the 20Vp level, 47.9 beat/min during daytime and 49.0 beat/min at night for the 30Vp level, and 51.4 beat/min during daytime and 50.7 beat/min at night for the 40Vp level 3. The action potentials average by three levels of electric stimulus were, \circled1 In the stimulus condition, action potentials were 2.54 $mutextrm{V}$ during daytime and 2.39 $mutextrm{V}$ at night for the 20 Vp level, 3.30 $mutextrm{V}$ during daytime and 2.30 $mutextrm{V}$ at night for the 30 Vp level and 6.05 $mutextrm{V}$ during daytime and 3.23 $mutextrm{V}$ at night for the 40 Vp level. \circled2 In the recovery condition, action potentials were 1.92 $mutextrm{V}$ during daytime and 1.95 $mutextrm{V}$ at night for the 20 Vp level and 2.78 $mutextrm{V}$ during daytime and 2.21 $mutextrm{V}$ at night for the 30Vp level and 3.6 0 $mutextrm{V}$ during daytime and 2.98 $mutextrm{V}$ at night for the 40 Vp level.
The Journal of the Korean Society for Microbiology
/
v.21
no.4
/
pp.503-513
/
1986
Previous studies have developed the technique of topical application of tetracycline(TC) into the periodontal pockets and examined the change of clinical parameters and subgingival microbial morphotypes. The purpose of this study was to longitudinally examine the clinical and microbiological effects of topically applied TC in a double-blind and split-mouth design. Thirteen patients with moderate periodontitis, who were treated with or without TC application and scaling treatment, were examined. TC gel(3%) was used to apply into the selected periodontal pockets twice a week for 2 weeks. During the experiment, clinical parameters and subgingival microbial morphotypes were examined, and for isolation of black-pigmented Bacteroides(BPB) and streptococci, an anaerobic sample culturing was done at week 0, 2, and 7. In clinical observation the TC-scaled group exhibited a significant decrease of Gingival Inflammatory Index, Plaque Index, Sulcus Bleeding Index, pocket depth, and gingival crevicular fluid when compared to the TC-unsealed, placebo-scaled, and placebo-unsealed groups. The result of microbial morphotype observation showed a significant increase of coccal form and a decrease of spirochetes in the TC-scaled, TC-unscaled, and placebo-scaled groups. The culture study of streptococci revealed that TC with scaling treatment resulted in a significant increase of S. sanguis I at week 2, but its proportion had returned to the base line level. The anaerobic culture study showed that BPB was significantly reduced in the TC-scaled and TC-unsealed groups at week 7. Among BPB species, B. intermedius declined significantly with time treatment(week 2 and 7) in the TC-scaled and TC-unsealed groups. These results suggest that the settled pathogenic microflora can be succeeded by nonpathogenic microflora in periodontal pockets after TC treatment.
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.21
no.2
/
pp.131-136
/
1985
The calculation of the resulting fluid motion is an important problem of ship hydrodynamics. For a partially immersed body the condition of constant pressure at the free surface can be linearized. The resulting linear boundary-value problem for the velocity potential is the Neumann-Kelvin problem. The two-dimensional Neumann-Kelvin problem is studied for the half-immersed circular cylinder by Ursell. Maruo introduced a slender body approach to simplify the Neumann-Kelvin problem in such a way that the integral equation which determines the singularity distribution over the hull surface can be solved by a marching procedure of step by step integration starting at bow. In the present pater for the two-dimensional Neumann-Kelvin problem, it has been suggested that any solution of the problem must have singularities in the corners between the body surface and free surface. There can be infinitely many solutions depending on the singularities in the coroners.
Seo, Jung-Soo;Lim, Sang-Uk;Kim, Na-Young;Lee, Sang-Hwan;Oh, Hyun-Suk;Lee, Hyung-Ho;Chung, Joon-Ki
Journal of fish pathology
/
v.18
no.1
/
pp.67-80
/
2005
Phosphoinositide-specific phospholipase $C\delta$$PLC\delta$) plays an important role in many cellular responses and is involved in the production of second messenger. The present study was conducted to obtain the biochemical characteristics of the expressed recombinant $PLC\delta$ in E. coli cloned from Misgurnus mizolepis and partially purified $PLC\delta$ enzymes from liver tissues of M. mizolepis (wild ML-$PLC\delta$). The ML $PLC\delta$ gene was cloned and expressed under the previous report (Kim et al., 2004), and purified the recombinant protein by successive chromatography using $Ni^{2+}$-NTA affinity column and gel iltration FPLC column. The wild ML-$PLC\delta$ protein was solublized with 2 M KCI and purified by successive chromatography on open heparin-Sephagel and analytical TSKgel heparin-5PW. Both the recombinant and wild ML-$PLC\delta$ form of protein showed a concentration-dependent PLC activity to phosphatidylinositol 4,5-bis-phosphate (PIP$_2$) or phosphatidylinositol (PI). Its activity was absolutely $Ca^{2+}$- dependant, which was similar to mammalian $PLC\delta$ isozymes. Maximal PI-hydrolytic activations of recombinant and wild ML- TEX>$PLC\delta$ was at pH 7.0 and pH 7.5, respectively. In addition, the enzymatic activities of recombinant and wild ML-$PLC\delta$ were increased in concentration-dependent manner by detergent, such as sodium deoxycholate SDC), phosphatidylethanolamine (PE) and phosphatidylcholine (PC). The activities decreased in contrast by a polyamine, such as spermine. Western blotting showed that several types of $PLC\delta$ isozymes exist in various organs. Taken together our results, it suggested that the biochemical characteristics of ML-$PLC\delta$ are similar with those of mammalian $PLC\delta1$ and ${\delta}3$ isozymes.
In order to gain insight into the physiological responses of plants to high temperature stress, the effects of temperature on Chinese cabbage (Brassica campestris subsp. napus var. pekinensis cv. Detong) were investigated through analyses of photosynthesis and chlorophyll fluorescence under 3 different temperatures in the temperature gradient tunnel. Growth (leaf length and number of leaves) during the rosette stage was greater at ambient $+4^{\circ}C$ and ambient $+7^{\circ}C$ temperatures than at ambient temperature. Photosynthetic $CO_2$ fixation rates of Chinese cabbage grown under the different temperatures did not differ significantly. However, dark respiration rate was significantly higher in the cabbage that developed under ambient temperature relative to elevated temperature. Furthermore, elevated growth temperature increased transpiration rate and stomatal conductance resulting in an overall decrease of water use efficiency. The chlorophyll a fluorescence transient was also considerably affected by high temperature stress; the fluorescence yield $F_J$, $F_I$, and $F_P$ decreased considerably at ambient $+4^{\circ}C$ and ambient $+7^{\circ}C$ temperatures, with induction of $F_K$ and decrease of $F_V/F_O$. The values of RC/CS, ABS/CS, TRo/CS, and ETo/CS decreased considerably, while DIo/CS increased with increased growth temperature. The symptoms of soft-rot disease were observed in the inner part of the cabbage heads after 7, 9, and/or 10 weeks of cultivation at ambient $+4^{\circ}C$ and ambient $+7^{\circ}C$ temperatures, but not in the cabbage heads growing at ambient temperature. These results show that Chinese cabbage could be negatively affected by high temperature under a future climate change scenario. Therefore, to maintain the high productivity and quality of Chinese cabbage, it may be necessary to develop new high temperature tolerant cultivars or to markedly improve cropping systems. In addition, it would be possible to use the non-invasive fluorescence parameters $F_O$, $F_V/F_M$, and $F_V/F_O$, as well as $F_K$, $M_O$, $S_M$, RC/CS, ETo/CS, $PI_{abs}$, and $SFI_{abs}$ (which were selected in this study), to quantitatively determine the physiological status of plants in response to high temperature stresses.
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