Journal of the Korean Society of Food Science and Nutrition
/
v.38
no.2
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pp.182-187
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2009
Physicochemical and organoleptic characteristics of omija wines made by traditional method, adding grape juice and sugar solution periodically, and with dry omija were compared. The pH values of all omija wines were ranged $2{\sim}3$ during fermentation. The acidity value of omija wine made by traditional method was 2.5%, that of omija wine made by adding grape juice and sugar solution periodically decreased from 3.3% to 0.8%, and that of omija wine made with dry omija increased from 0.2% to 3.9%. Sucrose and alcohol contents were $6.5{\sim}34.5^{\circ}Brix$ and 12% at the end of fermentation, respectively. The viable cell numbers of yeast decreased from $5.7{\sim}6.9\;\log\;CFU/mL$ to $4.3{\sim}4.6\;\log\;CFU/mL$. Omija wine made by adding grape juice and sugar solution periodically had the highest sensory scores for color, taste, flavor, swallowing, and overall acceptability, and was significantly different from the both omija wines made by traditional method and with dry omija. Because omija is rarely fermented due to the little fermentative sugar content, omija wine made by adding grape juice and sugar solution periodically was shown to be the most appropriate.
Flow cytometry (FCM) was used to measure the ploidy level of three different sports from 'Campbell Early' ($Vitis$$labruscana$) grape. Results of the study showed different ploidy levels. FCM analysis for 'Campbell Early' grape which contains 2C DNA diploid cells showed single peak around 35-40 while 'Kyoho' grape with 4C DNA tetraploid cells had a different level of 70-80. However, analysis of the sports displayed a histogram with 2 peaks containing both 2C and 4C nuclei. There was no difference in histograms of 2C DNA flesh and pericarp; on the other hand, 4C DNA flesh type of sports had a different histogram from that of the 2C DNA pericarp. Chromosome numbers of diploid ('Campbell Early'), tetraploid ('Kyoho'), and three sports were counted under the microscope. 'Campbell Early' and 'Kyoho' have 38 and 76 chromosomes, respectively. Three different sports are mixoploids with mixtures of diploid and tetraploid cells. Microscopic observations of shoot apical meristems in sports from 'Campbell Early' grape were carried out to determine the type of plant chimera. 'Campbell Early' grape (diploid) and 'Kyoho' grape (tetraploid) showed that both had 2 tunica layers covering corpus cells, while the three different sports had tunica layers showing mostly oblique division. Most cells from 'Kyoho' grape were larger than 'Campbell Early' grape. Cells from L-2 and L-3 layers of the three sports were similar to 'Kyoho' grape in size, although all cells in L-1 surface layer were uniform in size like 'Campbell Early' grape. Results of FCM analysis indicated that both normal and polyploid cells could be intermixed in sports and could become mixoploidy consisting of diploid and tetraploid. All sports used in the tests were periclinal chimera plants with two distinct L-1 and L-2 cell layers. The result of this study suggests that all three sports which originated from 'Campbell Early' grape might be 2-4-4 type chimera formation.
A study on the biological and chemical characteristics in the middle last Sea of Korea was carried out at 31 stations in October $11\~18$, 1995 on board the R/V Tam-Yang. The chlorophyll a concentration, new and regenerated production, and the vertical diffusion of nitrate from the thermocline structure were investigated. From the vertical distribution of chlorophyll a, subsurface maxima were observed near the thermorline at most stations including the frontal zone, except at the southern stations where the maximum chloropyll a concentration occurred at the surface, The nanophytoplankton was the most dominant fraction comprising $83.5\%$ of total phytoplankton cell numbers, but netphytoplankton were common at the southern stations where the dominant species were Rhizosolenia sp. Nitrogenous new production and regenerated productions were measured using the stable isotope $^{15}N$ nitrate and ammonia uptake method. The vertically integrated nitrogen production varied between 8.470 and $72.945\;mg\;N\;m^{-2}\;d^{-1}$. The f-ratio, which is the traction of new production from primary production, waried between 0.03 and 0.72, indicating that $3\%$ to $72\%$ of primary production was supported by the input of nutrients from below the euphotic zone and the rest are supported by ammonia recycled within the euphotic layer. This range of f-ratio encompasses from extremely oligotrophic to eutrophic area characteristics. The differences in productivity and f-ratio among stations were related to frontal structure and the bottom topography. The values were high near the frontal zone and low outside of it, and the station near Ulleng Island showed the highest f-ratio. Vertical diffusion coefficients were calculated from both the water column stability (Kz-1) of King and Devol's equation (1979) and new nitrogen requirement (Kz-2). The values of Kz-2 ($0.11\~0.55\;cm^2/s$) were relatively low compared to the values reported previously.
Paralytic shellfish poison(PSP) accmulate in shellfish as a result of feeding toxic dinoflagellates. The shellfish do not seem to be harmed by the toxins, but become toxic to humans and other animals that feed on them. The purpose of this study was to investigate the distribution and changes of PSP by species of shellfish, collected area and collected month. Also, the correlation between PSP and toxic dinoflagellate, Protogonyaulax tamarensis, was investigated. Five hundred and six samples of 13 kinds of shellfish for PSP bioassay were collected at the shellfish growing area of Pusan, Masan, Chungmu, $Samch\check{o}npo, Y\check{o}su, Mokpo and Daech\check{o}n$ located in South Korea during the study period from May, 1985 to Octcber, 1987. Most of the samples submitted were free from PSP except sea mussel, short - necked clam and ark shell. Among the intoxicated samples, PSP was most often detected in sea mussel. PSP was detected mainly in spring$(February\~May)$ in the southern coast of Korea. In case of Pusan, exceptionally, toxic sea mussel have been found even June and July in 1987. The toxicity score of toxic shellfishes examined was ranged from 23.44 to $150.26{\mu}g/100g$ of edible meat and toxicity of sea mussel was higher than other toxic shellfishes. By the study of anatomical distribution of PSP in sea mussel collected at Masan in Febuary and March, 1986, the toxin accumulated in digestive gland was about $70\%$ of all. There was no significant correlation between toxicity of sea mussel and cell numbers of P. tamarensis that one of the causitive organism of PSP during the studying period in Masan area. There was almost no difference in toxicity of sea mussel by water depth of collection, but toxicity of surface shellfish was a little higher than those of 3.5, and 7.0m depth.
For large and rapid screening of high-yielding mutants of lovastatin produced by filamentous fungal cells of Aspergillus terreus, one of the most important stage is to test as large amounts of mutated strains as possible. For this purpose, we intended to develop a miniaturized cultivation method using $7m{\ell}$ culture tube instead of traditional $250m{\ell}$ flask (working volume $50m{\ell}$). For obtaining large amounts of conidiospores to be used as inoculums for miniaturized cultures, 4 components i.e., glucose, sucrose, yeast extract and $KH_2PO_4$ were intensively investigated, which had been observed to show positive effect on enhancement of spore production through Plackett-Burman design experimet. When optimum concentrations of these components that were determined through application of response surface method (RSM) based on central composite design (CCD) were used, maximum spore numbers amounting to $1.9\times10^{10}$ spores/plate were obtained, resulting in approximately 190 fold increase as compared to the commonly used PDA sporulation medium. Using the miniaturized cultures, intensive strain development programs were carried out for screening of lovastatin high-yielding as well as highly reproducible mutants. It was observed that, for maximum production of lovastatin, the producers should be activated through 'PaB' adaptation process during the early solid culture stage. In addition, they should be proliferated in condensed filamentous forms in miniaturized growth cultures, so that optimum amounts of highly active cells could be transferred to the production culture-tube as reproducible inoculums. Under these highly controlled fermentation conditions, compact-pelleted morphology of optimum size (less than 1 mm in diameter) was successfully induced in the miniaturized production cultures, which proved essential for maximal utilization of the producers' physiology leading to significantly enhanced production of lovastatin. As a result of continuous screening in the miniaturized cultures, lovastatin production levels of the 81% of the daughter cells derived from the high-yielding producers turned out to be in the range of 80%$\sim$120% of the lovastatin production level of the parallel flask cultures. These results demonstrate that the miniaturized cultivation method developed in this study is efficient high throughput system for large and rapid screening of highly stable and productive strains.
Journal of the korean academy of Pediatric Dentistry
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v.33
no.4
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pp.661-672
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2006
This study was performed to compare the shear bond strength of AQ Bond $Plus^{TM}$ with AQ $Bond^{TM}$ and Single $Bond^{TM}$. Also by observing the fractured interface under scanning electro-microscope, the fracture pattern and the quality of hybrid layer were analyzed. The possibility of clinical application of all-in-one system which has an advantage to reduce chair time for children with difficult behavior pattern was evaluated, The results obtained are as follows ; 1. There was no significant difference between AQ $Bond^{TM}$ and AQ Bond $Plus^{TM}$ in shear bond strength and Single Bond showed the highest bond strength with statistical significant difference (p<0.05). 2. Adhesive fracture pattern was mainly observed in both enamel/dentin in AQ $Bond^{TM}$ and AQ Bond $Plus^{TM}$ group while Single Bond group showed equal numbers for cohesive and adhesive pattern. 3. Under scanning electro-microscope, resin tags observed in AQ $Bond^{TM}$ and AQ Bond $Plus^{TM}$ were very weak and tangled while strong and thick tags were shown with many lateral branches in Single Bond. Careful case selection and accurate clinical application is recommended when using AQ $Bond^{TM}$ and AQ Bond $Plus^{TM}$considering the result showing its weaker strength than Single $Bond^{TM}$.
This study was conducted to evaluate the quality of barley (Huinchalssalbori) and domestic wheats (Keumkangmil, Baegjoongmil, Jogyeongmil). The pH and total acidity of mixed Makgeolli were 4.04~4.12% and 0.94~1.06%, respectively. The total acidity, sugar and alcohol contents of Makgeolli, but not pH, varied significantly by wheat cultivar (p<0.05). In terms of color values, the L-value of Baegjoongmil, a-value and b-value of Keumkangmil were highest. The reducing sugar contents was approximately 5.65~7.85 mg/mL, and those of Jogyeongmil and imported wheat were approximately 5.70 mg/mL lower. The yeast cell numbers did not differ significantly, with the exception of in the rice Makgeolli (p<0.05). Among the organic acids (citric, malic, pyruvic and lactic acids) in Makgeolli, citric acid was present at the highest concentration. Regarding the sensory characteristics of Makgeolli mixed with barley and wheat, taste and overall acceptability were highest in Baegjoongmil, and appearance and flavor were highest in Keumkangmil. The rice Makgeolli showed the lowest sensory values, with the exception of appearance. The results of this study suggest that mixing Makgeolli with barley and wheat is an expected to replace the wheat materials in the domestic wheat to be imported.
The aim of this study was to clarify the role of Kupffer cells in the mechanism of endotoxin-induced liver injury. The study on fine structure of Kupffer cells was performed after the injection of endotoxin. The endotoxin(Escherichia coli lipopolysaccharide 026 : B6. 1.5mg/100 g of body weight) was intraperitoneally injected in Sprague-Dewley rats. Animals were sacrificed at 1/4, 1/2, 1, 2, 4, 8, 16, 24, 72 and 120 hours after the injection of endotoxin. Livers were extirpated and processed to be examined by light and electron microscopy. The results obtained were summerized as follows: Early changes observed in liver after endotoxin injection included the increased number and hypertrophy of Kupffer cells, infiltration of neutrophils and presence of fibrin thrombi within the sinusoids. The continuous increase of the Kupffer cells in number with hypertrophy, congestion and infiltration of inflammatory cells within the sinusoids were observed. Hepatocytes showed fatty change and occasional necrosis. At 72 hours the congestion decreased. At 120 hours the number of Kupffer cells was increased, but the morphology of Kupffer cells became similar to that of the control group. The numbers and sizes of primary and secondary lysosomes and amount of euchromatin of Kupffer cells increased. Swellings and increase in number of mitochondria, Golgi complex, smooth endoplasmic reticulum, rough endoplasmic reticulum were evident. Microthrombi were present within the sinusoids. The swelling of rough endoplasmic reticulum and mitochondria, decrease of glycogen particles, fatty change, hypoxic vacuoles, pyknotic nuclei and occasional necrosis were observed in hepatocytes. At 72 hours the number of secondary lysosomes in Kupffer cells decreased. At 120 hours the morphology of Kupffer cells became similar to that of the control group. According to these results, it was postulated that the endotoxin was initially taken up by pinocytosis into Kupffer cells and degraded in secondary lysosomes of activated Kupffer cells. Kupffer cells may play an important role in the defense mechanism of liver during endotoxemia. The dysfunction of Kupffer cells and ischemia by sinusoidal microthrombi may cause liver injury.
Purpose : To evaluate the qualitative immunologic changes by ionizing radiation. we studied the altered capacities of the macrophages and lymphocytes to produce cytokines in conjunction with resistance to Listeria monocytegenes (LM) infection in mice Materials and Methods : BALB/c mice and Listeria monocytogenes were used. The mice were infected intraperitoneally with $10^5LM$ at 1 day after irradiation (300cGy) and sacrificed at 1, 3, 5 days after infection, and then the numbers of viable LM per spleen in the irradiated and control group were counted. Tumor necrosis factor-alpha ($TNF-\alpha$), interferon-gamma ($IFN-\gamma$). interleukin-2 (IL-2), and nitric oxide (NO) were assessed after irradiation. Results : Under gamma-ray irradiation with a dose range of 100-850cGy, the number of total splenocytes decreased markedly in a dose-dependent manner, while peritoneal macrophages did so slightly Cultured peritoneal macrophages produced more $TNF-\alpha$ in the presence of lipopolysaccharide (LPS) during the 24 hours after in vitro irradiation, but their capacity of $TNF-\alpha$ Production showed a decreased tendency at 5 days after in vivo total body irradiation. With 100cGy and 300cGy irradiation, cultured peritoneal macrophages produced more NO in the presence of LPS during the 24 hours after in vitro irradiation than without irradiation. Activated splenocytes from irradiated mice (300cGy) exhibited a decreased capacity to Produce IL-2 and $IFN-\gamma$ with Concavalin-A stimulation at 3 days after irradiation. When BALB/c mice were irradiated to the total body with a dose of 300cGy, they showed enhanced resistance during early innate phase, but a significant inhibition of resistance to LM was found in the late innate and acquired T-cell dependent phases. Conclusion : These results su99es1 that increased early innate and decreased late innate and acquired immunity to LM infection by ionizing radiation (300cGy) may be related to the biphasic altered capacity of the macrophages to produce $TNF-\alpha$ and the decreased capacities of the lymphocytes to produce IL-2 and $IFN-\gamma$ in addition to a marked decrease in the total number of cells.
The present study was conducted to find the effects of different cadmium(Cd) levels in diets on clinical toxicity, sperm capacity and histopathological changes in rats. Thirty male rats of Sprague-Dawley weighing 125.3$\pm$15.2g were randomly blocked into five groups according to body weights. Five levels of Cd in AIN-76 purified diet(0, 25, 50, 100 and 250 ppm) had been fed for 8 weeks. Cadmium was supplemented with a form of CdCl$_2$. 1. After 8 weeks of Cd intake had resulted in apparent cadmium intoxication; reduced growth rate, enlarged kidney and testis, decreased hematocrit value and hemoglobin content in response to supplemented Cd levels in the diets. 2. Cadmium accumulation in liver and kidney showed a tendency to increase in cadmium-exposed groups. The levels of metallothionein were also significantly elevated in the tissues of liver in response to the levels of Cd supplemented(P<0.05). 3. Although sperm motility was not significantly different among treatments, rats fed Cd tended to have reduced sperm motility but sperm concentration of Cd supplemented groups were significantly lower than that of control(p<0.05). 4. Based on the findings from gross lesion, rats fed 250ppm of Cd were externally emaciated, had exposed penis and observed atrophies of kidney and testis. Histopathological observation seemed that the liver of groups feeding Cd supplemented diets showed cellular degeneration and accumulation of eosinophilic materials in the capillaries. In kidney, rats fed Cd diets had shown tubular epithelium degeneration and lesions of basophilic materials, while testes were weakened in numbers of spermatid and sporadically enlarged of giant cells.
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