• Proceedings of the Korean Society of Veterinary Pathology Conference
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• 2002.11a
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• pp.9-9
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• 2002

Grossly, the liver exhibits marked cirrhotic changes characteristics of the pre-transformation phase of WHV. Microscopically, focal hepatocyte necrosis and inflammatory cells were observed in midzonal and periportal areas. Bridging portal fibrosis produced pseudolobulation due to entrapment of hyperplastic hepatocytes. Biliary hyperplasia, ductal cell proliferation, and increased amounts of fibrous connective tissue expanded portal areas and extended into periportal areas. Myofibroblasts stained positive for -SMA were detected in proliferating fibrotic tissue and sinusoids.

• Journal of Microbiology and Biotechnology
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• v.21 no.12
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• pp.1250-1256
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• 2011

In this study, Bacillus licheniformis cells were immobilized by entrapment in calcium alginate beads and were used for production of alkaline protease by repeated batch process. In order to increase the stability of the beads, the immobilization procedure was optimized by statistical full factorial method, by which three factors including alginate type, calcium chloride concentration, and agitation speed were studied. Optimization of the enzyme production medium, by the Taguchi method, was also studied. The obtained results showed that optimization of the cell immobilization procedure and medium constituents significantly enhanced the production of alkaline protease. In comparison with the free-cell culture in pre-optimized medium, about 7.3-fold higher productivity was resulted after optimization of the overall procedure. Repeated batch mode of operation, using optimized conditions, resulted in continuous production of the alkaline protease for 13 batches in 19 days.

• Microbiology and Biotechnology Letters
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• v.20 no.4
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• pp.459-469
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• 1992

The immobilization characteristics of Zymomonas mobilis for ethanol production were examined. Four different strains of Zymomonas mobilis have been used for ethanol production. Among those, Zymomonas mobilis KCTC 1534 has been selected as the best strain for the highest ethanol productivity from glucose and sucrose. The optimum temperature and pH of the selected strain for ethanol production were $37^{\circ}C$ and 5.0 respectively for both free and immobilized cells. When the cells were immobilized by the gel entrapment method, the immobilized cells could produce ethanol at a little higher temperature than free cells. Calcium alginate was selected as the best gel for immobilizing cells. The immobilized cells could maintain the viability of 80% in 10 weeks storage at $4^{\circ}C$ in the medium with 2% calcium chloride. 20-25 hours of preincubation in 10% glucose solution was required for the activation of immobilized cells entrapped within calcium alginate gel.

• KSBB Journal
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• v.17 no.6
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• pp.531-536
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• 2002

In this study, we attempted to increase the survivability of bifidobacteria in simulated gastric juices and bile salts after cell entrapment with alginate and various food additives, such as erythritol, isomalt, palatinose, skim milk, xanthan gum, isomalto-oligosaccharide, fructo-oligosaccharide, galacto-oligosaccharide, pectin, and mono-sodium glutamate. Additionaly, the stability of bifidobacteria during storage was investigated by measuring survival rate at different temperatures, i.e. at 4$^{\circ}C$, 25$^{\circ}C$ and -20$^{\circ}C$. Bifidobacteria were immobilized in alginate beads and the survival rate was monitored. It was found that bifidobacieria entrapped with 2.5％, alginate showed the highest survival rate at 12%. After addition of the various protective agents, erythritol(1％) showed the best protective efficiency with a survival rate of 56.0% among the additives tested when exposed to simulated gastric juices for 3 h. Immobilized cells suspended in 5% skim milk and stored at 4$^{\circ}C$ survived significantly more than cells stored at 25$^{\circ}C$ and -20$^{\circ}C$. Consequently, the study shows that the survival rate of bifidobacteria immobilized in combination with 2.5% alginate beads and 1% erythritol may be signifcantly increased in simulated gastric juices and bile salts.

• The Korean Journal of Food And Nutrition
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• v.11 no.3
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• pp.319-322
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• 1998

The whole cell of alkalophilic Streptomyces sp. B-2 which produce glucose isomerase was immobilized by entrapment method for the effective production of high fructose syrup. The highest immobilized activity was achieved when the enzyme was bound to 2% $textsc{k}$-carrageenan. Immobilized glucose isomerase the pH optimum was about pH 7.5~8.5. Immobilization of alkalophilic Streptomyces sp. B-2 on 2% $textsc{k}$-carrageenan at 7$0^{\circ}C$ showed an increase in glucose isomerase activity. GI activity of immobilized cells was maximum Co2+ concentration 10-3M, Mg2+ concentration 10-3M.

• The Korean Journal of Food And Nutrition
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• v.2 no.2
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• pp.14-20
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• 1989

A strain of Saccharomyces cerevisiae BY-366 was isolated to produce a strong sucrose-hydrolyzing enzyme. After entrapment of yeast cell invertase with alginate, enzymatic properties of immobilized cells were investigated. The results are as follows. 1. The optimum pH of invertase in immobilized cells and non- immobilized cells was 6.0 and 5.0, and pH stability of invertase in immobilized cells and non- immobilized cells was 6.0 and 5.0, respectively. 2 Activation energy of immobilized cells was 4.7 kcal/mol. 3 The immobilized preparation exhibited high resistance to heat and urea Induced denaturation. 4, The bead size less than 2 mm in diameter was desirable. 5. In spite of repeated use, the enzyme activity of immobilized cells was inhibited slightly in batch reaction, and a small column of the immobilized preparation could hydrolyze relatively high concentration of sucrose almost quantitatively to more than 6 days.

• Journal of Microbiology and Biotechnology
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• v.12 no.5
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• pp.735-739
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• 2002

Large quantities of porcine hepatocyte aggregates with various degrees of aggregation (DA) could be obtained by controlling the suspension periods (0,9,24, and 48 h), and by entrapping the hepatocyte aggregates in model materials of encapsulation such as Ca-alginate and type-I collagen gels. The effects of DA on liver-specific functions of hepatocytes were evaluated in order to obtain optimum DA for the cell source of bioartificial liver (BAL) systems. Irregular rugged aggregates (size $75 \pm 28$ $\mu\textrm{m}$) farmed by 24 h of suspension culturing showed peak viability and hepatic functions such as ammonia removal and albumin secretion in the two types of entrapment systems, thus offering themselves as a stable cell source of a BAL system for hepatic functions and scale-up.

• Journal of Microbiology and Biotechnology
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• v.19 no.12
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• pp.1635-1643
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• 2009

The aim of this study was to provide new insight into the mechanism whereby the housekeeping enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH) locates to cell walls of Lactobacillus plantarum 299v. After purification, cytosolic and cell wall GAPDH (cw-GAPDH) forms were characterized and shown to be identical homotetrameric active enzymes. GAPDH concentration on cell walls was growth-time dependent. Free GAPDH was not observed on the culture supernatant at any time during growth, and provoked cell lysis was not concomitant with any reassociation of GAPDH onto the cell surface. Hence, with the possibility of cw-GAPDH resulting from autolysis being unlikely, entrapment of intracellular GAPDH on the cell wall after a passive efflux through altered plasma membrane was investigated. Flow cytometry was used to assess L. plantarum 299v membrane permeabilization after labeling with propidium iodide (PI). By combining PI uptake and cw-GAPDH activity measurements, we demonstrate here that the increase in cw-GAPDH concentration from the early exponential phase to the late stationary phase is closely related to an increase in plasma membrane permeability during growth. Moreover, we observed that increases in both plasma membrane permeability and cw-GAPDH activity were delayed when glucose was added during L. plantarum 299v growth. Using a double labeling of L. plantarum 299v cells with anti-GAPDH antibodies and propidium iodide, we established unambiguously that cells with impaired membrane manifest five times more cw-GAPDH than unaltered cells. Our results show that plasma membrane permeability appears to be closely related to the efflux of GAPDH on the bacterial cell surface, offering new insight into the understanding of the cell wall location of this enzyme.

• Macromolecular Research
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• v.17 no.12
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• pp.969-975
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• 2009

This article describes the topical delivery and localization of budesonide through the hairless mouse skin. Two poly(ethylene oxide)-block-poly($\varepsilon$-caprolactone)-block-poly(ethylene oxide) (PEO-PCL-PEO) triblock copolymers (T 222 and T 252) having different CL:EO ratios were added in the preparation of budesonide particles stabilized with poly(vinyl alcohol) (PVA) and Tween 80 under ultrasonication. For comparison, a commercial PEO-PPO-PEO triblock copolymer (F68) was studied under the same condition. To demonstrate the effects of the triblock copolymer, the particle size of budesonide emulsion, entrapment efficiency, and in vitro release were measured and compared. The budesonide particles stabilized by the triblock copolymers had a diameter of ca. 350 nm with entrapment efficiencies of 66-76%. The In vitro release profiles of all samples showed an initial burst followed by sustained release. The skin penetration and permeation of budesonide were analyzed by using a Frantz diffusion cell. T 222 and T 252 exhibited higher total permeation amounts, but lower budesonide penetration amounts, than F68. The results suggest that the partitioning of budesonide in each skin layer can be adjusted in order to avoid skin thinning and negative immune response arising from the penetration of budesonide in blood vessels.

• Anatomy and Cell Biology
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• v.57 no.1
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• pp.143-146
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• 2024

The current cadaveric report describes an unusual morphology of the sartorius muscle (SM), the biceps-bicaudatus variant. The SM had two (lateral and medial) heads, with distinct tendinous origins from the anterior superior iliac spine. The lateral head was further split into a lateral and a medial bundle. The anterior cutaneous branch of the femoral nerve emerged between the origins of the lateral and medial heads. SM morphological variants are exceedingly uncommon, with only a few documented cases in the literature, and several terms used for their description. Although their rare occurrence, they may play an important role in the differential diagnosis of entrapment syndromes, in cases of neural compressions, such as meralgia paresthetica, while careful dissection during the superficial inter-nervous plane of the direct anterior hip approach is of utmost importance, to avoid adverse effects due to the altered SM morphology.