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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Korean Society for Biotechnology and Bioengineering
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Volume & Issues
Volume 16, Issue 6 - Dec 2001
Volume 16, Issue 5 - Oct 2001
Volume 16, Issue 4 - Aug 2001
Volume 16, Issue 3 - Jun 2001
Volume 16, Issue 2 - Apr 2001
Volume 16, Issue 1 - Feb 2001
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Hydrophobicity of Microbial Cell Surface and its Applications
KSBB Journal, volume 16, issue 3, 2001, Pages 225~232
The hydrophobicity of the microbial cell surface is responsible for the various interactions between microorganisms and different surface, and results in the flocculation of microbial cells, their adhesion to liquid or solid materials, and the floatation of microorganisms at the air-water interface. Accordingly, cell surface hydrophobicity is important not only in medicine but in other areas of biotechnology. This article reviews the role of cell surface hydrophobicity and its applications.
Removal of Residual Solvents in Paclitaxel by Supercritical Carbon Dioxide
KSBB Journal, volume 16, issue 3, 2001, Pages 233~236
Because of casehardenign effect of amorphous paclitaxel, residual solvents, methylene chloride and emthanol could not be reduced to the maximum value allowed, 600 ppm and 3,000 ppm, in accord with the guidelines issued by the International Conference on Harmonization (ICH, 1997), using rotary evaporation and successive drying in a vacuum oven. However, methylene chloride and methanol were reduced to 486 ppm and 403 ppm, respectively using supercritical
on purified paclitaxel. The optimum pressure and operating time were 80 bar and 30 min at fixed operating temperature (
). This approach serves as a novel application of supercritical fluid extraction to remove residual solvents from active pharmaceutical ingredients.
Effect of VEGF on the Secretion of MMP-2 and Plasmin from Human Keratinocyte Cells
KSBB Journal, volume 16, issue 3, 2001, Pages 237~240
Epithelial cell migration plays an important role in many physiological processes such as morphogenesis and wound healing, and cell mobility requires the release of the cell from its adhesion site. This is directed, at least in part, by limited proteolysis of matrix molecules by matrix metalloproteinases (MMPs). MMPs are zinc-dependent proteases produced by a variety of cell types, and have a fundamental role in tissue remodelling, tumour invasion and metastasis. In addition, the ability of cells to mediate fibrinolytic agent, plasmin. The purpose of this study was to test if vascular endothlial growth factor (VEGF) can regulate the production of MMPs and plasmin by keratinocyte cells. Supernatants from a human keratinocyte cell line grown in the presence or absence of VEGF (10ng/mL) produced ?2.5 fold increases in cell proliferation, and ?3.0 fold increses in MMP-2 and plasmin levels. Our results suggest that VEGF may modulate keratinocyte cell proliferating activity by increasing the abundance of MMP-2 and plasmin, and indicates a role for VEGF in the regulation of keratinocyte behaviour in wound healing and tissue remodelling.
Mass Transfer of Lysozyme Extraction Using Reversed Micelles
KSBB Journal, volume 16, issue 3, 2001, Pages 241~245
Mass transfer rates have been measured for the extraction of enzyme from aqueous solution into a reverse-micelle phase at
. The 420 mL vessel was carefully designed to maintain a planar interface between the aqueous and solvent phases, so allowing precise measurement of interfacial area, has been investigated. Sodium di-2-ethylhexyl sulfosuccinate(AOT) was the surfactant used. Factors varied included: agitator speed, pH, ionic strength and surfactant concentration. Samples were taken from the solvent phase at 15min intervals, and the amount of enzyme extracted was measured by UV absorption at 280 nm. The observed Sherwood numbers for the aqueous phase
were correlated interms of the aqueous phase Reynolds number
, and modified Schmidt number
Isolation of Bacillus sp. AIR-5 PRoducing Maltopentaose Forming Amylase and Optimization of Maltopentaose Production
KSBB Journal, volume 16, issue 3, 2001, Pages 246~252
We isolated a bacterium that produces an extracellular maltopentaose(G5)-forming amylase from amylose and soluble starch. The bacterium was identified and assigned as a Bacillus sp. AIR-5. The amylase did not hydrolyze maltose, maltotriose, maltotetraose or maltopentaose. Optimum medium composition for maltopentaose production in flask culture was 2%(w/v) soluble starch, 0.4%(w/v) tryptone, 0.5%(w/v) NaCl, 0.5%(w/v) K
, and 3 mM CaCl
at pH 8.0, 28
. The highest yield for maltopentaose production in this condition was 6.45 g/L and was 32.55% of theoretical yield.
Transdermal Permeation of Xanthan Gum Bases on the Water-soluble and Lipophilic Antihyperlipoproteinemic Drugs
KSBB Journal, volume 16, issue 3, 2001, Pages 253~258
Recently, there were many studies not only to enhance drug delivery effect but to reduce side effect. Drug delivery system(DDS) is able to improve efficiency with decreasing side effect of drug dosage. Among these application fields, DDS is often used as the method of drug dosage into the epidermic skin. We investigated characters of transdermal therapeutic system(TTS) and the skin permeability of that with applying DDS. We investigated the permeation of xanthan gum containing drug in rat skin using borizontal membrane cell model. Permeation properties of materials were investigated for water-soluble drug with oxiniacic acid and also for lipophilic drug with clofibrate. The permeation rate of lipophilic drug was found to be faster than that of water-soluble drug in vitro. The rate differences of both water-soluble drug and lipophilic drug according to drug content were negligible. We used glycerin, PEG 600 and oleic acid as enhancers. These results showed that skin permeation rate of each drug across the composite was mainly dependent on the property of base and chemical property of drug etc.. Proper selection of the polymeric materials which resemble and enhance properties of the delivering drug was found to be important in controlling the skin permeation rate. This result suggests a possible use of natural polymer base as a transdermal delivery system of antihyperlipoproteinemic agent.
Development of Hollow-fiber Reactor System for the Production of Chiral 1,2-epoxy-7-octene by Microbial Enantioselective Hydrolysis Reaction
KSBB Journal, volume 16, issue 3, 2001, Pages 259~263
The development of hollow fiber reactor system for the production of chiral 1,2-epoxy-7-octence by epoxide hydrolase for Rhodotorula glutinis was investigated. Dodecane with high solubility of the racemic substrate passed through the lumen side of the hollow fiber reactor and cell suspension was recirculated through the shell side. The 2nd hollow fiber reactor was coupled to the production reactor to extract the diol byproduct which was the inhibitor of epoxide hydrolase. Optically pure (S)-1,2-epoxy-7-octene (0.6 M in dodecane) could be obtained using hollow-fiber reactor system.
Studies on the Extraction Efficiency of Polyacetylene from Korean Ginseng
KSBB Journal, volume 16, issue 3, 2001, Pages 264~268
The extraction efficiencies of panaxynol and panaxydol were optimal at 80
with soxhlet method. The extraction efficiencies increased up to 45
with shaking method. Amounts of panaxynol and panaxydol were determined by gas chromatography. Extracted quantities of panaxynol and panaxydol using the shaking method increased over a period of 14 hours. The efficiencies of panaxynol and panaxydol extraction by soxhlet and shaking methods were higher for smaller particle sizes. Upon water swelling treatment, extraction efficiencies of panaxynol and panaxydol decreased gradually with time for both methods.
Purification of Antimicrobial Compounds and Antimicrobial Effects of Schima wallichii subsp. liukiuensis against Candida sp.
KSBB Journal, volume 16, issue 3, 2001, Pages 269~273
To develop natural antimicrobial substances from Theaceae, Schima wallichii subsp. liukiuensis was selected from 218 woody plants, and antimicrobial compounds against bacteria, fungi, and yeast were isolated. The antimicrobial activity of ethanol extracts proved higher than those of other organic solvents. The antimicrobial activity of S. liukiuensis extract showed no differences in sesonal variation, but, that of plant part was high in bark at autumn. An antimicrobial substance was isolated from the extract of Schima using column chromatography packed with silica gel and sephadex LH-20, and then a purified antimicrobial substance (Compound I) was obtained using HPLC analysis. The Compound I in the analysis of UV, IR, and GC-MS presumed a triterpene or steroidal saponin,
-sitisterol as aglycon combined three sugars. The minimal inhibitory concentration (MIC) of the Compound I against a bacteria, fungi, and yeast were 1.25 g/L, 5.0 g/L, and 0.040 g/L, respectively. This is much lower than the MIC of hinokitiol, an natural antimicrobial compound used commercially, which suggests that Compound I could be developed as a natural preservative and pharmaceuticals.
The Development of Serum-Free Media for the Betrovirus Production and Using It in Continuous Production
KSBB Journal, volume 16, issue 3, 2001, Pages 274~280
A serum-free media for CRIP/MFG-LacZ retrovirus production was developed and applied to continuous packed-bed culture system. The serum-free media developed by fractional factorial design contains indulin (
), transferrin (
), BSA (4 mg/mL), EGF (25 ng/mL), and linoleic acid (
). Operation of continuous packed-bed reactor using Fibra-cel enabled the packging cell to stably maintain retrovirus titer for about 1 week. The optimal operation conditions for dilution rate and temperature were 0.67(h(sup)-1) and
, respectively. Using this media, the retrovirus titer(cfu/mL) in the packed continuous culture was about 50% that of continuous culture with serum containing DMEM media.
Effects of Temperature and lncoming Concentrations on the Removal of Volatile Organic Compounds in a Biofilter Packed with Peat
KSBB Journal, volume 16, issue 3, 2001, Pages 281~285
Biofiltration of volatile organic compounds (VOCs) was performed for 80 days in a biofilter packed with peat. The empty bed residence time was 3.2 min. for a gas mixture of isoprene, dimethyl sulfide, chloroform. benzene, trichlorethylene, toluene, m0xylene, o-xylene and styrene. After 34 days of acclimatization the removal efficiency for a 83 g/㎥ gas input was 93% at
and 73% at
, respectively. The maximum cell density at
10(sup)8 cells/g. Removal efficiencies of m-xylene and toluene (91%) were better than that of benzene (86%). The first quarter of the packed column removed 60% of the incoming VOCs.
Effect of Hydrogen Sulfide Removal by Biofilter Seeded with Pseudomonas putida B2
KSBB Journal, volume 16, issue 3, 2001, Pages 286~289
A beterotrophic Pseudomonas putida B2 was used to treat of hydrogen sulfide containing gas. The experimental approach involved operating two indentical bench-scale biofilters with media consisting of a mixture of peatmoss, perlite and granular activated carbon(GAC). One column was seeded with Pseudomonas putida B2 and the other was left unseeded. The biofilter was operated for 16 days under EBRT for 20-40 sec, at a temperature of 25-30
and a hydrogen sulfide concentration of 40-190 ppm. The biofilter inocculated with P.putida B2 exhibited high hydrogen sulfide removal efficiency, average of 95%, at a gydrogen sulfide concentration of 40-190 ppm (flow rate 3.6 L/min). However, at a shock loading of 190 ppm the biofiter showed a removal efficiency of 78.9% and the control only showed a removal efficiency of 31.6%. The critical load of this biofilter was 14.83 g/㎥hr, and the critical load of the control column was 4.93 g/㎥hr. These results suggest that P. putida B2 has the potential to be used as a
removal agent in a biofilter.
A Study on the Denitrification Characteristics of Permeabilized Paracoccus denitrificans
KSBB Journal, volume 16, issue 3, 2001, Pages 290~294
The removal of nitrogen compounds from waste water is essential and is often accomplished by biological process. The denitrifying bacterium, Paracoccus denitrificans (KCTC 2530), was employed to study the characteristics and the denitrification differences of Permeabilized strains and untreated strains. The permeabilization rate increased with increasing toluene concentration, but some part of the toluene contributed to denaturing the datachment of proteins from the plasma membrane. Permeabilized Paracoccus denitrificans had long lag phase and high specific growth rate in cultivation, and showed excellent denitrification characteristic compared with untreated strains. But, in both cases, the denitrification ability was significantly reduced after 4 or 5 denitrifications. It seems that the strains fall into the death phase when the nutrient was exhausted. When the nutrient recovered to its initial level, the denitrification ability also recovered to the normal level. The results obtained were encouraging enough to apply to practical water treatment situation.
Variation of Characteristics on the Surface of Pyrite as Microbial Leaching by Thiobacillus ferrooxidans Progresses
KSBB Journal, volume 16, issue 3, 2001, Pages 295~301
The leaching effect of Thiobacillus ferrooxidance (ATCC 19859) upon polished pyrite ore in 9K medium at
for 30 days was investigated. The surface atomic ratios for Fe, S, Al, Si, and Cu were analyzed by EPMA using fresh and leached samples. The atomic ratio of Fe and S were changed to Fe rich phase as leaching progressed over 13 days but the Fe/S ratio became constant between 13 and 30 days. SEM imaging showed that
oblong shapes formed on the surface after 13 days and that these further developed until 23 days. Fe, S and K atomic ratios were analyzed by SEM-EDS.
Biocompatibility for the Rat of Chitosan
KSBB Journal, volume 16, issue 3, 2001, Pages 302~306
The possibility of biomaterials prepared from natural polymer as a skin substitute was evaluated by measuring biocompatibility. Biodegradable films were prepared by solution blend method in the weight ratio of chitosan for the purpose of useful biomaterials. These films were inserted in the back of rat and their biodegradability was investigated by the film weight and hematology as a function of time for the biotransformation. The result of rat test showed that medium, high viscosity chitosan induced some suspects of inbiocompatibililty in the tissue by foreign body reaction 48 and 72 hours after implantation. Also, we prepared the official burn ointment which is made by low viscosity chitosan. This burn ointment was covered on the skin wound of artificial burn and their effect of healing was investigated by the evaluation of the naked eye and hematological change as a function of time. The result of rats test showed that burn ointments made from chitosan was effective reduction of inflammation than negative group.
Effects and Batch Kinetics of Agitation and Aeration on Submerged Cultivation of Ganoderma Iucidum
KSBB Journal, volume 16, issue 3, 2001, Pages 307~313
The effects of agitaion and aeration on mycelial growth, exo-polysaccharide (EPS) production, and substrate consumption upon the submerged cultivation of G. lucidum were investigated, and the batch kinetics of the EPS fermentation of G. lucidum were interpreted as function of agitation speed and aeration rate. In a 2.6 L jar fermenter system, the optimum agitation speed and aeration rate for EPS production were determined to be 400 rpm and 1.0 vvm, respectively. The maximum production of EPS obtained was 15 g/L. The logistic model for mycelial growth fitted the experimental data better than that determined by the Monod and the two-thirds power models. The Luedeking-Piret equation adequately modelled the kinetic data obtained for product and substrate.
Removal of NH(sub)3-N by Using Immobilized Nitrifier Consortium in PVA[Polyvinyl Alcohol]-I. Effect of Packing Fraction and Aeration Rate on Ammonia Nitrogen Removal
KSBB Journal, volume 16, issue 3, 2001, Pages 314~319
A nitrifier consortium immobilized in polyvinyl alcohol was used to remove ammonia nitrogen from synthetic wastewater in an airlift bioreactor. The minimum aeration rates were 0.4, 0.6, 0.8 and 1.0 vvm for 5, 10, 15 and 20% immobilized bead packing volume fraction, respectively. The efficient packing fraction and the aeration rate for ammonia nitrogen removal were 15% and 2.4 vvm, respectively. With a hydraulic retention time of 0.5hr, the removal rate and the efficiency of ammonia nitrogen removal were 1685 g/㎥
day and 48% at an influent ammonia nitrogen concentration of 75 g/㎥.