• Journal of the Korean Society of Food Science and Nutrition
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• v.17 no.3
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• pp.191-197
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• 1988

Sorption properties of corn starch(CS) and Soy protein isolates(SPI) in plastic films packaging were investigates for binary system. The mixture were sealed in plastic films of low density polyethylene(LDPE), oriented polypropylene(OPP) and LDPE/OPP coated film and packaging effect on the changes of moisture sorption during storage at $40^{\circ}C$ were studied. The following results were obtained. The water vapor permeability of material films was $32.6g/m^2/24hrs(below\;g)$ for 0.02mm LDPE film, 14.01g for 0.04mm LDPE film, 7.30g for 0.02mm OPP film, 3.37g for 0.04mm OPP film and 4.869 for 0.02mm LDPE/0.02 mm OPP confine film at $40^{\cire}C$ 90%RH, therefore the OPP film was more effective than LDPE film on the resistance of relative humidity. And the OPP film packaging sealed mixture of food samples was also more elective then LDPE film, having same thickness for increase of water vapor permeability during storage at $40^{\cire}C$. A general increase in sorption rate was found more in SPI than CS in the packaged mixtures.

• The monthly packaging world
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• s.148
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• pp.68-71
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• 2005

• The monthly packaging world
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• s.92
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• pp.141-143
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• 2000

• The monthly packaging world
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• s.130
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• pp.74-79
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• 2004

• The monthly packaging world
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• s.165
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• pp.80-81
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• 2007

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.112-112
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• 2018

산마늘은 마늘과 같이 독특한 향이 있어 입맛을 돋우며 웰빙식품으로 3월 중순에서 5월초에 채취하여 생채로 쌍을 먹거나 김치, 절임으로 생산되어 판매된다. 산마늘의 부가가치 향상을 위하여 살균소독 세척과 소포장용 필름포장방법을 구명하고자 본 실험을 수행하였다. 산마늘을 살균소독 세척수(수돗물, 0.2% 구연산 침지 후 50% 에탄올 분무처리)로 2분 세척하고 원심탈수 후, 포장필름은 $30{\mu}m$ oriented polypropylene (OPP), $30{\mu}m$ OPP 필름을 기본재료로 산소투과율 $5,000cc/m^2{\cdot}day{\cdot}atm$ (OPP_5)로 조정한 필름, $30{\mu}m$ micro perforated polypropylene (MPP) 필름에 밀봉하고, $30{\mu}m$ OPP필름에 개봉 포장하여 $4^{\circ}C$에서 42일 저장하였다. 산마늘은 구연산 침지 후 에탄올 분무세척 후 세척 전 보다 일반세균수가 1.5 log CFU/g 감소되었으며 수돗물 세척 후는 0.1 log CFU/g 정도 감소하여 수돗물 보다 구연산 침지 후 에탄올 분무에 의해 균수 감소효과가 보다 컸으며 저장기간이 경과한 후에도 그러한 경향은 유지되었다. 저장 35일 후 세척수에 관계없이 OPP 개봉과 MPP 밀봉 포장에서 의해 산마늘의 황화율과 부패율이 높게 나타났으며 OPP 밀봉에서 이취 발생 지수가 OPP_5 밀봉보다 높게 나타났다. 세척 및 포장처리에 의한 종합선도의 제한요인은 황화, 이취 및 부패취 발생 지수로 이를 종합하였을 때 산마늘의 상품성 향상을 위하여 소포장 하는 경우 구연산 침지 후 에탄올 분무 방법으로 세척한 다음 원심탈수하여 OPP_5필름으로 포장하는 것이 품질 향상에 적합하였으며 40일 이상 저장이 가능한 것으로 나타났다.

• Current Optics and Photonics
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• v.8 no.3
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• pp.259-269
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• 2024

Optical imaging systems that operate through atmospheric pathways often suffer from image degradation, mainly caused by the distortion of light waves due to turbulence in the atmosphere. Adaptive optics technology can be used to correct the image distortion caused by atmospheric disturbances. However, there are challenges in conducting experiments with strong atmospheric conditions. An optical phase plate (OPP) is a device that can simulate real atmospheric conditions in a lab setting. We suggest a novel two-step process to fabricate an OPP capable of simulating the effects of atmospheric turbulence. The proposed fabrication method simplifies the process by eliminating additional activities such as phase-screen design and phase simulation. This enables an efficient and economical fabrication of the OPP. We conducted our analysis using the statistical fluctuations of the refractive index and applied modal expansion using Kolmogorov's theory. The experiment aims to fabricate an OPP with parameters D/r₀ ≈ 30 and r₀ ≈ 5 cm. The objective is defined with the strong atmospheric conditions. Finally, we have fabricated an OPP that satisfied the desired objectives. The OPP closely simulate turbulence to real atmospheric conditions.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.17 no.1
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• pp.1-5
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• 2011

Soybean sprouts of 100 g were packed with commercial OPP/PE films and developed PLA films, and stored at $10^{\circ}C$ for 6 days. Effects of packaging film were investigated. The weight loss of OPP/PE film was higher than that of the PLA film. Total cell count of PLA2 and PLA3 packages was the lowest among 5 packages. Off-flavor was strong at OPP/PE, but that in PLA2 was very little. Vitamin C content of PLA2 was highest and preference test of PLA2 was also highest among 5 packages. Finally, the PLA packages for soybean sprouts was more suitable than OPP/PE.

• Journal of Veterinary Science
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• v.21 no.6
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• pp.88.1-88.13
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• 2020

Background: Listeria monocytogenes is a gram-positive bacterium that causes listeriosis mainly in immunocompromised hosts. It can also cause foodborne outbreaks and has the ability to adapt to various environments. Peptide uptake in gram-positive bacteria is enabled by oligopeptide permeases (Opp) in a process that depends on ATP hydrolysis by OppD and F. Previously a putative protein Lmo2193 was predicted to be OppD, but little is known about the role of OppD in major processes of L. monocytogenes, such as growth, virulence, and biofilm formation. Objectives: To determine whether the virulence traits of L. monocytogenes are related to OppD. Methods: In this study, Lmo2193 gene deletion and complementation strains of L. monocytogenes were generated and compared with a wild-type strain for the following: adhesiveness, invasion ability, intracellular survival, proliferation, 50% lethal dose (LD₅₀) to mice, and the amount bacteria in the mouse liver, spleen, and brain. Results: The results showed that virulence of the deletion strain was 1.34 and 0.5 orders of magnitude higher than that of the wild-type and complementation strains, respectively. The function of Lmo2193 was predicted and verified as OppD from the ATPase superfamily. Deletion of lmo2193 affected the normal growth of L. monocytogenes, reduced its virulence in cells and mice, and affected its ability to form biofilms. Conclusions: Deletion of the oligopeptide transporter Lmo2193 decreases the virulence of L. monocytogenes. These effects may be related to OppD's function, which provides a new perspective on the regulation of oligopeptide transporters in L. monocytogenes.

• The monthly packaging world
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• s.268
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• pp.52-55
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• 2015