• Title/Summary/Keyword: Biological and physical properties

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Studies on the Chemical Components of Citrus Junos Sieb and Physical and Chemical Properties of Citrus Jumes Sieb Orchard Soil (유자(柚子)의 화학적성분(化學的咸分)과 유자원토양(柚子園土壤)의 이화학적성질(理化學的性質)에 관(關)한 연구(硏究))

  • Chung, J.H.
    • Applied Biological Chemistry
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    • v.15 no.2
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    • pp.169-173
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    • 1972
  • In five varietes of Citrus junos sieb grown in different area in Korea, the general components, total acids and inorganic components were calculated and compared with one other. In the orchard soils, the physical and chemical properties were studied. The results are summarized as follow: 1. Generally, the rind was weighter than tile flesh compared with the other fruits and the proportion of the rind was 49%. 2. Total contents of organic acids in rind and flesh were 12.29me and 39.79me respectively. 3. The order of the contents of inorganic components in the flesh and rind was $CaO>K_2O>MgO>P_2O_5>SO_4$ 4. The contents of crude protein and crude fat were increased with those of MgO and $SO_4$ in fruits. 5. The quantity of protein in the soil seed to influence greatly in rind formation not only in citrus fruits but also Citrus junos sieb. 6. In growing Citrus junos sieb, C.L. seemed to he the most adequate soil. 7. The pH range of the soil was from 5.05 to 7.20 generally. 8. The contents of crude protein and crude fat in citrus fruits seemed to be increased with those of organic material and total-nitrogen in the soil.

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A Study of Ecotourism Activated Gede Pangrango National Park in Indonesia (인도네시아 그데 빨랑오(Gede Pangrango) 국립공원의 생태관광 활성화방안 연구)

  • Jeong, Kyongyeon;Byun, Byungseol
    • Journal of Wetlands Research
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    • v.15 no.1
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    • pp.139-147
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    • 2013
  • This study is thing about eco-tourism activated Mt. Gede Pangrango National Park in Indonesia. Indonesia is full of eco-tourist resources with the possession of the tropical forest. Particularly, Gede Pangrango National Park on the west of Java island has so plenty of bio-diversity that the UNESCO designated this park as the World Biosphere Reserve. By virtue of this, various visitors all over the world are visiting Gede Pangrango Park for doing research, education, hiking and camping. However, Indonesia lags behind other countries in convenience facilities for visitors, so their visiting programs are actually insufficient. In order for eco-tourism to be revitalized, there should be physical improvement in visiting facilities, management of a variety of visit programs, and local residents' participation & projects to increase the income of local residents. This study is going to seek for the environment-friendly management plan suited for the properties of the park and improvement plan for eco-visiting facilities by closely grasping the actual condition of the eco-tourism of Gede Pangrango National Park.

Real-time Monitoring of Environmental Properties at Seaweed Farm and a Simple Model for CO2 Budget (해조양식장 수질환경 모니터링을 통한 이산화탄소 단순 수지모델)

  • Shim, Jeong Hee;Kang, Dong-Jin;Han, In Sung;Kwon, Jung No;Lee, Yong-Hwa
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.17 no.4
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    • pp.243-251
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    • 2012
  • Real-time monitoring for environmental factors(temperature, salinity, chlorophyll, etc.) and carbonate components( pH and $fCO_2$) was conducted during 5-6th of July, 2012 at a seaweeds farm in Gijang, Busan. Surface temperature and salinity were ranged from $12.5{\sim}17.6^{\circ}C$ and 33.7~34.0, respectively, with highly daily and inter-daily variations due to tide, light frequency(day and night) and currents. Surface $fCO_2$ and pH showed a range of $381{\sim}402{\mu}atm$ and 8.03~8.15, and chlorophyll-a concentration in surface seawater ranged 0.8~5.8 ${\mu}g\;L^{-1}$. Environmental and carbonate factors showed the highest/lowest values around 5 pm of 5th July when the lowest tidal height and strongest thermocline in the water column, suggesting that biological production resulted in decrease of $CO_2$ and increase of pH in the seaweed farm. Processes affecting the surface $fCO_2$ distribution were evaluated using a simple budget model. In day time, biological productions by phytoplankton and macro algae are the main factors for $CO_2$ drawdown and counteracted the amount of $CO_2$ increase by temperature and air-sea exchange. The model values were a little higher than observed values in night time due to the over-estimation of physical mixing. The model suggested that algal production accounted about 14-40% of total $CO_2$ variation in seaweed farm.

Comparison of the Gel Formation Ability and Stability of Encapsulated Microbial Inoculant Using Extractable Alginate from Sea Tangle (다시마 추출 Alginate를 이용한 미생물 캡슐화제의 겔 형성능 및 생균력 비교)

  • Choi, So-Young;Yoon, Min-Ho;Whang, Kyung-Sook
    • Applied Biological Chemistry
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    • v.49 no.3
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    • pp.170-174
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    • 2006
  • For the purpose of developing a high quality agricultural microbial inoculant, methods and materials for improving encapsulation were investigated. Preparation of capsule was conducted by improving extrusion system with micro-nozzle and peristaltic pump. The sodium alginate was selected because of its cheapness, stability of cells, and gel formation ability. The yields, physical properties and gel formation abilities of extractable alginate from sea tangle were investigated by hot water extractable and alkali soluble methods. The extraction yields of hot water extractable alginate (HWEA) and alkali soluble alginate (ASA) from sea tangle were 8 and 20%, respectively. The HWEA was almost not viscous even in 1.5% of the sample solution, whereas the ASA was very highly viscous in above 3% sample solution. The gel formation ability of each samples varied from 1.5% to 5% and the ASA showed a good gel formation ability at 3% solution as commercial alginate (CA). The soil microbial inoculant, Bacillus thuringiensis, Bacillus subtilis, Lactobacillus plantarum and Geotrichum candidum encapsulated sodium alginate with starch and zeolite for stabilizer. The survivability of encapsulated soil microbial inoculant using alginate without stabilizer appeared to be 66, 52, 70 and 50%, respectively. Inclusion of starch and zeolite with alginate bead increased viabilities in Bacillus sp. and Geotrichum candidum by 81-83% and 89%, respectively.

Screening for raw material of modified gelatin in marine animal skins caught in coastal offshore water in Korea (수식 어류껍질 젤라틴의 원료로서 연근해산 수산물껍질의 검색)

  • Cho, Soon-Yeong;Kim, Jin-Soo
    • Applied Biological Chemistry
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    • v.39 no.2
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    • pp.134-139
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    • 1996
  • In order to effectively utilize marine animal skin wastes in marine processing manufacture, conger eel skin, file fish skin and arrow squid skin as raw material of edible gelatin were screened. Conger eel skin was the highest in the collagen content, followed by Ole fish skin and arrow squid skin, in the order named. In the fish skins, the soluble and insoluble collagens occupied $67.4%{\sim}72.3%\;and\;27.7{\sim}32.6%$, respectively, and in the arrow squid skin, 30.4ft and 69.6ft, respectively. No difference in the amino acid composition between soluble and insoluble collagens was detected. Collagen from the marine animal skin catched in coasted and offshore water in Korea consisted ${\alpha}$ chain and ${\beta}$ chain, and ${\alpha}$ chain were hetero type. The sum of proline and hydroxyproline contents in conger eel skin collagen was higher than that in the other skin collagens, while was lower than that pork skin collagen. Conger eel skin collagen exhibited a higher denaturation temperature in solution and a higher degree of proline hydroxylation, compared with skin collagen of the respective species. The physical properties such as gel strength, melting point and gelling point of conger eel skin gelatin were superior to those of file fish skin and arrow squid skin gelatins.

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Production of Poly(3-hydroxybutyrate) Using Waste Frying Oil (Waste frying oil를 사용한 Poly(3-Hydroxybutyrate) 생합성)

  • Kim, Tae-Gyeong;Lee, Woosung;Gang, Seongho;Kim, Jong-Sik;Chung, Chung-Wook
    • Journal of Life Science
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    • v.29 no.1
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    • pp.76-83
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    • 2019
  • In this study, the optimal growth and poly(3-hydroxybutyrate) (PHB) biosynthesis of Pseudomonas sp. EML2 were established using waste frying oil (WFO) as a cheap carbon source. The fatty acid composition of WFO and fresh frying oil (FFO) were analyzed by gas chromatography. The unsaturated and saturated fatty acid contents of the FFO were 82.6% and 14.9%, respectively. These contents changed in the WFO. The compositional change in the unsaturated fatty acid content in the WFO was due to a change in its chemical and physical properties resulting from heating, an oxidation reaction, and hydrolysis. The maximum dry cell weight (DCW) and PHB yield (g/l) of the isolated strain Pseudomonas sp. EML2 were confirmed under the following culture conditions: 30 g/l of WFO, 0.5 gl of $NH_4Cl$, pH 7, and $20^{\circ}C$. Based on this, the growth and PHB yield of Pseudomonas sp. EML2 were confirmed by 3 l jar fermentation. After the cells were cultured in 30 g/l of WFO for 96 h, the DCW, PHB content, and PHB yield of Pseudomonas sp. EML2 were 3.6 g/l, 73 wt%, and 2.6 g/l, respectively. Similar results were obtained using 30 g/l of FFO as a carbon source control. Using the FFO, the DCW, PHB content, and PHB yield were 3.4 g/l, 70 wt%, and 2.4 g/l, respectively. Pseudomonas sp. EML2 and WFO may be a new candidate and substrate, respectively, for industrial production of PHB.

Characterization of a Corn Fiber Protein Film Containing Green Tea Extract (녹차 추출물을 함유한 옥피 단백질 필름의 특성)

  • Yang, Hyun-Ju;Lee, Ji-Hyun;Lee, Ji-Hyeon;Song, Kyung Bin
    • Journal of Applied Biological Chemistry
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    • v.58 no.2
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    • pp.145-151
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    • 2015
  • Corn fiber protein (CFP) was extracted from corn wet-milling by-product, corn fiber. CFP films containing various plasticizers and cross-linking agents were prepared and their mechanical properties were determined. Among the plasticizers and cross-linking agents used in this study, the CFP film containing 2 g fructose and 0.03% cinnamaldehyde had the most appropriate physical property. In addition, the CFP films containing green tea extract (GTE) were prepared by incorporating different amounts (0, 0.5, 1.0, 1.5%) of GTE into the film-forming solution. Tensile strength, film solubility, and opacity of the CFP films increased with the addition of GTE, whereas elongation and water vapor permeability of the CFP/GTE films decreased compared to those of the control. The antioxidant activity of the CFP/GTE film was determined in terms of 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity. As a result, antioxidant activity of the films increased with increasing GTE concentration. Furthermore, antimicrobial activity against Escherichia coli O157:H7, Listeria monocytogenes, and Staphylococcus aureus increased with increasing GTE concentration. These results indicate that the incorporation of GTE could enhance antioxidant and antimicrobial activities of the CFP films.

Effects of DBD-bio-plasma on the HSP70 of Fibroblasts: A New Approach on Change of Molecular Level by Heat Shock in the Cell (Fibroblasts 세포주의 HSP70에 대한 DBD-bio-plasma의 effects: Cell에서 Heat Shock에 의한 Molecular Level 변화로의 새로운 접근법)

  • Kim, Kyoung-Yeon;Yi, Junyeong;Nam, Min-Kyung;Choi, Eun Ha;Rhim, Hyangshuk
    • KSBB Journal
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    • v.30 no.1
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    • pp.21-26
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    • 2015
  • Plasma is an ionized gas mixture, consisting of neutral particles, positive ions, negative electrons, electronically excited atoms and molecules, radicals, UV photons, and various reactive species. Also, plasma has unique physical properties distinct from gases, liquids, and solids. Until now, non-thermal plasmas have been widely utilized in bio-medical applications (called bio-plasma) and have been developed for the plasma-related devices that are used in the medical field. Although numerous bio-plasma studies have been performed in biomedicine, there is no confirmation of the nonthermal effect induced by bio-plasma. Standardization of the biological application of plasma has not been evaluated at the molecular level in living cells. In this context, we investigated the biological effect of bio-plasma on living cells. Hence, we treated the fibroblasts with Dielectric Bauvier Discharge bio-plasma (DBD), and assessed the characteristic change at the molecular level, one of the typical cellular responses. Heat shock protein 70 (HSP70) regulates its own protein level in response to stimuli. HSP70 responds to heat shock by increasing its own expression at the molecular level in cells. Hence, we confirmed the level of HSP70 after treatment of mouse embryonic fibroblasts (MEFs) with DBD. Interestingly, DBD-plasma induced cell death, but there was no difference in the level of HSP70, which is induced by heat shock stimuli, in DBD-treated MEFs. Our data provide the basic information on the interaction between MEFs and DBD, and can help to design a molecular approach in this field.

Comparison of Dry Reforming of Butane in Catalyst Process and Catalyst+Plasma Process over Ni/γ-Al2O3 Catalyst (뷰테인 건식 개질 반응을 위한 Ni/γ-Al2O3 촉매를 이용한 촉매 공정과 촉매+플라즈마 공정 비교)

  • Jo, Jin-Oh;Jwa, Eunjin;Mok, Young-Sun
    • Journal of the Korean Institute of Gas
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    • v.22 no.1
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    • pp.26-36
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    • 2018
  • Conventional nickel-based catalyst processes used for dry reforming reactions have high activation temperatures and problems such as carbon deposition and metal sintering on the active sites of the catalyst surface. In this study, the characteristics of butane dry reforming reaction were investigated by using DBD plasma combined with catalytic process and compared with existing catalyst alone process. The physical and chemical properties of the catalysts were investigated using a surface area & pore size analyzer, XRD, SEM and TEM. Using $10%Ni/{\gamma}-Al_2O_3$ at $580^{\circ}C$, in the case of the catalyst+plasma process, the conversion of carbon dioxide and butane were improved by about 30% than catalyst alone process. When the catalyst+plasma process, the conversion of carbon dioxide and butane and the hydrogen production concentration are enhanced by the influence of various active species generated by the plasma. In addition, it was found that the particle size of the catalyst is decreased by the plasma in the reaction process, and the degree of dispersion of the catalyst is increased to improve the efficiency.

Exposure Assessment of Phthalates from House Dust and Organic Films in the Indoor Environment (실내환경 중 집먼지 및 유기필름에서 기인한 프탈레이트 노출평가)

  • Joen, Jeong-In;Lee, Hye-Won;Lee, Seung-Hyun;Lee, Jeong-Il;Lee, Cheol-Min
    • Journal of Environmental Health Sciences
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    • v.48 no.2
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    • pp.75-85
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    • 2022
  • Background: Various types of semi-volatile organic compounds (SVOCs) exist in the public's living environment. They occur in different forms in terms of their physical and chemical properties and partition coefficients. As a consequence, indoor exposure to SVOCs occurs via various routes, including inhalation of air and airborne particles, skin contact, and dust intake. Objectives: To propose a method for assessing human exposure to the SVOCs occurring in the air of an indoor environment, the concentrations of SVOCs in house dust and organic films measured in a real residential environment were estimated in terms of gas-phase concentration using the partition coefficient. Assessment of inhalation exposure to SVOCs was performed using this method. Methods: Phthalates were collected from samples of house dust and organic films from 110 households in a real residential environment. To perform an exposures assessment of the phthalates present in organic films, gas-phase concentration was calculated using the partition coefficient. The airborne gas-phase concentrations of phthalates from the house dust and organic films were estimated and exposure assessment was performed based on the assumption of inhalation exposure from air. Results: As a result of the exposure assessment for gas-phase phthalates from house dust and organic films, preschool children showed the highest level of inhalation of phthalates, followed by school children, adults, and adolescents. Conclusions: This study includes the limitation of not considering different SVOCs exposure pathways in the health impact assessment, including those of phthalates in the indoor living environment. However, this study has the significance of performing exposure assessment based on exposure to SVOCs present in indoor air that originated from organic films in the indoor residential environment. Therefore, the results of this study should be useful as basic data for exposure and health risk assessments of SVOCs associated with organic films in the indoor environment.