• 해양환경안전학회지
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• 제24권6호
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• pp.750-763
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• 2018

본 연구는 울진 바다목장해역에 서식하는 생물을 대상으로 바다목장 관리를 위한 해양생태계의 영양구조와 에너지흐름을 파악하기 위한 목적으로 2013년 3월부터 10월까지 총 4회 현장조사를 실시하였다. 본 연구에서 개별 생물종들의 생태학적 특징에 따라 유사도에 근거한 비계량형다차원척도법을 사용하여 최고포식자, 바다새, 대형 및 소형유영어류, 볼락류, 가자미류, 저서어류, 반저서어류, 두족류, 저서섭이자, 표서동물, 이매패류, 전복, 자포동물, 동물플랑크톤, 부착성해조류, 미소해조류, 식물플랑크톤, 유기쇄설물 등 총 19가지로 생물그룹핑되었다. Ecopath 모델의 입력변수인 각 생물군들의 생체량, 생산량/생체량의 비, 섭식량/생체량의 비, 피식-포식관계 자료를 사용하여 울진 바다목장해역의 영양구조와 에너지 흐름을 추정하였다. 연구해역에서 각 생물군들의 영양단계는 1 ~ 5.687 범위로 파악되었다. 울진 바다목장 해역에 서식하는 모든 생물그룹들의 전체 소비량의 합은 $229.7t/km^2/yr$, 생물그룹들의 전체 이출량은 $3,432.4t/km^2/yr$이었다. 모든 생물그룹들의 총 에너지량은 $6,796.2t/km^2/yr$, 전체 생산량은 $3,613.1t/km^2/yr$로 추정되었다. 울진 바다목장 해역에서의 순 생태계 생산량은 $3,490.3t/km^2/yr$, 전체 생물군의 생체량은 $167.3t/km^2/yr$으로 추정되었다.

• 임산에너지
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• 제21권1호
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• pp.76-82
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• 2002

경기도 광주군 태화산 서울대학교 중부연습림내 30년생 신갈나무 순림의 생산력을 조사하였다. 8본의 표본목을 흉고직경급별로 벌목하여, 각 층별 및 부위별 중량을 측정하고 생산구조를 조사한 결과를 요약하면 다음과 같다. (1) 신갈나무의 광합성 부는 지상부 4m부터 시작되며, 수관의 최대광합성부는 10m를 전후해서 나타났다. (2) 지상부의 현존량은 줄기 51.262ton/ha(75.5%), 가지 13.148ton/ha(19.4%), 잎 3.476ton/ha (5.1%), 그리고 지상부 전체 건중량 67.88ton/ha로 나타났다. (3) 신갈나무 단순림의 연순생산량은 수간 5.624ton/ha/yr(44.07%), 가지 3.663ton/ha/yr (28.70%), 잎 3.4.76ton/ha/yr(27.23%), Wt 12.763ton/ha/yr로 나타났으며, 특히 가지와 잎의 비율이 큰 비중을 차지하는 것으로 나타났다.

• 한국해양학회지
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• 제28권2호
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• pp.107-113
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• 1993

하구 혼합이 활발한 만경.동진강하구에서 박테리아와 일차생산자와의 상호 관계 의 특징에 대해, 그리고 이러한 관계의 특징이 일차생산자의 군집구조와 어떠한 관련 이 있는가에 대해 1990년 7월에서 1991년 10월 동안 4회에 걸친 측정자료를 분석하였 다. 연구기간 동안 엽록소와 생산량만이 의미있는 관계 ($r^2$>0.36, p<0.02) 를 나타내어, 본 연구해역에서 일차생산자의 생물량에 관련된 과정이 박테리아의 생산 량과 관련이 있었으며를 시사하였다. 그러나 유광대내의 박테리아 생산량은 일차생산 량은 매우 적은 부분(평균2.6%)을 차지하여, 두 변수 사이에 uncouplin이 존재함을 시 사하였다. 이러한 uncoupling은 동물플랑크톤의 먹이인 식물플랑크톤이 주로 개체 크 기가 크고 사슬을 형성하는 규조류로 구성되어 있는 먹이사슬 구조에 기인하는 것으로 추측된다.

• Carbon letters
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• 제11권3호
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• pp.224-234
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• 2010

Four activated carbons were produced by two-stage process as followings; semi-carbonization of indigenous biomass waste, i.e. cotton stalks, followed by chemical activation with KOH under various activation temperatures and chemical ratios of KOH to semi-carbonized cotton stalks (CCS). The surface area, total pore volume and average pore diameter were evaluated by $N_2$-adsorption at 77 K. The surface morphology and oxygen functional groups were determined by SEM and FTIR, respectively. Batch equilibrium and kinetic studies were carried out by using a basic dye, methylene blue as a probe molecule to evaluate the adsorption capacity and mechanism over the produced carbons. The obtained activated carbon (CCS-1K800) exhibited highly microporous structure with high surface area of 950 $m^2/g$, total pore volume of 0.423 $cm^3/g$ and average pore diameter of 17.8 ${\AA}$. The isotherm data fitted well to the Langmuir isotherm with monolayer adsorption capacity of 222 mg/g for CCS-1K800. The kinetic data obtained at different concentrations were analyzed using a pseudo-first-order, pseudo-second-order and intraparticle diffusion equations. The pseudo-second-order model fitted better for kinetic removal of MB dye. The results indicate that such laboratory carbons could be employed as low cost alternative to commercial carbons in wastewater treatment.

• Asian-Australasian Journal of Animal Sciences
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• 제14권6호
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• pp.862-879
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• 2001

The walls of all higher plants are organized as a cellulosic, fibrillar phase embedded in a matrix phase composed of non-cellulosic polysaccharides, some proteins and, in most secondary walls, lignin. At the effective utilization of plant biomass, qualitative and quantitative analyses of plant cell walls are essential. Structural features of individual components are being clarified using newly developed equipments and techniques. However, "empirical" procedures to elucidate plant cell walls, which are not due to scientific definition of components, are still applied in some fields. These procedures may give misunderstanding for the effective utilization of plant biomass. In addition, interesting the investigation of wall organization is moving towards not only qualitatively characterisation, but also quantitation of the associations between wall components. These involve polysaccharide-polysaccharide and polysaccharide-lignin cross-links. Investigation of the associations is being done in order to understand the chemical structure, organization and biosynthesis of the cell wall and physiology of the plants. Procedures for qualitative and quantitative analyses based on the definition of cell wall components are reviewed focussing in nutritional elucidation of forage grasses by ruminant microorganisms.

• Ocean and Polar Research
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• 제33권1호
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• pp.21-34
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• 2011

We determined potential meso-scale benthic-pelagic ecosystem coupling in the north equatorial Pacific by comparing surface chl-a concentration with sediment bacterial abundance and adenosine triphosphate (ATP) concentration (indication of active biomass). Water and sediment samples were latitudinally collected between 5 and $11^{\circ}N$ along $131.5^{\circ}W$. Physical water properties of this area are characterized with three major currents: North Equatorial Current (NEC), North Equatorial Count Current (NECC), and South Equatorial Current (SEC). The divergence and convergence of the surface water occur at the boundaries where these currents anti-flow. This low latitude area ($5{\sim}7^{\circ}N$) appears to show high pelagic productivity (mean phytoplankton biomass=$1266.0\;mgC\;m^{-2}$) due to the supplement of high nutrients from nutrient-enriched deep-water via vertical mixing. But the high latitude area ($9{\sim}11^{\circ}N$) with the strong stratification exhibits low surface productivity (mean phytoplankton biomass=$603.1\;mgC\;m^{-2}$). Bacterial cell number (BCN) and ATP appeared to be the highest at the superficial layer and reduced with depth of sediment. Latitudinally, sediment BCN from low latitude ($5{\sim}7^{\circ}N$) was $9.8{\times}10^8\;cells\;cm^{-2}$, which appeared to be 3-times higher than that from high latitude ($9{\sim}11^{\circ}N$; $2.9{\times}10^8\;cells\;cm^{-2}$). Furthermore, sedimentary ATP at the low latitude ($56.2\;ng\;cm^{-2}$) appeared to be much higher than that of the high latitude ($3.3\;ng\;cm^{-2}$). According to regression analysis of these data, more than 85% of the spatial variation of benthic microbial biomass was significantly explained by the phytoplankton biomass in surface water. Therefore, the results of this study suggest that benthic productivity in this area is strongly coupled with pelagic productivity.

• KSBB Journal
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• 제15권4호
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• pp.398-401
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• 2000

Taxus chinensis 식물세포 배양에 의한 paclitaxel대량 생산의 경우 biomass내 paclitaxel이외에 다른 많은 유도체들이 확 인 되었다. 이를 목표 물질로 선정하여 Prep-LC를 이용하여 분리/정제하고 NMR, MS 등으로 화학구조분석을 하여 이들 물질들에 대한 동정을 하였다. 또한 Taxus chinensis 식물세포 배양에 의한 paclitaxel 대량 생산의 경우 paclitaxel 생산량에 따른 여러가지 유도체들의 생산 경향을 조사하였으며, paclitaxel의 생산량이 증가할 수록 유도체들의 생산량은 상대 적으로 감소함을 알 수 있었다. 이러한 연구는 결국 paclitaxel 이외의 새로운 유용성분 및 전구체 확인, 분리/정제 방법의 개발, paclitaxel 생산에서의 품질관리에 유용하게 사용되어 질 수 있다.

• 펄프종이기술
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• 제48권1호
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• pp.67-74
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• 2016

The demand of environmental friendly packaging materials such as pulp mold has been increased. The application of the oil palm biomass, EFB (Empty Fruit Bunch) fiber as natural raw materials to the pulp mold could increase the usability of the pulp mold by the reduced production cost brought from the relatively low cost of EFB. The effects of the EFB(Empty Fruit Bunch) fibers on the properties of pulp mold and on the process efficiency were evaluated in this study. The pulp mold samples were prepared with mixture ONP (Old news paper) and EFB by using laboratory wet pulp molder. The changes in the drying efficiency were measured with the changes in the solid contents of pulp mold samples during drying process. The efficiency of the surface coating treatment on the pulp mold depending on the condition of the pulp mold samples were also evaluated in order to improve the water resistance properties of pulp mold. The addition of EFB increased the drying efficiency by providing the bulkier structure and the higher water contact angle, which indicated the better water resistance properties. The water resistance were improved by the surface coating treatments and the application of surface coating on the pulp mold at the higher moisture contents resulted in the higher improvement in the water resistance. The bulkier structure originated from the application of EFB fiber reduced the effects of the surface coating, which could be overcome by the control of surface coating process.

• Journal of Microbiology and Biotechnology
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• 제24권5호
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• pp.629-638
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• 2014

This study describes an alternative mixed culture fermentation technology to anaerobically convert lignocellulosic biomass into butyric acid, a valuable product with wide application, without supplementary cellulolytic enzymes. Rice straw was soaked in 1% NaOH solution to increase digestibility. Among the tested pretreatment conditions, soaking rice straw at $50^{\circ}C$ for 72 h removed ~66% of the lignin, but retained ~84% of the cellulose and ~71% of the hemicellulose. By using an undefined cellulose-degrading butyrate-producing microbial community as butyric acid producer in batch fermentation, about 6 g/l of butyric acid was produced from the pretreated rice straw, which accounted for ~76% of the total volatile fatty acids. In the repeated-batch operation, the butyric acid production declined batch by batch, which was most possibly caused by the shift of microbial community structure monitored by denaturing gradient gel electrophoresis. In this study, batch operation was observed to be more suitable for butyric acid production.

• Journal of Microbiology and Biotechnology
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• 제27권12호
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• pp.2165-2172
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• 2017

Lignocellulose is now a promising raw material for biofuel production. However, the lignin complex and crystalline cellulose require pretreatment steps for breakdown of the crystalline structure of cellulose for the generation of fermentable sugars. Moreover, several fermentation inhibitors are generated with sugar compounds, majorly furfural. The mitigation of these inhibitors is required for the further fermentation steps to proceed. Amino acids were investigated on furfural-induced growth inhibition in E. coli producing isobutanol. Glycine and serine were the most effective compounds against furfural. In minimal media, glycine conferred tolerance against furfural. From the $IC_{50}$ value for inhibitors in the production media, only glycine could alleviate growth arrest for furfural, where 6 mM glycine addition led to a slight increase in growth rate and isobutanol production from 2.6 to 2.8 g/l under furfural stress. Overexpression of glycine pathway genes did not lead to alleviation. However, addition of glycine to engineered strains blocked the growth arrest and increased the isobutanol production about 2.3-fold.