• 한국식품영양과학회지
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• 제30권4호
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• pp.579-588
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• 2001

한국 남해안에서 양식생산되고 있는 김류의 함질소엑스성분 조성 및 월별 변동을 구명하기 위하여 1998년 1월부터 4월까지 월별로 전남 장흥군에서 양식된 잇바디돌김, Porphyra dentata 생엽을 매월 1회씩 채취하여 맛과 밀접한 관계가 있는 함질소엑스성분 즉, 엑스분질소, 유리아미노산, 결합아미노산, ATP관련화합물, 4급암모늄염기 등을 분석하여 방사무늬김, P. yezoensis와 비교하였다. 엑스분질소함량은 760~872 mg/100 g(건물)이었다. 유리아미노산은 27~31종이 분석되었으며, 그 총량은 2,404~3,966 mg/100 g(건물)이었다. 함량이 많은 유리아미노산으로서는 alanine, taurine, glutamine, glutamic acid, aspartic acid 등이었다. 결합아미노산은 가수분해 후 16~23종에서 증가하였으며, 유리아미노산 총량의 36.0~112.0% 수준이었다. ATP관련화합물 총량은 73.3~94.4 mg/100 g(2.04~4.43 $\mu$mol/g, 건물)이었다. Be-taine류로서는 homarine과 trigonelline이 모든 시료에서 검출되었고, $\beta$-alaninebetain과 ${\gamma}$-butyrobetaine은 일부시료에서 검출되었다. TMA는 모든 시료에서 확인되었으며, TMAO는 일부시료에서 분리되었다. 잇바디돌김 생엽의 함질소엑스성분 특징은 방사무늬김에서 처럼 유리아미노산과 결합아미노산 함량이 풍부하여 질소분포의 약 90%에 달하는 중요한 맛성분이었으나 그 성분조성의 월별 변동에는 다소 차이를 보여 대부분의 성분들이 1, 3월에 높고 2, 4월에 낮았다. 잇바디돌김은 방사무늬김에 비해 전반적으로 함질소엑스성분 함량이 약간 낮은 수준이었다.

• 전기의세계
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• 제37권6호
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• pp.48-52
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• 1988

본고에서는 고온열원으로써 열 플라즈마를 금속의 melting/remelting이나 extractive metallurgy에 이용할 때 얻을 수 있는 에너지 절약효과와 경제적인 이득 및 공정상의 장점등을 소개하고자 한다.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 1998년도 수산관련공동학술대회발표요지집
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• pp.224-225
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• 1998

• KSBB Journal
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• 제15권4호
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• pp.380-387
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• 2000

An extractive fermentation process using pervaporation was studied in a 7 liter fermentor. Pervaporation was performed using a silicone membrane module and a low-acid-producing strain Clostridium acetobutylicu, B18 was used to produce butanol. In batch culture without pervaporation pH 5.5 and initial glucose concentration of 60 g/L resulted in the highest butanol productivity (0.216 g/L$.$h) with butanol yield of 0.261 Butanol flux through the membrane was best at 2.0 L/min-tubing of air flow rate In batch and fed-batch fermentation glucose consumption rate increased by 1.3 times with pervaporation.

• 한국산림과학회지
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• 제2권1호
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• pp.29-32
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• 1962

(1) 자연상태(自然常態)에서 활엽수(闊葉樹) 기주(寄主) 선택성(選擇性)인 목재(木材) 부후성(腐朽性) 식용균(食用菌) 6종(種)을 골라 소나무 톱밥을 재료(材料)로 하여 배양(培養) 실험(實驗)했다. (2) 소나무톱밥만을 단용(單用)한 배지(培地)에서는 pholiota squarrsa를 제외(除外)한 다른 균류(菌類)의 균계(菌系) 신장(伸長)은 보다 조해(阻害)되고 있다. (3) 광당전즙(光糖煎汁) 가용(加用)톱밥 배지(培地)에서는 추출(抽出) 처리구(處理區) 및 무처리구(無處理區) 어느 경우(境遇)나 균계(菌系) 신장(伸長)은 거의 차이(差異) 없이 호양(好良)하다.

• Journal of Biosystems Engineering
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• 제23권5호
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• pp.491-498
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• 1998

Transplanting process during the tissue culture of potato seedlings is costly, since the cost of highly skilled labor working in the sanitary environment takes up about 60-70% of the production cost. The objective of this study was to develop a soft gripper of a transplanting robot system for the labor-saving tissue culture. The prototype of the soft gripper was consisted of power-transmitting part finger and plant contacts. The power transmitting part transformed the rotating motion of a step motor to the reciprocating motion of the finger. Plant stems used in the test were potato seedlings cultured for six weeks. The dimensional characteristics of cultured seedlings, the compressive strengths of the stems, the extractive force from the culture medium and the gripping force of the finger were measured. A proper gripping force was found to be 0.343N at the extractive force of 0.41N when the plant contacts were made of silicon. Sixteen plants out of 70 trials were tangled with others, resulting in the success rate of 77.1%.

• Korean Chemical Engineering Research
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• 제55권4호
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• pp.490-496
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• 2017

We have designed an extractive distillation for separating maximum boiling azeotrope of acetone-chloroform system. PRO/II 9.4 was used to simulate the overall process. The VLE data adopted from Dortmund data bank was regressed to obtain a new set of binary interaction parameters. Three different entrainers were used for the separation process--dimethyl sulfoxide (DMSO), ethylene glycol (EG) and benzene--to test their viability for the acetone-chloroform system. Thermodynamic feasibility analysis was done through ternary map diagrams. Two different thermodynamic models, NRTL and UNIQUAC, were explored for the study of overall process.

• 한국미생물·생명공학회지
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• 제22권5호
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• pp.531-537
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• 1994

This study was undertaken with objective of optimizing the conditions of fermentation in an aqueous two-phase system which is composed of polyethylene glycol (PEG) 20000 and crude dextran (Dx). The data were obtained and analyzed using the Box-Wilson's experimental design protocol and the response surface methodology. To reach this end a multilinear polynomial regres- sion model was developed, which can be utilized for the purpose of optimizing the extractive fermentation. Optimum conditions for batch fermentation with aqueous two phase system were found to be at 4.2~5.4% PEG/3.2~4.2% Dx range. The composition of the center was 4.8% PEG/ 3.6% Dx. Optimum operating conditions for initial sugar concentration and fermentation time were approximately 160 g/l, and 21~22 hr, respectively. Fermentation in the aqueous two phase system composed of 5% PEG/4% Dx showed increase of 23% in ethanol concentration, of 9.5% in ethanol yield, and of 19% in ethanol productivity as compared to the case of fermentation of neat Jerusalem artichoke juice.

• Biotechnology and Bioprocess Engineering:BBE
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• 제6권6호
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• pp.386-394
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• 2001

Carboxylic acids are examples of compounds with wide industrial applications and high potential, This article presents the principles of reactive extraction along with the character-istics of tertiary amine extractants, while is given on considering the effect of the amine class and chain length, As such a brief overview the current research on reactive extraction, including the recovery of citric acid, selective amine-based extraction , and extractive fermentation is given. When discussing extractive fermentation strategies for reducing solvent toxicity are also suggested based on specific examples. Finally, solvent regeneration and stripping of extracted acid explained.

• KSBB Journal
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• 제15권5호
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• pp.458-463
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• 2000

Production of acetic acid from cellulosic biomass by Simultaneous Saccharification and Extractive Fermentation (SSEF) was investigated. The homoacetate organism used in this study was a strain of Clostridium thermoaceticum, ATCC # 49707. A batch operation of Simultaneous Saccharification and Fermentation(SSF) using ${\alpha}$-cellulose at pH 5.5 and 55$^{\circ}C$ yielded 40% conversion of cellulose to acetic acid, while a fed-batch SSF operation produced a maximum acetic acid concentration of 25 g/L, with 50% overall yield. In-situ extractive fermentation to reduce the end-product inhibition on both bacteria and enzyme was carried out. in a batch SSEF using 200 g/L IRA-400 resin, acetic acid concentration reached to 23.9 g/L and acetic acid yield and productivity were observed to be 48% and 0.20 g/L-hr, respectively.