• 한국균학회소식:학술대회논문집
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• 한국균학회 2014년도 추계학술대회 및 정기총회
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• pp.23-23
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• 2014

There are many yeast strains have been discovered for industrial usage in global scale. In the point of view for the alcoholic fermentation performance and producing alcoholic beverage products, recently many countries have known about the importance of microorganisms as a valuable resource. Discovered with well performed yeasts have potential industrial application in diverse ways such as foods, beverages, cosmetics, pharmaceutical functions, and so on. In Korea, the yeast research has not been sufficiently performed especially for distilled spirits industry. As a result, not so little manufacturers use exotic yeasts from overseas even included the expensive royalties. Besides of those, to produce distilled spirits, many manufacturers do not use specialized yeast for distilled spirits. Distiller's characterized yeasts such as whisky, brandy, vodka, Japanese shochu and awamori, are all well-known industrialized. For decades, the distillers, except us, have selected, developed, and practised yeasts in accordance with distilled spirits characters. This study is about selection and industrial application of yeasts for the Korean pot distilled spirits. Finally 7 yeast strains were selected among over 1,000 yeasts from the traditional Nuruks, through the essential related tests based on brewing and distilling science. The selected yeasts show the appropriate characteristics of distilled spirits. The result of this study could help our distilled spirits industry be activated and stand independent from the exotic microbes.

• 미생물학회지
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• 제8권4호
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• pp.141-150
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• 1970

As a part of taxonomical and ecological studies on the yeasts in marine environments, several kinds of yeasts were isolated from Zostera marina several invertebrates (penaeus, Meretrix and Neptunus) and surface sea water, which are collected at the two established sites of estuarine areas ; Dolsan isaland in Youchun district and Baiksu-ri in Youngkwang district. The obtained results can be summarized as follows. 1. Ascosporgenous Yeasts. Hansenula sp I and Hansenula sp II were isolated from Zotera marina and Hanse nular sp I from penaeus. 2. Asporogenous Yeasts. Trichoporon fermentans, Torulopsis, ernobii and Toruopsis dattia were isolated from Zostera marina, Candida krusei from Meretrix and Neptunus, Torulopsis pinus from surface sea waters, and Phodotorula aurantiaca from Penaeus. 3. More notable isolations of several species from Zostera marina than the other sources could be assumed as related to the higher sugar concentration of this plant.

• 한국식품영양과학회지
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• 제27권2호
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• pp.232-238
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• 1998

To developed natural food preservatives, ethanol and water extracts were prepared from the defatted camellia(Camellia japonica L.) seeds. Antimicrobial activities were examined against 14 microorganisms which were food borne pathogens and/or food poisoning microorganisms and food-related bacteria and yeasts. Ethanol extract showed antimicrobial activities against several microorganisms tested, but not on lactic acid bactria. Especially, minimum inhibitory concentrations(MIC) for yeasts were as low as 1mg/ml. Water extract exhibited antimicrobial activities for the yeasts tested, but almost bacteria were not observed. The ethanol extract was fractionated in the order of hexane, chloroform, ethylaetate and butanol fractions to test antimicrobial activity. The strongest activity for the tested yeasts were found in the butanol fractions, but bacteria were chloroform fraction. Hansenula anomala treated with ethanol were observed by scanning electron micrograph, and the results exhibited morphological changes, including the irregularly contracted cell surface and expanded ellipsoidal shape.

• 한국식생활문화학회지
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• 제15권4호
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• pp.233-239
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• 2000

In order to optimize the quality of pine sprout tea, its chemical properties were analyzed and the yeasts associated with the quality of pine sprout tea during the storage were isolated and identified. In proximate composition moisture content was 20.13%, but other components except sugar were relatively low. Sugars such as glucose(30.15%), fructose(19.57%), and sucrose(9.27%) were major sugars which contained up to 76.73%. Total vitamin C and soluble tannin contents were 11.31 mg% and 68.31 mg%, respectively. Thirteen kinds of free amino acids were detected, but they were contained only in trace. In fatty acid composition 64.69% of fatty aids composed mainly of saturated fatty acids and major fatty acids were oleic acid, palmitic acid, and tricosaenoic acid. Among 8 mineral elements detected, calcium content was highest with 79.00 mg% and followed by potassium(45.16 mg%) and magnesium(8.93 mg%). The sweetness of pine sprout tea was gradually decreased from $70^{\circ}\;Brix\;to\;63^{\circ}\;Brix$ and 3.2% of ethanol at the initial concentration was increased to 6.0% during the storage of 40 days. The yeasts associated with the quality and alcohol formation of pine sprout tea during the storage were identified by Biolog MicrostationlTM system, as Zygosaccharomyces rouxii, Kluyveromyces lodderae, Kluyveromyces wickerhamii, and Pichia fluxuum.

• 한국식품과학회지
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• 제32권2호
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• pp.444-447
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• 2000

염농도를 $3{\sim}30%$로 달리하여 새우를 $20^{\circ}C$에서 발효하면서 발효시간에 따른 미생물 변화를 조사하였다. 염농도 3, 8, 30%에서 세균과 효모는 발효기간에 따라 감소하는 경향을 보였으나 염농도 18%에서는 초기수준을 유지하거나 증가하는 경향을 보였다. 호염성 세균의 발현은 염을 18% 수준으로 첨가하여 제조한 새우젓의 후반부 발효에서 두드러졌으며, 호염성 효모도 염농도 18%에서 가장 많은 수가 검출되어 염농도 18%가 새우젓 숙성에 관련된 미생물 생육에 가장 적합한 환경을 제공하는 것으로 나타났다.

• 한국균학회지
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• 제19권4호
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• pp.253-257
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• 1991

담자균효모와 관련분류를 균주의 균체당조성(菌體糖組成)을 수식없이 원래 상태로 분석할 수 있는 HPLC법을 사용하여 분석하였다. Leucosporidium lari-marini는 균체당 xylose를 함유하고 있으나 Leucosporidium antarcticum, Leucosporidium scottii, Leucosporidium fellii, Rhodosporidium fluviale는 균체당 xylose를 함유하지 않았다. Leucosporidium scottii에서 종래 xylose 함유가 보고된 균주에서 xylose를 확인할 수 없었다 . 균체당 조성에 기초한 수리분석결과와 다른 성질을 함께 고려하면 L.antarcticum과 L. antarcticum과 L. lari-marini는 Cystofilobasidium속이나 Mrakia속에 이적되어야 함이 시사되었다.

• 한국미생물·생명공학회지
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• 제38권1호
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• pp.7-12
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• 2010

S. cerevisias의 치명적인 약점인 xylose 또는 arabinose가 상당부분을 차지하는 hemicellulose 기수분해물인 오탄당 발효의 극히 낮은 효율은 유전자 변형 및 대사적 흐름을 조절하여 세포 내로의 오탄당 섭취 및 활용 증가를 위한 연구가 꾸준히 진행되고 있다. S. cerevisie에서 오탄당은 육탄당보다 1-2 배 낮은 친화력을 가지고 있어, 오탄당 운반은 이를 이용한 바이오에탄올 발효에 있어서 중요한 초기 조절 단계이다. 오탄당 이용가능 S. cereivsiae에서 오탄당 운반기의 발현 관련 소수의 연구가 보고되고는 있으나 아직까지 눈에 띠는 효율 증기눈 보교되지 않았다. 최근 보고된 S. cerevisiae에서 C. intermeda 유래의 glucose/xylose의 확산을 용이하게 하는 운반기와 공동수송기의 이종발현이 처음으로 활성화 되었음이 보고 되었다. 따라서 그러므로 높은 친화력의 xylose 운반기의 발현은 이미 xylose로 부터 바이오에탄올 발효공정은 최적화되어 있지만 여전히 몇 가지 제한 요소들을 가지고 있는 S. cerevisiae 균주들의 xylsoe 발효공정 효율 향상에 큰 기여를 할 수 있을 것으로 기대된다.

• KSBB Journal
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• 제19권5호
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• pp.352-357
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• 2004

Human ferritin H- and L-chain genes (hfH and hfL) were cloned into the yeast shuttle vector YEp352 containing the GAL1 (galactokinase) and GAL10 (epimerase) divergent promoters and the vectors constructed were used to transform Saccharomyces cerevisiae 2805. SDS-PAGE displayed expression of the introduced hfH and hfL in both recombinant strains of Y1H10L and Y1L10H. The ferritin subunits, that represented ca. $22\%$ and $15\%$ of the soluble proteins in Y1H10L and Y1L10H, were spontaneously assembled into active ferritin heteropolymers. The H subunit content of the purified recombinant human ferritin heteropolymers was proven to reflect the relative expression yield of the subunits. When the cells of 2d culture were incubated with 14.3 mM Fe(2), the cellular iron concentration of Y1H10L and Y1L10H was 1.7 and 2.0 times, respectively, that of the control strain. It is assumed that increase in the iron uptake of the recombinant yeasts is closely related to ferritin expression and H subunit content.

• 한국미생물·생명공학회지
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• 제25권3호
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• pp.293-297
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• 1997

To develope natural food preservatives of pine needle (Pinus densiflora Seib et Zucc.) extract, pine needle sap, ethanol and ether extracts were prepared for investigation of antimicrobial activities against food-related bacteria and yeasts. All extracts exhibited growth inhibiting activities for most of microorganisms tested. However, in general, growth inhibiting activities were higher in ethanol extract than in sap or ether extract. Minimum inhibitory concentrations (MIC) of ethanol extract for Lactobacillus casei, Pseudomonas aeruginosa or Escherchia coli were as low as 0.1 mg/ml, whereas MIC of sap or ether extract for most bacteria and yeasts were 0.25-0.8mg/ml, indicating that the ethanol extract showed the antimicrobial activity by 2.5 $\sim$8 times higher than the sap and ether extract. The antimicrobial activity of the ethanol extract was reduced by heating or alkali treatment. Moreover, growth of Pseudomonas aeruginosa was completely inhibited within 24 hours by the addition of at least 50ppm of ethanol extract. These findings suggest that pine needle, specially the ethanol extrat may play a role for natural food preservatives.

• 한국수산과학회지
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• 제32권6호
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• pp.791-797
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• 1999

Kluyveromyces fragilis (ATCC 36534)와 Candida utilis (ATCC 9950) 균주를 사료 첨가제와 rotifer 먹이로서 가치를 평가하기 위해 성장 단계별 및 세포벽의 화학처리에 따른 영양가를 분석하여 비교하였다. 조단백질 함량은 K. fragilis가 $48.2\~58.5\%$로 C. utilis의 $25.9\~43.4\%$보다 높은 경향을 보였고, 조지방 함량은 K. fragilis 및 C. utilis모두 $0.1\~1.6\%$로 매우 낮은 수준이었다. 조섬유의 함량은 두 효모에서 $0.6\~3.3\%$의 범위로 낮은 수준이었으며, protoplasted 효모의 경우는 다소 낮아지는 경향을 보였다. 효모종류에 따라 아미노산 조성이 다소 차이를 보였는데, Asp, Gly, Pro, Leu, Lys 및 Val은 K. fragilis가 C. utilis보다 그 함량이 높았으며, Glu 및 Arg은 C. utilis가 상대적으로 더 높은 경향을 보였다. 성장 단계별 아미노산 조성은 특별한 변화 경향이 없었으며, 세포 외벽을 처리한 protoplasted K. fragilis와 C. utilis의 Glu, Gly 및 Asg은 처리전보다 낮아지는 경향이었고, Leu, Phe 및 Val의 함량은 다소 높아진 것으로 나타났다. K. fragilis 및 C. utilis의 지방산은 대부분 $C_{18}$ 이하의 포화 또는 불포화산으로 구성되어 있었는데, 주로 $C_{16-18}$의 지방산들은 early log 또는 log phase에서 death phase로 갈수록, 그리고 protoplast에서 낮아지는 반면에 $C_{10-12}$와 같은 저급 지방산들은 증가하는 경향을 보였다. K. fragilis 및 C. utilis의 early log phase에서는 ATP 함량이 검출되지 않았지만, 그 후 단계 (log - death phase)에서 각각 증가하는 경향을 보였다 ADP 함량은 K. fragilis에서 early log phase 이후 단계부터 증가하였고, 세포막을 처리한 protoplast 상태에서는 높은 수준을 유지하였지만, C. utilis의 경우는 성장이 진행됨에 따라 감소하는 경향을 보였으며, protoplast 상태에서는 그 함량이 낮아지는 경향을 보였다. AMP 함량은 두 균주 모두 early log phase에서 낮은 수준이었지만, 그 후 단계에서는 높은 함량을 유지하였으며, protoplast 상태에는 검출되지 않았다 IMP 함량은 두 균주 모두 log phase에서 가장 높은 값을 보였으며, protoplast 상태에서는 낮은 값을 보였다. Inosine 함량은 K. fragilis의 성장이 진행됨에 따라 증가되었고, C. utilis에서는 K. fragilis보다 높은 경향이었으며, log phase에서 최대값을 보였다. 성장 단계별로 이들의 핵산관련물질의 총량은 두 균주 모두 early log phase에서 가장 낮은 값을 보였으며, 각 성장 단계별로 K. fragilis가 C. utilis보다 높은 값을 유지하였고. protoplast 상태에서는 C. utilis가 더 높은 값을 나타내었다.