• Nuclear Engineering and Technology
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• 제34권1호
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• pp.9-21
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• 2002

Recently each domestic NPP has achieved zero release in liquid effluent activity. However, when looking back past experiences in world nuclear power operation, it is thought that another maximum activity reduction in the released liquid effluent just prior to falling it into environment, if possible, will bring a good effect in PA viewpoint. As the intent of applying the safety concept of diversity to conducting the above activity reduction measure, a scheme passing that effluent through the Deposition Bed just before discharging it into ocean environment was divised. Both Zeolite and ＂the mixed ＂Anthracite-sand＂ were derived as the main activity adsorption medium used in the Deposition Bed, and the schematic drawings of this Bed were presented.

• 산업기술연구
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• 제8권
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• pp.65-70
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• 1988

The intensity of ultrasound in liquid is calculated by improved analytic method. Helmholtz equation or Rayleigh's proposition does not offer the analytic solution. Considering a bounded medium, the use of the image source method in electromagnetic thoery gives a new way of calculating the total ultrasonic intensity in liquid. Some methods of measuring the intensities are also mentioned.

• 한국균학회지
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• 제34권2호
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• pp.79-83
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• 2006

톱밥종균, 성형종균 및 액체종균 등을 사용함에 따른 생산성 차이를 조사하기 위해 연구하였다. 배양 중의 배지오염 여부를 확인한 결과, 액체종균 접종구에서는 오염이 없었고 톱밥종균과 성형종균 접종구의 오염율은 각각 6.7%였다. 3주기에 걸친 버섯 발생작업을 통해서 톱밥종균, 성형종균, 액체종균 접종구에서 각각 725.1g, 726.2g, 573.9g의 버섯을 수확했다. 배지당 버섯발생 개체수는 톱밥종균과 성형종균 접종구의 배지들에서 57.4개, 64.3개가 발생한 반면에 액체종균 접종구에서는 45.1개가 발생했다. 배지당 버섯수확량에 있어서 톱밥종균 접종구에서는 1,000g 이상 수확된 배지가 없지만 성형종균과 액체 종균에서는 배지의 13%와 7%로. 나타났다. 그리고 톱밥종균 접종구 배지의 79%, 성형종균 접종구 배지의 53%, 액체종균 접종구 배지의 33%에서 $600{\sim}999g$의 버섯이 수확되었다. 발생 주기에 따른 수확량을 비교해 보면, 액체종균 접종구는 다른 두 접종구에 비해 1주기에서는 수확량이 적은 반면에 2주기 및 3주기에는 수확량이 오히려 더 높은 것으로 나타났다.

• 한국광학회:학술대회논문집
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• 한국광학회 2007년도 동계학술발표회 논문집
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• pp.92-93
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• 2007

• KSBB Journal
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• 제27권5호
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• pp.301-307
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• 2012

The hyphal growth, production of color pigments and monacolin K by Monascus strains were investigated in liquid medium. Thirty five different strains were collected and cultured in potato dextrose yeast extract broth (PDYB), potato dextrose broth (PDB) and malt extract broth (MEB) medea at $25^{\circ}C$ for 7 days. The growth rates of most of strains were highest in PDYB medium. Growth rate as well as pigment production were influenced by suspension conditions of mycelia during liquid cultivation. Most of strains producing monacolin K corresponded to strains producing red pigment highly and showing more pH changes of liquid media. Monacolin K produced from strains was detected in culture broth as well as mycelia. Any citrinin was not detected in monacolin K producing strains. These results imply that the selection of the strains producing red pigment highly and showing more pH changes in liquid cultivation could be applied for primary screening of Monascus strains for preparation of red mold rice.

• 한국초전도ㆍ저온공학회논문지
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• 제23권1호
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• pp.7-11
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• 2021

Cryogenic vessels are special equipment that requires periodic evaluation of their thermal insulation performance. At the current standard, the test is considered as the loss product or heat leakage of cryogenic vessel, which takes over 72 h to evaluate; consequently, a large amount of working medium is discharged to the environment in the process. However, hydrogen is flammable and explosive, and the discharged gas may be dangerous. If liquid hydrogen is replaced with liquid nitrogen before testing, the operation then becomes complicated, and the loss product or heat leakage cannot respond to the thermal insulation performance of cryogenic vessels for liquid hydrogen. Therefore, a novel method is proposed to evaluate the heat leakage of cryogenic vessels for liquid hydrogen in self-pressurization. In contrast to the current testing methods, the method proposed in this study does not require discharge or exchange of working medium in all test processes. The proposed method is based on one-dimensional heat transfer analysis of cryogenic vessels, which is verified by experiment. When this method is used to predict the heat leakage, the comparison with the experimental data of the standard method shows that the maximum error of heat leakage is less than 5.0%.

• Plant Resources
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• 제6권2호
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• pp.153-158
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• 2003

Effects of shaking, medium consistency and anther density on polyhaploid production in two wheat cultivars, Pavon and Chris, were studied using a modified 85D12 medium. Pavon produced more calli in shaking and more albino plants tban Chris. However, Chris produced threefold more green plants than Pavon in non-shaking treatment. More calli and green plants were derived from non-shaking treatment than those from shaking treatment. Anthers were cultured on both liquid and semi-solid 85D12 media, using two anther densities, 48 and 96 anthers per plate. Although Pavon generally produced more calli and albino plants than Chris, Chris produced more green plants than Pavon. More green plants were derived from semi-solid medium than those from liquid medium. A factor that may affect plant regeneration from anthers is the length of time on initiation medium. Most of the calli for both genotypes were transferred during the first two time periods. Fertility, as measured by seed set, was determined for all surviving regenerated plants. About 24% of Chris and Pavon anther-derived green plants in the experiment of medium consistency and anther density produced seed.

• 한국식품조리과학회지
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• 제4권2호
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• pp.65-69
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• 1988

세 가지 액체배지를 사용하여 Berkeley대학 Dr. Bjeldanes Lab에서 isolate된 F. moniliforme을 생육시킨 결과 Czapek-Dox medium에서 Fusarin C생성량이 가장 높았으며 옥수수에 비하면 약 1/10정도의 양인 것으로 나타났다. 그리고 Czapek-Dox medium의 경우 $28^{\circ}C$에서 2주간 배양한 때에 Fusarin C의 생성량이 가장 많았으며 옥수수의 경우는 28$^{\circ}C$에서 1주간 배양한 때에 가장 높았다. 또한 Czapek-Dox medium의 initial PH가 6.5인 때에 Fusarin C의 생성량이 최대이었으며 6.3, 5.9인 때도 다른 PH보다 월등히 높은 양이 생성됨을 확인할 수 있었다.

• 한국약용작물학회지
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• 제15권5호
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• pp.346-351
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• 2007

An efficient somatic embryogenesis and plant regeneration protocol was developed for Schisandra chinensis Baill, using embryogenic cell suspensions and optimized media conditions. Friable embryogenic callus was induced from cotyledonary leaf and hypocotyl explants of 7 days old seedlings on MS agar medium supplemented with 1.0 to $4.0\;mg\;l^{-1}$ of 2,4-dichlorophenoxyacetic acid (2,4-D). Fast growing and well dispersed embryogenic cell suspensions were developed within two months when embryogenic calli were transferred to MS liquid medium containing $1.0\;mg\;l^{-1}\;2,4-D$. One third strength of MS medium was the best for both overall growth and development of somatic embryos in liquid culture. Over 3400 viable somatic embryos were produced from each 150 ml flask with an initial cell density of 30 mg in 30 ml medium. Germinated somatic embryos developed in liquid medium converted into plantlets after transferred to half-strength MS semi-solid medium. Approximately 90% of the converted plantlets were successfully transplanted to soil and grew into fertile plants.

• 한국버섯학회지
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• 제10권1호
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• pp.3-8
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• 2012

본 연구에서는 효율적으로 팽나무버섯 액체종균을 생산할 때에 폭기(공기방울을 매우 작게하여) 배양의 효과에 대하여 액체 배지 내 이산화탄소 농도와 잔류 유리당 함량 변화로써 측정하였다. 이산화탄소 농도는 폭기 진행 중 배양용기의 배출구에서 측정하였다. 액체종균은 폭기 배양 3일째에 균사생장이 급격히 증가하였으며, 이산화탄소 농도($CO_2$)도 급증하였으나 폭기 5일째에는 정점을 나타낸 후 감소하였다. 액체배지 내 환원당은 배양 7일째까지 일정 속도로 감소되었고 이후에는 검출되지 않았고, 침전 균사체의 중량은 3일째 이후 비슷한 수준으로 유지되었다. 총질소(T-N)량은 폭기 11일째까지 일정한 수준으로 감소되었다. 유리당의 함량은 폭기 배양 7일째에 가장 낮았으므로 폭기 배양 6~7일째에 접종원으로 사용하는 것이 가장 효과적인 것으로 생각되었다. 그리고 액체종균의 배양 중에 배출구에서의 이산화탄소 농도 측정은 저비용으로 액체종균의 균사배양 정도를 추정하는 간이 지표로 이용할 수 있을 것으로 판단되었다.