• 한국작물학회지
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• 제60권2호
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• pp.146-152
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• 2015

본 연구는 국내 조생종 벼 품종들과 농촌진흥청 국립식량과학원에서 육성된 자포니카(Oryza sativa L. ssp. Japonica)의 조생 다수성 품종인 남일 돌연변이 계통인 중모1024의 등숙기 고온내성을 비교 평가하여 등숙기 고온내성의 기초자료를 얻고자 수행하였다. 본 연구를 통하여 국내 조생종벼 품종들 중 대봉, 운광, 및 만안과 돌연변이 계통인 중모 1024가 고온에서 상대적으로 양호한 고온내성을 가지고 있는 것으로 평가되었으며. 특히 중모1024는 다른 공시품종들에 비하여 상당히 양호한 고온내성을 가진 것으로 평가되었다. 본 연구의 주요 결과는 등숙기간 동안 고온에 의하여 현미의 길이와 너비가 감소하였으며, 현미 너비의 감소율이 현미 길이의 감소율에 비하여 평균 4배 이상 높았다. 이러한 결과로 보아, 등숙기간 동안 고온에 의하여 현미의 길이보다는 너비가 더 많은 영향을 받는다고 사료된다. 등숙기간 동안 고온에 의해 가장 문제가 되는 완전미율과 미숙립율을 공시품종들간 비교 평가한 결과, 상대적으로 중모 1024, 태봉, 운광 및 만안이 고온에서 높은 현미완전미율을 보였으며, 상대적으로 적온에서 낮은 현미완전미율을 보인 품종들이 상대적으로 고온에 의한 현미완전미율 감소율이 적온에서 높은 현미완전미율을 보인 품종들에 비해 낮았다. 또한, 다른 공시품종들에 비하여 고온내성이 양호한 중모 1024는 고온에서도 좋은 쌀 외관품위와 안정적 수확성 향상을 위한 육종모재로서 유용형질을 교배를 통해 고품질 벼의 보완을 위해 이전할 수 있는 것이 용이할 것으로 사료된다.

• International Journal of Industrial Entomology and Biomaterials
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• 제2권2호
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• pp.123-127
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• 2001

In order to introduce bivoltine races in a tropical country like India, it is necessary to have stability in cocoon crop under high temperature environments. Unlike any temperate country like Japan, the rearing conditions/environment, climatic conditions, quality of mulberry leaf and incidence of diseases are unpredictable in India. Geneticists and breeders of all the sericultural countries have experienced the influence of environment during the process of breeding. in order to select efficiently the breeds with high temperature tolerance, it is verb important to analyse clearly the heritability nature of high temperature tolerance. In light of the above, the present study was undertaken to determine the effect of high temperature treatment of (A) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 24 hrs continuously, (B) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 48 hrs continuously and (C) the control (25${\pm}1^{\circ}$ and 65${\pm}$5% RH in the normal rearing condition from the $3^{rd}of5^{th}$ instar on the pure races such as Moria, Nl37 and Cl46 as well as their Fl hybrids. The overall performance indicate that the hybrids are mare tolerant than the pure races. it was also observed that the overall performance declined in those batches where 48 hrs treatment was given. The most interesting observation noticed in this study was that there was maternal effect regarding temperature tolerance as evident from the better performance of those hybrids where the female parent used was more tolerant as pure race.

• 한국미생물·생명공학회지
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• 제24권6호
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• pp.726-732
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• 1996

To improve the fermentation characteristics(such as starch-degradability, ethanol tolerance, sugar and high-temperature tolerance) of recombinant haploid yeast Saccharomyces diastaticus K114, hybridization technique was used. The hybridization partner was S. diastaticus 1177 which had good glucoamylase activity and fermentabi- lity. The best hybrid HH64 showed improved ethanol tolerance, sugar and high-temperature tolerance. Especia- lly, the starch-fermentability was significantly improved, since the hybrid produced 1.60% (w/v) ethanol from 4% (w/v) starch, while the recombinant haploid K114 produced 1.30% (w/v) ethanol. The optimum temperature and pH for the starch-fermentation by the hybrid HH64 was 30$\circ$C and 5, respectively. The hybrid yeast HH64 produced 7.5% (w/v) ethanol directly from 20% (w/v) starch.

• 한국생산제조학회지
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• 제19권5호
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• pp.609-615
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• 2010

Angular contact ball bearings in a high speed spindles are under the extreme conditions, such as high temperature, big centrifugal force and thrust cutting forces. So, the assembly contacts between spindle shaft and inner ring bearings, bearing housing and outer ring of bearings are occasionally unstable at high speed revolution. Furthermore, the ball contact angle of a bearing, which influence stiffness and lifetime of bearings, are changed according to loads and rotational speed. To analyze internal forces of a bearing under high speed revolution, the ball contact are calculated using nonlinear equations in consideration of rotational speed, thrust loads and raceway form. Diameter increase of inner and outer ring by influence factors, such as internal forces to inner and outer ring, centrifugal force and temperature of inner and outer rings are calculated to establish stable state in bearing assembly in high speed spindle. Finally, contribution ratio of influence factor to assembly design tolerance of inner and outer rings are shown and the stable assembly design tolerance are proposed.

• 한국지역사회생활과학회지
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• 제17권2호
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• pp.49-60
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• 2006

It was measured the energy expenditure in each season, the cold tolerance in winter and the heat tolerance in summer. Farmers' adaptability to the change of environment was compared with those of city-dwellers such as indoor workers and street cleaners to determine the effect of living environment, especially living temperature, on the health of human body. It turned out that farmers had experienced wide range of temperature that was higher in summer and lower in winter than indoor workers. Farmers and street cleaners showed seasonal adaptation in energy expenditure, which was high in winter and low in summer. However, indoor workers did not show seasonal changes. Energy expenditure had an inverse correlation with the temperature in work place where subjects spend the longer time in a day except in female indoor workers in Seoul. And It was proved that farmers and street cleaners had stronger cold tolerance and heat tolerance than indoor workers.

• The Plant Pathology Journal
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• 제28권1호
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• pp.101-106
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• 2012

Trifloxystrobin is a strobilurin fungicide, which possesses broad spectrum control against fungal plant diseases. We demonstrated that pre-treating red pepper plants with trifloxystrobin resulted in increased plant growth and leaf chlorophyll content compared with those in control plants. Relative water content of the leaves and the survival rate of intact plants indicated that plants acquired systemic tolerance to drought stress following trifloxystrobin pre-treatment. The recovery rate by rehydration in the drought treated plant was better in those pre-treated with trifloxystrobin than that in water treated plants. Induced drought tolerance activity by trifloxystrobin was sustained for 25 days after initial application. The trifloxystrobin treated red pepper plants also had induced systemic tolerance to other abiotic stresses, such as frost, cold, and high temperature stresses. These findings suggest that applying the chemical fungicide trifloxystrobin induced systemic tolerance to certain abiotic stresses in red pepper plants.

• 환경생물
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• 제40권3호
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• pp.247-254
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• 2022

본 연구는 자연에서 채집한 불볼락(Sebastes thompsoni)을 대상으로 고 수온 노출에 따른 생물의 행동반응 및 내성 한계(tolerance limit)를 규명하기 위하여 연속적으로 행동관찰이 가능한 추적시스템을 사용하여 노출 수온구간별 행동패턴의 변화, 임계 수온범위 및 아치사 행동반응을 분석하였다. 실험 결과, 대조수온(15.0℃)을 20.0℃로 높였을 때, BI (behavioral index)는 노출 초기 10시간 동안 일시적으로 증가하였으나 60~70시간 동안 뚜렷한 행동의 변화 없이 일정한 속도로 안정된 유영 패턴을 보였다. 그러나, 25℃에서는 활동량의 급격한 저하, 30℃에서는 활동성 지연과 정지행동 등과 같은 비정상적 유영 및 대사활동 교란이 확인되었으며, 온도의 상승에 따라 개체의 사망률이 높아지는 경향을 보였다. 이러한 결과는, 불볼락의 수온에 대한 내성한계는 25.0~30.0℃이며 생존에 큰 영향을 미치는 수온은 30.0℃ 부근임을 나타낸다. 본 연구의 결과가 효과적인 불볼락의 양식을 위한 환경 조건 설정에 도움을 줄 것으로 기대한다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.142-142
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• 2017

Wheat (Triticum asetivum L.) is one of the major grain crops worldwide. The reduced productivity ascribed by adverse environment is increasing the risk of food security. Wheat cultivars have been actively released by public side since 1960s in Korea. Each variety has been developed for superior regional adaptation, pest resistance and mostly high yield. Heat stress tolerance is one of the major parameters that threaten wheat production in Korea. Heat stress during grain filling period has been conceived as critical level and directly influences on wheat production. We evaluated 11 common wheat cultivars ("Baegjoong", "Dajung", "Goso", "Hanbaek", "Jokyoung", "Joeun", "Jopum", "Keumgang", "Olgeuru", "Sinmichal", "Uri") that were exposed to abnormally high temperature during the grain filling period. Each plant was grown well in a pot containing "Sunshine #4" soil in controlled phytotron facility set on $20^{\circ}C$ and 16 h photoperiod. At 9 day-after-anthesis (DAA9), plants were subjected to a gradual increase in temperature from $20^{\circ}C$ to $33^{\circ}C$ and maintained constantly at $33^{\circ}C$ for 5 days. After the treatment, plants were subjected to gradual decrease to normal temperature ($20^{\circ}C$) and continue to grow till harvest. Seeds were harvested from each tiller/plant. Total chlorophyll contents decrease level as well as grain parameters were measured to evaluate varietal tolerance to heat stress. We also divide each spike into five regions and evaluate grain characteristics among the regions in each spike. The obtained results allow us to classify cultivars for heat stress tolerance. The pedigree information showed that typical wheat lines provide either tolerance or susceptible trait to their off-springs, which enable breeders to develop heat stress tolerance wheat by appropriate parental choice.

• 한국전기전자재료학회논문지
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• 제16권1호
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• pp.46-52
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• 2003

In this paper, we fabricated PRT(platinum resistance thermometers) with the trimming technology using high fine laser system. U. V.(wavelength： 355nm) laser was mainly used for adjusting Pt thin films resistors to 100Ω at 0$^{\circ}C$. Internationally, the accepted A-class tolerance of temperature sensor is ${\pm}$0.06Ω at 0$^{\circ}C$. according to DIN EN 60751. The width of trimmed lines was about 10$\mu\textrm{m}$ and the best trimming conditions of Pt thin films were power : 37mW, frequency : 200Hz and bite size：1.5$\mu\textrm{m}$. And 96 resistors, fabricated by photolithography and etching process, have 79∼90Ω and 91∼102Ω as the proportion of 45.7% and 57.3%, respectively. As result of sitting Pt thin films resistors to the target value(109.73Ω at 25$^{\circ}C$), 82.3% of all resistors had the tolerance within ${\pm}$0.03Ω and the others(17.7％) were within ${\pm}$0.06Ω of A-class tolerance. The PRTs which wore fabricated in this research had excellent characteristics as follows； high accuracy, international standard TCR(temperature coefficient of resistance) value, long-term stability, wide temperature range, good linearity and repeatability, rapid response time, etc.

• 한국수산과학회지
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• 제44권3호
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• pp.276-283
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• 2011

The growth and tolerance for water temperature and salinity were compared among red sea bream Pagrus major (RSB) black sea bream Acanthopagrus schregeli (BSB) and their hybrid ($F_1$), female RSB ${\times}$ male BSB. The growth of the $F_1$ fish did not differ until 27 days after hatching (dAH), after which the most rapid growth was observed until approximately 300 dAH, followed by RSB and BSB. However, the RSB had out grown the $F_1$ fish by approximately 303 dAH. By 480 dAH, the RSB were largest, followed by the $F_1$ and BSB groups. The tolerances for high and low water temperature were significantly different for each species and growth stage. The largest tolerance spectrum was observed in the BSB group, and the tolerance spectrums gradually decreased with increasing final body weight. During the salinity tolerance trials, all of the species started to die following transfer into freshwater (0 psu). BSB showed the highest survival rate when kept in fresh water for an average of 29.9 hours, while the $F_1$ fish were more tolerant than the RSB fish. The fish were increasingly tolerant to fresh water and changes in water temperature as they grew, while the size of the temperature spectrum remained unchanged but shifted to a lower temperature range with growth. Our results demonstrate that $F_1$ performed well in terms of growth compared to parental fish, with higher temperature and salinity tolerances than RSB, and is thus suggested to be a suitable aquaculture species for Korea and northeast China.