• The Korean Journal of Physiology and Pharmacology
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• 제20권5호
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• pp.499-505
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• 2016

The quantitative sudomotor axon reflex testing (QSART) is a classic test of routine postganglionic sudomotor function. We investigated sudomotor function by QSART after summer (July 2012) and winter (January 2013) seasonal acclimation (SA) in the Republic of Korea. QSART with acetylcholine (ACh) iontophoresis were performed to determine directly activated (DIR) and axon reflex-mediated (AXR1, 2) sweating rate. Onset time of axon reflex, activated sweat gland density (ASGD), activated sweat gland output (ASGO), tympanic and skin temperatures ($T_{ty}$, $T_{sk}$), basal metabolic rate (BMR), and evaporative loss volume changes were measured. Tympanic and mean body temperature (${\bar{T}}_b$; calculated from $T_{ty}$, $T_{sk}$) were significantly lower after summer-SA than that of winter-SA. Sweat onset time was delayed during winter-SA compared to that after summer-SA. BMR, AXR(1), AXR(2), and DIR sweat rates, ASGD and ASGO, and evaporative loss volume were significantly diminished after winter-SA relative to after summer-SA. In conclusion, changes in sweating activity measured by QSART confirmed the involvement of the peripheral nervous system in variation of sudomotor activity in seasonal acclimation.

• 한국수산과학회지
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• 제35권5호
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• pp.463-468
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• 2002

본 연구는 계절적으로 다른 수온에 순화되어 있는 패류에 대한 승온 효과를 분별하고 특히 시기별로 성장이 다른데 따른 승온 효과를 판별하기 위해 수행하였다. 실험 동물은 남해안 산 참굴, Crassostna gigas, 바지락, Ruditapes philippinarum 및 진주담치, Mytilus edulis의 3종이었으며 각 계절별로 채집하여 순화되어 있는 계절 수온과 순화 온도보다 4, 7 및 $10^{\circ}C$와 3, 6 및$ 9^{\circ}C$로 승온시킨 실험 해수에서 표준산소소비량과 여수량을 측정하였다. 생활사로 보아 가을에 치패기에 있는 참굴은 $14^{\circ}C$ 순화 수온 이상의 수온상승은 오히려 생리적 저해를 주었고 순화 수온이 $7^{\circ}C$인 겨울에는$ 9^{\circ}C$의 승온도 효과적이었다. 그러나 성재에서 여름에 순화 수온 $24^{\circ}C$ 이상의 승온은 저해를 주었다. 봄에 치패기에 있는 바지락은 순화수온보다 $6^{\circ}C$의 승온도 효과가 현저하였으나 그 이상의 수온 상승은 오히려 저해를 주었고 가을과 겨울에는 순화수온보다 온도가 $9^{\circ}C$까지 승온되어도 현저히 효과적이었다. 그러나 여름에는 순화수온 $24^{\circ}C$ 이상의 승온은 현저한 저해영향을 주었다. 진주담치는 봄 치패기에 순화수온보다 $3^{\circ}C$ 승온은 매우 효과적이었으나 그 이상 수온 상승은 저해를 주었다. 여름과 가을의 순화수온보다 높은 수온상승은 영향이 경미하였으며, 겨울에는 승온되어도 별다른 승온 효과를 보이지 않았다. 이상으로 보아 온배수의 승온 효과는 패류의 생활사 중 겨울에는 매우 효과적이었으나 치패기에 있어서는 순화 수온 보다 다소 높은 수온 상승도 오히려 저해 영향을 줄 수 있는 것으로 나타났다.

• 한국잠사곤충학회지
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• 제39권1호
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• pp.1-11
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• 1997

In relations to cold acclimation, experiment was carried out to understand the seasonal changes in reserve substances of the mulberry. The shoot barks and leaves of three mulberry varieties(Kaeryangppong, Shinilppong and Yongcheonppong) were sampled, after that their reserve substances were analyzed. The cold hardiness of mulberry was investigated by DTA(Differential Thermal Analysis) method. To increase cold hardiness, gibberellin(100 ppm), kinetin(100 ppm) and Jambi 8 were sprayed on the mulberry leaves. After spraying, falling of the leaves of Yongcheonppong occured earier than the other varities. After the first frost, all of treatments except gibberellin were entirely fallen. Growth regulator extended the leaves fallen. After spraying, water of the shoot barks was not showed difference in the content among the treatments, but amino acid, carbohydrate and soluble protein increased from September to October. Starch content of the shoot barks and leaves was maximum in October, but thereafter decreased during wintering stage. In Shinilppong, Jambi 8 spray increased cold hardiness by 1-2$^{\circ}C$ more than no spray. It was concluded that the cold hardiness of the mulberry in midwinter is closely related to the reserve substances with spraying Jambi 8 on the mulberry leaves.

• 대기
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• 제17권4호
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• pp.463-470
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• 2007

This study aims to assess the impact of the hot summer weather on daily mortality in Busan. Daily total all-caused mortality in the entire population in Busan has been examined during 1991-2005. The daily deaths were standardized to account for the long-term trend in mortality and their seasonal and weekly cycles. We found the net increase (about 8.2%) of excess deaths during the extraordinary heat wave period in July of 1994. It corresponds to the excess deaths of 109.5 during the month. The abnormality of temperature extremes in July of 1994 and their impacts on human health were also investigated. Unusual heat wave appeared in the first ten days in July of 1994. The excess deaths are likely to be attributable to the record-breaking heat waves. The result suggests that unusual early heat waves would be dangerous, even for inhabitants who live in an acclimated region to the heat waves such as Busan.

• Journal of Ginseng Research
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• 제32권4호
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• pp.347-356
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• 2008

Forest-grown American ginseng (Panax quinquefolius L.) is exposed to daily and seasonal light variations. Our goal was to determine the effect of understory light changes on the maximum quantum yield of photosystem II, expressed as $F_v/F_m$, and photosynthetic pigment composition of two-year-old plants. Understory light photon flux density and sunfleck durations were characterized using hemispherical canopy photography. Our results showed that understory light significantly affected the $F_v/F_m$ of American ginseng, especially during the initial development of the plants when light levels were the highest, averaging 28 mol $m^{-2}d^{-1}$. Associated with low $F_v/F_m$ during its initial development, American ginseng had the lowest levels of epoxidation state of the xanthophyll cycle of the season, suggesting an active dissipation of excess light energy absorbed by the chlorophyll pigments. As photon flux density decreased after the deployment of the forest canopy to less than 10 mol $m^{-2}d^{-1}$, chlorophyll a/b decreased suggesting a greater investment in light harvesting pigments to reaction centers in order to absorb the fleeting light energy.

• 한국환경과학회지
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• 제19권1호
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• pp.17-26
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• 2010

To understand the initial changes in the microbial activities of wetland soil after construction, dehydrogenase activity (DHA) and denitrification potential (DNP) of soil from 1 natural wetland and 2 newly constructed wetlands were monitored. Soil samples were collected from the Daepyung marsh as a natural wetland, a treatment wetland in the West Nakdong River, and an experimental wetland in the Pukyong National University, Busan. The results showed that the DHA of the natural wetland soil was 6.1 times higher than that of the experimental wetland and similar to that of the treatment wetland 6 months after wetland construction (fall). Few differences were observed in the DNP between the soil samples from the natural wetland and 2 constructed wetlands four months after wetland construction (summer). However, 6 months after the construction (fall), the DNP of the soil samples from the natural wetland was 12.9 times and 1.8 times higher than that of the experimental wetland and the treatment wetland, respectively. These results suggested that the presence of organic matter as a carbon source in the wetland soil affects the DHA of wetland soil. Seasonal variation of wetland environment, acclimation time under anaerobic or anoxic wetland conditions, and the presence of carbon source also affect the DNP of the wetland soil. The results imply that the newly constructed wetland requires some period of time for having the better contaminant removal performance through biogeochemical processes. Therefore, those microbial activities and related indicators could be considered for wetland management such as operation and performance monitoring of wetlands.

• 환경생물
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• 제26권1호
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• pp.22-29
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• 2008

무당개구리(Bombina orientalis, Korean fire-bellied toad)는 양서강 개구리목 무당개구리과 무당개구리속(Class Amphinia, Order Anura, Family Bombinatoridae Genus Bombina)의 무미양서류이다. 소형으로 행동이 느리고 온순하여 취급이 용이하며 실험모델로써 많은 장점이 있으나 번식기를 제외한 개체를 대상으로 한 연구는 시료확보의 난점으로 무당개구리의 계절번식 특성에 대한 연구는 미진하다. 최근 지구온난화의 직간접적인 영향으로 전 세계적으로 무당개구리를 포함한 많은 양서류가 감소하고 있으며 야생채집개체를 활용하는 연구는 점차 규제를 받을 것으로 사료된다. 이전 연구에서 시행되었던 바이오톱 조성 목적과 달리 양서류 번식생물학적 연구를 위한 자연서식환경 조성은 시도되지 않았다. 본 연구는 무당개구리의 생식, 발생, 생태연구를 실험실 환경에서 수행하기 위한 목적으로 자연서식환경을 모방한 biotope 계획과 조성지침, 그리고 표준처리절차(SOP)를 제시하였다. 조성 후 시험적으로 방사한 개체연구결과로 는 실내사육실에서 키웠던 개체와는 달리 자연생태환경에서 관찰되는 계절적 적응현상을 관찰할 수 있었다. 본 지침서를 기초로 조성된 양서류 biotope을 활용하면 온대지방에 서식하는 양서류의 계절번식 생태를 실험실 환경에서 연구하는 데 유용할 것으로 사료된다.