https://repository.kopri.re.kr/handle/201206/12721 Sat, 29 Aug 2026 02:46:33 GMT 2026-08-29T02:46:33Z https://repository.kopri.re.kr/handle/201206/16825 Title: The chromosome numbers, ploidy levels, and Genome sizes of Svalbard plants Authors: Lee, Yoo Kyung Abstract: Background: Accurate estimation of genome size and determination of ploidy levels are fundamental for understanding plant genome architecture and their adaptive strategies in extreme environments. The Arctic region of Svalbard hosts a distinct vascular plant flora adapted to harsh climatic conditions, but comprehensive cytogenetic data remain scarce. This study compiles and analyzes chromosome numbers, ploidy levels, and genome sizes (C-values) for 188 plant taxa of Svalbard, providing essential baseline data for evolutionary and ecological research. Results: Chromosome counts in Svalbard flora range from 2n = 10 to 270, with modal base numbers of x = 7 and x = 8. Polyploidy is widespread, with diploids representing 94 taxa followed by tetraploids, hexaploids, and higher even ploids. Genome sizes (1C-values) exhibit considerable variation both within and between families. Notably, chromosome number and genome size are decoupled in Cyperaceae and Poaceae, attributed to the difference of chromosome size. The prevalence of polyploid taxa is linked to increased genetic diversity and potential epigenetic mechanisms promoting survival in the Arctic’s cold, nutrient-poor, and short growing season environments. Conclusions: This comprehensive cytogenetic dataset provides a critical foundation for ongoing and future studies on plant adaptation, evolution, and genome dynamics in Arctic ecosystems. The findings underscore the ecological importance of polyploidy and genome structural variation in shaping the resilience of polar flora under climatic stress and global change. These data will enhance molecular, ecological, and conservation research efforts in Svalbard and other high-latitude regions. Sun, 01 Feb 2026 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16825 2026-02-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16896 Title: evelopment of technology to cope with senile diseases using polar fish characteristics Authors: Kim, Jin-Hyoung Tue, 27 Jan 2026 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16896 2026-01-27T00:00:00Z https://repository.kopri.re.kr/handle/201206/16478 Title: Development and Evaluation of a Ground CO2 Measurement System Authors: Park, Keunbo Abstract: 지구 평균 기온 상승은 산업화 이후 증가한 온실가스 배출과 밀접한 관련이 있으며, 특히 고위도 지역의 영구동토층 해빙은 저장된 유기탄소의 대기 방출을 통해 지구가열화를 가속할 잠재성이 크다. 이에 따라 동토？대기 경계면에서 발생하는 CO2 교환 특성을 정량적으로 규명하기 위한 정밀 현장 관측 기술의 필요성이 증대되고 있다. 본 연구에서는 이러한 과학적·정책적 요구에 대응하여 비분산적외선(NDIR) 분광 원리를 기반으로 한 정밀 CO2 측정시스템을 설계·제작하였다. 측정 시스템은 MCU 기반 제어기, 실시간 보정 알고리즘, 통신 모듈 및 GUI 기반 시각화 시스템을 통합하여 안정적으로 운용 가능하도록 구현하였다. 개발된 측정 시스템은 표준가스를 이용한 영점 및 스팬 교정 기능을 포함하며, 이동평균 및 적응형 필터 기반 신호 처리, 비정상 신호 제거 알고리즘, 실시간 데이터 로깅 기능을 적용하였다. 성능 검증은 0.600 ppm, 429.860 ppm, 953.550 ppm의 CO2 표준가스를 이용해 정확도, 정밀도, 응답시간, 선형성 및 영점 안정성을 평가하는 방식으로 수행하였다. 실험 결과, 모든 농도 구간에서 측정값은 표준가스 농도와 일치하는 수준을 유지하였으며, 정확도 ±1% 이내, 정밀도 0.560 이하, 장기 영점 드리프트를 포함하여 상용되고 있는 정밀 측정 시스템(LI-COR LI-7810)와 동등한 성능을 확보하였다. 또한 1:1 비교 분석에서 두 장비의 측정값은 높은 상관성을 보이며 우수한 선형성을 나타냈다. Mon, 01 Dec 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16478 2025-12-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16479 Title: Stepwise Cooling Events in the Western Arctic at 8.2 and 4.2 ka: Proxy Development and Application Authors: K. Suzuki; M. Yamamoto; Park, Yu-Hyeon; Nam, Seung-il Abstract: Hydroxylated glycerol dialkyl glycerol tetraether (GDGT)­based proxies have recently been proposed for reconstructing sea surface temperatures (SSTs) in polar oceans, but their reliability has not yet been sufficiently validated. We investigated the spatial distribution of hydroxylated GDGTs in surface sediments from the western Arctic Ocean and the Bering Sea to evaluate the reliability of these proxies and apply them to a sediment core from the Chukchi inner shelf to reconstruct Holocene SST variability. Among the four tested proxies, the RI­OH’ index shows the strongest correlation with annual mean SST, marking it the most reliable and well­calibrated SST proxy for this region. The RI­OH’­based SST reconstruction reveals two major cooling events at 9.1？8 ka and 4.6？3.7 ka. The earlier event coincides with intensified inflow of cold Pacific Winter Water into the Chukchi Sea, while the latter event is linked to expanded sea ice cover and advance of Alaskan glaciers, likely driven by regional shifts in atmospheric and oceanic circulation. A brief SST decline at 8.3 ka, concurrent with the well­known 8.2 ka event, is observed for the first time in the western Arctic Ocean. The latter cooling episode aligns with the 4.2 ka climate event across the Northern Hemisphere, suggesting that the Arctic climate dynamics contributed to the broader Holocene climatic transition. Mon, 01 Dec 2025 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16479 2025-12-01T00:00:00Z