지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Nitrate reductase (NR) is activated by nitrogen sources (NO3- and NH4+) and irradiance. This study investigated the effects of these factors on the NR activity of Ulva pertusa (Chlorophyta) and Ecklonia cava (Phaeophyta). In addition, the ammonium (NH4+) and nitrate (NO3-) uptake rates of the two species were examined. U. pertusa took up most of the N03- and NH/ in the medium during a 3hour incubation, while E. cava had a relatively high uptake rate after 3 hours. The NR activities of the two species were affected by the nitrogen source and irradiance and were highest when they were exposed to NO3--rich medium and high irradiance. However, the patterns of NR activity differed between the two species. In N03--rich medium and high irradiance, U. pertusa achieved the highest NR activity (2.01 ± 0.07 μmol NO2- g-1 DW h-1) within the first 3 hours and then this activity decreased drastically. By contrast, the NR activity of E. cava (0.36 ± 0.04 μmol NO2- g-1 DW h-1) was constant for 12 hours. When exposed to darkness, the NR activity of U. pertusa decreased dramatically, while that of E. cava increased gradually for 12 hours. Therefore, E. cava is able to maintain NR activity during the dark because of its adequate carbohydrate reserves and substrate.
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UCI(KEPA) : I410-ECN-151-24-02-090173189