• ALGAE
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• 제27권4호
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• pp.249-258
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• 2012

Nongeniculate coralline red algae are a common element of the Brazilian coastal zone, especially associated to coral reefs. During the course of ecological studies at Parque Municipal Marinho do Recife de Fora, two species of non-geniculate Corallinales were the major organisms covering the reef. Analyses of the vegetative and reproductive features of the species were analyzed; indicating that one new species of the genus Lithothamnion is proposed here based on the combination of several features associated with anatomy of the tetrasporangial conceptacles in relation to other species of the genus for which modern accounts are available. This new proposal along with other new species, new combinations and range extension of some species of the genus based in similar features clearly suggest that stability in species delimitation is possible. The second species found Pneophyllum conicum represents a range extension of more than 6,000 km from the Pacific in to the Atlantic Ocean suggesting that some nongeniculate species are widely distributed. The occurrence and abundance of these species supports and emphasizes the need for an extensive taxonomic reassessment of coralline red algae in the context of Brazilian coral reef biodiversity.

• ALGAE
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• 제17권2호
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• pp.89-93
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• 2002

Seasonal changes of pigment compositionin two intertidal red algae, Gloiopeltis furcata (Postels et Ruprecht) J. Agardh, and Porphyra yezoensis Ueda, were investigated. Chlorophyll α and phycoerythrin levels were high during winter, but decreased in late spring or summer, with accompanying discoloration from deep red to green or yellow. This discoloation corresponded closely to the fluctuationof phycoerythrin content. Nevertheless, photosynthesis capacity was maintained by the increasing water temperature in the field, suggesting that large amounts of phycoerythrin are not necessary for photosynthesis. Phycoerythrin conten correlated significantly with nitrogen content in both species when the nitrogen level was greater than the level of critical content (1.30% DW in G. furcata, and 2.26% DW in P. yezoensis), indicating that phycoerythrin plays a more important role in the nitrogen status as a nitrogen pool than that of nitrogen critical content. Furthermore, the dependence level of the alage on phycoerythrin as a nitrogen pool was greater in P. yezoensis than in G. furcata because of the remarkable increase of phycoerythrin content in P. yezoensis with increasing jnitrogen content.

• 한국수산과학회지
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• 제10권4호
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• pp.199-204
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• 1977

8종의 식용해조류 지질의 지방산을 GLC로 분석하고 해조류 종속간에 어떤 특징이 있나, 검토하여 다음과 같은 결과를 얻었다. 1) 해조류의 지질함량은 녹조류 $1.51\%$, 갈변류 $2.81\%$, 강조류 $1.02\%$로서 갈조류의 지질함량이 가장 높았다. 2) 지방산조성의 해조류 종속간의 함량 차이을 보면, 녹조류는 $C_{16:0}$산의 함량이 가장 높은 치를 나타내며, 동시에 $C_{18:1},\;C_{18:2},\;C_{18:3}$산의 함량도 높았다. 갈조류는 $C_{16:0}$ 및 $C_{18:1},\;C_{18:2},\;C_{18:3}$산의 함량이 비교적 높은 반면, $C_{18:0}$산은 다른 해조류에 비해 아주 낮은 함량치를 나타내고 있다. 홍조류는 $C_{16:0}$산의 함량이 높은 반면, $C_{14:0},\;C_{18:1},\;C_{18:2}$산의 함량이 매우 낮았다. 3) 조성지방산의 탄소수 $C_{14},\;C_{15},\;C_{16:},\;C_{18},\;C_{22}$의 분포를 보면, 녹조류는 $C_{16},\;C_{18}$산을, 녹조류는 $C_{16},\;C_{18},\;C_{22}$산을 각각 주요성분으로 하고 있다.

• ALGAE
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• 제28권4호
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• pp.297-305
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• 2013

There is increasing interest in the relationships between marine bacteria and red tide organisms. Some bacteria are known to kill red tide organisms, and may be responsible for accelerating the termination of red tides. Thus, certain algicidal bacteria have been proposed for the control of red tides. Meanwhile, many red tide organisms are known to feed on marine bacteria. The roles of marine bacteria and red tide organisms are therefore reversible. In Korean waters, the killing of red tide organisms by algicidal bacteria, and also the feeding of red tide organisms on marine bacteria have been extensively investigated. The findings of such studies may influence the conventional view of red tide dynamics, and also planktonic food webs. Here, we review the species and concentrations of algicidal bacteria that kill red tide organisms in Korean waters, as well as the ingestion rate and grazing impact of red tide organisms on marine bacteria. Furthermore, we offer an insight into the ecological roles of these 2 components in marine planktonic food webs.

• ALGAE
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• 제18권1호
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• pp.83-88
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• 2003

• 한국수산과학회지
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• 제30권3호
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• pp.428-431
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• 1997

국내연안에 자생하는 13종류의 홍조류를 남해안의 다대포, 광안리 그리고 송도에서 채취하여 구성성분 및 수용성 성분의 수율과 해조다당류의 이화학적 특성에 중요한 영향을 미치는 황산기 함량을 조사한 결과를 요약하면 다음과 같다. 회분함량은 꼬시래기의 경우 $8.57\%$로 가장 낮았으며 송도에서 채취한 붉은잎은 $30.23\%$로 종류에 따른 함량 차가 클 뿐만 아니라 같은 종류일지라도 채취장소에 따른 차이도 많았다. 단백질 함량은 광안리 풀가사리의 경우 $18.11\%$로 가장 낮았고 송도 붉은까막살의 경우 $33.90\%$로 가장 높았다. 지방은 $0.11\~0.90\%$로 모든 홍조류에서 함량이 $1\%$미만이었다. 수용성 성분의 수율은 남해안의 송도에서 채취한 붉은 까막살의 경우 $4.32\%$로 가장 적었고 광안리 깃꼴진두발은 $55.78\%$로 수율이 가장 많았다. 수용성 성분중의 황산기 함량은 1.65 (다대포 우뭇가사리) 가 $19.48\%$ (송도 돌가사리)로 종류에 따른 황산기 함량의 차이가 매우 큰 것으로 나타났다. 홍조류에서 추출한 수용성 성분의 구성당은 3,6-anhydrogalactose (An-Gal), galactose (Gal), 6-methyl-galactose (6-Me-Gal), rhamnose (Rha), fucose, ribose (Rib), arabiose (Ara), xylose (Xyl), manose (Man) 그리고 glucose (Glu)였다. 그리고 구성당을 GC로 분석한 결과 함량이 가장 높은 당은 Gal였으며, 다음으로는 An-Gal, Glu, Xyl 순이었다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2008년도 춘계학술대회
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• pp.178-182
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• 2008

The bleached red algae fiber(BRAF) showed very similar crystallinity to the cellulose, furthermore, it has higher thermal decomposition temperature than that of the microcrystalline cellulose(MCC). Polypropylene biocomposites reinforced with BRAF have been fabricated with various BRAF contents by compression molding method and their mechanical and thermomechanical properties have been studied. The mechanical strength as tensile, impact and flexural modulus of BRAF/PP biocomposites were gradually improved with increasing the BRAF content, and thermal property which against the thermal expansion was markdly improved, especially. These results are compared with chopped non-woody fibers as Henequen or Kenaf, BRAF was more effective for fabrication of biocomposites reinforced small-sized fibers. The red algae fiber reinforced biocomposites has the applicability such as electronics, biodegradable products and small-structure composites.

• 한국식품영양학회지
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• 제35권1호
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• pp.43-50
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• 2022

Agar, a heterogeneous polymer of galactose, is the main component of the cell wall of marine red algae. It is well established as a safe, non-digestible carbohydrate in oriental countries. Neoagarooligosaccharides (NAOs) prepared by hydrolyzing agar by microbial β-agarase have been reported to show safety. However, their immunological effects have not been reported yet. Thus, the objective of this study was to investigate immune enhancing effects of neoagarooligosaccharides (NAOs) from marine red algae Gelidium elegans in mice by performing ex vivo experiments. Six-week-old mice were fed ad libitum. NAOs were orally administrated at three different concentrations (100, 500, and 2,500 mg/kg B.W./day) twice a week for four weeks. The group fed with NAOs at 2,500 mg/kg showed the highest proliferation of splenocytes and production levels of cytokines (IL-1β, IL-6, TNF-α) in the ex vivo experiment. In conclusion, NAOs can enhance immune function, increase proliferation of splenocytes, and increase cytokine production by activating macrophages in mice.

• 스마트미디어저널
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• 제7권2호
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• pp.34-39
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• 2018

국내 유해 적조발생에 따른 어패류 양식장에 지속적인 피해가 증가함에 따라서 적조에 대하여 많은 연구가 이루어지고 있다. 그러나 자동으로 적조 이미지를 인식하여서 유해적조생물을 판별하는 적조생물 이미지 검색에 대한 국내의 연구는 미흡한 실정에 있다. 본 논문은 오픈소스 기반의 딥러닝을 이용하여 적조생물 이미지를 분류할 수 있는 방법을 제안한다. 제안방법은 다양하게 표현되는 적조생물 이미지의 인식문제를 해결하기 위하여 텐서프로 프레임워크와 구굴 이미지 분류 모델을 이용하여 구현하였다.

• 한국해양학회지
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• 제10권1호
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• pp.25-32
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• 1975

Continued to the previous paper, the present investigation deals with stronitium-90 activities and calcium contents among 54 samples of edible marine algae collected along the coast of Korea during September, 1973 and April, 1974. The calcium contents are variable 2.0-17.8%, and 6.38% on an average. Most of the members investigated contain 2-4% in green and red algae, and 8-10% in brown algae. Strontium-90 activities are 0.32-0.37 pCi/l in sea-water, and 0.80-28.66 pCi$\^$90/Sr/g Ca in edible seaweeds. Among the algal phyla, they are 12.49 in green, 3.34 in brown, and 9.39 pCi$\^$90/Sr/g Ca in red algae, while they are 6.25 pCi$\^$90/Sr/g Ca on an average. In a single species collected at the same season, the highest activities appear mostly from the eastern coast, and from the western and southern coasts, in turn. The green algae, Capsosiphon- Enteromorpha complex show about 3 times higher activities, 28.66 pCi$\^$90/Sr /g Ca compared with the other members showing rather higher activities, and would be an indicator plant of strontium-90 activities of the marine algae along the coast of Korea.