• 한국수산과학회지
• /
• 제1권2호
• /
• pp.121-127
• /
• 1968

This research has been dealt with the nutritional component analysis of two kinds of non-edible marine algae, Sargassum herneri (Turner) C. Ag. and Zostera marina Linne which grow abundantly around the southern coast of Korea, These marine algae were mixed in several kinds of samples rates with the combined feed for poultry sold in the market. These were given to 35 chicken in seven test divisions respectively. We have experimented with 35 chicken grown up for two weeks after hatchout. The combined food for poultry obtained from the market was set up as control divisions. The experiments were as follows: 1) The average weight increase in each test division during feeding (Table 5, Fig.2). 2) Food conversion rate and food efficiency in each test division (Table 7). 3) The comparison of digestive rate of crude protein during feeding (Table 8), The results were as follows: 1) The weight increasing rate of the test animal stock fed the food containing $5\~10\%$ of Sargassum horneri (Turner) C. Ag. powder was higher than the rate of those fed only market food for poultry. 2) The stock given food containing $10\%$ Zostera marine powder showed lower growth than the control divison. 3) No apparent trouble owing to salt component involved in the marine algae was found. 4) The stock given food containing sodium glutaminate and Sargassum horneri (Turner) C. Ag. had better result than that without sodium glutaminate.

• 한국식품과학회지
• /
• 제36권1호
• /
• pp.69-74
• /
• 2004

해조분말을 이용하여 산 알칼리 병용법으로 알긴산을 추출하고 필름의 물성 증진을 위하여 두 가지의 $CaCl_{2}$ 처리방법 (즉, $CaCl_{2}$를 필름용액에 직접 첨가하는 방법과 필름을 제조한 후 필름을 $CaCl_{2}$, 용액에 침지하여 가교결합을 유도하는 방법)을 적용하여 생분해성 필름을 제조하고 그 물성을 비교하였다. 사용된 해조분말(미역 잎, 미역줄기, 미역귀, 다시마, 톳)중 톳을 제외하고는 모두 필름이 제조되었다. 이들 해조 필름의 물성에 대한 $CaCl_{2}$ 처리방법의 영향은 수분용해도 외에는 큰 차이를 나타내지 않았다. 비록 이들 해조필름의 인장강도, 투습도, 수분용해도와 같은 필름의 물성이 순수한 알긴산으로 제조한 필름의 물성에 비해 떨어지나 본 연구의 결과는 미이용 해조분말이나 해조가공 부산물로 얻어지는 해조분말을 이용하여 새로운 생분해성 포장소재로 사용할 수 있는 가능성이 있음을 나타냈다.

• 수산해양교육연구
• /
• 제21권1호
• /
• pp.28-42
• /
• 2009

For the utilization of seaweed (Capsosiphon fulvecense, algae) powder as an ingredient of bread, the quality of bread made with different concentration of seaweed powder was evaluated with physical and sensory properties. The powdered algae was shown to have crude protein content at 25.38%. The major minerals were identified with calcium with 8.38 g/kg, potassium with 9.5 g/kg, and magnesium with 5.6 g/kg, which comprised to 19.08% of total mineral content. Amount of essential amino acids content was estimated to be 835 mg/100 g. Content of essential fatty acid was found to be 27,25% of total fatty acids. For the preparation of bread added with seaweed powder, the addition ratio of seaweed was set at 3, 5 and 7% versus wheat flour with same ratio of other ingredients. L value, lightness of bread, was proportionally reduced with increse of seaweed powder. However, b value, yellowness, was increased with the addition of the seaweed powder. Adhesiveness, cohesiveness, and springiness of the bread were reduced with the addition of the seaweed powder, however, hardness of the bread was vice versa. Texture, flavor, color, and overall acceptance of the bread added seaweed powder were shown up significant differences among all tested groups (P < 0.001), that is, more seaweed powder showed less favorable texture, flavor, color, and overall acceptance. Although the bread added with seaweed powder showed a less preference compared to control group, the bread with 3% of seaweed powder was favorable to other test groups, which might have a potential for the commercialization of functional breads using seaweeds.

• ALGAE
• /
• 제39권1호
• /
• pp.31-41
• /
• 2024

Acadian marine plant extract powder (AMPEP) and Kelpak are commercial biostimulants derived from brown algae Ascophyllum nodosum. This study was to determine if AMPEP and Kelpak can induce thermal resistance in Pyropia yezoensis. P. yezoensis blades were exposed to different concentrations (control: 0, low: 0.001, high: 1 ppm) of AMPEP and Kelpak at 10℃ for 6 and 7 days, respectively. Those blades were then cultivated in von Stosch enriched seawater medium at different temperatures (10, 15, 20, and 25℃) with 12 : 12 L : D photoperiod and 100 µmol m^-2 s^-1 of photosynthetically active radiation for additional 15 days. Results showed that P. yezoensisreproduced archeospores at 20 and 25℃ at all biostimulant conditions within 15 days. At lower temperatures (10 and 15℃), only AMPEP-treated P. yezoensis reproduced archeospores. P. yezoensis exposed to 1 ppm Kelpak exhibited higher phycoerythrin and phycocyanin contents than control and 0.001 ppm conditions at 15℃. AMPEP-treated conditions showed higher phycoerythrin and phycocyanin contents than control at 10℃. These results suggest that AMPEP and Kelpak may not enhance the thermal resistance of P. yezoensis. However, AMPEP stimulated archeospores release at lower temperatures. The treatment of AMPEP and Kelpak also increased the pigment contents in P. yezoensis. These results suggest that the use of seaweed-derived biostimulants can provide some economic benefits in P. yezoensis aquaculture. The enhancement of archeospores formation by AMPEP at lower temperature may also increase the productivity since Pyropia farming relies on the accumulation of secondary seedings via asexual reproduction.

• Environmental Engineering Research
• /
• 제25권2호
• /
• pp.230-237
• /
• 2020

Nitrogen flux release from organically enriched sediments into overlying water, which may have significantly influence on water quality and increasing continuous eutrophication. The purpose of this study is to evaluate the remediation efficiency of oyster shell powder and its treated product into organically enriched sediment in terms of nitrogen flux, organic matter, chlorophyll-a, pH and dissolved oxygen (DO). The TOSP was mainly composed of CaO2. The application of TOSP into the sediment has increased the pH, DO and significantly decreased the concentrations of NH₄⁺-N and T-N compared to other basins. On the other hand, nitrate was enriched with the addition of treated oyster powder, an oxygen releasing compound on both phases. Furthermore, chlorophyll-a was found to be increasing with time in the control basin meanwhile it dropped drastically with the addition of TOSP, which implied on the repression of algal growth owing to blockage of nitrogen source migrating from the sediment. This study has shown that the TOSP was effective to improve sediment-water quality, diminish eutrophication and control harmful algae blooms in a marine environment. Therefore, it is a good reference as an effective environmental remediation agent.

• 한국환경과학회지
• /
• 제28권10호
• /
• pp.851-861
• /
• 2019

In this study, we performed a sediment elution experiment to evaluate water quality in terms of phosphorus, as influenced by the dissolved oxygen consumed by sediments. Three separate model column treatments, namely, raw, calcined, and sonicated oyster shell powders, were used in this experiment. Essential phosphorus fractions were examined to verify their roles in nutrient release from sediment based on correlation analyses. When treated with calcined or sonicated oyster shell powder, the sediment-water interface became "less anaerobic," thereby producing conditions conducive to partial oxidation and activities of aerobic bacteria. Sediment Oxygen Demand (SOD) was found to be closely correlated with the growth of algae, which confirmed an intermittent input of organic biomass at the sediment surface. SOD was positively correlated with exchangeable and loosely adsorbed phosphorus and organic phosphorus, owing to the accumulation of unbound algal biomass-derived phosphates in sediment, whereas it was negatively correlated with ferric iron-bound phosphorus or calcium fluorapatite-bound phosphorus, which were present in the form of "insoluble" complexes, thereby facilitating the free migration of sulfate-reducing bacteria or limiting the release from complexes, depending on applied local conditions. PCR-denaturing gradient gel electrophoresis revealed that iron-reducing bacteria were the dominant species in control and non-calcined oyster shell columns, whereas certain sulfur-oxidizing bacteria were identified in the column treated with calcined oyster powder.

• ALGAE
• /
• 제32권1호
• /
• pp.67-74
• /
• 2017

The heterotrophic dinoflagellate Oxyrrhis marina is known to produce high levels of docosahexaenoic acid (DHA) when fed on diverse algal prey. However, large-scale culturing of algal prey species is not easy and requires a large amount of budget, and thus more easily cultivable and low-cost prey is required. Dried yeast was selected as a strong candidate for an alternative prey in our preliminary tests. Thus, we explored the fatty acid composition and DHA production of O. marina fed on dried yeast and compared these results to those of O. marina fed on two algal prey species: the phototrophic dinoflagellate Amphidinium carterae and chlorophyte Chlorella sp. powder. O. marina fed on dried yeast, which does not contain DHA, produced the same high level of DHA as those fed on DHA-containing A. carterae. This indicates that O. marina is likely to produce DHA by itself regardless of prey items. Furthermore, the DHA content (and portion of total fatty acid methyl esters) of O. marina satiated with dried yeast, 52.40 pg per cell(and 25.9%), was considerably greater than that of O. marina fed on A. carterae (26.91 pg per cell; 15.7%) or powder of Chlorella sp. powder (21.24 pg per cell; 16.7%). The cost of dried yeast (approximately 10 US dollars for 1 kg dried yeast) was much lower than that of obtaining the algal prey (approximately 160 US dollars for 1 kg A. carterae). Therefore, compared to conventional algal prey, dried yeast is a more easily obtainable and lower-cost prey for use in the production of DHA by O. marina.

• 한국해양학회지:바다
• /
• 제5권3호
• /
• pp.233-237
• /
• 2000

Harpacticoida 목, Diosaccidae 과에 속하는 Paramphiascella vararensis를 실험실내에서 배양하여 nauplius 단계의 유생 발생을 기술, 도시하였다. P. vararensis는 부화 후 VI단계의 nauplius 유생기가 관찰되었으며, 제 VI nauplius 단계 이후에는 copepodid로 탈피하였다. 22${\sim}$23$^{\circ}$C의 배양 온도, 33${\sim}$34ppt의 염분 농도 그리고 구멍 갈파래의 분말을 먹이로 급이하면서 사육한 결과, 부화 후 nauplius VI 단계까지 12일이 소요되었다. nauplius 유생의 형태는 납작하고 체장의 길이보다 체폭의 길이가 긴 타원형이며, 전방에 하나의 붉은색 안점을 가지고 있었으며, 크기의 범위는 35${\sim}$98${\mu}$m였다. 그리고 제 2촉각의 저절과 기절의 강모식에 의해 제 I nauplius 유생기에서 제 IV nauplius 유생기까지 발생 단계의 식별이 가능하며, 제 V nauplius 유생기와 제 VI nauplius 유생기는 제 2소악과 미부의 강모식에 의해 식별이 가능하였다. P. vararensis의 nauplius 유생기에서 제 1소악의 원기는 제 III nauplius 유생기에서 관찰되었으며,제 2소악의 원기는 제 V nauplius 유생기에서 관찰되었다.

• 한국해양학회지:바다
• /
• 제5권3호
• /
• pp.238-244
• /
• 2000

이 연구에서는 갑각강, 요각아강, Harpacticoida 목, Diosaccidae과, Paramphiascella 속의 Paramphiascella vararensis의 copepodid유생단계 및 성체의 발생과정에 대하여 보고한다. P. vararensis는 구멍 갈파래의 건조 분말을 먹이로 수온 22${\sim}$23$^{\circ}$C, 염분 33${\sim}$34 ppt의 배양 조건하에서 copepodid I 단계에서 copepodid VI 단계인 성체까지 발생하는데, 15일이 소요되었다. 성 분화는 제 IV copepodid기에서 이루어지며, 크기, 제 1 촉각, 제 2 흉지, 제 5 흉지 및 제 6 흉지 등에서 발생을 거듭하면서 형태적 차이를 보였다. 즉, 크기에서는 숫컷이 암컷보다 훨씬 작으며, 제 1 촉각은 암컷에 비하여 숫컷이 매우 변형되었고, 특히 제 1 촉각의 네 번째 마디가 암컷에 비해 매우 부풀어져있었다. 그리고 암컷의 제 2 흉지의 내지는 3마디이나, 숫컷은 2마디로 차이를 보였다. 한편, 제 5 흉지의 내엽의 강모수는 암컷이 3개, 숫컷이 2개였고, 제 6 흉지에서는 암컷은 2개, 숫컷은 3개의 강모를 갖는다.

• 한국축산식품학회지
• /
• 제37권3호
• /
• pp.456-463
• /
• 2017

The aim of this study was to identify the optimal and superior type of natural calcium for replacing phosphate in cooked ground pork products. To achieve this, 0.5% eggshell calcium (ESC), oyster shell calcium (OSC), marine algae calcium (MAC), or milk calcium (MC) was added to ground pork meat products. The effect of this substitution was studied by comparing the substituted products with products containing 0.3% phosphate blend (control). ESC was considered an ideal phosphate replacer for minimizing the cooking loss, which likely resulted from the increase in the pH of the product. Among the other natural calcium types, OSC treatment did not cause a significant increase in pH, but it lowered the cooking loss. CIE $L^*$ values were higher (p<0.05) in products treated with OSC or MC than the control, and lowest (p<0.05) in the products with ESC. However, products with ESC had higher (p<0.05) CIE $a^*$ and CIE $b^*$ values than the control and products treated with other powders. Compared to the control, products treated with ESC and OSC had similar substitution effects on the textural properties of the products. Therefore, the results of this study suggested that the combined use of ESC and OSC could be a potentially effective method for replacing synthetic phosphate in ground pork products.