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• W2359867263 abstract "Antarctic is an extreme cold area with high salinity and strong UV irradiation. Antarctic ice microalga, the main producer of primary production, play a very important role in marine ecology system. Ice microalga develop many mechanisms to adapt these extreme environments after a long time evolution. In order to use completely the value of ice microalga, the effects of culture conditions (medium, temperature, irradiance, salinity, pH and nutrient sources) on two species of antarctic green microalga were investigated. Pyramidomonas sp. and Chlorophyceae L-4 were cultured in f/2 medium. The OD_(440), chlorophyll content and specific growth rate were determined every two days. The results showed that f/2 medium was the favorable one for Pyramidomonas sp. and Chlorophyceae L-4 among f/2, Provasoli and green algae medium. These two species of alga were developed under 4 different temperature of -3, 2, 6 and 10 ℃, the range of optimum temperature for the growth of Pyramdoimonas sp. and Chlorophyceae L-4 is 2-6 ℃ and -3-6 ℃ respectively. After the irradiance of 0.6, 3.0, 7.0, 20.0 and 60.0 μE·m~(-2)·s~(-1), the maximal growth quantity of Pyramidomonas sp. and Chlorophyceae L-4 were both got under 7.0-60.0 μE·m~(-2)·s~(-1). The salinity of f/2 medium were adjusted to 11, 22, 33, 66, 100 and 150 by adding crude salt and sterile water, and the results showed 22-33 was optimum. The pH value of f/2 medium to 6.0, 7.0, 8.0, 9.0 and 10.0 with 0.1 mol·L~(-1) HCl and NaOH were regulated, the optimum pH value for the growth of Pyramidomonas sp. was 9.0, while Chlorophyceae L-4 was 8.0-8.5. In all nitrogen sources (NaNO_3, NH_4Cl and urea), NaNO_3 was optimum for the two species of alga. Pyramidomonas sp. and Chlorophyceae L-4 were cultured in different NaNO_3 level of 0, 0.56, 0.88, 1.18 and 1.47 mol·L~(-1), and our experiments showed that the optimum concentration for Pyramidomonas sp. is 0.88 mmol·L~(-1), and 0.56-1.47 mmol·L~(-1) has no obvious effect on Chlorophyceae L-4. These two species of green microalga were cultured in f/2 medium consisting of KH_2PO_4 (phosphate source) of 0.015, 0.033, 0.065 and 0.13 mol·L~(-1), and the optimum KH_2PO_4 concentration for their growth was both 0.13 mmol·L~(-1). Antarctic ice microalga under the extreme environment have many important substances, such as antioxidant, antifungal, antitumour, etc.. The optimum culture conditions were founded after our experiments, which can provide basic evidences for ice microalga exploitation and large-scale culture." @default.
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• W2359867263 date "2004-01-01" @default.
• W2359867263 modified "2023-09-24" @default.
• W2359867263 title "Optimum culture of antarctic ice microalgae Pyramidomonas sp. and Chlorophyceae L-4" @default.
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