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Effect of Seaweed Extracts on the Viability of the Crustose Coralline Lithophyllum yessoense
강세은,홍용기,안동현,박선미,최재석,김영대 한국수산과학회 2005 Fisheries and Aquatic Sciences Vol.8 No.4
The addition of seaweed extracts was found to regulate the viability of cultures of the crustose coralline alga Lithophyllum yessoense. The viability was quantitated using a triphenyltetrazolium chloride assay, and the methanol-soluble extracts from 18 prevalent seaweed species were tested. Extracts from Codium fragile and Enteromorpha linza inhibited viability, and a Hizikia fusiformis extract slightly increased viability. The methanol extract of C. fragile, which had the strongest inhibitory activity, decreased viability to 72 or 52% that of the control following addition of 0.2 or 2 mg/mL of extract to the culture, respectively. The main active compound in the C. fragile was lipid. This information is a preliminary result related to the exploration of seaweed restoration in the algal whitening area.
A Simple Screening Method for Anti-attachment Compounds Using Monospores of Porphyra yezoensis Ueda
최재석,신현웅,홍용기,강세은,조지영 한국수산과학회 2005 Fisheries and Aquatic Sciences Vol.8 No.2
We measured the anti-attachment activity of allelochemical and antifouling substances using monospores from Porphyra yezoensis Ueda as an assay. Methanol or aqueous extracts (20 g/mL) from 32 seaweeds were added to monospore suspensions. Methanol extracts of Corallina pilulifera, Ishige sinicola, Sargassum horneri, and Sargassum sagamianum inhibited attachment by >90% compared to the reference. Phenolic compounds fractionated from S. sagamianum caused the most potent inhibition. P. yezoensis monospores also showed significant sensitivity to known allelochemical and algicidal compounds.
해조류 방사무늬김 (Porphyra yezoensis) 엽체로부터 산 유도 유전자의 분리
Long-Guo Jin,박선미,박중연,홍용기,진덕희,강세은,최재석 한국수산과학회 2004 한국수산과학회지 Vol.37 No.4
Genetic responses of the edible seaweed Porphyra yezoensis tissue to acid shock have been compared using differential display technique. The tissue was challenged in seawater containing 0.05% hydrogen chloride (pH 3.0) for 5min, then rehabilitated in normal seawater for 10min, 30min, 60min and 4hrs. Total RNA extracted by the LiCl-guanidium method was reverse transcribed and amplified by PCR with arbitrary primers. The amplified fragment responded by the acid shock was selectively isolated from agarose gel and sequenced with DNA auto sequencer. Sequence (1056bp) of the cDNA contained at least two genes for ASP7K (MW 7418) and ASP5K (MW 5512) proteins.