• Title/Summary/Keyword: 촉진효과

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Effects of Milk Products on Acid Production by Lactic Acid Bacteria in Soy Milk and Quality of Soy Yogurt (두유(豆乳)에 첨가된 유제품이 젖산균의 산생성(酸生成)과 대두요구르트의 품질에 미치는 영향)

  • Ko, Young-Tae
    • Korean Journal of Food Science and Technology
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    • v.22 no.2
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    • pp.183-191
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    • 1990

  • Soy milk prepared from soy protein concentrate was added with each of four types of milk products. Acid production and growth of five species of lactic acid bacteria(LAB) in soy milk and sensory property of soy yogurt were investigated. Acid production by LAB increased in proportion to concentration of milk products added to soy milk. Among the four milk products tested, whey powder or skim milk powder stimulated acid production by LAB more than whole milk powder or modified milk powder. Stimulating effect by whey powder on acid production by LAB was greater than other milk products at low concentration. Acid production by LAB in soy milk added with glucose or milk products significantly increased during fermentation. Sensory property of soy yogurt added with whole milk powder or skim milk powder was better than that of reference (soy yogurt added with glucose) while sensory property of soy yogurt added with whey powder or modified milk powder was Inferior to that of reference.

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Effect of Quercetin on Auxin-induced Ethylene Production in Barley Coleoptiles (Quercetin이 보리 자엽초에서 옥신에 의해 유도되는 에틸렌 생성에 미치는 영향)

  • 이준승
    • Journal of Plant Biology
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    • v.35 no.4
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    • pp.409-414
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    • 1992

  • Effect of quercetin, a kind of natural plant flavonoids, on auxin-induced ethylene production in barley coleoptiles was studied. Auxin-induced ethylene production was apparently stimulated by quercetin. This stimulatory effect of quercetin appeared after 4 h of incubation period. Ethylene production was stimulated 200% over the control after 8 h of incubation by $3{\times}10^{-5}\;M$ quercetin. The quercetin effect was most prominent at $10^{-4}\;M$ of IAA. Ethylene production induced by the synthetic auxin, 2,4-D and NAA, was not significantly affected by quercetin. Also ACC-based ethylene production was unaffected by the flavonoid. In an effort to elucidate mechanisms of quercetin action on auxin-induced ethylene production, the effect of quercetin on 1M metabolism was studied. Data obtained from these experiments indicate that quercetin treatment resulted in about 90% inhibition of IAA oxidase activity. IAA ($3{\times}10^{-5}\;M$) conjugation was found to be not affected by quercetin. This results suggest that the stimulatory effect of quercetin on auxin-induced ethylene production may be due to the fact that quercetin inhibits 1M oxidase activity, thus increasing the free IAA level.

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Plant Growth Promoting Fungi Isolated from Rhizosphere of Zoysiagrass in Korea (잔디 근권에서 분리한 식물생장촉진 균류)

  • Park, Myung-Soo;Yu, Seung-Hun
    • The Korean Journal of Mycology
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    • v.33 no.1
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    • pp.30-34
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    • 2005

  • Fifteen PGPF (plant growth promoting fungi) isolates were selected from 728 fungal isolates collected from rhizosphere of zoysiagrass in Korea. Identification of the 15 isolates was based on their morphological characteristics. They were classified as Gliocladium sp. (n=1), Penicillium sp. (n=5), Trichoderma sp. (n=3), Fusarium sp. (n=3), and unidentifed species (n=3). Of the 15 isolates, six (PF-31, PF-136, PF-238, PF-255, PF-395, PF-420) significantly promoted the growth of tomato seedlings, and three (PF-31, PF-101, PF-255) also promoted the growth of hot pepper and two (PF-31, PF-225) also promoted the growth of cucumber, The 15 PGPF isolates were divided into 4 groups based on root colonizing ability. Isolates PF-17, PF-101 and PF-225 were included in the group 1, which had high root colonizing ability.

  • https://doi.org/10.4489/KJM.2005.33.1.030 인용 PDF KSCI