This study was conducted to assess the possibility of 5,8-dihydroxy-1,4-naphthoquinone (DHNQ) as a environmental friendly herbicide candidate. Foliar application of DHNQ showed excellent herbicidal effect to the 3 grasses and 5 broad-leaved weeds. Among them, Digitaria sanguinalis and Solanum nigrum were completely controlled by $250{\mu}g\;mL^{-1}$ of DHNQ with main symptoms of desiccation or burndown within 24 hours. Aeschynomene indica was also sensitive to DHNQ treatment. All of the eight weed species were controlled by 90~100% at a concentration of $1000{\mu}g\;mL^{-1}$. However, soil application of DHNQ to Digitaria sanguinalis did not show any herbicidal symptoms. DHNQ strongly inhibited KAPAS activities in vitro and the $IC_{50}$ was $4.4{\mu}M$. Cellular leakage from cucumber leaf squares treated with DHNQ increased depending on the concentrations increased from 6.25 to $100{\mu}M$ after 24 hours incubation with or without light. However, chlorophyll loss in cucumber leaf squares was negligible. Biotin supplements significantly rescued the inhibition of germination rate of Arabidopsis thaliana seeds previously inhibited by the DHNQ. According to above results, DHNQ is a good natural herbicide candidate having a new target KAPAS, which is involved in biotin biosynthesis pathway, with environmental friendly.
Park, Jong-Woo;Kim, Young-Geel;Heo, Woo-Myung;Kim, Bom-Chul;Yih, Won-Ho
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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v.11
no.4
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pp.158-164
/
2006
Yongdam Lake is the fifth largest artificial lake in Korea newly formed by the first impounding the Yongdam Multi-purpose Dam on December, 2002. Yongdam Lake, with her total water storage of 820 million M/T, is located at the roof-top region of the streams flowing into the just-constructed new Saemankeum Lake. Seasonal succession of phytoplakton in Yongdam Lake might affect cyanobacterial blooms in Saemankeum Lake by inoculating seasonal dominants. During 2002-2003 when the first impounding after the construction of Yongdam Multi-purpose Dam was still undergoing, summer cyanobacterial blooms by Anabaena, Microcystis, and Aphanizomenon were observed. Among these three, filamentous Anabaena is well known to have its species with $N_2-fixing$ ability and special cells such as heterocysts and akinetes as well as the vegetative cells. We established a clonal culture of Anabaena spiroides v. crasse (KNU-YD0310) from the live water samples collected at the bloom site of Yongdam Lake. The N- and P-nutrient requirement of the KNU-YD0310 was explored by the experimental cultivation of the laboratory strain. Ratio of heterocysts to vegetative cells increased as N-deficiency extended with its maximum at $N_2-fixing$ condition. The strain KNU-YD0310 exhibited considerable growth under N-limiting conditions while its growth was proportional to the initial phosphate-P concentration under P-deficient conditions. Under P-limiting conditions akinete density increased, which could be interpreted as an adaptation strategy to survive severe environment by transforming into resting stage. The above eco-physiological characteristics of Anabaena spiroides v. crassa might be useful as an ecological criterion in controlling cyanobacterial blooms at Shaemankeum Lake in near future.
Jung, Jeong Sung;Choi, Ki Choon;Kim, Won Ho;Choi, Gi Jun
Journal of The Korean Society of Grassland and Forage Science
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v.40
no.1
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pp.7-14
/
2020
This study was conducted to find out the effects of seed mixture using new domestic grass varieties orchardgrass 'Onnuri' and tall fescue 'Greenmaster' on botanical composition and dry matter productivity from 2015 to 2018 in oversown hilly pasture, the central northern area of Korea. This experiment was consisted of 4 mixed grasses (Treatment 1 : tall fescue oriented mixture with imported varieties; Treatment 2 : orchardgrass oriented mixture with imported varieties; Treatment 3 : orchardgrass oriented mixture with domestic varieties, Treatment 4 : tall fescue oriented mixture with domestic varieties). Evaluation of seasonal changes in botanical composition of pasture showed that orchardgrass was the highest in all treatments, ranging from 46 to 89% and Kentucky bluegrass was the second highest in all treatments. Treatment 3 (7,633 kg ha-1) and Treatment 4 (7,570 kg ha-1), mixed grasses using domestic varieties, were showed the highest dry matter yield than Treatment 1(6,950 kg ha-1) and Treatment 2 (6,934 kg ha-1), which were mixed grasses using introduced varieties. Therefore, these results showed that the orchard grass oriented grasses mixture with domestic varieties was good for grassland vegetation and productivity in oversown hilly pasture, the central northern area of Korea.
The formation of reactive lipid aldehydes, 4-hydroxynonenal (HNE) is shown to be derived from fatty acid hydroperoxides through the oxidative process. Among its known effects in cytotoxicity, HNE has been implicated in apoptotic cell death. To delineate its putative role as a potential mediator, we investigated the mechanism by which HNE induces apoptosis of endothelial cells (ECs). The anti-proliferative effects of HNE were tested through MTT assay after exposure to various concentrations ($5\sim15\;{\mu}M$) of HNE. We observed apoptotic bodies with propidium iodide staining, and measured the HNE induction of endothelial apoptosis by flow cytometry assay. We observed that cells exposed to HNE for 24 hr resulted in increased poly(ADP-ribose) polymerase cleavage and up-regulation of Bax. Data on the HNE action strongly indicated the involvement of reactive species, namely, intracellular ROS, nitrite, and peroxynitrite. To obtain evidence on the implication of ROS and peroxynitrite in HNE-induced apoptosis, a ROS scavenger, N-acetylcysteine (NAC), and a peroxynitrite scavenger, penicillamine, were tested. Results clearly indicate that the induction of apoptosis by HNE was effectively inhibited by NAC and penicillamine. Based on the present data, we conclude that the endothelial apoptosis induced by HNE involves both ROS generation and peroxynitrite activity. Our new data could lead to a redefinition of HNE action on apoptosis in ECs.
As a preliminary study in order to develop new varieties of Hericium species, this study was carried out to investigate the optimal temperature for mycelial growth, to figure out the applicability to sawdust cultivation on Quercus mongolica substrate, and to analyze the antioxidant capacity of ergothioneine and polyphenols in Hericium strains preserved in Korea Forest Research Institute (KFRI). In the results of optimal temperature for mycelial growth of eight Hericium erinaceus, it was $20^{\circ}C$ in a strain (KFRI 842), $25^{\circ}C$ in five strains (KFRI 507, 508, 509, 843, 845), and $30^{\circ}C$ in two strains (KFRI 582, 844). Optimal temperature for mycelial growth of H. coralloides (KFRI 713) was $25^{\circ}C$. Four strains (KFRI 508, 843, 844, 713) out of the total nine Hericium strains showed full mycelium growth within 20 days at the optimal temperature on PDA medium in petri-dish (85 mm in diameter). The other strains have need of more time for full mycelium growth. Mushroom production of H. erinaceus ranged from 215 to 384 g of fresh weight and its dry weight was 7 to 9% of it, whereas that of H. coralloides was 299 g of fresh weight and its dry weight was 10% of it. The contents of ergothioneine and polyphenols of H. erinaceus strains were different by strains and those were in the range of $1.6{\sim}3.7$ mg/g dw. and $5.9{\sim}7.8$ mg/g dw., respectively. On the other hand, those of H. coraloides were in the range of 1.7 mg/g dw. and 3.9 mg/g dw., respectively. From the results of correlation ($R^2$ = 0.1) between ergothioneine and polyphenols in the strains, it was found that the total contents of them differ by strains but the ratio of the two compounds was not very different in the strains.
This study was conducted to establish the method for preserving PGCs that enables long-term storage in liquid nitrogen for developmental engineering or preservation of species. The purpose of this study is to clarify the effects of freeze-thaw treatment on viability of PGCs in chickens. PGCs were collected separately from a germinal gonad of an early embryo of 5.5~6 day (stage 28) of Isa brown, Korean Oge (KO), White Leghorn and Commercial breeds. PGCs separated from a germinal gonad of an early embryo of 5.5~6 day (stage 28) are suspended in a freezing medium containing a freezing and protecting agents (e.g. dimethyl sulfoxide (DMSO), ethylene glycol (EG) and glycerol). The PGCs were then purified using magnetic activated cell sorting (MACS) method. The viability of PGCs after thawing was $87.4{\pm}0.4%$ and $89.4{\pm}0.2%$ with the 10% EG treatments with no significant difference between the Isa brown and Commercial breeds. The viability of PGCs after freeze- thawing was significantly higher for Isa brown ($87.4{\pm}0.4%$) and Commercial breeds ($89.4{\pm}0.2%$) than Korean Oge (KO) ($77.6{\pm}1.1%$) and White Leghorn ($76.2{\pm}0.9%$)(p<0.05) using 10% EG cryoprotectant. This study established a method for pre- serving chicken PGCs that enables systematic storage and labeling of cryopreserved PGCs in liquid ($LN_2$) at agermplasm repository and ease of entry into a data base. In the future, the importance for this new technology is that poultry lines can be conserved while work is being conducted on improving the production of germline chimeras.
Journal of the Society of Cosmetic Scientists of Korea
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v.37
no.3
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pp.257-264
/
2011
In this study, to evaluate the antioxidative activities and anti-inflammatory effects of kaempferol and its rhamnosides, we performed the free radical scavenging assay, ROS inhibition assay and TARC (thymus and activation-regulated chemokine) assay. Also, we studied physiological activity of kaempferol and its rhamnosides (${\alpha}$-rhamnoisorobin, afzelin, kaempferitn) by structure-activity relations. The free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activities were determined with kaempferol (62.5 ${\mu}M$) and ${\alpha}$-rhamnoisorobin (50.0 ${\mu}M$) but afzelin and kaempferitrin did not show free radical scavenging activities. Kaempferol showed a 97.5, 57.8, 47.8 % inhibition of ROS (reactive oxygen species) generated at concentrations of 10, 50 and 100 ${\mu}M$, compared to control (100 %). ${\alpha}$-rhamnoisorobin showed a 93.1, 59.1 and 41.4 % inhibition of ROS at the same concentration. We investigated the inhibitory effects of kaempferol and its rhamnosides on TARC expression. Kaempferol showed a 48.8, 5.5 and 4.4 % inhibition of TARC generated at 10, 50 and 100 ${\mu}M$, compared to control. ${\alpha}$-Rhamnoisorobin showed a 88.1, 19.0 and 1.0 % inhibition of TARC generated at the same concentration. In conclusion, these results indicate that kaempferol and ${\alpha}$-rhamnoisorobin have good antioxidative activities and anti-inflammatory effects that could be applicable to new functional cosmetics for anti-aging and anti-inflammation.
The purpose of this study was to develop a new fermented product (named as Cheonggeumjang) using Sigumjang, Cheonggukjang and Oak mushroom. This study was conducted to evaluate the effects of Sigumjang, Cheonggukjang, and Cheonggeumjang, which were mixed in a different ratio as A (Sigumjang: Cheonggukjang = 1:2), B (Sigumjang: Cheonggukjang = 1:1) and C (Sigumjang: Cheonggukjang = 2 : 1). Then, the functions and physicochemical properties of products were investigated. We found that the crude protein content in Cheonggeumjang was higher than in Sigumjang whereas fat and calories content was less than that of Cheonggukjang. Free sugar content in Cheonggeumjang C 5.8681 g/100g was the highest. Moroever, Cheonggeumjang C and Sigumjang has an antioxidant activities. The electron donating capacity, SOD like activity and the inhibitory effect on xanthine oxidase of these two were significantly high than other group. Fat rancidity is promoted in the presence of metal ion, Cheonggeumjang group has higher inhibitory effect on $Fe^{2+}$ion than on $Cu^{2+}$ ion. The rancidity of fat is also increased by reactive oxygens species, Cheonggeumjang group inhibited $H_2O_2$ in higher extent than $KO_2$. Also, ${\alpha}$-glucosidase inhibition activity of Cheonggeumjang C in all of the concentrations (300 ppm, 500 ppm and 700 ppm) is higher than other groups. In sensory evaluation, Cheonggeumjang C groups is ranked significantly higher than the other groups while considering color, flavor, taste and the overall acceptability. Taken together, the results of this study suggest that Cheonggeumjang is best ingredient for increasing the consumer acceptability and functionality.
Journal of the Society of Cosmetic Scientists of Korea
/
v.34
no.2
/
pp.83-92
/
2008
In this study, the antioxidative effects, inhibitory effects on tyrosinase and elastase and components of Fagopyrum esculetum extracts were investigated. Fagopyrum esculetum used for this study is hulls and dehulled seeds. The free radical(1,1-diphenyl-2-picrylhydrazyl radical, DPPH) scavenging activities($FSC_{50}$) and reactive oxygen species(ROS) scavenging activities($OSC_{50}$) of extract/fractions from Fagopyrum esculetum were measured. The aglycone($3.5{\pm}0.0{\mu}g/mL$) and ethyl acetate fractions($0.2{\pm}0.1{\mu}g/mL$) of hulls showed the most effective scavenging activities. The protective effects on the rose-bengal sensitized photohemolysis of human erythrocytes were investigated. The ethyl acetate fraction exhibited the most prominent cellular protective effect(${\tau}_{50},\;771.7{\pm}9.9 min$ at 10 ${\mu}g/mL$). The inhibitory effect of aglycone fraction of hull and dehulled seeds on tyrosinase were examined ($53.6{\pm}0.5{\mu}g/mL,\;35.6{\pm}0.4{\mu}g/mL$, respectively). And The inhibitory effect of aglycone fraction of hull and dehulled seeds on elastase were investigated($3.7{\pm}0.4{\mu}g/mL\;and\;6.0{\pm}0.7{\mu}g/mL$ respectively). But 50% ethanol extract rarely exhibited the inhibitory activity on tyrosinase and elastase. (+)-Catechin and (-)-epicatechin were contained in ethyl acetate fraction of dehulled seeds. And ethyl acetate fraction of hull contains flavonoids of hyperin, quercetin, rutin and so on. These results indicate that extract/fractions of Fagopyrum esculentum can function as antioxidants in biological systems, particularly skin exposed to UV radiation by scavenging $^1O_2$ and other ROS, and protect cellular membranes against ROS. Fagopyrum esculentum extract could be used as a new cosmeceutical for whitening and anti-wrinkle products.
Journal of the Society of Cosmetic Scientists of Korea
/
v.37
no.2
/
pp.143-152
/
2011
In this study, the antioxidative activity, inhibitory effects on tyrosinase and elastase, and active components of Quercus salicina Blume extracts were investigated. Q. salicina Blume was extracted using 50 % ethanol, from which ethyl acetate and aglycone fractions were prepared. The DPPH (1,1-diphenyl-2-picrylhydrazyl) scavenging activity ($FSC_{50}$) of Q. salicina Blume aglycone fraction was the highest ($8.25\;{\mu}g$/mL). The luminol-dependent chemiluminescence assay showed that reactive oxygen species (ROS) scavenging activities ($OSC_{50}$) of Q. salicina Blume aglycone fraction on ROS generated in $Fe^{3+}-EDTA/H_2O_2$ system was the most prominent at $0.039\;{\mu}g$/mL. The protective effects of extract/fractions of Q. salicina Blume against the rose-bengal sensitized photohemolysis of human erythrocytes were increased in a concentration dependent manner ($1{\sim} 25\;{\mu}g$/mL). Especially, ${\tau}_{50}$ of aglycone fraction in $10 \;{\mu}g$/mL concentration showed the most protective effect at 259.9 min. The inhibitory effects ($IC_{50}$) on tyrosinase and elastase of Q. salicina Blume extracts were higher at aglycone fraction (respectively, $21.82 \;{\mu}g$/mL, $41.18\;{\mu}g$/mL). Active component analysis by TLC and HPLC showed quercetin, keampferol, catechin, quercitrin, isoquercitrin, hyperoside, and etc. These results indicate that Q. salicina Blume extract has strong antioxidative activity and can be used as antioxidant. Particularly, aglycone fraction of Q. salicina Blume showed superior antioxdative activity and high inhibitory effect on tyrosinase and elastase. Therefore, aglycone fraction of Q. salicina Blume could be applicable to new functional cosmetics.
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