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Anti-melanogenesis effect of 2,5-dimethyM-hydroxy-3 [2H]- furanone
( Che-ok Jeon ),( Ji-yeon Ohf ),( Jae-sook Koh ),( Sung-won Jung ),( Jung-yeon Kim ) 대한화장품학회 1996 대한화장품학회지 Vol.22 No.2
DMHF (2.5-dimethyl-4-hydroxy-3[2H]-furanone), an antioxidative compound from the reaction of L-cysteine/D-glucose scavenged efficiently 1,1-diphenyl-2-picryl hydrazyl free radicals. It exhibited an inhibitory effect on the autoxidation of linolenic acid, and the protective effect against UV cytotoxicity in cultured human fibroblast. In addition, DMHF appeared to prevent the cellular melanogenesis in the cultured murine melanoma cells more effectively than kojic acid, a well known inhibitor of melanogenesis, while the former was not so effective as the latter for the inhibition of the tyrosinase. Considering that cellular melanogenesis is a metabolic process triggered by oxidative stress, it ovas tentatively deduced that the antioxidative property of DMHF might afford the effect against cellular pigmentation by alleviating the causative stress. In toxicological tests such as irritation and sensitization, this compound turned out to be safe. The results of this study suggest that DMHF may be a novel inhibitor of melanogenesis, and that might be useful for application in cosmetics.
Jeon, Che-Ok,Lim, Jee-Min,Lee, Jae-Chan,Lee, Gye-Suk,Lee, Jung-Min,Xu, Li-Hua,Jiang, Cheng-Lin,Kim, Chang-Jin Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
A Gram-positive, spore-forming and moderately halophilic bacterium, strain BH139^(T), was isolated from saline sediment of Xinjiand Province, China. Cells of strain BH139^(T) were motile, flagellated rods. The organism grew optimally at 30-35℃ in the presence 12-14% (w/v) NaCl. The major fatty acids were branched saturated fatty acids such as iso-C_(16:0), anteiso-C_(15:0), iso-C_(15:0), iso-C_(14:0) and anteiso-C_(17:0). The G+C content of the genomic DNA was about 43 mol% and the predominant isoprenoid quinone was MK-7. Comparative 16S rRNA gene sequence analyses showed that strain BH139^(T) was most closely related to Lentibacillus salicampi KCCM 41560^(T) (96·9% 16S rRNA gene sequence similarity) and formed a distinct phyletic line from that species. On the basis of physiological and molecular properties, the isolate represents a novel species within the genus Lentibacillus, for which the name Lentibacillus salarius sp. nov. is proposed. The type strain is BH139^(T) (=KCTC 3911^(T)=DSM 16459^(T)).
Jeon, Che Ok,Park, Minjeong,Ro, Hyun-Su,Park, Woojun,Madsen, Eugene L. American Society for Microbiology 2006 Applied and environmental microbiology Vol.72 No.2
<B>ABSTRACT</B><P><I>Polaromonas naphthalenivorans</I> CJ2, found to be responsible for the degradation of naphthalene in situ at a coal tar waste-contaminated site (C.-O. Jeon et al., Proc. Natl. Acad. Sci. USA 100:13591-13596, 2003), is able to grow on mineral salts agar media with naphthalene as the sole carbon source. Beginning from a 484-bp <I>nagAc</I>-like region, we used a genome walking strategy to sequence genes encoding the entire naphthalene degradation pathway andadditional flanking regions. We found that the naphthalene catabolic genes in <I>P. naphthalenivorans</I> CJ2 were divided into one large and one small gene cluster, separated by an unknown distance. The large gene cluster (<I>nagRAaGHAbAcAdBFCQEDJI′ORF1tnpA</I>) is bounded by a LysR-type regulator (<I>nagR</I>). The small cluster (<I>nagR2ORF2I'KL</I>) is bounded by a MarR-type regulator (<I>nagR2</I>). The catabolic genes of <I>P. naphthalenivorans</I> CJ2 were homologous to many of those of <I>Ralstonia</I> U2, which uses the gentisate pathway to convert naphthalene to central metabolites. However, three open reading frames (<I>nagY</I>, <I>nagM</I>, and <I>nagN</I>), present in <I>Ralstonia</I> U2, were absent. Also, <I>P. naphthalenivorans</I> carries two copies of gentisate dioxygenase (<I>nagI</I>) with 77.4% DNA sequence identity to one another and 82% amino acid identity to their homologue in <I>Ralstonia</I> sp. strain U2. Investigation of the operons using reverse transcription PCR showed that each cluster was controlled independently by its respective promoter. Insertional inactivation and lacZ reporter assays showed that <I>nagR2</I> is a negative regulator and that expression of the small cluster is not induced by naphthalene, salicylate, or gentisate. Association of two putative <I>Azoarcus</I>-related transposases with the large cluster and one <I>Azoarcus</I>-related putative salicylate 5-hydroxylase gene (<I>ORF2</I>) in the small cluster suggests that mobile genetic elements were likely involved in creating the novel arrangement of catabolic and regulatory genes in <I>P. naphthalenivorans</I>.</P>
Jeon, Che-Ok,Lim, Jee-Min,Lee, Jung-Min,Xu, Li-Hua,Jiang, Cheng-Lin,Kim, Chang-Jin Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
A spore-forming, halophilic bacterium, designated strain BH163^(T), was isolated from a salt lake in China. Cells were motile, strictly aerobic rods that contained type A1γ peptidoglycan with meso-diaminopimelic acid as the diagnostic diamino acid. The isolate showed Gram- and catalase-positive reactions and formed a terminal endospore with a swollen sporangium. The major cellular fatty acids were anteiso-C_(15:0), iso-C_(15:0), anteiso-C_(17:0) and iso-C_(16:0). The genomic DNA G+C content of the strain was 41·0 mol%. Comparative analysis of 16S rRNA gene sequences showed that strain BH163^(T) formed a distinct line within the phyletic group classically defined as the genus Bacillus and was most closely related to the taxa [Bacillus] haloalkaliphilus DSM 5271^(T) and Filobacillus milosensis DSM 13259^(T), with 16S rRNA gene sequence similarities of 95·9 and 94·5%, respectively. On the basis of physiological and molecular properties, it is proposed that [Bacillus] haloalkaliphilus DSM 5271^(T) is reclassified in the new genus Alkalibacillus as Alkalibacillus haloalkaliphilus gen. nov., comb. nov. Strain BH163^(T) (=KCTC 3916^(T)=DSM 16460^(T)) was assigned as the type strain of the novel species Alkalibacillus salilacus.
메탄발효 효율향상을 위한 하,폐수 슬러지의 전처리 기술
전체옥 ( Che Ok Jeon ),남궁규철 ( Kyu Cheol Nam Kung ) 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 2010 한국미생물·생명공학회지 Vol.38 No.4
다양한 하·폐수 처리공정 중 혐기성 소화공정은 이산화탄소 배출을 감소시키고 생성되는 메탄을 에너지로서 사용할 수 있는 장점을 가지고 있다. 본 논문에서는 이러한 혐기성 소화공정의문제점과 보완점에 대해 살펴보았다. 가수분해과정은 혐기성 소화과정 중 율속단계에 해당하여 소화공정과정을 촉진시키고 바이오가스의 생산을 증가시키기 위하여 다양한 전처리 방법이 개발되어왔다. 현재 혐기성 소화 공정을 위한 전처리 방법 중 열처리 방법, 초음파 처리, 기계적 처리방법, 화학적 처리방법 등이 상업적으로 이용되고 있으며, 이들 공정은 슬러지 플록 또는 세포의 파괴를 통해 세포분획물이 생물학적으로 분해될 수 있는 형태로 전환시키는 것을 목적으로 한다. 이러한 과정들 모두는 특정 상황에 따른 장점과 단점을 모두 지니고 있으므로 각 공정과정에 대한 이해와 이를 통한 적용을 통해 특정 슬러지에 적합한 최적의 전처리 공정을 도출해 낼 필요가 있다. 또한 혐기성 소화공정의 효율증대와 경제성 확대를 위한 혐기성 소화공정 개발이 필요하다고 할 수 있다. Although different disposal routes of waste-activated sludge are possible, anaerobic digestion plays an important role for its abilities to further transform organic matter into methane. The potential of using methane as energy source has long been widely recognised and the present paper extensively reviews the principles of anaerobic digestion, the process parameters and hydrolysis. Hydrolysis is recognised as rate-limiting step in the complex digestion process. To accelerate the digestion and enhance the production of biogas, various pre-treatments can be used to improve the rate-limiting hydrolysis. These treatments include mechanical, thermal, chemical and biological interventions to the feedstock. All pre-treatments result in a lysis or disintegration of sludge cells, thus releasing and solubilizing intracellular material into the water phase and transforming refractory organic material into biodegradable species. The reader will finally be guided to extensive discussion for anaerobic digestion processes.