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Nahm, Chung Hyun,Choi, Jong Weon,Lee, Jongwook Institute for Clinical Science] 2008 Annals of clinical and laboratory science Vol.38 No.3
<P>This study investigated the relationship between calculated immature granulocyte (IG) counts and the severity of sepsis. Coagulation parameters, fibrinolytic indices, bacterial isolation rates in blood cultures, and mortality were observed in 237 patients with suspected sepsis. The difference in leukocyte subfractions (delta neutrophil index; DN) identified by a cytochemical myeloperoxidase reaction and by a nuclear lobularity assay was determined with a blood cell analyzer (ADVIA 120, Siemens, Inc.). DN was strongly correlated with manual IG counts (r = 0.75, p <0.05). Patients with high DN (>40%) averaged 40% lower in platelet count, 26% prolongation of prothrombin time (PT), and 35% diminution of antithrombin III (AT III) activity, vs those with low DN (5-20%). Overt disseminated intravascular coagulation was more prevalent as the DN increased, and reached a peak in patients with DN >40%. DN values were closely associated with PT (r = 0.35, p <0.05), AT III activity (r = -0.36, p <0.05), and platelet count (r = -0.27, p <0.05). Positive blood culture rate averaged 3.5-fold higher in patients with DN >40% vs the subgroup with low DN of 5-10%. The mortality rate of patients with DN >40% markedly exceeded the mortality rate of patients with DN of 5-10% (79% vs 15%, p <0.05). Thus, DN has implications for the severity of sepsis and may be valuable to assess the prognosis of patients with suspected sepsis.</P>
Nahm, Chang Hyun,Choi, Dong-Chan,Kwon, Hyeokpil,Lee, Seonki,Lee, Sang Hyun,Lee, Kibaek,Choo, Kwang-Ho,Lee, Jung-Kee,Lee, Chung-Hak,Park, Pyung-Kyu Elsevier 2017 Journal of membrane science Vol.526 No.-
<P><B>Abstract</B></P> <P>Quorum quenching (QQ) has been recognized as an innovative approach for biofouling control in membrane bioreactors (MBRs). Recently, QQ bacteria entrapping beads (QQ-beads) have been developed and verified to have excellent anti-biofouling potential in a pilot-scale MBR with flat-sheet membrane modules. In this study, considering the dense structure of hollow fiber (HF) bundles into which QQ-beads can hardly penetrate, QQ bacteria entrapping sheets (QQ-sheets) were developed as a new shape of QQ-media suitable for MBRs with HF modules. In a lab-scale MBR, QQ-sheets with a thickness of 0.5mm exhibited a greater physical washing effect than did QQ-beads with a diameter of 3.5mm because the former collided with membrane surfaces at the inner as well as the outer part of HF bundles, whereas the latter only made contact with the outer part. Moreover, QQ-sheets showed 2.5-fold greater biological QQ activity than did QQ-beads due to their greater total surface area at a fixed volume of QQ-media. These results suggest high potential for QQ-sheets to be used in MBRs with HF modules.</P> <P><B>Highlights</B></P> <P> <UL> <LI> QQ-sheets were developed to effectively mitigate biofouling in MBR with HF module. </LI> <LI> QQ-sheets effectively detached biofilm on both inner and outer part in HF module. </LI> <LI> QQ-sheets showed greater QQ activity than QQ-beads due to their higher surface area. </LI> <LI> The merits of QQ-sheets were confirmed in lab-scale continuous MBR with a HF module. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Chang Hyun Nahm ),( Seonki Lee ),( Sang Hyun Lee ),( Kibaek Lee ),( Jaewoo Lee ),( Hyeokpil Kwon ),( Kwang-ho Choo ),( Jung-kee Lee ),( Jae Young Jang ),( Chung-hak Lee ),( Pyung-kyu Park ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.3
Biofilm formation on the membrane surface results in the loss of permeability in membrane bioreactors (MBRs) for wastewater treatment. Studies have revealed that cellulose is not only produced by a number of bacterial species but also plays a key role during formation of their biofilm. Hence, in this study, cellulase was introduced to a MBR as a cellulose-induced biofilm control strategy. For practical application of cellulase to MBR, a cellulolytic (i.e., cellulaseproducing) bacterium, Undibacterium sp. DM-1, was isolated from a lab-scale MBR for wastewater treatment. Prior to its application to MBR, it was confirmed that the cell-free supernatant of DM-1 was capable of inhibiting biofilm formation and of detaching the mature biofilm of activated sludge and cellulose-producing bacteria. This suggested that cellulase could be an effective anti-biofouling agent for MBRs used in wastewater treatment. Undibacterium sp. DM-1-entrapping beads (i.e., cellulolytic-beads) were applied to a continuous MBR to mitigate membrane biofouling 2.2-fold, compared with an MBR with vacant-beads as a control. Subsequent analysis of the cellulose content in the biofilm formed on the membrane surface revealed that this mitigation was associated with an approximately 30% reduction in cellulose by cellulolytic-beads in MBR.
Chung, Pil Joong,Kim, Yeon Shic,Jeong, Jin Seo,Park, Su-Hyun,Nahm, Baek Hie,Kim, Ju-Kon Blackwell Publishing Ltd 2009 The Plant journal Vol.59 No.5
<P>Summary</P><P>We have previously isolated a rice gene encoding a histone deacetylase, <I>OsHDAC1</I>, and observed that its transgenic overexpression increases seedling root growth. To identify the transcriptional repression events that occur as a result of <I>OsHDAC1</I> overexpression (<I>OsHDAC1</I><SUP><I>OE</I></SUP>), a global profiling of root-expressed genes was performed on <I>OsHDAC1</I><SUP><I>OE</I></SUP> or HDAC inhibitor-treated non-transgenic (NT) roots, in comparison with untreated NT roots. We selected 39 genes that are induced and repressed in HDAC inhibitor-treated NT and <I>OsHDAC1</I><SUP><I>OE</I></SUP> roots, compared with NT roots, respectively. Interestingly, <I>OsNAC6</I>, a member of the NAM-ATAF-CUC (NAC) family, was identified as a key component of the OsHDAC1 regulon, and was found to be epigenetically repressed by OsHDAC1 overexpression. The root phenotype of <I>OsNAC6</I> knock-out seedlings was observed to be similar to that of the <I>OsHDAC1</I><SUP><I>OE</I></SUP> seedlings. Conversely, the root phenotype of the <I>OsNAC6</I> overexpressors was similar to that of the <I>OsHDAC1</I> knock-out seedlings. These observations indicate that OsHDAC1 negatively regulates the <I>OsNAC6</I> gene that primarily mediates the alteration in the root growth of the <I>OsHDAC1</I><SUP><I>OE</I></SUP> seedlings. Chromatin immunoprecipitation assays of the <I>OsNAC6</I> promoter region using antibodies specific to acetylated histones H3 and H4 revealed that OsHDAC1 epigenetically represses the expression of <I>OsNAC6</I> by deacetylating K9, K14 and K18 on H3 and K5, K12 and K16 on H4.</P>