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Hor-gil Hur - One of the best experts on this subject based on the ideXlab platform.
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sphaerotilus natans encrusted with nanoball shaped fe iii oxide minerals formed by nitrate reducing mixotrophic fe ii oxidation
FEMS Microbiology Ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
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Sphaerotilus natans encrusted with nanoball‐shaped Fe(III) oxide minerals formed by nitrate‐reducing mixotrophic Fe(II) oxidation
FEMS microbiology ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
Sunhwa Park - One of the best experts on this subject based on the ideXlab platform.
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sphaerotilus natans encrusted with nanoball shaped fe iii oxide minerals formed by nitrate reducing mixotrophic fe ii oxidation
FEMS Microbiology Ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
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Sphaerotilus natans encrusted with nanoball‐shaped Fe(III) oxide minerals formed by nitrate‐reducing mixotrophic Fe(II) oxidation
FEMS microbiology ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
Thomas H. Mcglashan - One of the best experts on this subject based on the ideXlab platform.
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Confirmatory factor analysis of DSM‐IV borderline, schizotypal, avoidant and obsessive‐compulsive personality disorders: findings from the Collaborative Longitudinal Personality Disorders Study
Acta psychiatrica Scandinavica, 2002Co-Authors: Charles A. Sanislow, Mary C Zanarini, Robert L Stout, Leslie C. Morey, John G. Gunderson, Andrew E. Skodol, Carlos M. Grilo, M. Tracie Shea, Thomas H. McglashanAbstract:Objective: To test the diagnostic constructs implied by DSM-IV Axis-II personality disorders by examining relationships between different combinations of DSM-IV criteria. Method: Confirmatory factor analysis was used to test the borderline, schizotypal, avoidant and obsessive-compulsive personality disorder constructs in a large treatment-seeking sample (N=668) from a multisite study. A model based on the three DSM-IV Axis II clusters was also tested. Both models were tested against a unitary ‘generic’ model constructed from four criteria sets combined. Results: Goodness-of-fit for both the three-cluster and four disorder models was significantly better than the unidimensional model, and the four-disorder model was significantly better than the three-cluster model. Results were replicated using data from 2-year follow-up obtained by interviewers blind to original Axis II diagnoses at baseline. Conclusion: Support is provided for the DSM-IV disorder-level classification for schizotypal, borderline, avoidant and obsessive-compulsive personality disorders in a treatment-seeking sample.
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confirmatory factor analysis of dsm iv borderline schizotypal avoidant and obsessive compulsive personality disorders findings from the collaborative longitudinal personality disorders study
Acta Psychiatrica Scandinavica, 2002Co-Authors: Charles A. Sanislow, Tracie M Shea, Mary C Zanarini, Robert L Stout, Leslie C. Morey, John G. Gunderson, Andrew E. Skodol, Carlos M. Grilo, Thomas H. McglashanAbstract:Objective: To test the diagnostic constructs implied by DSM-IV Axis-II personality disorders by examining relationships between different combinations of DSM-IV criteria. Method: Confirmatory factor analysis was used to test the borderline, schizotypal, avoidant and obsessive-compulsive personality disorder constructs in a large treatment-seeking sample (N=668) from a multisite study. A model based on the three DSM-IV Axis II clusters was also tested. Both models were tested against a unitary ‘generic’ model constructed from four criteria sets combined. Results: Goodness-of-fit for both the three-cluster and four disorder models was significantly better than the unidimensional model, and the four-disorder model was significantly better than the three-cluster model. Results were replicated using data from 2-year follow-up obtained by interviewers blind to original Axis II diagnoses at baseline. Conclusion: Support is provided for the DSM-IV disorder-level classification for schizotypal, borderline, avoidant and obsessive-compulsive personality disorders in a treatment-seeking sample.
Leslie C. Morey - One of the best experts on this subject based on the ideXlab platform.
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Relating DSM-5 section II and section III personality disorder diagnostic classification systems to treatment planning.
Comprehensive Psychiatry, 2016Co-Authors: Leslie C. Morey, Kathryn T. BensonAbstract:Abstract Background Beginning with DSM-III, the inclusion of a “personality” axis was designed to encourage awareness of personality disorders and the treatment-related implications of individual differences, but since that time there is little accumulated evidence that the personality disorder categories provide substantial treatment-related guidance. The DSM-5 Personality and Personality Disorders Work Group sought to develop an Alternative Model for personality disorder, and this study examined whether this model is more closely related to clinicians' decision-making processes than the traditional categorical personality disorder diagnoses. Procedures A national sample of 337 clinicians provided complete personality disorder diagnostic information and several treatment-related clinical judgments about one of their patients. Findings The dimensional concepts of the DSM-5 Alternative Model for personality disorders demonstrated stronger relationships than categorical DSM-IV/DSM-5 Section II diagnoses to 10 of 11 clinical judgments regarding differential treatment planning, optimal treatment intensity, and long-term prognosis. Conclusions The constructs of the DSM-5 Alternative Model for personality disorders may provide more clinically useful information for treatment planning than the official categorical personality disorder diagnostic system retained in DSM-5 Section II.
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Confirmatory factor analysis of DSM‐IV borderline, schizotypal, avoidant and obsessive‐compulsive personality disorders: findings from the Collaborative Longitudinal Personality Disorders Study
Acta psychiatrica Scandinavica, 2002Co-Authors: Charles A. Sanislow, Mary C Zanarini, Robert L Stout, Leslie C. Morey, John G. Gunderson, Andrew E. Skodol, Carlos M. Grilo, M. Tracie Shea, Thomas H. McglashanAbstract:Objective: To test the diagnostic constructs implied by DSM-IV Axis-II personality disorders by examining relationships between different combinations of DSM-IV criteria. Method: Confirmatory factor analysis was used to test the borderline, schizotypal, avoidant and obsessive-compulsive personality disorder constructs in a large treatment-seeking sample (N=668) from a multisite study. A model based on the three DSM-IV Axis II clusters was also tested. Both models were tested against a unitary ‘generic’ model constructed from four criteria sets combined. Results: Goodness-of-fit for both the three-cluster and four disorder models was significantly better than the unidimensional model, and the four-disorder model was significantly better than the three-cluster model. Results were replicated using data from 2-year follow-up obtained by interviewers blind to original Axis II diagnoses at baseline. Conclusion: Support is provided for the DSM-IV disorder-level classification for schizotypal, borderline, avoidant and obsessive-compulsive personality disorders in a treatment-seeking sample.
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confirmatory factor analysis of dsm iv borderline schizotypal avoidant and obsessive compulsive personality disorders findings from the collaborative longitudinal personality disorders study
Acta Psychiatrica Scandinavica, 2002Co-Authors: Charles A. Sanislow, Tracie M Shea, Mary C Zanarini, Robert L Stout, Leslie C. Morey, John G. Gunderson, Andrew E. Skodol, Carlos M. Grilo, Thomas H. McglashanAbstract:Objective: To test the diagnostic constructs implied by DSM-IV Axis-II personality disorders by examining relationships between different combinations of DSM-IV criteria. Method: Confirmatory factor analysis was used to test the borderline, schizotypal, avoidant and obsessive-compulsive personality disorder constructs in a large treatment-seeking sample (N=668) from a multisite study. A model based on the three DSM-IV Axis II clusters was also tested. Both models were tested against a unitary ‘generic’ model constructed from four criteria sets combined. Results: Goodness-of-fit for both the three-cluster and four disorder models was significantly better than the unidimensional model, and the four-disorder model was significantly better than the three-cluster model. Results were replicated using data from 2-year follow-up obtained by interviewers blind to original Axis II diagnoses at baseline. Conclusion: Support is provided for the DSM-IV disorder-level classification for schizotypal, borderline, avoidant and obsessive-compulsive personality disorders in a treatment-seeking sample.
Ji-hoon Lee - One of the best experts on this subject based on the ideXlab platform.
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sphaerotilus natans encrusted with nanoball shaped fe iii oxide minerals formed by nitrate reducing mixotrophic fe ii oxidation
FEMS Microbiology Ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
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Sphaerotilus natans encrusted with nanoball‐shaped Fe(III) oxide minerals formed by nitrate‐reducing mixotrophic Fe(II) oxidation
FEMS microbiology ecology, 2014Co-Authors: Sunhwa Park, Dong-hun Kim, Ji-hoon Lee, Hor-gil HurAbstract:Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by Sphaerotilus natans strain DSM 6575T under mixotrophic condition. Sphaerotilus natans has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575T grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575T are dominant under anoxic conditions. Furthermore, strain DSM 6575T forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, S. natans strain DSM 6575T, and could contribute to biogeochemical cycles of Fe and N in the environment.
