Search results for: Jacques Breton

Items from 1 to 20 out of 63 results

article

Sleep-Wake Patterns of Adolescents with Borderline Personality Disorder and Bipolar Disorder

Christophe Huỳnh, Jean-Marc Guilé, Jean-Jacques Breton, Roger Godbout

Child Psychiatry & Human Development > 2016 > 47 > 2 > 202-214

Sleep-wake patterns are rarely examined in adolescents with borderline personality disorder (BPD) or bipolar disorder (BD). Within a developmental perspective, this study explores the sleep-wake cycle of adolescents aged 12–17 years with BPD or BD and healthy controls (HC) during periods with and without entrainment by school/work schedules. Eighteen euthymic BPD, six euthymic BD, and 20 HC adolescents...

article

Treatment planning: A key milestone to prevent treatment dropout in adolescents with borderline personality disorder

Lyne Desrosiers, Micheline Saint‐Jean, Jean‐Jacques Breton

Psychology and Psychotherapy: Theory, Research and Practice > 88 > 2 > 178 - 196

ObjectiveThe aim of this study was to gain a broader appreciation of processes involved in treatment dropout in adolescents with borderline personality disorder (BPD). DesignA constructivist grounded theory was chosen using a multiple‐case research design with three embedded levels of analysis (adolescent, parent, and care setting). MethodTheoretical sampling and the different stages of analysis...

article

Cognitive correlates of serious suicidal ideation in a community sample of adolescents

Réal Labelle, Jean-Jacques Breton, Louise Pouliot, Marie-Josée Dufresne, more

Journal of Affective Disorders > 2013 > 145 > 3 > 370-377

Studies indicate that a dysfunctional attributional style, problem-solving deficits and hopelessness place youths at risk of developing suicidal thoughts and engaging in suicidal behaviour. However, in the realm of suicidality in adolescent, no study has examined the linkages between these three cognitive variables and suicidal ideation in non-clinical samples while taking into account the moderating...

article

Juvenile bipolar disorder and suicidality: a review of the last 10 years of literature

Natacha Halfon, Réal Labelle, David Cohen, Jean-Marc Guilé, more

European Child & Adolescent Psychiatry > 2013 > 22 > 3 > 139-151

Although children and adolescents with bipolar disorder (BD) are at elevated risk for suicide, little research to date has been conducted on suicidality in this population. The purpose of this descriptive review of the past 10 years of scientific literature on suicidality in youths with BD was to identify the risk and protective factors associated with this phenomenon, and to discuss the implications...

article

Nitric oxide activates an Nrf2/sulfiredoxin antioxidant pathway in macrophages

Kahina Abbas, Jacques Breton, Anne-Gaelle Planson, Cécile Bouton, more

Free Radical Biology and Medicine > 2011 > 51 > 1 > 107-114

Peroxiredoxins (Prx's) are a family of peroxidases that maintain thiol homeostasis by catalyzing the reduction of organic hydroperoxides, H ₂ O ₂ , and peroxynitrite. Under conditions of oxidative stress, eukaryotic Prx's can be inactivated by the substrate-dependent oxidation of the catalytic cysteine to sulfinic acid, which may regulate the intracellular messenger function of H ...

article

Signaling events leading to peroxiredoxin 5 up-regulation in immunostimulated macrophages

Kahina Abbas, Jacques Breton, Cédric R. Picot, Valérie Quesniaux, more

Free Radical Biology and Medicine > 2009 > 47 > 6 > 794-802

Peroxiredoxins (PRXs) are thiol peroxidases associated with many cellular functions including proliferation, cell cycle, apoptosis, and differentiation. There is also increasing evidence that these ubiquitous antioxidant enzymes control H ₂ O ₂ signaling in eukaryotes. Here, we provide evidence that the LPS/TLR4 and the Th1 cytokine IFN-γ pathways induce expression of PRX5, a potent...

article

Identification of the Intermediate Charge-Separated State P+βL− in a Leucine M214 to Histidine Mutant of the Rhodobacter sphaeroides Reaction Center Using Femtosecond Midinfrared Spectroscopy

Natalia P. Pawlowicz, Ivo H.M. van Stokkum, Jacques Breton, Rienk van Grondelle, more

Biophysical Journal > 2009 > 96 > 12 > 4956-4965

Energy and electron transfer in a Leu M214 to His (LM214H) mutant of the Rhodobacter sphaeroides reaction center (RC) were investigated by applying time-resolved visible pump/midinfrared probe spectroscopy at room temperature. This mutant replacement of the Leu at position M214 resulted in the incorporation of a bacteriochlorophyll (BChl) in place of the native bacteriopheophytin in the L-branch of...

article

The interplay between nitric oxide and peroxiredoxins

Kahina Abbas, Jacques Breton, Jean-Claude Drapier

Immunobiology > 2008 > 213 > 9-10 > 815-822

Peroxiredoxins participate in the antioxidant response by reducing H ₂ O ₂ , organic peroxides and peroxynitrite. Peroxiredoxins have a conserved NH ₂ -terminal cysteine residue that is oxidized to sulfenic acid during catalysis of peroxide reduction. In eukaryotes, the sulfenic acid can be further oxidized to a sulfinic acid. Resulting inactivation of peroxiredoxins favors...

article

Coupling of electron transfer to proton uptake at the QB site of the bacterial reaction center: A perspective from FTIR difference spectroscopy

Eliane Nabedryk, Jacques Breton

BBA - Bioenergetics > 2008 > 1777 > 10 > 1229-1248

FTIR difference spectroscopy provides a unique approach to study directly protonation/deprotonation events of carboxylic acids involved in the photochemical cycle of membrane proteins, such as the bacterial photosynthetic reaction center (RC). In this work, we review the data obtained by light-induced FTIR difference spectroscopy on the first electron transfer to the secondary quinone Q _B ...

article

Identification of the First Steps in Charge Separation in Bacterial Photosynthetic Reaction Centers of Rhodobacter sphaeroides by Ultrafast Mid-Infrared Spectroscopy: Electron Transfer and Protein Dynamics

Natalia P. Pawlowicz, Rienk van Grondelle, Ivo H.M. van Stokkum, Jacques Breton, more

Biophysical Journal > 2008 > 95 > 3 > 1268-1284

Time-resolved visible pump/mid-infrared (mid-IR) probe spectroscopy in the region between 1600 and 1800cm⁻¹ was used to investigate electron transfer, radical pair relaxation, and protein relaxation at room temperature in the Rhodobacter sphaeroides reaction center (RC). Wild-type RCs both with and without the quinone electron acceptor Q_A, were excited at 600nm (nonselective excitation), 800nm (direct...

article

Primary Charge Separation in the Photosystem II Core from Synechocystis: A Comparison of Femtosecond Visible/Midinfrared Pump-Probe Spectra of Wild-Type and Two P680 Mutants

Mariangela Di Donato, Rachel O. Cohen, Bruce A. Diner, Jacques Breton, more

Biophysical Journal > 2008 > 94 > 12 > 4783-4795

It is now quite well accepted that charge separation in PS2 reaction centers starts predominantly from the accessory chlorophyll B_A and not from the special pair P₆₈₀. To identify spectral signatures of B_A, and to further clarify the process of primary charge separation, we compared the femtosecond-infrared pump-probe spectra of the wild-type (WT) PS2 core complex from the cyanobacterium Synechocystis...

article

The Unusually Strong Hydrogen Bond between the Carbonyl of Q _A and His M219 in the Rhodobacter sphaeroides Reaction Center Is Not Essential for Efficient Electron Transfer from Q _A ^- to Q _B ^†

Jacques Breton, Jérôme Lavergne, Marion C. Wakeham, Eliane Nabedryk, more

Biochemistry > 2007 > 46 > 22 > 6468 - 6476

article

Steady-State FTIR Spectra of the Photoreduction of Q _A and Q _B in Rhodobacter sphaeroides Reaction Centers Provide Evidence against the Presence of a Proposed Transient Electron Acceptor X between the Two Quinones

Jacques Breton

Biochemistry > 2007 > 46 > 15 > 4459 - 4465

article

Monitoring the pH Dependence of IR Carboxylic Acid Signals upon Q _B ^- Formation in the Glu-L212 → Asp/Asp-L213 → Glu Swap Mutant Reaction Center from Rhodobacter sphaeroides ^†

Eliane Nabedryk, Mark L. Paddock, Melvin Y. Okamura, Jacques Breton

Biochemistry > 2007 > 46 > 5 > 1176 - 1182

article

Replacement or exclusion of the B-branch bacteriopheophytin in the purple bacterial reaction centre: The HB cofactor is not required for assembly or core function of the Rhodobacter sphaeroides complex

Ashley J. Watson, Paul K. Fyfe, Dmitrij Frolov, Marion C. Wakeham, more

BBA - Bioenergetics > 2005 > 1710 > 1 > 34-46

All of the membrane-embedded cofactors of the purple bacterial reaction centre have well-defined functional or structural roles, with the exception of the bacteriopheophytin (H _B ) located approximately half-way across the membrane on the so-called inactive- or B-branch of cofactors. Sequence alignments indicate that this bacteriochlorin cofactor is a conserved feature of purple bacterial...

article

An Isotope-Edited FTIR Investigation of the Role of Ser-L223 in Binding Quinone (Q _B ) and Semiquinone (Q _B ^- ) in the Reaction Center from Rhodobacter sphaeroides ^†

Eliane Nabedryk, Mark L. Paddock, Melvin Y. Okamura, Jacques Breton

Biochemistry > 2005 > 44 > 44 > 14519 - 14527

article

Evidence for Hydrogen Bond Formation to the PsaB Chlorophyll of P700 in Photosystem I Mutants of Synechocystis sp. PCC 6803

Jacques Breton, Parag R. Chitnis, Maria Pantelidou

Biochemistry > 2005 > 44 > 14 > 5402 - 5408

article

FTIR Spectroscopy of Synechocystis 6803 Mutants Affected on the Hydrogen Bonds to the Carbonyl Groups of the PsaA Chlorophyll of P700 Supports an Extensive Delocalization of the Charge in P700 ⁺ ^†

Maria Pantelidou, Parag R. Chitnis, Jacques Breton

Biochemistry > 2004 > 43 > 26 > 8380 - 8390

article

Characterization of the bonding interactions of Q _B upon photoreduction via A-branch or B-branch electron transfer in mutant reaction centers from Rhodobacter sphaeroides

Jacques Breton, Marion C. Wakeham, Paul K. Fyfe, Michael R. Jones, more

BBA - Bioenergetics > 2004 > 1656 > 2-3 > 127-138

In Rhodobacter sphaeroides reaction centers (RCs) containing the mutation Ala M260 to Trp (AM260W), transmembrane electron transfer along the full-length of the A-branch of cofactors is prevented by the loss of the Q _A ubiquinone, but it is possible to generate the radical pair P ⁺ H _A ^- by A-branch electron transfer or the radical pair P ⁺ Q _B ^- by...

article

Identification of a Novel Protonation Pattern for Carboxylic Acids upon Q _B Photoreduction in Rhodobacter sphaeroides Reaction Center Mutants at Asp-L213 and Glu-L212 Sites ^†

Eliane Nabedryk, Jacques Breton, Melvin Y. Okamura, Mark L. Paddock

Biochemistry > 2004 > 43 > 23 > 7236 - 7243

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Keywords

PHOTOSYNTHESIS (6)
ADOLESCENT (3)
BACTERIOCHLOROPHYLL (3)
FTIR (3)
FTIR SPECTROSCOPY (3)
QUINONE (3)
REACTION CENTER (3)
REDOX SIGNALING (3)
BORDERLINE PERSONALITY DISORDER (2)
CORRELATES (2)
CYTOCHROME C OXIDASE (2)
ELECTRON TRANSFER (2)
ENERGY TRANSFER (2)
FREE RADICALS (2)
LINEAR DICHROISM (2)
MACROPHAGE (2)
NITRIC OXIDE (2)
PEROXIREDOXIN (2)
PHOTOSYNTHETIC REACTION CENTER (2)
PRIMARY ELECTRON DONOR (2)
RHODOBACTER SPHAEROIDES (2)
SULFIREDOXIN (2)
F 6 9 5 (1)
1H/2H EXCHANGE (1)
C. TEPIDUM (1)
1H NMR (1)
ACTIGRAPHY (1)
ADOLESCENTS (1)
ADOLESCENTS AND PARENTS (1)
ASSIGNMENT (1)
ASYMMETRY (1)
ATTENUATED TOTAL REFLECTION. (1)
B-BRANCH (1)
BACTERIAL PHOTOSYNTHESIS (1)
BACTERIOPHEOPHYTIN (1)
BACTERIOPHYLL (1)
BIPOLAR (1)
BIPOLAR DISORDER (1)
CARBOXYLIC ACID (1)
CHARGE RECOMBINATION LUMINESCENCE (1)
CHILDREN (1)
CHLOROPHYLL (1)
CHLOROPHYLL-PROTEIN (1)
CHLOROPHYLL-PROTEIN COMPLEX (1)
CHLOROPLAST (1)
CIRCADIAN RHYTHM (1)
COGNITION (1)
CYANOBACTERIA (1)
CYTOCHROME C-TYPE (1)
CYTOCHROME HEME (1)
CYTOKINES (1)
D. AFRICANUS (1)
DEPRESSION (1)
DISENGAGEMENT (1)
ELECTRON ACCEPTOR (1)
ELECTRON PARAMAGNETIC RESONANCE (1)
ENGAGEMENT (1)
EXTERNALIZING DISORDERS (1)
F STATE (1)
FERREDOXIN (1)
FISCHERELLA PCC 7603 (1)
FLUORESCENCE (1)
FOURIER TRANSFORM INFRARED (1)
FOURIER TRANSFORM INFRARED DIFFERENCE SPECTROSCOPY (1)
FOURIER TRANSFORM INFRARED SPECTROSCOPY (1)
FTIR DIFFERENCE SPECTROSCOPY (1)
GEL SQUEEZING (1)
GENDER (1)
HYDROGEN PEROXIDE (1)
IMMUNOSTIMULATION (1)
INFORMANT SPECIFICITY (1)
INFRARED (1)
INFRARED DICHROISM (1)
INTERMEDIATE (1)
INTERNALIZING DISORDERS (1)
IRON-SULFUR CLUSTER (1)
IRON-SULPHUR PROTEIN (1)
ISOTOPE LABELING (1)
LIPOPOLYSACCHARIDE (1)
LOW TEMPERATURE FLUORESCENCE (1)
LOW-TEMPERATURE SPECTROSCOPY (1)
MACROPHAGES (1)
MENTAL DISORDERS (1)
MESOMERIC RESONANCE (1)
MUTAGENESIS (1)
NMR SPECTROSCOPY FERREDOXINS DICLUSTER HYPERFINE SHIFTS CLUSTER LIGANDS (1)
OPTICAL SPECTROSCOPY (1)
OXIDATIVE STRESS (1)
P STATE (1)
P840 (1)
PERIPLASMIC NITRATE REDUCTASE (1)
PEROXIDE (1)
PEROXIREDOXINS (1)
PHEOPHYTIN (1)
PHOTOSYNTHETIC BACTERIAL REACTION CENTER (1)
PHOTOSYNTHETIC MEMBRANE (1)
PHOTOSYSTEM (1)
PHOTOSYSTEM 2 (1)
PHOTOSYSTEM I (1)
PHYCOBILIPROTEIN (1)
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Data set

Elsevier (34)
ACS (18)
Springer (10)
Wiley (1)

Journal

Biochemistry (17)
FEBS Letters (10)
BBA - Bioenergetics (9)
Biophysical Journal (6)
Photosynthesis Research (6)
Free Radical Biology and Medicine (2)
Chemical Physics Letters (1)
Child Psychiatry & Human Development (1)
European Child & Adolescent Psychiatry (1)
Immunobiology (1)
JBIC Journal of Biological Inorganic Chemistry (1)
Journal of Abnormal Child Psychology (1)
Journal of Affective Disorders (1)
Journal of Inorganic Biochemistry (1)
Journal of the American Academy of Child & Adolescent Psychiatry (1)
Psychology and Psychotherapy: Theory, Research and Practice (1)
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (1)
Tetrahedron (1)
The Journal of Physical Chemistry B (1)
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INFONA - science communication portal

Search results for: Jacques Breton

Sleep-Wake Patterns of Adolescents with Borderline Personality Disorder and Bipolar Disorder

Treatment planning: A key milestone to prevent treatment dropout in adolescents with borderline personality disorder

Cognitive correlates of serious suicidal ideation in a community sample of adolescents

Juvenile bipolar disorder and suicidality: a review of the last 10 years of literature

Nitric oxide activates an Nrf2/sulfiredoxin antioxidant pathway in macrophages

Signaling events leading to peroxiredoxin 5 up-regulation in immunostimulated macrophages

Identification of the Intermediate Charge-Separated State P+βL− in a Leucine M214 to Histidine Mutant of the Rhodobacter sphaeroides Reaction Center Using Femtosecond Midinfrared Spectroscopy

The interplay between nitric oxide and peroxiredoxins

Coupling of electron transfer to proton uptake at the QB site of the bacterial reaction center: A perspective from FTIR difference spectroscopy

Identification of the First Steps in Charge Separation in Bacterial Photosynthetic Reaction Centers of Rhodobacter sphaeroides by Ultrafast Mid-Infrared Spectroscopy: Electron Transfer and Protein Dynamics

Primary Charge Separation in the Photosystem II Core from Synechocystis: A Comparison of Femtosecond Visible/Midinfrared Pump-Probe Spectra of Wild-Type and Two P680 Mutants

The Unusually Strong Hydrogen Bond between the Carbonyl of Q _A and His M219 in the Rhodobacter sphaeroides Reaction Center Is Not Essential for Efficient Electron Transfer from Q _A ^- to Q _B ^†

Steady-State FTIR Spectra of the Photoreduction of Q _A and Q _B in Rhodobacter sphaeroides Reaction Centers Provide Evidence against the Presence of a Proposed Transient Electron Acceptor X between the Two Quinones

Monitoring the pH Dependence of IR Carboxylic Acid Signals upon Q _B ^- Formation in the Glu-L212 → Asp/Asp-L213 → Glu Swap Mutant Reaction Center from Rhodobacter sphaeroides ^†

Replacement or exclusion of the B-branch bacteriopheophytin in the purple bacterial reaction centre: The HB cofactor is not required for assembly or core function of the Rhodobacter sphaeroides complex

An Isotope-Edited FTIR Investigation of the Role of Ser-L223 in Binding Quinone (Q _B ) and Semiquinone (Q _B ^- ) in the Reaction Center from Rhodobacter sphaeroides ^†

Evidence for Hydrogen Bond Formation to the PsaB Chlorophyll of P700 in Photosystem I Mutants of Synechocystis sp. PCC 6803

FTIR Spectroscopy of Synechocystis 6803 Mutants Affected on the Hydrogen Bonds to the Carbonyl Groups of the PsaA Chlorophyll of P700 Supports an Extensive Delocalization of the Charge in P700 ⁺ ^†

Characterization of the bonding interactions of Q _B upon photoreduction via A-branch or B-branch electron transfer in mutant reaction centers from Rhodobacter sphaeroides

Identification of a Novel Protonation Pattern for Carboxylic Acids upon Q _B Photoreduction in Rhodobacter sphaeroides Reaction Center Mutants at Asp-L213 and Glu-L212 Sites ^†

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