LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 13

Search options

  1. Article ; Online: Rapid exchange cooling with trapped ions.

    Fallek, Spencer D / Sandhu, Vikram S / McGill, Ryan A / Gray, John M / Tinkey, Holly N / Clark, Craig R / Brown, Kenton R

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 1089

    Abstract: The trapped-ion quantum charge-coupled device (QCCD) architecture is a leading candidate for advanced quantum information processing. In current QCCD implementations, imperfect ion transport and anomalous heating can excite ion motion during a ... ...

    Abstract The trapped-ion quantum charge-coupled device (QCCD) architecture is a leading candidate for advanced quantum information processing. In current QCCD implementations, imperfect ion transport and anomalous heating can excite ion motion during a calculation. To counteract this, intermediate cooling is necessary to maintain high-fidelity gate performance. Cooling the computational ions sympathetically with ions of another species, a commonly employed strategy, creates a significant runtime bottleneck. Here, we demonstrate a different approach we call exchange cooling. Unlike sympathetic cooling, exchange cooling does not require trapping two different atomic species. The protocol introduces a bank of "coolant" ions which are repeatedly laser cooled. A computational ion can then be cooled by transporting a coolant ion into its proximity. We test this concept experimentally with two
    Language English
    Publishing date 2024-02-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-45232-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Characterization of a vacuum ultraviolet light source at 118 nm.

    Gray, John M / Bossert, Jason / Shyur, Yomay / Saarel, Ben / Briles, Travis C / Lewandowski, H J

    The Journal of chemical physics

    2021  Volume 154, Issue 2, Page(s) 24201

    Abstract: Vacuum ultraviolet (VUV) light at 118 nm has been shown to be a powerful tool to ionize molecules for various gas-phase chemical studies. A convenient table top source of 118 nm light can be produced by frequency tripling 355 nm light from a Nd:YAG laser ...

    Abstract Vacuum ultraviolet (VUV) light at 118 nm has been shown to be a powerful tool to ionize molecules for various gas-phase chemical studies. A convenient table top source of 118 nm light can be produced by frequency tripling 355 nm light from a Nd:YAG laser in xenon gas. This process has a low efficiency, typically producing only nJ/pulse of VUV light. Simple models of the tripling process predict that the power of 118 nm light produced should increase quadratically with increasing xenon pressure. However, experimental 118 nm production has been observed to reach a maximum and then decrease to zero with increasing xenon pressure. Here, we describe the basic theory and experimental setup for producing 118 nm light and a new proposed model for the mechanism limiting the production based on pressure broadened absorption.
    Language English
    Publishing date 2021-01-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0033135
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: The effect of self-monitoring on Wisconsin Card Sorting Test performance in euthymic patients with bipolar disorder: a pilot study.

    Robinson, Lucy J / Gray, John M / Ferrier, I Nicol / Gallagher, Peter

    Cognitive neuropsychiatry

    2016  Volume 21, Issue 3, Page(s) 256–270

    Abstract: Objectives: Euthymic patients with bipolar disorder (BD) show executive impairment. Assisting cognitive function with non-pharmacological strategies has not been widely explored in BD. In schizophrenia, concomitant verbalisation (self-monitoring) during ...

    Abstract Objectives: Euthymic patients with bipolar disorder (BD) show executive impairment. Assisting cognitive function with non-pharmacological strategies has not been widely explored in BD. In schizophrenia, concomitant verbalisation (self-monitoring) during executive tests improved performance. The present pilot study assesses the effects of self-monitoring whilst completing the Wisconsin Card Sorting Test (WCST) in BD patients.
    Methods: Thirty-six euthymic BD patients and 42 healthy controls participated. Twenty patients with BD and 20 controls received standard administration and 16 patients and 22 controls used self-monitoring during the test.
    Results: ANCOVA revealed a significant "group by administration" interaction. Patients who received the standard administration were significantly worse than healthy controls (trials administered: p = .012, η p (2) = 0.17; trials to first category: p = .046, η p (2) = 0.11; failure to maintain set: p = .003, η p (2) = 0.23). BD patients who self-monitored performed significantly better than patients receiving the standard administration (trials to first category: p = .020, η p (2) = 0.17) and showed no significant differences in performance compared to controls.
    Conclusion: Self-monitoring deserves further investigation as a tool that may be helpful for patients with BD. Further exploration of the utility, generalisability, and stability of the effects of self-monitoring is needed.
    MeSH term(s) Adolescent ; Adult ; Bipolar Disorder/psychology ; Case-Control Studies ; Cognition Disorders/psychology ; Female ; Humans ; Male ; Middle Aged ; Neuropsychological Tests ; Pilot Projects ; Self Concept ; Young Adult
    Language English
    Publishing date 2016-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2028330-1
    ISSN 1464-0619 ; 1354-6805
    ISSN (online) 1464-0619
    ISSN 1354-6805
    DOI 10.1080/13546805.2016.1184134
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Processing of Facial Emotion in Bipolar Depression and Euthymia.

    Robinson, Lucy J / Gray, John M / Burt, Mike / Ferrier, I Nicol / Gallagher, Peter

    Journal of the International Neuropsychological Society : JINS

    2015  Volume 21, Issue 9, Page(s) 709–721

    Abstract: Previous studies of facial emotion processing in bipolar disorder (BD) have reported conflicting findings. In independently conducted studies, we investigate facial emotion labeling in euthymic and depressed BD patients using tasks with static and ... ...

    Abstract Previous studies of facial emotion processing in bipolar disorder (BD) have reported conflicting findings. In independently conducted studies, we investigate facial emotion labeling in euthymic and depressed BD patients using tasks with static and dynamically morphed images of different emotions displayed at different intensities. Study 1 included 38 euthymic BD patients and 28 controls. Participants completed two tasks: labeling of static images of basic facial emotions (anger, disgust, fear, happy, sad) shown at different expression intensities; the Eyes Test (Baron-Cohen, Wheelwright, Hill, Raste, & Plumb, 2001), which involves recognition of complex emotions using only the eye region of the face. Study 2 included 53 depressed BD patients and 47 controls. Participants completed two tasks: labeling of "dynamic" facial expressions of the same five basic emotions; the Emotional Hexagon test (Young, Perret, Calder, Sprengelmeyer, & Ekman, 2002). There were no significant group differences on any measures of emotion perception/labeling, compared to controls. A significant group by intensity interaction was observed in both emotion labeling tasks (euthymia and depression), although this effect did not survive the addition of measures of executive function/psychomotor speed as covariates. Only 2.6-15.8% of euthymic patients and 7.8-13.7% of depressed patients scored below the 10th percentile of the controls for total emotion recognition accuracy. There was no evidence of specific deficits in facial emotion labeling in euthymic or depressed BD patients. Methodological variations-including mood state, sample size, and the cognitive demands of the tasks-may contribute significantly to the variability in findings between studies.
    MeSH term(s) Adult ; Bipolar Disorder/psychology ; Case-Control Studies ; Depression/psychology ; Emotions ; Executive Function ; Facial Expression ; Female ; Humans ; Male ; Middle Aged ; Psychomotor Performance
    Language English
    Publishing date 2015-10-16
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1230632-0
    ISSN 1469-7661 ; 1355-6177
    ISSN (online) 1469-7661
    ISSN 1355-6177
    DOI 10.1017/S1355617715000909
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Performance monitoring and executive control of attention in euthymic bipolar disorder: employing the CPT-AX paradigm.

    Robinson, Lucy J / Thompson, Jill M / Gallagher, Peter / Gray, John M / Young, Allan H / Ferrier, I Nicol

    Psychiatry research

    2013  Volume 210, Issue 2, Page(s) 457–464

    Abstract: Reduced cognitive test performance has been demonstrated in patients with bipolar disorder (BD), even when euthymic. Several studies have explored aspects of attention, including sustained attention, and reported patients show lower accuracy compared to ... ...

    Abstract Reduced cognitive test performance has been demonstrated in patients with bipolar disorder (BD), even when euthymic. Several studies have explored aspects of attention, including sustained attention, and reported patients show lower accuracy compared to controls. It is necessary to modify existing attentional paradigms to fully characterise such deficits. The present study sought to examine if there are changes in the profile of performance and error-types during a sustained attention task in BD. Twenty-two euthymic patients with DSM-IV diagnosed BD and 21 healthy controls were recruited. Participants completed a modified CPT-AX paradigm with a high proportion of target trials (70%) with cues and probes presented at continuous intervals. This modification increases the demands on response inhibition and permits the deconstruction of attentional/executive deficits previously described. Overall, BD patients showed significantly poorer target discriminability compared to controls. In block one (first quarter) of the task, patients showed no significant differences to controls, but by the final fourth block (last quarter) they made significantly fewer hits and more errors (both 'AX' misses and 'BX' false alarms). BD patients completed initial stages of the task similarly to controls, but as demands on the attentional system continued difficulties emerged, consistent with problems in context-maintenance.
    MeSH term(s) Adult ; Attention/physiology ; Bipolar Disorder/complications ; Bipolar Disorder/psychology ; Case-Control Studies ; Diagnostic and Statistical Manual of Mental Disorders ; Executive Function/physiology ; Female ; Humans ; Interviews as Topic ; Male ; Middle Aged ; Psychiatric Status Rating Scales/statistics & numerical data ; Psychomotor Performance/physiology ; Reaction Time/physiology ; Task Performance and Analysis
    Language English
    Publishing date 2013-12-15
    Publishing country Ireland
    Document type Journal Article
    ZDB-ID 445361-x
    ISSN 1872-7123 ; 1872-7506 ; 0925-4927 ; 0165-1781
    ISSN (online) 1872-7123 ; 1872-7506
    ISSN 0925-4927 ; 0165-1781
    DOI 10.1016/j.psychres.2013.06.039
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: Neurocognitive function following remission in major depressive disorder: potential objective marker of response?

    Gallagher, Peter / Robinson, Lucy J / Gray, John M / Porter, Richard J / Young, Allan H

    The Australian and New Zealand journal of psychiatry

    2007  Volume 41, Issue 1, Page(s) 54–61

    Abstract: Objective: Neurocognitive deficits have been widely reported in patients with mood disorders. However, relatively little is known of the short-term trajectory of neurocognitive improvement once treatment has been initiated.: Method: A neurocognitive ... ...

    Abstract Objective: Neurocognitive deficits have been widely reported in patients with mood disorders. However, relatively little is known of the short-term trajectory of neurocognitive improvement once treatment has been initiated.
    Method: A neurocognitive test battery was administered to unipolar depressed (major depressive disorder, MDD) patients (aged 18-65 years) who had been medication-free for at least 6 weeks, and to healthy controls. Patients were then treated according to clinical need, predominantly with standard pharmacotherapy, and all participants were followed up within 6 months.
    Results: Of the 25 MDD patients who returned at follow up, 11 were defined as remitted and 14 as not remitted. Significantly less baseline psychomotor dysfunction was observed in patients who remitted compared to those who did not (effect size, d =0.78, 95% confidence interval (CI) =0.07-1.44). Analysis of the change scores between assessments revealed a significantly greater improvement in verbal memory in patients who remitted compared to those who did not (d =0.73, 95%CI =0.03-1.39).
    Conclusions: This preliminary report suggests that there may be distinct temporal trajectories of neurocognitive improvement following remission in MDD. Aspects of neurocognitive functioning should be examined further as a means of providing a useful objective marker of treatment response.
    MeSH term(s) Adolescent ; Adult ; Brain/physiopathology ; Cognition Disorders/diagnosis ; Cognition Disorders/etiology ; Cognition Disorders/physiopathology ; Depressive Disorder, Major/psychology ; Diagnostic and Statistical Manual of Mental Disorders ; Female ; Follow-Up Studies ; Humans ; Male ; Middle Aged ; Neuropsychological Tests ; Paired-Associate Learning ; Psychometrics ; Remission Induction ; Severity of Illness Index
    Language English
    Publishing date 2007-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 221140-3
    ISSN 1440-1614 ; 0004-8674
    ISSN (online) 1440-1614
    ISSN 0004-8674
    DOI 10.1080/00048670601057734
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Differential deficit in executive control in euthymic bipolar disorder.

    Thompson, Jill Maria / Gray, John M / Crawford, John R / Hughes, John H / Young, Allan H / Ferrier, I Nicol

    Journal of abnormal psychology

    2009  Volume 118, Issue 1, Page(s) 146–160

    Abstract: Patients with remitted bipolar disorder (BD) have persistent cognitive deficits, but the nature and specificity of this deficit remain unclear. The authors evaluated the executive hypothesis of BD by determining whether (a) patients' executive deficits ... ...

    Abstract Patients with remitted bipolar disorder (BD) have persistent cognitive deficits, but the nature and specificity of this deficit remain unclear. The authors evaluated the executive hypothesis of BD by determining whether (a) patients' executive deficits qualify as differential deficits, that is, that these significantly exceed deficits in other cognitive domains; (b) deficits in particular executive functions are evident, and (c) executive difficulties mediate declarative memory deficits in BD. The cognitive performance of 63 prospectively verified euthymic bipolar patients was compared with controls, using J. Baron and R. Trieman's (1980) method of testing for differences in nonindependent correlations. There were no differential deficits within the executive domain. Patients' generic executive performance was differentially impaired relative to primary verbal memory and retention in declarative memory, but not relative to their declarative recall, recognition, or their psychomotor performance. However, patients' executive deficit was not an artifact of their poor psychomotor performance. Executive performance accounted for all but a trivial portion of the between-group variance in declarative memory. Persistent cognitive difficulties in euthymic bipolar disorder (EBD) are thus usefully characterized as a generic dysexecutive syndrome.
    MeSH term(s) Bipolar Disorder/epidemiology ; Cognition Disorders/diagnosis ; Cognition Disorders/epidemiology ; Diagnostic and Statistical Manual of Mental Disorders ; Female ; Humans ; Male ; Memory Disorders/diagnosis ; Memory Disorders/epidemiology ; Middle Aged ; Neuropsychological Tests ; Prospective Studies ; Psychomotor Disorders/diagnosis ; Psychomotor Disorders/epidemiology ; Recovery of Function ; Retention (Psychology) ; Severity of Illness Index
    Language English
    Publishing date 2009-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3127-6
    ISSN 1939-1846 ; 0021-843X ; 0096-851X ; 0145-2339 ; 0145-2347
    ISSN (online) 1939-1846
    ISSN 0021-843X ; 0096-851X ; 0145-2339 ; 0145-2347
    DOI 10.1037/a0014740
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Book ; Online: Schools on the Edge

    MacBeath, John / Cullen, Jane / Frost, David / Gray, John M / Steward, Susan / Swaffield, Sue

    Responding to Challenging Circumstances

    2006  

    Abstract: An ideal text for challenging the thinking of those studying for NPQH… The conclusion by the authors suggests nine major points to consider if improvement for schools in extremely challenging circumstances is to happen and be sustained. These 'nine ... ...

    Abstract 'An ideal text for challenging the thinking of those studying for NPQH… The conclusion by the authors suggests nine major points to consider if improvement for schools in extremely challenging circumstances is to happen and be sustained. These 'nine lesson for policy makers' are very frank and pertinent points, let's hope at least some of our policy makers read them!' - ESCalate 'Rarely does a book on education reform capture both the big and the small picture with such brilliant clarity. MacBeath and his colleagues furnish a 'no holds barred' account of the ins and outs of understanding an
    Language English
    Size Online-Ressource (167 p)
    Publisher SAGE Publications
    Publishing place London
    Document type Book ; Online
    Note Description based upon print version of record
    ISBN 9781412929707 ; 1412929709
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

  9. Article: Impaired working memory monitoring in euthymic bipolar patients.

    Thompson, Jill M / Gray, John M / Hughes, John H / Watson, Stuart / Young, Allan H / Ferrier, I Nicol

    Bipolar disorders

    2007  Volume 9, Issue 5, Page(s) 478–489

    Abstract: Objectives: Converging evidence suggests that patients with remitted bipolar disorder (BD) have a persistent cognitive deficit in the executive control of working memory (WM). However, the component operations that contribute to this deficit remain ... ...

    Abstract Objectives: Converging evidence suggests that patients with remitted bipolar disorder (BD) have a persistent cognitive deficit in the executive control of working memory (WM). However, the component operations that contribute to this deficit remain unclear. The aim of the present study was to further profile the nature and specificity of WM impairment in euthymic BD.
    Methods: Fifty DSM-IV-confirmed patients with euthymic BD and demographically matched controls completed a modified version of the Self-Ordered Pointing Task (SOPT) and the Cambridge Neuropsychological Test Automated Battery Pattern Recognition Test along with traditional executive and WM tasks [Stroop, initial letter Verbal Fluency (FAS), Trail-Making, Digits Forwards and Backwards]. Prospective clinical ratings over one month prior to testing confirmed that patients were euthymic at test. Absence of basal hypercortisolaemia was confirmed by serial saliva sampling.
    Results: Error analysis revealed that whilst patients made more errors on the SOPT overall, they were no more likely to perseverate than controls. Patients' erroneous responses did not proliferate across trials, suggesting that proactive interference did not contribute to their poor performance, but serial position effects were evident where patients' errors clustered towards the end of a trial. No differences were found on the recognition memory test, in WM capacity, or on two of the three traditional executive procedures (FAS and Trail-Making). However, patients' Digits Backwards was impaired.
    Conclusions: These data suggest that patients with BD have a deficit in their ability to monitor the contents of WM. This deficit is not an epiphenomenon of mood, but may be due to enduring brain dysfunction, integral to bipolar illness.
    MeSH term(s) Adult ; Affect ; Bipolar Disorder/drug therapy ; Bipolar Disorder/epidemiology ; Demography ; Depression/diagnosis ; Depression/epidemiology ; Diagnostic and Statistical Manual of Mental Disorders ; Female ; Humans ; Hydrocortisone/analysis ; Male ; Memory Disorders/diagnosis ; Memory Disorders/epidemiology ; Memory, Short-Term ; Neuropsychological Tests ; Prospective Studies ; Psychotropic Drugs/therapeutic use ; Recognition (Psychology) ; Saliva/chemistry ; Surveys and Questionnaires
    Chemical Substances Psychotropic Drugs ; Hydrocortisone (WI4X0X7BPJ)
    Language English
    Publishing date 2007-08
    Publishing country Denmark
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472242-2
    ISSN 1399-5618 ; 1398-5647
    ISSN (online) 1399-5618
    ISSN 1398-5647
    DOI 10.1111/j.1399-5618.2007.00470.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Executive and visuospatial sketchpad resources in euthymic bipolar disorder: Implications for visuospatial working memory architecture.

    Thompson, Jill M / Hamilton, C J / Gray, John M / Quinn, J G / Mackin, Paul / Young, Allan H / Ferrier, I Nicol

    Memory (Hove, England)

    2006  Volume 14, Issue 4, Page(s) 437–451

    Abstract: Visuospatial working memory theory is used to interpret the cognitive impairment in euthymic bipolar disorder. Such patients show deficits in the Corsi Blocks Test (CBT) and executive control. To understand these deficits, 20 euthymic bipolar patients ... ...

    Abstract Visuospatial working memory theory is used to interpret the cognitive impairment in euthymic bipolar disorder. Such patients show deficits in the Corsi Blocks Test (CBT) and executive control. To understand these deficits, 20 euthymic bipolar patients and controls were administered the CBT, Visual Patterns Test (VPT), and a new visual memory task designed to make minimal demands on executive resources. Initial analyses validated the visual memory task and implicated executive involvement in the CBT and VPT. Subsequent analyses on a number of tests confirmed CBT and executive deficits while performance was normal on the VPT and visual memory test. ANCOVA indicated that impaired executive function underpinned patients' CBT performance. Implications for the interface between executive and slave systems of working memory are discussed.
    MeSH term(s) Adolescent ; Adult ; Analysis of Variance ; Bipolar Disorder/psychology ; Cognition ; Cognition Disorders/psychology ; Female ; Humans ; Judgment ; Male ; Memory, Short-Term ; Models, Psychological ; Psychological Tests ; Space Perception ; Visual Perception
    Language English
    Publishing date 2006-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1147478-6
    ISSN 1464-0686 ; 0965-8211
    ISSN (online) 1464-0686
    ISSN 0965-8211
    DOI 10.1080/09658210500464293
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top