Non-enzymatic glucose sensing using a nickel hydroxide/chitosan modified screen-printed electrode incorporated into a flow injection analysis system.

This works presents a novel screen-printed carbon electrode modified with nickel hydroxide nanoparticles and chitosan (Ni(OH)2/CS/SPCE) for the non-enzymatic flow injection amperometric detection of glucose. The electrode was modified by drop-casting a suspension of the synthesised nanocomposite onto the screen-printed electrode and dried for 1 hour at room temperature. EDX analysis was used to investigate the chemical composition of the electrode before and after modifying. The electrochemical response of the unmodified SPCE and modified electrode was initially investigated by cyclic voltammetry (CV) using 0.1 M NaOH as the supporting electrolyte. CVs showed catalytic activity for glucose oxidation using the Ni(OH)2/CS/SPCE at 0.55 V. During flow injection analysis (FIA), 0.60 V and 1.5 mL min-1 were identified as the optimal potential and flow rate, respectively. A wide linear range of detection was observed (0.2 to 10.0 mM) with a sensitivity and limit of detection of 913 µA mM-1 cm-2 and 0.0174 mM, respectively. The modified electrode also displayed excellent repeatability (RSD = 0.47%, n = 20) and good reproducibility (RSD = 2.52%, n = 6). The modified electrode was shown to be very selectivity for glucose over other interferences commonly found in human blood samples. The practicality of the developed flow injection-amperometric system (FIA-Amp) was validated by the quantification of glucose in real serum samples, where results were in close agreement with those obtained from the local hospital.

Enhanced Monitoring of Photocatalytic Reactive Oxygen Species: Using Electrochemistry for Rapid Sensing of Hydroxyl Radicals Formed during the Degradation of Coumarin.

Many recent research studies have reported indirect methods for the detection and quantification of OH radicals generated during photocatalysis. The short lifespan and high reactivity of these radicals make indirect detection using probes such as coumarin a more viable quantification method. Hydroxyl radical production is commonly monitored using fluorescence spectroscopy to determine the concentration of the compound 7-hydroxycoumarin, which is formed from hydroxyl radical attack on coumarin. There are, however, a number of additional hydroxylated coumarins generated during this process, which are less amenable to detection by fluorescence spectroscopy. Consequently, limitations and inaccuracies of this method have previously been reported in the literature. As an alternative approach to those previously reported, this work has developed an electrochemical screening method using coumarin as a OH radical trap, that is capable of in situ monitoring of not only 7-hydroxycoumarin, but all the main mono-hydroxylated products formed. As a result, this technique is a more representative and comprehensive method for the quantification of OH radicals produced by photocatalysts using coumarin as a probe molecule. Moreover, the electroanalytical method provides a portable, rapid, sensitive, and accurate in situ method for the monitoring of OH radical formation without the need for sample preparation.

Electrochemical flow injection analysis for the rapid determination of reducing sugars in potatoes.

Non-enzymatic electrochemical sensors for the monitoring of reducing sugars in foods has great potential as a rapid in-situ detection method. This development involved the assembly of a nanoporous platinum structure on a screen-printed carbon electrode (SPCE). The modified electrode was then employed as an amperometric sensing element in a flow injection analysis (FIA) manifold. The system was successfully applied to the rapid detection of reducing sugars in potatoes, without the need for sample preparation. Optimal signals were achieved in phosphate buffer (pH 7.4) at a flow rate of 0.5 mL min-1 and an applied potential of 0.6 V. Experimental results demonstrated the sensor's long-term stability and high selectivity for reducing sugars. This method provides high sample throughput due to a rapid response time of less than five seconds. Reducing sugar values determined were in good agreement with those recorded using a commercially available enzymatic assay kit.

Prospective Patterns of Help-Seeking Behavior Among Military Veterans With Probable Posttraumatic Stress Disorder and Major Depressive Disorder.

This study examined help-seeking behavior from professional, informal, and religious sources in veterans with a probable need for treatment. In total, 93 veterans who screened positive for posttraumatic stress disorder/major depressive disorder completed assessments of help-seeking at two time points spaced apart by 6 months. Less than half (40%) reached out to a mental health professional or physician; only 1 in 10 engaged with providers who specialize in evidence-based therapies to a minimally adequate degree. Although roughly two thirds pursued help from informal sources, less than 10% similarly sought help nine or more times. Veterans with high willingness to seek help from specific sources at baseline were more likely to report sustained engagement in help-seeking behavior along these same lines at follow-up. Assessing veterans' help-seeking intentions may add prognostic value in predicting engagement in services. Veterans may also benefit from tailoring service delivery models according to preferred sources of help in their families and communities.

A Qualitative Examination of VA Chaplains' Understandings and Interventions Related to Moral Injury in Military Veterans.

This study examines VA chaplains' understandings of moral injury (MI) and preferred intervention strategies. Drawing qualitative responses with a nationally-representative sample, content analyses indicated that chaplains' definitions of MI comprised three higher order clusters: (1) MI events, (2) mechanisms in development of MI, and (3) warning signs of MI. Similarly, chaplains' intervention foci could be grouped into three categories: (1) pastoral/therapeutic presence, (2) implementing specific interventions, and (3) therapeutic processes to promote moral repair. Findings are discussed related to emerging conceptualizations of MI, efforts to adapt existing evidence-based interventions to better address MI, and the potential benefits of better integrating chaplains into VA mental health service delivery.

Exploring cross-lagged associations between spiritual struggles and risk for suicidal behavior in a community sample of military veterans.

BACKGROUND: There is consensus that struggles with religious faith and/or spirituality likely contribute to risk for suicidal behavior in military populations. However, a lack of longitudinal information has limited the ability to clarify the temporal associations between these variables. METHODS: This study examined cross-lagged associations between key types of spiritual struggles (divine, morality, ultimate meaning, interpersonal relations, and doubting) and indices of risk for suicidal behavior (suicidal ideation and probability of future attempt) in a community sample of veterans who completed assessments spaced apart by six months. RESULTS: Greater severity of all forms of spiritual struggles was generally concurrently associated with indices of suicidal behavior at both time points. Of the possible models for predicting suicide risk, structural equation modeling analyses revealed that a cross-lagged option with spiritual struggles predicting risk provided the best-fitting solution for veterans' responses on study measures. In addition to PTSD and MDD symptomatology, issues with ultimate meaning at Time 1 were uniquely predictive of veterans' perceived likelihood of making a suicide attempt beyond the second assessment, after accounting for autoregressive effects and other variables in this model. LIMITATIONS: This sample was recruited from a single geographic region with disproportionate ties to Christian religious traditions. In addition, reliance on self-report instrumentation potentially limited the accuracy of gauging suicide risk in some cases. CONCLUSIONS: Findings highlight the prognostic value of spiritually integrated models for assessing suicide risk in military veterans that account for mental health conditions along with possible expressions of suffering in the spiritual domain.

Mental health treatment-related stigma and professional help seeking among student veterans.

Record numbers of military veterans are enrolling at colleges/universities across the United States. Although a substantive subset might suffer from mental health problems, the majority of these students might not be amenable to utilizing services. The purpose of this study was to examine the role of treatment-related stigma in intentions to seek professional help among undergraduate student veterans at a university on the U.S. Gulf Coast. Focusing on 251 veterans and a gender-matched comparison group of 251 nonveterans, student veterans endorsed higher probabilities of seeking care from physicians (d = .77) and psychologists or other professionals (d = .67). In addition, nonveteran students had greater self-stigma about seeking help (d = -.27) but veterans had more negative beliefs about treatment efficacy (d = 1.07). When compared with veterans who did not exceed clinical thresholds, those with a probable need for treatment had more stigma (ds = .63). Multivariate analyses also revealed an inverse main effect of self-stigma on intentions to seek help from both professional categories. However, military experience differentially moderated associations between treatment-related beliefs and intentions to seek mental health services. Finally, exploratory analyses identified that student veterans were most likely to engage in therapy/counseling at a Veterans Affairs Medical Center or Clinic, Vet Center, or other noninstitutionally sponsored settings in the community (e.g., private practices, faith-based organizations). Looking ahead, these findings will inform research and the provision of services for addressing the mental health needs of this substantive subpopulation of college students in the United States. (PsycINFO Database Record

Theodicies and professional quality of life in a nationally representative sample of chaplains in the veterans' health administration.

This study examined the role of theodicies or theological/philosophic attempts to resolve existential dilemmas related to evil and human suffering in chaplains' professional quality of life (ProQOL). A nationally representative sample of 298 VHA chaplains completed the recently developed Views of Suffering Scale (Hale-Smith, Park, & Edmondson, 2012 ) and ProQOL-5 (Stamm, 2010 ). Descriptive results revealed that 20-50% endorsed strong theistic beliefs in a compassionate deity who reciprocally suffers with hurting people, God ultimately being responsible for suffering, and that suffering can provide opportunities for intimate encounters with God and personal growth. Other results indicated that chaplains' beliefs about human suffering were differentially linked with their sense of enjoyment/purpose in working with veterans. These results suggest that theodicies might serve as a pathway to resilience for individuals in spiritual communities and traditions in USA, particularly for clinicians and ministry professionals who are committed to serving the needs of traumatized persons.

Professional Quality of Life and Changes in Spirituality Among VHA Chaplains: A Mixed Methods Investigation.

A mixed method design was implemented to examine the spirituality and emotional well-being of Veterans Health Administration (VHA) chaplains and how potential changes in spirituality and emotional well-being may affect their professional quality of life. Four distinct categories of changes emerged from the narrative statements of a nationally representative sample of 267 VHA chaplains: (1) positive changes (e.g., increased empathy), (2) negative changes (e.g., dysthymic mood, questioning religious beliefs), (3) combination of positive and negative changes, and (4) no change (e.g., sustenance through spirituality or self-care). Most chaplains reported positive (37%) or no change (30%) in their spirituality and/or emotional well-being. However, quantitative analyses revealed that chaplains who reported negative changes endorsed greater burnout and secondary traumatic stress. Overall, these findings suggest VHA chaplains are predominantly spiritually resilient, but negative changes in the spiritual domain can occur, potentially increasing the risk of adverse changes in professional quality of life.

Adverse childhood experiences and risk for suicidal behavior in male Iraq and Afghanistan veterans seeking PTSD treatment.

OBJECTIVE: Adverse childhood experiences (ACEs) are associated with increased risk for suicide and appear to occur in disproportionately high rates among men who served in the U.S. military. However, research has yet to examine a comprehensive range of ACEs among Iraq/Afghanistan veterans with combat-related posttraumatic stress disorder (PTSD) or whether these premilitary stressors may contribute to suicidal behavior in this highly vulnerable population. METHOD: A sample of 217 men entering a residential program for combat-related PTSD completed measures for ACEs, combat exposure, and lifetime suicidal ideation and attempts. RESULTS: The majority of patients had experienced multiple types of adversity or traumas during childhood/adolescence. In particular, 83.4% endorsed at least 1 ACE category and 41.5% reported experiencing 4 or more ACEs. When accounting for effects of deployment-related stressors, we further found that accumulation of ACEs was uniquely linked with thoughts of suicide or attempts among these patients. Namely, for every 1-point increase on the ACE Questionnaire, veterans' risk of suicidal ideation and attempts increased by 23% and 24%, respectively. CONCLUSION: This brief report provides initial evidence that veterans seeking treatment for combat-related PTSD often have extensive histories of premilitary stressors that may increase suicide risk beyond probable deployment-related traumas. (PsycINFO Database Record