Posttraumatic Stress and Depressive Symptoms and Symptom Clusters in US Military Personnel: The Longitudinal Effects of General Self-Efficacy and Meaning in Life

Indiana University-Purdue University Indianapolis (IUPUI)US military personnel often experience ongoing distress after being exposed to traumatic events, and many develop posttraumatic stress disorder (PTSD) and major depressive disorder (MDD). Both general theories of stress and coping and cognitive theories of PTSD suggest that traumatic events give rise to distress by negatively influencing important beliefs and goals related to the self, other people, and the world. According to these theories, more positive belief- and goal-systems are associated with less severe symptoms of distress. Two constructs that tap into these systems are general self-efficacy and subjective meaning in life. The overall goal of the current study was to examine the ways general self-efficacy and subjective meaning in life relate to posttraumatic stress and depressive symptoms and symptom clusters in US military personnel, both cross-sectionally and longitudinally. Data from a VA-funded intervention study (n = 191) were examined. Results demonstrated that meaning in life is consistently associated with posttraumatic stress and depressive symptoms and symptom clusters cross-sectionally, whereas general self-efficacy is only associated with some aspects of depressive symptoms. Longitudinal analyses further revealed that meaning in life is associated with the Cluster D symptoms of PTSD and the cognitive-affective symptoms of depression. Interpretations, possible explanations, implications, and future directions are provided. Continued research in this area may identify important targets for treatment that enhance ongoing efforts to facilitate recovery from trauma

New constraints on equatorial temperatures during a Late Neoproterozoic snowball Earth glaciation

Intense glaciation during the end of Cryogenian time (∼635 million years ago) marks the coldest climate state in Earth history – a time when glacial deposits accumulated at low, tropical paleolatitudes. The leading idea to explain these deposits, the snowball Earth hypothesis, predicts globally frozen surface conditions and subfreezing temperatures, with global climate models placing surface temperatures in the tropics between −20 °C and −60 °C. However, precise paleosurface temperatures based upon geologic constraints have remained elusive and the global severity of the glaciation undetermined. Here we make new geologic observations of tropical periglacial, aeolian and fluvial sedimentary structures formed during the end-Cryogenian, Marinoan glaciation in South Australia; these observations allow us to constrain ancient surface temperatures. We find periglacial sand wedges and associated deformation suggest that ground temperatures were sufficiently warm to allow for ductile deformation of a sandy regolith. The wide range of deformation structures likely indicate the presence of a paleoactive layer that penetrated 2–4 m below the ground surface. These observations, paired with a model of ground temperature forced by solar insolation, constrain the local mean annual surface temperature to within a few degrees of freezing. This temperature constraint matches well with our observations of fluvial deposits, which require temperatures sufficiently warm for surface runoff. Although this estimate coincides with one of the coldest near sea-level tropical temperatures in Earth history, if these structures represent peak Marinaon glacial conditions, they do not support the persistent deep freeze of the snowball Earth hypothesis. Rather, surface temperatures near 0 °C allow for regions of seasonal surface melting, atmosphere–ocean coupling and possible tropical refugia for early metazoans. If instead these structures formed during glacial onset or deglaciation, then they have implications for the timescale and character for the transition into or out of a snowball state

GIWAXS Characterization of Metal–Organic Framework Thin Films and Heterostructures: Quantifying Structure and Orientation

For optoelectronic applications of metal–organic framework (MOF) thin films, it is important to be able to fabricate films and heterostructures that are highly oriented relative to the substrate\u27s surface normal. However, process optimization to achieve this is difficult without sufficiently detailed structural characterization of the deposited films. It is demonstrated that 2D grazing-incidence wide-angle X-ray scattering (GIWAXS) data from a laboratory system go a long way to providing such characterization and can 1) better test structural models than 1D scans, 2) provide a quantitative estimate—useful for process optimization—of the fraction of the deposited film that has the desired surface-oriented texture (2D powder), and 3) deliver such information as a function of depth into the film—useful for heterostructure characterization. Herein, GIWAXS data collection and analysis are introduced in the context of understanding MOF thin films, then it is shown how the desired oriented fraction (2D powder fraction) of UiO-66 fabricated by vapor-assisted conversion can be increased from 4% to over 95% by minimizing nucleation in solution. Finally, it is demonstrated that heterostructures of UiO-66 and UiO-67 can be grown wherein both layers are highly ordered (UiO-66 83%, UiO-67 >94%) once synthetic protocols are optimized

Hope, Optimism, and Affect as Predictors and Consequences of Expectancies: The Potential Moderating Roles of Perceived Control and Success

Hope and optimism may be differentially influential depending on the situational context. This study sought to (1) experimentally test whether hope and optimism differentially predict specific expectancies in controllable versus uncontrollable situations and (2) examine the relative impact of specific expectancies on affect when desired outcomes are (or are not) achieved. A 2 × 2 independent samples design was used to experimentally manipulate perceived control and situational outcome (i.e., success or failure). Online participants (N = 571) completed self-report measures of hope and optimism before being randomly assigned to one of four experimental conditions. Results showed that hope, but not optimism, predicted specific expectancies in the perceived control condition. Conversely, optimism, but not hope, predicted specific expectancies in the no perceived control condition. More optimistic specific expectancies of success predicted greater positive affect regardless of success or failure outcome

Well-being of mental health workers during the Russian-Ukrainian War

Introduction: While the detrimental impact of the Russian-Ukrainian War on mental health of Ukrainian population has been well-documented, less attention has been given to mental health workers (MHWs) providing mental health support services amid the war. Purpose: To examine levels of domain-specific well-being in Ukrainian MHWs; identify and quantify the relative importance of factors associated with well-being; and examine interactions of risk and protective factors in relation to each well-being domain. Methodology: A convenience sample of 178 MHWs completed a survey that assessed their well-being, and sociodemographic, war-related, mental health, and psychosocial characteristics. Results:  Lower levels of mental health difficulties such as anxiety and posttraumatic stress symptoms, and higher levels of psychosocial factors such as higher optimism, gratitude, and presence and search for meaning were associated with higher well-being. MHWs with high levels of protective psychosocial factors were more likely to report higher well-being even in the presence of mental health difficulties. Conclusions: Results of this study provide insight into the levels and correlates of multiple well-being domains among Ukrainian MHWs amid the ongoing war. They further suggest that interventions to mitigate mental health difficulties and bolster protective psychosocial factors may help promote well-being in this populatio

Examining Cross-Cultural Relationships Between Meaning in Life and Psychological Well-Being in Turkey and the United States

This study explored the extent to which meaning in life (i.e., presence and search) relates to different aspects of psychological well-being in American and Turkish students. It also assessed whether presence of meaning moderated the relationship between search for meaning and psychological well-being. American (N =377) and Turkish (N =225) undergraduates completed demographics and self-report measures. Simple and moderated moderation analyses were conducted. In both samples, presence and search were negatively associated. In addition, presence of meaning was positively associated with measures of psychological well-being, while search was negatively associated. Presence of meaning buffered the relationship between search for meaning and psychological well-being, but only in the Turkish sample. American and Turkish undergraduates may typically search for meaning when presence of meaning is low. Presence of meaning appears to be adaptive across these two cultures, whereas search for meaning appears to be culturally-specific and may produce differential effects on psychological well-being

BODIPY–pyrene donor–acceptor sensitizers for triplet–triplet annihilation upconversion: the impact of the BODIPY-core on upconversion efficiency

Triplet–triplet annihilation upconversion (TTA-UC) is an important type of optical process with applications in biophotonics, solar energy harvesting and photochemistry. In most of the TTA-UC systems, the formation of triplet excited states takes place via spin–orbital interactions promoted by heavy atoms. Given the crucial role of heavy atoms (especially noble metals, such as Pd and Pt) in promoting intersystem crossing (ISC) and, therefore, in production of UC luminescence, the feasibility of using more readily available and inexpensive sensitizers without heavy atoms remains a challenge. Here, we investigated sensitization of TTA-UC using BODIPY–pyrene heavy-atom-free donor–acceptor dyads with different numbers of alkyl groups in the BODIPY scaffold. The molecules with four and six alkyl groups are unable to sensitize TTA-UC in the investigated solvents (tetrahydrofuran (THF) and dichloromethane (DCM)) due to negligible ISC. In contrast, the dyad with two methyl groups in the BODIPY scaffold and the dyad with unsubstituted BODIPY demonstrate efficient intersystem crossing (ISC) of 49–58%, resulting in TTA-UC with quantum yields of 4.7% and 6.9%, respectively. The analysis of the elementary steps of the TTA-UC process indicates that heavy-atom-free donor–acceptor dyads are less effective than their noble metal counterparts, but may equal them in the future if the right combination of solvent, donor–acceptor sensitizer structure, and new luminescent molecules as TTA-UC emitters can be found

BODIPY–pyrene donor–acceptor sensitizers for triplet–triplet annihilation upconversion: the impact of the BODIPY-core on upconversion efficiency

Triplet–triplet annihilation upconversion (TTA-UC) is an important type of optical process with applications in biophotonics, solar energy harvesting and photochemistry. In most of the TTA-UC systems, the formation of triplet excited states takes place via spin–orbital interactions promoted by heavy atoms. Given the crucial role of heavy atoms (especially noble metals, such as Pd and Pt) in promoting intersystem crossing (ISC) and, therefore, in production of UC luminescence, the feasibility of using more readily available and inexpensive sensitizers without heavy atoms remains a challenge. Here, we investigated sensitization of TTA-UC using BODIPY–pyrene heavy-atom-free donor–acceptor dyads with different numbers of alkyl groups in the BODIPY scaffold. The molecules with four and six alkyl groups are unable to sensitize TTA-UC in the investigated solvents (tetrahydrofuran (THF) and dichloromethane (DCM)) due to negligible ISC. In contrast, the dyad with two methyl groups in the BODIPY scaffold and the dyad with unsubstituted BODIPY demonstrate efficient intersystem crossing (ISC) of 49–58%, resulting in TTA-UC with quantum yields of 4.7% and 6.9%, respectively. The analysis of the elementary steps of the TTA-UC process indicates that heavy-atom-free donor–acceptor dyads are less effective than their noble metal counterparts, but may equal them in the future if the right combination of solvent, donor–acceptor sensitizer structure, and new luminescent molecules as TTA-UC emitters can be found