Plasmon-induced coherence, exciton-induced transparency, and Fano interference for hybrid plasmonic systems in strong coupling regime.

We present an analytical model describing the transition to a strong coupling regime for an ensemble of emitters resonantly coupled to a localized surface plasmon in a metal-dielectric structure. The response of a hybrid system to an external field is determined by two distinct mechanisms involving collective states of emitters interacting with the plasmon mode. The first mechanism is the near-field coupling between the bright collective state and the plasmon mode, which underpins the energy exchange between the system components and gives rise to exciton-induced transparency minimum in scattering spectra in the weak coupling regime and to emergence of polaritonic bands as the system transitions to the strong coupling regime. The second mechanism is the Fano interference between the plasmon dipole moment and the plasmon-induced dipole moment of the bright collective state as the hybrid system interacts with the radiation field. The latter mechanism is greatly facilitated by plasmon-induced coherence in a system with the characteristic size below the diffraction limit as the individual emitters comprising the collective state are driven by the same alternating plasmon near field and, therefore, all oscillate in phase. This cooperative effect leads to scaling of the Fano asymmetry parameter and of the Fano function amplitude with the ensemble size, and therefore, it strongly affects the shape of scattering spectra for large ensembles. Specifically, with increasing emitter numbers, the Fano interference leads to a spectral weight shift toward the lower energy polaritonic band.

The impact and experience of debriefing for clinical staff following traumatic events in clinical settings: A systematic review.

Health care professionals are more frequently exposed to potentially traumatic events than individuals in other professions. Repeated trauma exposure can significantly impact both physical and mental health. In clinical settings, the term "debriefing" refers to a group meeting during which clinical events and decision-making are reviewed and discussed to improve clinical practice. The present review investigated the use of debriefing for clinical staff in clinical settings following exposure to direct and vicarious trauma. We examined whether the use of posttrauma debriefing impacts symptoms of distress and explored how clinical staff experience debriefing; we also investigated the factors that influence this experience. A systematic search of five electronic databases was conducted between August 31 and September 2, 2019. Included articles (N = 13) described the use of debriefing in clinical settings with clinical staff following a traumatic event. We assessed methodological quality and performed a narrative synthesis. Four studies found some evidence of the benefits of debriefing for reducing psychological sequelae to traumatic events. Seven studies commented on factors that clinical staff perceived to be important for the debriefing to feel helpful, including the being given the opportunity for reflection, gaining a shared experience, and having the right peer facilitator. Some evidence suggests that debriefing with staff working in clinical settings can reduce posttraumatic distress symptoms, and subjective evidence suggests that clinical staff members perceive debriefing to be useful. Due to the limited literature, no firm conclusions could be drawn, and further methodologically sound research is required.

Factors associated with secondary traumatic stress and burnout in neonatal care staff: A cross-sectional survey study.

INTRODUCTION: High rates of secondary traumatic stress and burnout have been found across nursing populations. However, few studies have focused on neonatal staff. OBJECTIVE: The objectives of this article are to explore the prevalence and severity of secondary traumatic stress (STS) and burnout in neonatal staff, and identify risk factors and protective factors for STS and burnout within this population with the aim of informing future staff support. METHODS: A quantitative, cross-sectional study using a survey design was conducted; 246 neonatal staff reported measures of STS, burnout, self-compassion and satisfaction with ward climate. RESULTS: Neonatal staff reported high rates of moderate-severe STS and burnout. STS and burnout were negatively associated with self-compassion and satisfaction with ward climate, suggesting them to be protective factors against STS and burnout. STS was found to be a risk factor for burnout and vice versa. CONCLUSION: Interventions that increase understanding of STS and burnout, nurture self-compassion, provide support and enhance stress management could help mitigate the impact of STS and burnout amongst neonatal staff.

Genetic variation in Breviolum antillogorgium, a coral reef symbiont, in response to temperature and nutrients.

Symbionts within the family Symbiodiniaceae are important on coral reefs because they provide significant amounts of carbon to many different reef species. The breakdown of this mutualism that occurs as a result of increasingly warmer ocean temperatures is a major threat to coral reef ecosystems globally. Recombination during sexual reproduction and high rates of somatic mutation can lead to increased genetic variation within symbiont species, which may provide the fuel for natural selection and adaptation. However, few studies have asked whether such variation in functional traits exists within these symbionts. We used several genotypes of two closely related species, Breviolum antillogorgium and B. minutum, to examine variation of traits related to symbiosis in response to increases in temperature or nitrogen availability in laboratory cultures. We found significant genetic variation within and among symbiont species in chlorophyll content, photosynthetic efficiency, and growth rate. Two genotypes showed decreases in traits in response to increased temperatures predicted by climate change, but one genotype responded positively. Similarly, some genotypes within a species responded positively to high-nitrogen environments, such as those expected within hosts or eutrophication associated with global change, while other genotypes in the same species responded negatively, suggesting context-dependency in the strength of mutualism. Such variation in traits implies that there is potential for natural selection on symbionts in response to temperature and nutrients, which could confer an adaptive advantage to the holobiont.