The genetic and molecular basis of flagellar motility has been investigated for several decades, with innovative research strategies propelling advances at a steady pace. Furthermore, as the ...phenomenon is examined in diverse bacteria, new taxon-specific regulatory and structural features are being elucidated. Motility is also a straightforward bacterial phenotype that can allow undergraduate researchers to explore the palette of molecular genetic tools available to microbiologists. This study, driven primarily by undergraduate researchers, evaluated hundreds of flagellar motility mutants in the Gram-negative plant-associated bacterium Agrobacterium fabrum. The nearly saturating screen implicates a total of 37 genes in flagellar biosynthesis, including genes of previously unknown function.
The effects of traumatic brain injury (TBI) incurred during military service are widely studied; however, less is known about TBI resulting from intimate partner violence (“IPV-related TBI”). Women ...Veterans are at high risk for IPV, yet no research has examined future psychosocial health risks associated with IPV-related TBI history in this population.
We examined psychiatric and physical health outcomes, as well as IPV, in a sample of women Veterans who, at Time 1, reported IPV-related TBI with (n = 13) or without (n = 20) persistent symptoms; that is, symptoms such as memory problems, balance problems or dizziness, sensitivity to bright light, irritability, headaches, and sleep problems that began or got worse immediately following the IPV-related TBI and occurred within the past week. These women completed web-based surveys 18 months later (Time 2), which included validated measures of psychiatric and physical health symptoms as well as past-year IPV. We conducted linear regressions to model whether T1 IPV-related TBI with persistent symptoms predicted worse health outcomes at T2, in comparison to T1 IPV-related without persistent symptoms.
Controlling for significant covariates (i.e., military sexual trauma; MST), IPV-related TBI with persistent symptoms at Time 1 was associated with significantly worse outcomes at Time 2 across all health outcome domains (sr2 range: 0.12–0.37). After controlling for MST and probable posttraumatic stress disorder (PTSD) at Time 1, IPV-related TBI with persistent symptoms at Time 1 remained significantly associated with worse Time 2 symptoms of insomnia, depression, and physical health (sr2 range: 0.12–0.25).
Women who experience IPV-related TBI with persistent symptoms are at higher risk for worse psychosocial health outcomes 18 months later. Findings necessitate screening IPV survivors for TBI with persistent symptoms and tailoring TBI and psychosocial interventions to reduce risk for ongoing health sequelae.
•IPV-related TBI with persistent symptoms is associated with worse future health.•Sleep, depression, and physical health remain worse when accounting for PTSD.•Women with IPV-related TBI with persistent symptoms have more past-year IPV.
Whereas some prior studies have assessed associations between general self‐efficacy, intimate partner violence (IPV) experiences, and posttraumatic stress disorder (PTSD) symptoms cross‐sectionally, ...there is limited research investigating the potential directions of these effects or the longitudinal effects over multiple assessment points. We investigated the role of general self‐efficacy in experiences of IPV and PTSD symptoms across time among 411 women veterans of the U.S. Armed Forces. Online survey data were collected at baseline (Time 1; T1), 18 months after baseline (Time 2; T2), and 2 years after baseline (Time 3; T3). Structural equation models were used to test hypotheses that T2 general self‐efficacy would mediate reciprocal associations between IPV experiences and PTSD symptoms while controlling for T2 IPV experiences, T1 PTSD symptoms, and demographic and military covariates (i.e., age, military sexual trauma, and combat exposure). Specifically, we hypothesized that T2 general self‐efficacy would mediate the association between (a) T1 IPV experiences and T3 IPV experiences, (b) T1 IPV experiences and T3 PTSD symptoms, (c) T1 PTSD symptoms and T3 IPV experiences, and (d) T1 PTSD symptoms and T3 PTSD symptoms. Findings revealed that T1 PTSD symptoms predicted lower T2 general self‐efficacy, and, in turn, lower T2 general self‐efficacy was associated with higher T3 IPV experiences, 95% CI 0.06, 0.41; no other hypotheses were supported. The findings speak to the importance of clinical interventions which promote general self‐efficacy as well as assess and treat PTSD symptoms among women who experience IPV.
At least 3 million Americans sustain a mild traumatic brain injury (mTBI) each year, and 1 in 5 have symptoms that persist beyond 1 month. Standards of mTBI care have evolved rapidly, with numerous ...expert consensus statements and clinical practice guidelines published in the last 5 years. This Special Communication synthesizes recent expert consensus statements and evidenced-based clinical practice guidelines for civilians, athletes, military, and pediatric populations for clinicians practicing outside of specialty mTBI clinics, including primary care providers. The article offers guidance on key clinical decisions in mTBI care and highlights priority interventions that can be initiated in primary care to prevent chronicity.
Abstract Objective To effectively diagnose and treat women who have experienced intimate partner violence (IPV), it is important to identify the full range of physical and mental health consequences, ...including hidden wounds such as traumatic brain injury (TBI) and posttraumatic stress disorder (PTSD). We aimed to identify the occurrence of IPV-related TBI and associated PTSD symptoms among women veterans who experienced IPV. Methods A web-based survey was administered in 2014 to a national sample of U.S. women veterans. Among 411 respondents (75% participation rate), 55% reported IPV during their lives. These participants (N = 224) completed screening measures of IPV-related TBI, PTSD, and past-year IPV and comprised the current sample. Results A total of 28.1% (n = 63) met criteria for IPV-related TBI history, and 12.5% (n = 28) met criteria for IPV-related TBI with current symptoms. When adjusting for race, income, and past-year IPV, women with IPV-related TBI with current symptoms were 5.9 times more likely to have probable IPV-related PTSD than those with no IPV-related TBI history. Despite symptom overlap between TBI and PTSD, women with IPV-related TBI with current symptoms were significantly more likely to meet criteria for all four DSM- 5 PTSD symptom clusters compared to women with an IPV-related TBI history without current symptoms (Cramér's V′s = .34–.42). Conclusion Findings suggest there may be clinical utility in screening women who experience lifetime IPV for both TBI and PTSD symptoms in order to help clinicians better target their examinations, treatment, and referrals.
Background
Little is known about women veterans’ intimate partner violence (IPV) experiences during the COVID-19 pandemic or the impacts of pandemic-related stress on their mental and physical ...health.
Objectives
To identify IPV experiences among women veterans prior to and during the pandemic, pandemic-related stressors, and examine their respective contributions to mental and physical health.
Design
National sample of women veterans drawn from a larger web-based longitudinal study. Relationships between recent IPV and pandemic-related stressors were tested with linear regressions, controlling for pre-pandemic IPV and mental and physical health symptoms, demographic, and military-related covariates.
Participants
One hundred forty-two women veterans (
M
age
=58.8 years).
Main Measures
We assessed IPV (CTS-2), PTSD (PCL-5), depression (CESD), anxiety (DASS-A), physical health (PHQ-15), and physical health–related quality of life (SF-12) prior to the pandemic (June 2016–December 2016/January 2017) and during the pandemic study period (March 2020–December 2020/January 2021). We assessed pandemic-related stressors (EPII) during the pandemic study period.
Key Results
Over a third (38.7%) of participants experienced IPV during the pandemic study period (psychological: 35.9%, physical: 9.9%, sexual: 4.2%). Overall rates, frequency, and severity of IPV experience did not significantly differ between the pre-pandemic and pandemic study periods. Few participants tested positive for COVID-19 (4.2%); however, most participants reported experiencing pandemic-related stressors across life domains (e.g., social activities: 88%, physical health: 80.3%, emotional health: 68.3%). IPV during the pandemic and pandemic-related stressors were both associated with greater PTSD and depressive symptoms. Pandemic-related stressors were associated with worse anxiety and physical health symptoms. Neither IPV during the pandemic nor pandemic-related stressors were associated with physical health–related quality of life.
Conclusions
IPV experiences during the pandemic were common among women veterans, as were pandemic-related stressors. Although IPV did not increase in the context of COVID-19, IPV experiences during the pandemic and pandemic-related stressors were linked with poorer mental and physical health.
To standardize the preprocedure process for urgent, unscheduled cesarean deliveries to decrease the time from decision to skin incision to improve maternal and fetal outcomes.
In our ...quality-improvement project, we selected indications that require urgent cesarean deliveries, created a standard algorithm, then implemented a multidisciplinary process intended to reduce decision-to-incision time. This initiative was conducted from May 2019 to May 2021, with a preimplementation period from May 2019 to November 2019 (n=199), implementation period from December 2019 to September 2020 (n=283), and postimplementation period from October 2020 to May 2021 (n=160). An interrupted time series calculation was performed, with stratification by patient race and ethnicity. The primary process measure was mean decision-to-incision time. The secondary outcomes were neonatal status as measured by 5-minute Apgar score and quantitative blood loss during the cesarean delivery.
We analyzed 642 urgent cesarean deliveries; 199 were preimplementation of the standard algorithm, and 160 were postimplementation. The mean decision-to-incision time improved from 88 minutes (95% CI 75-101 min) to 50 minutes (95% CI 47-53 min) from the preimplementation period to the postimplementation period. When stratified by race and ethnicity, the mean decision-to-incision time among Black non-Hispanic patients improved from 98 minutes (95% CI 73-123 min) to 50 minutes (95% CI 45-55 min) (t=3.27, P <.01); it improved from 84 minutes (95% CI 66-103 min) to 49 minutes (95% CI 44-55 min) among Hispanic patients (t=3.51, P <.001). There was no significant improvement in decision-to-incision time among patients in other racial and ethnic groups. When the cesarean delivery was performed for fetal indications, Apgar scores were significantly higher in the postimplementation period compared with the preimplementation period (8.5 vs 8.8 beta=0.29, P <.01).
Development and implementation of a standard algorithm to expedite decision-to-incision time for unscheduled, urgent cesarean deliveries led to a significant decrease in decision-to-incision time.
Context
There is great interest in land management practices for pollinators; however, a quantitative comparison of landscape and local effects on bee communities is necessary to determine if adding ...small habitat patches can increase bee abundance or species richness. The value of increasing floral abundance at a site is undoubtedly influenced by the phenology and magnitude of floral resources in the landscape, but due to the complexity of measuring landscape-scale resources, these factors have been understudied.
Objectives
To address this knowledge gap, we quantified the relative importance of local versus landscape scale resources for bee communities, identified the most important metrics of local and landscape quality, and evaluated how these relationships vary with season.
Methods
We studied season-specific relationships between local and landscape quality and wild-bee communities at 33 sites in the Finger Lakes region of New York, USA. We paired site surveys of wild bees, plants, and soil characteristics with a multi-dimensional assessment of landscape composition, configuration, insecticide toxic load, and a spatio-temporal evaluation of floral resources at local and landscape scales.
Results
We found that the most relevant spatial scale and landscape factor varied by season. Early-season bee communities responded primarily to landscape resources, including the presence of flowering trees and wetland habitats. In contrast, mid to late-season bee communities were more influenced by local conditions, though bee diversity was negatively impacted when sites were embedded in highly agricultural landscapes. Soil composition had complex impacts on bee communities, and likely reflects effects on plant community flowering.
Conclusions
Early-season bees can be supported by adding flowering trees and wetlands, while mid to late-season bees can be supported by local addition of summer and fall flowering plants. Sites embedded in landscapes with a greater proportion of natural areas will host a greater bee species diversity.
•Empowerment reduces PTSD symptoms for women experiencing psychological IPV•Empowerment reduces IPV revictimization among physical/sexual IPV victims.•PTSD symptoms increase IPV revictimization for ...psychological IPV victims.•Empowerment may enhance safety and well-being among women who experience IPV.
Empowerment is associated with lower posttraumatic stress disorder (PTSD) symptoms and intimate partner violence (IPV) revictimization, but the direction of these associations remains unknown. Two models were assessed: one in which empowerment is protective against future IPV revictimization and PTSD symptoms, and one in which PTSD symptoms lead to reductions in empowerment and increases in IPV revictimization. Drawn from a probability-based access survey panel of U.S. adults, the present sample included 101 women veterans who experienced past-year IPV. Baseline demographics were assessed (T0), with surveys conducted at Time 1 (T1; 18-month interim), and Time 2 (T2; 6-month interim). Cross-lagged panel models assessed the two models separately among women who reported only T1 psychological IPV victimization (58%) and women who reported T1 physical and/or sexual IPV victimization. Among psychological IPV victims, T1 empowerment was significantly associated with decreased T2 PTSD symptoms, whereas among women who reported physical and/or sexual IPV victimization, T1 empowerment was significantly associated with decreased T2 IPV revictimization. The model in which PTSD symptoms confer risk for lower empowerment was not supported; however, higher T1 PTSD symptoms were associated with increased IPV revictimization among women who reported psychological IPV only. Findings can inform interventions for IPV survivors.
Climate change can influence interspecific interactions by differentially affecting species‐specific phenology. In seasonal ice environments, there is evidence that polar bear predation of Arctic ...bird eggs is increasing because of earlier sea ice breakup, which forces polar bears into nearshore terrestrial environments where Arctic birds are nesting. Because polar bears can consume a large number of nests before becoming satiated, and because they can swim between island colonies, they could have dramatic influences on seabird and sea duck reproductive success. However, it is unclear whether nest foraging can provide an energetic benefit to polar bear populations, especially given the capacity of bird populations to redistribute in response to increasing predation pressure. In this study, we develop a spatially explicit agent‐based model of the predator–prey relationship between polar bears and common eiders, a common and culturally important bird species for northern peoples. Our model is composed of two types of agents (polar bear agents and common eider hen agents) whose movements and decision heuristics are based on species‐specific bioenergetic and behavioral ecological principles, and are influenced by historical and extrapolated sea ice conditions. Our model reproduces empirical findings that polar bear predation of bird nests is increasing and predicts an accelerating relationship between advancing ice breakup dates and the number of nests depredated. Despite increases in nest predation, our model predicts that polar bear body condition during the ice‐free period will continue to decline. Finally, our model predicts that common eider nests will become more dispersed and will move closer to the mainland in response to increasing predation, possibly increasing their exposure to land‐based predators and influencing the livelihood of local people that collect eider eggs and down. These results show that predator–prey interactions can have nonlinear responses to changes in climate and provides important predictions of ecological change in Arctic ecosystems.
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