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The seismic water gun is widely used and plays an important role in seabed imaging acquisition; however, acoustic impacts on marine organisms are currently poorly understood. The aim of this study was to analyse the biochemical responses on the peristomial membrane (PM) of the sea urchin, Arbacia lixula, when exposed to water gun shots in open water. The PM (located around the mouth) is involved in vital functions, such as nutrition and protection. Individuals of sea urchins (n = 7 for each time slot) were sampled before, at the end, and at intervals of 3 h and 24 h after acoustic emission (duration of 20 min). Significant increases in superoxide dismutase, peroxidase, esterase and alkaline were observed immediately after water gun shots, highlighting an increase in the oxidative and inflammatory state of the tissue. Our results showed that acoustic impacts could interfere with PM vital functions, compromising the health, survival and ultimately the conservation of the species. Understanding these effects is crucial to predicting consequences on sea urchin populations and marine ecosystems.

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Our overarching theme for Creative Nursing Volume 30 is The Impact of Social Forces on Nursing and Health. The theme of this current journal issue was originally called Social Violence. In planning this issue, our Editorial Board had to confront head-on the many ways in which overt violence or the threat of violence pervades our lives, as nurses and as individuals. We broadened the title to Consequences and Disruptive Solutions for Social Violence, choosing to focus on what we can do to recognize the interlocking processes that enable, promote, reward, and sustain violent behavior, and to mitigate those effects when and where we can. The sobering content in this issue is the business of each of us. The realities of domestic violence and gun violence, the impact of othering and marginalization, the effects of substance use on family members and of students' experiences of trauma on the school nurses who care for them, and the lethal legacy of unthinking adherence to policies and procedures that is still relevant today-Awareness of this part of our lives and of our practice is where we must start.

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This case report delves into a unique occurrence of MRI-induced headaches attributed to an unsuspected intracranial foreign body. A male patient, presenting persistent headaches, experienced exacerbation of pain upon entering the MRI suite, hindering the imaging procedure. A subsequent head CT scan revealed a nail within the cranial cavity, stemming from a previous nail gun injury. Surgical removal was deemed unsafe, leading to continued observation. This case emphasizes the need for cautious exploration of abnormal symptoms in the MRI suite, urging healthcare professionals to consider potential foreign bodies. The incident underscores the risk of metallic fragments causing complications during MRI procedures and highlights the importance of thorough patient assessment before resorting to MRI imaging.

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Background: Assault weapon and large-capacity magazine bans are potential tools for policy makers to prevent public mass shootings. However, the efficacy of these bans is a continual source of debate. In an earlier study, we estimated the impact of the Federal Assault Weapons Ban (FAWB) on the number of public mass shooting events in the United States. This study provides an updated assessment with 3 additional years of firearm surveillance data to characterize the longer-term effects. Objective: This study aims to estimate the impact of the FAWB on trends in public mass shootings from 1966 to 2022. Methods: We used linear regression to estimate the impact of the FAWB on the 4-year simple moving average of annual public mass shootings, defined by events with 4 or more deaths in 24 hours, not including the perpetrator. The study period spans 1966 to 2022. The model includes indicator variables for both the FAWB period (1995-2004) and the period after its removal (2005-2022). These indicators were interacted with a linear time trend. Estimates were controlled for the national homicide rate. After estimation, the model provided counterfactual estimates of public mass shootings if the FAWB was never imposed and if the FAWB remained in place. Results: The overall upward trajectory in the number of public mass shootings substantially fell while the FAWB was in place. These trends are specific to events in which the perpetrator used an assault weapon or large-capacity magazine. Point estimates suggest the FAWB prevented up to 5 public mass shootings while the ban was active. A continuation of the FAWB and large-capacity magazine ban would have prevented up to 38 public mass shootings, but the CIs become wider as time moves further away from the period of the FAWB. Conclusions: The FAWB, which included a ban on large-capacity magazines, was associated with fewer public mass shooting events, fatalities, and nonfatal gun injuries. Gun control legislation is an important public health tool in the prevention of public mass shootings.

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PURPOSE: This manuscript provides a history of efforts by the American Public Health Association (APHA) Maternal and Child Health Section (MCH Section) Gun Violence Prevention Workgroup (GVP Workgroup) to promote gun violence prevention (GVP) as a key public health priority both within the MCH Section and APHA, and nationally. DESCRIPTION: The MCH Section established a gun violence prevention workgroup in response to the murders of twenty first-grade children and six adults at Sandy Hook Elementary School. This article presents an overview of the accomplishments and challenges of the MCH Section GVP Workgroup in a context of ever-increasing gun violence. As of 2020, firearms became the leading cause of death for U.S. children and teens. ASSESSMENT: Over the past decade, a small group of volunteers helped maintain GVP as one of the top priorities of both the MCH Section and APHA. Endorsement by the MCH Section and APHA leadership facilitated MCH Section GVP Workgroup efforts including organizing a national conference, developing scientific sessions for APHA annual meetings, establishing coalitions, and providing ongoing education and outreach to APHA members. CONCLUSION: The MCH Section GVP Workgroup helped to both elevate and maintain focus on GVP as a top priority of the MCH Section and APHA, indirectly impacting national efforts to promote a public health approach to GVP. The ongoing epidemic of firearm violence highlights the importance of continuing and strengthening this work. Individuals at other national, state or local organizations might look to the efforts and accomplishment of the MCH Section GVP Workgroup in pursuing critical issues within their own organizations.

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Objective: To characterize the sociological risk factors for firearm intimate partner violence (IPV) among women in Texas, with a focus on lethal predictors to aid in screening and intervention guidelines. Methods: A retrospective medical and forensic chart review was conducted and supplemented by news sources, public police reports, and court records on firearm cases in Houston, TX, from 2018 to 2020. IPV was defined as a cis-gendered female victim of firearm violence from a current or ex-intimate partner. Non-IPV was defined as cis-gendered female victims of firearm violence from strangers, friends/acquaintances, gang, client, or similar relationships. Numeric variables were compared using the Wilcoxon rank-sum test and reported as median [Q1, Q3]. Categorical variables were compared using Fisher's exact test and reported as count (%). Results: A total of 102 cases of IPV were identified. Nonspousal IPV was more prevalent than spousal (65.7% versus 34.3%). Lethal injuries, older age, home location, and head injuries were more prevalent in the IPV cohort. Older age, spousal perpetrator, home shooting location, and history of prior domestic abuse were associated with lethal IPV. There were 31 cases of murder-suicide. During the COVID-19 pandemic, IPV cases increased by 91.3%, with lethal cases increasing by 57.6%. Conclusion: Risk factors for overall IPV and lethal IPV are not the same; therefore, it is imperative that all women, irrespective of race, age, or relationship status, be screened for IPV and prior domestic violence to allow intervention and prevention of lethal IPV. Patients should also be screened for personal or partner access to firearms as firearm IPV is a highly lethal form of violence.

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INTRODUCTION: Social vulnerability, race, and place are three important predictors of fatal police shootings. This research offers the first assessment of these factors at the zip code level. METHODS: The 2015-2022 Mapping Police Violence and Washington Post Fatal Force Data (2015-2022) were used and combined with the American Community Survey (2015-2022). The social vulnerability index (SVI) was computed for each zip code by using indicators suggested by CDC, then categorized into low-, medium-, and high-SVI. The analytical file included police officers who fatally shot 6,901 individuals within 32,736 zip codes between 2015-2022. Negative Binomial Regression (NBRG) models were run to estimate the association between number of police shootings and zip code SVI, racial composition, and access to guns using 2015-2022 data. RESULTS: Moving from low-SVI to high-SVI revealed the number of fatal police shootings increased 8.3 times, with the highest increases in Blacks (20.4 times), and Hispanics (27.1 times). The NBRG showed that moderate-, and high-SVI zip codes experienced higher fatal police shootings by 1.97, and 3.26 times than low-SVI zip codes; zip code racial composition, working age population, number of violent crimes, number of police officers and access to a gun, were other predictors of fatal police shootings. CONCLUSIONS: Social vulnerability and racial composition of a zip code are associated with fatal police shooting, both independently and when considered together. What drives deadly police shootings in the United States is not one single factor, but rather complex interactions between social-vulnerability, race, and place that must be tackled synchronously. Action must be taken to address underlying determinants of disparities in policing.

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BACKGROUND: U.S. firearm sales surged during the COVID-19 pandemic, with many purchases by first-time firearm owners. The 2023 National Survey of Gun Policy sought to understand the public health implications of this surge by comparing the purchasing motivations and firearm policy views of pandemic-era first-time purchasers to prior gun owners. METHODS: We fielded a nationally representative public opinion survey of U.S. adults (n = 3096) from 1/4/23 to 2/6/23. We oversampled for gun owners and Black, Hispanic, and Asian Americans. Survey weights were applied to generate representative estimates. New gun owners were identified through affirmative responses to: "Have you bought any guns since January 1, 2020?" and "Did you buy your first gun after January 1, 2020?" Recent purchasers were additionally asked whether concerns of 1) political or 2) racial violence motivated their purchase. Purchase motivations and gun policy support were examined among new and prior gun owners (n = 1002) and compared using logistic regression and predictive probabilities. RESULTS: Overall, 11% of respondents reported purchasing a gun since 1/1/20, 35% for the first time. Among recent purchasers, larger proportions of Democrat, Black, Asian, and Hispanic respondents were new gun owners than Republican or white respondents. Compared to prior owners, odds were 4.5-times higher that new gun owners' recent purchase was motivated by racial violence and 3.2-times higher for political violence. Majority support was found for protective gun policies, with few differences by purchase recency or motivations. The only policy for which support by new and prior gun owners differed significantly was the permit-to-purchase policy (76% v. 63%, respectively). Similarly, few significant differences in support were observed when stratifying by purchase motivation. Notably, both those who reported recent purchase motivations of racial violence and of political violence expressed significantly higher support for a "stand-your-ground" policy compared to those who did not report such motivations. CONCLUSIONS: Racial and political violence appear to be larger concerns among new gun owners, motivating purchasing among demographic groups with traditionally lower gun ownership rates. These findings suggest a need for safety assurances amid racial and political tensions and growing gun ownership. Gun owners' support for such policies remains strong.

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OBJECTIVE: As society strives to curb gun violence among adolescents, understanding the risk factors associated with gun carrying is of critical importance. The current study seeks to examine the relationship between perceived neighborhood disorder and adolescents' susceptibility to carrying a gun to school. More specifically, the aim of the current study was threefold: (1) to examine the direct relationship between perceived neighborhood disorder and exposure to violence, (2) to investigate the association between perceived neighborhood disorder and gun carrying, and (3) to test the mediating effect of exposure to violence on the relationship between perceived neighborhood disorder and gun carrying. METHODS: Data from waves I and II (1994-1996) of the National Longitudinal Study of Adolescent to Adult Health was analyzed (N = 11,887). Due to the binary nature of the mediating and dependent variables (i.e., exposure to violence and gun carrying) a series of logistic regression models were estimated. RESULTS: Our analyses revealed that perceived neighborhood disorder is positive and significantly associated with, both, exposure to violence and gun carrying. The relationship between perceived neighborhood disorder and gun carrying was fully mediated by exposure to violence. CONCLUSIONS: While neighborhood disorder is a risk factor for gun carrying among youth, exposure to violence explains the relationship between perceived neighborhood disorder and carrying a gun to school. To reduce the prevalence of gun carrying and gun violence among the adolescent population, mental health resources should be provided to those who reside in communities with high levels of disorder and violence.

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More than half of suicide deaths in the United States result from self-inflicted firearm injuries. Extreme risk protection order (ERPO) laws in 21 states and the District of Columbia temporarily limit access to firearms for individuals found in a civil court process to pose an imminent risk of harm to themselves or others. Research with large multistate study populations has been lacking to determine effectiveness of these laws. This study assembled records pertaining to 4,583 ERPO respondents in California, Connecticut, Maryland, and Washington. Matched records identified suicide decedents and self-injury method. Researchers applied case fatality rates for each suicide method to estimate nonfatal suicide attempts corresponding to observed deaths. Comparison of counterfactual to observed data patterns yielded estimates of the number of lives saved and number of ERPOs needed to avert one suicide. Estimates varied depending on the assumed probability that a gun owner who attempts suicide will use a gun. Two evidence-based approaches yielded estimates of 17 and 23 ERPOs needed to prevent one suicide. For the subset of 2,850 ERPO respondents with documented suicide concern, comparable estimates were 13 and 18, respectively. This study's findings add to growing evidence that ERPOs can be an effective and important suicide prevention tool.

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A growing body of research has documented how gun violence can affect mental and physical health outcomes among adults. Likewise, the literature is also beginning to reveal negative psychological effects related to distress and hypervigilance and sociological implications around diminished community engagement and economic opportunity. However, there remains a need to fully explore the role of fear related to the experience of gun violence. Through a qualitative inquiry consisting of community resident focus groups and community leader interviews, this study examined how participants' perceptions of fear related to their exposures to and experiences of gun violence. The findings highlight the pervasive emotional experience of existing in a fearful, distressed, and/or anxious state within certain communities, and how civic disengagement, neighborhood disconnection, and economic disenfranchisement exist in communities that disproportionately experience violence.

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Plastid biogenesis and the coordination of plastid and nuclear genome expression through anterograde and retrograde signaling are essential for plant development. GENOMES UNCOUPLED1 (GUN1) plays a central role in retrograde signaling during early plant development. The putative function of GUN1 has been extensively studied, but its molecular function remains controversial. Here, we evaluate published transcriptome data and generate our own data from gun1 mutants grown under signaling relevant conditions to show that editing and splicing are not relevant for GUN1-dependent retrograde signaling. Our study of the plastid (post)-transcriptome of gun1 seedlings with white and pale cotyledons demonstrates that GUN1 deficiency significantly alters the entire plastid transcriptome. By combining this result with a PPR code-based prediction and experimental validation by RNA immunoprecipitation experiments, several putative targets of GUN1 were identified, including tRNAs and RNAs derived from ycf1.2, rpoC1 and rpoC2, and the ndhH-ndhA-ndhI-ndhG-ndhE-psaC-ndhD gene cluster. The absence of plastid rRNAs and the significant reduction of almost all plastid transcripts in white gun1 mutants account for the cotyledon phenotype. Our study provides evidence for RNA binding and maturation as the long-sought molecular function of GUN1 and resolves long-standing controversies. We anticipate that our findings will serve as a basis for subsequent studies investigating the mechanism of plastid gene expression and will facilitate the elucidation of GUN1's function in retrograde signaling.

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Objectives: To examine how "stand-your-ground" (SYG) laws affect children's academic performance. Methods: We analyze 2008-2018 nationwide school district-level math and reading/language arts (RLA) test scores for 3rd-8th grade students combined with information on SYG laws by state and year. We implement two estimation approaches-two-way-fixed effects and group-time average treatment effects-and conduct analyses stratified by student race (Black, White) and area income level. Results: We find negative effects of SYG on math achievement among all students using both estimation approaches (-0.0377 standard deviation decline, p < 0.001 and -0.0493, p < 0.001). We find adverse effects of SYG on math among White students (-0.0315, p = 0.001 and -0.0312, p = 0.08) and among students in low-income districts (-0.0616, p < 0.001 and -0.0903, p < 0.001). The precision of estimates for the effect on math scores among Black students varies across approaches (-0.0666, p = 0.05, -0.0444, p = 0.48). We estimate negative effects of SYG on RLA achievement in only a subset of models. Conclusions: Our findings suggest SYG laws adversely affect math performance among 3rd-8th grade students. Policy implications: These findings underscore the importance of additional work to understand and quantify the relationship between the nation's gun policies and children's academic performance.

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Background: Most Americans believe that gun-free zones make locations more vulnerable to violent crimes, particularly active shootings. However, there is no empirical evidence regarding the impact of gun-free zones on protecting locations from violence. The objective of this study was to estimate the association between gun-free zones and active shootings. Methods: We used a pair-matched case-control study where cases were all US establishments where active shootings occurred between 2014 and 2020, and controls were randomly selected US establishments where active shootings could have but did not occur, pair-matched by establishment type, year, and county. Gun-free status of included establishments was determined via local laws, company policy, news reporting, Google Maps and posted signage, and calling establishments. Findings: Of 150 active shooting cases, 72 (48.0%) were determined to have occurred in a gun-free zone. Of 150 controls where no active shooting occurred, 92 (61.3%) were determined to be gun-free. After accounting for matched pairs, the conditional odds of an active shooting in gun-free establishments were 0.38 times those in non-gun-free establishments, with a 95% confidence interval of 0.19-0.73 (p-value = 0.0038). Several robustness analyses affirmed these findings. Interpretation: It is unlikely that gun-free zones attract active shooters; gun-free zones may be protective against active shootings. This study challenges the proposition of repealing gun-free zones based on safety concerns. Funding: This work was funded in part by the National Collaborative on Gun Violence Research and the Arnold Foundation.

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The carbon nanotube cold cathode has important applications in the X-ray source, microwave tube, neutralizer, etc. In this study, the characteristics of carbon nanotube (CNT) electron gun in series with metal-oxide-semiconductor field-effect transistor (MOSFET) were studied. CNTs were prepared on a stainless steel substrate by chemical vapor deposition and assembled with a mesh gate to form an electron gun. The anode current of the electron gun can be accurately regulated by precisely controlling the MOSFET gate voltage in the subthreshold region from 1 to 40 µA. The current stability measurements show the cathode current fluctuation was 0.87% under 10 h continuous operation, and the corresponding anode current fluctuation was 2.3%. The result has demonstrated that the MOSFET can be applied for the precise control of the CNT electron gun and greatly improve current stability.

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Objectives: To examine factors that differentiate firearm owners who endorse specific reasons for secure and unsecure firearm storage. Methods: A subsample of firearm-owning adults (n = 3,119) drawn from a representative sample of adults (n = 7,785) residing in nine US states participated in an online survey. Results: The most common reason for not always using a gun safe was concerns that they render firearms too slow to access during an emergency (60.2%). The most common reasons for current firearm storage were ensuring ready access in case of emergency (59.7%) and preventing access by children and adolescents (44.6%). Firearm owners varied on their reasons based upon current storage habits, reasons for ownership, and the presence of firearms in the home. Conclusions: Firearm owners with children in the home are more likely to select storage methods they feel will prevent access by vulnerable individuals, whereas those who own for defensive purposes and those who store firearms loaded and unlocked are more likely to endorse storing their firearms for quick home defense and convenience and to see gun safes as unnecessary obstacles.

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OBJECTIVE: To evaluate the efficacy of Resident Education And Counseling on Household (REACH) Firearm Safety, a novel virtual reality (VR) intervention. METHODS: We conducted a single-center, randomized controlled trial among pediatric residents in a Midwestern academic primary care center comparing REACH Firearm Safety with didactic training (intervention) to didactic training alone (control). In the intervention arm, participants practiced firearm safety counseling with virtual characters and received immediate feedback. All residents completed audio-recorded standardized patient (SP) encounters before and after the training as well as a retrospective pre-post survey. Two reviewers, blinded to allocation arm, used a standardized assessment tool to generate performance scores. Outcomes of interest included the difference between groups in SP performance scores and self-reported confidence. RESULTS: From March to July 2023, 62% of eligible pediatric residents (n=47/76) completed the allocated study tasks (Intervention 19, Control 28). In both groups, SP performance scores and self-reported confidence improved. Compared to the control group, the intervention group demonstrated improvement in sharing information on secure storage devices (p=0.009) and increased confidence on providing information on secure storage (p=0.002). CONCLUSION: Compared with didactic training alone, a VR intervention using deliberate practice improved residents' skills and confidence related to firearm safety counseling.

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BACKGROUND: Poor mental health and adverse childhood experiences (ACEs) predict extensive adverse outcomes in youth, including increases in long-term risk for chronic disease and injury, impaired emotional development, and poor academic outcomes. Exposure to school violence, specifically intentional gun violence, is an increasingly prevalent ACE. The anticipation of school shootings has led to the implementation of school safety and security interventions that may increase anxiety, depression, and other indicators of poor mental well-being among students and staff alike. Despite this, the association between exposure to existing school safety interventions and early adolescent student mental health outcomes, while accounting for one's history of ACEs, has not been previously investigated. OBJECTIVE: The study protocol described here aims to determine whether there is a significant difference in the prevalence of mental health outcomes, perceived school safety, and academic engagement between adolescent students (grades 6-12) at schools who have experienced a school shooting and those who have not; whether existing interventions to promote school safety and security are associated with poor mental health outcomes among students and school staff; and what the strength of the association between school safety interventions and mental health outcomes among students and teachers is in schools that have experienced a school shooting versus schools that have never experienced a school shooting. METHODS: This observational study will collect cross-sectional survey data from a nationwide sample of students, teachers, and principals at 12 secondary public schools across the United States. The participants come from 6 randomly selected exposure schools that have either experienced a recent (<2 years ago) intentional school shooting or have experienced an intentional school shooting less recently (>2 years ago). Data from these schools are being directly compared with 6 secondary schools that have never experienced a school shooting. RESULTS: Institutional review board approval for this research project was obtained and the study subsequently began its recruitment and data collection phase in January 2024. Data collection is currently ongoing and the expected completion date is January 2025. The analytic plan is designed to determine if the strength of the association between school safety interventions and mental health outcomes differs among students and school staff in schools with varying levels of school violence exposure. Analyses will be used to evaluate the role of ACEs on the relationships among exposure to an intentional school shooting, exposure to school safety strategies, and student outcomes (ie, mental health and well-being, perceptions of school safety, and educational outcomes). CONCLUSIONS: The results from this study promise to generate meaningful and novel findings on the extent to which having a prior history of ACEs moderates the relationships among exposure to intentional school gun violence, school safety strategies, and student outcomes (ie, mental health and well-being, and perceptions of school safety). TRIAL REGISTRATION: ClinicalTrials.gov NCT06153316; https://clinicaltrials.gov/study/NCT06153316. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): DERR1-10.2196/56249.

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The coronavirus disease 2019 pandemic was a public health emergency that impacted adolescents across the United States and disproportionately affected youth experiencing marginalization due to less access to resources and supports. This study reviews the increases in intimate partner and youth violence during the pandemic, mechanisms contributing to these increases, and the overarching health impacts on adolescents. Pediatric health professionals have a vital role to play in implementing healing-centered practices and prevention efforts that mitigate impacts of trauma and violence and that support youth and families in pathways to healing and recovery.

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