A Short Adverse Experiences Measure Among Mothers of Young Children.

OBJECTIVES: Screening for parental adverse childhood experiences (ACEs) in pediatric settings can be burdensome because of the questionnaire's length and sensitive nature. Rapid screening tools may help address these challenges. We evaluated a 2-item short ACE measure developed for adults in a cross-sectional sample of mothers of young children in an urban pediatric emergency department. METHODS: From January 2011 to March 2020, we administered the ACE questionnaire in English or Spanish to 3999 biological mothers of children aged <4 years in a pediatric emergency department in Philadelphia, Pennsylvania. We assessed sensitivity and specificity of a shortened 2-item ACE measure defined as report of childhood emotional abuse and/or household substance use, using 4+ ACEs on the full questionnaire as the standard. We assessed convergent validity by comparing associations of the 2-item and standard measures with maternal, household, and child outcomes using adjusted log-binomial regression. RESULTS: Mothers were racially and ethnically diverse (54% Latina, 35% Black non-Latina); 94% of children were publicly insured. Thirteen percent of mothers reported childhood emotional abuse and 16% childhood household substance use; 23% reported at least 1 of these and 6% both. Compared with 4+ ACEs on the full questionnaire, the 2-item measure had sensitivity 88% and specificity 90%. In adjusted models, high adversity was associated with poor maternal, household, and child outcomes. CONCLUSIONS: A 2-item ACE measure assessing childhood emotional abuse and household substance use may be useful in pediatric settings to identify mothers who may have experienced significant child adversity and inform development, testing, or provision of comprehensive family supports.

Operationalizing inclusion: moving from an elusive goal to strategic action.

To mitigate the structural and institutional biases that contribute to inequities in health, we need a diverse cadre of individuals to feel included and advance within our field in order to bring a multicultural set of perspectives to the studies we conduct, the science we generate, the health and academic systems we design, and the medical and scientific knowledge we impart. There has been increasing focus on diversity, inclusion, and equity in recent years; however, often these terms are presented without adequate precision and, therefore, the inability to effectively operationalize inclusion and achieve diversity within organizations. This narrative review details several key studies, with the primary objective of presenting a roadmap to guide defining, measuring, and operationalizing inclusion within work and learning environments.

Diversity in the pediatric research workforce: a scoping review of the literature.

The purpose of this scoping review is to determine trends in racial and ethnic representation, identify barriers and facilitators to greater diversity, and assess strategies and interventions to advance diversity among those in the pediatric research workforce in the U.S. We conducted a scoping review of PubMed supplemented with the authors' personal library of papers published from January 1, 2010, to December 31, 2021. To be eligible, papers had to provide original data, be published in English, report information from a U.S. healthcare institution, and report on outcomes of interest relevant to the child health field. The diversity of faculty has modestly increased over the past decade but reflects a worsening representation compared to overall population trends. This slow increase reflects a loss of diverse faculty and has been referred to as a "leaky pipeline." Strategies to plug the "leaky pipeline" include greater investments in pipeline programs, implementation of holistic review and implicit bias training, development of mentoring and faculty programs targeted to diverse faculty and trainees, alleviation of burdensome administrative tasks, and creation of more inclusive institutional environments. Modest improvements in the racial and ethnic diversity of the pediatric research workforce were identified. However, this reflects worsening overall representation given changing U.S. population demographics. IMPACT: Racial and ethnic diversity in the pediatric research workforce has shown modest increases but worsening overall representation. This review identified barriers and facilitators at the intrapersonal, interpersonal, and institutional levels that impact BIPOC trainees and faculty career advancement. Strategies to improve the pathway for BIPOC individuals include greater investments in pipeline and educational programs, implementation of holistic review admissions and bias training, institution of mentoring and sponsorship, alleviation of burdensome administrative responsibilities, and creation of inclusive institutional climates. Future studies should rigorously test the effects of interventions and strategies designed to improve diversity in the pediatric research workforce.

Adverse Childhood Experiences and Teen Behavior Outcomes: The Role of Disability.

OBJECTIVE: To examine associations between adverse childhood experiences (ACEs) and teen behavior outcomes and whether the presence of disability moderates this relationship. METHODS: We conducted a secondary analysis of population-based data from the Fragile Families & Child Wellbeing Study urban birth cohort. Disability status included physical/developmental/behavioral conditions (ages 1-5) using mother-reported child health conditions and cognitive disability (age 9), measured by the Peabody Picture Vocabulary Test (PPVT), an assessment of receptive vocabulary. We investigated whether either disability type moderates the relationship between ACEs occurring between ages 5 to 9 and behavior outcomes at age 15, specifically, standardized scales of caregiver-reported externalizing and youth-reported internalizing and delinquent behaviors. Associations were examined using multivariate linear regression models, including interaction effects of ACEs with low PPVT score and disability conditions to assess for potential moderation. RESULTS: Of the 3038 children included, 15% had a cognitive disability and 24% had a disabling health condition. The presence of 2 or more ACEs (compared to none) is associated with more externalizing (by 0.34 standard deviations [SD]), internalizing (0.18 SD), and delinquent (0.18 SD) behaviors. Cognitive disability exacerbates this association for externalizing behaviors and delinquent behaviors while other disabling health conditions do not. CONCLUSIONS: ACEs were associated with more behavior problems among urban youth. Cognitive disability, but not other disabling health conditions, compounded this association for externalizing and delinquent behaviors, indicating these children may be particularly vulnerable to the effects of trauma and adversity. Targeted assessment and resources for youth with cognitive disability are critical.

Amendment for increased methane production rate in municipal solid waste landfill gas collection systems.

Optimization of methane production rate can potentially decrease the operational lifetime of the landfill site and assist with better management of methane harvesting from the landfill cells. Increased moisture content in landfill cells is known to increase the rate of methane production. Several natural biopolymers can sustain moisture content in a solid matrix while providing a scaffolding for microbial communities to grow. This research examined the effect of the biopolymer, produced by Rhizobium tropici, on bench-scale methane generation from municipal solid waste. The addition of the R. tropici biopolymer increased the rate of methane production from 27% to 78% when compared to the control study for low and high concentrations of biopolymer amendment, respectively. R. tropici biopolymer shortened the lag phase by up to six days over the control, depending on the level of biopolymer amendment added to the solid waste. The mechanism appears to be facilitating biofilm formation through the combination of increased moisture retention and surface modification of the solid waste. Incorporation of biopolymer amendment in the alternative daily cover activities at commercial landfills could provide a viable approach for full scale application.

Understanding the Impact of Seeing Gun Violence and Hearing Gunshots in Public Places: Findings From the Youth Firearm Risk and Safety Study.

There is a current public health emphasis on finding strategies for reducing the risks associated with children's gun violence exposure. This article examines the impact of seeing and hearing gun violence on youth of different ages and living in urban and nonurban areas. Participants were 630 youth, aged 2 to 17. Youth, ages 10 to 17, completed a self-report survey, and caregivers of young children, ages 2 to 9, completed the survey as a proxy for that child. Participants resided in Boston, MA; Philadelphia, PA; and rural areas of eastern TN. Participants were recruited through a variety of techniques including pediatric clinics, housing authorities, youth-serving agencies, festivals, word of mouth, and local e-mail lists for classified advertisements. Data were collected between October 2017 and April 2018 and analyzed in 2019. In total, 41% of youth in this study reported ever seeing or hearing gun violence; 32% had such an experience in the past year. Among exposed youth, 50% took protective action to keep themselves safe, and 58% reported being very or extremely afraid, sad, or upset as a result of the indirect gun violence. More youth living in urban compared with nonurban areas took some protective action. Females and younger children had increased odds of experiencing high fear as a result of the violence. Current gun violence prevention has typically targeted adolescents; however, current findings suggest the need to focus on younger children as well, including the distress resulting from indirect exposure to gun violence.

The Youth Firearm Risk and Safety Tool (Youth-FiRST): Psychometrics and Validation of a Gun Attitudes and Violence Exposure Assessment Tool.

This study reports on the development of a comprehensive assessment of exposure to guns and gun-related violence for evaluating the risk of gun-related trauma. Gun access, gun attitudes, gun safety education, and exposure to gun violence were measured. Participants were 630 youth, aged 2-17. Youth, ages 10-17, completed a self-report survey and caregivers of young children, ages 2-9, completed the survey as a proxy for that child. The youth were from urban (n = 286) and rural (n = 344) areas. Factor analysis, item response theory, and structural equation modeling were used. Two factors described access to guns, two factors described gun attitudes, and a single construct captured gun safety education. The gun violence exposure factor showed strong associations with trauma symptomatology. The individual constructs showed good psychometric properties and measurement noninvariance by urbanicity.

Gun Violence Exposure and Posttraumatic Symptoms Among Children and Youth.

Although statistics on youth homicide and injury from gun violence are available, little research has focused on how gun violence overlaps with other victimizations or on the psychological impact of gun violence on children. Pilot survey data were collected on the experiences of 630 U.S. children (age range: 2-17 years) from Boston, Philadelphia, and rural areas of eastern Tennessee. Youth aged 10-17 years completed a self-report survey on a wide range of gun violence exposures, and parents of younger children (aged 2-9 years) completed the survey as a proxy for that child. Direct gun violence exposure, witnessing gun violence, and hearing gunshots were all significantly associated with other forms of victimization, rs = .10-.38, p < .001. The findings suggest that youth who experience direct gun violence are often exposed to multiple violent contexts. For older youth (ages 10-17 years) polyvictimization was most strongly associated with posttraumatic symptoms, ß = .35, p < .001, although witnessing gun violence still uniquely predicted a higher level of symptoms, ß = .18, p < .01. For younger children (ages 2-9 years), hearing and witnessing gun violence were both related to posttraumatic symptoms, ß = .15, p < .01 for both, even after controlling for polyvictimization. Mental health professionals and trauma-informed services should be mindful that the traumatic impact of gun violence for children may not necessarily be attached to direct victimization experiences but may also result from simply seeing or hearing it in their neighborhoods.

Methods to Assess Adverse Childhood Experiences of Children and Families: Toward Approaches to Promote Child Well-being in Policy and Practice.

BACKGROUND: Advances in human development sciences point to tremendous possibilities to promote healthy child development and well-being across life by proactively supporting safe, stable and nurturing family relationships (SSNRs), teaching resilience, and intervening early to promote healing the trauma and stress associated with disruptions in SSNRs. Assessing potential disruptions in SSNRs, such as adverse childhood experiences (ACEs), can contribute to assessing risk for trauma and chronic and toxic stress. Asking about ACEs can help with efforts to prevent and attenuate negative impacts on child development and both child and family well-being. Many methods to assess ACEs exist but have not been compared. The National Survey of Children's Health (NSCH) now measures ACEs for children, but requires further assessment and validation. METHODS: We identified and compared methods to assess ACEs among children and families, evaluated the acceptability and validity of the new NSCH-ACEs measure, and identified implications for assessing ACEs in research and practice. RESULTS: Of 14 ACEs assessment methods identified, 5 have been used in clinical settings (vs public health assessment or research) and all but 1 require self or parent report (3 allow child report). Across methods, 6 to 20 constructs are assessed, 4 of which are common to all: parental incarceration, domestic violence, household mental illness/suicide, household alcohol or substance abuse. Common additional content includes assessing exposure to neighborhood violence, bullying, discrimination, or parental death. All methods use a numeric, cumulative risk scoring methodology. The NSCH-ACEs measure was acceptable to respondents as evidenced by few missing values and no reduction in response rate attributable to asking about children's ACEs. The 9 ACEs assessed in the NSCH co-occur, with most children with 1 ACE having additional ACEs. This measure showed efficiency and confirmatory factor analysis as well as latent class analysis supported a cumulative risk scoring method. Formative as well as reflective measurement models further support cumulative risk scoring and provide evidence of predictive validity of the NSCH-ACEs. Common effects of ACEs across household income groups confirm information distinct from economic status is provided and suggest use of population-wide versus high-risk approaches to assessing ACEs. CONCLUSIONS: Although important variations exist, available ACEs measurement methods are similar and show consistent associations with poorer health outcomes in absence of protective factors and resilience. All methods reviewed appear to coincide with broader goals to facilitate health education, promote health and, where needed, to mitigate the trauma, chronic stress, and behavioral and emotional sequelae that can arise with exposure to ACEs. Assessing ACEs appears acceptable to individuals and families when conducted in population-based and clinical research contexts. Although research to date and neurobiological findings compel early identification and health education about ACEs in clinical settings, further research to guide use in pediatric practice is required, especially as it relates to distinguishing ACEs assessment from identifying current family psychosocial risks and child abuse. The reflective as well as formative psychometric analyses conducted in this study confirm use of cumulative risk scoring for the NSCH-ACEs measure. Even if children have not been exposed to ACEs, assessing ACEs has value as an educational tool for engaging and educating families and children about the importance of SSNRs and how to recognize and manage stress and learn resilience.

A Pilot Randomized Trial of a Video Patient Decision Aid to Facilitate Early Intervention Referrals From Primary Care.

Many young children identified with developmental concerns in pediatric settings do not receive early intervention (EI). We assessed the impact of a video decision aid and text message reminder on knowledge and attitudes regarding developmental delay and EI as well as referral completion. We conducted a pilot randomized controlled trial in an urban setting and enrolled 64 parent-child dyads referred to EI. Compared with controls, participants who received the intervention demonstrated increased knowledge regarding developmental delay and EI as well as more favorable attitudes in certain topics. Although we did not find a significant difference between arms in EI intake and evaluation, we found a pattern suggestive of increased intake and evaluation among participants with low health literacy in the intervention arm. Additional study is needed to identify strategies that improve the EI referral process for families and to understand the potential targeted role for decision aids and text messages.

Adverse Childhood Experiences and ADHD Diagnosis at Age 9 Years in a National Urban Sample.

OBJECTIVE: To examine associations between adverse childhood experiences (ACEs) and attention-deficit/hyperactivity disorder (ADHD) at age 9 years using longitudinal data and assess the extent to which ACEs during middle childhood are independently associated with ADHD at age 9 years. METHODS: We conducted a secondary analysis of data from the Fragile Families urban birth cohort 5- and 9-year interviews. The sample was limited to children for whom mothers were the primary caregiver and mother-reported information on 8 ACEs and ADHD were available at age 5 and 9 years. We examined associations between ACEs and parent-reported ADHD at age 9 years using logistic regression and controlling for potential confounders. RESULTS: We included 1572 children; 48% were African American, 11% had parent-reported ADHD at age 9 years, 41% and 42% experienced ≥1 ACE by age 5 years and between the ages of 5 and 9 years, respectively. ACEs before age 5 years were associated with ADHD at age 9 years. One, 2, and ≥3 ACEs between age 5 and 9 years were associated with ADHD at age 9 years even after controlling for ACEs before age 5 years and ADHD at age 5 years (adjusted odds ratio [AOR], 1.9; 95% confidence interval [CI], 1.2-3; AOR, 2.1; 95% CI, 1.2-3.8; and AOR, 2.2; 95% CI, 1.1-4.3). CONCLUSIONS: In this study of urban children, ACEs occurring before age 5 years as well as between the ages of 5 and 9 years were associated with ADHD at age 9 years. Even after controlling for early childhood ACEs and ADHD at age 5 years, the association between ADHD and ACEs in middle childhood remained significant, highlighting the importance of screening and intervention throughout childhood.

Development and Evaluation of a Short Adverse Childhood Experiences Measure.

INTRODUCTION: Clinicians require tools to rapidly identify individuals with significant childhood adversity as part of routine primary care. The goal of this study was to shorten the 11-item Behavioral Risk Factor Surveillance System Adverse Childhood Experiences (ACEs) measure and evaluate the feasibility and validity of this shortened measure as a screener to identify adults who have experienced significant childhood adversity. METHODS: Statistical analysis was conducted in 2015. ACE item responses obtained from 2011-2012 Behavioral Risk Factor Surveillance System data were combined to form a sample of 71,413 adults aged ≥18 years. The 11-item Behavioral Risk Factor Surveillance System ACE measure was subsequently reduced to a two-item screener by maintaining the two dimensions of abuse and household stressors and selecting the most prevalent item within each dimension. RESULTS: The screener included household alcohol and childhood emotional abuse items. Overall, 42% of respondents and at least 75% of the individuals with four or more ACEs endorsed one or both of these experiences. Using the 11-item ACE measure as the standard, a cut off of one or more ACEs yielded a sensitivity of 99%, but specificity was low (66%). Specificity improved to 94% when using a cut off of two ACEs, but sensitivity diminished (70%). There was no substantive difference between the 11-and two-item ACE measures in their strength of association with an array of health outcomes. CONCLUSIONS: A two-item ACE screener appropriate for rapid identification of adults who have experienced significant childhood adversity was developed.

Screening for Social Determinants of Health Among Children and Families Living in Poverty: A Guide for Clinicians.

Approximately 20% of all children in the United States live in poverty, which exists in rural, urban, and suburban areas. Thus, all child health clinicians need to be familiar with the effects of poverty on health and to understand associated, preventable, and modifiable social factors that impact health. Social determinants of health are identifiable root causes of medical problems. For children living in poverty, social determinants of health for which clinicians may play a role include the following: child maltreatment, child care and education, family financial support, physical environment, family social support, intimate partner violence, maternal depression and family mental illness, household substance abuse, firearm exposure, and parental health literacy. Children, particularly those living in poverty, exposed to adverse childhood experiences are susceptible to toxic stress and a variety of child and adult health problems, including developmental delay, asthma and heart disease. Despite the detrimental effects of social determinants on health, few child health clinicians routinely address the unmet social and psychosocial factors impacting children and their families during routine primary care visits. Clinicians need tools to screen for social determinants of health and to be familiar with available local and national resources to address these issues. These guidelines provide an overview of social determinants of health impacting children living in poverty and provide clinicians with practical screening tools and resources.

Household and community-level Adverse Childhood Experiences and adult health outcomes in a diverse urban population.

Adverse Childhood Experiences (ACEs), which include family dysfunction and community-level stressors, negatively impact the health and well being of children throughout the life course. While several studies have examined the impact of these childhood exposures amongst racially and socially diverse populations, the contribution of ACEs in the persistence of socioeconomic disparities in health is poorly understood. To determine the association between ACEs and health outcomes amongst a sample of adults living in Philadelphia and examine the moderating effect of Socioeconomic Status (SES) on this association, we conducted a cross-sectional survey of 1,784 Philadelphia adults, ages 18 and older, using random digit dialing methodology to assess Conventional ACEs (experiences related to family dysfunction), Expanded ACEs (community-level stressors), and health outcomes. Using weighted, multivariable logistic regression analyses along with SES stratified models, we examined the relationship between ACEs and health outcomes as well as the modifying effect of current SES. High Conventional ACE scores were significantly associated with health risk behaviors, physical and mental illness, while elevated Expanded ACE scores were associated only with substance abuse history and sexually transmitted infections. ACEs did have some differential impacts on health outcomes based on SES. Given the robust impact of Conventional ACEs on health, our results support prior research highlighting the primacy of family relationships on a child's life course trajectory and the importance of interventions designed to support families. Our findings related to the modifying effect of SES may provide additional insight into the complex relationship between poverty and childhood adversity.

Adverse Experiences in Early Childhood and Kindergarten Outcomes.

OBJECTIVE: To examine associations between adverse childhood experiences (ACEs) in early childhood and teacher-reported academic and behavioral problems in kindergarten. METHODS: We conducted a secondary analysis of data from the Fragile Families and Child Wellbeing Study, a national urban birth cohort. Subjects with primary caregiver-reported information on ACE exposures ascertained at 5 years and teacher-reported outcomes at the end of the child's kindergarten year were included. Outcomes included teacher ratings of academic skills, emergent literacy skills, and behavior. We included 8 ACE exposures on the basis of the original Centers for Disease Control and Prevention Kaiser study and created an ACE score by summing individual adversities. We examined the associations between teacher-reported academic and behavioral outcomes and ACE scores by using logistic regression. RESULTS: In the study sample, 1007 children were included. Fifty-five percent had experienced 1 ACE and 12% had experienced ≥ 3. Adjusting for potential confounders, experiencing ≥ 3 ACEs was associated with below-average language and literacy skills (adjusted odds ratio [AORs]: 1.8; 95% confidence interval [CI]: 1.1-2.9) and math skills (AOR: 1.8, 95% CI: 1.1-2.9), poor emergent literacy skills, attention problems (AOR: 3.5, 95% CI: 1.8-6.5), social problems (AOR: 2.7, 95% CI: 1.4-5.0), and aggression (AOR: 2.3, 95% CI: 1.2-4.6). CONCLUSIONS: In this study of urban children, experiencing ACEs in early childhood was associated with below-average, teacher-reported academic and literacy skills and behavior problems in kindergarten. These findings underscore the importance of integrated approaches that promote optimal development among vulnerable children.

Adverse Childhood Experiences: Expanding the Concept of Adversity.

INTRODUCTION: Current knowledge of Adverse Childhood Experiences (ACEs) relies on data predominantly collected from white, middle- / upper-middle-class participants and focuses on experiences within the home. Using a more socioeconomically and racially diverse urban population, Conventional and Expanded (community-level) ACEs were measured to help understand whether Conventional ACEs alone can sufficiently measure adversity, particularly among various subgroups. METHODS: Participants from a previous large, representative, community-based health survey in Southeast Pennsylvania who were aged ≥18 years were contacted between November 2012 and January 2013 to complete another phone survey measuring ACEs. Ordinal logistic regression models were used to test associations between Conventional and Expanded ACEs scores and demographic characteristics. Analysis was conducted in 2013 and 2014. RESULTS: Of 1,784 respondents, 72.9% had at least one Conventional ACE, 63.4% at least one Expanded ACE, and 49.3% experienced both. A total of 13.9% experienced only Expanded ACEs and would have gone unrecognized if only Conventional ACEs were assessed. Certain demographic characteristics were associated with higher risk for Conventional ACEs but were not predictive of Expanded ACEs, and vice versa. Few adversities were associated with both Conventional and Expanded ACEs. CONCLUSIONS: To more accurately represent the level of adversity experienced across various sociodemographic groups, these data support extending the Conventional ACEs measure.

Adverse events in children: predictors of adult physical and mental conditions.

CASE: A senior member of a 5-person pediatric group recently heard a presentation about the Adverse Childhood Experiences (ACE) study. He decided to present the study to his colleagues with the intention of incorporating a similar screening tool for ACE in their practice.The ACE study assessed adverse child experiences recalled by 17,000 adult patients who were participating in a comprehensive medical evaluation at a large Health Maintenance Organization. The ACE questionnaire assessed emotional, physical, and sexual abuse; emotional and physical neglect; mother treated violently; household substance abuse; household mental abuse; parental separation or divorce; and incarcerated household members (http://www.acestudy.org/yahoo_site_admin/assets/docs/ACE_Calculator-English.127143712.pdf).Thirty-six percent of the participants did not endorse any ACE. One, 2 or 3 ACE's were endorsed by 26%, 16%, and 9.5%, respectively. Four or more ACEs were endorsed by 12% of the cohort. The study found that "the major risk factors for causes of death in adults, smoking, alcohol abuse, obesity, physical inactivity, use of illicit drugs, promiscuity, and suicide attempts, were all increased by ACEs. Compared with persons with an ACE score of 0, those with an ACE score of 4 or more were twice as likely to be smokers, 12 times more likely to have attempted suicide, 7 times more likely to be alcoholic, and 10 times more likely to have injected street drugs" (2).When he researched the ACE study further, the pediatrician discovered that there was a modified form of the ACE study questions available for parents of children and adolescents. The members of the pediatric practice were intrigued by the reported relationship between ACEs and the high prevalence of chronic physical and mental health conditions and economic outcomes. Could this be a method for pediatricians to screen for risks of serious physical and psychiatric diseases in adult life? A brisk discussion followed about what they would do with this information if the ACE screening questions were used in their practice. Is it an effective strategy for primary care pediatric practice?

Adverse childhood experiences of low-income urban youth.

BACKGROUND AND OBJECTIVE: Current assessments of adverse childhood experiences (ACEs) may not adequately encompass the breadth of adversity to which low-income urban children are exposed. The purpose of this study was to identify and characterize the range of adverse childhood experiences faced by young adults who grew up in a low-income urban area. METHODS: Focus groups were conducted with young adults who grew up in low-income Philadelphia neighborhoods. Using the nominal group technique, participants generated a list of adverse childhood experiences and then identified the 5 most stressful experiences on the group list. The most stressful experiences identified by participants were grouped into a ranked list of domains and subdomains. RESULTS: Participants identified a range of experiences, grouped into 10 domains: family relationships, community stressors, personal victimization, economic hardship, peer relationships, discrimination, school, health, child welfare/juvenile justice, and media/technology. Included in these domains were many but not all of the experiences from the initial ACEs studies; parental divorce/separation and mental illness were absent. Additional experiences not included in the initial ACEs but endorsed by our participants included single-parent homes; exposure to violence, adult themes, and criminal behavior; personal victimization; bullying; economic hardship; and discrimination. CONCLUSIONS: Gathering youth perspectives on childhood adversity broadens our understanding of the experience of stress and trauma in childhood. Future work is needed to determine the significance of this broader set of adverse experiences in predisposing children to poor health outcomes as adults.

A conserved histidine in cytochrome c maturation permease CcmB of Shewanella putrefaciens is required for anaerobic growth below a threshold standard redox potential.

Shewanella putrefaciens strain 200 respires a wide range of compounds as terminal electron acceptor. The respiratory versatility of Shewanella is attributed in part to a set of c-type cytochromes with widely varying midpoint redox potentials (E'(0)). A point mutant of S. putrefaciens, originally designated Urr14 and here renamed CCMB1, was found to grow at wild-type rates on electron acceptors with high E'0 [O2, NO3-, Fe(III) citrate, MnO2, and Mn(III) pyrophosphate] yet was severely impaired for growth on electron acceptors with low E'0 [NO2-, U(VI), dimethyl sulfoxide, TMAO (trimethylamine N-oxide), fumarate, gamma-FeOOH, SO3(2-), and S2O3(2-)]. Genetic complementation and nucleotide sequence analyses indicated that the CCMB1 respiratory mutant phenotype was due to mutation of a conserved histidine residue (H108Y) in a protein that displayed high homology to Escherichia coli CcmB, the permease subunit of an ABC transporter involved in cytochrome c maturation. Although CCMB1 retained the ability to grow on electron acceptors with high E'(0), the cytochrome content of CCMB1 was <10% of that of the wild-type strain. Periplasmic extracts of CCMB1 contained slightly greater concentrations of the thiol functional group (-SH) than did the wild-type strain, an indication that the E(h) of the CCMB1 periplasm was abnormally low. A ccmB deletion mutant was unable to respire anaerobically on any electron acceptor, yet retained aerobic respiratory capability. These results suggest that the mutation of a conserved histidine residue (H108) in CCMB1 alters the redox homeostasis of the periplasm during anaerobic growth on electron acceptors with low (but not high) E'0. This is the first report of the effects of Ccm deficiencies on bacterial respiration of electron acceptors whose E'0 nearly span the entire redox continuum.