Genomic and global gene expression profiling in pediatric and young adult acute leukemia with PICALM::MLLT10 Fusion.

PICALM: MLLT10 fusion is a rare but recurrent genetic driver in acute leukemias. To better understand the genomic landscape of PICALM::MLLT10 (PM) positive acute leukemia, we performed genomic profiling and gene expression profiling in twenty PM-positive patients, including AML (n = 10), T-ALL/LLy (n = 8), Mixed-phenotype acute leukemia (MPAL), T/B (n = 1) and acute undifferentiated leukemia (AUL) (n = 1). Besides confirming the known activation of HOXA, differential gene expression analysis compared to hematopoietic stem cells demonstrated the enrichment of genes associated with cell proliferation-related pathways and relatively high expression of XPO1 in PM-AML and PM-T-ALL/LLy. Our study also suggested PHF6 disruption as a key cooperating event in PICALM::MLLT10-positive leukemias. In addition, we demonstrated differences in gene expression profiles as well as remarkably different spectra of co-occurring mutations between PM-AML and PM-T-ALL/LLy. Alterations affecting TP53 and NF1, hallmarks of PM-AML, are strongly associated with disease progression and relapse, whereas EZH2 alterations are highly enriched in PM-T-ALL/LLy. This comprehensive genomic and transcriptomic profiling provides insights into the pathogenesis and development of PICALM::MLLT10 positive acute leukemia.

Dense sampling of ethnic groups within African countries reveals fine-scale genetic structure and extensive historical admixture.

Previous studies have highlighted how African genomes have been shaped by a complex series of historical events. Despite this, genome-wide data have only been obtained from a small proportion of present-day ethnolinguistic groups. By analyzing new autosomal genetic variation data of 1333 individuals from over 150 ethnic groups from Cameroon, Republic of the Congo, Ghana, Nigeria, and Sudan, we demonstrate a previously underappreciated fine-scale level of genetic structure within these countries, for example, correlating with historical polities in western Cameroon. By comparing genetic variation patterns among populations, we infer that many northern Cameroonian and Sudanese groups share genetic links with multiple geographically disparate populations, likely resulting from long-distance migrations. In Ghana and Nigeria, we infer signatures of intermixing dated to over 2000 years ago, corresponding to reports of environmental transformations possibly related to climate change. We also infer recent intermixing signals in multiple African populations, including Congolese, that likely relate to the expansions of Bantu language-speaking peoples.

The Impact of Resilience, Health Literacy, and Social Support on Medication Adherence and Self-care Among Adults With Heart Failure.

BACKGROUND: Personal and psychological factors, such as depression, have a considerable influence on nonadherence to medications and self-care in those with heart failure. More evidence is needed about positive personal factors that motivate adherence to medications and self-care in those with heart failure. OBJECTIVE: The purpose of this study was to investigate whether there was a relationship between the personal resources of resilience, hope, health literacy, social support, and self-care activation and adherence to HF self-care and medications and whether race impacts adherence. METHODS: This study used a cross-sectional, correlational design. Stepwise regression was used to test whether resilience, hope, health literacy, self-care activation, and race significantly predicted medication adherence and self-care. A diverse sample was recruited for this study. RESULTS: Of the 174 participants, 51% were female, 51.7% were White, and the mean age was 62 years. After adjustment for differences in age and depressive symptoms, a predictive relationship remained between resilience, health literacy, and medication adherence. Hope, activation, and race were not selected in the final regression model. A high level of perceived social support was the only predictor of better HF self-care. CONCLUSION: Persons with heart failure may have better medication adherence and overall self-care if sufficiently resilient, health literate, and supported regardless of their degree of hope or activation. Race and age may be important factors to consider. More research is needed to understand the connection between resilience and medication adherence.

A proteolytically activated antimicrobial toxin encoded on a mobile plasmid of Bacteroidales induces a protective response.

Phocaeicola vulgatus is one of the most abundant and ubiquitous bacterial species of the human gut microbiota, yet a comprehensive analysis of antibacterial toxin production by members of this species has not been reported. Here, we identify and characterize a previously undescribed antibacterial protein. This toxin, designated BcpT, is encoded on a small mobile plasmid that is largely confined to strains of the closely related species Phocaeicola vulgatus and Phocaeicola dorei. BcpT is unusual in that it requires cleavage at two distinct sites for activation, and we identify bacterial proteases that perform this activation. We further identify BcpT's receptor as the Lipid A-core glycan, allowing BcpT to target species of other Bacteroidales families. Exposure of cells to BcpT induces a response involving an unusual sigma/anti-sigma factor pair that is likely triggered by cell envelope stress, resulting in the expression of genes that partially protect cells from multiple antimicrobial toxins.

The Online Use of the Newest Vital Sign in Adolescents.

Seventy percent of premature adult deaths are caused by adolescent behaviors. Data suggests that health literacy may influence adolescent behaviors. However, adolescent health literacy research is scarce; and, timely, more robust data is imperative. Nonetheless, many potential study samples are currently inaccessible due to the pandemic. Thus, there is an immediate need to evaluate online adolescent health literacy research modalities to further the science. The purpose of this study is to explore the psychometric properties of online administration of the Newest Vital Sign (NVS) health literacy instrument in adolescents. A total of 105 adolescents completed the study via Qualtrics. Internal consistency reliability of the online NVS was good (α = .77). There was, however, no significant correlation between online and in-person comparison scores (r = .05, p = .59). This study yields clinically significant results showing insight into the online NVS for adolescents, providing a foundation for future adolescent health literacy research.

Home Environment Influence on Adolescent Health Literacy.

Adolescent health disparities are influenced by individuals' health literacy. To date, the only known household factors to influence adolescent health literacy (AHL) are social capital factors of parental health literacy, parent education, and household income. Therefore, the purpose of this study was to expand the understanding of household factors that influence AHL for future interventions. A sample of 105 adolescents and their parents completed an online survey. Home environment variables included family communication, family involvement, and books in the home. A quantitative analysis of correlations and regression was employed to explore the relationship between AHL and household factors. Findings from this study suggest that parental health literacy is the best-known household facilitator of AHL. Family communication and family involvement were not correlated with AHL. The number of books in the home was correlated with AHL. A good understanding of the factors influencing AHL is necessary for developing interventions. These findings continue to lend support that AHL is heavily associated with parental health literacy. Based on the salience of these findings in the research, future health literacy interventions should consider incorporating a parent/caregiver component. Yet, what remains unknown is the mechanism between AHL and parental health literacy.

AusTraits, a curated plant trait database for the Australian flora.

We introduce the AusTraits database - a compilation of values of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 448 traits across 28,640 taxa from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary in scope from physiological measures of performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological attributes (e.g. leaf area, seed mass, plant height) which link to aspects of ecological variation. AusTraits contains curated and harmonised individual- and species-level measurements coupled to, where available, contextual information on site properties and experimental conditions. This article provides information on version 3.0.2 of AusTraits which contains data for 997,808 trait-by-taxon combinations. We envision AusTraits as an ongoing collaborative initiative for easily archiving and sharing trait data, which also provides a template for other national or regional initiatives globally to fill persistent gaps in trait knowledge.

The health literacy disparity in adolescents with sickle cell disease.

PURPOSE: There are over 100,000 individuals with sickle cell disease (SCD) in the United States, most of whom are Black, poor, and publically insured. In combination with a chronic illness, these demographics lead to significant barriers to healthcare for patients with SCD, leaving them exceptionally vulnerable within the healthcare system. This unique vulnerability is especially notable when transitioning adolescents with SCD from pediatric to adult care, as this is a significant time of morbidity and mortality for these patients. It is postulated that health literacy influences transition from pediatric to adult care in adolescents with SCD. To better understand this relationship, more adolescent health literacy research must be conducted with both adolescents with and without SCD. Therefore, the purpose of this study is to systematically compare health literacy in adolescents with and without SCD. DESIGN AND METHODS: This is a cross-sectional, descriptive, exploratory study. One hundred and thirty-four adolescents with SCD and 105 adolescents without SCD were recruited for this study. The Newest Vital Sign (NVS) health literacy instrument was used to evaluate health literacy. Pearson correlations were conducted to evaluate relationships among health literacy and the influencing factors of age, grade level, income, and parental education level. Differences in NVS scores between groups were assessed using independent samples t tests. RESULTS: There was a significant relationship between health literacy, age (r = .286, p < .01) and grade level (r = .317, p = .00) in adolescents with SCD. In adolescents without SCD, there was a significant relationship between health literacy, income (r = .235; p < .05) and parental education (r = .263; p < .01). The mean NVS score was 2.66 for adolescents with SCD and 3.77 for adolescents without SCD. A statistically significant difference in NVS scores was found between groups (t = 4.772; p < .001). Adolescents with SCD demonstrated significantly lower NVS scores than adolescents without SCD. PRACTICE IMPLICATIONS: There are significant differences in health literacy scores and influencing factors in adolescents with and without SCD. Thus, this article provides unique insight for nurses as they design, implement and evaluate health promotion, patient education, and future research initiatives for adolescents and families, both with and without SCD. Further research is needed to gain more insight into this phenomenon.

The Influence of Health-Seeking Behaviors on the Health Literacy of Adolescents With Sickle Cell Disease.

Background: Health literacy may influence the transition from pediatric care to adult care in adolescents with sickle cell disease (SCD). It is postulated that one influencing factor of health literacy in adolescents with SCD is health-seeking behavior. The purpose of this study was twofold: (1) to explore health-seeking behaviors of adolescents with SCD and (2) to determine if there are significant differences in health literacy levels of adolescents with SCD based upon health-seeking behaviors. Methods: This was a cross-sectional, descriptive study evaluating health-seeking behaviors and health literacy in 110 Black and non-Hispanic adolescents with SCD. Convenience sampling was utilized for recruitment. The inclusion criteria were a diagnosis of one of the four primary genotypes of SCD and age of 10-19 years. Health literacy was evaluated using the Newest Vital Sign (NVS). Frequencies and percentages were calculated for all variables. Independent Samples t-tests were conducted to evaluate differences in health literacy scores based upon differing health-seeking behaviors. Results: The mean age of participants was 14.8 years (SD = 2.2). The mean NVS score was 2.7 (SD = 1.6). The two most common responses to "where do you go FIRST for health information?" were the Internet (29.6%; n = 40) and health care providers (27.4%; n = 37). There was no statistical difference in NVS scores between adolescents using the Internet versus health care providers as their first source of health information (t[75] = - .12; p = .22). Discussion: Knowledge of health-seeking behaviors and health literacy in adolescents with SCD gives insight into the design and evaluation of future interventions to improve health and health literacy in this population.

Health Literacy of Adolescents.

PURPOSE: The purpose of this study is to describe influencing factors of adolescent health literacy. METHODS: This study is a descriptive, correlational, cross-sectional study. Based on an a priori power analysis and utilizing convenience sampling, 105 adolescents completed the Newest Vital Sign (NVS) health literacy instrument via the Qualtrics online platform. Health literacy was correlated with potential influencing factors to determine relationships between variables. RESULTS: The mean NVS score was 3.78 (SD = 1.96), indicating possible limited health literacy in this population. There was a moderate, positive correlation between adolescent health literacy and race (r = 0.34, p = .00), with non-white adolescents scoring lower than white adolescents. There was a moderate, positive correlation between adolescent health literacy and income (r = 0.24, p < .05). There were no statistically significant correlations between adolescent health literacy and age or grade level. Regression analysis showed that the overall model accounts for a significant amount of the variance in health literacy scores (F (2, 95) =7.99, p = .001; R2 = 0.144; R2adjusted = 0.126). Race was the only variable that significantly contributed to the model (ß = 1.26; SE(ß) = 0.40; Standardized ß = 0.30, p < .01). CONCLUSIONS: This study adds to the paucity of adolescent health literacy literature. Furthermore, this study indicates that race and income may play significant roles in adolescent health literacy. Future research is needed to further investigate influencing factors of adolescent health literacy. PRACTICE IMPLICATIONS: This article provides unique information for nurses to consider alongside other individualized assessments as they continue to design health promotion and patient education practices for adolescents.

Health literacy in adolescents with sickle cell disease: The influence of caregiver health literacy.

PURPOSE: After patients with sickle cell disease (SCD) transfer from pediatric care to adult care, significant morbidity and mortality occurs. There are many possible contributors to the success or failure of this transition. One hypothesis is that health literacy influences this transition from pediatric to adult health care. The purpose of this study was twofold: (a) to examine the relationship between caregiver and adolescent health literacy levels in adolescents with SCD; and (b) to further describe individual traits contributing to health literacy levels in adolescents with SCD as described by pilot data. DESIGN AND METHODS: This cross-sectional, descriptive correlational study included the administration of the newest vital sign (NVS) health literacy instrument to 59 dyads of adolescent patients with SCD and their caregivers in a large, tertiary care center in Dallas, Texas. Convenience sampling was utilized for recruitment. Caregiver health literacy levels, age, current grade level, annual household income, caregiver education level, number of annual healthcare encounters, and adolescent health literacy levels were correlated to determine relationships amongst variables. RESULTS: There was no significant relationship between caregiver and adolescent health literacy levels in this population. Adolescent health literacy NVS scores were positively correlated with adolescent age, r(58) = .468, p < .001, caregiver income, r(46) = .293, p = .023, and caregiver highest education level, r(56) = .318, p = .008. Only adolescent age was a significant predictor of adolescent health literacy NVS scores, ß = .485 (standard error [SE] = .109), p = .001. None of the other predictors in the model were significant, including the relationship between caregiver and adolescent health literacy NVS scores, ß = .065 (SE = .131), p = .633. In addition, although caregiver income and highest education level were positively correlated with adolescent health literacy NVS scores in the bivariate analysis, these relationships were nonsignificant while controlling for each other, adolescent age, and the other variables in the model. PRACTICE IMPLICATIONS: This study gives insight on potential practice and research initiatives to evaluate the health literacy of adolescents, with and without SCD, both now and in the future.

The influence of health literacy on emergency department utilization and hospitalizations in adolescents with sickle cell disease.

OBJECTIVE: Healthcare spending in the US is $3.2 trillion. $1.1 trillion is attributed to hospital care, including emergency department (ED) visits and hospitalizations. There is a relationship between ED utilization, hospitalizations, and health literacy in the general population. Health literacy may play a role in frequent ED visits and hospitalizations in patients with sickle cell disease (SCD). The purpose of this paper is to describe the relationship among health literacy levels, annual hospital encounters, annual clinic visits, annual ED visits, and annual hospitalizations in 134 Black, non-Hispanic adolescents aged 10-19 years with SCD. DESIGN: This is a cross-sectional, descriptive correlational study evaluating facilitators and barriers to health literacy and clinical outcomes in adolescents with SCD. SAMPLE: Data were collected from 134 Black, non-Hispanic adolescents with SCD at a large, tertiary care center in Texas. MEASUREMENTS: The Newest Vital Sign and REALM-Teen health literacy instruments were used to evaluate health literacy. RESULTS: Contrasting previous studies evaluating the influence of health literacy on ED visits and hospitalizations in the general population, there were no significant relationships within this sample. CONCLUSIONS: This study gives insight into future research to evaluate other potential influences on ED utilization and hospitalizations in pediatric patients with SCD.

A pre-post evaluation of a knowledge translation capacity-building intervention.

BACKGROUND/AIM: Knowledge translation (KT) aims to reduce research-practice gaps. Few studies have investigated methods to build clinicians' capacity for KT. To: (i) evaluate the impact of a multifaceted KT capacity-building intervention; (ii) understand barriers and enablers to clinicians' use of KT; and (iii) identify useful strategies. METHODS: A pre-post study to develop KT capacity amongst occupational therapy clinicians (n = 46) in a large metropolitan hospital. A customised questionaire (baseline and 18 months) identified KT-related behaviours and barriers and enablers guided by the Theoretical Domains Framework (TDF). McNemar's tests and Wilcoxon signed rank tests were completed on matched data (n = 20). At follow-up additional items explored perceptions of change and usefulness of strategies. RESULTS: At follow-up, participants had read more clinical guidelines (10 vs. 17) and more participants reported using strategies to increase the use of recommended clinical practices (P = 0.006). The main barriers at baseline were from the TDF domains of 'attention, memory and decision processes', 'knowledge' and 'environmental context and resources', while main enablers were from 'social/professional role and identity', 'reinforcement', 'social influence' and 'beliefs about consequences' domains. At follow-up, significant improvements were seen in 'knowledge' (p < 0.001), 'environmental context & resources' (P < 0.001), 'skills' (P = 0.008) 'beliefs about consequences' (P = 0.011), 'beliefs about capabilities' (P = 0.018), and 'memory, attention & decision processes' (P = 0.048) and participants agreed that KT had become part of the departments' culture. Strategies perceived most useful included working as a team, having a dedicated staff member, mentoring meetings, department leader support, learning about KT over time, and training sessions. CONCLUSIONS: The KT capacity-building intervention changed one clinician-reported behaviour and perceived impact of barriers across six domains. Clinicians reported perceived improvement in understanding of - and confidence in - KT, and changes in the culture to one of engaging with KT as part of clinical practice. Further research into KT capacity building is needed.

The Use of the Newest Vital Sign Health Literacy Instrument in Adolescents With Sickle Cell Disease.

The purpose of this article is to discuss the use of the Newest Vital Sign (NVS) health literacy instrument in adolescents with sickle cell disease. The NVS evaluates both literacy and numeracy (the ability to understand and work with numbers) as well as the ability to locate and apply information. It is important to validate the NVS for use in adolescents, as the only currently validated instrument, the Rapid Estimate of Adolescent Literacy in Medicine-Teen (REALM-Teen), does not measure numeracy or the ability to locate or apply information. This cross-sectional, descriptive, exploratory correlational study included appraisal of data from completion of the REALM-Teen and NVS instruments by a convenience sample of 75 adolescents with sickle cell disease. The mean age of this study sample was 14.7 years ( SD = 2.2). The mean grade level of participants was 8.7 ( SD = 2.2). Internal consistency for the NVS in this population was acceptable (α = .63). Criterion validity was based on correlations between raw scores on the NVS and raw scores on the REALM-Teen. There was a significant moderate, positive correlation between NVS and REALM-Teen scores ( r = .38, p < .01), demonstrating good criterion validity. Preliminary evidence for reliability and validity of the NVS in this population was established.

Liquefied gas electrolytes for electrochemical energy storage devices.

Electrochemical capacitors and lithium-ion batteries have seen little change in their electrolyte chemistry since their commercialization, which has limited improvements in device performance. Combining superior physical and chemical properties and a high dielectric-fluidity factor, the use of electrolytes based on solvent systems that exclusively use components that are typically gaseous under standard conditions show a wide potential window of stability and excellent performance over an extended temperature range. Electrochemical capacitors using difluoromethane show outstanding performance from -78° to +65°C, with an increased operation voltage. The use of fluoromethane shows a high coulombic efficiency of ~97% for cycling lithium metal anodes, together with good cyclability of a 4-volt lithium cobalt oxide cathode and operation as low as -60°C, with excellent capacity retention.

Vertical Si nanowire arrays fabricated by magnetically guided metal-assisted chemical etching.

In this work, vertically aligned Si nanowire arrays were fabricated by magnetically guided metal-assisted directional chemical etching. Using an anodized aluminum oxide template as a shadow mask, nanoscale Ni dot arrays were fabricated on an Si wafer to serve as a mask to protect the Si during the etching. For the magnetically guided chemical etching, we deposited a tri-layer metal catalyst (Au/Fe/Au) in a Swiss-cheese configuration and etched the sample under the magnetic field to improve the directionality of the Si nanowire etching and increase the etching rate along the vertical direction. After the etching, the nanowires were dried with minimal surface-tension-induced aggregation by utilizing a supercritical CO2 drying procedure. High-resolution transmission electron microscopy (HR-TEM) analysis confirmed the formation of single-crystal Si nanowires. The method developed here for producing vertically aligned Si nanowire arrays could find a wide range of applications in electrochemical and electronic devices.

Building capacity for knowledge translation in occupational therapy: learning through participatory action research.

BACKGROUND: There has been widespread acknowledgement of the need to build capacity in knowledge translation however much of the existing work focuses on building capacity amongst researchers rather than with clinicians directly. This paper's aim is to describe a research project for developing a knowledge translation capacity building program for occupational therapy clinicians. METHODS: Participatory action research methods were used to both develop and evaluate the knowledge translation capacity-building program. Participants were occupational therapists from a large metropolitan hospital in Australia. Researchers and clinicians worked together to use the action cycle of the Knowledge to Action Framework to increase use of knowledge translation itself within the department in general, within their clinical teams, and to facilitate knowledge translation becoming part of the department's culture. Barriers and enablers to using knowledge translation were identified through a survey based on the Theoretical Domains Framework and through focus groups. Multiple interventions were used to develop a knowledge translation capacity-building program. RESULTS: Fifty-two occupational therapists participated initially, but only 20 across the first 18 months of the project. Barriers and enablers were identified across all domains of the Theoretical Domains Framework. Interventions selected to address these barriers or facilitate enablers were categorised into ten different categories: educational outreach; teams working on clinical knowledge translation case studies; identifying time blocks for knowledge translation; mentoring; leadership strategies; communication strategies; documentation and resources to support knowledge translation; funding a knowledge translation champion one day per week; setting goals for knowledge translation; and knowledge translation reporting strategies. Use of these strategies was, and continues to be monitored. Participants continue to be actively involved in learning and shaping the knowledge translation program across the department and within their specific clinical areas. CONCLUSION: To build capacity for knowledge translation, it is important to involve clinicians. The action cycle of the Knowledge to Action framework is a useful guide to introduce the knowledge translation process to clinicians. It may be used to engage the department as a whole, and facilitate the learning and application of knowledge translation within specific clinical areas. Research evaluating this knowledge translation program is being conducted.

Organisational support for evidence-based practice: occupational therapists perceptions.

BACKGROUND: Barriers to the use of evidence-based practice extend beyond the individual clinician and often include organisational barriers. Adoption of systematic organisational support for evidence-based practice in health care is integral to its use. This study aimed to explore the perceptions of occupational therapy staff regarding the influence of organisational initiatives to support evidence-based practice on workplace culture and clinical practice. METHODS: This study used semi-structured interviews with 30 occupational therapists working in a major metropolitan hospital in Brisbane, Australia regarding their perceptions of organisational initiatives designed to support evidence-based practice. RESULTS: Four themes emerged from the data: (i) firmly embedding a culture valuing research and EBP, (ii) aligning professional identity with the Research and Evidence in Practice model, (iii) experiences of change: pride, confidence and pressure and (iv) making evidence-based changes to clinical practices. CONCLUSION: Organisational initiatives for evidence-based practice were perceived as influencing the culture of the workplace, therapists' sense of identity as clinicians, and as contributing to changes in clinical practice. It is therefore important to consider organisational factors when attempting to increase the use of evidence in practice.

Which leaf mechanical traits correlate with insect herbivory among feeding guilds?

BACKGROUND AND AIMS: There is abundant evidence that leaf mechanical traits deter feeding by insect herbivores, but little is known about which particular traits contribute to defence across feeding guilds. We investigated the contribution of multiple mechanical traits from shear, punch and tear tests to herbivore deterrence across feeding guilds. METHODS: Visible damage from miners and external chewers was measured and sucker feeding density estimated in mature leaves of 20 species of forest shrubs and small trees. Cafeteria trials were undertaken using a generalist chewer (larvae of Epiphyas postvittana, Lepidoptera). Damage was compared with leaf mechanical traits and associated nutrient and chemical defence traits. KEY RESULTS: Damage by external chewers in the field and by E. postvittana correlated negatively with mechanical traits. Hierarchical partitioning analysis indicated that the strongest independent contribution to chewing damage was by the material trait of specific work to shear, with 68 % of total variance explained by the combination of specific work to shear (alone explaining 54 %) and tannin activity in a regression model. Mining damage did not correlate with mechanical traits, probably because miners can avoid tissues that generate high strength and toughness in mature leaves. Mechanical traits correlated more strongly with chewing damage in the field than chemical defences (total phenolics and tannin activity) and nutrients (nitrogen and water), but nutrients correlated strongly with diet selection in the cafeteria trial. Surprisingly, sucker feeding density correlated positively with mechanical traits and negatively with nutrients. CONCLUSIONS: Mechanical traits of mature leaves influenced insect feeding guilds differentially, reflecting differences in life history and feeding modes. For external chewers, energy (work) to fracture in shearing tests, at both structural and material levels, was strongly predictive of damage. Knowing which leaf mechanical traits influence insect feeding, and in which guilds, is important to our wider understanding of plant-herbivore interactions.

Alcohol self-administration in rats: Modulation by temporal parameters related to repeated mild social defeat stress.

Clinical evidence often points to stress as a cause or an antecedent to the development of drinking problems. Yet, animal models of alcohol drinking have yielded inconsistent evidence for a direct contribution of stress, and many studies have shown that stress suppresses alcohol consumption. The aim of the present study was to examine alcohol reward in animals exposed to repeated, mild social stress, and to determine whether alcohol drinking changes as a function of the temporal parameters of alcohol access relative to the stressor. Male Long-Evans rats, trained to self-administer a 6% (wt/vol) alcohol solution using a sucrose-fading procedure, were exposed to five brief (5min) episodes of contact with an aggressive male. Full contact with the resident was limited to a single episode of defeat, whereas the following four encounters occurred with the subjects behind a protective wire mesh cage. Alcohol self-administration was measured 1 week prior to stress (baseline), on each day of stress exposure, and 1 week following stress. Separate groups of animals were randomly assigned to self-administer alcohol immediately prior, immediately following, or 2h following defeat stress. Stress preferentially increased alcohol drinking on stress-exposure days, and further elevated the amount consumed 1 week following stress. Temporal parameters of alcohol access relative to the stressor were found to be important. Average alcohol consumption was greatest for animals drinking 2h postdefeat, whereas animals drinking immediately prior to or following the stressor did not show a significant increase in alcohol consumption. Results suggest that mild social defeat stress is sufficient to elicit increases in alcohol consumption in nonpreferring strains of rodents, provided alcohol access occurs at an optimal time interval after the social defeat experience.