Stripes and Superconductivity in Cuprates

Holes doped into the CuO2 planes of cuprate parent compounds frustrate the antiferromagnetic order. The development of spin and charge stripes provides a compromise between the competing magnetic and kinetic energies. Static stripe order has been observed only in certain particular compounds, but there are signatures which suggest that dynamic stripe correlations are common in the cuprates. Though stripe order is bad for superconducting phase coherence, stripes are compatible with strong pairing. Ironically, magnetic-field-induced stripe order appears to enhance the stability of superconducting order within the planes.Comment: 6 pages, submitted to proceedings of ECRYS-201

Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1−x_{1-x}Cox_x)2_2As2_2

Ba(Ni$_{1-x}$Co$_x$)$_2$As$_2$ is a structural homologue of the pnictide high temperature superconductor, Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$, in which the Fe atoms are replaced by Ni. Superconductivity is highly suppressed in this system, reaching a maximum $T_c$ = 2.3 K, compared to 24 K in its iron-based cousin, and the origin of this $T_c$ suppression is not known. Using x-ray scattering, we show that Ba(Ni$_{1-x}$Co$_x$)$_2$As$_2$ exhibits a unidirectional charge density wave (CDW) at its triclinic phase transition. The CDW is incommensurate, exhibits a sizable lattice distortion, and is accompanied by the appearance of $\alpha$ Fermi surface pockets in photoemission [B. Zhou et al., Phys. Rev. B 83, 035110 (2011)], suggesting it forms by an unconventional mechanism. Co doping suppresses the CDW, paralleling the behavior of antiferromagnetism in iron-based superconductors. Our study demonstrates that pnictide superconductors can exhibit competing CDW order, which may be the origin of $T_c$ suppression in this system

Psychopathology Subgroups and HIV Risk Among Women in Psychiatric Treatment

Among individuals with mental illness, the HIV infection rate is generally found to be substantially higher than in the general population. Understanding dimensions or subtypes of psychopathology linked with HIV risk behavior may enable development of targeted interventions to reduce HIV transmission. This study identified subgroups of women (n = 243) receiving outpatient psychiatric treatment based upon cluster analysis of indices of personality disorder and clinical symptom syndromes. High, medium, and low psychiatric severity cluster subgroups were found to differ significantly on key HIV risk variables. The high psychopathology subgroup revealed greater AIDS anxiety, more sexual partners, more sexual trading behaviors, less risk reduction self-efficacy, and less skill in condom usage than was found in one or both cluster subgroups characterized by less psychiatric severity. Results suggest that subgroups differentiated on the basis of levels of personality disorder and clinical symptom severity display differences in types and levels of HIV risk-related attitudes, beliefs, expectancies, skills, and behaviors that might guide development of tailored prevention intervention

1650. Knowledge and Attitudes Toward Influenza Vaccination Among Hispanics: A Survey Conducted in Latin American Consulates in South Florida

Abstract Background Each year Influenza causes between 12,000 and 56,000 deaths, and over half a million of hospitalizations in the United States. Despite the widespread availability of vaccination, immunization coverage is low. Less than half of American adults receive the influenza vaccine, and there is a disparity between Hispanic and non-Hispanics, with only 35.9% of Hispanic compared with 45.9% of white non-Hispanics receiving the vaccine. In Miami, South Florida, over two-thirds of the population is Hispanic, and rates of influenza vaccination are low. This study aims to identify the knowledge and attitudes toward influenza vaccination among members of the adult Hispanic community in Miami, and to identify barriers to vaccination in this population. Methods This is a cross-sectional study conducted during the influenza season in 2017 and 2019 (October to December). A survey was administered in the waiting rooms of participating Latin American Consulates (Argentina, Colombia, Ecuador, Guatemala, Honduras, Mexico, Peru, and Uruguay) in Miami. Participants included were older than 18 years, Hispanic, and with residence in the United States for more than 6 months. The participants accepted the inform consent orally. The survey was voluntary and anonymous. Results We enrolled 970 adults. The median age was 43 years, 50% were male, 60% had health insurance, and 67% had completed education of high school or higher. Knowledge regarding influenza and vaccination was low (78% believed asymptomatic individuals could transmit influenza, 14% knew that vaccination is recommended during the winter months, 50% felt not everyone should be vaccinated, 25% believed the vaccine causes influenza, and 7% autism). About one quarter (27%) received the influenza vaccine annually, 35% sometimes, and 38% never. Using multinomial logistic regression, we identified age χ2(2) = 19.38, P < 0.001, consulate χ2(6) = 160.21, P < 0.001, and insurance status χ2(2) = 23.04, P < 0.001 as predictors of receiving vaccination. Neither gender, nor education level found to be associated with vaccination behavior. Conclusion Immunization rates in the adult Hispanic population are low. Interventions to improve vaccination among Hispanics who are older and lack of health insurance are urgently needed in the diverse Hispanic community. Disclosures All authors: No reported disclosures

Heart Health and Behavior Change in HIV-Infected Individuals

Management of cardiovascular disease risk requires many lifestyle changes involving diet, smoking, and exercise. Individuals with arterial plaque are encouraged to adopt these changes to promote longevity through a variety of interventions. This study examined behavioral changes in response to the standard of care after detection of arterial plaque, specifically among HIV-infected cocaine users. 127 individuals (HIV - COC - n = 43, HIV + COC - n = 19, HIV + COC + n = 35, HIV - COC + n = 30) were followed after a standard of care intervention and assessed 1 and 2 years later on a variety of lifestyle (diet, exercise, smoking) and physiological (blood pressure, body mass index, number of arterial plaques) outcomes. Arterial plaque was found to increase over time (b = 0.003, SE = 0.002, p = .031), and a composite measure of cardiovascular disease risk did not change (b = - 0.004, SE = 0.01, p = .548). Following provision of a standard of care cardiovascular risk reduction intervention, important health behaviors related to CVD risk were resistant to change among both those HIV-infected and uninfected and among cocaine users and non-users

Social Support, Relationship Power, and Knowledge of HIV+ Serostatus in Sexual Risk Behavior Among Women in Psychiatric Treatment

This study examined social support, perceived relationship power, and knowledge of HIV+ serostatus in relation to frequency of unprotected sex acts and number of partners among women with comorbid psychiatric illness receiving treatment. Data were drawn from an initial assessment of participants enrolled in an HIV risk reduction intervention (N = 284), and two generalized linear models were used to examine the potential associations. Relationship power was significantly associated with fewer unprotected sex acts. This relationship was stronger among those with greater social support. Knowledge of HIV+ serostatus was linked with fewer sexual partners and less unprotected sex. Findings also revealed that the protective nature of support varies by level of perceived relationship power, with higher power indicative of a stronger protective relationship. Study findings suggest that the potential protective benefits of social support may depend on one's perceived relationship power. Implications for HIV prevention intervention for this at-risk group are discussed

Psychological and physical intimate partner violence and sexual risk behavior among South African couples: a dyadic analysis

This study aimed to examine intimate partner violence (IPV) as it relates to both partners' perceptions of IPV and sexual behaviors, considering how their IPV might be interdependent within the relationship dynamics. The sample consisted of 713 female-male dyads in which women were pregnant and living with HIV in rural South Africa. Using an actor-partner interdependence model (APIM), we examined the interdependent influence of psychological and physical IPV on men by their female partners and psychological and physical IPV on women by their male partners on sexual risk behavior. The APIM model found there were no actor (b = −0.06, SE = 0.05, p = .221) or partner (b = −1.2, SE = 0.06, p = .056) effects contributing to protected sex by female IPV victimization. In contrast, significant actor (b = −0.28, SE = 0.06, p < .001) and partner (b = −0.29, SE = 0.06, p < .001) effects for protection were related to male IPV victimization. The model also found that the covariate of female HIV disclosure was associated with both male (b = 0.5, SE = 0.12, p < .001) and female protected sexual intercourse (b = 0.58, SE = 0.1, p < .001). Female HIV disclosure was related to an increased likelihood of protected sex by both male and female partners. As male partners reported more IPV victimization, the likelihood of protected sex between male and female partners decreased.Trial registration: ClinicalTrials.gov identifier: NCT02085356

The effect of male involvement and a prevention of mother-to-child transmission (PMTCT) intervention on depressive symptoms in perinatal HIV-infected rural South African women

This study investigated perinatal depressive symptoms among HIV-infected women enrolled in a cluster-randomized, controlled trial in South Africa. Women (n = 1370) attending 12 community health centers were consecutively enrolled in a two-phase (phase 1 = without a male partner, phase 2 = with a male partner) and two-condition (experimental or control) prevention of mother-to-child transmission (PMTCT) intervention. Women were enrolled at 8-24 weeks pregnant and followed postpartum at 6 weeks and 6 and 12 months (retention rate = 69.8%). Antenatally, 45.4% of women were above the 12-point Edinburgh Postnatal Depression Scale (EPDS) cutoff, 30.2% were above the cutoff at 6 weeks, and 34.2% and 36.9% at 6 months and 12 months postpartum, respectively. In multilevel regression analyses, depressive symptoms decreased over time among women in phase 2 participating in the intervention condition, but neither condition nor phase alone was associated with a decrease in depression. Greater HIV stigma, increased psychological intimate partner violence, less male involvement, lower education, and non-adherence during pregnancy were associated with increased depressive symptoms over the perinatal period. Results indicated that women participating had high levels of depressive symptoms (> 40% prenatally and > 30% postnatally), and the combination of the multi-session PMTCT intervention plus male partner participation contributed to a reduction in depressive symptoms. Results suggest that interventions targeting the reduction of depressive symptoms in perinatal HIV-positive women by increasing male involvement and decreasing HIV stigma and intimate partner violence are needed to reduce depression in this vulnerable population