Associations between sexual stigma, enacted HIV stigma, internalized HIV stigma and homonegativity, and depression: testing an extended minority stress model among men who have sex with men living with HIV in India.

Limited data is available on the associations between intersectional stigmas and mental health outcomes among men who have sex with men living with HIV (MSMLH) in India. The minority stress model postulates that sexual stigma contributes to depression through proximal stressors like internalized homonegativity (IHN). Using cross-sectional survey data from 119 MSMLH in 2015/16, we tested whether: (1) sexual stigma and enacted HIV stigma (EHS) are associated with depression; (2) their effects on depression are mediated through IHN and internalized HIV stigma (IHS); and (3) their effects on IHN are mediated through IHS. Significant direct associations were observed between scores on sexual stigma and IHS (ß = .49, 95% CI .27, .70), EHS and IHN (ß = .19, 95% CI .03, .36), and IHS and IHN (ß = .07, 95% CI .03, .12). IHS scores mediated the associations of sexual stigma with depression (ß = .17, 95% CI .07, .27) and IHN scores (ß = .04, 95% CI .004, .07). EHS was not found to be significantly associated with depression or IHN. The findings partially support the minority stress model among MSMLH and highlight the importance of addressing both sexual and HIV-related stigmas to improve mental health of MSMLH, especially by screening for and reducing IHS, IHN and depression.

Short term atmospheric pressure cold plasma treatment: A novel strategy for enhancing the substrate utilization in a thermophile, Geobacillus sp. strain WSUCF1.

The aim of this study was to investigate the effect of atmospheric pressure cold plasma on the microbial substrate utilization and biomass yield in a thermophilic strain. Geobacillus sp. strain WSUCF1, a thermophile capable of producing cellulolytic enzymes with higher activity was used for this investigation. Treatment with cold plasma for 4 min increased the rates of glucose utilization by 74% and biomass yield by 60% when compared with the control. WSUCF1 treated with plasma also displayed enhanced biofilm formation. This study for the first time, reports the use of cold plasma for enhancing the substrate utilization and biofilm formation in a thermophile.