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Introduction: Investigating drug trends among Australian gay and bisexual men (GBM) is crucial for understanding levels of use and the potential for harm, including HIV transmission risk. Method: Using repeated, national, cross‐sectional survey data collected between 2012 and 2021 (69,567 surveys), trends of recent (previous 6 months) and frequent (weekly) drug use were analysed, using logistic regression models. The last round of data from each jurisdiction (6709 surveys) was used to compare GBM who reported no use, infrequent (less than weekly) use and frequent (at least weekly) use of party drugs to investigate the association between party drug use and HIV transmission risk, using multinomial logistic regression models. Results: There was a significant upward trend in any recent drug use (from 58.4% in 2012 to 64.1% in 2021; p < 0.001). Frequent party drug use remained a minority practice over the period (consistently less than 3%). In cross‐sectional analysis, frequent party drug users were more likely to report behaviours with HIV transmission risks, such as condomless anal intercourse without biomedical prevention strategies (30.0% vs. 13.1%; adjusted relative risk ratio [aRRR], 2.08; 95% CI, 1.24–3.47), weekly group sex (16.3% vs. 0.6%; aRRR, 12.36; 95% CI, 5.75–26.56) and more than 20 recent sexual partners (42.5% vs. 5.0%; aRRR, 21.44; 95% CI, 5.82–78.89), compared with GBM who did not use party drugs. Discussion and Conclusion: Our findings suggest that the frequent use of party drugs remains a marker of HIV transmission risk among Australian GBM, despite the increased adoption of biomedical HIV prevention strategies over the past few years. [ABSTRACT FROM AUTHOR]

Introduction: Overseas‐born gay and bisexual men (GBM) are overrepresented in HIV diagnoses in Australia. We assessed social and sexual behaviours, and the use of HIV prevention and testing, by region of birth and length of residence in Australia. We sought to identify similarities and differences between recently arrived and non‐recently arrived GBM from non‐English‐speaking countries to improve targeting and engagement with HIV testing and prevention. Methods: Data were collected in national repeated, behavioural surveillance surveys conducted across Australia during 2019–2021. Logistic regression was used to identify factors that differentiated between recently arrived (<2 years) and non‐recently arrived (≥2 years in Australia) GBM from non‐English‐speaking countries. Results: Among 24,707 participants in 2019–21, 2811 (11.4%) were from high‐income English‐speaking countries, 714 (2.9%) were recently arrived overseas‐born GBM and 3833 (15.5%) were non‐recently arrived migrants. Recently arrived GBM were most likely to be born in Asia (36.1%) and Europe (21.1%). Compared with non‐recently arrived GBM, recently arrived GBM from non‐English‐speaking countries were younger (aOR = 0.95, 95% CI = 0.94–0.96, p<0.001), more likely to be students (aOR = 1.43, 95% CI = 1.11–1.85, p = 0.005), less likely to be in full‐time employment (aOR = 0.56, 95% CI = 0.46–0.69, p <0.001), more likely to report consistent condom use (aOR = 1.30, 95% CI = 1.01–1.66, p = 0.039), but had lower awareness (aOR = 0.62, 95% CI = 0.48–0.80, p<0.001) and use of pre‐exposure prophylaxis (PrEP) (22.8%, vs. 32.3%, χ2(1, 4185) = 23.78, p<0.001), and similar levels of casual sex with a risk of HIV acquisition or transmission (aOR = 1.29, 95% CI = 0.98–1.69, p = 0.066). Recently arrived GBM reported similar levels of lifetime HIV testing (aOR = 0.97, 95% CI = 0.54–1.74, p = 0.915) and recent HIV testing (OR = 1.03, 95% CI = 0.86–1.22, p = 0.779), but were much less likely to have tested at general practitioners (aOR = 0.53, 95% CI = 0.41–0.68, p<0.001) and more likely to report testing at hospitals (aOR = 3.35, 95% CI = 2.53–4.43, p<0.001), at home (aOR = 2.85, 95% CI = 1.63–4.99, p<0.001), or community‐based services (aOR = 1.36, 95% CI = 1.01–1.84, p = 0.043). Conclusions: Recently arrived GBM from non‐English‐speaking countries reported similar levels of risk of HIV acquisition to longer‐term residents in Australia, but lower levels of PrEP awareness and use, and more reliance on HIV testing services which are free or low cost. It is necessary to enhance access to HIV testing and prevention among recently arrived GBM in Australia. [ABSTRACT FROM AUTHOR]

Maintaining routines of medication dosing requires effort amidst the variabilities of everyday life. This article offers a sociomaterial analysis of how the oral HIV prevention regimen, pre‐exposure prophylaxis (PrEP), is put to use and made to work, including in situations which disrupt or complicate dosing regimes. Other than a daily pill, PrEP can be taken less frequently based on anticipated sexual activity and HIV risk, including 'on‐demand' and 'periodic' dosing. Drawing on 40 interviews with PrEP users in Australia in 2022, we explore PrEP and its dosing as features of assemblages in which bodies, routines, desires, material objects and the home environment interact. Dosing emerges as a practice of coordination involving dosette boxes, blister packs, alarms, partners, pets, planning sex, routines and domestic space, and as an effect of experimentations with timing to suit life circumstances and manage side effects. Dosing is materialised in the mundane; a practice that is made to work, as well as domesticated, in its situations. Although there are no 'simple' solutions to adherence, our analysis offers practical insights into how routine, planning and experimentation come together to capacitate PrEP to work in people's lives, in sometimes unexpected ways, including through adaptations of PrEP dosing. [ABSTRACT FROM AUTHOR]

The discovery of topological Hall effect (THE) has important implications for next‐generation high‐density nonvolatile memories, energy‐efficient nanoelectronics, and spintronic devices. Both real‐space topological spin configurations and two anomalous Hall effects (AHE) with opposite polarity due to two magnetic phases have been proposed for THE‐like feature in SrRuO3 (SRO) films. In this work, SRO thin films with and without THE‐like features are systematically Investigated to decipher the origin of the THE feature. Magnetic measurement reveals the coexistence of two magnetic phases of different coercivity (Hc) in both the films, but the hump feature cannot be explained by the two channel AHE model based on these two magnetic phases. In fact, the AHE is mainly governed by the magnetic phase with higher Hc. A diffusive Berry phase transition model is proposed to explain the THE feature. The coexistence of two Berry phases with opposite signs over a narrow temperature range in the high Hc magnetic phase can explain the THE like feature. Such a coexistence of two Berry phases is due to the strong local structural tilt and microstructure variation in the thinner films. This work provides an insight between structure/micro structure and THE like features in SRO epitaxial thin films. [ABSTRACT FROM AUTHOR]

Objectives: To compare the usability and acceptability of oral fluid-and blood-based HIV self-test kits among men who have sex with men in Australia. Design: Randomised crossover trial. Setting, participants: Gay, bisexual, and other men aged 18 years or older who have sex with men, who attended two metropolitan sexual health clinics in Sydney and Melbourne, 7 January-10 December 2019. Main outcome measures: Ease of use of HIV self-test kits; preferred HIV self-test type; difficulties encountered during HIV self-testing. Results: 170 men were recruited (median age, 34 years; interquartile range, 29-43 years); 144 identified as gay (85%), 96 were born outside Australia (57%). Participants were more likely to report the oral fluid HIV self-test was easy to use than the blood-based self-test (oral fluid, 99%; blood, 86%; odds ratio [OR], 3.0; 95% confidence interval [CI], 1.4-6.6). The oral fluid test was preferred by 98 participants (58%; 95% CI, 50-65%), the blood-based test by 69 (41%; 95% CI, 33-48%). Difficulties with the oral fluid test kit identified by observing nurses included problems placing the buffer solution into the stand (40 of 170 participants, 24%) and not swabbing both gums (23 of 169, 14%); difficulties with the blood-based test kit included problems filling the device test channel (69 of 170, 41%) and squeezing the finger firmly enough to generate a blood drop (42 of 170, 25%). No participant received an invalid result with the oral fluid self-test; two of 162 participants (1%) received invalid results with the blood self-test. After adjusting for age, education level, and ethnic background, characteristics associated with higher odds of using HIV self-testing in the future were overseas birth (adjusted OR, 3.07; 95% CI, 1.42-6.64), and self-evaluated ease of use and confidence in using the kits. Conclusion: It is important to provide options for obtaining both oral fluid-and blood-based HIV self-tests. The usability and acceptability of both kits were high, but the ease of use and perceived accuracy influenced test kit preference. [ABSTRACT FROM AUTHOR]

New medicines can transform routines and priorities in clinical practice, but how do clinicians think and feel about these changes, and how does it affect their work? In Australia, the HIV prevention regimen pre‐exposure prophylaxis (PrEP) has been rapidly rolled out, transforming the sexual cultures and practices of users, but less attention has been given to the ways PrEP has reconfigured clinical practice. This paper draws on 28 qualitative semi‐structured interviews conducted between 2019 and 2020 with PrEP‐providing doctors and nurses in Australia to consider how they have affectively engaged with PrEP and put it into practice. Through a reflexive thematic analysis, we explore how clinicians adapted to PrEP, how the field of HIV prevention has been transformed, and how these developments have changed how clinicians approach patients. While the introduction of PrEP was initially received with uncertainty and shock, clinicians described PrEP as enjoyable to prescribe, and better aligned with the moral duties of sexual health consultations than existing HIV prevention strategies like condoms. Through approaching clinical work as an 'affective practice', we argue for attending not only to how new interventions change expectations and practices, but also how these changes are felt and valued by clinicians. [ABSTRACT FROM AUTHOR]

Introduction: Substance use disorders are more prevalent among lesbian, gay, bisexual, transgender and queer (LGBTQ) people than among their heterosexual and cisgender peers. There has been limited alcohol and other drug (AOD) treatment research with LGBTQ people outside of North America. This study aimed to examine the treatment outcomes of clients attending a LGBTQ‐specific AOD counselling service in Australia (ACON's Substance Support Service) and compare their client profile and treatment outcomes with LGBTQ and non‐LGBTQ clients of similar mainstream services. Methods: This study was a retrospective analysis of the health records of 284 ACON clients and 1011 clients of five mainstream services in 2016–2018. Clients completed clinical interviews at treatment entry and periodically throughout treatment and completed measures of substance use, severity of dependence, psychological distress and quality of life. Results: Most ACON clients were seeking treatment for methamphetamine (58%) and alcohol use (26%). Among ACON clients, there were reductions in past month days of substance use and severity of dependence between treatment entry and counselling sessions 4, 8 and 12 (all P < 0.001). There were statistically significant reductions in psychological distress and improved quality of life among ACON clients. Despite ACON and the mainstream services having similar treatment approaches, their client profiles were markedly different in terms of sociodemographic characteristics, substance use and source of referral, which precluded comparison of treatment outcomes. Discussion and Conclusions: ACON's clients showed reduced substance use and improved psychosocial wellbeing during treatment. The findings support the provision of LGBTQ‐specific AOD services. [ABSTRACT FROM AUTHOR]

Correlative X‐ray microscopy, including synchrotron X‐ray diffraction and fluorescence, is leveraged to understand the local role of europium as a B‐site additive in CsPbBr3 perovskite crystals. Europium addition reduces microstrain in the perovskite, despite the fact that the degree of europium incorporation into the perovskite varies locally, with a maximum loading over twice the nominal stoichiometry. The presence of europium improves photoluminescence yield and bandwidth, while shifting the emission to bluer wavelengths. Finally, europium‐containing crystals have greatly improved X‐ray hardness. The findings show promise for europium as an additive in perovskite optoelectronic devices. [ABSTRACT FROM AUTHOR]

Hard X‐ray nanodiffraction provides a unique nondestructive technique to quantify local strain and structural inhomogeneities at nanometer length scales. However, sample mosaicity and phase separation can result in a complex diffraction pattern that can make it challenging to quantify nanoscale structural distortions. In this work, a k‐means clustering algorithm was utilized to identify local maxima of intensity by partitioning diffraction data in a three‐dimensional feature space of detector coordinates and intensity. This technique has been applied to X‐ray nanodiffraction measurements of a patterned ferroelectric PbZr0.2Ti0.8O3 sample. The analysis reveals the presence of two phases in the sample with different lattice parameters. A highly heterogeneous distribution of lattice parameters with a variation of 0.02 Å was also observed within one ferroelectric domain. This approach provides a nanoscale survey of subtle structural distortions as well as phase separation in ferroelectric domains in a patterned sample. [ABSTRACT FROM AUTHOR]

Background: Men who have sex with men in Australia are currently ineligible to donate blood (are "deferred") for 12 months since last oral or anal sexual contact with another man. In Australia and overseas, there has been limited research on attitudes and perceptions related to blood donation in this population.Study Design and Methods: Questions on blood donation histories and attitudes toward the deferral policy were included in the questionnaire of an online prospective cohort of gay and bisexual men (GBM) living in Australia.Results: In 2018, 1595 GBM responded to the survey. In this sample, 28.7% reported previously donating blood. Among the remaining men who had never donated blood, 64.5% expressed an interest in doing so. Nearly all men indicated they were not willing to abstain from sex with another man for 12 months in order to donate, and the vast majority believed the rule was unfair, too strict, and homophobic. Three-quarters (77.7%) said that if the policy changed, they would likely donate blood. Age and openness about one's sexuality were independently associated with one's willingness to donate blood in the absence of the deferral.Conclusion: There was a high level of willingness and desire to donate blood among GBM. However, rather than abstaining from sex in order to donate, many men comply with the deferral policy and do not donate. A less conservative deferral policy may increase donations from GBM. [ABSTRACT FROM AUTHOR]

HIV pre‐exposure prophylaxis (PrEP) has been embraced in Australia, making PrEP available with public funding to people at risk of HIV. Here, we consider the associated 'problems' of reduced condom use and sexually transmissible infections (STIs), as seen by HIV professionals. Twenty‐one interviews were conducted during May‐August 2017. All agreed that PrEP was a valuable addition to HIV prevention, but their views about reduced condom use and STIs were variable. Using poststructural policy analysis, three main stances were identified: (1) Concerned/alarmed. PrEP was seen as causing reduced condom use, STIs and antibiotic resistance, posing threats to the general population; (2) Neutral/normalising. Stakeholders emphasised that condom use was declining and STIs increasing independently of PrEP, and that PrEP was simply a new tool to be accommodated; (3) Optimistic/critical. PrEP was seen as diminishing fear of HIV and engaging users in more frequent testing and treatment that could lead to declining STI rates. What linked all three stances was the selective performance of evidence, deploying a mixture of personal experience, clinical observations, behavioural data and epidemiology. Anticipating possible futures through evidence‐making suggested practical, political and moral consequences for what PrEP could become. We encourage others to consider these consequences with care. [ABSTRACT FROM AUTHOR]

Abstract: Introduction: The HIV Strategy in New South Wales (NSW) Australia aims to virtually eliminate HIV transmission by 2020. We estimated the 2016 HIV diagnosis and care cascade for the state of NSW, with a focus on introducing population‐based data to improve data quality and assess progress towards the UNAIDS 90‐90‐90 targets. Methods: To estimate the number of people living with diagnosed HIV (PLDHIV) we used NSW data from the Australian National HIV Registry, enhanced by surveillance among people recently diagnosed with HIV to improve migration estimates. The number of undiagnosed PLHIV was estimated using back‐projection modelling by CD4 count at diagnosis. De‐duplicated prescription claims data were obtained from the Australian Pharmaceutical Benefits Scheme (PBS), and were combined with an estimate for those ineligible, to determine the number of PLDHIV on antiretroviral therapy (ART). Data from a clinic network with 87% coverage of PLDHIV in NSW enabled the estimation of the number on ART who had HIV suppression. Results and discussion: We estimated that 10,110 PLHIV resided in NSW in 2016 (range 8400 to 11,720), among whom 9230 (91.3%) were diagnosed, and 8490 (92.0% of those diagnosed) were receiving ART. Among PLDHIV receiving ART, 8020 (94.5%) had suppressed viral load (<200 HIV‐1 RNA copies/mL). Overall, 79.3% of all PLHIV had HIV virological suppression. Conclusion: NSW has met each of the UNAIDS 90‐90‐90 targets. The enhanced surveillance methods and data collection systems improved data quality. Measuring and meeting the 90‐90‐90 targets is feasible and could be achieved in comparable parts of the world. [ABSTRACT FROM AUTHOR]

Abstract: Introduction: We determined the contribution of undiagnosed HIV to new infections among gay and bisexual men (GBM) over a 12‐year period in Australia where there has been increasing focus on improving testing and HIV treatment coverage. Methods: We generated annual estimates for each step of the HIV cascade and the number of new HIV infections for GBM in Australia over 2004 to 2015 using relevant national data. Using Bayesian melding we then fitted a quantitative model to the cascade and incidence estimates to infer relative transmission coefficients associated with being undiagnosed, diagnosed and not on ART, on ART with unsuppressed virus, or on ART with suppressed virus. Results: Between 2004 and 2015, we estimated the percentage of GBM with HIV in Australia who were unaware of their status to have decreased from 14.5% to 7.5%. During the same period, there was a substantial increase in the number and proportion of GBM living with HIV on treatment and with suppressed virus, with the number of virally suppressed GBM increasing from around 3900 (30.2% of all GBM living with HIV) in 2004 to around 14,000 (73.7% of all GBM living with HIV) in 2015. Despite the increase in viral suppression, the annual number of new infections rose from around 660 to around 760 over this period. Our results have a wide range due to the uncertainty in the cascade estimates and transmission coefficients. Nevertheless, undiagnosed GBM increasingly appear to contribute to new infections. The proportion of new infections attributable to undiagnosed GBM almost doubled from 33% in 2004 to 59% in 2015. Only a small proportion (<7%) originated from GBM with suppressed virus. Discussion: Our study suggests that an increase in HIV treatment coverage in Australia has reduced the overall risk of HIV transmission from people living with HIV. However, the proportion of infections and the rate of transmission from undiagnosed GBM has increased substantially. These findings highlight the importance of HIV testing and intensified prevention for Australian GBM at high risk of HIV. [ABSTRACT FROM AUTHOR]

Introduction and Aims. International research has shown that gay, bisexual and other homosexually active men (hereafter 'gay men') report disproportionately higher rates of risky alcohol use and associated problems compared with heterosexual men. However, little is known about alcohol use among this population in Australia. This study aimed to examine rates of risky alcohol use among a community-based sample of gay men in Sydney and characteristics of men reporting high-risk alcohol use and adverse consequences. Design and Methods. A cross-sectional survey of gay men was conducted in Sydney in August 2013 as part of the ongoing Gay Community Periodic Surveys (n = 1546 eligible respondents). The Alcohol Use Disorders Identification Test-Consumption questions were used to assess alcohol use in the previous 12 months. Results. Nine percent of respondents were categorised as abstinent from alcohol, 33% as low-risk drinkers, 42% as moderate-risk drinkers and 16% as high-risk drinkers. In separate multivariate logistic regression analyses, high-risk drinking and reporting ≥4 adverse alcohol consequences were associated with younger age, being Australian-born, recruitment from licensed premises and having met men for sex at gay bars and dance parties. Fifty-eight percent of high-risk drinkers reported a desire to reduce their alcohol use. Discussion and Conclusions. In this community-based sample of gay men, we found high levels of moderate- to high-risk alcohol use. The results suggest that gay men should be a priority population for health promotion campaigns and treatment services. [ABSTRACT FROM AUTHOR]

Introduction: Gay and bisexual men (GBM) with undiagnosed HIV are believed to contribute disproportionately to HIV transmission in Australia but national prevalence estimates have been lacking. Methods: From November 2013 to November 2014, we recruited men at gay venues and events in six Australian states and territories. Of 7291 survey participants, 3071 men also provided an oral fluid sample for testing and decided whether to receive their test results or not. We calculated raw and population-weighted prevalence estimates and identified associations with undiagnosed infection using logistic regression. Results: Of 3071 participants, 213 men tested HIV-positive (6.9%, 95% confidence interval [CI] 6.0 to 7.8%), ofwhom19 (8.9%, 95% CI 5.8 to 13.5%) were previously undiagnosed. After weighting for the size of the gay and bisexual male population in each state or territory, national HIV prevalence was estimated to be 7.2% (95% CI 6.3 to 8.1), of which 9.1% (95% CI 6.0 to 13.6%) were estimated to be undiagnosed. Compared with HIV-negative participants, men with undiagnosed HIV were more likely to report meeting partners at sex venues, using antiretroviral drugs as pre-exposure prophylaxis, condomless anal intercourse with casual partners, using party drugs for sex, injecting drugs and using amyl nitrite, crystal methamphetamine or gamma hydroxybutyrate in the six months prior to the survey. Discussion: The results indicate that the prevalence of undiagnosed HIV is relatively low among Australian GBM but is higher among men who report riskier sex and drug practices. Conclusions: The results underline the importance of targeted HIV prevention and frequent testing formen at increased risk of infection. [ABSTRACT FROM AUTHOR]

Introduction HIV diagnoses among gay and bisexual men have increased over the past decade in Australia. HIV point‐of‐care testing (POCT) was introduced in Australia in 2011 as a strategy to increase HIV testing by making the testing process more convenient. We surveyed gay and bisexual men undergoing POCT to assess barriers to HIV testing and characteristics associated with not having previously tested for HIV (never testing). Methods During 2011 and 2012, gay and bisexual men who were undergoing POCT at four Sydney sexual health clinics self‐completed questionnaires assessing testing history and psychological and structural barriers to HIV testing. Bivariate and multivariate logistic regression was used to assess associations between patient characteristics and never testing. Results Of 1093 participants, 981 (89.9%) reported ever testing for HIV and 110 (10.1%) never testing. At least one barrier to testing was reported by 1046 men (95.7%), with only 47 men (4.3%) not reporting any barrier to testing. The most commonly reported barriers to testing were annoyance at having to return for results (30.2%), not having done anything risky (29.6%), stress in waiting for results (28.4%), being afraid of testing positive (27.5%) and having tested recently (23.2%). Never testing was independently associated with being non‐gay‐identified (adjusted odds ratio [AOR]: 1.9; 95% confidence interval [CI]: 1.1–3.2), being aged less than 25 years (AOR: 2.4; 95% CI: 1.6–3.8), living in a suburb with few gay couples (AOR: 1.9; 95% CI: 1.2–3.0), being afraid of testing HIV‐positive (AOR: 1.6; 95% CI: 1.0–2.4), not knowing where to test (AOR: 3.8; 95% CI: 1.3–11.2) and reporting one or no sexual partners in the last six months (AOR: 2.7; 95% CI: 1.2–6.2). Conclusions Barriers to HIV testing were commonly reported among the clinic‐based gay and bisexual men in this study. Our findings suggest further health promotion and prevention strategies are needed to address the knowledge, attitudes and behavioural factors associated with never testing. [ABSTRACT FROM AUTHOR]

Introduction and Aims The findings of Australian drug surveys are typically not stratified by sexual orientation, despite the higher prevalence of drug use generally reported among gay and bisexual men. This paper aims to examine trends in drug use among gay and bisexual men in eastern Australia between 2004 and 2011. Design and Methods Data from the cross-sectional, ongoing Gay Community Periodic Surveys ( GCPS) were used to analyse drug trends among gay and bisexual men in Sydney, Melbourne and Queensland. Between 2004 and 2011, 45 273 eligible questionnaires were completed. Results There was a downward trend in recent drug use (previous 6 months) between 2004 and 2011 from 62.2% to 57.5%. However, this trend was not found among men in Queensland, bisexual men, men aged over 40 years or HIV-positive men. Club drug use peaked in 2006 (45.1%), before steadily declining to 32.4% in 2011. There were significant reductions in use of ecstasy, methamphetamine, ketamine and cannabis, increased use of cocaine, gamma hydroxybutyrate, erectile dysfunction medications, amyl nitrite and lysergic acid diethylamide, and no change in heroin use. Recent injecting drug use fluctuated over time but experienced an overall downward trend from 5.5% in 2004 to 4.0% in 2011. Discussion and Conclusions Drug use trends among gay and bisexual men in Australia are broadly consistent with downward and upward drug trends reported in other Australian drug surveys. The risks associated with drug use in this population and high rates of use supports the ongoing role of the GCPS in monitoring drug trends among homosexually active men. [ABSTRACT FROM AUTHOR]

The Hard X-ray Nanoprobe Beamline (or Nanoprobe Beamline) is an X-ray microscopy facility incorporating diffraction, fluorescence and full-field imaging capabilities designed and operated by the Center for Nanoscale Materials and the Advanced Photon Source at Sector 26 of the Advanced Photon Source at Argonne National Laboratory. This facility was constructed to probe the nanoscale structure of biological, environmental and material sciences samples. The beamline provides intense focused X-rays to the Hard X-ray Nanoprobe (or Nanoprobe) which incorporates Fresnel zone plate optics and a precision laser sensing and control system. The beamline operates over X-ray energies from 3 to 30 keV, enabling studies of most elements in the periodic table, with a particular emphasis on imaging transition metals. [ABSTRACT FROM AUTHOR]

When addressing the use of fish for the environmental safety of chemicals and effluents, there are many opportunities for applying the principles of the 3Rs: Reduce, Refine, and Replace. The current environmental regulatory testing strategy for bioconcentration and secondary poisoning has been reviewed, and alternative approaches that provide useful information are described. Several approaches can be used to reduce the number of fish used in the Organization for Economic Cooperation and Development (OECD) Test Guideline 305, including alternative in vivo test methods such as the dietary accumulation test and the static exposure approach. The best replacement approach would seem to use read-across, chemical grouping, and quantitative structure--activity relationships with an assessment of the key processes in bioconcentration: Adsorption, distribution, metabolism, and excretion. Biomimetic extraction has particular usefulness in addressing bioavailable chemicals and is in some circumstances capable of predicting uptake. Use of alternative organisms such as invertebrates should also be considered. A single cut-off value for molecular weight and size beyond which no absorption will take place cannot be identified. Recommendations for their use in bioaccumulative (B) categorization schemes are provided. Assessment of biotransformation with in vitro assays and in silico approaches holds significant promise. Further research is needed to identify their variability and confidence limits and the ways to use this as a basis to estimate bioconcentration factors. A tiered bioconcentratron testing strategy has been developed taking account of the alternatives discussed. [ABSTRACT FROM AUTHOR]

Following a review of the main approaches to the study of class in the social sciences, a critical/discursive approach is adopted to show how analysing an aspect of everyday life such as leisure and 'going out' can reveal the reproduction of dominant discourses about class. Forty-two middle-class young adults were taken on 'nights out' to bars and pubs and then interviewed later to generate group accounts of the people and places they encountered. An analysis of participants' talk about going out to bars and pubs is used to illustrate the ways in which class was constituted in their dialogue. Focusing on the distinction respondents made between students and locals we consider how working-class people are simultaneously rejected and desired and how a discourse of territoriality defines and reproduces class relations in commercial leisure spaces. We argue that social psychology has much to offer contemporary understandings of the ways in which social class is constituted and mobilized in everyday accounts of leisure and consumption, and discuss our analysis in the context of existing research. We end by considering the potential value of our distinctive method for the study of class relations in social psychology research. [ABSTRACT FROM AUTHOR]

There is generally a lack of saltwater ecotoxicity data for risk assessment purposes, leaving an unknown margin of uncertainty in saltwater assessments that utilize surrogate freshwater data. Consequently, a need for sound scientific advice on the suitability of using freshwater data to extrapolate to saltwater effects exists. Here we use species sensitivity distributions to determine if freshwater datasets are adequately protective of saltwater species assemblages for 21 chemical substances. For ammonia and the metal compounds among these data, freshwater data were generally protective because freshwater organisms tended to be more sensitive. In contrast, for pesticide and narcotic compounds, saltwater species tended to be more sensitive and a suitable uncertainty factor would need to be applied to surrogate freshwater data. Biological and physicochemical factors contribute to such differences in freshwater and saltwater species sensitivities, but the species compositions of datasets used are also important. [ABSTRACT FROM AUTHOR]

This supplement to the Journal of the International AIDS Society focuses on the engagement of the social and political sciences within HIV research and, in particular, maintaining a productive relationship between social and biomedical perspectives on HIV. It responds to a number of concerns raised primarily by social scientists, but also recognized as important by biomedical and public health researchers. These concerns include how best to understand the impact of medical technologies (such as HIV treatments, HIV testing, viral load testing, male circumcision, microbicides, and pre-and post-exposure prophylaxis) on sexual cultures, drug practices, relationships and social networks in different cultural, economic and political contexts. The supplement is also concerned with how we might examine the relationship between HIV prevention and treatment, understand the social and political mobilization required to tackle HIV, and sustain the range of disciplinary approaches needed to inform and guide responses to the global pandemic. The six articles included in the supplement demonstrate the value of fostering high quality social and political research to inform, guide and challenge our collaborative responses to HIV/AIDS. [ABSTRACT FROM AUTHOR]

The article presents information on a case study which investigated a weight-of-evidence (WOE) approach for determining mode of action. The European Centre for Ecotoxicology and Toxicology of Chemicals (ECETOC 2005) has proposed a scheme that may reduce uncertainty in the environmental risk assessment (ERA) of some persistent, bioaccumulative, and toxic (PBT) and very persistent very bioaccumulative (vPvB)-like chemicals. The key to the scheme proposed by ECETOC is an understanding of the mode of action (MOA) of a chemical. Approaches and criteria for assigning mode of action (MOA) are presented.

Threshold concepts of toxicological concern are based on the possibility of establishing an exposure threshold value for chemicals below which no significant risk is to be expected. The objective of the present study is to address environmental thresholds of no toxicological concern for freshwater systems (ETNCaq) for organic chemicals. We analyzed environmental toxicological databases (acute and chronic endpoints) and substance hazard assessments. Lowest numbers and 95th-percentile values were derived using data stratification based on mode of action (MOA; 1 = inert chemicals; 2 = less inert chemicals; 3 = reactive chemicals; 4 = specifically acting chemicals). The ETNCaq values were derived by multiplying the lowest 95th percentile values with appropriate application factors; ETNCaq,MOA1-3 is approximately 0.1 µg/L. A preliminary analysis with complete MOA stratification of the databases shows that in the case of MOA1 or MOA2, the ETNCaq value could be even higher than 0.1 µg/L. A significantly lower ETNCaq,MOA4 value was observed based on the long-term toxicity information in the European Centre for the Ecotoxicology and Toxicology of Chemicals database. Application of the ETNCaq value in a tiered risk-assessment scheme may help chemical producers to set data-generation priorities and to refine or reduce animal use. It also may help to inform downstream users concerning the relative risk associated with their specific uses and be of value in putting environmental monitoring data into a risk-assessment perspective. [ABSTRACT FROM AUTHOR]

Correlative X‐ray microscopy, including synchrotron X‐ray diffraction and fluorescence, is leveraged to understand the local role of europium as a B‐site additive in CsPbBr3 perovskite crystals. Europium addition reduces microstrain in the perovskite, despite the fact that the degree of europium incorporation into the perovskite varies locally, with a maximum loading over twice the nominal stoichiometry. The presence of europium improves photoluminescence yield and bandwidth, while shifting the emission to bluer wavelengths. Finally, europium‐containing crystals have greatly improved X‐ray hardness. The findings show promise for europium as an additive in perovskite optoelectronic devices. [ABSTRACT FROM AUTHOR]