Bioleaching of sulfurous minerals

RESUMEN: Se hizo caracterización mineralógica y química de mineral sulfuroso de bajo tenor proveniente de una mina aurífera localizada en el municipio de Marmato (Caldas), antes y después de un proceso de biolixiviación en el que se empleó un cultivo bacteriano aislado de la mina ¿compatible con Thiobacillus ferrooxidans¿ para medir la efectividad del mismo. Para los bioensayos, realizados en los laboratorios de microbiología y de química del Instituto de Biología y del Departamento de Ingeniería Metalúrgica de la Universidad de Antioquia, se empleó un biorreactor y se consideraron diferentes relaciones líquido/sólido, para estimar variables como población bacteriana, pH, agitación, potencial de oxidorreducción, temperatura y tiempo. Los resultados demostraron una eficiencia máxima de 95%, lo que significa un incremento del 8% de recuperación en relación con el tratamiento único por cianuración

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Psi Chi в глобальном мире: взгляд 9 международных отделений

Since 2009, when Psi Chi became the International Honor Society in Psychology, outstanding faculty and students across many nations have stepped forward to join the Psi Chi family of 750000 life members in 1130 schools on six continents. How is the Psi Chi experience changing lives around the world, as it has been doing since 1929 in the USA? Here, for the first time, Psi Chi “pioneers” in 9 international Chapters share in their own words and images their Psi Chi experiences.С тех пор как в 2009 году Psi Chi стало Международным психологическим обществом почета, выдающиеся преподаватели и студенты из многих стран вступили в семью Psi Chi, которая в настоящее время насчитывает более 750 000 человек, работающих и обучающихся в 1130 учебных заведениях на шести континентах. Меняет ли принадлежность к Psi Chi жизнь людей в глобальном мире, как это происходит в США, начиная с 1929 года? Впервые в этой статье пионеры Psi Chi из девяти международных отделений рассказывают о собственном опыте работы в организации

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Greater Traditionalism Predicts COVID-19 Precautionary Behaviors Across 27 Societies

People vary in the extent to which they embrace their society’s traditions, impacting a range of social and political phenomena. People also vary in the degree to which they perceive disparate dangers as salient and necessitating a response. Over evolutionary time, traditions likely regularly offered direct and indirect avenues for addressing hazards; consequently, via multiple possible pathways, orientations toward tradition and toward danger may have become associated. Emerging research documents connections between individual differences in traditionalism and variation in threat responsivity in general, and pathogen-avoidance motivations in particular. Importantly, because threat-mitigating behaviors can conflict with competing priorities, the precise associations between traditionalism and pathogen avoidance likely depend on contextually contingent costs and benefits. The COVID-19 pandemic requires individuals to make decisions about consequential and costly pathogen-avoidance behaviors that can clash with other priorities. The pandemic therefore provides a real-world setting in which to test the posited relationship between traditionalism and pathogen avoidance across socio-political contexts. Across 27 societies (N = 7,844), we find that costly COVID-19-avoidance behaviors positively correlate with greater endorsement of traditional norms and values in a majority of countries. Accounting for the conflict that arises in some societies between public health precautions and competing priorities, such as the exercise of personal liberties, reveals a consistent relationship between traditionalism and COVID-19 precautions across an even wider range of social and cultural contexts. These findings support the thesis that traditionalism is associated with an enhanced tendency to attend to hazards

Accordance and conflict between religious and scientific precautions against COVID-19 in 27 societies

Meaning-making systems underlie perceptions of the efficacy of threat-mitigating behaviors. Religion and science both offer threat mitigation, yet these two meaning-making systems are often considered incompatible. Do such epistemological conflicts swamp the desire to employ diverse precautions against threats? Or do individuals – particularly individuals who are highly reactive to threats – hedge their bets by using multiple threat-mitigating practices despite their potential epistemological incompatibility? Complicating this question, perceptions of conflict between religion and science likely vary across cultures; likewise, pragmatic features of precautions prescribed by some religions make them incompatible with some scientifically-based precautions. The COVID-19 pandemic elicited diverse precautionary behaviors, and thus provided an opportunity to investigate these questions. Across 27 societies from five continents (N = 7,844), in the majority of countries, individuals’ practice of religious precautions such as prayer correlates positively with their use of scientifically-based precautions. Prior work indicates that greater adherence to tradition likely reflects greater reactivity to threats. Unsurprisingly given associations between many traditions and religion, we find that valuing tradition is predictive of employing religious precautions. However, consonant with its association with threat reactivity, we also find that traditionalism predicts adherence to public health precautions – a pattern that underscores threat-avoidant individuals’ apparent tolerance for epistemological conflict in pursuit of safety

The Coronavirus Anxiety Scale: Cross-National Measurement Invariance and Convergent Validity Evidence

Coronavirus Anxiety Scale (CAS) is a widely used measure that captures somatic symptoms of coronavirus-related anxiety. In a large-scale collaboration spanning 60 countries (Ntotal = 21,513), we examined the CAS’s measurement invariance and assessed the convergent validity of CAS scores in relation to the fear of COVID-19 (FCV-19S) and the satisfaction with life (SWLS-3) scales. We utilized both conventional exact invariance tests and alignment procedures, with results revealing that the single-factor model fit the data well in almost all countries. Partial scalar invariance was supported in a subset of 56 countries. To ensure the robustness of results, given the unbalanced samples, we employed resampling techniques both with and without replacement and found the results were more stable in larger samples. The alignment procedure demonstrated a high degree of measurement invariance with 9% of the parameters exhibiting noninvariance. We also conducted simulations of alignment using the parameters estimated in the current model. Findings demonstrated reliability of the means but indicated challenges in estimating the latent variances. Strong positive correlations between CAS and FCV-19S estimated with all three different approaches were found in most countries. Correlations of CAS and SWLS-3 were weak and negative, but significantly differed from zero in several countries. Overall, the study provided support for the measurement invariance of the CAS and offered evidence of its convergent validity while also highlighting issues with variance estimation

Trust in government moderates the association between fear of COVID-19 as well as empathic concern and preventive behaviour

With the COVID-19 pandemic, behavioural scientists aimed to illuminate reasons why people comply with (or not) large-scale cooperative activities. Here we investigated the motives that underlie support for COVID-19 preventive behaviours in a sample of 12,758 individuals from 34 countries. We hypothesized that the associations of empathic prosocial concern and fear of disease with support towards preventive COVID-19 behaviours would be moderated by trust in the government. Results suggest that the association between fear of disease and support for COVID-19 preventive behaviours was strongest when trust in the government was weak (both at individual- and country-level). Conversely, the association with empathic prosocial concern was strongest when trust in the government was high, but this moderation was only found at individual-level scores of governmental trust. We discuss how motivations may be shaped by socio-cultural context, and outline how findings may contribute to a better understanding of collective action during global crises

The Coronavirus Anxiety Scale: Cross-National Measurement Invariance and Convergent Validity Evidence

Coronavirus Anxiety Scale (CAS) is a widely used measure that captures somatic symptoms of coronavirus-related anxiety. In a large-scale collaboration spanning 60 countries (Ntotal = 21,513), we examined the CAS’s measurement invariance and assessed the convergent validity of CAS scores in relation to the fear of COVID-19 (FCV-19S) and the satisfaction with life (SWLS-3) scales. We utilized both conventional exact invariance tests and alignment procedures, with results revealing that the single-factor model fit the data well in almost all countries. Partial scalar invariance was supported in a subset of 56 countries. To ensure the robustness of results, given the unbalanced samples, we employed resampling techniques both with and without replacement and found the results were more stable in larger samples. The alignment procedure demonstrated a high degree of measurement invariance with 9% of the parameters exhibiting noninvariance. We also conducted simulations of alignment using the parameters estimated in the current model. Findings demonstrated reliability of the means but indicated challenges in estimating the latent variances. Strong positive correlations between CAS and FCV-19S estimated with all three different approaches were found in most countries. Correlations of CAS and SWLS-3 were weak and negative, but significantly differed from zero in several countries. Overall, the study provided support for the measurement invariance of the CAS and offered evidence of its convergent validity while also highlighting issues with variance estimation