Search

Mud-rush mechanisms during ore extraction have not been fully studied. In this study, a new experimental setup was created to analyse mud-rush events under controlled conditions. A block caving drawbell was scaled and filled with wet granular material to be extracted. The material drawn was then classified based on its consistency index. The results showed that the yield stress and the material consistency are good predictors of mud events in the experimental results. Finally, mud-rush events occurred mainly when material consistency was classified as plastic, soft, or fluid – with soft and fluid being the most significant. [ABSTRACT FROM AUTHOR]

Pathogens can be collected from air and detected in samples by many methods. However, merely detecting pathogens does not answer whether they can spread disease. To fully assess health risks from exposure to airborne pathogens, the infectivity of those agents must be assessed. Air samplers which operate by growing particles through water vapor condensation and subsequently collecting them into a liquid medium have proven effective at conserving the viability of microorganisms. We present a study that assessed performance improvement of one such sampler, BioSpot-GEM™, gained by augmenting it with an upstream virtual impactor (VI) designed to concentrate particles in aerosols. We demonstrate that such an integrated unit improved the collection of live Escherichia coli by a median Concentration Factor (CF) of 1.59 and increased the recovery of viable human coronavirus OC43 (HCoV OC43) by a median CF of 12.7 as compared to the sampler without the VI. Our results also show that OC43 can be concentrated in this way without significant loss of infectivity. We further present that the small BioSpot-GEM™ bioaerosol sampler can collect live E. coli at an efficiency comparable to the larger BioSpot-VIVAS™ bioaerosol sampler. Our analyses show potential benefits toward improving the collection of viable pathogens from the air using a more portable water-based condensation air sampler while also highlighting challenges associated with using a VI with concentrated bioaerosols. This work can aid further investigation of VI usage to improve the collection of pathogens from air, ultimately to better characterize health risks associated with airborne pathogen exposures. Copyright © 2024 American Association for Aerosol Research [ABSTRACT FROM AUTHOR]

This study investigated the socioeconomic factors that predispose cocoa farmers to farm operation injuries, their choice of treatment and compliance with recommended safety standards. It used the multi-stage sampling technique to collect data from 400 cocoa farmers. Descriptive statistics, the ordered logistic and the multinomial logistic regression model were the method of analysis. The study found that injuries occur at all stages of farm operations, and sex, age, education level, alternative livelihood, household size, and farm size are associated with increased risk of injury. The majority of cocoa farmers prefer self-medication, with this practice being more common among young, less-educated male farmers with more farming experience and large farm sizes. It was found that compliance with recommended safety standards was influenced by sex, age, marital status, education level, farming experience, access to credit, and membership of a cooperative association. There is a need to raise awareness and provide education to cocoa farmers about the consequences of using herbal remedies and self-medication, and to emphasize the importance of seeking professional medical assistance. The study fills the literature gap by highlighting the socioeconomic factors that predispose farmers to injuries, the factors behind their choice of treatment methods and compliance with safety standards. [ABSTRACT FROM AUTHOR]

Exposure to genotoxic agents is associated with the development of cancer and related diseases. For this reason, assessing the genotoxicity of chemical compounds is necessary. In this line, information about the genotoxic effect of glufosinate-ammonium (GLA) has been reported only for the technical grade. However, humans are frequently exposed to commercial formulations of pesticides. Commercial formulations are characterized by using inner agents that increase toxicity compared to pesticides in technical grade. This study aimed to determine the cytotoxic and genotoxic effects of GLA on HepG2 cells. MTT and comet assays were performed to evaluate cell viability and DNA damage, respectively. HepG2 cells were exposed for 24 h to different concentrations of GLA (at 0.01 µg/mL; 0.04 µg/mL; 0.1 µg/mL; 0.24 µg/mL; 0.52 µg/mL; 1.25 µg/mL; 2.62 µg/mL and 13.12 µg/mL) in commercial- (Finale Ultra®) or technical-grade (GLAT). The results indicated that only Finale Ultra® induced a reduction in cell viability at 13.12 µg/mL. Furthermore, exposure to Finale Ultra® or GLAT was associated with increased DNA damage at concentrations from 0.52–13.12- µg/mL. This study shows the genotoxic effect of GLA on HepG2 cells. [ABSTRACT FROM AUTHOR]

Feminine trans individuals (i.e., individuals who were assigned male at birth but who have a feminine gender presentation and identity) are present in many cultures. In some cultures, these individuals identify as (trans) women. Many of these individuals undergo medical treatments to feminize their bodies (e.g., breast augmentation), but most do not undergo vaginoplasties and therefore have penises. In many non-Western cultures, feminine trans individuals identify as a non-binary gender (i.e., neither man, nor woman). Many of these individuals do not surgically augment their bodies. Across cultures, some men express sexual interest in feminine trans individuals. Are manifestations of sexual interest in feminine trans individuals consistent across Western and non-Western cultural settings? Our review suggests that, across cultures, most of these men are also sexually attracted to cisgender individuals. Many are sexually attracted to cisgender women or to cisgender members of both sexes. A small subset is sexually attracted to cisgender men. Men who are sexually interested in feminine trans individuals commonly report being primarily insertive during anal sex. Additionally, they tend to report that their sexual interest in these individuals is motivated by attraction to femininity or to the combination female- and male-typical characteristics. [ABSTRACT FROM AUTHOR]

This study aimed to identify Top, Bottom, and Versatile sexual role identities and anal sex behavior profiles using latent class analysis in a sample of 942 sexual minority men living in Bogotá. A Versatile-insertive and receptive class (52.2%) was the most prevalent of the four resulting classes, whereas the least common was a class (1.7%) that did not use labels and had a low probability of anal sex. We examined whether identity and relational factors (i.e., sexual orientation, LGBT collective identity, and partner type) were associated with profiles. Gay identity was associated with versatile and receptive classes and bisexual identity was associated with insertive and versatile classes. LGBT collective identity was associated with the class characterized by Bottom identity and receptive positioning. Partner type was not associated with class membership, but versatile behaviors were more common among encounters with a main partner. Models using data at different timescales offered consistent patterns of behavior between the last encounter and the past three months, though the versatile class in the three-month model split into two classes based on frequency of versatile positioning. Findings highlight the relationship between sexual identity and positioning and can inform interventions for sexual health education and identity development. [ABSTRACT FROM AUTHOR]

Background: Worldwide, Trans women from Latin America experience some of the highest rates of violence, which has led many to emigrate. There is limited research exploring the experiences of Trans migrants, and most LGBTQI2S + migrant research focuses on immigrant gay men. This study uses the frameworks of Intersectionality and the Social Determinants of Health (SDoH) to examine the impact of migration on the health and wellbeing of Latin American Trans women living in Toronto, Canada. Methodology: This qualitative arts-based study included nine participants and used hand mapping, a sociodemographic questionnaire, and focus groups to generate data. Data analysis encompassed inductive and deductive approaches and rigor was maintained through reflexivity and several verification strategies. Results: While migration was used as a safety strategy, participants' multiple identities as immigrants, Trans women, and Latinas, produced compounded experiences of oppression post-migration. Facing transphobia and xenophobia simultaneously, participants were forced to navigate precarious housing and employment, minimal social capital, and low social position. This limited their ability to exercise power and ultimately caused poor health and wellbeing post-migration; however, participants used sophisticated strategies to resist asymmetrical power relations, actively searching for safety and community participation, and caring for themselves and each other. Conclusion: The participants fought for inclusion across borders of economic exclusion and gender identity, borders of power and social position, as well as geopolitical borders. Their intersectional experiences across these "borders" should be understood in the context of migration without liberation, consumption without income, compounding oppressions, as well as positive intersectionality. While the women's resistance and strength are positive by-products of fighting oppression, they cannot be the solution. Access to health and wellbeing should not be a privilege for some; it must be a right for all. [ABSTRACT FROM AUTHOR]

Through qualitative data collected with women affected by drug use and drug-related violence in Bogotá, this article explores the convergence of harm reduction rationales and violence prevention programming in the urban margins to advocate for women's health empowerment and health rights as victims of intergenerational trauma and violence. We propose a methodological shift of public health praxis from street-based outreach models to intimate spaces of intervention for health outcomes embodiment1 as we continue to develop our community health model to work with marginalised communities in the urban global South. Through this work committed to social justice in marginalised urban communities, we seek to support women's health needs through harm reduction in historically marginalised communities in urban settings. Our results expose how multi-level gender-based violence affects women's health in their living spaces in the urban margins. Drawing from women's voices and narratives of urban violence, we call for a feminist alternative to traditionally masculinist and public-space oriented harm reduction practice for health empowerment in the urban margins. [ABSTRACT FROM AUTHOR]

Animal mortality due to collisions with vehicles in roads are a major threat to biodiversity; however, there is still much to learn about this problem in the tropical Andes hot spot. We describe general patterns of bird mortality associated with the presence of a road that bisects Cajas National Park (CNP), in the southern high Andes of Ecuador. We use a published study of the abundance of species in the study area, and explored if there were particular ecological traits that predisposed species to collisions with vehicles. Roadkill data were gathered by collecting carcasses on 15 km of a main road that crosses páramo grasslands. Overall we found carcasses of 23 species. Bird mortality rate was four individuals per km per year. We found an association between roadkills and the abundance of species in areas close to the road. Moreover, forest species were less likely to be road-killed than species with other habitat preferences. Our results can be used to ameliorate roadkills in CNP and to raise concern on the direct effects of roads in the páramo of the Tropical Andes. [ABSTRACT FROM AUTHOR]

Capsule: A ten-year study of the causes of mortality in birds brought to a wildlife rehabilitation centre in Portugal, reveals that most deaths were due to trauma. Aims: This study aims to identify the main causes of morbidity and mortality in wild birds admitted to a wildlife rehabilitation centre in Northern Portugal, from 2008 to 2017. Methods: A total of 6058 records of admittance and necropsy were examined. Results: In the 24 orders present in the study, the most commonly reported were the Charadriiformes (34.1%) and Passeriformes (28.7%). The majority were adult individuals (80%) and most admissions were in the summer (43.1%). The main causes of admission were birds being injured (57%) and orphaned (18.3%). Trauma was also the most important cause of death (57%), followed by predation (1.6%) and collision with buildings (1.6%). The non-traumatic causes of death (2606, 43%) were mainly of unknown origin (22.2%) and infectious diseases (10%). Conclusion: The data analysed in our study allowed us to conclude that the main causes of morbidity and mortality of the birds admitted was due to trauma. This kind of study can provide useful information on population and ecosystem health to inform conservation practices. [ABSTRACT FROM AUTHOR]

Dynamic simulation approach can be used for understanding the nonlinear behavior in mineral processing circuits. In this study, the dynamic simulation was carried out for the thickener of the Tabas coal-washing plant at different conditions and the effect of discharge rate variations on the solid volume fraction of the thickener under flow and mudline height was investigated. It was observed that for the conditions that the solid volume fraction of the thickener underflow is higher and the midline height is lower, the time to reach the steady state condition is higher. It was also observed that the maximum solid volume fraction of the thickener underflow decreases and the mudline height increases with pH reduction. Also, the maximum solid volume fraction of the thickener underflow decreases and the mudline height increases with particle size reduction at certain pH and flocculant dosage values. [ABSTRACT FROM PUBLISHER]

This article examined structural, social, and personal characteristics that shape the processes of gender affirmation and body modification among transgender persons (assigned male at birth) in Bogotá, Colombia. Qualitative data from life-history interviews (N = 14) and a focus group (N = 11) explored research questions concerning the ways in which the internal psychological and external contextual processes influence individuals' decisions and behaviors concerning hormonal treatment, injections, or surgery. Research questions concerning practices and consequences of treatment performed without medical supervision were addressed through qualitative data and quantitative data from 58 transgender participants. Findings indicated variation in ways participants conceptualized gender (e.g., binary or fluid), but an increased feminine presentation was a strong personal desire expressed by many and often encouraged by romantic partners and transgender friends. Transgender individuals within participants' social networks were frequently instrumental not only in providing information about hormones and contouring injections but also in carrying out procedures—sometimes with negative consequences. Body modification procedures occurred primarily outside the health care system, due to limited access to or awareness of medical care, societal stigma, social norms within the transgender community, and personal decision-making. Public health approaches to protect the health of transgender persons undergoing body modification were suggested. [ABSTRACT FROM AUTHOR]

Robert Triffin became famous with his trenchant analyses of the vulnerabilities of the Bretton Woods system. These are still at the centre of many discussions today. This article argues that there is a remarkable continuity in Triffin's work. From his earliest writings, Triffin developed a vision that the international adjustment process was not functioning according to the classical mechanisms. This view was based on thorough empirical analyses of the Belgian economy during the Great Depression and shaped by a business cycle perspective with an emphasis on the disequilibria and the transition period. His doctoral dissertation on imperfect competition theory and his Latin American experience further reinforced this basic view. [ABSTRACT FROM AUTHOR]

Recent advances in the crystallography of bacteriorhodopsin, the light-driven proton pump, have yielded structural models for all intermediates of the photochemical cycle. For seven of the species, X-ray diffraction data were collected from trapped photostationary states in crystals, and for the two remaining ones the structures of selected mutants are available. The changes of the retinal chromophore, protein and bound water describe, at an atomic level, how accommodation of the twisted photoisomerized retinal to its binding site causes de-protonation of the retinal Schiff base and initiates cascades of gradual conformational rearrangements of the protein. One cascade propagates in the extracellular direction and results in proton release, and the other in the cytoplasmic direction and results in side-chain and main-chain rearrangements, formation of a chain of hydrogen-bonded water, and proton uptake from the bulk. Such local-global conformational coupling, with gradual spreading of a local perturbation over the rest of the protein, might be the uniting principle of transporters and receptors. [ABSTRACT FROM AUTHOR]