Abstract:Assisted reproductive technologies and in vitro embryo culture can expose embryos to stressors that increase the risk of chromosomal abnormalities. Mesenchymal stem cells (MSCs) are known to secrete bioactive factors with potential protective effects against cellular stress and DNA damage. This study aims to investigate the effect of rat bone marrow-derived MSC-conditioned medium (BM-MSCCM) on the developmental potential and chromosomal stability of rat embryos. BMMSCs were isolated from adult Wistar rats and expanded to passages 3–4 to collect BM-MSC-CM. Rat oocytes and sperm were subjected to intracytoplasmic sperm injection (ICSI), and embryos were cultured in medium supplemented with 0%, 2%, 5%, and 10% BM-MSC-CM until day 4. Fertilization, cleavage, and blastocyst formation rates were recorded, and chromosomal integrity was assessed by karyotyping. Results show that developmental outcomes did not differ significantly among groups. The 10% CM group exhibited the highest blastocyst formation rate, though differences were not statistically significant. Chromosomal abnormalities, including aneuploidy, structural aberrations, and polyploidy, were observed at comparable frequencies across all groups. In summary, supplementation with BMMSCCM did not significantly improve embryo development or reduce chromosomal abnormalities in rat embryos. These findings suggest that the concentration of beneficial factors may have been insufficient or counteracted by metabolic byproducts, warranting further optimization.
Abstract:Papua New Guinea is home to over 840 living languages, making it the most linguistically diverse nation on Earth and presenting unique challenges for educational policy. This multilevel analysis examines the relationship between classroom linguistic heterogeneity and student achievement in mathematics and literacy across 92 primary schools in five provinces. Using hierarchical linear modeling with data from standardized assessments of 4,830 students in grades three through six, we find that moderate linguistic diversity within classrooms correlates with enhanced metalinguistic awareness and problem-solving skills, while extreme fragmentation is associated with reduced literacy outcomes when instruction is delivered exclusively in English. Schools implementing structured bridging programs between tok pisin and English show significantly improved results, supporting the case for flexible multilingual education policies tailored to local linguistic ecologies.
Abstract:Access to fresh water remains a critical challenge for coastal settlements along the Skeleton Coast of Namibia, where conventional desalination infrastructure is economically unfeasible. This study presents the design, deployment, and performance evaluation of three modular solar-powered reverse osmosis units installed in communities between Henties Bay and Terrace Bay during 2024 and 2025. System configurations incorporating photovoltaic-thermal hybrid panels and energy recovery devices achieve specific energy consumption of 2.8 kilowatt-hours per cubic meter, representing a 35 percent improvement over baseline solar reverse osmosis designs. Seasonal performance analysis across 14 months demonstrates reliable year-round operation with output ranging from 1.2 to 3.4 cubic meters per day. Cost-benefit projections indicate economic viability within four years under current subsidy frameworks available in Namibia.
Abstract:Microfinance has been widely promoted as a vehicle for economic empowerment in sub-Saharan Africa, but evidence of its effectiveness for women entrepreneurs in savanna regions remains sparse. This longitudinal study tracks 340 women micro-entrepreneurs across six districts in Northern Ghana over a three-year period from 2023 to 2025, comparing participants in group lending programs with a matched control group. Using difference-in-differences estimation and qualitative life history narratives, we find that microfinance access leads to a 32 percent increase in monthly business revenue and significant improvements in household food security indicators. However, benefits are concentrated among women with prior market experience, while the most marginalized participants show minimal gains without complementary skills training and mentorship support.
Abstract:Indigenous knowledge systems offer valuable perspectives for biodiversity conservation, yet their integration into formal environmental management remains limited in Central America. This ethnobotanical study documents traditional ecological knowledge held by Qeqchi and Mopan Maya communities across three protected areas in southern Belize. Through participant observation, structured plant walks, and 156 semi-structured interviews conducted over two years, we identified 287 plant species actively managed through traditional practices, including 34 species not previously recorded in regional conservation databases. Comparative analysis reveals that community-managed forest patches exhibit 23 percent higher species richness than adjacent government-protected zones. The findings advocate for co-management frameworks that formally incorporate indigenous stewardship practices into national protected area governance structures.
Abstract:Small Island Developing States face disproportionate risks from coastal erosion exacerbated by rising sea levels and intensifying storm events. This research develops and validates ensemble machine learning models for predicting shoreline retreat across 23 coastal segments in Viti Levu, Fiji, integrating satellite imagery, tidal gauge records, bathymetric surveys, and socioeconomic exposure data spanning 2005 to 2025. Random forest and gradient boosting classifiers achieve prediction accuracies of 89 and 91 percent respectively for five-year erosion trajectories, outperforming traditional empirical models by substantial margins. Wave energy flux and sediment budget parameters emerge as dominant predictive features. The resulting vulnerability maps provide actionable guidance for coastal zone management authorities prioritizing infrastructure relocation and nature-based defense investments.
Abstract:The transformation of abandoned mining sites into culturally and economically productive spaces represents a growing priority in Central European heritage policy. This comparative study examines eight post-mining sites across the Upper Nitra region of Slovakia and the Ostrava-Karvina district of Czechia, analyzing adaptive reuse strategies implemented between 2010 and 2025. Through archival research, stakeholder interviews, and spatial analysis, we assess how local governance structures, funding mechanisms, and community engagement practices shape rehabilitation outcomes. Findings reveal that participatory planning approaches yield higher community satisfaction and visitor engagement, while top-down redevelopment models achieve faster physical transformation but lower social integration. The study proposes a hybrid framework balancing institutional efficiency with grassroots involvement for sustainable heritage regeneration.
Abstract:Vaccine hesitancy poses a persistent challenge to public health campaigns in low-income rural communities across South Asia. This cross-sectional study investigates psychosocial determinants of immunization reluctance among 1,420 adults in four subdistricts of Noakhali Division, Bangladesh. A validated survey instrument measuring perceived risk, trust in healthcare institutions, social influence, and information source credibility was administered between March and September 2025. Multivariate logistic regression reveals that misinformation exposure through informal social networks is the strongest predictor of hesitancy, followed by low institutional trust and prior negative healthcare encounters. Community health worker engagement significantly moderates these effects, suggesting targeted interpersonal communication strategies as the most effective intervention pathway for improving vaccine uptake in similar contexts.
Abstract:Supply chain transparency has emerged as a critical factor in ensuring equitable market access for smallholder farmers in sub-Saharan Africa. This study evaluates the feasibility and impact of blockchain-based traceability systems deployed across 14 coffee cooperatives in the Northern Province of Rwanda. Using a mixed-methods approach combining transaction log analysis with semi-structured interviews of 238 cooperative members, we examine adoption patterns, operational costs, and perceived benefits over an 18-month implementation period. Results indicate a 27 percent increase in buyer trust metrics and a 15 percent premium on traced lots, though infrastructure limitations and digital literacy gaps remain significant barriers. The findings contribute to ongoing debates about technology-driven agricultural development in resource-constrained settings.
Abstract:Corruption, fraud, and maladministration within South African universities have increasingly attracted public attention, with allegations frequently reported across national and local media platforms. Despite the prominence of these concerns, systematic empirical research examining whistleblowing and its institutional governance within the higher education sector remains limited. This study seeks to address this gap by analysing the policy frameworks, institutional practices, and experiences surrounding whistleblowing in South African universities. The study first situates whistleblowing within the broader international anti-corruption discourse by examining definitions and conceptual frameworks advanced by leading global anti-corruption organisations and scholarly literature. This review highlights key similarities and contextual variations in the regulation and protection of whistleblowers across jurisdictions. The analysis then turns to the South African context, examining the legislative and policy architecture governing whistleblowing within the public sector and higher education institutions. Empirically, the research investigates whistleblowing policies and practices at three South African universities. A qualitative research design grounded in grounded theory was employed. Data were collected through the analysis of relevant legislation, institutional policy documents, and semi-structured interviews with eight academics and university administrators selected through stratified sampling. The findings reveal a strong consensus among participants regarding the critical role of whistleblowing in addressing corruption and promoting institutional accountability. However, the study also identifies significant challenges, including limited institutional support, perceived organisational resistance, and insufficient protection for whistleblowers. The article argues that while South Africa has developed an extensive regulatory framework governing whistleblowing, the effectiveness of these mechanisms ultimately depends on the extent to which institutions actively protect, support, and legitimise whistleblowers as key actors in promoting ethical governance within universities.