Research Articles

This communication examines the revitalization of the pratuokng, a traditional Bidayuh bamboo tube zither from Annah Rais, Sarawak, through a qualitative ethnographic case study. A pratuokng is an idiochord tube zither, a musical instrument consisting of one drum and seven strings. Data were collected through interviews with cultural practitioner Arthur Borman, observation of teaching and performance contexts, and review of relevant ethnomusicological literature. The study analyzes how instrument knowledge, tuning practices, and performance techniques are transmitted and adapted in response to contemporary social change and strategies used in encouraging younger generations to performed with pratuokng. Particular attention is given to Borman’s innovations in instrument configuration and musical range, and to how these developments generate debate regarding authenticity, legitimacy, and cultural authority. Previously published acoustic data are referenced to contextualize sound behavior; however, the analytic focus of this paper remains interpretive rather than experimental. Theoretically, the study contributes to discussions on cultural sustainability by framing tradition as a negotiated, evolving process rather than a fixed object. Findings indicate that context-sensitive innovation, community-based pedagogy, and selective global exposure can support continuity of endangered musical heritage while maintaining cultural integrity.

This study investigated the influence of nanosilica on the vibro-acoustic behavior, microstructure, and structural characteristics of composites based on poplar wood flour and recycled polystyrene. Composites containing 50 wt% wood flour and 0, 2, 4, and 6 phc nanosilica were prepared using twin-screw extrusion. Vibro-acoustic properties were evaluated using a non-destructive flexural vibration method, while the fractured-surface morphology and diffraction characteristics were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Nanosilica caused only minor changes in sound velocity, loss tangent, acoustic coefficient, acoustic conversion efficiency, and dynamic modulus of elasticity, with no statistically significant differences among the formulations (p > 0.05). SEM images showed apparent reductions in interfacial voids and improved contact between the wood flour and polymer matrix with nanosilica incorporation. XRD patterns indicated that the composites retained a predominantly amorphous character, while the changes in diffraction intensity suggested differences in X-ray scattering following nanosilica incorporation. Overall, nanosilica altered the apparent microstructural characteristics of the composites without significantly affecting their vibro-acoustic performance. The combination of stable vibro-acoustic properties and the use of recycled polystyrene suggests potential for these composites in lightweight panel and interior applications where stable acoustic behavior is desirable.

Southern Blue Gum (SBG) essential oil was chemically characterized and evaluated for selected biological activities using integrated in vitro assays supported by exploratory in silico analysis. GC–MS profiling identified nine constituents, with 1,8-cineole (eucalyptol) representing 90.51% of the total composition, indicating a cineole-dominant chemical profile. Antibacterial screening against representative Gram-positive and Gram-negative bacteria showed pronounced inhibitory effects, with inhibition zones ranging from 24.3 to 38.8 mm and minimum inhibitory concentrations of 62.5–125 µg/mL depending on the strain. Anti-biofilm testing demonstrated concentration-dependent inhibition, with the strongest reduction observed for Pseudomonas aeruginosa (61.35% at 0.5 MIC). Antioxidant evaluation using DPPH and ABTS assays revealed dose-dependent radical scavenging activity. Cytotoxicity screening in Caco-2 and HepG2 cell lines showed concentration-dependent responses with IC₅₀ values of 24.4 ± 0.15 and 59.52 ± 0.35 µg/mL, respectively. Molecular docking suggested moderate interaction of eucalyptol with bacterial DNA gyrase through hydrophobic contacts and hydrogen bonding. This study provides integrated chemical and functional characterization of cineole-rich Southern Blue Gum oil and supports further investigation of eucalyptus-derived volatile compositions in antimicrobial and biofilm-control research, while indicating that additional pharmacological, selectivity, and in vivo studies are required before translational application.