The disregarded weight of the ancestors: Honouring the complexities and cultural subtleties of islandscape

Starting from a comparison between the Belep Islands (Kanaky New Caledonia) and O’ahu (Hawai’i), this paper aims to contribute to the debates about islands and the Anthropocene, highlighting the relevance of the social and ecological responsibilities deriving from genealogical connections to the islands: ‘the weight of the ancestors’. Considering the implications of these kinds of responsibilities can help to understand human and non-human relational entanglements better so as to value the agentive role of other-than-human perspectives

Il mondo sotto la superficie. L’ontologia liquida delle isole Belep (Kanaky Nuova Caledonia)

The recent literature on “marine sovereignty” encourages to consider the ways of management and governance of the Pacific Ocean from a new perspective, in order to face the ecological crisis and acknowledge the coexistence of different ontologies. In this paper I aim to convey the density and the poly-chrony that characterize the aquatic ontology of the Belema people, the inhabitants of the Belep Islands (Kanaky New Caledonia). For the Belema, the ocean is more than a surface to cross or the source of important economic resources. The ocean is a dense space: visible and invisible intertwine in its opaque depth; past and present, life and death mingle; human and non-human meet. The aquatic geography (a hydrography, punctuated by underwater villages and paths), the genealogies (in which the first ancestors are marine animals) and the continuities and correspondences between aquatic and terrestrial beings reveal the force of the ocean. It shapes the Belema society and contributes to making it a more-than-human society

A viral chitinase enhances oral activity of TMOF

In this study we investigate the combined effect on Heliothis virescens (Lepidoptera, Noctuidae) larvae of Aedes aegypti-Trypsin Modulating Oostatic Factor (. Aea-TMOF), a peptide that inhibits trypsin synthesis by the gut, impairing insect digestive function, and Autographa californica nucleopolyhedrovirus Chitinase A (AcMNPV ChiA), an enzyme that is able to alter the permeability of the peritrophic membrane (PM). Aea-TMOF and AcMNPV ChiA were provided to the larvae by administering transgenic tobacco plants, co-expressing both molecules. Experimental larvae feeding on these plants, compared to those alimented on plants expressing only one of the two molecules considered, showed significantly stronger negative effects on growth rate, developmental time and mortality. The impact of AcMNPV ChiA on the PM of H. virescens larvae, measured as increased permeability to molecules, was evident after five days of feeding on transgenic plants expressing ChiA. This result was confirmed by in vitro treatment of PM with recombinant ChiA, extracted from the transgenic plants used for the feeding experiments. Collectively, these data indicate the occurrence of a positive interaction between the two transgenes concurrently expressed in the same plant. The hydrolytic activity of ChiA on the PM of tobacco budworm larvae enhances the permeation of TMOF molecules to the ectoperitrophic space, and its subsequent absorption. The permeation through the paracellular route of Aea-TMOF resulted in a spotted accumulation on the basolateral domain of enterocytes, which suggests the occurrence of a receptor on the gut side facing the haemocoel. The binding of the peptide, permeating at increased rates due to the ChiA activity, is considered responsible for the enhanced insecticide activity of the transgenic plants expressing both molecules. These data corroborate the idea that ChiA can be effectively used as gut permeation enhancer in oral delivery strategies of bioinsecticides targeting haemocoelic receptors

Electrochemical treatment coupled with solar light-driven photocatalytic approach: A challenging process in cascade for hydrogen production and wastewater remediation

This study presents an innovative approach for simultaneous hydrogen production and wastewater remediation, integrating electrochemical treatment with solar light-driven photocatalysis. The research focuses on the use of a noble metal-free cathode, based on a electrodeposited composite of Co2P and elemental P, for efficient hydrogen generation from simulated wastewater through water splitting. This composite is characterized, in its optimized form, by an overpotential equal to 133.6 mV (at 10 mA cm-2) and by a Tafel slope of 60.5 mV dec-1. Challenges like the high potential required for the Oxygen Evolution Reaction (OER) and the use of expensive noble metals in electrodes are addressed by employing earth-abundant compounds for electrode fabrication. Additionally, the study explores the degradation of diclofenac (DCF) in wastewater, demonstrating that electrochemical treatment alone is insufficient for organic matter removal. Therefore, a coupled process involving a first electrochemical treatment step followed by a photocatalytic process using BiOCl is proposed. Thanks to the exposure of the (110) active face, BiOCl possesses excellent photocatalytic performances even under solar light irradiation. This hybrid approach not only enhances the efficiency of DCF degradation (about 90%) and reaches an organic matter removal of 59%, but it also improves hydrogen production, offering a sustainable solution for energy generation and water purification in the face of increasing global industrialization and water scarcity