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From shelf signalling to delisting: CSR commitment and consumer response to nationally sourced organic private-label products
No full textInternational audiencePurpose Amid growing consumer scepticism toward symbolic corporate social responsibility (CSR) initiatives, this study aims to investigate how the strength of retailers' CSR commitment – operationalised as either weak (reflected in the signalling of nationally sourced organic private-label products (PLPs) on shelves) or strong (reflected in the delisting of non-nationally sourced organic PLPs) – influences consumer perceptions and behaviours. Specifically, it examines how the level of CSR commitment moderates the relationship between consumer perceptions of retailers' CSR and their actual purchases of organic PLPs. Design/methodology/approach The research combines a qualitative exploratory study with a laboratory experiment involving 315 participants. The qualitative phase, drawing on 20 semi-structured interviews, examines how consumers perceive CSR actions as reflecting either weak or strong commitment. The experimental phase uses a between-subjects design to compare two conditions: shelf signage (weak commitment) and product delisting (strong commitment). Participants' perceptions of CSR, trust in organic private labels (PLs), behavioural intentions and actual purchases of organic PLPs are measured and analysed using partial least squares structural equation modelling and multigroup analysis. Findings Results show that strong CSR commitment – manifested through the voluntary delisting of non-nationally sourced organic PLPs – leads to higher perceived respect for consumers and suppliers, greater trust in the organic PL and increased purchases of organic PLPs. Trust and behavioural intentions fully mediate the relationship between perceived CSR and actual purchases. Originality/value This study conceptualises CSR as a continuum of commitment and demonstrates that the strength of CSR actions significantly shapes consumer responses. It contributes to CSR and retail literature by highlighting the importance of signal credibility and the strategic value of substantial CSR initiatives
Rebuilding Ukraine’s capacity for fundamental research in evolutionary biology
No full textInternational audienceOne of the most acute challenges now facing Ukrainian science is training and skills preservation for the next generation of scientists. As financial and human resources are diverted to the war effort, universities and research institutes can no longer reliably invest in long-term education, mentoring, and international experiences for students and early-career researchers. Although science is one of the foundations of economic development and a basis for applied research, fundamental research is highly vulnerable in times of instability. Owing to the war waged in Ukraine by the Russian Federation, many Ukrainian scientists have lost their research facilities and funding, and/or joined the military to defend the country. Some have lost their lives2. To counteract the negative effects of the war on the training of the next generation of scientists, we held the Ukrainian School in Evolutionary Biology (USEB) in January 2025
Self-protection and self-insurance in pest management: The role of risk preferences and beliefs
No full textNational audienceFarmers worldwide manage yield risk mostly by applying pesticides, with possible negative impacts on human health and the environment. To analyse these decisions, we set up a two-period model in which a farmer first decides whether to adopt preventive measures that lower the risk of pest infestation (self-protection), before deciding ex-post about pesticides application (self-insurance). These two decisions are found to be substitutes in most cases. Under some conditions, we show that more risk-averse farmers apply more pesticides (i.e., more self-insurance) and exert fewer preventive efforts (i.e., less self-protection). We illustrate these theoretical findings using simulations calibrated from real data on crop producers from France. Decisions seem primarily driven by the costs of prevention and pesticides and by farmers’ risk beliefs, while farmers’ risk aversion plays a relatively minor role
Decoding Tocopherol-Polyphenol interactions in oil-in-water emulsions through combined WIM-CAT and CV assays
No full textSource Agritrop Cirad (https://agritrop.cirad.fr/616786/) * Autres projets (id;sigle;titre): 101158035;PassIon;(EU) High Performance and Large-Scale Electrodes for Selective Ion Recovery//International audienceThe antioxidant interactions of α- and γ-tocopherol with curcumin and quercetin were assessed in an oil-in-water emulsion using the WIM-CAT assay, a method integrating Weibull interaction modeling with the conjugated autoxidizable triene technique. Synergistic effects were strongest for γ-tocopherol with curcumin and for α-tocopherol with quercetin, particularly at low tocopherol concentrations (0.2 μM in emulsion, 380 ppm in oil) and high molar ratios (3:1). Increasing tocopherol concentration to 0.6 μM in emulsion (1140 ppm in oil) reduced synergy, likely reflecting pro-oxidant activity. The presence of ferrous ions accelerated oxidation but did not influence synergistic interactions, while acidic conditions reduced tocopherol pro-oxidation and modified the effects of curcumin and quercetin. Weibull modeling revealed isoform-dependent differences during the propagation phase of oxidation. Cyclic voltammetry further suggested that the synergy of α-tocopherol may involve antioxidant regeneration mechanisms, whereas γ-tocopherol appears to act through alternative redox processes. Together, kinetic and electrochemical analyses provide complementary insights into the conditions governing antioxidant interactions
RGPD : Tous concernés...mais tous en conformité ?
No full textNational audienceDans un contexte de protection croissante des données à caractère personnel où tout l’enjeu est de garantir l’anonymat des enquêtés, la confidentialité et la sécurisation de leurs données,Cette présentation vise à sensibiliser les agents aux exigences du RGPD (Règlement Général sur la Protection des Données) et à en comprendre les enjeux en présentant le processus de mise en conformité, permettant de garantir que les données sont conformes avec ces exigences
How a periodic thermal environment can trigger robust coexistence
No full textThe Competitive Exclusion Principle is a cornerstone of ecology, predicting that n species cannot coexist on fewer than n limiting resources. While this principle is robustly validated in constant environments like the chemostat, it fails to account for the vast biodiversity observed in nature. In this study, we challenge this classical paradigm by investigating how periodic fluctuations in a thermal environment -rather than artificial variations in operating parameters -influence the outcome of single-resource competition. Combining mathematical analysis based on Floquet theory with numerical exploration, we demonstrate that periodic temperature variations can trigger robust, stable coexistence over a wide parameter space. We show that the domain of coexistence expands with increased nutrient enrichment (larger Sin) and slower environmental cycles. However, we also identify a critical trade-off: slower fluctuations induce high-amplitude population oscillations, which may increase the risk of extinction during periodic troughs. Our findings provide a biologically realistic mechanism for biodiversity and suggest that environmental periodicity is a fundamental driver of species coexistence in natural systems
Bridging gaps in agro-ecosystem integration: a multi-level modelling study in semi-arid Burkina Faso
No full textInternational audienceHighlights: • Agent-based model tracked nutrient and resource flows in mixed farming systems. • Sensitivity analysis found key biophysical (e.g. nitrogen uptake) and social drivers. • Model captured emergent, nonlinear effects across 700 farms in Burkina Faso. • Scenarios revealed trade-offs between yields, income equity, and sustainability. • Results inform tailored management strategies (subsidies, legumes) in agroecosystems.Abstract: Mixed crop–livestock systems are central to livelihoods in semi-arid West Africa, yet they face persistent challenges related to low input efficiency, nutrient depletion, and food insecurity. These systems are characterized by complex social and biophysical interactions that produce nonlinear outcomes, complicating sustainable management.To unravel this complexity, we developed TENGA—an agent-based model (ABM) simulating the dynamics of 700 heterogeneous farms in semi-arid Burkina Faso. The model captured spatial and temporal interactions among crop and livestock management, nutrient flows, and farmers’ interactions. A Morris sensitivity analysis was used to identify key parameters influencing system behavior, and scenario analysis explored interventions to improve crop-livestock integration including legume intensification (increasing the functional contribution of nitrogen-fixing legumes), fertilizer subsidies, and intensified direct exchange of manure and crop residues.Nitrogen uptake efficiency, livestock feed parameters, manure management, and social interactions emerged as critical drivers of system outcomes. Sensitivity analysis revealed nonlinear feedbacks, particularly in the propagation of farm-level effects (e.g. income) to village-level dynamics (e.g. equity). Antagonistic responses among farm types reduced overall system gains, highlighting the interconnectedness of component interactions. Scenario results showed that while nitrogen-fixing legumes improved yields and reduced nutrient mining, they also reduced herd size and increased transhumance pressure. Fertilizer subsidies favored wealthier farms but did not address food insecurity among subsistence households. Intensified residue–manure exchanges enhanced nutrient recycling but had minimal impact at system level.This study demonstrates the utility of ABMs for exploring the multi-dimensional and multi-level dynamics of mixed farming systems of semi-arid West Africa
One-step biphasic NADES extraction of phenolics and carotenoids from tomato peels with integrated life cycle assessment
No full textInternational audienceA biphasic NADES extraction system composed of choline chloride:urea (ChUr) and menthol:thymol (MenThy) was developed to enable the simultaneous extraction and separation of phenolic compounds and carotenoids from tomato peels. In sequential extractions, ChUr recovered 198 μg/gDW of phenolics, primarily 4-hydroxybenzoic acid and 4-hydroxybenzaldehyde, and MenThy enabled the extraction of 601 μg/gDW of carotenoids (lycopene and β-carotene), along with a part of flavonoids, namely quercetin (94 μg/gDW) and naringenin (50 μg/gDW). The design of a biphasic NADES system (1:1, v/v) resulted in a 40% increase in phenolic extraction, along with partial phase separation of the flavonoids: 26% of quercetin and 9% of naringenin remained in the MenThy phase. Increasing the ChUr volume to a 3:1 ratio improved partitioning, with 89% of phenolics recovered in the hydrophilic phase (ChUr). A simplified life cycle assessment (LCA) focusing on energy inputs revealed that the biphasic 1:1 system was 28% more energy efficient than the sequential extraction process, and exhibited lower CO₂-eq impacts. These findings highlight the potential of biphasic NADES systems for one-step, energy-efficient extraction and partitioning of bioactive compounds from agro-industrial residues. Further optimization of solvent polarity and composition could enhance the selectivity of this extraction process.</div