Two new solanapyrone analogues, solanapyrones N and O (1 and 2, resp.), and three known compounds, solanapyrone C (3), nigrosporalactone (4), and phomalactone (5), were isolated from the fermentation culture of Nigrospora sp. YB-141, an endophytic fungus isolated from Azadirachta indica A. Juss. The structures of the new compounds were elucidated on the basis of spectroscopic analysis. The antifungal activities of 1-5 towards seven phytopathogenic fungi were tested. Most of the compounds exhibited no or only weak antifungal activities.

No abstract

No abstract

No abstract

Purpose The purpose of this paper is to improve our understanding of how firms can maintain longitudinal satisfaction. Previous research on longitudinal satisfaction demonstrates that the product attributes weight on satisfaction shifts over time. However, the existing literature lacks an understanding of the intervening mechanism. Inspired by the hedonic adaptation theory, this research first argues that the shift depends on the attribute’s variability. Then, it posits that hedonic adaptation might play a mediation role in connecting the attribute’s weight and longitudinal satisfaction. Finally, the research incorporates consumer intentional activities into the antecedents of longitudinal satisfaction. Design/methodology/approach The authors test a series of hypotheses across two studies. Using the Slope-shift Parameter Theory and Structural Equation Modeling, data collected from smartphone owners in four MBA classes (Study 1) and eight business venues in China (Study 2) are analyzed to confirm the research model. Findings The findings suggest that hedonic adaptation occurs during the ownership process. It is revealed that both the attribute’s variability and consumption behavior play important roles in sustaining long-term satisfaction, confirming the mediating effects of hedonic adaptation on the relationship above. Originality/value The hedonic adaptation theory is applied to study the mediating role of product attribute variability and consumption behavior in sustaining customer satisfaction over time. Three contributions are offered: First, hedonic adaptation occurs during the ownership process; second, the attribute’s variability and consumption behavior both play important roles in sustaining longitudinal satisfaction; third, the mediating effects of hedonic adaptation are confirmed for the relationship between attribute’s variability and sustaining satisfaction and consumption behavior and sustaining satisfaction.

No abstract

No abstract

Emissions of five volatile organic sulfur compounds (VOSCs), including methanethiol, carbonyl sulfide, dimethyl sulfide, carbon disulfide, and dimethyl disulfide, from a heavily polluted river, Shijing River in Guangzhou of South China, was studied. The results showed that the amounts of all VOSCs emitted from the river increased from downstream to upstream along the river with increasing magnitude of water pollution. The emission of carbonyl sulfide was the highest among the target analytes, ranging from 23.8 μg m −2 h −1 to 42.6 μg m −2 h −1 at the water surface of Shijin River. The concentration levels of VOSCs on the riverbank were lower than those at the water surface either in Shijing River or in Liuxi River. However, the contribution of dimethyl disulfide to the total VOSCs on the riverbank was higher than that at the water surface in most sampling sites, indicating that there might be a point source of dimethyl disulfide on the riverbank besides diffusion from water surface. The 24-h semi-continuous monitoring data revealed that the emissions of VOSCs at the water surface peaked at 9:00 and 21:00, which was consistent with the water quality variability in Shijin River caused by daily tidal variation.