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- 저자 : João Valente (검색결과 2 건)
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João Valente,Rodrigo Almeida,Lammert Kooistra 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.2
Apples emit a volatile organic compounds during the ripening process named ethylene, which can be used to infer the optimalharvest time. Currently, the fruit ethylene emission is assessed in controlled facilities, thus laborious and expensive. Thisarticle pioneers the study of assessing ethylene emissions in uncontrolled environments. However, understanding how theethylene spatial temporal dynamics in an open fi eld, its still elusive. Therefore, this paper provides a model from an ( Malusdomestica Borkh) apple orchard for simulation and analysis of ethylene behaviour. We demonstrate that the model is able toexplain the ethylene emissions behaviour in an orchard fi eld when subject to diff erent wind speeds, directions and ripenessstages. Based on that we have investigated diff erent sampling schemes—regular and random—for capturing the variabilityof ethylene in an orchard using an electrochemical gas sensor. These results show that a random sampling scheme performs25% better than an equivalent regular-defi ned grid. Moreover, the measurements acquired locally in the rows tend to be 10%more reliable than in other locations from the orchard. Finally, the ethylene variability can be assessed with a confi dence of75% using 4 and 16 sampling points.
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Ana Beatriz Vilela Teixeira,Mariana Lima da Costa Valente,João Pedro Nunes Sessa,Bruna Gubitoso,Marco Antonio Schiavon,Andréa Cândido dos Reis 대한치과보철학회 2023 The Journal of Advanced Prosthodontics Vol.15 No.2
PURPOSE. This study incorporated the nanomaterial, nanostructured silver vanadate decorated with silver nanoparticles (AgVO3), into heat-cured resin (HT) at concentrations of 2.5%, 5%, and 10% and compared the adhesion of multispecies biofilms, surface characteristics, and mechanical properties with conventional heat-cured (HT 0%) and printed resins. MATERIALS AND METHODS. AgVO3 was incorporated in mass into HT powder. A denture base resin was used to obtain printed samples. Adhesion of a multispecies biofilm of Candida albicans, Candida glabrata, and Streptococcus mutans was evaluated by colony-forming units per milliliter (CFU/mL) and metabolic activity. Wettability, roughness, and scanning electron microscopy (SEM) were used to assess the physical characteristics of the surface. The mechanical properties of flexural strength and elastic modulus were tested. RESULTS. HT 10%-AgVO3 showed efficacy against S. mutans; however, it favored C. albicans CFU/mL (P < .05). The printed resin showed a higher metabolically active biofilm than HT 0% (P < .05). There was no difference in wettability or roughness between groups (P > .05). Irregularities on the printed resin surface and pores in HT 5%-AgVO3 were observed by SEM. HT 0% showed the highest flexural strength, and the resins incorporated with AgVO3 had the highest elastic modulus (P < .05). CONCLUSION. The incorporation of 10% AgVO3 into heat-cured resin provided antimicrobial activity against S. mutans in a multispecies biofilm did not affect the roughness or wettability but reduced flexural strength and increased elastic modulus. Printed resin showed higher irregularity, an active biofilm, and lower flexural strength and elastic modulus than heat-cured resin. [J Adv Prosthodont 2023;15:80-92]
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