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Keywords = salicylic hydroxamic acid

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22 pages, 5284 KB  
Article
Germination of Pisum sativum L. Seeds Is Associated with the Alternative Respiratory Pathway
by Lénia Rodrigues, Amaia Nogales, João Nunes, Leonardo Rodrigues, Lee D. Hansen and Hélia Cardoso
Biology 2023, 12(10), 1318; https://doi.org/10.3390/biology12101318 - 9 Oct 2023
Cited by 6 | Viewed by 5062
Abstract
The alternative oxidase (AOX) is a ubiquinol oxidase with a crucial role in the mitochondrial alternative respiratory pathway, which is associated with various processes in plants. In this study, the activity of AOX in pea seed germination was determined in two pea cultivars, [...] Read more.
The alternative oxidase (AOX) is a ubiquinol oxidase with a crucial role in the mitochondrial alternative respiratory pathway, which is associated with various processes in plants. In this study, the activity of AOX in pea seed germination was determined in two pea cultivars, ‘Maravilha d’América’ (MA) and ‘Torta de Quebrar’ (TQ), during a germination trial using cytochrome oxidase (COX) and AOX inhibitors [rotenone (RT) and salicylic hydroxamic acid (SHAM), respectively]. Calorespirometry was used to assess respiratory changes during germination. In both cultivars, SHAM had a greater inhibitory effect on germination than RT, demonstrating the involvement of AOX in germination. Although calorespirometry did not provide direct information on the involvement of the alternative pathway in seed germination, this methodology was valuable for distinguishing cultivars. To gain deeper insights into the role of AOX in seed germination, the AOX gene family was characterized, and the gene expression pattern was evaluated. Three PsAOX members were identified—PsAOX1, PsAOX2a and PsAOX2b—and their expression revealed a marked genotype effect. This study emphasizes the importance of AOX in seed germination, contributing to the understanding of the role of the alternative respiratory pathway in plants. Full article
(This article belongs to the Section Biochemistry and Molecular Biology)
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12 pages, 3072 KB  
Communication
Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite
by Xiang Yao, Xinyang Yu, Yuhui Zeng, Linghan Mao, Honghui Xie, Shanming Liu, Guichun He, Zhiqiang Huang, Haolin Wang and Zhilin Liu
Minerals 2022, 12(7), 817; https://doi.org/10.3390/min12070817 - 26 Jun 2022
Cited by 7 | Viewed by 2842
Abstract
In order to improve the recovery of rare earth elements, finding a collector with a strong selectivity ability had become the focus of research. In this paper, phenylpropyl hydroxamic acid (PHA) was used as a new hydrophobic surfactant collector for the separation of [...] Read more.
In order to improve the recovery of rare earth elements, finding a collector with a strong selectivity ability had become the focus of research. In this paper, phenylpropyl hydroxamic acid (PHA) was used as a new hydrophobic surfactant collector for the separation of bastnaesite from calcite, and salicylic hydroxamic acid (SHA) was used as a reference collector. The results of a single mineral flotation test with SHA show that the reagent has good collection performance and selectivity. In addition, Zeta potential measurements and FTIR analysis show that PHA is adsorbed on the surface of bastnaesite by chemical adsorption, and the surface state of bastnaesite changes after PHA treatment. By XPS analysis, PHA interacts with Ce, and forms a Ce–O bond with Ce. It is speculated that the hydroxamic acid forms a five-element-chelated hydroxamic group with Ce on bastnaesite surface, so as to improve the hydrophobicity of bastnaesite, and make bastnaesite float more easily out of the pulp. According to DFT calculation, PHA has better adsorption capacity and stronger hydrophobicity than SHA, and shows superior electronic group capacity and chemical reactions that promote its flotation performance. Full article
(This article belongs to the Special Issue Reagents and Surface Interaction Mechanisms in Mineral Flotation)
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16 pages, 3633 KB  
Article
Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation
by Liping Zhang, Shengnian Wu, Nan Zhang, Ruihan Yao and Eryong Wu
Minerals 2021, 11(4), 359; https://doi.org/10.3390/min11040359 - 30 Mar 2021
Cited by 7 | Viewed by 3302
Abstract
Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) [...] Read more.
Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC). Full article
(This article belongs to the Section Mineral Processing and Extractive Metallurgy)
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