ORCID Profile
0000-0002-2647-5747
Current Organisations
Instituto de Investigaciones sobre la Universidad y la Educacion
,
Secretaría de Educación de Jalisco
,
Sistema Nacional de Investigadores
,
Murdoch University
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Publications
Ozone Efficiency on Two Coleopteran Insect Pests and Its Effect on Quality and Germination of Barley
Publisher: MDPI AG
Date: 24-03-2022
Abstract: Ozone (O3) is a potential fumigant to control pests in stored grain since it can safely and rapidly auto-decompose without leaving residues. In this study, the efficacy of O3 on all life stages of Rhyzopertha dominica (Fabricius) and Tribolium castaneum (Herbst) in barley and the physiological effects on barley and its quality were investigated. Complete control of all life stages of pests was obtained at 700 ppm for 1440 min of ozone exposure without negatively impacting the contents of soluble protein, moisture content, seed colour, hardness, and the weight of thousand barley seeds. The eggs and pupae of these two insects were the more tolerant stages than their larvae and adults. Prolonged exposure times (40 to 1440 min) and mortality assessment intervals (1, 2, and 7 days) increased O3 efficacy due to the reaction characteristics and delayed toxicity. Aging barley seeds appeared to be more sensitive to prolonged ozone duration than new seeds. A total of 20 and 40 min could promote germination rate, and longer O3 exposure (1440 min) was unfavourable for germination and seedling growth. Thus, it is imperative to select an optimal O3 exposure time to transfer ozone into quality contributors of final products and achieve the desired functional outcomes.
The Effect of Ozone Treatment on Metabolite Profile of Germinating Barley
Publisher: MDPI AG
Date: 21-04-2022
Abstract: Ozone is widely used to control pests in grain and impacts seed germination, a crucial stage in crop establishment which involves metabolic alterations. In this study, dormancy was overcome through after-ripening (AR) in dry barley seed storage of more than 4 weeks alternatively, a 15-min ozone treatment could break the dormancy of barley immediately after harvest, with accelerated germination efficiency remaining around 96% until 4 weeks. Headspace solid-phase microextraction (HS-SPME) and liquid absorption coupled with gas chromatography mass spectrometry (GC-MS) were utilized for metabolite profiling of 2-, 4- and 7-day germinating seeds. Metabolic changes during barley germination are reflected by time-dependent characteristics. Alcohols, fatty acids, and ketones were major contributors to time-driven changes during germination. In addition, greater fatty acids were released at the early germination stage when subjected to ozone treatment.
Profiling Real-Time Aroma from Green Tea Infusion during Brewing
Publisher: MDPI AG
Date: 25-02-2022
Abstract: Aroma substances are the most crucial criteria for the sensory evaluation of tea quality, and also key attractors influencing consumers to make the decision for purchasing tea. Understanding the aromatic properties of tea infusion during different brewing time is crucial to control the tea aromatic quality. Here, headspace and direct immersion solid-phase microextraction (HS-SPME and DI-SPME), coupled with GC-MS, were employed to investigate the impact of brewing time on the changes of the volatile features of green tea infusion. Esters, aldehydes, alcohols, fatty acids, and alkaloids were the predominant volatile groups from tea infusions. Two to three minutes was identified as the best duration for the tea brewing that can maximize the abundance of aromatic chemicals in the headspace emitted from the tea infusions. The variation of the key aromatic contributors between the tea infusion and the headspace over the infusion tended to equilibrate during the tea brewing process. This study provides a theory-based reference method by analyzing the real-time aromatic characteristics in green tea. The optimal time was determined for aromatic quality control, and the complementary relationship between the volatiles in the headspace and its counterpart, tea infusion, was primarily elucidated.
Reframing the policy discourse: A comparative analysis of teacher preparation for rural and remote education in Australia, South Africa and Mexico
Publisher: Mary Lou Fulton Teacher College
Date: 14-06-2021
Abstract: The Organisation for Economic Cooperation and Development (OECD) has highlighted a ‘vicious cycle of decline’ in rural, regional and remote (RRR) regions, with significant inequalities in educational outcomes between rural and urban areas. However, interventions have not resulted in transformative or lasting improvements to education in rural contexts. This paper presents a cross-comparative country analysis of current global policy on RRR education. We used a policy analysis framework to interrogate national policy texts concerning teacher education for RRR contexts in three countries - Australia, South Africa and Mexico. A rigorous selection process of the literature yielded 17 key policy texts, which were examined for the influences, practices, language and outcomes relating to teacher education preparation for RRR locales. Findings highlighted a legacy of historical influences and a metrocentric bias in policy texts, with limited ex les of assets-based education. We argue that these factors may be perpetuating the significant and persistent disadvantage in RRR education. We recommend an alternative policy discourse that recognises the productivities and potentialities of an assets-based approach within the local context, where school leaders and teachers are positioned as central change agents in RRR education.
Related Organisations
Instituto De Investigaciones Sobre La Universidad Y La Educacion
Location: Mexico
Instituto Superior De Investigación Y Docencia Para El Magisterio
Location: Mexico
Related Funding Activities
No related grants have been discovered for Xue Dong.