The O₂‑Mediated Cross-Dehydrogenative Coupling: Rose Bengal-Catalyzed Direct Oxidative α‑Acyloxylation of Ketones

A general and facile approach for the direct oxidative α-acyloxylation of ketones using molecular oxygen as the oxidant is developed. This method avoids the use of excessive peroxides and expensive metal catalysts, affording a variety of α-acyloxylated ketones in satisfactory yields. Experimental studies indicate that the reaction proceeds via a radical pathway. Additionally, α-hydroxy ketones could be obtained by changing the solvent

Electrochemical Oxidative C–H Arylation of Quinoxalin(on)es with Arylhydrazine Hydrochlorides under Mild Conditions

A practical and scalable protocol for electrochemical arylation of quinoxalin­(on)­es with arylhydrazine hydrochlorides under mild conditions has been developed. This method exhibits high efficiency, easy scalability, and broad functional group tolerance. Various quinoxalin­(on)­es and arylhydrazines underwent this transformation smoothly in an undivided cell, providing the corresponding aryl-substituted quinoxalin­(on)­es in moderate to good yields. A radical mechanism is involved in this arylation reaction

Electrochemical Oxidative C–H Arylation of Quinoxalin(on)es with Arylhydrazine Hydrochlorides under Mild Conditions

A practical and scalable protocol for electrochemical arylation of quinoxalin­(on)­es with arylhydrazine hydrochlorides under mild conditions has been developed. This method exhibits high efficiency, easy scalability, and broad functional group tolerance. Various quinoxalin­(on)­es and arylhydrazines underwent this transformation smoothly in an undivided cell, providing the corresponding aryl-substituted quinoxalin­(on)­es in moderate to good yields. A radical mechanism is involved in this arylation reaction

Levels of Salivary Enzymes of <i>Apolygus Lucorum</i> (Hemiptera: Miridae), From 1^st Instar Nymph to Adult, and Their Potential Relation to Bug Feeding

<div><p>In recent years, <i>Apolygus lucorum</i> has caused increasing damage to cotton and fruit trees in China. The salivary enzymes secreted by <i>A</i>. <i>lucorum</i> when sucking on host plants induce a series of biochemical reactions in plants, and the pre-oral digestion benefits the bug feeding. In this study, the food intake of <i>A</i>. <i>lucorum</i> from 1^st instar nymphs to adults was measured, and the corresponding salivary activity of pectinase, amylase, cellulase, protease, polyphenol oxidase and peroxidase was determined. Daily food intake varied with developmental stage, peaking in 3^rd and 4^th instar nymphs. Pectinase, amylase, cellulase and protease were detected in both nymphal and adult saliva of <i>A</i>. <i>lucorum</i>, while neither polyphenol oxidase nor peroxidase was detected. Protease activity varied with food intake peaking at the 3^rd-4^th instar, and then slightly decreasing at the 5^th instar. Levels of pectinase, amylase and cellulase increased significantly with the daily feeding level until the 3^rd instar, corresponding with increasing damage to host plants. The activity of both cellulase and protease had a significant linear relationship with the average daily food intake. The increasing activity of enzymes in saliva explain stage-specific impacts of <i>A</i>. <i>lucorum</i> on the host plants, and suggest that optimal management of <i>A</i>. <i>lucorum</i> would be confined to its control threshold prior to the peak of daily feeding in the 3^rd instar.</p></div

Adapted finite difference schemes advection-reaction-diffusion problems generating periodic wavefronts

The talk is focused on the numerical integration of advection-reaction-diffusion problems by finite difference schemes adapted to problem. In other terms, the numerical scheme, exploiting the a-priori knowledge of the qualitative behaviour of the solution, gains ad- vantages in terms of efficiency and accuracy with respect to classic schemes already known in literature. The adaptation is here carried out through the so-called trigonometrical fitting technique for the discretization in space, giving rise to a system of ODEs whose vector field contains both stiff and non-stiff terms. Due to this mixed nature of the vector field, an Implicit-Explicit (IMEX) method is here employed for the integration in time, based on the first order forward-backward Euler method. The coefficients of the method introduced rely on unknown parameters which have to be properly estimated: such an estimate is performed by minimizing the leading term of the local truncation error in an efficient way. The effectiveness of this problem-oriented approach is shown through a rigorous theoretical analysis and some numerical experiments. References [1] R. D’Ambrosio, M. Moccaldi and B. Paternoster, Adapted numerical schemes for advection-reaction-diffusion problems generating periodic wavefronts, Comp. Math. Appl. (2017). [2] A.J. Perumpanani, J.A. Sherratt, P.K. Maini, Phase differences in reac- tion–diffusion–advection systems and applications to morphogenesis, J. Appl. Math. 55, 19-33 (1995)

The daily and total (within life stage) food consumption (as mg) of <i>A</i>. <i>lucorum</i> when fed green bean pods at 25 ± 1°C, with a 16:8 h L:D photoperiod and 70 ± 5% relative humidity.

<p>The daily and total (within life stage) food consumption (as mg) of <i>A</i>. <i>lucorum</i> when fed green bean pods at 25 ± 1°C, with a 16:8 h L:D photoperiod and 70 ± 5% relative humidity.</p

Proteinase activity from saliva of different life stages of <i>A</i>. <i>lucorum</i> when fed artificial sugar solutions between layers of parafilm.

<p>Stages with different letters are significantly different at <i>P</i> = 0.05.</p

Correlation of digestive enzyme levels in samples to life stage food intake

<p>Correlation of digestive enzyme levels in samples to life stage food intake</p