Study on wound healing effect of low-carbon topical dressings with new green packaging

In order to verify the effect of the new green and low-carbon hydrogel dressing on promoting wound healing, this project applied a sodium alginate hydrogel dressing product containing Escherichia coli and taro toxin analgesic polypeptide (The specific ingredients of the dressing) to skin wounds in common rats. Effects of the hydrogel dressing on promoting skin wound healing was evaluated by observing the occurrence and frequency of behavioral changes in rats, observing wwhistological sections under a high-power microscope, changes in serum cytokine indicators, and Image J analysis of collagen fiber reconstruction ratios in tissue sections. Through comprehensive evaluation, it can be found that hydrogel dressing has analgesic, anti-inflammatory and anti-infection effects on rat wound surface, and acts on promoting wound healing, promoting the formation of new blood vessels in the damaged skin tissue area, promoting the growth of granulation tissue, and promoting the reconstruction of collagen fibers in wound tissue

Improvement of zinc substitution in the reactivity of magnetite coupled with aqueous Fe(II) towards nitrobenzene reduction

The reduction of nitrobenzene (NB) by Zn-substituted magnetite coupled with aqueous Fe(II) was studied. A series of Zn-substituted magnetites (Fe3-xZnxO4, x = 0, 0.25, 0.49, 0.74, and 0.99) were synthesized by a coprecipitation method followed by systematic analysis of the variation in structure and physicochemical properties of magnetite using XRD, TEM, TG, BET and XAFS. All of the samples had a spine] structure by Zn substitution. Zn2+ primarily occupied the tetrahedral sites, but a portion of them moved to the octahedral sites at higher Zn level. Zn substitution increased the BET specific surface area and surface hydroxyl amount. The electron balance indicated that the NB reduction was primarily through the heterogeneous reaction by Fe3-xZnxO4 and adsorbed Fe(II), where NB in aqueous solution was reduced by structural Fe2+ in magnetite recharged by adsorbed Fe(II). Various factors, such as aqueous Fe(II) concentration, magnetite stoichiometry and Zn level, were investigated to illustrate their effects on the reduction processes. Both the rate constant k(obs) and electron transfer amount illustrated that Zn substitution generally improved the reduction activity of the Fe3-xZnxO4/Fe(II) system, while overdose of Zn retarded the process. This issue was attributed to the variation in electron conductivity of Fe3-xZnxO4 and Zn2+ occupancy. (C) 2018 Elsevier Inc. All rights reserved

Effect of electron structure on the catalytic activity of LaCoO3 perovskite towards toluene oxidation

LaCoO3 perovskites with different spin states of Co3+ were prepared by calcination at 600-1000 degrees C. LaCoO3 with electron filling in the e(g) orbital at 1 exhibited a moderate interaction between the surface oxygen, resulting in the best catalytic activity. This was verified by the O p-band center

Development of ultrasound-assisted extraction of commonly used azole antifungals in soils

Azole antifungals in soil are of increasing concern. In this work, a stable, sensitive and reliable method was developed and validated for extraction of azole antifungal pharmaceuticals (clotrimazole, econazole, ketoconazole, and miconazole) and biocides (propiconazole and tebuconazole) in various soils. Ultrasound-assisted extraction using ammonified methanol was used to extract the azole antifungals from soils, which were then quantified by ultra-high-performance liquid chromatography-mass spectrometry. The total organic carbon content of soil was correlated with extraction efficiency. The extraction mechanism of azole antifungals in soils was also preliminarily illustrated. The presence of amino groups in the methanol extractant was important for efficient extraction. Recoveries ranged from 81.1% to 119.0% with relative standard deviations within 10%. The method quantification limits were in the range of 0.1-0.2 ng g(-1) (dry weight) in soils. The method was successfully applied to a batch determination of azole antifungals in soils with good recoveries of the surrogate standard ranging from 80.2% to 110.6%, with an average of 95.1% and relative standard deviations within 8.7%. Miconazole, econazole, tebuconazole and propiconazole were occasionally detected at several ng g(-1) (dry weight). This method is a valuable tool for investigating the occurrence, behavior, transport, and fate of azole antifungals in soil environments

Enhanced peroxymonosulfate activation by Cu-doped LaFeO3 with rich oxygen vacancies: Compound-specific mechanisms

The degradation reaction mechanisms of organic pollutants by peroxymonosulfate (PMS) activation processes remain controversial. In this study, Cu-doped LaFeO3 samples were prepared and used as heterogeneous catalysts of PMS for the degradation of pharmaceuticals. Compared to LaFeO3 (LFO), the increased catalytic activity of LaFe1-xCuxO3 (LFCO) samples was observed, among which LFCO-7.5 exhibited the best performance. The enhanced catalytic activity of LFCO-7.5 was attributable to the generation of abundant oxygen vacancies. Hydroxyl radicals, sulfate radicals, superoxide and singlet oxygen were detected in the LFCO-7.5/PMS system. However, selective effects of radical scavengers on the degradation of different pharmaceuticals and selective reactivity of singlet oxygen toward different pharmaceuticals indicate the existence of compound-specific degradation mechanisms in the LFCO-7.5/PMS system. Furthermore, possible degradation pathways of SDZ and the toxicity evolution were investigated during sulfadiazine (SDZ) degradation. This study further enhances our knowledge on the degradation reaction mechanisms of organic pollutants in PMS activation processes

Characteristics and Comparative Analysis of the Special-Structure (Non-Single-Circle) Mitochondrial Genome of <i>Capsicum pubescens</i> Ruiz & Pav

Chilean peppers, cultivated from Capsicum pubescens, are globally renowned as popular vegetable and spice crops. C. pubescens belongs to the Capsicum L. (pepper) family and is one of the five pepper cultivars grown in China. In this study, we assembled and annotated the complete mt genome of C. pubescens. We investigated several aspects of its genome, including characteristics, codon usage, RNA editing sites, repeat sequences, selective pressure, gene clusters, and phylogenetic relationships. Furthermore, we compared it with other plant mt genomes. The data we obtained will provide valuable information for studying evolutionary processes in the Capsicum genus and will assist in the functional analysis of Capsicum mitogenomes

Effect of oxygen and heating on aromas of pummelo (<i>Citrus maxima</i>) essential oil

<p><b>Objective</b>: To investigate effects of oxygen and heating on aromas and volatile components of pummelo essential oil (PEO). <b>Method</b>: The PEOs were analyzed by sensory evaluation, gas chromatography coupled with mass spectrometry (GC-MS), GC-olfactometry (GC-O) and sensory reconstruction analysis. <b>Results</b>: The PEO co-treated by oxygen and heating exhibited significant differences in both aromas and volatile compositions from those of the fresh, the nitrogen-protected, the heated and the oxygen-exposed PEOs. The strong sweet and floral notes of the oxygen and heating co-treated PEO were attributed to high concentration of limonene oxides; the strong minty note was resulted from the increase of <i>L</i>-carvone. <b>Conclusion</b>: The results indicate that limonene oxides and <i>L</i>-carvone could significantly change the aroma of PEO co-treatment by oxygen and heating, providing valuable information for the production and storage of aromatic products of PEO.</p