Decomposition of refractory aniline aerofloat collector in aqueous solution by an ozone/vacuum-UV (O₃/VUV) process

The degradation of refractory aniline aerofloat (AAF) collector was investigated by an ozone/Vacuum-UV (O3/VUV) process. The effects of O3 dosage and initial pH on the AAF degradation were studied. The total organic carbon (TOC) and concentrations of SO42−, PO43− and NO3− anions were measured to evaluate the AAF mineralization. The solid phase extraction and gas chromatography–mass spectrometry (SPE/GC–MS) was developed to identify byproducts. The results showed that 99.84% of AAF could be removed by the O3/VUV, and the AAF degradation was enhanced at higher O3 dosage and initial solution pH. The radical scavenging tests revealed that most of AAF was degraded by OH• radicals, and the O3/UV254nm made the main contribution in AAF degradation in the O3/VUV system. The mineralization extents of C, S, P and N elements of AAF at 180 min reached 47.74%, 93.94%, 17.71% and 45.81%, respectively. At initial pH > 10.0, the EE/O values of AAF degradation by the O3/VUV was below 7.0 kWh m−3 per order, showing the energy consumption was acceptable. The SPE/GC–MS analysis showed that toxic aniline was generated in the O3/VUV oxidation of AAF, but it was further degraded at a longer time. Compared to the ozonation, the O3/VUV had a much lower content of aniline at 180 min. The possible degradation pathways of AAF by the O3/VUV were proposed.</p

Two new lipid analogues from the soft coral <i>Sinularia flexibilis</i>

<p>Soft corals of the genus <i>Sinularia</i> are widely distributed in the South China Sea. Two new lipid analogues (<i>Z</i>)-<i>N</i>-(3,4-dihydroxyphenethyl)-3-methyldo-dec-2-enamide (<b>1</b>) and (<i>E</i>)-1-(2,5-dihydroxy-4-methylphenyl)-6-acetoxy-2,3,7-trihydroxy-3,7,11,15-tetramethylhexadeca-11,14-dien (<b>2</b>), together with three known compounds (<b>3–5</b>) were isolated from the soft coral <i>Sinularia flexibilis</i>. Their structures were elucidated on the basis of extensive spectroscopic analysis, including one and two-dimensional NMR, MS, IR, UV, as well as by comparison with published data.</p

Table_1_Risk perception and mental health among college students in China during the COVID-19 pandemic: A moderated mediation model.DOCX

Since the outbreak of the COVID-19 epidemic, it has spread on a large scale around the world, seriously affecting people’s physical and mental health. In China, almost all schools have postponed semesters, suspended offline classes, and implemented closed-off management, which has brought significant challenges to the study and life of college students. The study aimed to explore the relationship between risk perception, perceived stress, perceived control, and mental health among Chinese college students. This cross-sectional study was conducted among 1,856 college students. The results showed that risk perception was positively correlated with mental health. After adding the mediating variable of perceived stress, risk perception still significantly predicted mental health. In addition, the interaction term of perceived stress and perceived control significantly negatively predicted mental health. Specifically, perceived stress significantly affected mental health in the low-perceived control group. In contrast, in the high-perceived control group, the predictive effect of perceived stress on mental health disappeared. The present study showed that perceived stress partially mediated the relationship between risk perception and mental health; perceived control moderated the relationship between perceived stress and mental health, and high perceived control could buffer the effect of perceived stress on mental health.</p

Inflammatory Cell Infiltration (ICI).

<p>Inflammatory Cell Infiltration (ICI).</p

Reparative Dentin Formation (RDF).

<p>Reparative Dentin Formation (RDF).</p

Immunohistochemical expression of DSP.

<p>(A): Representative immunohistochemical images of the blank control group, the Ca(OH)₂ group, and the DBM group. a: The blank control group. Pulp morphology was normal. b- f: Ca(OH)₂ group (1, 3, 7, 14, 28 days). g- k: DBM group (1, 3, 7, 14, 28 days). (B): Mean IOD value of DSP. *means significant differences.</p

Representative histological images of the Ca(OH)₂ and DBM groups (x100 magnification, H&E staining).

<p>A: The blank control group. Pulp morphology was normal. B-F: Ca(OH)₂ group (1, 3, 7, 14, and 28 days). G-K: DBM group (1, 3, 7, 14, and 28 days). Inflammatory reactions began from 1 day and continued to exist through the observation period. Reparative dentin formation could be observed in both groups on 28 days, and the DBM group showed more regular and thinner reparative dentin. Arrowheads indicate inflammatory reaction. RD means reparative dentin.</p

Results of the histopathological evaluation.

<p>ICI: Inflammatory cell infiltration, PTD: Pulp tissue disorganization, RDF: Reparative dentin formation.</p

Immunohistochemical expression of Runx2.

<p>(A): Representative immunohistochemical images of the blank control group, the Ca(OH)₂ group and the DBM group. a: The blank control group. Pulp morphology was normal. b- f: Ca(OH)₂ group (1, 3, 7, 14, 28 days). g- k: DBM group (1, 3, 7, 14, 28 days). (B): Mean IOD value of Runx2. *means significant difference.</p

Pulp Tissue Disorganization (PTD).

<p>Pulp Tissue Disorganization (PTD).</p