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With increased consumers' demand for safe and healthy food, LED lighting for photobiology has received wider attention. In order to prolong the preservation time of the post-harvest lettuce, this paper documents a novel light source designed for preservation based on the chlorophyll absorption spectrum. Effects of intermittent exposure (35 μmol m−2 s−1) on sensory quality and chlorophyll content in fresh lettuce were investigated during 3 days storage at 20°C ± 1°C and 60% ± 1% humidity using dark as the control. The results show that the lighting reduced the colour difference value of lettuce by 23.5% compared with the dark. The content of chlorophyll was 19.7% more than in the dark. The lighting with the novel light source inhibited the decline in the colour difference value − a / b of lettuce and delayed the degradation of chlorophyll. [ABSTRACT FROM AUTHOR]

Ferroptosis is a kind of iron-dependent renewal programmed death. Its main mechanism is to catalyze the unsaturated fatty acids highly expressed on the cell membrane under the effect of divalent iron, to produce lipid peroxidation, thus inducing cell death. SLC7A11 is a known iron death-related factor. It has been proved that iron death is involved in the occurrence and development of acute diseases, but the specific mechanism is unknown. The purpose of this review is to highlight the regulatory properties of SLC7A11 and gain a deeper understanding of its role in ferroptosis-related acute injury diseases. This is a narrative review. PubMed was used as the main source to randomly implement literature search strategy to index Scopus articles. No specific terms are used. Studies have shown that SLC7A11 may affect the sensitivity of cells to iron ptosis by regulating it at the transcriptional or post-transcriptional level, which is related to the pathology of many acute injury diseases, such as acute lung injury (ALI), acute kidney injury (AKI), acute liver injury, myocardial ischemia-reperfusion injury, and acute cerebral hemorrhage. In order to clarify this point, more and more researchers turn their attention to the study of the specific mechanism between SLC7A11 and ferroptosis-related acute injury diseases. In summary, this review summarized some specific mechanisms by which ferroptosis could be controlled by SLC7A11 and clarified the underlying mechanisms of a series of diseases caused by SLC7A11-associated ferroptosis. It also provided more scientific justification for the clinical application of targeting ferroptosis in preventing and treating various diseases. [ABSTRACT FROM AUTHOR]

A new follow-up feed pulse current-assisted laser cladding process with a fibre laser was proposed. The conventional laser cladding and follow-up feed pulse current-assisted laser cladding were comparatively studied, and the influences of follow-up feed pulse current on the morphology, porosity, microstructure and cracks of the Ni60A Ni-based alloy coating prepared on the substrate surface of a 42CrMo structural alloy steel were analysed. Results showed that most current would be brought into the molten pool via the skin effect of pulse current when the follow-up feed electrode was used, thereby improving the current utilization efficiency. In addition, the approximate electrode distance could greatly increase the current density, enhance the improvement effect, and facilitate the preparation of a cladding coating with few defects and high quality. Compared with conventional laser cladding, the follow-up feed pulse currentassisted laser cladding could not only improve the cladding efficiency but also refine the grains at the cladding layer, reduce its porosity, and homogenize the microstructure of cladding layer; moreover, the dendritic crystal formed by the conventional laser cladding was transformed into isometric crystals. In the conventional laser cladding, the porosity was 0.62%, and the average grain size was approximately 6 µm. The two figures for the specimen obtained through the follow-up feed pulse current-assisted laser cladding were 0.39% and 4 µm. Meanwhile, the residual thermal stress and cracking sensitivity of the cladding layer could be reduced. Especially, online self-healing of cracks at the cladding layer could be realized by virtue of the flow-around effect and Joule heating effect formed by the high energy density pulse current, which was exclusive for the small electrode distance of follow-up feed electrodes at crack tip of the cladding layer and, thus, a crack-fee cladding layer was formed, and the easy cracking problem of laser cladding layer was solved. [ABSTRACT FROM AUTHOR]