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Flue gas desulfurization gypsum (FGDG), a solid waste material generated by power plants, offers a cost-effective solution for preparing backfill materials. Concurrently, given that most backfill materials are exposed to mine water erosion, an investigation into the mechanical performance degradation and damage mechanisms of FGDG backfill materials subjected to prolonged chloride salt erosion is crucial for ensuring the stability of goaf backfills (by goaf, we mean the area or space that remains underground after the extraction of valuable minerals). This study explores the mechanical properties and damage mechanisms of backfill samples treated with varying concentrations of chloride. The findings indicate that over time, the mass of the sample initially decreases, experiences a slight increase, and then gradually declines. Simultaneously, the strength and structure of the sample deteriorate rapidly, followed by a partial recovery. The rebound in sample mass is attributed to an incomplete hydration reaction that continuously transforms free water into bound water. Microstructure analysis techniques, such as X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), reveals that the degradation in mechanical strength and structure is a consequence of chloride salt erosion. Subsequent reuse is facilitated by the formation of Friedel's salt resulting from the reaction between hydration products and chloride ions, filling voids in the sample and impeding further chloride ion erosion into the deeper regions. Notably, FGDG exhibits outstanding reuse performance in prolonged and high-concentration chloride ion environments. This study serves as a reference for understanding the deterioration mechanism and practical application of backfills in chloride-rich environments. [ABSTRACT FROM AUTHOR]

Alterations in membrane conformation/membrane topography of glycosylphosphatidylinositol (GPI) is caused by tissue specific differences in the membrane anchor. Analysis of folate receptors (FR) from murine L1210 leukemia cells indicated the presence of a significant affinity between FR and (6S)-N5-methyltetrahydrofolate compared to FR in L1210JF cells. Furthermore, fatty acyl substitutions on the inositol ring affected protein function due to conformational constraints in the membrane bound protein.

Purpose. This study sought to analyze the changes to clots and retinal tissue following direct infusion of tissue plasminogen activator (tPA) at different rates to the obstructed area of the retinal vein in an experimental animal model of retinal vein occlusion. Methods. The miniature pigs, which underwent unilateral retinal vein thrombosis generated by a combination of light illumination of the retinal vein and I.V. administration of rose Bengal, were randomly divided into two groups. In the experimental group (n = 45), balanced salt solutions + tPA were infused into the obstructed retinal vein at different rates (30,60, and 80ml/h) for 20 minutes (15 pigs in each subgroups). In the control group (n = 5), balanced salt solutions without tPA were infused. Retinal tissue and clots were evaluated by fundus photographic and histopathologic analysis. Results. Clot lysis occurred in 2/15, 9/15, and 10/15 pigs respectively following the 30, 60, and 80ml/h tPA infusion. Exudative retinal detachment appeared in 12/15 pigs after infusion of tPa at a rate of 80 ml/h. Retinal histopathology and transmission electron microscopy showed that endothelial cell tight junctions of retinal vein and capillaries were injured in pigs receiving the 80 ml/h tPA infusion. Conclusions. Experiments with our pig model suggests that the optimal infusion rate for the treatment of retinal vein thrombosis by direct tPA infusion is 60 ml/h for 20 minutes. [ABSTRACT FROM AUTHOR]

Presents a study which examined the composition of phengites in eclogites and their retrogressive derivatives of the Dabieshan Region. Eclogite petrography; Phengite textures of different generations; Phengite compositions.