Chromium removal from solution by five photosynthetic bacteria isolates

Abstract

Biological method has been recognized as a low-cost and ecofriendly approach for removing heavy metals from aqueous wastes. In this study, the ability of five photosynthetic bacteria isolates (strains labeled SC01, HN02, SC05, JS01, and YN01) was examined for their ability to remove Cr from Cr-containing solutions. Furthermore, the possible removal mechanisms were elucidated by comparing chromium removal rates, antioxidant reaction, and accumulation of reactive oxygen species (ROS). Among the five bacteria, strains SC01 and SC05 presented the highest removal rates of chromium ions and the activity of cysteine desulfhydrase under Cr stress. They also showed lower levels of ROS and cell death than the other three bacteria strains under Cr stress. In addition, total bacteriochlorophyll content and activities of six antioxidant enzymes in SC01 were highest among these selected strains. On the contrary, strain HN02 presented the lowest level of Cr removal and the lowest activities of antioxidant enzymes. It also exhibited the highest level of ROS under Cr(VI) stress. Overall, these results show that the strains SC01 and SC05 have good Cr removal ability and could be used for removal of Cr in industrial effluents.

Fo-Shou-San Ameliorates Chronic Cerebral Hypoperfusion-Induced Cognitive Impairment in Mice by Regulating NRF2/HO-1 Pathway Against Ferroptosis

“…Serum levels of Malondialdehyde (MDA) (Beyotime, Shanghai, China), Superoxide Dismutase (SOD) (Nanjing Jiancheng Bioengineering Institute, Nanjing, Jiangsu, China) and Glutathione peroxidase (GSH-PX) (Nanjing Jiancheng Bioengineering Institute, Nanjing, Jiangsu, China) were performed by matching assay kits according to instructions [49][50][51]. Glutathione (GSH) activity, oxidized glutathione disulfide (GSSG) activity, the ratio of GSH/GSSG and total glutathione in corpus striatum were tested by the GSH and GSSG Assay Kit (Beyotime, Shanghai, China) [52].…”

Bioaccumulation and physiological changes in the fruiting body of Agaricus bisporus (Large) sing in response to cadmium

“…Under heavy metals stress, excessive reactive oxygen species (ROS) are produced in cells. Production of ROS that exceeds the neutralizing capacity of cells leads to peroxidation, a type of oxidative stress that induces pathological processes and ultimately cell death 41 . The antioxidant system consists of two main parts; namely antioxidant enzymes and antioxidants.…”

Phenotypic identification and numerical taxonomy of pigmented bacteria isolated from marine and freshwater aquatic at Yogyakarta, Indonesia

“…These bacteria have been isolated from diverse environments, including marine water [6], river [3], wastewater treatment [7], and domestic wastewater treatment [8]. This group of AAP is also known as potential pollutans bioremediations such as heavy metal [9,10], azo dye [7], and miscellaneous pollutants [11,12,13]. Yogyakarta is one of Provinces in Indonesia which is geographically located in the middle of the plains region flanked by neighboring districts with high character of Mount Merapi slope in the north and coastal areas in the south.…”