ABSTRACT
Inorganic oxide materials such as TiO2 and ZnO have been extensively studied for environmental remediation, that operates through photo generated Reactive Oxygen Species (ROS) such as H2O2, ·OH and O2 - to decontaminate waste water. However, inorganic solid oxidants such as metal peroxides capable of generating ROS in aqueous solutions have not been studied for environmental remediation. Towards this objective, we have synthesized peroxides of Zn, Mg, and Ba and characterized these by powder X-ray diffraction, Transmission Electron Microscopy, UV-visible spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of these wide band gap semiconductors has also been investigated. The novelty of the work is in the use of these peroxides as chemical sources of ROS in aqueous suspensions in addition to their photochemical generation. Hence, these peroxides, in particular Ba, exhibit high photocatalytic activity, better than the well-known ZnO. The mechanisms of ROS generation and subsequent dye degradation are elucidated. ROS has been estimated and is correlated to the photocatalytic activity. This work reports for the first time BaO2 as potential photocatalyst.
ABSTRACT
It is of interest to investigate the effectiveness of a mindfulness-based stress reduction program on stress and salivary cortisol among substance abuse patients. There were 60 drug addicts who were receiving treatment at the addiction centre. Samples are divided into 30 drug abuse patient experimental and 30 substance abuse patient control groups using the simple random sampling approach. Salivary cortisol, a pre-test stress biomarker, was measured and used to analyse the results. The MBSR programme was administered over thecourse of eight weeks, with two 1-hour sessions held each day, with a cap of 15 participants. The biomarker for stress (salivary cortisol) will be obtained once again at the end of the program to assess the post-test level of perceived stress and compare it to the results. Patients showed improvements in stress level (p < 0.05) following the 8-week MBSR program. The mean level of blood cortisol in the experimental group was 18.08 (3.62), which was dropped to 7.54 (1.29) before the intervention. The mean cortisol level in the experimental group differs by 10.54 (3.45) between pre and post intervention following the intervention (p value is < 0.005). Thus, there is a difference between the experimental conditions before and after the intervention. The mean serum cortisol level in the pre-test is 17.30 (2.34) and the mean serum cortisol level in the post test is 17.15 (2.31) in the control group (p value is > 0.005). Data shows that there is a significant difference between the groups. MBSR may be a beneficial intervention for reducing stress, in Patients taking treatment in de addiction centre.
ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the protective efficacy of gossypin (3,3',4',5,7,8-hexahydroxyflavone 8-glucoside) by administering it intraperitoneally, for dose, time, and vehicle dependent effects against sulphur mustard (SM), administered through percutaneous route in mice.</p><p><b>METHODS</b>SM (diluted in PEG-300) was administered percutaneously. The protective efficacy of gossypin was evaluated by administering it intraperitoneally (50, 100, 200, and 400 mg/kg), in various vehicles (water, PEG-300 and DMSO), and time intervals (30 min prior, simultaneous and 2 h post). The time dependent protection of gossypin (200 mg/kg in PEG-300; i.p.) was also evaluated using selected biochemical variables (GSH, GSSG, MDA, total antioxidant status, Hb, WBC count, RBC count, glutathione peroxidase, glutathione reductase, and superoxide dismutase) and liver histology. The protection of gossypin by oral route was also evaluated against percutaneously administered SM.</p><p><b>RESULTS</b>The protection against systemic toxicity of SM (LD50 8.1 mg/kg) was better when gossypin was given with PEG-300 (8.0 folds) than DMSO (5.7 folds). No protection was observed when gossypin was administered with water. Good protection (8.0 folds) was observed when gossypin was administered (200 mg/kg in PEG-300; i.p.) at 30 min prior or simultaneous to SM exposure, but no protection was observed when gossypin was administered 2 h post to SM exposure. A significant weight loss was observed 7 days after SM administration (2 LD50), with a significant increase in RBC and Hb. A significant decrease in total antioxidant status of plasma, liver GSH and GSSG levels, and in the activities of glutathione peroxidase, glutathione reductase and superoxide dismutase was also observed 7 days after SM administration. SM treated mouse liver also showed necrosis. A significant protection was observed when gossypin (200 mg/kg in PEG-300; i.p.) was administered either as a pretreatment (30 min before) or simultaneous treatment, and not as a post treatment (2 h). The protective efficacy of gossypin was better through oral route when administered with DMSO (4.8 folds) than with PEG-300 (2.4 folds). No protection was observed when gossypin was administered orally with water.</p><p><b>CONCLUSION</b>Percutaneous administration of SM induces oxidative stress and gossypin can protect it as a prophylactic agent by intraperitoneal or oral routes.</p>
