Rat Aspartate Aminotransferase ELISA Kit

In this study, relative humidity (RH) cycling accelerated stress testing (AST) is pursued on a supplier's catalyst coated membrane (CCM). The experimental design includes three RH cycles and two test cell/membrane electrode assembly (MBA) formats. All three cycles tested are shorter than the Department of Energy (DOE) protocol and model simulations indicate that deep and fast hydration swings could still he retained. Edge failure is observed in one test cell, which is in part responsible for the shorter lifetime in RH cycling as compared to using another test cell and suggests a test hardware harmonization if the lifetime is referenced to a target or compared between different materials. Nevertheless, the trends of H-2 crossover versus the number of cycles and overall test time remain consistent for two hardware formats. This finding suggests that RH cycling could be effectively used to investigate a control factor, such as cycle duration, based on a single hardware and material, towards the development of system strategies on a fuel cell vehicle. Furthermore, since the H-2 crossover versus RH cycling test time plots exhibit clear separation for three cycles, the frequency and duration of cycles both play a role in determining the membrane lifetime.

Introduction: Alcohol consumption is a major cause of liver disease worldwide. The amount of alcohol ingested is the most important risk factor for the development of Alcoholic Liver Disease (ALD). Osteopontin (OPN) is an extracellular matrix protein that is markedly up-regulated in patients with ALD. Aim: To determine the best predictor of ALD among Serum Aspartate Transaminase (AST)/Alanine Transaminase (ALT) ratio, Alkaline Phosphatase (ALP), Gamma Glutamyl Transferase (GGT) and serum OPN. Materials and Methods: Clinically diagnosed cases of ALD (N=60) with alcohol consumption >= 100 gm/day, for more than eight years and age and gender matched healthy controls (N=60) were recruited for the study. Estimation of AST, ALT, ALP and GGT were assayed by standard photometric methods in auto analyser ERBA-XL (EM-200) and plasma OPN was estimated by using commercial kit based on Enzyme-Linked Immunosorbent Assay (ELISA). Receiver Operator Characteristic (ROC) curve analysis was done to establish the best predictor of ALD among the markers. Results: The parameters of the liver function tests such as AST, ALT, ALP were significantly increased in the cases (p<0.001) as compared to controls. In the study, there was a significant increase in the level of OPN and GGT in the patients with ALD (p<0.001) as compared to controls. OPN showed significant positive correlations with AST (r=0.76, p<0.001), ALT (r=0.64, p<0.001), ALP (r=0.68, p<0.001). Upon ROC analysis, OPN had the maximum area (0.998) under curve as compared to GGT and AST/ALT ratio. Conclusion: OPN is a better predictor of ALD as compared to GGT and AST/ALT ratio.