Structural analysis of plasmid-mediated verotoxin gene producing non-o157 escherichia coli using molecular dynamic simulations

Plasmid-mediated Non-O157 VTEC is a pathogenic E. coli serotype, are responsible for many life-threatening diseases such as diarrhoea. The thermostable crystal structure has been widely sought after for industry and therapeutic applications through the structural analysis. The National Center for Biotechnology Information (NCBI) Genbank Database has been sourced to obtain plasmid-mediated Verotoxin genes producing non-O157 MN 696158 (Vtx1-1) and MN688720 (Vtx2) sequences. The tertiary structure of MN696158 (Vtx1-1) and MN688720 (Vtx2) was generated by operating MODELLER. The result exposed multiple templates during modelling processes have improved the local stereochemical quality of the produced models. The structural analysis also disclosed the similarities and differences between the models (Vtx1-1 and Vtx2). Furthermore, the thermal stability profile of plasmid-mediated non-O157 VTEC were studied. The molecular dynamics simulations of plasmid-mediated non-O157 VTEC structures (Vtx1-1 and Vtx2) illustrated the interactions between amino acids. On the other hand, Vtx1-1 and Vtx2 showed noticeable differences in their relative conformational flexibility and stability at elevated temperature. However, it is expected that the information of the thermal stable of plasmid-mediated non-O157 VTEC models can be used for potential vaccine candidate through protein engineering in future

Influence of winding angles on hoop stress in composite pressure vessels: Finite element analysis

Various pressure vessels from Type I to Type IV are used to store hydrogen and compressed natural gas (CNG) at high pressures. The polymeric liner in Type IV composite pressure vessels (CPVs) does not share the load, unlike those with metallic liners (Type III); hence, the composite layers share the entire load. The winding angles play a crucial role in tailoring the pressure-bearing properties of CPVs. This study investigated the effect of fiber winding angles on the hoop stress in Type IV CPVs using finite element (FE) analysis, and the advantage of multi-angle winding was realized. Stress analysis is vital to ensure that the vessel can withstand the intended operating conditions without undergoing failure. A series of finite element analyses (FEA) was carried out using the Abaqus FE simulation software to study the behavior of an anisotropic fiber-reinforced CPV with varied winding schemes. A stress analysis was performed, and various winding schemes were compared for different cases. The hoop stress in various configurations was documented to assess and compare various winding configurations