Scanning force microscopy (SFM) has been used to study transcriptional activation of Escherichia coli RNA polymerase x sigma 54 (RNAP x sigma 54) at the glnA promoter by the constitutive mutant NtrC(D54E,S160F) of the NtrC Protein (nitrogen regulatory protein C). DNA-protein complexes were deposited on mica and images were recorded in air. The DNA template was a 726 bp linear fragment with two ...

Metallic nanomaterials are widely used in micro/nanodevices. However, the mechanically driven microstructure evolution in these nanomaterials is not clearly understood, particularly when large stress and strain gradients are present. Here, we report the in situ bending experiment of Ni nanowires containing nanoscale twin lamellae using high-resolution transmission electron microscopy. We found ...

An analytical and numerical solution for the free vibration of laminated polymeric composite plates with different layups is studied in this paper. The governing equations of the laminated composite plates are derived from the classical laminated plate theory (CLPT) and the first-order shear deformation plate theory (FSDT). General layups are evaluated by the assumption of cross-ply and angle-p...

Bending stiffness variation (BSV) is a common problem causing vibration in large rotating machinery. BSV describes lateral bending and its as function of the rotational angle. It has been observed that causes excitation exactly twice per revolution, which leads to problems, especially at half critical speed. caused by rotor geometry errors if material assumed be homogeneous linearly elastic. Th...

BACKGROUND Displaced lateral malleolar fractures are often treated with reduction and surgical stabilization. However, there has not been a comprehensive laboratory comparison to determine the most appropriate device for treating these patients. This study subjected a range of contemporary lateral fibular plates to a series of mechanical tests designed to reveal performance differences. METHO...

In this paper, a fully discretized bio-fidelity simulation model for biomechanical (kinematic) analysis of scoliosis for various patients was developed to analyze forces on vertebrae, loads acting on the intervertebral disc, corresponding angles between vertebrae, and tension in the spine muscles during lateral bending. It was further developed to study the movement limitation and muscle activa...