NifA protein activates transcription of nitrogen fixation operons by the alternative sigma54 holoenzyme form of RNA polymerase.This protein binds to a well-defined upstream activator sequence (UAS) located at the -200/-100 position of nif promoters with the consensus motif TGT-N10-ACA.NifA of Azospirillum brasilense was purified in the form of a gl
Human rhinoviruses (HRVs) are associated with acute exacerbations in patients with chronic obstructive pulmonary disease (COPD) and asthma, which are accompanied by mucus hypersecretion.Whereas, various studies have shown that HRVs increase epithelial mucin production and thus may directly contribute to mucus hypersecretion.The effects of drugs use
We propose a novel scheme for read more designing and generating kaleidoscope-structured vector optical fields (KS-VOFs) by analogy with the principle of multiple mirror reflection in a kaleidoscope.For KS-VOFs with symmetric polarization states, we show the symmetry properties of the focal fields with various shapes for different applications.The
Sacral fractures in young healthy patients are usually iphone 14 price chicago linked to high-energy trauma.They are often associated with multiple other injuries.Isolated sacral fractures are rare and can be easily missed in the absence of other surrounding pelvic or spinal injuries.In this article, we present a rare case of isolated U-shaped disp
This work aims to study the thermal, mechanical and microstructural properties of an Al-0.60 wt% Mg-0.25 wt% Fe- -0.05 wt% Cu alloy for application as an electrical conductor.The ingots were cent dyyni obtained by unidirectional horizontal casting, and were sectioned in specific positions to the production of test specimens destined to mechanical t