PRESERVATION OF PRE-HISTORIC MONUMENTS AND BUILDINGS FROM THE EFFECT OF DESERT VARNISH

Desert varnish is the thin red to black coating found on exposed rock surfaces in arid regions. Rajasthan, which is located on the western side of India and a part of the Great Indian Desert, has artistic and cultural traditions which reflect the ancient Indian way of life. There is a rich and varied folk culture and ancient monuments which are often depicted symbolic of the state. It makes Rajasthan very important for tourism perspective. Latterly, almost all prehistoric forts and monuments of Rajasthan are affected from dark coatings of desert varnish and losing their elegance and charm, which makes it very imperative to find suitable measures to bring back the attraction of these monuments

Python GUI programming: a complete reference guide : develop responsive and powerful gui applications with Pyqt and Tkinter

This Learning Path guides you through every concept necessary to create fully functional GUI applications using PyQt and Tkinter with only a few lines of code. You'll learn to design and build GUIs that are functional, appealing, and user-friendly using the powerful combination of Python and its GUI frameworks

The β-Glucoside (bgl) Operon of Escherichia coli Is Involved in the Regulation of oppA, Encoding an Oligopeptide Transporter

We report that the bgl operon of Escherichia coli, encoding the functions necessary for the uptake and metabolism of aryl-β-glucosides, is involved in the regulation of oligopeptide transport during stationary phase. Global analysis of intracellular proteins from Bgl-positive (Bgl+) and Bgl-negative (Bgl−) strains revealed that the operon exerts regulation on at least 12 downstream target genes. Of these, oppA, which encodes an oligopeptide transporter, was confirmed to be upregulated in the Bgl+ strain. Loss of oppA function results in a partial loss of the growth advantage in stationary-phase (GASP) phenotype of Bgl+ cells. The regulatory effect of the bgl operon on oppA expression is indirect and is mediated via gcvA, the activator of the glycine cleavage system, and gcvB, which regulates oppA at the posttranscriptional level. We show that BglG destabilizes the gcvA mRNA in vivo, leading to reduced expression of gcvA in the stationary phase. Deletion of gcvA results in the downregulation of gcvB and upregulation of oppA and can partially rescue the loss of the GASP phenotype seen in ΔbglG strains. A possible mechanism by which oppA confers a competitive advantage to Bgl+ cells relative to Bgl− cells is discussed