We have constructed a multicopy plasmid that carries the uvrC gene of Escherichia coli. By inserting the transposon Tn1000 (previously designated gamma delta) into this plasmid, we obtained many derivatives that fail to complement uvrC34. The proteins synthesized by the original plasmid and the uvrC::Tn1000 derivatives were labeled in maxicells and analyzed on gels, demonstrating that a protein...

In this study, microcrystalline cellulose (MCC) was modified to oxidized (OC), 6-deoxycellulose hydrazide and (N,N-diethyl)amine (MCC-Hyd MCC-DEM) derivatives employed as supporting material for the synthesis of copper nanoparticles (NPs). Copper ions from aqueous solution were adsorbed then reduced zero valent (ZVC) NPs using sodium borohydride on films prepared derivatives. The characterizati...

Acid-catalyzed hydrolysis of glycosidic bonds is the most important degradation mechanism affecting cellulose-based materials. It results in decrease DP and loss original mechanical properties. The neutralization acidity therefore one efficient ways to hamper cellulosic artworks. However, case acidic strongly degraded artifacts, addition deacidification, a consolidation treatment must be perfor...

Cellulose derivatives containing associating hydrophobic groups along their hydrophilic backbone are used as rheology modifiers in the formulation of water-based spray paints, medicinal sprays, cosmetics and printable inks. Jetting and spraying applications of these materials involve progressive thinning and break-up of a fluid column or sheet into drops. Strong extensional kinematics develop i...