Background: Small colony variants (SCVs) are biotypes of bacteria that have a size of approximately one-tenth or less of the wild types and has distinct characteristics comparing to the wild type strains. Clinical SCVs are usually associated with persistent infection and require a long-term treatment program with antibiotics. In Saudi Arabia, there are few studies about SCVs Escherichia coli for this reason, this study is aimed to investigate the ability of gentamicin to mutate E.
View Article and Find Full Text PDFThis study investigated the genetic differences between subspecies ( () and ()) from Sudan using the NADH dehydrogenase subunit 4 () mitochondrial gene marker. Nineteen distinct haplotypes of the were identified in female mosquitoes from the study sites. The phylogenetic relationship of the 19 haplotypes was demonstrated in a median-joining haplotype network tree with and populations found to share three haplotypes.
View Article and Find Full Text PDFis the most important arboviral disease vector worldwide. In Africa, it exists as two morphologically distinct forms, often referred to as subspecies, and . There is a dearth of information on the distribution and genetic diversity of these two forms in Sudan and other African Sahelian region countries.
View Article and Find Full Text PDFPurpose: To evaluate the color stability of esthetic restorative materials after immersion in mouthwashes and accelerated aging.
Materials And Methods: Compomers and resin-based composites (RBC) were measured at baseline and repeatedly after immersion in three kinds of mouthwash (Listerine, Peridex, Rembrandt Age Defying) for 24 hrs and 7 days, and after aging for 150 kJ/m2. Color was measured according to CIE L*a*b* color scale on a reflection spectrophotometer.