While S. marcescens is a rare cause of community-acquired infections, it has emerged as an important nosocomial healthcare-associated pathogen and a frequent source of outbreaks of hospital infection (72), in both adult (122) and paediatric patients (115).erratia marcescens is a member of the genus Serratia, which is a part of the family Enterobacteriaceae. Currently 14 species of Serratia are recognized within the genus, eight of which are associated with human infection (67).
The structure of nucleotide monomers. A nucleotide is made of a nucleobase (also termed a nitrogenous base), a five-carbon sugar (either ribose or 2-deoxyribose) depending on if it is DNA or RNA, and one or, depending on the definition, more than one phosphate groups.his nucleotide contains the five-carbon sugar deoxyribose, a nitrogenous base called adenine, and one phosphate group.
Nucleotides. Nucleotides are the building blocks of polymers called polynucleotides. Each nucleotide monomer consists of a pentose (five-carbon) sugar, to which is attached two other groups; a phosphate group and a nitrogenous base.The nitrogenous base is either a double ringed structure known as a purine or single ringed structure known as a pyrimidine.ach nucleotide monomer consists of a pentose (five-carbon) sugar, to which is attached two other groups; a phosphate group and a nitrogenous base. The nitrogenous base is either a double ringed structure known as a purine or single ringed structure known as a pyrimidine.