We study the generation number of massless fermions in compactifications recently found heterotic supergravity. The internal spaces are products two-dimensional constant curvature, and standard embedding is not assumed. constrained by equations motion Bianchi identity. In case that Euler characteristics three submanifolds $(2,\ensuremath{-}2,\ensuremath{-}2)$, or less. also show three-generatio...

background: to determine the efficacy of three different antiseptic solutions (control group (i), antibiotic solution – neomycin and polymyxin (ii), chlorhexidine 0.4% (iii), and povidone – iodine 10% (iv)) in disinfecting contaminated bone fragments. methods: under sterile conditions, the femora of 12 rabbits were removed and cut into six millimeter pieces. a total of 200 bone specimens were o...