In this paper, we study the factorability of linear time-varying (LTV) lossless filters and filter banks. We give a complete characterization of all degree-one lossless LTV systems and show that all degree-one lossless systems can be decomposed into a time-dependent unitary matrix followed by a lossless dyadicbased LTV system. The lossless dyadic-based system has several properties that make it...

Light truck vehicles (LTV) are becoming more popular on US highways. This creates greater opportunity for collisions with passenger vehicles (PV). The mismatch in weight, stiffness, and height between LTV and PV has been surmised to result in increased fatalities among PV occupants when their vehicles collide with LTV. We reviewed cases of vehicle mismatch collisions in the Seattle Crash Injury...

Spondylolysis is a fracture in part of the vertebra with a reported prevalence of about 3-6% in the general population. Genetic etiology of this disorder remains unknown. The present study was aimed at identifying genomic mutations in patients with dysplastic spondylolysis as well as the potential pathogenesis of the abnormalities. Whole-exome sequencing and functional analysis were performed f...

STUDY DESIGN The authors conducted a retrospective study involving description of a new surgical technique. OBJECTIVES The objective of this study was to describe and evaluate the efficacy of a new technique to stabilize the spine of young and small patients with congenital scoliosis after lumbosacral hemivertebra excision. SUMMARY OF BACKGROUND DATA Congenital scoliosis develops as the res...

Lactivicin (LTV) is a natural non-beta-lactam antibiotic that inhibits penicillin-binding proteins and serine beta-lactamases. A crystal structure of a BS3-LTV complex reveals that, as for its reaction with PBPs, LTV reacts with the nucleophilic serine and that cycloserine and lactone rings of LTV are opened. This structure, together with reported structures of PBP1b with lactivicins, provides ...