In Escherichia coli and Salmonella enterica, the core oligosaccharide backbone of the lipopolysaccharide is modified by phosphoryl groups. The negative charges provided by these residues are important in maintaining the barrier function of the outer membrane. In contrast, Klebsiella pneumoniae lacks phosphoryl groups in its core oligosaccharide but instead contains galacturonic acid residues th...

This paper uses a novel data set obtained from an online dating service to draw inferences on mate preferences and to investigate the role played by these preferences in determining match outcomes and sorting patterns. The empirical analysis is based on a detailed record of the site users’ attributes and their partner search, which allows us to estimate a rich preference specification that take...

It has been almost half a century since David Gale and Lloyd Shapley published their pathbreaking paper “College admissions and the stability of marriage” in American Mathematical Monthly . It is hard to know whether Gale and Shapley expected the literature they initiated to be used to improve lives of masses of people all around the world. We are very fortunate to see that this is happening to...

of Thesis presented to COPPE/UFRJ and to TU/e as a partial fulfillment of the requirements for the degree of Doctor of Science (D.Sc.) ADAPTIVE HYPERMEDIA COURSES: QUALITATIVE AND QUANTITATIVE EVALUATION AND TOOL SUPPORT Vinicius Faria Culmant Ramos November/2013 Advisors: Geraldo Bonorino Xexéo Paul Maria Emile De Bra Department: Systems Engineering and Computer Science The focus of this work ...

An instance I of the Hospitals / Residents problem (HR) [6, 7, 15] involves a set R = {r1, . . . , rn} of residents and a set H = {h1, . . . , hm} of hospitals. Each hospital hj ∈ H has a positive integral capacity, denoted by cj . Also, each resident ri ∈ R has a preference list in which he ranks in strict order a subset of H. A pair (ri, hj) ∈ R ×H is said to be acceptable if hj appears in ri...

Recently we described the isolation of spontaneous bacteriophage K139-resistant Vibrio cholerae O1 El Tor mutants. In this study, we identified phage-resistant isolates with intact O antigen but altered core oligosaccharide which were also affected in galactose catabolism; this strains have mutations in the galU gene. We inactivated another gal gene, galE, and the mutant was also found to be de...