Escherichia coli of the O157 serogroup are comprised of a diverse collection of more than 100 O157:non-H7 serotypes that are found in the environment, animal reservoir and infected patients and some have been linked to severe outbreaks of human disease. Among these, the enteropathogenic E. coli O157:non-H7 serotypes carry virulence factors that are hallmarks of enterohemorrhagic E. coli, such a...

Food defense requires the means to efficiently screen large volumes of food for microbial pathogens. Even rapid detection methods often require lengthy enrichment steps, making them impractical for this application. There is a great need for rapid, sensitive, specific, and inexpensive methods for extracting and concentrating microbial pathogens from food. In this study, an immuno-magnetic separ...

We report the complete 43,359-bp sequence of the locus of enterocyte effacement (LEE) from EDL933, an enterohemorrhagic Escherichia coli O157:H7 serovar originally isolated from contaminated hamburger implicated in an outbreak of hemorrhagic colitis. The locus was isolated from the EDL933 chromosome with a homologous-recombination-driven targeting vector. Recent completion of the LEE sequence f...

This paper investigates the determinants of the real exchange rate (RER) in Ethiopia. In particular, it assesses whether large capital inflows (e.g. foreign aid and remittances) have an impact on the RER. This empirical exercise tries to improve the current literature in a number of ways: (i) the use of quarterly data provides a larger sample size and enables the modelling of important intra-ye...

Enterohemorrhagic Escherichia coli (EHEC) is a diarrheagenic pathogen that colonizes the gut mucosa and induces attaching-and-effacing lesions. EHEC employs a type III secretion system (T3SS) to translocate 50 effector proteins that hijack and manipulate host cell signaling pathways, which allow bacterial colonization and subversion of immune responses and disease progression. The aim of this s...

PCR products of 1.8 kb were generated with DNAs from all Escherichia coli H7 strains tested by using oligonucleotide primers which flank the fliC gene. Three RsaI digestion profiles of these PCR products were evident on agarose gels; the first occurred with serotype O55:H7, O157:H7, or nonmotile (NM) strains, the second occurred with serotype O1:H7 and O18:H7 strains, and the third occurred wit...

This paper focuses on the macroeconomic management of large inflows of foreign aid. It investigates the extent to which African countries have coordinated fiscal and macroeconomic responses to aid surges. In practice, we construct a panel dataset to investigate the level of aid ‘absorption’ and ‘spending’. This paper departs from the recent empirical literature by utilising better measures for ...

Polygyny rates are higher in Western Africa than in Eastern Africa. The African slave trades help explain this difference. More male slaves were exported in the trans-Atlantic slave trades from Western Africa, while more female slaves were exported in the Indian Ocean slave trades from Eastern Africa. The slave trades led to prolonged periods of abnormal sex ratios, which impacted the rates of ...

This paper studies the impact of a natural resource boom on structural change and real exchange rate dynamics, taking into account the indirect effect that operates through relative sectoral productivity changes. The paper's contribution to the Dutch disease literature is threefold. First, I extend the simple learning by doing productivity specification to include trade barriers and technology ...

Three issues are addressed in this paper. First, we use both household and macro data to establish how fast per capita consumption and incomes grew in Ghana in the 1990s. Second, we ask how much of the rise in incomes was due to rises in the level of human capital and how much reflected underlying technical progress. Third, we assess the implications of how incomes rose for the interpretation o...