The 13 Shiga-toxigenic Escherichia coli (STEC) strains isolated from wholesale spinach and lettuce consisted mostly of serotypes that have not been implicated in illness. Among these strains, however, were two O113:H21 that carried virulence genes common to this pathogenic serotype (stx(2), ehxA, saa, and subAB), suggesting that their presence in ready-to-eat produce may be of health concern.

This study presents three genomes of O91:H21 isolates, two from hemolytic uremic syndrome patients and one of porcine origin. Genome analyses reveal that one of the human isolates contains both Shiga toxin-encoding genes (stx1 and stx2), and all three isolates contain putative adhesin (iha and eaeH) and antibiotic resistance (ampC) genes.

The cycling of the radiatively important gas carbonyl sulfide (OCS) was studied in surface waters of the Sargasso Sea. In August 1999, surface OCS concentrations averaged 8.6 pmol L21, showed minor diel variations, and varied little with depth. An OCS precursor, total dissolved organic sulfur (DOS), was lowest at the surface (40 nmol L21) and increased with depth. The photoproduction rate of OC...

The paper provides an extension and a new proof of Deaton’s theorem on the undesirability of nonuniform excise taxation when income taxes are a¢ ne and preferences over consumption goods are separable from labour-leisure choices, homothetic, and identical across agents. Key Words: Optimal Excise Taxes, Atkinson-Stiglitz Theorem, Deaton’s Theorem JEL Classi…cation: H21

Differential tax analysis is used to show how the socially optimal fiscal-tax to liquidity-tax ratio changes with the relative size of the tax-evading hidden economy. The smaller the relative size of the hidden economy, the larger the optimal fiscal-tax to liquidity-tax ratio. The empirical cross-section and panel evidence supports this theoretical result. JEL: E31, E52, H21, O17

Differential tax analysis is used to show how the optimal mix of inflation tax and direct taxation changes with the relative size of the hidden economy. The larger the relative size of the hidden economy, the smaller the optimal ratio of direct tax to inflation tax. Anecdotal empirical evidence supports this result. JEL Classification: E62, H21, H26, O17.

abstract tax can be discussed from various aspects and in the meantime, evaluation the tax system performance is very important. this article try to point this out in 2005 and 2008 (the second and final year of the forth development plan) in the iranian economy and in provinces separately. to enable this comparison and homogeneity, iranian provinces are divided into three groups (developed, les...

This paper computes optimal top marginal tax rates in Bewley-Huggett-Aiyagari–type economies that include entrepreneurs. Consistent with the data, entrepreneurs are overrepresented at of income distribution and thus disproportionately affected by an increase rate. The rate maximizes welfare is 60 percent. While average gains positive similar across occupations along transition, they larger for ...

The massless spectrum of an orientifold of the IIB string theory is computed and shown to be identical to F theory on the Calabi-Yau threefold with h11 = 51 and h21 = 3. Target space duality is also considered in this model.

The paper evaluates the theoretical literature on public pension schemes. First, the terms pay-as-you-go and capital reserve are made precise. These two systems are then compared, followed by a consideration of their efficiency properties. Thereafter conversion policies are discussed. JEL-Classification: H21, H55