common to both these compounds (Heath & Wildy, 1956a, b). These results indicated that this fungus forms ergothioneine by methylation and sulphuration of histidine. Subsequent work (Wildy & Heath, 1956, 1957) revealed that [2(ring)-14C]histamine would not serve as a precursor of the imidazole nucleus of either histidine or ergothioneine. Various metabolites of histamine, imidazoles possessing m...

background in recent decades, health care systems has greatly influenced by the technology development. the technology is helpful to enhance quality of care, reduce costs and improve patient care if appropriate training be applied for technology users. technology user’s training has been studied in some quantitative studies; however, a few investigators have studied the challenges which nurses’...

We revisit recent work of Heath-Brown on the average order of the quantity r(L1(x)) · · · r(L4(x)), for suitable binary linear forms L1, . . . , L4, as x = (x1, x2) ranges over quite general regions in Z. In addition to improving the error term in Heath-Brown’s estimate we generalise his result to cover a wider class of linear forms.

This paper examines the necessity of regulating the Iranian card payments system (SHAPARAK) based on the theory of two-sided markets. The expansion of the payment card system in recent years has arisen some questions regarding the role of all kinds of costs and expenses such as interchange fees, cardholder fees, merchant fees, and network externality in balancing the market. Since there is only...