a case o f intrahepatic stone and its t r eat ment i s present e d . the t ype s o f i ntrahepatic s tones , t h e etiological f act o r , t he ways of di agno s is and t reatment a re b eing discussed. the disease is common in far eastern c ountri es a nd asian are a, with c lonorchi s s i nens is inf estation, but s peci ally in iran when the s tones i s a lone in intrahepatic ducts without e...

UbiG is a SAM-dependent O-methyltransferase, catalyzing two O-methyl transfer steps for ubiquinone biosynthesis in Escherichia coli. UbiG possesses a unique sequence insertion between β4 and α10, which is used for membrane lipid interaction. Interestingly, this sequence insertion also covers the methyl donor binding pocket. Thus, the relationship between membrane binding and entrance of the met...

let s be a monoid and x a class of s-acts which is closed under coproducts. the object of this article is to find conditions under which all s-acts have x-precovering. we have shown that the existence of torsion-free precovering implies the existence of torsion-free covering. this work is an attempt to further facilitate the study of the conjecture that all s-acts have flat cover.

plotinus' attempt to counter the aristotle critiques on plato's theory of ideas, leads to his theory of emanation, which is called double act doctrine. plotinus is influenced by aristotle, not only in raising the problem of emanation quality, but the language and terms (including reasonable matter, indefinite dyad and activity) that are used to describe his theory. also, the theory of...

A monoid S satisfies Condition (A) if every locally cyclic left S-act is cyclic. This condition first arose in Isbell’s work on left perfect monoids, that is, monoids such that every left S-act has a projective cover. Isbell showed that S is left perfect if and only if every cyclic left S-act has a projective cover and Condition (A) holds. Fountain built on Isbell’s work to show that S is left ...