In this paper, we introduce and study  a mapping from the collection of all  intermediate rings of $C(X)$ to the collection of all  realcompactifications of $X$ contained in $beta X$. By establishing the relations between this mapping and its converse,  we give a different approach to the main statements of De et. al. Using these, we provide different answers to the   four basic questions...

Given a completely regular Hausdorff space X, an intermediate ring A(X) is a ring of real valued continuous functions between C∗(X) and C(X). We discuss two correspondences between ideals in A(X) and z-filters on X, both reviewing old results and introducing new results. One correspondence, ZA, extends the well-known correspondence between ideals in C∗(X) and zfilters on X. The other, ZA, exten...

7,8-Dihydrobatrachotoxinin A is an intermediate in the synthesis of batrachotoxin, the extremely potent venom from the Colombian frog Phyllobates aurotaenia. A crystal structure analysis by x-ray diffraction has confirmed that the intermediate is identical with the natural batrachotoxinin A except for the saturation of the C(7)-C(8) bond. There are seven asymmetric carbon atoms in the molecule....

Let X be a completely regular topological space. An intermediate ring is a ring A(X) of continuous functions satisfying C∗(X) ⊆ A(X) ⊆ C(X). In Redlin andWatson (1987) and in Panman et al. (2012), correspondencesZ A andZ A are defined between ideals in A(X) and z-filters onX, and it is shown that these extend the well-known correspondences studied separately for C∗(X) andC(X), respectively, to ...

Let X be a completely regular topological space. An intermediate ring is a ring A(X) of continuous functions satisfying C∗(X) ⊆ A(X) ⊆ C(X). We give a characterization of C(X) in terms of extensions of functions in A(X) to real-compactifications of X. We also give equivalences of properties involving the closure in the real-compactifications of X of zero-sets in X; we use these equivalences to ...

Glutamate, a proposed precursor of the pyrrolidine ring of nicotine, was isolated and degraded after metabolism of 14C02 for 6 hours by Nicotiana rustica and Nicotiana glutinosa and after metabolism of acetate-2J4C for 2 hours by N. rustica. The 14C distribution in glutamate from N. glutinosa after 6 hours of W02 metabolism was 20.2, 14.3, 13.9, 24.4, and 26.6%, in C-l through C-5, respectively...

Electrophilic AlIII species have long dominated the aluminum reactivity towards arenes. Recently, nucleophilic low-valent AlI aluminyl anions showcased oxidative additions arenes C−C and/or C−H bonds. Herein, we communicate compelling evidence of an AlII radical addition reaction to benzene ring. The electron reduction a ligand stabilized precursor with KC8 in furnishes double ring instead bond...

A gene designated thnD, which is required for biodegradation of the organic solvent tetralin by Sphingomonas macrogoltabidus strain TFA, has been identified. Sequence comparison analysis indicated that thnD codes for a carbon-carbon bond serine hydrolase showing highest similarity to hydrolases involved in biodegradation of biphenyl. An insertion mutant defective in ThnD accumulates the ring fi...