5,8-Didehydroisoquinolinium ion, a para benzyne analogue, was generated in a Fourier transform ion cyclotron resonance mass spectrometer, and its reactivity toward various neutral reagents was examined. A direct comparison of the reaction kinetics of the para benzyne, a meta isomer, and analogous monoradicals, indicates that the para benzyne is a poorer electrophile but a more reactive radical ...

The fluorocitrate isomer that is a strong inhibitor and inactivator of aconitase has been shown by x-ray crystallographic studies on the rubidium ammonium salt to have the configurations (1R : 2R) or (1S : 2S) 1-fluoro-2-hydroxy-1,2,3-propanetricarboxylic acid. A possible mechanism for the action of fluorocitrate is proposed which involves the 1R : 2R isomer suggested from biochemical data.

A novel methodology for the α-vinylation of amides with arylacetylenes under metal-free conditions has been introduced. This methodology provides a new protocol to synthesize allylamines. In each product, the amount of the cis-isomer was more than that of the trans-isomer.

Shell model calculations have been done for interpreting two representative isomeric states in neutron rich Sn region using SMN and SMPN Hamiltonians. They are, (i) 2.91 min isomer in Cs and (ii) the 0.57 μs isomer in Sb nuclei. The results are compared with those obtained with KH5082 and CW5082 Hamiltonians. How the results clearly distinguish the most appropriate interaction has been discussed.

Among the archaea, Methanococcus maripaludis has the unusual ability to use L- or D-alanine as a nitrogen source. To understand how this occurs, we tested the roles of three adjacent genes encoding homologs of alanine dehydrogenase, alanine racemase, and alanine permease. To produce mutations in these genes, we devised a method for markerless mutagenesis that builds on previously established ge...

The value of an isomer ratio (IR) in N=81 isotones (137Ba, 139Ce, 141Nd and 143Sm) is studied by means of the (γ, n) reaction. This quantity measures a probability to populate the isomer state in respect to the ground state population. In (γ, n) reaction giant dipole resonance (GDR) is excited and after its decay by neutron emission the nucleus has an excitation energy of a few MeV. The forthco...

The singular cochain complex of a topological space is a classical object. It is a Differential Graded algebra which has been studied intensively with a range of methods, not least within rational homotopy theory. More recently, the tools of Auslander-Reiten theory have also been applied to the singular cochain complex. One of the highlights is that by these methods, each Poincaré duality space...

[This corrects the article on p. 213 in vol. 22, PMID: 25009702.].

A combined structural/EPR/computational chemistry investigation is reported on the two paramagnetic hydrido-cluster salts [Rh(6)(PCy(3))(6)H(12)][BAr(F)(4)] and [Rh(6)(PCy(3))(6)H(14)][BAr(F)(4)], the latter being formed by reversible addition of H(2) to the former, [BAr(F)(4)](-) = [B{C(6)H(3)(CF(3))(2)}(4)](-). The solid-state structure of [Rh(6)(PCy(3))(6)H(14)][BAr(F)(4)] shows an expanded ...