On the ‘true position’ of hydrogen in the Periodic Table

Several attempts have recently been made to point to ‘the proper place’ for hydrogen (sometimes also helium) in the Periodic Table of the elements. There are altogether five different types of arguments that lead to the following conclusions: (1) hydrogen should be placed in group 1, above lithium; (2) hydrogen should be placed in group 17, above fluorine; (3) hydrogen is to be placed in group 14, above carbon; (4) hydrogen should be positioned above both lithium and fluorine and (5) hydrogen should be treated as a stand-alone element, in the center of the Periodic Table. Although all proposals are based on arguments, not all of them sound equally convincing. An attempt is made, after critical reexamination of the arguments offered, to hopefully point to the best possible choice for the position of hydrogen. A few words are also mentioned on the structure of the Periodic Table and the (novel) attempts to reorganize it.     

Correction to: Peculiarities of chromium electrodeposition from water − dimethylformamide solutions

Journal of Solid State Electrochemistry - This original article contained a mistake. The page numbers of reference Kuznetsov et al. 2000 are incorrect, “853–858” should be...     

THE STABILITY OF THREE-PHASE EMULSIONS

Three lines below the address, the title ABSTRACT should betyped (capitalized and centered on the page). This should be followed by asingle-spaced, maximum ISO-word abstract concisely summarizing the paper tofollow. Allow three lines of space below the abstract before beginning thearticle itself.     

Erratum to: Effect of High-Temperature Gas-Chemical Modification on the Structural and Functional Properties of Carbon Black Particles

Russian Journal of Applied Chemistry - Figure 6 in the page 1980 should be replaced     

A nucleotide composition constraint of genome sequences

Let a, c, g and t denote the occurrence frequencies of A, C, G and T, respectively, in a genome. We calculated the statistical quantity S = a2 + c2 + g2 + t2 for each of 809 genomes (11 archaea, 42 bacteria, 3 eukaryota, 90 phages, 36 viroids and 627 viruses) and 236 plasmids. We found that S < 1/3 is strictly valid for almost all of the above genomes or plasmids. As a direct deduction of the above observation, it is shown that (i) the statistical quantity S is a kind of genome order index, which is negatively correlated with the Shannon H function; (ii) S < 1/3 suggests that a minimal value of the Shannon H function is required for each genome; (iii) S defined above would be a new biological statistical quantity, useful to describe the composition features of genomes; (iv) By jointly considering the Chargaff Parity Rule 2, it is shown that the genomic G + C content should be in between 0.211 and 0.789.     

Direct dynamics simulations of O(3P) + HCl at hyperthermal collision energies

The dynamics of the O(3P) + HCl reaction at hyperthermal collision energies were investigated using the quasiclassical trajectory method. Stationary points on the OClH 3A" and 3A' potential energy surfaces (PESs) were also examined. The lowest transition state leading to OCl + H on the 3A" surface is 2.26 eV above the reagents at the CCSD(T)/cc-pVTZ level of theory. This saddle point is bent and product-like. Direct dynamics calculations at the MP2/cc-pVTZ level of theory were used to investigate the excitation functions for OH + Cl, OCl + H, and O + H + Cl formation. OCl is formed mainly from small-impact-parameter collisions, and the OCl + H excitation function peaks around 5 eV, where it is similar in magnitude to the OH + Cl excitation function. The shape of the OCl + H excitation function is discussed, and features are identified that should be general to hyperthermal collision dynamics.     

Ab initio study of interaction-induced NMR shielding constants in mixed rare gas dimers

The interaction-induced contribution to the NMR shielding constants in homonuclear A2 and heteronuclear AB (A,B=He,Ne,Ar) dimers is obtained ab initio by employing a coupled cluster singles and doubles with perturbative treatment of triples wave function model and extended correlation-consistent basis sets. The second virial coefficients entering the expansion of the property with the density are then computed in a fully quantum mechanical approach, for temperatures ranging from the limit of dissociation of the dimer to well above standard conditions. The results can be used to describe the density and temperature dependence of the shielding constants in binary mixtures of helium, neon, and argon. The predicted effects should be observable for the interaction of 21Ne with other rare gases.     

Editorial board page for "SAR and QSAR in Environmental Research", Volume 4, Number 1

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 20, Number 2

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 17, Number 1

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 18, Number 1

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 21, Number 2

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 19, Number 1

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Diffusion in atactic polystyrene above the glass transition point

Diffusivities and solubilities in the system n-pentane-polystyrene were measured for low penetrant concentrations at several temperatures above the glass transition temperature. The relatively sharp changes in the activation energy of diffusion and the heat of solution near 150°C. are interpreted tentatively as indicating that a second-order transition exists in atactic polystyrene above the glass transition temperature. Evidence indicating the existence of this transition has been obtained by other techniques and the effects observed in this study should also be present in the diffusion of other penetrants in polystyrene. Correlation of these and other available data for diffusion in polystyrene as a function of the molecular size of the penetrant indicates that specific thermodynamic interactions between polymer and penetrant have little influence on the diffusion process.     

Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 17, Number 2

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 21, Number 1

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Editorial board page for "SAR and QSAR in Environmental Research", Volume 3, Number 3

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Editorial board page for “Journal of Macromolecular Science,Part C: Reviews in Macromolecular Chemistry”, Volume 16, Number 2

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 19, Number 2

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Editorial board page for “Journal of Macromolecular Science—Reviews in Macromolecular Chemistry”, Volume 18, Number 2

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