Ultra-electron-deficient azaacenes were synthesized via Buchwald-Hartwig coupling of ortho-diaminoarenes with chlorinated mellophanic diimide followed by oxidation the intermediate N,N’-dihydro compounds MnO2 or PbO2. The resulting cata-annulated bisimide have ultrahigh electron affinities first reduction potentials as low ?0.35 V recorded for a tetraazapentacene. Attempts to prepare tetrakis(d...

G. Clar 6n Rule versus Hückel 4n + 2 Rule 3464 H. Hydrocarbons versus Heteroatomic Systems 3465 IV. Hidden Treasures of Kekulé Valence Structures 3466 A. Conjugated Circuits 3467 B. Innate Degree of Freedom 3470 C. Clar Structures 3472 V. Graph Theoretical Approach to Chemical Structure 3473 A. Metric 3473 B. Chemical Graphs 3473 C. Isospectral Graphs 3473 D. Embedded Graphs 3475 E. Partial Ord...

We construct coherent states using sequences of combinatorial numbers such as various binomial and trinomial numbers, and Bell and Cata-lan numbers. We show that these states satisfy the condition of the resolution of unity in a natural way. In each case the positive weight functions are given as solutions of associated Stieltjes or Hausdorff moment problems , where the moments are the combinat...

Functionalization of the pro-cata positions of pentacene with groups held perpendicular to the aromatic plane, in this case through a rigid 1,3-dioxole unit, yields pentacene derivatives that are stable and soluble, and still maintain edge-to-face interactions in the solid state.

Burkholderia sp. NK8 grows abundantly on 3-chlorobenzoate (3CB),4-chlorobenzoate (4CB) and benzoate. The genes encoding the oxidation of (chloro)benzoates (cbeABCD) and catechol (catA, catBC), the LysR-type regulatory gene cbeR and the gene cbeE with unknown function, all of which form a single cluster in NK8, were cloned and analysed. The protein sequence of chlorobenzoate 1,2-dioxygenase (Cbe...

Cells of Dictyostelium discoideum are highly resistant to DNA damaging agents such as UV-light, gamma-radiation and chemicals. The genes encoding nucleotide excision repair (NER) and base excision repair (BER) enzymes are rapidly upregulated in response to UV-irradiation and DNA-damaging chemicals, suggesting that this is at least partially responsible for the resistance of this organism to the...

El objetivo de la presente investigación fue entrenar un grupo jueces en cata café taza. Se llevó a cabo el Laboratorio Evaluación Sensorial Universidad Pamplona. Las muestras suministradas los fueron preparadas acuerdo NTC 4883. La primera etapa del proceso consistió convocar estudiantes programa Ingeniería Alimentos Pamplona para ser candidatos conformar taza; quienes se les aplicaron pruebas...