نتایج جستجو برای: random benzenoid chain

تعداد نتایج: 569245  

Journal: :iranian journal of mathematical chemistry 2012
i. gutman

a recently published paper [t. došlić, this journal 3 (2012) 25-34] considers the zagrebindices of benzenoid systems, and points out their low discriminativity. we show thatanalogous results hold for a variety of vertex-degree-based molecular structure descriptorsthat are being studied in contemporary mathematical chemistry. we also show that theseresults are straightforwardly obtained by using...

Journal: :Proyecciones (Antofagasta) 2019

2007
Ivan Gutman Peter Paule

We predict the number of hexagonal systems consisting of 24 and 25 hexagons to be H 24 = 122237774262384 and H 25 = 606259305418149, with 6 and 5 signiicant digits, respectively. Further estimates for H n up to n = 31 are also given. Informally speaking, a hexagonal system can be viewed as a connected arrangement of hexagonal cells packed in the same way as the typical honeycomb arrangement in ...

2004
Ivan Gutman Peter Paule

We predict the number of hexagonal systems consisting of and hexagons to be H and H with and signi cant digits respectively Further estimates for Hn up to n are also given Hexagonal Systems Informally speaking a hexagonal system can be viewed as a connected arrangement of hexagonal cells packed in the same way as the typical honeycomb arrangement in a bee hive More formally it is a nite connect...

Journal: :Abhandlungen Aus Dem Mathematischen Seminar Der Universitat Hamburg 2021

We introduce a model for random chain complexes over finite field. The randomness in our complex comes from choosing the entries matrices that represent boundary maps uniformly \(\mathbb {F}_q\), conditioned on ensuring composition of consecutive is zero map. then investigate combinatorial and homological properties this complex.

Journal: :Chemical communications 2004
Chi-Keung Lam Mei-Fun Cheng Chi-Lun Li Jie-Peng Zhang Xiao-Ming Chen Wai-Kee Li Thomas C W Mak

The non-benzenoid aromatic D(5h) and enediolate C(2v) form of C5O5(2-) have been stabilized by hydrogen bonding with urea and 1,3-dimethylurea, respectively, in the host lattices of two novel crystalline inclusion compounds.

Journal: :Angewandte Chemie 2023

Non-alternant non-benzenoid hydrocarbons exhibit very different optical and electronic properties than their well-studied benzenoid analogues. However, preparing such structures with extended conjugation length, remains challenging. Herein, we report the synthesis of azuleno[2,1,8-ija]azulene derivatives using a two-step sequence involving four-fold aldol condensation between aromatic dialdehyd...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1978
H E Auer T N Thompson

Titrations of actinomycin D (AMD) with dG and with dG-dC were monitored by circular dichroism at 380 nm and 470 nm. These wavelengths are sensitive predominantly to nucleotide binding processes at the benzenoid and quinoid portions, respectively, of the phenoxazone ring of the drug chromophore [Auer, H.E., Pawlowski-Konopnicki, B.E., Chiao, Y.C.C. & Krugh, T.R. (1978), Biopolymers, 17, 1891-191...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Anthony V Qualley Joshua R Widhalm Funmilayo Adebesin Christine M Kish Natalia Dudareva

Despite the importance of benzoic acid (BA) as a precursor for a wide array of primary and secondary metabolites, its biosynthesis in plants has not been fully elucidated. BA formation from phenylalanine requires shortening of the C(3) side chain by two carbon units, which can occur by a non-β-oxidative route and/or a β-oxidative pathway analogous to the catabolism of fatty acids. Enzymes respo...

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