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Nenad Trinajstić
Nenad Trinajstić (26 October 1936 – 27 August 2021) was a Croatian chemist and one of pioneers of the chemical graph theory. Life and work Trinajstić was born in Zagreb. He received M.Sc. and D.Sc. degrees from the University of Zagreb based on work done at the University of Sheffield under John Murrell. His doctoral advisor was Milan Randić. From 1968 to 1970 he was a Postdoctoral fellow under Michael J. S. Dewar at the University of Texas, Austin with whom he has published 16 papers. He worked at Pliva and Ruđer Bošković Institute eventually becoming a full research professor in 1977 and from 2001 professor emeritus at the University of Zagreb. His scientific interests are quantum chemistry, mathematical chemistry, chemoinformatics, history of chemistry and philosophy of natural science. He wrote the first monograph on chemical graph theory and introduced several molecular descriptors such as 3-dimensional Wiener index and Zagreb indices (with Ivan Gutman), which are am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Graph Theory
Chemical graph theory is the topology branch of mathematical chemistry which applies graph theory to mathematical modelling of chemical phenomena. The pioneers of chemical graph theory are Alexandru Balaban, Ante Graovac, Iván Gutman, Haruo Hosoya, Milan Randić and Nenad Trinajstić (also Harry Wiener and others). In 1988, it was reported that several hundred researchers worked in this area, producing about 500 articles annually. A number of monographs have been written in the area, including the two-volume comprehensive text by Trinajstić, ''Chemical Graph Theory'', that summarized the field up to mid-1980s. The adherents of the theory maintain that the properties of a chemical graph (i.e., a graph-theoretical representation of a molecule A molecule is a group of two or more atoms that are held together by Force, attractive forces known as chemical bonds; depending on context, the term may or may not include ions that satisfy this criterion. In quantum physics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Descriptor
Molecular descriptors play a fundamental role in chemistry, pharmaceutical sciences, environmental protection policy, and health researches, as well as in quality control, being the way molecules, thought of as real bodies, are transformed into numbers, allowing some mathematical treatment of the chemical information contained in the molecule. This was defined by Todeschini and Consonni as: "''The molecular descriptor is the final result of a logic and mathematical procedure which transforms chemical information encoded within a symbolic representation of a molecule into a useful number or the result of some standardized experiment.''" By this definition, the molecular descriptors are divided into two main categories: experimental measurements, such as log P, molar refractivity, dipole moment, polarizability, and, in general, additive physico-chemical properties, and theoretical molecular descriptors, which are derived from a symbolic representation of the molecule and can be fur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Croatian Chemists
Croatian may refer to: *Croatia *Croatian language *Croatian people *Croatians (demonym) See also * * * Croatan (other) * Croatia (other) * Croatoan (other) * Hrvatski (other) * Hrvatsko (other) * Serbo-Croatian (other) Serbo-Croatian, Croato-Serbian, Serbo-Croat or Croato-Serb, refers to a South Slavic language that is the primary language of Serbia, Croatia, Bosnia and Herzegovina, and Montenegro, as well as a minority language in Kosovo Kosovo, officiall ... {{disambiguation Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 Deaths
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked below. 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 Earlier years ''Deaths in years earlier than this can usually be found in the main articles of the years.'' See also * Lists of deaths by day * Deaths by year (category) {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1936 Births
Events January–February * January 20 – The Prince of Wales succeeds to the throne of the United Kingdom as King Edward VIII, following the death of his father, George V, at Sandringham House. * January 28 – Death and state funeral of George V, State funeral of George V of the United Kingdom. After a procession through London, he is buried at St George's Chapel, Windsor Castle. * February 4 – Radium E (bismuth-210) becomes the first radioactive element to be made synthetically. * February 6 – The 1936 Winter Olympics, IV Olympic Winter Games open in Garmisch-Partenkirchen, Germany. * February 10–February 19, 19 – Second Italo-Ethiopian War: Battle of Amba Aradam – Italian forces gain a decisive tactical victory, effectively neutralizing the army of the Ethiopian Empire. * February 16 – 1936 Spanish general election: The left-wing Popular Front (Spain), Popular Front coalition takes a majority. * February 26 – February 26 Incident (二・二六事件, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Večernji List
(also known as '; ) is a Croatian and Bosnian-Herzegovinian daily newspaper published in Zagreb and Mostar. History and profile was started in Zagreb in 1959. Its predecessor ' ('Evening Courier') appeared for the first time on 3 June 1957 in Zagreb on 24 pages but quickly merged with ' ('National Paper') to form what is today known as . is considered a conservative leaning newspaper. Editions formerly had multiple regional and two foreign editions: * Dalmatia * Istria- Primorje-Lika * Slavonia and Baranja * Podravina and Bilogora * Varaždin and Međimurje * Zagorje * Sisak * Karlovac * Zagreb * Bosnia and Herzegovina * International edition In 2012, all of the Croatian regional editions were merged, so four editions remain: Zagreb, Croatia, Bosnia-Herzegovina and World. ''Croatia to the World'' In February 2021, ', in collaboration with the Academy of Fine Arts and the Croatian Society of Fine Artists (HDLU), compiled a list of the 38 Croatians (ethnically Croat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Academy Of Mathematical Chemistry
The International Academy of Mathematical Chemistry (IAMC) was founded in Dubrovnik, Croatia, in 2005 by Milan Randić. It is an organization for chemistry and mathematics avocation; its predecessors have been around since the 1930s. There are 88 Academy members () from around the world (27 countries), comprising six scientists awarded the Nobel Prize. Governing body of the IAMC * 2005–2007: ** President: Alexandru Balaban ** Vice-president: Milan Randić ** Secretary: Ante Graovac ** Treasurer: Dejan Plavšić * 2008–2011: ** President: Roberto Todeschini ** Vice-president: Tomaž Pisanski ** Secretary: Ante Graovac ** Treasurer: Dražen Vikić-Topić ** Member: Ivan Gutman ** Member: Nikolai Zefirov * since 2011: ** President: Roberto Todeschini ** Vice-president: Edward C. Kirby ** Vice-president: Sandi Klavžar ** Secretary: Ante Graovac ** Treasurer: Dražen Vikić-Topić ** Member: Ivan Gutman ** Member: Nikolai Zefirov * since 2019: ** President ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Croatian Academy Of Arts And Sciences
The Croatian Academy of Sciences and Arts (; , HAZU) is the national academy of Croatia. HAZU was founded under the patronage of the Croatian bishop Josip Juraj Strossmayer under the name Yugoslav Academy of Sciences and Arts (, JAZU) since its founder wanted to make it the central scientific and artistic institution of all South Slavs. Today, its main goals are encouraging and organizing scientific work, applying the achieved results, developing of artistic and cultural activities, carrying about the Croatian cultural heritage and its affirmation in the world, publishing the results of scientific research and artistic creativity and giving suggestions and opinions for the advancement of science and art in areas of particular importance to Croatia. The academy is divided into nine classes; social sciences, mathematical, physical and chemical sciences, natural sciences, medical sciences, philological sciences, Literature, Fine Arts, Musical Arts and Musicology, technical sciences ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Orbital Theory
In chemistry, molecular orbital theory (MO theory or MOT) is a method for describing the electronic structure of molecules using quantum mechanics. It was proposed early in the 20th century. The MOT explains the paramagnetic nature of O2, which valence bond theory cannot explain. In molecular orbital theory, electrons in a molecule are not assigned to individual chemical bonds between atoms, but are treated as moving under the influence of the atomic nuclei in the whole molecule. Quantum mechanics describes the spatial and energetic properties of electrons as molecular orbitals that surround two or more atoms in a molecule and contain valence electrons between atoms. Molecular orbital theory revolutionized the study of chemical bonding by approximating the states of bonded electrons – the molecular orbitals – as linear combinations of atomic orbitals (LCAO). These approximations are made by applying the density functional theory (DFT) or Hartree–Fock (HF) models to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aromaticity
In organic chemistry, aromaticity is a chemical property describing the way in which a conjugated ring of unsaturated bonds, lone pairs, or empty orbitals exhibits a stabilization stronger than would be expected from conjugation alone. The earliest use of the term was in an article by August Wilhelm Hofmann in 1855. There is no general relationship between aromaticity as a chemical property and the olfactory properties of such compounds. Aromaticity can also be considered a manifestation of cyclic delocalization and of resonance. This is usually considered to be because electrons are free to cycle around circular arrangements of atoms that are alternately single- and double- bonded to one another. This commonly seen model of aromatic rings, namely the idea that benzene was formed from a six-membered carbon ring with alternating single and double bonds (cyclohexatriene), was developed by Kekulé (see History section below). Each bond may be seen as a hybrid of a single bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resonance Energy
In chemistry, resonance, also called mesomerism, is a way of describing bonding in certain molecules or polyatomic ions by the combination of several contributing structures (or ''forms'', also variously known as ''resonance structures'' or ''canonical structures'') into a resonance hybrid (or ''hybrid structure'') in valence bond theory. It has particular value for analyzing delocalized electrons where the bonding cannot be expressed by one single Lewis structure. The resonance hybrid is the accurate structure for a molecule or ion; it is an average of the theoretical (or hypothetical) contributing structures. Overview Under the framework of valence bond theory, resonance is an extension of the idea that the bonding in a chemical species can be described by a Lewis structure. For many chemical species, a single Lewis structure, consisting of atoms obeying the octet rule, possibly bearing formal charges, and connected by bonds of positive integer order, is sufficient for des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
