Abstract:
:The interpretation of mass spectra (ms) of molecules containing poly-isotopic elements (e.g. Ge, Se, W, Os, Sn, Te, Zn, Yb) can be difficult due to the occurrence of fragments resulting from isotopomeric composition. MS-clusters located in the range lower than or equal to M/2 are very difficult to interpret. In this area many perturbations may be observed. The coincidence of different fragmentation pathways, the existence of multiply charged ions, background levels, etc. can all contribute to this problem. The present paper reports the application of multi-isotopomeric analysis methods for low-resolution ms. We present a solution that may be useful for detection of the symmetrical decomposition of a molecule and for elucidation of cluster ion genesis. The complex character of the cluster does not perturb determination of the contents of the investigated pattern. In such cases the dominated component is applied in subsequent computations.
journal_name
J Mol Modeljournal_title
Journal of molecular modelingauthors
Goraczko AJ,Szewczykowska Kdoi
10.1007/s00894-009-0486-1subject
Has Abstractpub_date
2009-06-01 00:00:00pages
747-58issue
6eissn
1610-2940issn
0948-5023journal_volume
15pub_type
杂志文章abstract::Geometries and energies of formation of bilirubin formed by reduction of biliverdin via three meso carbon sites, the beta, gamma and delta positions, have been calculated using semiempirical methods. It has been shown that gamma-bilirubin with a ridge-tile conformation forms six intramolecular hydrogen bonds and is th...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-002-0078-9
更新日期:2002-04-01 00:00:00
abstract::Using density functional theory (DFT) and molecular dynamics (MD), we studied the interaction of a titanium atom with a half of a C60 fullerene (i.e., C30), formed from the corannulene structure with a pentagonal base. We considered atmospheric pressure and 300 K. We found that the most stable adsorption of the titani...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-016-3086-x
更新日期:2016-09-01 00:00:00
abstract::The feasibility of electron transport conduction through a guanine base of DNA was investigated and then compared with another component of DNA, i.e., cytosine. A mathematical approach based on the jellium model using non-equilibrium Green's function combined with semi empirical extended Huckel theory was applied usin...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-018-3856-8
更新日期:2018-11-01 00:00:00
abstract::Fully atomistic molecular dynamics simulation studies of thermotropic bilayers were performed using a set of glycosides namely n-octyl-β-D-glucopyranoside (β-C8Glc), n-octyl-α-D-glucopyranoside (α-C8Glc), n-octyl-β-D-galactopyranoside (β-C8Gal), and n-octyl-α-D-galactopyranoside (α-C8Gal) to investigate the stereochem...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-014-2165-0
更新日期:2014-03-01 00:00:00
abstract::Density functional theory (DFT) was used to investigate cobalt(0)-catalyzed intramolecular hydroacylation of 4-pentenal. The calculated results indicated the involvement of five possible reaction pathways: the formation of cyclopentanone, cyclobutanone, butylenes, cyclobutane, and cyclopropane, respectively. The forme...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-013-1772-5
更新日期:2013-06-01 00:00:00
abstract::The geometrical, conformational, and electronic properties of a series of D-π-A metal-free dyes designed for use as sensitizers in DSSCs were studied using DFT and TD-DFT methods. A substituted triphenylamine moiety was used as the donor group and 2-cyanoacrylic acid as the acceptor group in these dyes. They also cont...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-016-2978-0
更新日期:2016-05-01 00:00:00
abstract::Although molecularly targeted therapy with imatinib has improved treatments of chronic myeloid leukemia (CML), clinical resistance gradually develops in patients with accelerated or blast phase CML. The inability of imatinib to cure CML suggests that inactivation of BCR-ABL kinase activity alone is not sufficient to c...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-014-2399-x
更新日期:2014-08-01 00:00:00
abstract::The crystal structure of the human cystatin C (hCC) dimer revealed that a stable twofold-symmetric dimer was formed via 3D domain swapping. Domain swapping with the need for near-complete unfolding has been proposed as a possible route for amyloid fibril initiation. Thus, the interesting interactions that occur betwee...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-012-1609-7
更新日期:2013-02-01 00:00:00
abstract::Based on the unique advantages of terahertz (THz) spectrum on the detection of energetic cocrystals, the low-temperature dependent THz spectra of CL-20/TNT cocrystal were investigated by using molecular dynamics (MD) simulations from 5 to 296 K, as well as three different crystal faces, (001), (120), and (010). When t...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-019-4270-6
更新日期:2020-01-11 00:00:00
abstract::Effects of substituents on anion binding in different urea based receptors have been examined using density functional (B3LYP/6-311+G**) level of theory. The complexes formed by a variety of substituted urea with a halide anion (fluoride) and an oxy-anion (acetate) have been calculated. The stronger complexes were pre...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-010-0663-2
更新日期:2010-09-01 00:00:00
abstract::A computational study was carried out to characterize the hydrogen-bonded dimers of Zoledronate (ZOL), which is used widely in treating skeletal diseases. The stable conformations, hydrogen bonding interactions, IR spectra, thermodynamic properties, and electronic characteristics of nine possible ZOL dimers were studi...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-018-3826-1
更新日期:2018-10-09 00:00:00
abstract::In the present study, we analyze the interactions of NAD+-dependent deacetylase (Sir2 homolog yeast Hst2) with carba-nicotinamide-adenine-dinucleotide (ADP-HPD). For the Sir2 homolog, a yeast Hst2 docking procedure was applied. The structure of the protein-ADP-HPD complex obtained during the docking procedure was used...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-016-2992-2
更新日期:2016-06-01 00:00:00
abstract::The interaction between tetramethylcucurbit[6]uril (host) and 5,5'-dimethyl-2,2'-bipyridyl hydrochloride (guest) was studied by 1H NMR, X-ray crystallography, electronic absorption spectroscopy, fluorescence emission spectra and quantum chemistry calculations. This experimental-computational study that indicated the h...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-007-0243-2
更新日期:2007-12-01 00:00:00
abstract::Trocarin belongs to group D of prothrombin activators derived from snake venom of Tropidechis carinatus and is a rich non-hepatic source of Xa, the only known hepatic prothrombin activator. The structural and functional similarity with Xa makes trocarin an interesting target for exploring the structure-functional rela...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-002-0099-4
更新日期:2002-10-01 00:00:00
abstract::We investigated the dynamics of an electron subjected to a uniform electric field in the scope of a tight-binding electron-phonon interacting approach. We aimed at describing the transport in a one-dimensional lattice in which the on-site energies are distributed according to a Fibonacci sequence. Within this physical...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-019-3972-0
更新日期:2019-03-28 00:00:00
abstract::Quantum chemical calculations using density functional theory BP86/def2-TZVPP and ab initio methods at CCSD(T)/def2-TZVPP have been carried for the telluroketones H2A=Te (A = C, Si, Ge). DFT calculations have also been carried out for the ketones H2C=E (E = O, S, Se, Te) and for the complexes NHC → [H2A=Te] → B(C6F5)3...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-014-2433-z
更新日期:2014-10-01 00:00:00
abstract::A theoretical investigation of the adsorption of CO₂ onto ZrO₂ is presented. Various cluster models were used to mimic different basic and acidic sites on the surface. The method used was the density functional theory with the generalized gradient approximation and including Grimme's empirical model in order to proper...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-012-1486-0
更新日期:2012-11-01 00:00:00
abstract::Extremely extensive calculations of potential energy surfaces for the parallel-displaced configuration of pyridine dimer systems have been carried out using a dispersion-corrected density functional. Instead of focusing on stationary geometries these calculations provide much deeper insight into the "landscape" of the...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-017-3496-4
更新日期:2017-11-09 00:00:00
abstract::A molecular dynamics method was employed to study the binding energies associated with the cocrystallization (at selected crystal planes) of either 1,3,5-triamino-2,4,6-trinitro-benzene (TATB), 1,1-diamino-2,2-dinitroethylene, 3-nitro-1,2,4-triazol-5-one (TATB, FOX-7, and NTO, respectively, all of which are explosives...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-016-3111-0
更新日期:2016-10-01 00:00:00
abstract::In this study, the complete orthonormal sets of phi(alpha)-momentum space orbitals (where alpha = 1, 0, -1, -2, ...) obtained from the psi(alpha)-ETO in coordinate representation (I.I. Guseinov, J. Mol. Model., 9 (2003) 135) are reduced to the complete orthonormal sets of hyperspherical harmonics (HSH) by means of a F...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-005-0093-8
更新日期:2006-09-01 00:00:00
abstract::A coarse-grained Brownian dynamics model was used to simulate two proteins of similar sizes inside model membrane pores of varying size and hydrophobicity. The two proteins, which have radii of gyration of approximately 9.5 Å in their native states, are a 36-residue hydrophilic villin head piece (HP-36) and a 40-resid...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-019-3985-8
更新日期:2019-04-25 00:00:00
abstract::The theoretical three-dimensional structure of a novel δ-endotoxin Cry1Id (81 kDa) belonging to Cry1I class, toxic to many of the lepidopteran pests has been investigated through comparative modeling. Molecular dynamics (MD) simulations was carried out to characterize its structural and dynamical features at 10 ns in ...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-013-2010-x
更新日期:2013-12-01 00:00:00
abstract::The mechanism of the copper(I)-catalyzed cyclopropanation reaction for methyl diazoacetate with both (Z)- and (E)-but-2-ene stereoisomers has been studied using the 6-311++G(d,p) basis set by means of M06-2X and O3LYP functionals. According to both methods, the rate-limiting step is the formation of a copper-carbene i...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-018-3737-1
更新日期:2018-07-05 00:00:00
abstract::Hydrogenoxalate (charge -1) and oxalate (charge -2) anions and their solvated forms were studied by various computational techniques. Ab initio quantum chemical calculations in gas phase, in implicit solvent and microsolvated (up to 32 water molecules) environment were performed in order to explore a potential energy ...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-016-3075-0
更新日期:2016-09-01 00:00:00
abstract::Studies of the the three-dimensional quantitative structure-activity relationships for ninety-five c-kit tyrosine kinase inhibitors were performed. Based on a co-crystallized compound (1 T46), known inhibitors were aligned with c-kit by induced-fit docking, and multiple training/test set splitting was performed to val...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-011-1304-0
更新日期:2012-07-01 00:00:00
abstract::In the absence of interlogs, building docking models is a time intensive task, involving generation of a large pool of docking decoys followed by refinement and screening to identify near native docking solutions. This limits the researcher interested in building docking methods with the choice of benchmarking only a ...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-010-0758-9
更新日期:2011-03-01 00:00:00
abstract::Hydrogen dissociative chemisorption and desorption on small lowest energy Ni(n) clusters up to n=13 as a function of H coverage was studied using density functional theory. H adsorption on the clusters was found to be preferentially at edge sites followed by 3-fold hollow sites and on-top sites. The minimum energy pat...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-011-1059-7
更新日期:2011-09-01 00:00:00
abstract::The efficiency and high specificity of tobacco etch virus protease (TEVp) has made it widely used for cleavage of recombinant fusion proteins. However, TEVp suffers from a few intrinsic defects such as self-cleavage, poorly expressed in E. coli and less soluble. So some mutants were designed to improve it, such as S21...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-013-1930-9
更新日期:2013-11-01 00:00:00
abstract::In this work, the poly(ethylene oxide) bulk as one example has been iteratively heated and cooled back using MD simulations to examine the effects of thermal history on the resulting Tg. It is demonstrated that, after the system is equilibrated once at the high temperatures, the simulated Tg does not exhibit a systema...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-017-3439-0
更新日期:2017-08-22 00:00:00
abstract::We report a DFT, TDDFT and DFTB investigation of the performance of two donor-π-acceptor (D-π-A)-type organic dyes bearing different electron-withdrawing groups (EWG) for dye-sensitized solar cells (DSSCs) to evaluate which EWG is better for an acrylic acid acceptor, i.e., Cyano (-CN) or o-nitrophenyl (o-NO2-Ph). A se...
journal_title:Journal of molecular modeling
pub_type: 杂志文章
doi:10.1007/s00894-012-1719-2
更新日期:2013-04-01 00:00:00