Results 21 to 30 of about 1,596,183 (162)

Thermodynamic functions with other properties and vibrational spectra of pyrimidine ring of uracil for RNA and bio-molecule 5-aminouracil

open access: yesHeliyon, 2019
Vibrational spectra (Infra Red and Raman) of uracil and 5-aminouracil have been recorded as well as reproduced in solid phase for the pyrimidinal region (200-2000 cm−1) and the internal modes were analyzed especially for pyrimidine ring of bio-molecules ...
J.S. Singh
doaj   +1 more source

ONIOM studies of interaction between single-walled carbon nanotube and gallates derivatives as anticancer agents [PDF]

open access: yesNanomedicine Journal, 2017
Objective(s): The novel 7-hydroxycoumarinyl gallates derivatives are detected in many pharmaceutical compounds like anticancer and antimicrobial agents.
Nosrat Madadi Mahani
doaj   +1 more source

Development of A Multi-core CPU Cluster System : for Gaussian 03 Calculation Environment [PDF]

open access: yes, 2006
In order to obtain the well-turned quantum calculation environment for a chemical researcher, we developed the construction procedure of Linux cluster system for Gaussian 03 with Linda Parallel without bothersome labor.
西海, 豊彦   +3 more
core  

DFT Study of 7-R-3methylquinoxalin-2(1H)-ones (R=H; CH3; Cl) as Corrosion Inhibitors in Hydrochloric Acid

open access: yesInternational Journal of Electrochemical Science, 2012
A theoretical study based on DFT methods at B3LYP/6-31G** level of theory, was carried out, by means of the GAUSSIAN 03 set of programs, on three recently reported quinoxaline derivatives as corrosion inhibitors in acidic media.
Z. El Adnani   +7 more
doaj   +1 more source

Quantum-mechanical calculation of the structural and energetic characteristics of the fluorinealcanes

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2023
Within the «quantum theory of atoms in molecules» the charge q and volume V of topological atoms A and atomic groups R of fluorinated molecules of ethanes C2HmFk, where 0 ≤ m, k ≤ 6 and m+k = 6 and propanes C3HmFk, where 0 ≤ m, k ≤ 8, m+k = 8, has been
A.V. Kotomkin, Yu.D. Orlov
doaj   +1 more source

Rigid and Relaxed Potential Energy Surface Scans (PES Scan) in Gaussian 03 and Gaussian 09

open access: yes, 2010
Another common question on CCL… The use of Internal Redundant coordinates (through the Opt=ModRedundant option) must not be overlooked! This option performes a geometry optimization at each step while maintaining the scanned variable constant, which is referred to as a Relaxed Potential Energy Surface (PES) Scan.
openaire   +1 more source

The Role of Hyperconjugation on the Structure and C–H Stretching Frequencies of 3,3′-Ethane-1,2-diyl- bis-1,3,5-triazabicyclo[3.2.1]octane (ETABOC): An X-Ray Structure and Vibrational Study

open access: yesCrystals, 2018
Structural and vibrational studies have been carried out for the most stable conformer of 3,3′-ethane-1,2-diyl-bis-1,3,5-triazabicyclo[3.2.1]octane (ETABOC) at the DFT/B3LYP/6-31G(dp) level using the Gaussian 03 software.
Augusto Rivera   +3 more
doaj   +1 more source

Constraints on Primordial Non‐Gaussianity from the High‐Redshift Cluster MS 1054−03

open access: yesThe Astrophysical Journal, 2000
The implications of the massive, X-ray selected cluster of galaxies MS1054--03 at $z=0.83$ are discussed in light of the hypothesis that the primordial density fluctuations may be nongaussian. We generalize the Press-Schechter (PS) formalism to the nongaussian case, and calculate the likelihood that a cluster as massive as MS1054 would appear in the ...
openaire   +2 more sources

Polydiphenylenephthalide: Optical Spectroscopy and DFT Calculations

open access: yesMedžiagotyra, 2011
The results of spectral and luminescent studies of polydiphenylenphthalide (PDF) solutions and thin films as well as molecule structure and its energy levels DFT modelling within the Gaussian-03 software package are presented. It is shown that structural
Alexander KUKHTA   +2 more
doaj   +1 more source

Theoretical Study of Vibrational Frequencies and Chemical Shifts of Choline Halides (F, Cl, Br)

open access: yesSüleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, 2010
The vibrational frequencies and 1H and 13C chemical shifts of choline halides have been calculated using density functional theory (B3LYP) method with 6-311++G(d, p) and 6-31 G(d, p) basis set level in Gaussian 03 and Parallel Quantum Solutions (PQS) ab ...
Mustafa Karakaya   +3 more
doaj  

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