Conformational states of methylamides of N-acetyl α-amino acids and their N-methyl derivatives III. Dipole moments

1973 ◽  
Vol 9 (3) ◽  
pp. 328-333
Author(s):  
E. S. Efremov ◽  
P. V. Kostetskii ◽  
V. T. Ivanov ◽  
E. M. Popov ◽  
Yu. A. Ovchinnikov
Keyword(s):  
Amino Acids ◽  
Dipole Moments ◽  
Conformational States ◽  
Methyl Derivatives

Conformational states of methylamides of N-acetyl α-amino acids and their N-methyl derivatives IV. Association in solutions

1973 ◽  
Vol 9 (3) ◽  
pp. 334-340
Author(s):  
E. S. Efremov ◽  
P. V. Kostetskii ◽  
V. T. Ivanov ◽  
E. M. Popov ◽  
Yu. A. Ovchinnikov
Keyword(s):  
Amino Acids ◽  
Conformational States ◽  
Methyl Derivatives

Conformational states of methylamides of N-acetyl α-amino acids and their N-methyl derivatives II.1H NMR spectra

1973 ◽  
Vol 9 (3) ◽  
pp. 320-327
Author(s):  
V. T. Ivanov ◽  
P. V. Kostetskii ◽  
T. A. Balashova ◽  
S. L. Portnova ◽  
E. S. Efremov ◽  
...  
Keyword(s):  
Amino Acids ◽  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
Conformational States ◽  
Methyl Derivatives

Conformational states of methylamides of N-acetyl α-amino acids and their N-methyl derivatives I. Infrared spectra

1973 ◽  
Vol 9 (3) ◽  
pp. 308-319 ◽  
Author(s):  
E. S. Efremov ◽  
L. B. Senyavina ◽  
V. N. Zheltova ◽  
A. G. Ivanova ◽  
P. V. Kostetskii ◽  
...  
Keyword(s):  
Amino Acids ◽  
Infrared Spectra ◽  
Conformational States ◽  
Methyl Derivatives

Conformation of ring A in 3-oxotriterpenoids. Dipole moments and CD spectra

1986 ◽  
Vol 51 (3) ◽  
pp. 611-620 ◽  
Author(s):  
Jiří Klinot ◽  
Václav Všetečka ◽  
Eva Klinotová ◽  
Alois Vystrčil
Keyword(s):  
Dipole Moments ◽  
Cd Spectra ◽  
Boat Form ◽  
Methyl Derivatives

The A ring of 3-oxotriterpenoids allobetulone (I) and 3-xo-lupane-28-nitrile (IV) exists by about 40% in the boat form as derived from comparison of their dipole moments with those of 2α-methyl derivatives II, V (chair models) and 2β-methyl compounds III, VI (boat models). The same result was obtained from the CD spectra of 3-oxotriterpenoids I-VIII and from isomerization of the 2α- and 2β-substituted ketones XI and XII, respectively.

scholarly journals HPLC determination of acidic d-amino acids and theirN-methyl derivatives in biological tissues

2009 ◽  
Vol 23 (6) ◽  
pp. 581-587 ◽  
Author(s):  
Mara Tsesarskaia ◽  
Erika Galindo ◽  
Gyula Szókán ◽  
George Fisher
Keyword(s):  
Amino Acids ◽  
Biological Tissues ◽  
Hplc Determination ◽  
Methyl Derivatives

scholarly journals Calculation and Analysis of Fractal Descriptors for Protein Amino Acids in Various Conformational States

2018 ◽  
Vol 1 (3) ◽  
pp. e00070
Author(s):  
V.Yu. Grigorev ◽  
L.D. Grigoreva
Keyword(s):  
Amino Acids ◽  
Conformational Transition ◽  
Van Der Waals ◽  
Conformational State ◽  
Conformational States ◽  
Protein Amino Acids ◽  
Α Helix ◽  
Β Sheet ◽  
Fractal Descriptor

A series of 20 proteinogenic amino acids was studied. Four types of fractal descriptors for 2 conformational states are calculated: α-helix and 1-strand β-sheet. Based on the analysis of the results obtained, it is established that when the conformational state of the amino acids (α-helix→β-sheet) changes, significant changes in the fractal descriptor Dtot, in the calculation of which all the atoms of the molecule are used, are not observed. However, the more specific descriptors Dval, Dvdw and Dunb, which reflect the aggregate of valence-coupled, van der Waals contact and unbound atoms, respectively, are more sensitive to the conformational transition. The increase Dval, Dvdw and the decrease Dunb values were established for a series of 7 amino acids.

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