Results 121 to 130 of about 149 (149)

Conformational studies on (+)-anatoxin-a and derivatives

Journal of Computer-Aided Molecular Design, 1992
Anatoxin-a (AnTX) is a highly potent agonist acting at the nicotinic acetylcholine receptor (nAChR) and represents a valuable tool in the study of this receptor. Molecular mechanics, semi-empirical and ab initio molecular orbital energy minimization procedures were conducted to investigate the conformation of AnTX.
Philip E. Thompson, Frank E. Blaney, David T. Manallack, Timothy Gallagher   +3 more
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Conformational analysis of dipeptide‐derived polyisocyanides

Journal of Polymer Science Part A: Polymer Chemistry, 2003
AbstractThe conformational properties of polymers derived from isocyanodipeptides have been investigated with a combination of model calculations, X‐ray diffraction, and circular dichroism spectroscopy. Depending on the configuration of the side chains, defined arrays of hydrogen bonds along the polymeric backbone are formed.
Nico A. J. M. Sommerdijk, Roeland J. M. Nolte, Roeland J. M. Nolte, Jeroen J. L. M. Cornelissen, Alan E. Rowan, W. Sander Graswinckel   +5 more
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Conformation of acyclic derivatives of sugars

Carbohydrate Research, 1969
Abstract The peracetylated diethyl dithioacetals of d -ribose, d -arabinose, d -xylose, d -lyxose, l -rhamnose, and l -fucose were studied in chloroform- d solution by n.m.r. spectroscopy at 100 MHz. Signals of all protons were assigned, assignments were verified by spin-decoupling, and first-order coupling-constants were determined.
Joseph D. Wander, Derek Horton
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Conformational Interconversions of Amino Acid Derivatives

Journal of Chemical Theory and Computation, 2016
Exhaustive conformational interconversions including transition structure analyses of N-acetyl-l-glycine-N-methylamide as well as its alanine, serine, and cysteine analogues have been investigated at the MP2/6-31G** level, yielding a total of 142 transition states.
Kaminský, Jakub, Jensen, Frank
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On a Representation of the Derivative of a Conformal Mapping [PDF]

Georgian Mathematical Journal, 2001
Let ! conformally map the unit circle on a plane singly-connec- ted domain D bounded by a simple rectifiable curve. It is shown that for the function lg! 0 to be represented in the unit circle by a Cauchy type A-integral with density arg! 0 , it is necessary and sucient that D be a Smirnov domain.
V. Paatashvili, G. Khuskivadze
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Conformational and electronic effects in dehydroaminoacid derivatives

Journal of Molecular Structure, 1986
Abstract The electronic structure of the cyclic dipeptide of dehydrophenylalanine has been investigated by vapour-phase He(I) and He(II) UV photoelectron spectroscopy. Assignments are proposed by comparison with related molecules and supported by INDO/S calculations.
D. AJO, V. BUSETTI, CASARIN, MAURIZIO, H. C. J. OTTENHEIJM, R. PLATE, A. VITTADINI   +5 more
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The mixed conformable partial derivatives

Periodica Mathematica Hungarica, 2020
In this paper we introduce a new conformable derivative call it mixed conformable partial derivative, which obeys classical properties, including linearity, product rule, quotient rule and vanishing derivatives for constant functions. As an application, we establish an Opial type inequality for the mixed second order conformable partial derivatives.
Chang-Jian Zhao, Wing-Sum Cheung
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Conformational Analysis of Moreliene Derivatives [PDF]

Journal of Natural Products, 1994
The conformation of a series of 4,8,8-trimethyl-9-methyleneperhydro-1,5-methanonaphthalene (moreliene) derivatives [1-6] was determined from 1 H-nmr coupling constants in combination with molecular modeling calculations. While the conformation of ring A remains essentially the same within the series, the conformation of ring B is sensitive to ...
Luisa U. Román, R. E. Del Rio, Pedro Joseph-Nathan, Carlos M. Cerda-García-Rojas, Juan D. Hernández   +4 more
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Comparative Conformations of Uridine and Pseudouridine and Their Derivatives [PDF]

European Journal of Biochemistry, 1980
Stimulated by the suggestion that pseudouridine psi-39 in yeast tRNAPhe could be in a syn conformation [R. E. Hurd and B. R. Reid (1977) Nucleic Acid Research 4, 2747-2755], we have made a comparative study of the solution conformations of psi and U derivatives, using the proton-proton Overhauser effect.
S. Tran-Dinh, Jean-Marie Bernassau, J. M. Neumann, Maurice Guéron   +3 more
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Conformation of polythiophene derivatives in solution

Synthetic Metals, 1998
The behaviour of regioregular polypropyl-3-thiophene and polyhexadecyl-3-thiophene in poor and good solution conditions was simulated by molecular dynamics. The single chains and clusters consisting of two molecules in full atomic representation were considered.
Schaumburg, Kjeld, Bjørnholm, Thomas, Shibaev, P.V., Nørgaard, K.   +3 more
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