Zobrazeno 1 - 10
of 170
pro vyhledávání: '"and Frank A. L. Anet"'
Publikováno v:
Origins of Life and Evolution of Biospheres. 36:39-63
The origin of the first RNA polymers is central to most current theories for the origin of life. Difficulties associated with the prebiotic formation of RNA have lead to the general consensus that a simpler polymer preceded RNA. However, polymers pro
Autor:
Frank A. L. Anet
Publikováno v:
Current Opinion in Chemical Biology. 8:654-659
Metabolism and replication are generally considered essential features of biological life. Workers in the field of the origin of life are mostly split into two groups, depending on which of these two functions is postulated to have occurred first. Be
Publikováno v:
Journal of Physical Organic Chemistry. 14:625-635
We report a reinvestigation of the conformational equilibrium of 1,3,5-cycloheptatriene-7-d (CHT-7-d) by solution 1H NMR at 500 MHz over a wide range of temperatures, and ab initio calculations up to the MP4 level. Lineshape analysis provided a barri
Publikováno v:
Concepts in Magnetic Resonance. 12:1-5
The nuclear Overhauser effect (NOE) in NMR spectroscopy is a useful tool for probing structural features of molecules. We present an experimental procedure for the facile preparation of a half-cage isodrin derivative of the type used in the original
Publikováno v:
Biochemistry. 35:15383-15390
We have studied the competition between Na+ and K+ for coordination by G quartets using the oligonucleotide d(G3T4G3) as a model system. d(G3T4G3) forms a dimeric foldback structure containing three G quartets in the presence of either NaCl or KCl. P
Autor:
Carolyn B. Knobler, M. Frederick Hawthorne, Mark D. Mortimer, David E. Harwell, and Frank A. L. Anet
Publikováno v:
Journal of the American Chemical Society. 118:2679-2685
The auracarboranes 1,2-(AuPPh3)2-1,2-C2B10H10 (1) and 1,1‘-(AuPPh3)2-[2-(1‘,2‘-C2B10H10)-1,2-C2B10H10] (2) have been synthesized. Both compounds were characterized by NMR and X-ray crystallography. Compound 2 was found to contain an aurophilic
Autor:
Frank A. L. Anet, Daron I. Freedberg
Publikováno v:
Chemical Physics Letters. 208:187-192
Weitekamp and co-workers have recently questioned the traditional method of averaging NMR parameters such as chemical shifts and coupling constants in the fast exchange limit because this method neglects spin energies. They have presented an alternat
Autor:
Frank A. L. Anet
Publikováno v:
ChemInform. 22
We have investigated the nature of two conformations recently discovered by others through extensive searches of the conformational space of cyclononane. Although these conformations are indeed energy minima with the MM2 force field, they have only m
Autor:
Jaemin Park, Frank A. L. Anet
Publikováno v:
Journal of the American Chemical Society. 114:411-416
Autor:
Daniel J. O'Leary, Frank A. L. Anet
Publikováno v:
Concepts in Magnetic Resonance. 4:35-52
The shielding tensor can be nonsymmetric and thus in general has both symmetric and antisymmetric parts. Relaxation by these two parts of the shielding tensor (chemical shift anisotropy or CSA relaxation) are reviewed and compared with relaxation by