51 research outputs found
Rarita-Schwinger Type Operators on Spheres and Real Projective Space
In this paper we deal with Rarita-Schwinger type operators on spheres and
real projective space. First we define the spherical Rarita-Schwinger type
operators and construct their fundamental solutions. Then we establish that the
projection operators appearing in the spherical Rarita-Schwinger type operators
and the spherical Rarita-Schwinger type equations are conformally invariant
under the Cayley transformation. Further, we obtain some basic integral
formulas related to the spherical Rarita-Schwinger type operators. Second, we
define the Rarita-Schwinger type operators on the real projective space and
construct their kernels and Cauchy integral formulas.Comment: 21 pages. arXiv admin note: text overlap with arXiv:1106.358
An AT-barrier mechanically controls DNA reannealing under tension
Regulation of genomic activity occurs through the manipulation of DNA by competent mechanoenzymes. Force-clamp optical tweezers that allow the structural dynamics of the DNA molecule to be measured were used here to investigate the kinetics of mechanically-driven strand reannealing. When the force on the torsionally unconstrained lambda-phage DNA is decreased stepwise from above to below the overstretching transition, reannealing occurs via discrete shortening steps separated by exponentially distributed time intervals. Kinetic analysis reveals a transition barrier 0.58 nm along the reaction coordinate and an average reannealing-step size of approximately 750 bp, consistent with the average bp interval separating segments of more than 10 consecutive AT bases. In an AT-rich DNA construct, in which the distance between segments of more than 10 consecutive AT is reduced to approximately 210 bps, the reannealing step reduces accordingly without changes in the position of the transition barrier. Thus, the transition barrier for reannealing is determined by the presence of segments of more than 10 consecutive AT bps independent of changes in sequence composition, while the length of the reannealing strand changes according to the distance between poly-AT segments at least 10 bps long
Group III and IV muscle afferents: Role on central motor drive and clinical implications
International audienceno abstrac
External vs. internal interactions in the enantiodiscrimination of fluorinated alpha-amino acid derivatives by heptakis[(2,3-di-O-acetyl-6-O-(tert-butyldimethylsilyl)]-beta-cyclodextrin, a powerful chiral solvating agent for NMR spectroscopy
NMR spectroscopic investigations involving extensive use of ROESY and DOSY techniques and comparison with silylated-acetylated linear dextrins as acyclic model compounds
shed light on the origin of the phenomenon of enantiodiscrimination of fluorinated α-amino acid derivatives by heptakis[2,3-di-O-acetyl-6-O-(tert-butyldimethylsilyl)]-β-
cyclodextrin. The effectiveness and versatility of the cyclic derivatized oligosaccharide as a chiral solvating agent for the
NMR determination of enantiomeric purity in the same class of compounds is demonstrated. A regular correlation between the relative positions of enantiomers’ signals and absolute configurations is observed
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