On some aspects of gravitomagnetism in scalar-tensor theories of gravity

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Abstract

We discuss the gravitomagnetism in the context of scalar-tensor theories of gravity. We obtain the equation of motion of a particle in terms of gravitoelectric and gravitomagnetic fields. We discuss the gravitomagnetic time delay and the Lense-Thirring effect in the context of scalar-tensor theories of gravity. In the particular case of Brans-Dicke Theory, we compare the results obtained with those predicted by general relativity and show that within the accuracy of experiments designed to measure these effects, both theories predict essentially the same results.

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Most cited references 34

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In large structured RNAs, RNA hairpins in which the strands of the duplex stem are connected by a tetraloop of the consensus sequence 5'-GNRA (where N is any nucleotide, and R is either G or A) are unusually frequent. In group I introns there is a covariation in sequence between nucleotides in the third and fourth positions of the loop with specific distant base pairs in putative RNA duplex stems: GNAA loops correlate with successive 5'-C-C.G-C base pairs in stems, whereas GNGA loops correlate with 5'-C-U.G-A. This has led to the suggestion that GNRA tetraloops may be involved in specific long-range tertiary interactions, with each A in position 3 or 4 of the loop interacting with a C-G base pair in the duplex, and G in position 3 interacting with a U-A base pair. This idea is supported experimentally for the GAAA loop of the P5b extension of the group I intron of Tetrahymena thermophila and the L9 GUGA terminal loop of the td intron of bacteriophage T4 (ref. 4). NMR has revealed the overall structure of the tetraloop for 12-nucleotide hairpins with GCAA and GAAA loops and models have been proposed for the interaction of GNRA tetraloops with base pairs in the minor groove of A-form RNA. Here we describe the crystal structure of an intermolecular complex between a GAAA tetraloop and an RNA helix. The interactions we observe correlate with the specificity of GNRA tetraloops inferred from phylogenetic studies, suggesting that this complex is a legitimate model for intramolecular tertiary interactions mediated by GNRA tetraloops in large structured RNAs.

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Author and article information

Contributors

V. B. Bezerra: Role: ND

A. Barros: Role: ND

C. Romero: Role: ND

Journal

Journal ID (publisher): bjp

Title: Brazilian Journal of Physics

Abbreviated Title: Braz. J. Phys.

Publisher: Sociedade Brasileira de Física (São Paulo )

ISSN: 1678-4448

Publication date (Print): December 2005

Volume: 35

Issue: 4b

Pages: 1057-1061

Affiliations

[1 ] Universidade Federal da Paraíba Brazil

[2 ] Universidade Federal de Roraima Brazil

Article

Publisher ID: S0103-97332005000700011

DOI: 10.1590/S0103-97332005000700011

SO-VID: 53091696-1a10-4ddf-87e0-4957fc28a234

License:

http://creativecommons.org/licenses/by/4.0/

History

Product

SciELO Brazil

Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-9733&lng=en