The production of structured and repetitive sounds by striking objects is a behavior found not only in humans, but also in a variety of animal species, including chimpanzees (Pan troglodytes). In this study we examined individual and social factors that may influence the frequency with which individuals engage in drumming behavior when producing long distance pant hoot vocalizations, and analyz...

By binding to adjacent subsites in its 21 base-pair operator, Arc represses transcription from two divergent promoters, Pant and Pmnt, in the immunity I operon of bacteriophage P22. Arc dimers bind to each subsite with nanomolar affinities and interact through protein-protein interactions to stabilize binding further. Here, we show that an Arc dimer bound to a single subsite reduces the rate of...

We analyze the 3-paramter family of exact, regular, static, spherically symmetric perfect fluid solutions of Einstein’s equations (corresponding to a 2-parameter family of equations of state) due to Pant and Sah and ”rediscovered” by Rosquist and by the present author. Except for the Buchdahl solutions which are contained as a limiting case, the fluids have finite radius and are physically real...

Bacterial cell-cell communication or quorum sensing (QS) is a biological process commonly described as allowing bacteria belonging to a same pherotype to coordinate gene expression to cell density. In Gram-positive bacteria, cell-cell communication mainly relies on cytoplasmic sensors regulated by secreted and re-imported signaling peptides. The Bacillus quorum sensors Rap, NprR, and PlcR were ...

one of the important issues in the middle east country is trying to establish or revive nuclear program over the past few years. this subject can have peaceful or military dimension & components of power and security can be affected. the regional country insisted on its being non-nuclear by 2006. but from this time, gradually altered the traditional approach of these countries on the nuclear is...

iran-france relations have gone through many ups and downs in the last three decades. yet, during the last few years and especially during the presidency of sarkozy, an unforeseen coldness dominated the relations between the two countries. it seems that recent events in the area and iran’s nuclear power profile accompanied by changes taken place especially in france’s approach to iran. this pap...