Films of isotopic mixtures of helium have been studied using x-ray specular reflectivity techniques. In contrast with superfluid He films, x-ray exposure causes a reduction in the thickness of He films above the superfluid transition as well as films of pure He and He/He mixtures. One proposed model that could account for this effect is a charging model, in which thinning is caused by electrost...

Flowers and Farley (Reports, 21 December 2012, p. 1616; published online 29 November 2012) use thermochronometry to propose that the western paleo–Grand Canyon was nearly as deep 70 million years ago (Ma) as today. However, lithologies, facies relations, geomorphology, and paleotopography of Miocene interior-basin deposits near the mouth of the Grand Canyon show that no paleocanyon existed in t...

Cytogenetic analyses using C-banding and chromosomal digestion by several restriction enzymes were carried out in four populations (named A, B, C and D) of Hypostomus prope unae (Loricariidae, Hypostominae) from Contas river basin, northeastern Brazil. These populations share 2n=76 and single NORs on the second metacentric pair but exclusive karyotype forms for each locality. Populations A and ...

An experiment was performed to test the hypothesis that the outcome of a vocal nonverbal attempt at persuasion can be affected by the participants' skills in nonverbal communication. Subjects' vocal sending or vocal decoding abilities were pretested. Senders and decoders were agents and recipients, respectively, of social influence in a field experiment in which social influence took the form o...

the study of the sentence and its divisions has been always a cause of difference in syntactical viewpoints among the ancient and modern arab grammarians. ibn hesham sees three divisions for the arabic sentence: the noun sentence, the verb sentence and the adverb sentence. the adverb sentence in his view is that in which a time or place adverb or a prepositional phrase is the predicate proceede...