slug gene expression is associated with the specification and migration of neural crest cells in the African clawed frog Xenopus laevis. We provide evidence that the protein Ying-Yang 1 (YY1) regulates the slug gene expression both indirectly and directly, via a YY1 cis-element in the slug promoter, during Xenopus development. The ability of the YY1 to bind this YY1 cis-element was confirmed by...

BACKGROUND Treatment of intraoral malignant tumors often leads to continuity defects of the mandible. Whereas the use of free vascularised flaps has shortcomings regarding donor site morbidity and a worse-fitting bone geometry, the nonvascularized iliac crest graft could be an alternative option. The purpose of this study was to describe the treatment outcome with nonvascularized iliac crest gr...

Weirs are simple control structures usually built across channels for water storage and measurementof flow rates. The main target of the present study is to numerically simulate experimentally thehydraulic performance circular crested normal weirs. For numerical simulation, commercialpackage ANSYS CFX utilized adopting tetrahedrons mesh with a maximum total number 1932301elements, while, experi...

iris belongs toiridaceae family and it is monocotyledon. iris is one of the important ornamental and medicinal plants. 34 iris genotypes (14 species) collected from different provinces of iran were planted at national institute of ornamental plants (niop) iran. all of the species evaluated for 15 quantitative traits and 30 qualitative traits. results showed that the highest positive correlation...

Random walks and polygons are used to model polymers. In this paper we consider the extension of writhe, self-linking number and linking number to open chains. We then study the average writhe, self-linking and linking number of random walks and polygons over the space of configurations as a function of their length. We show that the mean squared linking number, the mean squared writhe and the ...

Let Λ be an n-dimensional integral lattice of determinant 1. We show that, for all sufficiently large n, the minimal nonzero squared length in Λ does not exceed [ (n + 6 )/10 ]. This bound is a consequence of some new conditions on the theta series of these lattices; these conditions also enable us to find the greatest possible minimal squared length in all dimensions n ≤ 33. In particular we s...