Chi (x, 5'-GCTGGTGG) is a recombinator in RecAand RecBC-mediated recombination in Escherichia coli. In vegetative recombination between two bacteriophage lambda strains, one with and the other without Chi (a+x+bX u-Xob+), the X-containing recombinant (a-X+b-) is less abundant than the nonx-containing recombinant (a+xob+). Previously this was taken was evidence for nonreciprocality of X-stimulat...

f(x) = (sec 12x)(sec 12x+ tan 12x). A3 The limit is 0; we will show this by checking that dn = 0 for all n ≥ 3. Starting from the given matrix, add the third column to the first column; this does not change the determinant. However, thanks to the identity cosx+ cos y = 2 cos x+y 2 cos x−y 2 , the resulting matrix has the form  2 cos 2 cos 1 cos 2 · · · 2 cos(n+ 2) cos 1 cos(n+ 2) · · · 2 cos...

It is well known that sin(2β), where β is one of the angles of the unitarity triangle of the CKM matrix, can be determined in a theoretically clean way by measuring mixing-induced CP violation in the decay Bd → J/ψKS. Another clean extraction of this CKM angle is provided by the time-dependent angular distribution for the decay products of Bd → J/ψ(→ l +l−)K∗0(→ πKS), where we have more observa...

in order to evaluate nitrogen fixation ability and nutrients uptake in three cultivars of common bean (phaseolus vulgaris l.) inoculating with some types of inoculants containing different strains of rhizobium leguminosarum; bv. phaseoli an experimental design was conducted in khoramdarah region in 2006 and 2007. in this investigation three types of biological fertilizers including rb117, rb123...

A variety of extracellular signals lead to the phosphorylation and activation of mitogen-activated protein kinases (MAP kinases). An activator of MAP kinases, Mek1, phosphorylates MAP kinases at threonine and tyrosine residues and is itself phosphorylated at serine-218 and -222 by the protooncogene product Raf-1. By introducing negatively charged residues that may mimic the effect of phosphoryl...

Abstract A dipole magnet generating 20 T and beyond will require high-temperature superconductors such as Bi 2 Sr CaCu O 8 ? x REBa Cu 3 $_{7-x}$?> 7 (RE = rare eart...

MicroRNAs (miRNAs) constitute a growing class of non-coding RNAs that are thought to regulate gene expression by translational repression and mRNA degradation. We report here that short interfering RNA (siRNA) mutation significantly changed kinetics of the folding and unfolding of secondary structures and decreased Tm value of the duplex melting. The mutant duplex was more unstable thermodynami...