The mechanism of nucleohistone degradation in calf thymus chromatin during autolysis of the latter involves a release of lysine-rich histone fractions, followed by degradation of the thus-exposed DNA portions; the latter portions are richest in adenine-thymine sequences. After this degradation process, residual nucleohistone fragments of low molecular weight (105) remain. Their chemical composi...

Nucleotide composition, codon usage and amino acid content are important molecular signatures that vary in different groups of organisms. AT-rich (or GC poor) hyperthermophiles have relatively been unexplored in these aspects. In this study, we have examined the compositional characteristics of AT rich genomes viz. Methanococcus jannaschii, Sulfolobus solfataricus, Sulfolobus tokodaii and Nanoa...

Th-rich (up to 18.4 wt.% ThO2) loparite occurs as an accessory phase in foyaite pegmatites at Mr. Eveslogchorr, Khibina complex, Russia. It is associated with aegirine, astrophyllite, eudialyte, lorenzenite, lamprophyllite, magnesio-arfvedsonite and gerasimovskite. Loparite crystals are zoned from niobian loparite (core) to niobian thorian and thorian niobian loparite (rim). Th-enrichment is ac...

We discover that Au-rich Cu1-xAux and Pt-rich Ni1-xPtx contain a composition range in which there is a quasicontinuum of stable, ordered "adaptive structures" made of (001) repeat units of simple structural motifs. This is found by searching approximately 3x10(6) different fcc configurations whose energies are parametrized via a "cluster expansion" of first-principles-calculated total energies ...

The specific electric conductivity of molten HgI2-HgBr2 and Hgl2-Sbl3 binary mixtures was measured as a function of composition and temperature in the ranges 220 — 540 °C and 180 to 540 °C, respectively. In the HgI2-HgBr2 system negative deviations from additivity are found in mixtures rich in HgBr2, and positive ones in those rich in Hgl2 . The positive deviations are more pronounced at higher...

We present high resolution Spitzer spectroscopy of several point-ings in the outflow of the Red Rectangle. Besides the resonances due to the C-rich PAHs, the spectra show a wealth of new emission bands, in particular in the 13–19.5 µm range. We argue that these bands are due to solid state components, and show that simple oxides of a varying composition show a good match to the data. The presen...

Co 75 Fe 25 (at. %) alloy films of 100 nm thickness are prepared on MgO(001) and (110) single-crystal substrates. A (001) bcc film is epitaxially grown the substrate, whereas a (211) bi-crystalline formed MgO(110) substrate. The out-of-plane in-plane lattice spacings in agreement with bulk values within small differences less than 1%. orientation dispersions smaller 2°. These results show that ...