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Bulk superconductivity with Tc (zero) up to 95 K in a Tl0.5Pb0.5Ca0.9Ce0.1Sr2Cu2 oxide with an Y1Ba2Cu3Oy-like structure (1989)

Wu, P. T. ; Liu, R. S. ; Liang, J. M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 54 (1989), S. 2464-2466

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Bulk superconductivity with Tc (zero) up to 95 K in a Tl0.5Pb0.5Ca0.9Ce0.1Sr2Cu2 oxide with an Y1Ba2Cu3Oy -like structure was observed. Single-phase samples, tetragonal in structure with a=0.380±0.001, c=1.195±0.001 nm, and of P4/mmm space group, were prepared. The results represent the first case where Ce substitution significantly raised the Tc of a known compound. The samples were remarkably homogeneous both in composition and structure. The compounds were highly reproducible and stable. The preparative conditions were found to be much less stringent than those of other copper-based high Tc superconductors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.101536

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Phosphorylation of yeast protein: Reduction of ribonucleic acid and isolation of yeast protein concentrate (1986)

Huang, Y.-T. ; Kinsella, J. E.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 28 (1986), S. 1690-1698

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Yeast nucleoproteins were chemically phosphorylated with phosphorus oxychloride (POCL3). Studies using 31P nuclear magnetic resonance (NMR) spectroscopy, stability to pH and lysine estimation all indicated that the ∊-amino group of lysine was the principal functional group phosphorylated. Phosphorylation of ca. 30% of the lysine residues resulted in removal of more than 85% of contaminant ribonucleic acid from protein precipitated at pH 4.2. Phosphorylation did not alter the amino acid composition of yeast proteins and was reversible under acidic conditions. Based on the data, a method for the preparation of phosphorylated yeast protein with low levels of nucleic acid is proposed.

Additional Material: 8 Ill.