Das Aequivalentgewicht des Yttriums

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Glasslike elastic properties in the ω-β alloys

We have measured the internal friction and speed of sound in several polycrystalline alloys, using compound torsional oscillators at frequencies between 60 kHz and 100 kHz and temperatures between 50 mK and 100 K. By combining these data with existing elastic and thermal data on similar alloys, we find that those alloys which can undergo diffusionsless phase transitions, such as Ti:Nb, Ti:V, or Zr:Nb in certain ranges of composition have glasslike excitations, since they have elastic properties which agree in magnitude and temperature dependence with those of amorphous solids. By contrast. crystalline continuous solution alloys, such as Nb:Ta, or alloys with diffusive phase transitions, such as high-pressure quenched Al₉₄Si₆, have the same elastic properties as are known for crystals.     

Genetic polymorphism of apolipoprotein H (beta 2-glycoprotein I) in African blacks from the Ivory Coast.

The apolipoprotein H (APO H) polymorphism was analyzed in the Negroid population from the Ivory Coast using polyacrylamide gel isoelectric focusing, followed by immunoblotting. The gene frequencies of alleles APO H*1, APO H*2, APO H*3 and APO H*4 were calculated to be 0.012, 0.921, 0.047, and 0.020, respectively. The assumption that APO H*4 represents a Negroid marker allele is supported by this population study.     

Identification of group specific component/vitamin D-binding protein (GC/DBP) mutants by isoelectric focusing in immobilized pH gradients

The six common genetic types of the group specific component/vitamin D-binding protein (GC/DBP) system are usually classified by isoelectric focusing in carrier ampholytes, followed by visualization of the GC proteins by immunoprinting with monospecific antiserum. In addition, more than 120 mutant GC types have been discovered. For their identification additional methods were necessary, including polyacrylamide gel electrophoresis, isoelectric focusing in the presence of 3 M urea as well as isoelectric focusing in immobilized pH gradients. The application of the last method is described in detail and several examples of GC/DBP mutants identified thereby are presented.     

Efficient Quantum Algorithms for Simulating Sparse Hamiltonians

We present an efficient quantum algorithm for simulating the evolution of a quantum state for a sparse Hamiltonian H over a given time t in terms of a procedure for computing the matrix entries of H. In particular, when H acts on n qubits, has at most a constant number of nonzero entries in each row/column, and ||H|| is bounded by a constant, we may select any positive integer k such that the simulation requires O((log^* n)t ^1+1/2k ) accesses to matrix entries of H. We also show that the temporal scaling cannot be significantly improved beyond this, because sublinear time scaling is not possible.     

Die Aequivalentgewichte des Yttriums und des Erbiums

Ohne Zusammenfassung     

Das Aequivalentgewicht des Thoriums

Ohne Zusammenfassung     

Heats of protonation of amines,diazacrown ethers and cryptands in methanol

The heats of protonation of different amines, diazacrown ethers and cryptands in methanol have been measured using calorimetric titrations. The values of the reaction enthalpies decrease in going from primary over secondary to tertiary amines. The results for the protonation of diazacrown ethers and cryptands are not comparable with those obtained for the alkyl amines. Additional interactions between the proton and the oxygen donor atoms influence the values of the reaction enthalpy for the first protonation. The results for the second protonation reaction indicate that this proton is located outside the cavities of the macrocyclic and macrobicyclic ligands. This revised version was published online in July 2006 with corrections to the Cover Date.