New experimental evidence for Podkletnov effect

Podkletnov effect [Physica C (1992)] consists in a decrease in weight (up to 2 wt. %) of arbitrary samples placed over a massive YBa2Cu3O6+d (YBCO) disk, which is in the superconducting state and under the influence of an alternating magnetic field. It has been pointed out that the partial weight loss may be a result of energy state existing in the superconducting disk at low temperatures. There are known unsuccessful attempts to reproduce the effect in other laboratories. It has been noted that the most problem was the manufacturing of a needed massive superconducting disk with a two-layer specific structure. Our paper presents experimental results that we believe may be related to the sought effect - similar inexplicable changes in weight have been obtained for YBCO samples after they had been exposed to an alternating magnetic field. The results, however, have been obtained in a different experimental realization. Changes in weight are observed for the YBCO material itself, which is in a non-superconducting state at room temperature but exhibits slight diamagnetic properties. Instead of the complexly formed disc, our material represents partially hydrated powder. In our case, values of the inexplicable weight changes, which are well reproducible from sample to sample, are about 0.01 wt. %.Comment: 10 pages, 5 figure

Frequency-dependent reflection of spin waves from a magnetic inhomogeneity induced by a surface DC-current

The reflectivity of a highly localized magnetic inhomogeneity is experimentally studied. The inhomogeneity is created by a dc-current carrying wire placed on the surface of a ferrite film. The reflection of propagating dipole-dominated spin-wave pulses is found to be strongly dependent on the spin-wave frequency if the current locally increases the magnetic field. In the opposite case the frequency dependence is negligible.Comment: 3 pages, 3 figure

Diversity of Trypsin Inhibitors in Cultural and Wild Barley

Diversity of trypsin inhibitors was studied in 35 spring barley cultivars (Hordeum vulgare), 21 samples of H. spontaneum, and 3 samples of H. agriocrithon. Six variants of trypsin inhibitor spectra were identified by native electrophoresis method followed by specific development of activity. Four variants were found in both cultivated and wild barley, and the other two were revealed only in H. spontaneum. Trypsin inhibitor activities (TIA) and soluble protein contents were determined in four cultivars with different variants of trypsin inhibitors. It was shown that TIA differed in the cultivars studied and did not correlate with soluble protein contents