Effect of surface polishing and oxidization induced strain on electronic order at the Verwey transition in Fe3O4.

Following the controversy between two previous publications (Lorenzo et al 2008 Phys. Rev. Lett. 101 226401 and Garcia et al 2009 Phys. Rev. Lett. 102 176405), we report on the influence of mechanical polishing, and subsequent sample storage, on the electronic order at the Verwey transition of highly pure magnetite, Fe(3)O(4), by resonant x-ray scattering. Contrary to expectations, mechanically polishing the surface induces an inhomogeneous micron deep dead layer, probably of powdered Fe(3)O(4). In addition, we have found that polishing the sample immediately before the experiment influences and favors the appearance of long range order electronic correlations, whereas samples polished well in advance have their electronic order quenched. Conversely, lattice distortions associated with the Verwey transition appear less affected by the surface state. We conclude that mechanical polishing induces stresses at the surface that may propagate into the core of the single crystal sample. These strains relax with time, which affects the different order parameters, as measured by x-ray resonant diffraction.

Subcutaneous T-cell lymphoma: report of two cases.

We have seen two patients, a 24-year-old man and a 15-year-old girl, with subcutaneous nodules and fever. The histopathological findings in both cases showed a lobular, histiocytic panniculitis with 'bean bag' cells and lymphoid cells identified as immature T-cells. This picture was consistent with subcutaneous T-cell lymphoma associated with cytophagic histiocytic panniculitis. The girl died after 5 months of disease with florid hemophagocytic syndrome; the man was subjected to a course of treatment (CHOP; cyclophosphamide/doxorubicin/vincristine/prednisone) and after 6 months observation his symptoms of nodules and fever disappeared.

[Werner's Syndrome]. / Zespól wernera.

A typical case of Werner's syndrome was described. All characteristic features were present i.e.: atrophy of muscle and subcutaneous tissue, especially in distal parts of limbs, reduced and gray hairs, numerous atrophic ulcers and hyperkeratotic lesions in points under the pressure (elbow, feet), diffused osteoporosis in all bones, the most intensive in hands and feet, activity dental caries, bilateral cataract, high pitched, horse voice, caused by atrophy of voice cords, endocrinologic disturbances especially concerning testosterone, follicle stimulating hormone, and prolactin, hypoplasia of external genitals, the abnormal blood glucose curve. Far reaching resemblance of the Werner's syndrome to the physiological senility was emphasized. Good reaction to anabolic drugs was described.