The surface termination of a Fe (III) spin crossover molecular salt.

From a comparison of the known molecular stoichiometry and x-ray photoemission spectroscopy, it is evident that the Fe(III) spin crossover salt [Fe(qsal)Ni(dmit)] has a preferential surface termination with the Ni(dmit)moiety, where qsal = N(8quinolyl)salicylaldimine, and dmit= 1,3-dithiol-2-thione-4,5-dithiolato. This preferential surface termination leads to a significant surface to bulk core level shift for the Ni 2p x-ray photoemission core level, not seen in the corresponding Fe 2p core level spectra. A similar surface to bulk core level shift is seen in Pd 3d in the related [Fe(qsal)]Pd(dmit).

Chiral effects at the metal center in Fe(III) spin crossover coordination salts.

Evidence of chirality was observed at the Fe metal center in Fe(III) spin crossover coordination salts [Fe(qsal)][Ni(dmit)] and [Fe(qsal)](TCNQ)from x-ray absorption (XAS) spectroscopy at the Fe 2pcore threshold. Based on the circularly polarized XAS data, the x-ray natural circular dichroism for [Fe(qsal)][Ni(dmit)] and [Fe(qsal)](TCNQ)is far stronger than seen for [Fe(qsal)]Cl suggesting this natural circular dichroism signature is a ligand effect rather than a result of just a loss of octahedral symmetry on the Fe core. The larger the chiral effects in the Fe 2p core to bound XAS, the greater the perturbation of the Fe 2pto 2pspin-orbit splitting seen in the XAS spectra.

Evidence of Cooperative Effects for the Fe(phen)(NCS) Spin Crossover Molecular Complex in Polyaniline Plus Iron Magnetite.

The spin crossover complex Fe(phen)(NCS) and its composite, Fe(phen)(NCS), combined with the conducting polymer polyaniline (PANI) plus varying concentrations of iron magnetite (FeO) nanoparticles were studied. A cooperative effect is evident from the hysteresis width in the plot of magnetic susceptibility multiplied by temperature versus temperature (χmT versus T) for Fe(phen)(NCS) with PANI plus varying concentrations of FeO nanoparticles. The hysteresis width in the composites vary no more than 2 K with respect to the pristine Fe(phen)(NCS) spin crossover crystallites despite the fact that there exists a high degree of miscibility of the Fe(phen)(NCS) spin crossover complex with the PANI.

Elliptical excision with midline primary closure versus rhomboid excision with limberg flap reconstruction in sacrococcygeal pilonidal disease: a prospective, randomized study.

To compare elliptical excision with primary midline closure and rhomboid excision with limberg flap reconstruction techniques for the sacrococcygeal pilonidal sinus. This prospective randomized study of 80 patients of sacrococcygeal pilonidal sinus was performed in SKIMS medical college from 2004 to 2007. After assigning patients randomly to either of the surgical groups, group A patients (40/80) were operated by using rhomboid excision with limberg flap reconstruction whereas group B patients (40/80) were operated by using elliptical excision with primary midline closure.

An unusual case of inguinal hernia with spontaneous evisceration.

Spontaneous evisceration is a very rare and potentially fatal complication of abdominal wall hernia. It has been commonly reported in the case of umbilical hernia in patients with chronic liver disease with tense ascites. With other hernias, such as incisional hernia and inguinal hernia, the complication has been reported only once.