Bilateral femoral neck fractures as a complication of myelography

This paper discusses two cases of bilateral subcapital fracture of the proximal femur as a complication of myelography with Conray 60. The literature is reviewed.     

The application of 1H HR-MAS NMR spectroscopy for the study of structures and associations of organic components at the solid-aqueous interface of a whole soil

High resolution-magic angle spinning nuclear magnetic resonance (HR-MAS NMR) allows the application of solution-state NMR experiments to samples that are not fully soluble and contain solids. Only the species in contact with the solvent system employed become NMR observable. In this study utilizing D2O as the solvent system we show it is possible to examine the structures at the solid-aqueous interface of a whole soil. Combining one- and two-dimensional HR-MAS NMR allowed, for the first time, the identification of fatty acids, aliphatic esters, and ethers/ alcohols as prominent species at the solid-aqueous interface of the soil with signals from sugars and amino acids also apparent. Few, if any signals from aromatic protons were observed when the soil was swollen in aqueous media, although these signals are observed in extracts from the same soil and when the soil is swollen with a more penetrating solvent(DMSO-d6)which is known to disassociate hydrogen bonds. These findings indicate that the soil aromatic moieties are protected in hydrophobic regions which are not water accessible. Furthermore, when the soil was amended with a herbicide (trifluralin), direct observations of interactions between the protons on a xenobiotic and the surrounding soil matrix were possible for the first time. HR-MAS promises to be a method that can be widely applicable to a range of complex environmental samples without the need for extraction, pretreatment, or purification.     

The Electrically Small Elliptical Loop with an Oblate Spheroidal Core

The fundamental properties of an electrically small elliptical loop wound on an oblate spheroidal core are calculated using quasi-static theory. Closed-form expressions are derived for the elements of a complete equivalent circuit, including the inductance and capacitance, and radiation, conductor, and core-loss resistances. It is shown that the bandwidth and efficiency are greatly increased by the use of a ferrite core. Losses in the core are computed for two low-loss ferrites. Although the primary objective is to simplify the design of a transmitting antenna for use in the lower part of the HF band, 2-4 MHz, the theory presented is equally valid for the design of receiving antennas and for other frequencies.