The intra-aortic antibacterial therapy of wounded patients with gunshot meningoencephalitis

The original decision of permanent introduction of antibacterial means to tissues of brain at gunshot meningoencephalitis is offered. For antibacterial therapy the intra-aortal catheter with diameter of 2,5 mm (through a.femoralis) was introduced. After washing the catheter by solution of crystalloid with heparin the various combinations of preparations in 5% solution of glucose were introduced: cephalosporin--8 g/day; hentamicin and brumacilin--240 mg/day accordingly, amicacin--1500 mg/day. Speed of introduction--20-50 mg/h, total volume--500 ml. The catheter was in aorta not more than 10 days, maximum--14 days. A described technique was applied in Burdenko Main Military Clinical Hospital on 34 wounded in head. At computer tomography of brain of all wounded intracranially the splinters and bullets were revealed, clinically--meningoencephalitis. Foreign bodies have been extracted after cupping of clinical and laboratory signs of meningoencephalitis. The authors consider, that the technique is effective not only at wounds of brain, but also at suppurative meningoencephalitis of other etiology.     

The use of trypsin and lysozyme immobilized on a cellulose carrier in treating otitis externa

In December 1991, an outbreak of Streptococcus bovis septicaemia occurred in a Belgian pigeon loft where 25 male and 25 female racing pigeons were housed. The main clinical signs included inability to fly and poor breeding results. None of the female pigeons and only one male pigeon was able to fly. Nine affected pigeons were necropsied. Histologically a tenosynovitis of the tendon of the deep pectoral muscle was observed in most of them and S bovis was isolated from the canalis triosseus or the shoulder joints of five of the nine pigeons. The pigeons were successfully treated with ampicillin administered in the drinking water for seven days.     

Fracture toughness of as-cast freight bogie solebars after volume–surface quenching

The fracture toughness of freight bogie solebars made of low-carbon 20GFL steel is studied in the normalized state and after volume–surface quenching (VSQ). The fracture strength is estimated using acoustic emission and the critical J integral. VSQ is shown to increase J _c of the solebar material by a factor of ≈1.5, and its static strength is higher than that after normalization by ≈1.7 times.     

Catalytic activity of new nickel(II) formazanates in ethylene oligomerization

Thirteen mono- and three bisformazans containing one system of azahydrazone bonds have been synthesized, as well as mono- and binuclear complexes on their basis. The kinetic features of ethylene oligomerization in the presence of catalytic systems on the basis of AlEtCl₂-activated Ni(II) formazanates differing in composition and structure have been studied. The structures of the mono- and binuclear complexes differ by substituents in the formazan ligand, which have an effect on the activity of the systems and the product composition. The catalytic activity of the binuclear complexes is several times below that of mononuclear Ni(II) formazanates.     

Peculiarities of measurements in scanning electrical-conductivity microscopy

Functional capabilities of the scanning electrical-conductivity microscopy (SECM) in determining the electrical conductivity of nano-sized elements, studying the nanostructure of conductive coating materials, and evaluating the conductivity of nano-objects are described. The applicability of the SECM to finding imperfections in the multilevel metallization of integrated circuits with a nano-sized topology is demonstrated.     

The measurement problem of detecting gravitational waves from binary pulsars

A new method for processing the output signal from a gravitational wave direction finder in the measurement problem of detecting and identifying gravitational waves from binary relativistic astrophysical objects is discussed and studied.     

Effect of corrosion damages on the mechanical properties of zirconium alloy cladding tubes

The accumulation kinetics of corrosion-induced damages in zirconium alloy cladding tubes is studied during stress corrosion cracking tests. The effect of corrosion damages on the mechanical properties of the tubes in loading by internal pressure is analyzed.     

Motion of a Robot Mower with Directional Control

Russian Engineering Research - The stability of robot-mower motion in a specific direction is considered. The direction is regulated by means of an angular sensor and a programmable controller...     

Ion funnel trap interface for orthogonal time-of-flight mass spectrometry

A combined electrodynamic ion funnel and ion trap coupled to an orthogonal acceleration (oa)-time-of-flight mass spectrometer was developed and characterized. The ion trap was incorporated through the use of added terminal electrodynamic ion funnel electrodes enabling control over the axial dc gradient in the trap section. The ion trap operates efficiently at a pressure of approximately 1 Torr, and measurements indicate a maximum charge capacity of approximately 3 x 10(7) charges. An order of magnitude increase in sensitivity was observed in the analysis of low concentration peptides mixtures with orthogonal acceleration (oa)-time-of-flight mass spectrometry (oa-TOF MS) in the trapping mode as compared to the continuous regime. A signal increase in the trapping mode was accompanied by reduction in the chemical background, due to more efficient desolvation of, for example, solvent related clusters. Controlling the ion trap ejection time was found to result in efficient removal of singly charged species and improving signal-to-noise ratio (S/N) for the multiply charged analytes.