BACTEC 13A medium (Johnston Laboratories, Towson, Md.) was compared with Isolator (Du Pont Co., Wilmington, Del.) concentrate for sensitivity, speed, and technical ease of isolation of mycobacteria from paired patient blood samples. Of 72 positive cultures, 63 were positive by both systems. Five positive cultures were detected by BACTEC 13A medium alone, and four were detected by Isolator alone...

A compact magnetless isolator for optical communication systems based on a ring resonator with an outer layer made of silicon and inner magneto-optical material that does not require external magnet to keep its magnetization saturated is suggested. Three-dimensional computational simulations the device performed full-wave electromagnetic solver COMSOL Multiphysics show insertion loss isolation ...

Optical isolators are indispensable components of almost any optical system and used to protect a laser from unwanted reflections for phase-stable coherent operation. The emergence chip-scale systems, powered by semiconductor lasers that integrated on the same chip, has generated demand fully isolator. Conventional approaches, which rely use magneto-optic materials break Lorentz reciprocity, pr...

We report an efficient wavelength conversion via four-wave-mixing in reverse biased silicon-on-isolator p-i-n rib waveguides and demonstrate, for the first time, the conversion of a high-speed optical pseudo-random bit sequence data at 40 Gb/s. Results give a wavelength conversion efficiency of -8.6dB using a 8cm long waveguide with clear open eye on the wavelength converted signal . Conversion...

Treatment under conditions of gnotobiotic isolation can augment the stress of adaptation to a diagnosis of leukaemia. Identification of the psychological problems experienced in isolator treatment can contribute to the effective maintenance of therapy. Individual patterns of adjustment to treatment relate to the psychological defence mechanisms employed to contend with the dependent position en...

A guided wave optical isolator using a four layered leaky yttrium iron garnet (YIG) waveguide with a YIG guiding layer is proposed and analyzed through a transfer matrix formulation. The dependence of isolation characteristics on different waveguide parameters are discussed. It is shown that for four layered structures an isolation ratio of about 24 dB can be achieved with YIG films having larg...

We have characteri~ed a number of recently developed fiber optic components that hold the promise of unprecedented stability for pas~ively etabilired fkequency distribution l i s . These components include a fiber optic transmitter, an optical isolator and a new type of flber optic cable. A novel laser transmitter exhibits wtremely low sendtivity to intensity and polarixation changes of rdected...