Abstract: A semiconductor optoelectronic device provides full duplex data communication over a single optical fiber. The semiconductor device comprises a unitary P-N light emitting portion and an N-I-P photodiode portion. The light emitting portion and the photodiode portion share a common electrode for connection to operating voltage sources. The second electrode of the light emitting portion contains a window that is associated with one end of the optical fiber. A source of operating voltage for the light emitting portion is connected to the common electrode, and through data controlled switch means and a first resistance means to the second electrode of the light emitting portion. A source of operating voltage for the photodiode portion is connected to the common electrode, and through a second resistance means to a second electrode of the light emitting portion. Differential amplifier means is connected to receive the voltage developed across the first and second resistance means.

Abstract: The present invention relates to an optical switch which will generate and emit a beam of light when an optical signal is directed therein, but includes means to inhibit the generation of the beam of light when a second optical signal is directed therein. The switch includes a light emitter formed of a plurality of layers of alternating opposite conductivity type which is adapted to generate the beam of light when an optical signal is directed therein. A photovoltaic inhibitor is connected to the emitter so that any current generated by the inhibitor is applied across the emitter in a manner to prevent the generation of the light in the emitter. The photovoltaic inhibitor generates the current when a second optical signal is directed therein. Depending on the external circuit, the device can be operated in either a digital (bistable) or analog mode.

Abstract: In a fiber optic communication system, an acoustooptic modulator operates to provide a coherent light beam that is data encoded in the beam's time domain, for example by intensity modulation of the beam. A spatial light modulator then operates to address encode the beam by modulating the beam in the space domain. The resulting data and address modulated beam possesses the property of orthogonality. This beam is now transmitted to the input of a multimode optical fiber. The speckle pattern that exits the output of the optical fiber also exhibits orthogonality. This output beam is presented to a beam splitter in order to produce two spatially modulated speckle light patterns therefrom. These two beams are then focused onto photorefractive means whereat a hologram is produced. This hologram operates to address decode the beam output of the optical fiber. Detector means now operates to detect the data by receiving the beam as it is diffracted by the hologram. Ring and star interconnect networks are described.

Abstract: Discretely and continuously tunable filers emplying FLC cells are provided. Exemplary discretely tunable filters employ bistable smectic C* FLC cells. Exemplary continuously tunable filters employ smectic A* FLC cells. Single or multiple stage filters are provided. Blocking filters useful for color generation are also provided. The FLC filters provided can be temporally multiplexed.

Abstract: Magnetically stabilized fluidized bed technology is utilized in conjunction with ion-exchange adsorption/desorption processes in a method and system for isolating proteins from cell lysate. The invention also includes a magnetizable, porous, ion-exchange particle, and a method for producing the same, for use with the stationary magnetically stabilized fluidized bed protein isolation process.

Abstract: Vasodilators and theophylline.

Abstract: A series array architecture using multiple photonic stages perform universal permutation of time-slots on a time-multiplexed photonic signal using far fewer switches than the currently known architectures. The array architectures include Serial switch arrays with feed-forward delay, Serial switch arrays with feedback delay using shift-base of 2, and Serial switch arrays with feedback delay using shift-base of 3. The array has multiple stages where each can be described as the temporal equivalent of spatial interconnection networks.

Abstract: Magnetizable, porous particles are prepared by contacting a first portion of porous particles with a suspension comprised of magnetite particles, coated with a dispersing agent, and water, removing and discarding the first portion of porous particles, contacting the suspension with a second portion of porous particles, and separating the second portion of porous particles from the suspension. The magnetizable, second portion of porous particles may be ion exchange resin particles used in a magnetically stabilized fluidized bed to isolate proteins from cell lysate.

Abstract: Stable mixed metal oxide compositions containing nitrogen are formed by treating an oxygen-deficient perovskite composition with nitrogen dioxide. Preferably, the oxygen-deficient perovskite is of the formula X.sub.a Z.sub.b Cu.sub.c O.sub.h wherein X is a member selected from the group consisting of yttrium, scandium, lanthanum, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, bismuth and thallium, Z is a member selected from the group consisting of barium, strontium, calcium, magnesium and mixtures thereof, a is not less than 1, b is from 0 to 3, c is from 0 to 3, and h is not greater than about 6, and the mixed metal oxides are of the formula X.sub.a Z.sub.b Cu.sub.c N.sub.j O.sub.k where X, Z, a, b and c are as previously defined, j is from about 0.001 to about 3, and k is from about 6 to about 13.

Abstract: Magnetically stabilized fluidized bed technology is utilized in conjunction with ion-exchange adsorption/desorption processes in a method and system for isolating proteins from cell lysate. The invention also includes a magnetizable, porous, ion-exchange particle, and a method for producing the same, for use with the stationary magnetically stabilized fluidized bed protein isolation process.

Abstract: A procedure for the immunoassay of a proteolytic procoagulant enzyme in biological samples is described. The presence of the enzyme is indicative of malignant disease, and the immunoassay is used as a diagnostic test for cancer.

Abstract: Chiral, nonracemic compounds of the general formula: ##STR1## wherein n=1 or 2, Y is a hydrogen, fluorine, chlorine or bromine atom, R' is an alkyl or alkoxy group having three to fifteen carbons, and R is an alkyl group having three to fifteen carbons, which are useful as ferroelectric liquid crystal components having high polarization are described. Also described are compounds of the same general formula in which X is OH, which are useful as synthetic intermediates in the preparation of the FLC components of the present invention.