Abstract: Xanthan gum is produced by fermentation with the bacterium, Xanthomonas campestris NRRL B-1459, of a nutrient medium containing a sugar and a stimulatory organic acid which stimulates the production of xanthan gum. The stimulatory organic acid can be a source of pyruvic acid, alpha-keto-glutaric acid, succinic acid or mixtures thereof.

Abstract: This disclosure describes an implantable microinfusion apparatus used to deliver an infusate systemically to an animal in accordance with a predetermined temporal program. The apparatus utilizes a pump to provide a hydrostatic force for the discharge of a plastic capillary tubing containing a linearly arrayed program of infusates. The tubing is charged with sequential discrete segments of fluid vehicle containing preselected concentrations of the product or products to be infused. The segments may be delimited by intervals of product-free immiscible fluid or the contents of the program tube may be stabilized by the inclusion of a gel in its fluid composition. The volume of the segments determines the infusion time of the various components of the program; the sequential position of the segments determines the order of their infusion, and the concentration of product in the segments determines the rate of their infusion.

Abstract: Electrochemical process and apparatus to control the chemical state of a material, that is, to cause said material to retain desired characteristics in an environment that normally would cause a change in those characteristics or to cause a material that has deteriorated from a desired chemical state to revert to the desired state.

Abstract: An improved metal dual insulator semiconductor capacitor memory is disclosed. The memory contains a plurality of capacitor cells, each cell comprising a semiconductor substrate layer and a high conductivity layer sandwiching two insulator layers. The substrate is doped to provide avalanche breakdown in a surface depletion layer at a voltage comparable to the write voltage in the accumulation direction. The invention also provides a method of reading stored information without disturbing adjacent cells. A small variable voltage is applied across a "flat-band" portion of the hysteresis loop describing the voltage-capacitance relationship for the capacitor memory. A change or the absence of a change in the current through the capacitor indicates the state of the capacitor cell. Methods to fabricate the memory are also disclosed.

Abstract: Aqueous heat-storage compositions useful in space heating applications are disclosed which contain a phase-change material which absorbs and stores heat as it is heated above its phase-change temperature and releases stored heat as it is cooled below its phase-change temperature. These compositions include fumed silicon dioxide which acts as a stabilizing agent and provides dramatically prolonged heat-storage efficiency for these compositions as they undergo repetitive cycling through their phase-change temperature. Articles containing such compositions and methods of forming such compositions are additionally disclosed.

Abstract: Oscillators that include charge-flow transistor logic elements, each logic element including a charge-flow transistor and a load element, in combination. The charge-flow transistors have TURN-ON times t.sub.on and TURN-OFF times t.sub.off that can be very different from one another (e.g., t.sub.on can range from milliseconds to hundreds of seconds; whereas in the charge-flow transistors shown herein t.sub.off is typically less than one microsecond). The magnitude of t.sub.on is sensitive to the environment; hence, the period of oscillation can be used as a measure of an environmental condition.

Abstract: A method of assessing performance potential of a quadruped by determining the timing of successive making and breaking of ground contact by the legs during the stride and the swing time of a leg of the quadruped while in a high-speed gait. Overlap time of the legs, that is, the time that more than one leg is on the ground at one time, as a function of the forward speed of the quadruped and the time required to complete the stride are derived. The total airborne time is determined and related to the stance, swing, and overlap of the stride time. Performance is assessed in terms of swing time, stance time, overlap time, airborne time and combinations thereof. A method is disclosed of relating measurements of the gait taken at an arbitrary speed to a standard reference speed for purposes of comparing different individuals.

Abstract: A variable speed electronic motor which may be powered by an ac or dc source and wherein both the speed of the motor and the input power thereto are controlled and related to one another.

Abstract: A process is described which combines polycrystalline isolation of collectors and shallow oxide isolation of bases. This approach is capable of providing deep dielectric isolation, surface planarity and the high density of walled emitter geometries, a combination heretofore unobtainable by any other means.This isolation scheme has been used to fabricate ECL gate chains. The transistors were located in 2.5 micron thick n epi islands surrounded by 5.times.10.sup.5 ohm-cm polysilicon selectively oxidized with silicon nitride masking to a thickness of one micron. The oxide "bump" at the nitride mask was typically 3000 A and the epi-poly step height was as small as 2600 A. The circuits have polysilicon resistors and were fabricated using both thermal diffusion and ion implantation. The power-delay product of these circuits was approximately one-half that of junction isolated circuits.

Abstract: Tantalum and niobium catalysts or catalyst precursors of the formula: ##STR1## wherein R is cyclopentadienyl, which can be substituted with methyl up to five positions, or neopentylidene, R.sup.1 is neopentyl or benzyl, n is 0 or 1, R.sup.2 is neopentylidene, benzylidene, tetramethylene, or 2,3-dimethyltetramethylene, A is halo or a moiety of the formula YR.sup.3 R.sup.4 R.sup.5 wherein Y is a group 5 element including N, P, As, Sb and Bi and R.sup.3, R.sup.4, R.sup.5 can be the same or different and are C.sub.1 -C.sub.4 alkyl, aralkyl such as naphthyl, neophyl, tolyl or xylyl, aryl such as benzyl or phenyl or bipyridyl and Z is tantalum or niobium. The compounds selectively dimerize 1-olefins to 1-butenes; m=1 or 2.

Abstract: A method of forming, by melt-spinning techniques, a laminated ribbon structure consisting, for example, of a semiconductor disposed on a metal ribbon substrate. The substrate may be 10-100 .mu.m thick and the semiconductor may be 10-100 .mu.m thick, for example; typically the ribbon width is about one millimeter to several centimeters.

Abstract: A process for implanting a precise quantity of radioactive metal on a metal substrate such as a cutting tool or other metal part subject to wear at the area or areas where the part is expected to wear during its operation. The presence of the radioactive spot can be sensed to determine the extent of wear during use. The radioactive metal is deposited from a wire formed of a core of the radioactive metal surrounded by a sheath of metal having a high thermal and electrical conductivity relative to the core. In operation, the wire contacts the metal surface under pressure and electric current is passed through the wire in order to (1) form a pit on the tool surface, (2) weld the radioactive metal in the pit and (3) evaporate a small portion of the conductive sheath adjacent the pit. A second current then is passed through the wire to break it near the bottom of the pit, leaving a small quantity of radioactive material welded to the bottom of the pit.

Abstract: Improvements in shallow-homojunction solar cells based upon a plurality of layers of a direct gap semiconductor material such as GaAs, as well as their fabrication, are disclosed. The shallow-homojunction solar cells have a n.sup.+ /p/p.sup.+ structure in which the n.sup.+ top layer is limited to a thickness which permits significant carrier generation to occur in a lower semiconductor layer. An anodic antireflection coating is applied over the n.sup.+ top layer, and a particularly preferred method for applying the antireflection coating is by anodization. These solar cells can be grown on relatively inexpensive substrates, if desired, such as silicon or germanium.

Abstract: An apparatus and method is provided for suppressing the dynamic response of structures such as offshore structures to forces, such as that of wind, wave or seismic excitation. A storage tank for liquid with a free surface is positioned on the structure and is designed to have a natural frequency equal to or nearly equal to the natural frequency of the structure. The storage tank containing the liquid reduces the dynamic response of the structure thereby reducing structural degradation such as metal fatique in the structure and increasing the useful life of the structure. The effect of the tank on the motion of the structure is that of a common dynamic absorber.

Abstract: An internally worn laryngeal prosthesis for laryngectomized patients is described. The prosthesis is worn internally at the end of a surgically constructed fistula leading to the base of the patient's vocal tract. Exhaled air powers a miniature vibratory mechanism whose output enters the vocal tract directly and supplies both a voiced and a voiceless sound source. A tube connects the other end of the prosthesis to the tracheostoma from which air from the lungs powers the prosthesis. The tube contains a valve which may be manually or automatically controlled to allow either speech or quiet breathing.

Abstract: The level of prolactin in blood serum is reduced by administering tyrosine to a human. The tyrosine can be administered alone, or concomitantly with a drug which tends to increase blood serum prolactin levels.

Abstract: Extractor for removal of a femoral component of a total or partial hip joint reconstruction, in which an impact shock is applied directly through hardware to the extractor which is so shaped that converging jaws secure the neck of a prosthesis therein and the withdrawal shock is applied parallel to the stem of the prosthesis.

Abstract: Lecithin without a drug is administered to a patient in order to increase acetylcholine levels in the brain or other tissues, thereby to alleviate the effects of tardive dykinesia, manic-depressive disease, memory impairment or familial ataxias.

Abstract: Isotopes are separated from an isotopically mixed molecular dopant dissolved in a cryogenic liquid. The solution is exposed to infrared laser light in order to selectively vibrationally excite a particular molecular species which contains the isotope or isotopes that are to be separated. The excited species then is reacted or dissociated to form recoverable reaction products rich in the isotope desired.

Abstract: An analog/digital simulator exhibiting a high degree of parity between the topology of the model and the topology of an electrical network being modeled. The simulator employs a plurality of synthetic electrical elements interconnected to simulate the electrical network; the synthetic electrical elements have terminals with which are associated physical voltages and physical currents that serve as a basis for network analysis.