Abstract: The invention provides pheS polypeptides and DNA (RNA) encoding pheS polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing pheS polypeptides to screen for antibacterial compounds.

Abstract: The invention provides lysS polypeptides and DNA (RNA) encoding lysS polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing lysS polypeptides to screen for antibacterial compounds.

Abstract: The invention provides aspS polypeptides and DNA (RNA) encoding aspS polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing aspS polypeptides to screen for antibacterial compounds.

Abstract: The invention provides hisS polypeptides and DNA (RNA) encoding hisS polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing hisS polypeptides to screen for antibacterial compounds.

Abstract: The invention provides valS polypeptides and DNA (RNA) encoding valS polypeptides and methods for producing such polypeptides by recombinant techniques. Also provided are methods for utilizing valS polypeptides to screen for antibacterial compounds.

Abstract: Disclosed is a space launch system having a main engine which uses turbopumps to provide fuel and oxidizer to the main engine combustion chamber, and one or more booster engines that use high pressure fuel and/or oxidizer to pressurize the fuel and oxidizer tanks of the booster engine to obtain the pressure differential necessary to drive fuel and oxidizer from the fuel and oxidizer tanks of the booster engine to the combustion chamber of the booster engine.

Abstract: A calibration method and apparatus for economical and rapid calibration of a scientific instrument utilizing a monochromator to generate monochromatic light utilizing controllable means for determining the angular position of a light dispersing element in the monochromator and a filter having a narrow absorption band(s) to determine a relationship between the wavelength of the monochromatic light generated by the monochromator and an angular position of the dispersing element so that the dispersing element can be rotated to an exact position for the monochromator to generate a selected wavelength of monochromatic light.

Abstract: A roller structure for a rotary machine has a plate that is removably engagable with the outer casing of such rotary machines, a shaft portion attached to the plate and insertable through the outer casing, a bearing mounted for rotation upon the shaft portion, and a selected plurality of shims having different thicknesses engagable upon the shaft portion to adjust the position of the bearing with respect to an inner casing of the rotary machine.

Abstract: A thin film catalyst structure is described for use in hydrodesulphurization of gaseous hydrocarbon mixtures. The catalyst is formed starting with an aluminum substrate having an oxide surface layer and thin films of metallic cobalt and molybdenum are sequentially deposited on the aluminum oxide layer. The films of metallic cobalt and molybdenum are calcined and then reduced and sulphided to form a sulphided thin film catalyst structure having improved hydrodesulphurization properties.

Abstract: A microreactor is described which is especially designed to analyze small solid samples, such as thin film catalyst. It includes (a) a horizontal tubular reaction vessel for receiving an article for testing, one end of the vessel being closed and the other end being connected to a ball valve end flange, (b) a horizontal shelf within the reaction vessel adapted to receive and support the article for testing, (c) gas inlet means for introducing gas into the vessel, (d) gas outlet means for removing gas from the vessel, (e) sensing means for sensing the temperature within the reaction vessel, (f) means disposed outwardly of the vessel and in heat-conductive relation to the outer surface thereof for heating the vessel, and (g) releaseable gripper means for delivering the article for testing through the ball valve and into the reaction vessel and for releasing the article onto the shelf.

Abstract: The present invention comprises a method and means for stabilizing the frequency difference between the component frequency modes in the beam of a gas laser influenced by Zeeman splitting. Stabilizing the frequency difference makes constant the frequency of the beat signal obtained from heterodyning the component modes. Stabilization is obtained by accurately controlling the difference in frequency between the component frequency modes to provide a selected separation, preferably 250 KHz, with deviation maintained at less than two KHz. The difference in frequencies is controlled independently of the individual frequency or intensity of either of the component frequency modes, or of their relative position within the "Doppler broadened" spectral profile characteristic of the lasing material.

Abstract: Fuel for a rocket engine consisting of hydrogen, oxygen and a hydrocarbon is admitted into the combustion zone through an injector whereby the hydrogen and hydrocarbon components are either pre-mixed in the injector or independently delivered and the oxygen is always independently delivered into the combustion zone.

Abstract: The invention combines liquid hydrogen with liquid oxygen and a hydrocarbon as the fuels in a tripropellant rocket booster engine.

Abstract: A biological indicator is made of a vial which contains a "spore dot", a nutrient solution in a frangible ampoule, and means for positioning the spore dot and for breaking the ampoule to release the nutrient solution when the cap of the vial is fully pressed on. The nutrient solution typically contains a pH indicator to determine whether all active spores on the strip were killed by a sterilization process which takes place prior to breaking the ampoule.

Abstract: An arming trigger unit having a retractable member for selectively retaining or releasing an arming wire of a store which retractable member is, after having been released, retained in its release position by a safety member. Further, such safety member engages a ring portion of the arming wire such that ejection of the ring portion is assisted when the arming wire is released. Such safety member is movable out of the position at which it retains the retractable member to permit a subsequent arming wire to be retained by the retractable member. A method of maintaining an actuating member for a store in a selected position to release an unarmed store by moving a safety member into a position whereat said actuating member is retained in such selected position. Further, the method of installing a store with respect to an aircraft by releasing a safety member to permit an actuating member to captively retain an arming wire.

Abstract: Apparatus for establishing a "home" position for a load element driven axially along the lead screw. A position sensor includes a first sensor element attached for axial travel with the load element and a second sensor element attached for rotation with the lead screw. The pair of sensor elements is operatively aligned at a predetermined relative axial and rotational position establishing the "home" position.

Abstract: A steel plug is inserted into a modern shotgun to convert it into a muzzleloading firearm. The plug is made for use as a breech plug in a single barrel shotgun without modifications to gun. The plug enables the shotgun to be used as a muzzle-loader with black powder and allows conversion of the gun back to its original condition by simply removing the breech plug.

Abstract: A photomultiplier detector protection system and method utilizing a negative feedback loop to maintain the photomultiplier detector output below a predetermined output. The feedback loop comprises a comparator responsive to the photomultiplier detector output and also responsive to a predetermined limit signal. The comparator output is applied to a summing amplifier which also receives a voltage adjust signal. The output of the summing amplifier controls the output of a power supply which is in turn applied to the photomultiplier detector.

Abstract: In a spectrophotometer including a photomultiplier tube and an operational amplifier responsive to the current from the photomultiplier tube for generating a DC voltage proportional to light intensity, a method and means for simultaneously compensating for the dark current of the photomultiplier tube and the offset of the operational amplifier so that the output voltage of the operational amplifier is zero volts under dark conditions.

Abstract: A method and means for operating log converter circuits in which the method comprises the steps of sequentially conducting to the input of the log converter circuit signals representing a known transmittance (T) of 100% T, 10% T, 1% T, and 0.1% T, these signals covering the range of operation of the log converter circuit, storing the outputs of the circuit as signals representing an absorbance (A) of 0A, 1A, 2A, and 3A, respectively, conducting to the input of the log converter circuit an unknown signal, and utilizing a microcomputer to perform a linear interpolation of the output of the circuit with the unknown signal applied thereto using the previously stored 0A, 1A, 2A, and 3A signals.