摘要:
The invention relates to a neutral nonionic latex comprising:(a) about 5 to about 70 weight percent of a nonionic polymer comprising polymerized free-radically polymerizable nonionic monomer, based upon the total weight of the neutral nonionic latex, wherein the free radically polymerizable nonionic monomer comprises:(i) about 90 to about 99 percent by weight of nonionic alkyl acrylate monomer; and(ii) about 1 to about 10 percent by weight of nonionic amide monomer; wherein the weight percentages of (i) and (ii) are based upon the total weight of (i) plus (ii);(b) about 30 to about 95 weight percent of an aqueous phase, based upon the total weight of the neutral nonionic latex; and(c) about 2 to about 10 weight percent of a nonionic emulsifier based upon the total weight of the nonionic polymer plus the nonionic emulsifier;wherein particles of the nonionic polymer are stabilized by the nonionic emulsifier and dispersed within the aqueous phase. The invention also relates to the neutral nonionic adhesive prepared from the latex and to adhesive coated sheet materials.
摘要:
A culture media device comprised of a body member including self-supporting substrate, and coated on its upper surface with a layer of water-based adhesive composition and a layer of a cold-water-soluble powder, is provided. The culture media device can also include an optional cover sheet, covering at least a portion of the body member, and an air-permeable membrane affixed to the upper surface of the substrate to allow for the growth of aerobic microorganisms. In addition, processes of making and using the culture media device are disclosed.
摘要:
A device for culturing microorganisms is described comprising a body member comprising a self-supporting, water-proof substrate; a layer of adhesive coated on the substrate, the adhesive being non-inhibitory to the growth of microorganisms; and a cold-water-soluble powder adhered uniformly to the surface of the adhesive, the powder comprising a gelling agent and/or nutrients for growing microorganisms. Another device is described comprising a body member comprising a self-supporting, water-proof substrate; a coating coated directly on the substrate, the coating being substantially water-free and consisting essentially of a cold-water-reconstitutable material comprising a gelling agent and/or nutrients for growing microorganisms; and a cover sheet releasably adhered to the bottom member, the cover sheet being substantially impermeable to bacteria and water vapor. The devices are activated by the addition of water or an aqueous test sample.
摘要:
This invention relates to a device for growing bacteria from an initial population to a final predetermined population, said device including a medium for such growth and a means for obtaining a predetermined population for inoculation of said medium.
摘要:
A method of applying a gas shielded tungsten arc welding process in a deep, narrow groove joint wherein the shield gas is directed to the weld puddle through an elongated gas nozzle 14 which surrounds a substantial length of the welding electrode and is sized to extend into the groove. The improvement including incrementally increasing the width (20) of the nozzle to correspond to increases in the width of the groove at preselected increases in the width of the groove as the nozzle is withdrawn from the groove during successive weld passes. The preselected elevations and nozzle widths are chosen so that the desired gas shield area does not substantially exceed 1.25 times the nozzle width.
摘要:
A non-liner electron-optic polymer based, integrated optic, electron-optic device utilizing a non-liner electron-optic polymer for the optical wave guide core layer sandwich between two very thin optically transparent electrically conductive charge sheet poling electrode layers which are, in turn, sandwiched between two electrically passive polymer optical wave guide cladding layers.
摘要:
An improved automated acousto-optic analyzer system includes an acousto-optic tunable filter which is coupled with a source of radiation to produce pulsed light at predetermined wavelengths. This light is transmitted through a gas stack containing gases to be analyzed, to a distant detector. The configuration of the acousto-optic tunable filter, radiation source on one side of an environment of interest and a detector on the opposite side of an environment of interest produces spatial separation of the tuned, diffracted light from the undiffracted broad spectrum of the light source at the detector. This configuration eliminates the need for polarizers in the system. It also combines the tuning function of the AOTF with a chopping function, allowing extraneous radiation to be discriminated against. Thus the improved configuration of the disclosed invention permits effective operation of the gas analysis system in a gas stack characterized by extremely high ambient temperatures.
摘要:
An improved combustion control system for a jackshaft controlled boiler or the like utilizes a second power actuator, a linkage biasing mechanism and a function generator which provides a position control signal as a function of the boiler load in order to position the linkage biasing mechanism to obtain an automatically calibrated, near optimum relationship between fuel and air. An alternative embodiment of this invention includes a flue gas analysis system where the position control signal is modified to further enhance combustion efficiency. This invention also includes a method for programming a programmable combustion control system according to this invention.
摘要:
A device for growing bacteria from a predetermined initial population to a predetermined final population comprising a means for obtaining the predetermined initial population and a medium to obtain growth of the bacteria to the predetermined final population.
摘要:
A wand assembly having an elongate rod with a lower end having a groove or grooves formed therein. When contacted with (e.g., touched to) a colony, the lower end is able to ingest a predetermined quantity of bacteria into the groove or grooves by capillary action. The wand assembly is particularly suitable for ingesting very small quantities of bacteria, e.g., on the order of 1.times.10.sup.7 colony forming units, since it is provided with a collar that is releasably attached to the rod, and can be detached from the rod after the lower end has been touched to a colony, in a manner that wipes excess, unwanted bacteria from the peripheral surface of the rod.