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This invention is an Optical Radiation Frequency Converter employing metal vapor which is useful in the ultraviolet region of the spectrum. The invention comprises a cell for retaining the metal vapor or gas which is surrounded by an oven. Monochromatic radiation passes through windows in the cell and oven. In the preferred embodiment, the metal vapor for accomplishing third harmonics is one which has its fundamental harmonic frequencies resonance in the spectral region between the fundamental frequencies and the third harmonic. The metal vapor must have a suitable refractive index to provide for phase matching.

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The invention illustrates and describes a method and apparatus for eliminating the noise and debris of explosive welding techniques. This is accomplished by placing the explosive in a complete enclosure so that both the sound and debris of the explosion are contained in the enclosure. The welding is accomplished by the explosive pressure applied through the wall of the enclosure to the pieces to be joined.

The novelty of the invention is in eliminating the safety hazards and detrimental psychological effects of the loud noises and scattering of debris which result from use of unconfined explosive welding while maintaining the inherent simplicity of the technique.

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BACTERIAL ADENOSINE TRIPHOSPHATE AS A
MEASURE OF URINARY TRACT INFECTION

NASA Case No. GSC-11092-2

Great Britain, France, Canada,
West Germany, Japan

Address inquiries to:

Goddard Space Flight Center

Attn: Patent Counsel

Mail Code: 204

Greenbelt, MD 20771
U.S.A.

[Corresponding U.S. Patent-Application Pending]

A method is provided for determining bacterial levels in urine samples, which method depends on the quantitative determination of bacterial adenosine triphosphate (ATP) in the presence of non-bacterial adenosine triphosphate. After the removal of nonbacterial ATP, the bacterial ATP is released by cell rupture and is measured by an enzymatic bioluminescent assay using an enzyme obtained from the firefly.

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A method of coating pigment particles is described for preventing degradation and discoloration by ultraviolet light. The chemical species utilized serve as recombination sites for the electrons and holes produced by the radiation. The chemical species selected for a particular pigment should be one equivalent such that stable oxidation stages are formed differing by one electronic charge. Zinc oxide pigments coated with ferri- and ferrocyanide are discussed as an example.

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A stored charge device of the general type designated as an MNOS field-effect transistor, has its operation improved by embedding a thin metal layer between two insulating films used in the transistor. The embedded metal layer technique is also used to provide a two-terminal thin-film stored charge device, consisting of a "metalinsulator-embedded metal-insulator-metal", sandwich sandwich structure which can be used in high-density memory arrays.

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