James R Akse

58829377, Mar 16, 1999

Jul 9, 1997

8/903279

Richard L. Sauer - League City TX
James R. Akse - Roseburg OR
John O. Thompson - Roseburg OR
James E. Atwater - Eugene OR

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

G01N 3300
G01N 2700

436113

Ammonia monitor and method of use are disclosed. A continuous, real-time determination of the concentration of ammonia in an aqueous process stream is possible over a wide dynamic range of concentrations. No reagents are required because pH is controlled by an in-line solid-phase base. Ammonia is selectively transported across a membrane from the process stream to an analytical stream under pH control. The specific electrical conductance of the analytical stream is measured and used to determine the concentration of ammonia.

57926212, Aug 11, 1998

Jun 28, 1995

8/496230

Charles E. Verostko - Houston TX
James E. Atwater - Eugene OR
James R. Akse - Roseburg OR
Jeffrey L. DeHart - Myrtle Creek OR
Richard R. Wheeler - Myrtle Creek OR

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

C12Q 154
C12Q 128
C12Q 126
G01N 2176

435 14

A "reagentless" chemiluminescent biosensor and method for the determination of hydrogen peroxide, ethanol and D-glucose in water. An aqueous stream is basified by passing it through a solid phase base bed. Luminol is then dissolved in the basified effluent at a controlled rate. Oxidation of the luminol is catalyzed by the target chemical to produce emitted light. The intensity of the emitted light is detected as a measure of the target chemical concentration in the aqueous stream. The emitted light can be transmitted by a fiber optic bundle to a remote location from the aqueous stream for a remote reading of the target chemical concentration.

59104481, Jun 8, 1999

Apr 4, 1997

8/826645

James E. Atwater - Eugene OR
James R. Akse - Roseburg OR
Jeffrey DeHart - Yoncalla OR

Umpqua Research Company - Myrtle Creek OR

G01N 3318

436133

The process of this invention comprises providing a membrane for separating CO. sub. 2 into a first CO. sub. 2 sample phase and a second CO. sub. 2 analyte phase. CO. sub. 2 is then transported through the membrane thereby separating the CO. sub. 2 with the membrane into a first CO. sub. 2 sample phase and a second CO. sub. 2 analyte liquid phase including an ionized, conductive, dissociated CO. sub. 2 species. Next, the concentration of the ionized, conductive, dissociated CO. sub. 2 species in the second CO. sub. 2 analyte liquid phase is chemically amplified using a water-soluble chemical reagent which reversibly reacts with undissociated CO. sub. 2 to produce conductivity changes therein corresponding to fluctuations in the partial pressure of CO. sub. 2 in the first CO. sub. 2 sample phase.

56437994, Jul 1, 1997

Oct 31, 1994

8/332570

James E. Atwater - Eugene OR
James R. Akse - Roseburg OR
Jeffrey DeHart - Yoncalla OR

Umpqua Research Company - Myrtle Creek OR

G07N 3318

436133

The process of this invention comprises providing a membrane for separating CO. sub. 2 into a first CO. sub. 2 sample phase and a second CO. sub. 2 analyte phase. CO. sub. 2 is then transported through the membrane thereby separating the CO. sub. 2 with the membrane into a first CO. sub. 2 sample phase and a second CO. sub. 2 analyte liquid phase including an ionized, conductive, dissociated CO. sub. 2 species. Next, the concentration of the ionized, conductive, dissociated CO. sub. 2 species in the second CO. sub. 2 analyte liquid phase is chemically amplified using a water-soluble chemical reagent which reversibly reacts with undissociated CO. sub. 2 to produce conductivity changes therein corresponding to fluctuations in the partial pressure of CO. sub. 2 in the first CO. sub. 2 sample phase.