Dr. John A. Adams Profile

Dr. John A. Adams

at JMAR Technologies Inc

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Proceedings Article | 15 April 2008 Paper

A true real-time, on-line security system for waterborne pathogen surveillance

John Adams, David McCarty

Proceedings Volume 6945, 69451K (2008) https://doi.org/10.1117/12.777080

KEYWORDS: Contamination, Pathogens, Microorganisms, Light scattering, Particles, Water, Surveillance, Telecommunications, Bacteria, Homeland security

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Over the past several years many advances have been made to monitor potable water systems for toxic threats. However, the need for real-time, on-line systems to detect the malicious introduction of deadly pathogens still exists. Municipal water distribution systems, government facilities and buildings, and high profile public events remain vulnerable to terrorist-related biological contamination. After years of research and development, an instrument using multi-angle light scattering (MALS) technology has been introduced to achieve on-line, real-time detection and classification of a waterborne pathogen event. The MALS system utilizes a continuous slip stream of water passing through a flow cell in the instrument. A laser beam, focused perpendicular to the water flow, strikes particles as they pass through the beam generating unique light scattering patterns that are captured by photodetectors. Microorganisms produce patterns termed 'bio-optical signatures' which are comparable to fingerprints. By comparing these bio-optical signatures to an on-board database of microorganism patterns, detection and classification occurs within minutes. If a pattern is not recognized, it is classified as an 'unknown' and the unidentified contaminant is registered as a potential threat. In either case, if the contaminant exceeds a customer's threshold, the system will immediately alert personnel to the contamination event while extracting a sample for confirmation. The system, BioSentry^TM, developed by JMAR Technologies is now field-tested and commercially available. BioSentry is cost effective, uses no reagents, operates remotely, and can be used for continuous microbial surveillance in many water treatment environments. Examples of HLS installations will be presented along with data from the US EPA NHSRC Testing and Evaluation Facility.

Proceedings Article | 19 May 2006 Paper

A real-time early warning system for pathogens in water

John Adams, David McCarty, Kristina Crousore

Proceedings Volume 6218, 62180F (2006) https://doi.org/10.1117/12.663476

KEYWORDS: Water, Light scattering, Particles, Bacteria, Pathogens, Mie scattering, Scattering, Laser scattering, Sensors, Organisms

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The events of September 11, 2001 represented an escalation in the means and effects of terrorist attacks and raised awareness of the vulnerability of major infrastructures such as transportation, finance, power and energy, communications, food, and water. A re-examination of the security of critical assets was initiated. Actions were taken in the United States to protect our drinking water. Anti-terrorism monitoring systems that allow us to take action before contaminated water can reach the consumer have been under development since then. This presentation will discuss the current performance of a laser-based, multi-angle light scattering (MALS) technology for continuous, real-time detection and classification of microorganisms for security applications in all drinking and process water applications inclusive of protection of major assets, potable and distributed water. Field test data for a number of waterborne pathogens will also be presented.

Proceedings Article | 24 March 2006 Paper

Real-time on-line monitoring of process water for low concentrations of bacteria

John Adams, David McCarty, Kristina Crousore

Proceedings Volume 6152, 61523M (2006) https://doi.org/10.1117/12.656627

KEYWORDS: Particles, Bacteria, Light scattering, Water, Mie scattering, Sensors, Contamination, Scattering, Silica, Semiconductor manufacturing

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Naturally occurring outbreaks of bacteria have the potential to contaminate process water used in semiconductor manufacturing. Bacteria are normally filtered out in the water treatment process, however contamination can still occur from biofilm growth, filter or media break-through, and air vectors. Because there is seldom a residual disinfectant and system sanitation is intermittent, the manufacturer must rely on point of use filters to prevent contamination at critical points in the process. Particle counters in the distribution system can tell when the number of particles is increasing but cannot discriminate bacteria from small silica particles and often are unable to detect smaller gram-negative particles. If an on-line multi-angle light scattering system is used in place of particle counters or in conjunction with them, then the discrimination between silica particles and bacteria can be made and the proper action taken in the distribution system to help identify the contamination source, improve preventative maintenance, and ultimately increase yields. This paper describes the multi-angle light scattering method of detecting bacteria with the BioSentry^TMsystem to provide an effective real-time on-line water monitoring sensor.

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