Monitoring of biofilm growth with thickness-shear mode quartz resonators in different flow and nutrition conditions

Helle, Hannu; Vuoriranta, P.; Välimäki, Hannu; Lekkala, Jukka; Aaltonen, Viljakaisa

doi:10.1016/s0925-4005(00)00590-6

Cited by 20 publications

(10 citation statements)

References 47 publications

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“…The best known piezo-sensor of this kind, which is also applied in biofilm monitoring, is the so-called quartz crystal microbalance (QCM, Nivens et al 1993), also designated as thickness-shear mode quartz (TSM, Helle et al 2000). In this device the whole surface vibrates transversally when alternating voltage is applied to the electrodes.…”

Section: Sensors On Solid Surfacesmentioning

confidence: 99%

Online Biofilm Monitoring

Janknecht

Melo

2003

Re/Views in Environmental Science and Bio/Technology

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A review of online biofilm monitoring techniques is presented focusing on methods based on differential turbidimetry, light scattering, heat transfer, pressure drop, real-time measurement of metabolic products, image analysis, radiation signals (spectroscopy, fluorometry, photoacoustic spectroscopy, etc.), electric and mechanical (vibration) signals. The different methods are compared in terms of their applicability to practical situations and the know detection limits are reported.

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Section: Sensors On Solid Surfacesmentioning

confidence: 99%

Online Biofilm Monitoring

Janknecht

Melo

2003

Re/Views in Environmental Science and Bio/Technology

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“…Quartz crystal microbalance device (QMB), exploiting the decrease of vibration caused by material deposited on the crystal surface (Nivens et al, 1995;White et al, 1996). Earlier versions of these systems were extremely sensitive to temperature changes of the water while more recent devices have addressed this problem successfully (Helle et al, 2000).…”

Section: Levels Of Information Provided By Monitoring Systemsmentioning

confidence: 99%

Role and levels of real-time monitoring for successful anti-fouling strategies - an overview

Flemming

2003

Water Science and Technology

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Biofouling is a biofilm problem and any anti-fouling strategy will be greatly improved if the site and extent of biofilm growth can be monitored. A suitable monitoring system will provide early warning capacity and allow for specific optimization of countermeasures. As water samples do not give reliable information about biofilms, surface sampling is mandatory. Conventional biofilm monitoring techniques rely on removal of material from representative sites or on analysis of test surfaces which have been exposed. This procedure is time consuming and, depending on the parameters to be measured, requires skilled laboratory personnel. There is a strong demand for direct, on-line, in situ, continuous, non-destructive real-time information about biofilms in a system. Such demands can only be fulfilled by physical or physico-chemical methods, a number of which have already been successfully applied for biofilm monitoring. It is important, however, to be aware of the actual parameter they refer to in order to interpret the data properly. Three levels of information can be identified: (i) systems which detect increase and decrease of material accumulating on a surface but cannot differentiate between biomass and other components of a deposit, (ii) systems which provide biological information and distinguish between biotic and abiotic material, and (iii) systems which provide detailed chemical information. Examples for all three levels are presented and discussed.

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“…Microbial biofilm growth in aquatic systems was monitored using 10 MHz thicknessshear mode (TSM) resonators under varying nutrient and fluid velocity conditions (Helle et al, 2000). Resonator admittance magnitude was the electrical quantity monitored.…”

Section: Biofilm Adhesion and Attachmentmentioning

confidence: 99%