Jan-Ole Reese

• Reese, Jan-Ole; Lund, Ingrid Maria Castro; Haugen, Håvard Jostein; Saragliadis, Athanasios; Lyngstadaas, Ståle Petter & Linke, Dirk (2026). A dual-loop chemostat to investigate multi-species biofilms on implant surfaces under adjustable flow conditions. Frontiers in Microbiology. 17. doi: 10.3389/fmicb.2026.1751315. Fulltekst i vitenarkiv Vis sammendrag

  Natural biofilms are typically composed of a mix of different microbial species and are often exposed to strong shear forces resulting from liquid flow. Simple biofilm models that attempt to study biofilms are based on a single species and on static growth conditions. To overcome these limitations, we developed a modular dual-loop reactor that decouples bacterial cultivation from hydrodynamic exposure, enabling independent control of nutrient availability (and thus, cell density) and flow rate (and thus, shear stress). Importantly, the system allows for testing different surface materials in a systematic manner. To validate our setup, we used a community of six keystone members of oral biofilms in conjunction with titanium materials of defined roughness that mimic dental implant surfaces. We found that biofilm mass, robustness, and species distribution not only differ significantly between static and dynamic growth conditions, but also vary strongly with different flow velocities. The biofilms formed under flow could be separated into two fractions, one that washed away very easily, and a more robust, basal layer. At low shear forces, overall biofilm mass was the highest, but at the expense of biofilm robustness. At medium shear forces, the robust fraction of the biofilm had the highest relative content of extracellular matrix. At the highest flow rates, the biofilm mass was low, but late colonizers (represented by the oral pathogens Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans ) had the lowest relative abundance. This is in accordance with the concept that high flow of saliva reduces the risk of oral disease. Future applications of our system will include the systematic testing of antimicrobial coatings or surface design effects under defined flow regimes, opening the path toward better medical implants.

• Reese, Jan-Ole; Lund, Ingrid M. Castro; Haugen, Håvard Jostein; Saragliadis, Athanasios; Lyngstadaas, Ståle Petter & Linke, Dirk (2026). A dual-loop chemostat to investigate multi-species biofilms on different materials under adjustable flow conditions. Frontiers in Microbiology. 17. Fulltekst i vitenarkiv Vis sammendrag

  Natural biofilms are typically composed of a mix of different microbial species and are often exposed to strong shear forces resulting from liquid flow. Simple biofilm models that attempt to study biofilms are based on a single species and on static growth conditions. To overcome these limitations, we developed a modular dual-loop reactor that decouples bacterial cultivation from hydrodynamic exposure, enabling independent control of nutrient availability (and thus, cell density) and flow rate (and thus, shear stress). Importantly, the system allows for testing different surface materials in a systematic manner. To validate our setup, we used a community of six keystone members of oral biofilms in conjunction with titanium materials of defined roughness that mimic dental implant surfaces. We found that biofilm mass, robustness, and species distribution not only differ significantly between static and dynamic growth conditions, but also vary strongly with different flow velocities. The biofilms formed under flow could be separated into two fractions, one that washed away very easily, and a more robust, basal layer. At low shear forces, overall biofilm mass was the highest, but at the expense of biofilm robustness. At medium shear forces, the robust fraction of the biofilm had the highest relative content of extracellular matrix. At the highest flow rates, the biofilm mass was low, but late colonisers (represented by the oral pathogens Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans) had the lowest relative abundance. This is in accordance with the concept that high flow of saliva reduces the risk of oral disease. Future applications of our system will include the systematic testing of antimicrobial coatings or surface design effects under defined flow regimes, opening the path towards better medical implants.

Se alle arbeider i NVA

• Lund, Ingrid Maria Castro; Reese, Jan-Ole; Saragliadis, Athanasios; Lyngstadaas, Ståle Petter; Haugen, Håvard Jostein & Linke, Dirk (2025). Discovering the species-specific dynamics within a model biofilm system for peri-implantitis. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Lund, Ingrid Maria Castro; Haugen, Håvard Jostein; Saragliadis, Athanasios; Lyngstadaas, Ståle Petter & Linke, Dirk (2025). Development of a flow-controlled biofilm model to facilitate the testing of debridement treatments of dental implant surfaces. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Saragliadis, Athanasios; Haugen, Håvard Jostein & Linke, Dirk (2024). Small-scale bioreactor setup to create a multi-species oral biofilm model for evaluating medical approaches in dentistry. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Saragliadis, Athanasios; Haugen, Håvard Jostein & Linke, Dirk (2023). Development of multi-species biofilm models for testing biotechnological approaches in dentistry. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Haugen, Håvard Jostein; Saragliadis, Athanasios & Linke, Dirk (2023). Development of multi-species biofilm models for evaluating medical approaches in dentistry. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Saragliadis, Athanasios; Haugen, Håvard Jostein & Linke, Dirk (2023). Development of multi-species biofilm models for evaluating medical approaches in dentistry. Fulltekst i vitenarkiv
• Reese, Jan-Ole; Saragliadis, Athanasios; Haugen, Håvard Jostein & Linke, Dirk (2022). Development of multi-species biofilm models for testing biotechnological approaches in dentistry. Fulltekst i vitenarkiv

Se alle arbeider i NVA