1
|
Welleweerd MK, Hageman T, Pichel M, van As D, Keizer H, Hendrix J, Micheal MM, Khalil ISM, Mir A, Korkmaz N, Kräwinkel R, Chevrier DM, Faivre D, Fernandez-Castane A, Pfeiffer D, Abelmann L. An open-source automated magnetic optical density meter for analysis of suspensions of magnetic cells and particles. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:094101. [PMID: 36182516 DOI: 10.1063/5.0098008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 08/17/2022] [Indexed: 06/16/2023]
Abstract
We present a spectrophotometer (optical density meter) combined with electromagnets dedicated to the analysis of suspensions of magnetotactic bacteria. The instrument can also be applied to suspensions of other magnetic cells and magnetic particles. We have ensured that our system, called MagOD, can be easily reproduced by providing the source of the 3D prints for the housing, electronic designs, circuit board layouts, and microcontroller software. We compare the performance of our system to existing adapted commercial spectrophotometers. In addition, we demonstrate its use by analyzing the absorbance of magnetotactic bacteria as a function of their orientation with respect to the light path and their speed of reorientation after the field has been rotated by 90°. We continuously monitored the development of a culture of magnetotactic bacteria over a period of 5 days and measured the development of their velocity distribution over a period of one hour. Even though this dedicated spectrophotometer is relatively simple to construct and cost-effective, a range of magnetic field-dependent parameters can be extracted from suspensions of magnetotactic bacteria. Therefore, this instrument will help the magnetotactic research community to understand and apply this intriguing micro-organism.
Collapse
Affiliation(s)
- Marcel K Welleweerd
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Tijmen Hageman
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Marc Pichel
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Dave van As
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Hans Keizer
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Jordi Hendrix
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Mina M Micheal
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Islam S M Khalil
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Alveena Mir
- KIST Europe, Biosensors Group, Campus E7, 66123 Saarbrücken, Germany
| | - Nuriye Korkmaz
- KIST Europe, Biosensors Group, Campus E7, 66123 Saarbrücken, Germany
| | - Robbert Kräwinkel
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Daniel M Chevrier
- Aix-Marseille Université, CEA, CNRS, BIAM, UMR7265, 13108 Saint-Paul lez Durance, France
| | - Damien Faivre
- Aix-Marseille Université, CEA, CNRS, BIAM, UMR7265, 13108 Saint-Paul lez Durance, France
| | | | - Daniel Pfeiffer
- Lehrstuhl für Mikrobiologie, Universität Bayreuth, Universitätsstrasse 30, 95447 Bayreuth, Germany
| | - Leon Abelmann
- University of Twente, EWI/Robotics and Mechatronics, P.O. Box 217, 7500 AE Enschede, The Netherlands
| |
Collapse
|