Relevant bibliographies by topics / Bacterial behaviour

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Bacterial behaviour'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Bacterial behaviour"

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Brown, R., H. Campbell, and N. Geary. "Bacterial peptides and behaviour." Biological Psychology 37, no. 1 (October 1993): 64. http://dx.doi.org/10.1016/0301-0511(93)90059-h.

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Colin, R., R. Zhang, and L. G. Wilson. "Fast, high-throughput measurement of collective behaviour in a bacterial population." Journal of The Royal Society Interface 11, no. 98 (September 6, 2014): 20140486. http://dx.doi.org/10.1098/rsif.2014.0486.

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Swimming bacteria explore their environment by performing a random walk, which is biased in response to, for example, chemical stimuli, resulting in a collective drift of bacterial populations towards ‘a better life’. This phenomenon, called chemotaxis, is one of the best known forms of collective behaviour in bacteria, crucial for bacterial survival and virulence. Both single-cell and macroscopic assays have investigated bacterial behaviours. However, theories that relate the two scales have previously been difficult to test directly. We present an image analysis method, inspired by light scattering, which measures the average collective motion of thousands of bacteria simultaneously. Using this method, a time-varying collective drift as small as 50 nm s −1 can be measured. The method, validated using simulations, was applied to chemotactic Escherichia coli bacteria in linear gradients of the attractant α-methylaspartate. This enabled us to test a coarse-grained minimal model of chemotaxis. Our results clearly map the onset of receptor methylation, and the transition from linear to logarithmic sensing in the bacterial response to an external chemoeffector. Our method is broadly applicable to problems involving the measurement of collective drift with high time resolution, such as cell migration and fluid flows measurements, and enables fast screening of tactic behaviours.
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Hu, Hong-Ying, Koichi Fujie, and Kohei Urano. "Dynamic Behaviour of Aerobic Submerged Biofilter." Water Science and Technology 28, no. 7 (October 1, 1993): 179–85. http://dx.doi.org/10.2166/wst.1993.0160.

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Dynamic behaviour of microbial film and BOD removal characteristics in an aerobic submerged biofilter packed with ceramic balls were investigated. The effects of BOD loading and temperature on the populations of bacteria and protozoa inhabiting microbial film were investigated. It was ascertained that the BOD removal rate by the microbial film was controlled by the bacterial population, while the microbial concentration in the biofilter was due to the growth of protozoa when the temperature and the BOD loading were low. The analysis of bacterial quinone mixtures was successfully applied to identify the bacterial population in the microbial film.
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Ishimoto, Kenta. "Bacterial spinning top." Journal of Fluid Mechanics 880 (October 10, 2019): 620–52. http://dx.doi.org/10.1017/jfm.2019.714.

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We have investigated the dynamics of a monotrichous bacteria cell near a wall boundary, taking elastic hook flexibility into consideration. Combining theoretical linear stability analysis and direct numerical computations via the boundary element method, we have found that the elastohydrodynamic coupling between the hook elasticity and cell rotational motion enables a stable vertical spinning behaviour like a low-Reynolds-number spinning top. The forwardly rotated flagellum, which generates the force exertion pushing towards the cell body, typically destabilizes the vertical upright position and leads to a boundary-following motion. In contrast, the backward rotation of the flagellum, generating a force pulling the cell body, contributes to stable upright behaviour in a large range of hook rigidity. Further numerical investigations have demonstrated that the non-spherical geometry of the cell body and boundary adhesive interactions affect the bacterial dynamics, leading to complex behaviours such as horizontal spinning and unstable vertical spinning motions, both of which are experimentally observed in Pseudomonas aeruginosa bacteria. These results highlight the rich diversity of bacterial surface motility emerging from mechanical boundary interactions coupled with the cell swimming and hook flexibility.
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Tran, T. T. T., K. Kannoorpatti, A. Padovan, and S. Thennadil. "A study of bacteria adhesion and microbial corrosion on different stainless steels in environment containing Desulfovibrio vulgaris." Royal Society Open Science 8, no. 1 (January 13, 2021): 201577. http://dx.doi.org/10.1098/rsos.201577.

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Stainless steel is an important material used in many applications due to its mechanical strength and corrosion-resistant properties. The high corrosion resistance of stainless steel is provided by the passive film. Different stainless steels have different alloy elements and surface properties which could have a significant influence on bacterial attachment to the surface and thus might result in different microbial corrosion behaviours. In this study, the effect of adhesion of sulfate-reducing bacteria (SRB) on corrosion behaviour in artificial seawater on different stainless steels was investigated. Stainless steel materials used were SS 410, SS 420, SS 316 and DSS 2205 and pure chromium. The contact angle was measured to study the effect of surface properties of materials. Adhesion was measured by counting cells attached to the surface of materials. The corrosion behaviour of the materials was measured by electrochemical testing including measuring open circuit potential, electrochemical impedance spectroscopy and potentiodynamic behaviour. The long-term corrosion behaviour of each material was studied after six months of exposure by measuring weight loss and surface analysis with scanning electron microscope with energy-dispersive X-ray analysis. Hydrophobicity had a strong effect on bacterial attachment. Alloying elements e.g. nickel also had shown its ability to attract bacteria to adhere on the surface. However, the corrosion rate of different materials is determined not only by bacterial attachment but also by the stability of the passive film which is determined by the alloying elements, such as Mo and Cr. Chromium showed high resistance to corrosion, possibly due to toxicity on bacterial attachment. The nature of bacterial attachment and corrosion behaviour of the materials are discussed.
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Kijlstra, J., and A. van der Wal. "Electrokinetic behaviour of bacterial suspensions." Bioelectrochemistry and Bioenergetics 37, no. 2 (June 1995): 149–51. http://dx.doi.org/10.1016/0302-4598(94)01753-n.

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Jarrett, Angela M., and Nicholas G. Cogan. "The ups and downs of S. aureus nasal carriage." Mathematical Medicine and Biology: A Journal of the IMA 36, no. 2 (May 15, 2018): 157–77. http://dx.doi.org/10.1093/imammb/dqy006.

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Abstract Staphylococcus aureus infections are a growing concern worldwide due to the increasing number of strains that exhibit antibiotic resistance. Recent studies have indicated that some percentage of people carry the bacteria in the nasal cavity and therefore are at a higher risk of subsequent, and more serious, infections in other parts of the body. However, individuals carrying the infection can be classified as only intermittent carriers versus persistent carriers, being able to eliminate the bacteria and later colonized again. Using a model of bacterial colonization of the anterior nares, we investigate oscillatory patterns related to intermittent carriage of S. aureus. Following several studies using global sensitivity analysis techniques, various insights into the model’s behaviour were made including interacting effects of the bacteria’s growth rate and movement in the mucus, suggesting parameter connections associated with biofilm-like behaviour. Here the bacterial growth rate and bacterial movement are explicitly connected, leading to expanded oscillatory behaviour in the model. We suggest possible implications that this oscillatory behaviour can have on the definition of intermittent carriage and discuss differences in the bacterial virulence dependent upon individual host health. Furthermore, we show that connecting the bacterial growth and movement also expands the region of the parameter space for which the bacteria are able to survive and persist.
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Smith, Harry. "Questions about the behaviour of bacterial pathogens in vivo." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, no. 1397 (May 28, 2000): 551–64. http://dx.doi.org/10.1098/rstb.2000.0597.

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Bacterial pathogens cause disease in man and animals. They have unique biological properties, which enable them to colonize mucous surfaces, penetrate them, grow in the environment of the host, inhibit or avoid host defences and damage the host. The bacterial products responsible for these five biological requirements are the determinants of pathogenicity (virulence determinants). Current knowledge comes from studies in vitro , but now interest is increasing in how bacteria behave and produce virulence determinants within the infected host. There are three aspects to elucidate: bacterial activities, the host factors that affect them and the metabolic interactions between the two. The first is relatively easy to accomplish and, recently, new methods for doing this have been devised. The second is not easy because of the complexity of the environment in vivo and its ever–changing face. Nevertheless, some information can be gained from the literature and by new methodology. The third aspect is very difficult to study effectively unless some events in vivo can be simulated in vitro . The objectives of the Discussion Meeting were to describe the new methods and to show how they, and conventional studies, are revealing the activities of bacterial pathogens in vivo . This paper sets the scene by raising some questions and suggesting, with examples, how they might be answered. Bacterial growth in vivo is the primary requirement for pathogenicity. Without growth, determinants of the other four requirements are not formed. Results from the new methods are underlining this point. The important questions are as follows. What is the pattern of a developing infection and the growth rates and population sizes of the bacteria at different stages? What nutrients are present in vivo and how do they change as infection progresses and relate to growth rates and population sizes? How are these nutrients metabolized and by what bacterial mechanisms? Which bacterial processes handle nutrient deficiencies and antagonistic conditions that may arise? Conventional and new methods can answer the first question and part of the second; examples are described. The difficulties of trying to answer the last two are discussed. Turning to production in vivo of determinants of mucosal colonization, penetration, interference with host defence and damage to the host, here are the crucial questions. Are putative determinants, which have been recognized by studies in vitro , produced in vivo and are they relevant to virulence ? Can hitherto unknown virulence determinants be recognized by examining bacteria grown in vivo ? Does the complement of virulence determinants change as infection proceeds? Are regulatory processes recognized in vitro , such as ToxR/ToxS, PhoP/PhoQ , quorum sensing and type III secretion, operative in vivo? What environmental factors affect virulence determinant production in vivo and by what metabolic processes? Examples indicate that the answers to the first four questions are ‘yes’ in most but not all cases. Attempts to answer the last, and most difficult, question are also described. Finally, sialylation of the lipopolysaccharide of gonococci in vivo by host–derived cytidine 5'–monophospho–N–acetyl neuraminic acid, and the effect of host lactate are described. This investigation revealed a new bacterial component important in pathogenicity, the host factors responsible for its production and the metabolism involved.
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Masi, Elisa, Marzena Ciszak, Luisa Santopolo, Arcangela Frascella, Luciana Giovannetti, Emmanuela Marchi, Carlo Viti, and Stefano Mancuso. "Electrical spiking in bacterial biofilms." Journal of The Royal Society Interface 12, no. 102 (January 2015): 20141036. http://dx.doi.org/10.1098/rsif.2014.1036.

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In nature, biofilms are the most common form of bacterial growth. In biofilms, bacteria display coordinated behaviour to perform specific functions. Here, we investigated electrical signalling as a possible driver in biofilm sociobiology. Using a multi-electrode array system that enables high spatio-temporal resolution, we studied the electrical activity in two biofilm-forming strains and one non-biofilm-forming strain. The action potential rates monitored during biofilm-forming bacterial growth exhibited a one-peak maximum with a long tail, corresponding to the highest biofilm development. This peak was not observed for the non-biofilm-forming strain, demonstrating that the intensity of the electrical activity was not linearly related to the bacterial density, but was instead correlated with biofilm formation. Results obtained indicate that the analysis of the spatio-temporal electrical activity of bacteria during biofilm formation can open a new frontier in the study of the emergence of collective microbial behaviour.
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Budrikis, Zoe. "A catalogue of bacterial swarm behaviour." Nature Reviews Physics 2, no. 5 (April 7, 2020): 226. http://dx.doi.org/10.1038/s42254-020-0172-x.

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Dissertations / Theses on the topic "Bacterial behaviour"

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Micali, Gabriele. "Bacterial chemotaxis : from information processing to behaviour." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/50712.

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Chemotaxis allows flagellated bacteria to navigate in complex chemical environments, following nutrients and escaping toxins. The sensory system made up of chemoreceptors is constantly monitoring the extracellular concentrations of nutrients and toxins, while the signalling pathway processes and transmits the external information to the flagellated motors for movement. In the case of Escherichia coli, the chemotaxis pathway has been extensively characterised experimentally using genetics, biochemistry, and a wide range of imaging tools. This makes E. coli an ideal model organism for quantitative analysis and modelling. Several remarkable properties of the E. coli chemotaxis pathway have been summarised in terms of design principles. However, the swimming behaviour remains poorly understood, even for genetically identical cells in the artificial conditions normally used in a laboratory. Here, I propose an interdisciplinary approach, which combines theory, computational simulations, and experimental data from my collaborators, to study E. coli chemotaxis from an information-theoretic point of view. I demonstrate that the E. coli chemotaxis pathway is designed to optimally transmit environmental information over a certain range of concentrations and gradients. To do so, I develop a theory that identifies both the responses and the environmental conditions that transmit maximal environmental in- formation. Interestingly, when maximal information is transmitted, the behaviour characterised in terms of the drift velocity towards the nutrient is also maximised. A new design principle is proposed: maximal information transmission leads to maximal drift. Furthermore, the energetic cost of chemotaxis is much lower than the energy consumed to maintain the biological signalling pathway. Hence, thermodynamics does not seem to set constraints on information transmission and drift. However, to fully capitalise on my results, a closer connection with single-cell experiments is suggested.
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Farrell, Fred Desmond Casimir. "Modelling collective behaviour and pattern formation in bacterial colonies." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10452.

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In this Thesis I present simulation- and theory-based studies of pattern formation and growth in collections of micro-organisms, in particular bacterial colonies. The aim of these studies is to introduce simple models of the 'micro-scale' behaviour of bacterial cells in order to study the emergent behaviour of large collections of them. To do this, computer simulations and theoretical techniques from statistical physics, and in particular non-equilibrium statistical physics, were used, as the systems under study are far from thermodynamic equilibrium, in common with most biological systems. Since the elements making up these sytems - the micro-organisms - are active, constantly transducing energy from their environment in order to move and grow, they can be viewed as `active matter' systems. First, I describe my work on a generalization of an archetypal model of active matter - the Vicsek model of flocking behaviour - in which the speed of motion of active particles depends on the local density of particles. Such an interaction had previously been shown to be responsible for some forms of pattern formation in bacterial colonies grown on agar plates in the laboratory. Simulations and theory demonstrated a variety of pattern formation in this system, and these results may be relevant to explaining behaviour observed in experiments done on collections of molecular motors and actin fibres. I then go on to describe work on modelling pattern formation and growth in bacterial biofilms - dense colonies of cells growing on top of solid surfaces. I introduce a simple simulation model for the growth of non-motile cells on a flat surface, whereby they move only by growing and pushing on each other as they grow. Such colonies have previously been observed experimentally to demonstrate a transition from round to 'branched' colonies, with a pattern similar to diffusion-limited aggregation. From these simulations and analytical modelling, a theory of the growth of such colonies is developed which is quite different from previous theories. For example, I find that the colony cannot grow at a constant speed if the cells are not compressible. Finally, I present some results on genetic drift and evolution in growing bacterial colonies. Genetic drift is greatly enhanced in colonies which are expanding in space, as only a few individuals at the edge of the population are able to pass on their genes onto their progeny. The individual-based simulations of biofilms described above are used to analyse which factors - such as the shape of the colony, the thickness of the growing layer of cells, and the interactions between the cells - affect the rate of genetic drift and the probability of fixation of beneficial mutations. This has implications, for example, for the evolution of antibiotic resistance in such colonies.
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Chacko, Sarah Jane. "Surface attachment behaviour in Rhodobacter sphaeroides." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:943eb194-b147-4cb9-bbc2-a9fd04a45949.

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Motility and chemotaxis have been implicated in the process of biofilm formation in a wide range of species. Using a combination of microscopy and image analysis, genetics, microbiology and biochemistry, the initial approach of Rhodobacter sphaeroides cells to a solid surface has been characterised. Interestingly, these data suggest that for R. sphaeroides alterations in motility and swimming behaviour may result in differences in biofilm formation simply by changing the number of cells which reach the surface. This is in contrast to a few other well-studied species where the motility apparatus, the flagellum, has been shown to play an active role in surface sensing and the transition to biofilm growth. Tracking swimming cells and measuring surface attachment revealed that changes in motility affect the ability of cells to attach to a surface, with non-motile cells attaching least and mutants with frequent stops attaching less than smooth swimming cells with few stops. Tracking attaching cells and classifying their method of attachment revealed that flagellar tethering is not essential for R. sphaeroides attachment. Competition assays with fluorescently labelled strains showed that the initial imbalance between motile and non-motile cells remains as microcolonies develop over 48 hours,and the proportion of non-motile cells remains fairly constant. Development on a surface over 48 hours was similar for motile and non-motile strains, including aflagellate strains, once attached. Using parameters calculated by tracking swimming cells to calculate the effective diffusion coefficient in a simple model of cell movement suggested that motion alone could explain the differences in attachment without assuming different cell properties. In particular, aflagellate strains might be hindered from surface attachment by their reduced motility alone. This is interesting since some other bacterial species use the flagellum as a surface sensor.
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Jeziorska, Wanda. "The behavioural responses of Rhodobacter sphaeroides to carbohydrates." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305506.

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Mina, Petros. "Mathematical modelling and analysis of emergent behaviour in bacterial populations." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.628994.

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This thesis develops and analyses an agent based model of a bacterial Eschericia coli population in a quorum motivated by published experimental work The E. coli cells harbour a synthetic genetic regulatory network that is responsible for oscillatory behaviour across the population. The model is used to understand whether the collective oscillations seen in the experiments are an outcome of coupled oscillators synchronising or if they are an emergent property of the population. A bottom-up approach is used whereby an ordinary differential equation model is developed based on the biochemical dynamics that result from the introduced genetic network This model is studied using numerical bifurcation analysis, from the single cell level to see whether oscillatory behaviour exists and if such behaviour persists when groups of coupled cells are considered. Subsequently, the model is extended and an explicit spatial dimension is included to study any spatiotemporal effects that can affect the nature of oscillations. The spatial model is implemented in BSim, a novel software platform developed in Bristol, by students of the Bristol Centre for Complexity Sciences, to study bacterial population dynamics in silica. Finally, we study the possibility of controlling the cellular population, an area that has received a lot of attention recently in cellular biology. Specifically, we compare the performance of open and closed loop control in entraining the population to follow a non-native oscillating period. Vve also compare the ability to make the population track a non-oscillating signal. Our results indicate that the oscillatory behaviour seen in the published experiments is an emergent population level property. The onset and synchronisation of oscillations are dependent on cell density and the speed of diffusion of the coupling chemical in the environment medium. Also, the oscillating population is best controlled with closed loop methods.
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Reise, Franziska [Verfasser]. "Functional glycomimetics to explore bacterial adhesion and membrane behaviour: Synthesis and applications / Franziska Reise." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1177033623/34.

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Bass, Catherine Jennifer. "Survival of sulphate-reducing bacteria from oil field reservoirs : characteristics and behaviour of sulphidogenic bacterial consortia from oil field reservoirs under simulated laboratory conditions." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324131.

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Li, Martin. "Experimental study of swimming flagellated bacteria and their collective behaviour in concentrated suspensions." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4787.

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This thesis investigates bacterial motility from the mechanism permitting individual selfpropulsion to the complex collective flocking motility in Escherichia coli and Bacillus subtilis cells. Understanding bacterial swimming has intrigued scientists for decades and recently there has been a growing interest in collective swimming behaviour. The first part of this thesis reviews the characteristics of E. coli and B. subtilis cells subsequently describing the governing physics and constraints of self-propulsion in the low Reynolds regime. The second part of this thesis presents three self-contained experimental sections, examining individual swimming in non-conventional body shaped cells and subsequently focusing on concentrated bacterial swimming in normal cells. We first investigated motility in mutant spherical E. coli cells KJB24 motivated by simulations, which often model bacteria as self-propelled spheres. Somewhat unexpectedly these spherical cells do not exhibit runs and tumbles but diffuse slower than expected. As an introduction to working with microbiology and to familiarise with microbiology techniques we investigated why these spherical cells do not swim. Secondly we investigated how cellular motility varies as a function of body length by inhibiting cell division in wild-type E. coli with cephalexin; which remained motile despite body elongation. Fluorescent flagella visualization provided evidence of multiple bundle formations along the lateral walls as a mechanism to sustain motility. The average swimming velocity, body and flagella rotation rates, the number of flagella and number of flagella bundles were extracted experimentally as a function of length. The extracted experimental parameters for normal sized cells were consistent with Purcell’s model. We explored simple adaptations and scaling of this model to describe motility for filamentous cells, which agrees with experimental values. The main focus is on collective behaviour of B. subtilis by examining the onset from individual swimming to collective motility using time-lapse microscopy. Results demonstrated a smooth transition where cells self-organize into domains expanding rapidly by recruiting cells. We present advancements in B. subtilis fluorescent flagella staining which revealed unexpected multiple flagella bundle arrangements during runs, contradictory to general conjectures. Novel visualisation of flagella filaments during reversal events is presented in both E. coli and B. subtilis cells, providing experimental evidence for complex flagella ‘flipping’. Cellular reversal is hypothesized as a mechanism for quorum polarity facilitating collective swimming. We present novel flagella imaging in the setting of collective behaviour showing evidence to support quorum polarity. Subsequently we extracted the run length distributions of cells as a function of concentration, yielding a decreasing trend with increasing concentration. Using particle tracking we quantitatively extracted the mean squared displacement of swimming cells versus passive tracers at different concentrations during collective swimming, these novel results are discussed in respect to recent simulations. These presented experiments provide new insights into collective behaviour improving current understanding of this phenomenon.
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Sekora, Michael David. "Tactic behaviors in bacterial dynamics." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32915.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.
Includes bibliographical references (leaves 89-90).
The locomotion of a wide class of motile bacteria can be mathematically described as a biased random walk in three-dimensional space. Fluid mechanics and probability theory are invoked to model the dynamics of bacteria swimming using tactic behaviors (movements or reorientation in response to chemical, physical or environmental stimuli) in flowing, viscous media. Physical descriptions are developed for bacterial chemotaxis (response to chemical agents) near particles exuding attractants, a small-scale process with global-scale implications for the biogeochemistry of the oceans. Three cases were investigated: a stationary particle, a slowly moving particle and a particle that generates a hydrodynamic wake in the form of attached vortices. The key finding of this thesis consists in the discovery of several scenarios in which motile bacteria swimming via random walks put themselves at a disadvantage in their quest for food with respect to non-motile pacteria. Thus, there exist threshold values in nutrient gradients and bacterial chemosensory ability below which bacteria would be better served if they did not swim. In the presence of vortices, it was discovered that bacteria can exploit the recirculating flow field to vastly increase their nutrient supply, but only if they alter their swimming behavior as a function of the concentration field.
(cont.) Otherwise, slow bacteria completely miss the hydrodynamic wake (and the high nutrient region) behind a nearby moving particle, while fast bacteria end up colonizing the particle (i.e. clustering around the particle and potentially anchoring themselves to it). These processes are currently under investigation in laboratory experiments using high-speed digital photography, for which software (BacTrackTM) was written that can locate and track multiple bacteria over time, with the aim of providing trajectories and their statistics and ultimately establish the importance of these phenomena for marine ecology and biogeochemistry. Preliminary experiments were conducted with Escherichia coli being exposed to ultraviolet radiation, documenting the known result of E. coli being repelled by UV radiation and providing a successful test bed for the reliability of the tracking software.
by Michael David Sekora.
S.B.
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Massé, Cécile. "Effets de la bioturbation sur la diversité des communautés bactériennes du sédiment : approches expérimentale et in-situ : de Melinna palmata aux communautés de la vasière Ouest-Gironde." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0039/document.

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Le lien entre la macrofaune et les communautés bactériennes benthiques a été déterminé selon deux approches : (1) une approche expérimentale à l’échelle de l’individu ciblée sur les effets de l’activité et de la bioturbation du polychète déposivore de surface Melinna palmata sur la distribution des communautés bactériennes des premiers millimètres de l’interface eau-sédiment ; (2) une approche in situ à l’échelle de la communauté de mise en corrélation des patrons spatiaux de distribution des communautés de macrofaune et de bactéries.Melinna palmata appartient à un nouveau groupe fonctionnel de bioturbation décrit pour la première fois, convoyeur de surface. L’utilisation de ce nouveau modèle biologique a permis de mettre en évidence que les activités de prospection et d’égestions modifient significativement la distribution des communautés bactériennes de la couche oxique de l’interface eau-sédiment. Ce lien est à la fois influencé par l’apport de matière organique de différentes qualités, et impacte la consommation et la minéralisation de cette matière organique.Le lien entre les patrons spatiaux de distribution des communautés de macrofaune et de bactéries a été étudié in situ, dans la vasière Ouest-Gironde. Les deux compartiments ont évolué le long d’un gradient avéré de teneur en matière organique et de taille des particules dans cette vasière.La corrélation des matrices biologiques n’a cependant pas été statistiquement significative et nécessite d’être approfondi
The link between benthic macrofauna and bacterial communities was assessed with two different approaches: (1) an experimental approach at the individual scale, focused on the effects of behaviour and bioturbation of the deposit feeder polychaete Melinna palmata on the bacteria lcommunity distribution on the very sediment-water interface; (2) an in situ approach at the scale of the community, focused on the correlation between spatial distribution patterns of the two biological compartments. Melinna palmata belongs to a new functional group of bioturbation described for the first time: surface conveyor. Its use allowed determining that prospection and egestion induced a significant change of bacterial communities on the sediment-water interface. This link was influenced by organic matter enrichment while influencing its fate. In a second part, the link between spatial distribution patterns of the communities was assessed in situ in the West-Gironde mud patch. Both macrofauna and bacteria changed along a gradient of organic matter quantity and quality and of particles size described in this system. However, the correlation between matrices was not statistically significant and needs to be more developed
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Books on the topic "Bacterial behaviour"

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Alan, Crump, ed. Sexy orchids make lousy lovers & other unusual relationships. Chicago: The University of Chicago Press, 2009.

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Nelson, David R., and Ariel Amir. Defects on cylinders: superfluid helium films and bacterial cell walls. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198789352.003.0016.

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There is a deep analogy between the physics of crystalline solids and the behaviour of superfluids, dating back to the pioneering work of Phillip Anderson, Paul Martin, and others. The stiffness to shear deformations in a periodic crystal resembles the super-fluid density that controls the behaviour of supercurrents in neutral superfluids such as He4. Dislocations in solids have a close analogy with quantized vortices in superfluids. Remarkable recent experiments on the way rod-shaped bacteria elongate their cell walls have focused attention on the dynamics and interactions of point-like dislocation defects in partially-ordered cylindrical crystalline monolayers. In these lectures, we review the physics of superfluid helium films on cylinders and discuss how confinement in one direction affects vortex interactions with supercurrents. Although there are similarities with the way dislocations respond to strains on cylinders, important differences emerge due to the vector nature of the topological charges characterizing the dislocations.
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DiChiara, Kathleen. End Chronic Disease: The Healing Power of Beliefs, Behaviors, and Bacteria. Hay House, Incorporated, 2020.

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(Editor), F. C. Cabello, D. Hulinska (Editor), and H. P. Godfrey (Editor), eds. Molecular Biology of Spirochetes (NATO Science Series: Life and Behavioural Sciences, Vol. 373) (Nato Science). IOS Press, 2006.

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Giraldeau, Luc-Alain, Philipp Heeb, and Michael Kosfeld, eds. Investors and Exploiters in Ecology and Economics. The MIT Press, 2018. http://dx.doi.org/10.7551/mitpress/9780262036122.001.0001.

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In the natural world, some agents (investors) employ strategies that provide resources, services, or information while others (exploiters) achieve gain through these efforts. Such behavior coexists and is observable in many species at many levels: from bacteria which depend on the existence of biofilms to synthesize constituent proteins; to cancerous cells which employ angiogenesis in tumors; to parents who forego vaccinating their children yet benefit from herd immunity; to countries’ actions in the handling of greenhouse gases. To analyze such behavior, two independent research traditions have developed in parallel—one couched in evolutionary theory championed by behavioral ecologists, the other in the social sciences advocated by economists. This book looks for commonalities in understanding and approach, in an effort to spur research into this widespread phenomenon.
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Sheppard, Charles R. C., Simon K. Davy, Graham M. Pilling, and Nicholas A. J. Graham. Microbial, microalgal and planktonic reef life. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198787341.003.0005.

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Microbes, including bacteria, archaea, viruses, fungi, protozoans and microalgae, are the most abundant and arguably the most important members of coral reef communities. They occur in the water column and sediment, and in association with other reef organisms. This chapter describes the abundance, diversity, function and productivity of microbes, with an emphasis on free-living types. They are key to recycling and retention of organic matter via the ‘microbial loop’, and are an important food source for larger reef organisms. The metazoan zooplankton are also described, including larvae of most reef invertebrates and fish. They are described in terms of their duration in the plankton, their settlement behaviour (e.g. that of coral larvae), their daily migration patterns and their role as a food source for larger organisms. Their importance for inter-reef connectivity is discussed.
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Birch, Jonathan. Gene Mobility and the Concept of Relatedness. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198733058.003.0006.

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Social behaviour is widespread in the microbial world, yet social evolution theory was mostly developed with multicellular animals in mind. One difference between multicellular organisms and microbes is the prevalence of mobile genetic elements, such as plasmids, in microbial populations. Plasmids are often implicated in the production of so-called public goods, and relatedness may be at the heart of this phenomenon. However, gene mobility introduces a temporal aspect to relatedness: because genotypes can change over the life cycle, two bacteria may share a gene at one time point, but not at some earlier or later time point. This chapter argues that the best concept of relatedness in this context is a diachronic concept that captures the association between actor genotypes at the moment of gene expression and recipient genotypes at the end of the life cycle.
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West-Eberhard, Mary Jane. Developmental Plasticity and Evolution. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195122343.001.0001.

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The first comprehensive synthesis on development and evolution: it applies to all aspects of development, at all levels of organization and in all organisms, taking advantage of modern findings on behavior, genetics, endocrinology, molecular biology, evolutionary theory and phylogenetics to show the connections between developmental mechanisms and evolutionary change. This book solves key problems that have impeded a definitive synthesis in the past. It uses new concepts and specific examples to show how to relate environmentally sensitive development to the genetic theory of adaptive evolution and to explain major patterns of change. In this book development includes not only embryology and the ontogeny of morphology, sometimes portrayed inadequately as governed by "regulatory genes," but also behavioral development and physiological adaptation, where plasticity is mediated by genetically complex mechanisms like hormones and learning. The book shows how the universal qualities of phenotypes--modular organization and plasticity--facilitate both integration and change. Here you will learn why it is wrong to describe organisms as genetically programmed; why environmental induction is likely to be more important in evolution than random mutation; and why it is crucial to consider both selection and developmental mechanism in explanations of adaptive evolution. This book satisfies the need for a truly general book on development, plasticity and evolution that applies to living organisms in all of their life stages and environments. Using an immense compendium of examples on many kinds of organisms, from viruses and bacteria to higher plants and animals, it shows how the phenotype is reorganized during evolution to produce novelties, and how alternative phenotypes occupy a pivotal role as a phase of evolution that fosters diversification and speeds change. The arguments of this book call for a new view of the major themes of evolutionary biology, as shown in chapters on gradualism, homology, environmental induction, speciation, radiation, macroevolution, punctuation, and the maintenance of sex. No other treatment of development and evolution since Darwin's offers such a comprehensive and critical discussion of the relevant issues. Developmental Plasticity and Evolution is designed for biologists interested in the development and evolution of behavior, life-history patterns, ecology, physiology, morphology and speciation. It will also appeal to evolutionary paleontologists, anthropologists, psychologists, and teachers of general biology.
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Book chapters on the topic "Bacterial behaviour"

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Smith, Harry. "The Behaviour of Bacterial Pathogens in Vivo." In Molecular Microbiology, 319–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72071-0_18.

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Waimer, Frédéric, and Jan Knippers. "Design Equilibrium of Form, Materiality and Fabrication: A Bacterial-Inspired Multidisciplinary Optimisation Strategy for Free-Form Concrete Structures." In Modelling Behaviour, 303–13. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24208-8_26.

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Jabbari, Sara, and John R. King. "Discrete and Continuum Multiscale Behaviour in Bacterial Communication." In Multiscale Computer Modeling in Biomechanics and Biomedical Engineering, 299–320. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/8415_2012_155.

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Majumdar, Sarangam, and Sisir Roy. "MathematicalModels of Bacterial Swarming Behaviour Regulated by Quorum Sensing." In Microbial Communication, 53–57. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7417-7_5.

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Karavolos, Michail H., and C. M. Anjam Khan. "Host Neuroendocrine Stress Hormones Driving Bacterial Behaviour and Virulence." In Heat Shock Proteins, 387–98. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6787-4_25.

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Subramani, Ramesh, and Mani Jayaprakashvel. "Bacterial Quorum Sensing: Biofilm Formation, Survival Behaviour and Antibiotic Resistance." In Implication of Quorum Sensing and Biofilm Formation in Medicine, Agriculture and Food Industry, 21–37. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9409-7_3.

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Sorvin, S. V., N. V. Rovnov, O. V. Rybalchenko, A. P. Zhukosky, and G. M. Chernyakov. "Study of the Structure and Behaviour of Bacterial Population Aqueous Suspensions." In Spectroscopy of Biological Molecules, 511. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0371-8_235.

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Lipka, G., and H. Hauser. "On the Phase Behaviour of Lipid X, a Precursor of Bacterial Lipopolysaccharides." In Surfactants in Solution, 185–96. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3836-3_13.

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Kropacheva, T. N., and A. J. Hoff. "The Oxidation Behaviour of Bacteriochlorophyll A in Purple Bacterial Reaction Centers and Antenna Complexes." In Photosynthesis: Mechanisms and Effects, 743–46. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3953-3_174.

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Armitage, Judith P., and Kathryn A. Scott. "Bacterial Behavior." In The Prokaryotes, 289–316. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-30123-0_53.

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Conference papers on the topic "Bacterial behaviour"

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Jonker, Catholijn M., Jacky L. Snoep, Jan Treur, Hans V. Westerhoff, and Wouter C. A. Wijngaards. "Embodied intentional dynamics of bacterial behaviour." In the first international joint conference. New York, New York, USA: ACM Press, 2002. http://dx.doi.org/10.1145/544741.544851.

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SMITH, HARRY. "QUESTIONS ABOUT THE BEHAVIOUR OF BACTERIAL PATHOGENS IN VIVO." In The Activities of Bacterial Pathogens in Vivo - Based on Contributions to a Royal Society Discussion Meeting. IMPERIAL COLLEGE PRESS, 2001. http://dx.doi.org/10.1142/9781848161610_0001.

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Nayak, Monalisha, Ayyappasamy Sudalaiyadum Perumal, Dan V. Nicolau, and Falco C. M. J. M. van Delft. "Bacterial motility behaviour in sub-ten micron wide geometries." In 2018 16th IEEE International New Circuits and Systems Conference (NEWCAS). IEEE, 2018. http://dx.doi.org/10.1109/newcas.2018.8585689.

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Caponetto, Riccardo, Giovanna di Pasquale, Salvatore Graziani, Emanuele Murgano, Antonino Pollicino, and Carlo Trigona. "Investigation of Bacterial Cellulose-based Fractional Order Element behaviour." In 2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2021. http://dx.doi.org/10.1109/i2mtc50364.2021.9459985.

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Vourc’h, Thomas, Julien Léopoldès, and Hassan Peerhossaini. "Phototactic Behaviour of Active Fluids: Effects of Light Perturbation on Diffusion Coefficient of Bacterial Suspensions." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4904.

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Abstract Active fluids refer to the fluids that contain self-propelled particles such as bacteria or micro-algae, whose properties differ fundamentally from the passive fluids. Such particles often exhibit an intermittent motion; with high-motility “run” periods separated by low-motility “tumble” periods. The average motion can be modified with external stresses, such as nutrient or light gradient, leading to a directed movement called chemotaxis and phototaxis, respectively. Using cyanobacterium Synechocystis sp.PCC 6803, a model micro-organism to study photosynthesis, we track the bacterial response to light stimuli, under isotropic and non-isotropic conditions. In particular, we investigate how the intermittent motility is influenced by illumination. We find that just after a rise in light intensity, the probability to be in the run state increases. This feature vanishes after a typical time of about 1 hour, when initial probability is recovered. Our results are well described by a model based on the linear response theory. When the perturbation is anisotropic, the characteristic time of runs is longer whatever the direction, similar to what is observed with isotropic conditions. Yet we observe a collective motion toward the light source (phototaxis) and show that the bias emerges because of more frequent runs towards the light.
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Zorzan, Irene. "Localized Spatial Emergent Behaviour in Bacterial Cells via Band-Detect Network Motif." In 2019 18th European Control Conference (ECC). IEEE, 2019. http://dx.doi.org/10.23919/ecc.2019.8795768.

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Steager, Edward, M. Selman Sakar, U. Kei Cheang, David Casale, Vijay Kumar, George J. Pappas, and Min Jun Kim. "Galvanotactic Control of Self-Powered Microstructures." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66647.

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We are examining microactuation techniques by employing the electrokinetic and galvanotactic behavior of certain bacteria. We cultured selected strains of swarming Serratia marcescens which were attached to microstructures using a blotting technique that creates a bacterial monolayer carpet. These bacterial carpets naturally self-coordinate to propel the microstructures. The microstructures were placed in an open channel and a voltage was applied and polarity was switched. We have demonstrated directional control of the motion of the microstructures patterned with bacteria. This mobility is due to the patterning of bacteria on the microstructure surface and arises from a combination of electrokinetic effects and galvanotaxis.
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Ziemen, M., M. Fierek, A. Francos, J. Si nn, and K. Breddin. "FIBRONECTIN, ANTITHROMBIN III, VON WILLEBRAND-FACTOR-ANTIGEN AND THROMBOCYTES DURING SEPTICEMIA, PNEUMONIA, SHOCK AND POLYTRAUMA." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644246.

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In 56 patients with septicemia (N=10), septic shock (N=10), cardiogenic shock (N=7), bacterial pneumonia (N=6) and polytraumatized patients (N=23) fibronectin, von Wi11ebrand-factor-anti gen (vWF:AG), fibrinogen, antithrombin III (AT III) and platelet count were measured during the first week of illness. Like fibronectin vWF:AG is synthesized in the endothelial cells and is a mediator for platelet adhesion. Decrease of AT III and platelet count are sensitive indicators if activation of haemostasisIn all patients with septic shock on the first day of illness fibronectin was decreased (12.9ଗ.2mg/dl; mean +standard deviation) as well as AI III (55넠%) and platelet count (129 000녶 000/mm ). All patients with bacterial pneumonia showed lowered fibronectin levels on Day 1 (12.2±8.5mg/dl), at the same time AT III and platelet counts were lowered in most of these patients. On the first day of septicemia or polytrauma a slight decrease of fibronectin, AT III and platelet counts were observed: the mean of each of these parameters was below the normal range. During cardiogenic shock fibronectin and platelet counts were normal in all patients. vWF:AG and fibrinogen were elevated in nearly all groups during follow up; 1 week after cardiogenic shock the mean of vWF:AG exceeded 400%In contrast to vWF:AG and fibrinogen there was obviously a similar behaviour of fibronectin, platelet count and antithrombin III, possibly as signs of activated haemostasis. vWF:AG and fibrinogen seem to react independently, no correlation was found between these parameters and fibronectin in severely ill patients
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Kim, Min Jun, and Kenneth S. Breuer. "Enhanced Diffusion Due to Swimming Bacteria." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55014.

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The effect of bacterial motion of the diffusion of a high molecular weight molecule is studied by observing the mixing of two streams of fluid in a micro-fabricated flow cell. The presence of Escherichia coli (E.coli) in one of the streams results in an increase in the effective diffusion coefficient of Dextran, which rises linearly with the concentration of bacteria from a baseline value of 2 × 10−7 cm2/s to 8 × 10−7 cm2/s at a concentration of 2.1 × 109 /ml (approximately 0.5 % by volume). The diffusion process is also observed to undergo a change from standard “Fickian” diffusion to a superdiffusive behavior in which the diffusion exponent rises from 0.5 to 0.55 as the concentration of bacteria rises from 0 to 2.1 × 109/ml.
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Liang, Xiaomeng, Lin-Ching Chang, Arash Massoudieh, Nanxi Lu, and Thanh H. Nguyen. "Quantitative Inference of Bacterial Motility Behavior." In 2015 International Conference on Computational Science and Computational Intelligence (CSCI). IEEE, 2015. http://dx.doi.org/10.1109/csci.2015.97.

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Reports on the topic "Bacterial behaviour"

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Irene Newton, Irene Newton. E pluribus unum: how honey bee bacteria coordinate behaviors. Experiment, January 2016. http://dx.doi.org/10.18258/6428.

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Dunifon, R. E., and T. C. Hazen. The effect of vacuum pump oil on the chemotactic behavior of soil bacteria. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6423307.

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Lopez de Victoria, G. Chemotactic behavior of deep subsurface bacteria toward carbohydrates, amino acids and a chlorinated alkene. Office of Scientific and Technical Information (OSTI), February 1989. http://dx.doi.org/10.2172/6324569.

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Delaire, Caroline. Improving Access to Safe Water in West Bengal, India: From Arsenic and Bacteria Removal to Household Behavior Change. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1481915.

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