TY - JOUR
T1 - Chemomodulation of cellular movement, collective formation of vortices by swarming bacteria, and colonial development
AU - Ben-Jacob, Eshel
AU - Cohen, Inon
AU - Czirók, András
AU - Vicsek, Tamás
AU - Gutnick, David L.
N1 - Funding Information:
The first isolationo f the ~F"m orphotypwea s done in collaboratiowni th O. Avidan, A. Dukler,O . Shocheat ndA. TenenbaumW. e thankE . Rom for providingu s with the B. subtilis 168 strain.W e thankR . Rudnerf or usefuld iscussionasn dher commentosn the manuscriptW. e are thankfutl o I. Brainis for her technicaal ssistanceT.h e research was supportedin part by a grantf rom the Israel USA binationaflo undationB SF 92-00051,a grantf romthe GermanIs raelf oundatioGn IF 090102a, grantf romThe Israeli Academyo f Science5 93-95a nd grantT 019299o f the HungarianS cienceF oundation (OTKA).
PY - 1997/4/15
Y1 - 1997/4/15
N2 - Bacterial colonies have developed sophisticated modes of cooperative behavior which enable them to respond to adverse growth conditions. It has been shown that such behavior can be manifested in formation of complex colonial patterns. Certain Bacillus species exhibit collective migration, "turbulent like" flow and emergence of whirlpools during colonial development. Here we present experimental observations of collective behavior and a generic model to explain such behavior. The model incorporates self-propelled and interacting "particles" (swarmers). We show that velocity interaction between the particles can lead to a synchronized movement. To explain vortices formation, we propose a plausible mechanism involving a special chemotactic response (rotational chemotaxis) which is based on speed modulations according to the concentration of a chemoattractant. This mechanism differs from that exhibited by swimming bacteria. We show that the chemomodulation of swarmers' speed together with the velocity interactions impose a torque on the collective motion and can lead to formation of vortices. The inclusion of both attractive and repulsive rotational chemotaxis in the model captures the salient features of the observed growth patterns.
AB - Bacterial colonies have developed sophisticated modes of cooperative behavior which enable them to respond to adverse growth conditions. It has been shown that such behavior can be manifested in formation of complex colonial patterns. Certain Bacillus species exhibit collective migration, "turbulent like" flow and emergence of whirlpools during colonial development. Here we present experimental observations of collective behavior and a generic model to explain such behavior. The model incorporates self-propelled and interacting "particles" (swarmers). We show that velocity interaction between the particles can lead to a synchronized movement. To explain vortices formation, we propose a plausible mechanism involving a special chemotactic response (rotational chemotaxis) which is based on speed modulations according to the concentration of a chemoattractant. This mechanism differs from that exhibited by swimming bacteria. We show that the chemomodulation of swarmers' speed together with the velocity interactions impose a torque on the collective motion and can lead to formation of vortices. The inclusion of both attractive and repulsive rotational chemotaxis in the model captures the salient features of the observed growth patterns.
UR - http://www.scopus.com/inward/record.url?scp=0031118285&partnerID=8YFLogxK
U2 - 10.1016/S0378-4371(96)00457-8
DO - 10.1016/S0378-4371(96)00457-8
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AN - SCOPUS:0031118285
SN - 0378-4371
VL - 238
SP - 181
EP - 197
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
IS - 1-4
ER -