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Dynamics of the Artificial Axon
Dynamics of the Artificial Axon
Dynamics of the Artificial Axon

Detailed Information

Material Type  
 단행본
 
0017160607
Date and Time of Latest Transaction  
20250211151048
ISBN  
9798381968309
DDC  
574.191
Author  
Pi, Ziqi.
Title/Author  
Dynamics of the Artificial Axon
Publish Info  
[Sl] : University of California, Los Angeles, 2024
Publish Info  
Ann Arbor : ProQuest Dissertations & Theses, 2024
Material Info  
140 p
General Note  
Source: Dissertations Abstracts International, Volume: 85-09, Section: B.
General Note  
Advisor: Zocchi, Giovanni.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
Abstracts/Etc  
요약The "Artificial Axon" (AA) is a synthetic excitable system developed in the Zocchi lab, constructed with the minimal biological components. Based on traditional black lipid membrane setups, the AA is the first cell-free platform capable of producing action potentials (APs) in time. This dissertation details the results of my work with the AA, using the voltage gated potassium channel KvAP as the active ingredient. First, I report on experimental measurements with the AA near the threshold for firing APs, a critical point of the system. In particular, a delay in firing occurs due to the presence of a saddle node bifurcation, and a scaling exponent for this delay is measured. Supplemented by numerical results, I show that this behavior near the critical point has correspondence to the real neuron, due to the universal nature of the dynamics near a critical point. Next, I will characterize the AA in terms of its phenomenology. Using a minimal 3D model based on the Hodgkin-Huxley model, I construct a qualitative phase diagram in the parameter space of the system. The existence of limit cycle regions in this phase diagram indicates that the AA is capable of generating self sustaining AP trains with just a single ion channel. The analysis also shows that the AA, having just one channel species with inactivation, possesses all the same dynamics as a two ion species system without inactivation, such as the Morris-Lecar model for the muscle fiber of the giant barnacle. This result is followed by measurements of the effective inactivation and recovery rates for our minimal model, qualitatively placing the AA with KvAP on the phase diagram. Finally, I will present work on an experimental system consisting of two AA connected by electronic "synapses", and explore the feasibility of constructing an autonomous oscillator with such a configuration. The connection of two AAs serves as a first step for our long term goal of AA based networks. The dissertation concludes with a short discussion on future directions for the Artificial Axon system. 
Subject Added Entry-Topical Term  
Biophysics
Subject Added Entry-Topical Term  
Condensed matter physics
Subject Added Entry-Topical Term  
Physics
Index Term-Uncontrolled  
Action potential
Index Term-Uncontrolled  
Artificial Axon system
Index Term-Uncontrolled  
Dynamics
Index Term-Uncontrolled  
Synthetic biology
Index Term-Uncontrolled  
Morris-Lecar model
Added Entry-Corporate Name  
University of California, Los Angeles Physics 0666
Host Item Entry  
Dissertations Abstracts International. 85-09B.
Electronic Location and Access  
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■020    ▼a9798381968309
■035    ▼a(MiAaPQ)AAI31141031
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574.191
■1001  ▼aPi,  Ziqi.
■24510▼aDynamics  of  the  Artificial  Axon
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a140  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-09,  Section:  B.
■500    ▼aAdvisor:  Zocchi,  Giovanni.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aThe  "Artificial  Axon"  (AA)  is  a  synthetic  excitable  system  developed  in  the  Zocchi  lab,  constructed  with  the  minimal  biological  components.  Based  on  traditional  black  lipid  membrane  setups,  the  AA  is  the  first  cell-free  platform  capable  of  producing  action  potentials  (APs)  in  time.  This  dissertation  details  the  results  of  my  work  with  the  AA,  using  the  voltage  gated  potassium  channel  KvAP  as  the  active  ingredient.  First,  I  report  on  experimental  measurements  with  the  AA  near  the  threshold  for  firing  APs,  a  critical  point  of  the  system.  In  particular,  a  delay  in  firing  occurs  due  to  the  presence  of  a  saddle  node  bifurcation,  and  a  scaling  exponent  for  this  delay  is  measured.  Supplemented  by  numerical  results,  I  show  that  this  behavior  near  the  critical  point  has  correspondence  to  the  real  neuron,  due  to  the  universal  nature  of  the  dynamics  near  a  critical  point.  Next,  I  will  characterize  the  AA  in  terms  of  its  phenomenology.  Using  a  minimal  3D  model  based  on  the  Hodgkin-Huxley  model,  I  construct  a  qualitative  phase  diagram  in  the  parameter  space  of  the  system.  The  existence  of  limit  cycle  regions  in  this  phase  diagram  indicates  that  the  AA  is  capable  of  generating  self  sustaining  AP  trains  with  just  a  single  ion  channel.  The  analysis  also  shows  that  the  AA,  having  just  one  channel  species  with  inactivation,  possesses  all  the  same  dynamics  as  a  two  ion  species  system  without  inactivation,  such  as  the  Morris-Lecar  model  for  the  muscle  fiber  of  the  giant  barnacle.  This  result  is  followed  by  measurements  of  the  effective  inactivation  and  recovery  rates  for  our  minimal  model,  qualitatively  placing  the  AA  with  KvAP  on  the  phase  diagram.  Finally,  I  will  present  work  on  an  experimental  system  consisting  of  two  AA  connected  by  electronic  "synapses",  and  explore  the  feasibility  of  constructing  an  autonomous  oscillator  with  such  a  configuration.  The  connection  of  two  AAs  serves  as  a  first  step  for  our  long  term  goal  of  AA  based  networks.  The  dissertation  concludes  with  a  short  discussion  on  future  directions  for  the  Artificial  Axon  system. 
■590    ▼aSchool  code:  0031.
■650  4▼aBiophysics
■650  4▼aCondensed  matter  physics
■650  4▼aPhysics
■653    ▼aAction  potential
■653    ▼aArtificial  Axon  system
■653    ▼aDynamics
■653    ▼aSynthetic  biology
■653    ▼aMorris-Lecar  model
■690    ▼a0786
■690    ▼a0611
■690    ▼a0605
■71020▼aUniversity  of  California,  Los  Angeles▼bPhysics  0666.
■7730  ▼tDissertations  Abstracts  International▼g85-09B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160607▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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