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Applying Methods From Dynamical Systems to Topics at the Intersection of Statistical Mechanics and Biology
Applying Methods From Dynamical Systems to Topics at the Intersection of Statistical Mecha...
Applying Methods From Dynamical Systems to Topics at the Intersection of Statistical Mechanics and Biology

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202104700
ISBN  
9798280776623
DDC  
530
저자명  
O'Day Barkan, Casey Michael.
서명/저자  
Applying Methods From Dynamical Systems to Topics at the Intersection of Statistical Mechanics and Biology
발행사항  
[Sl] : University of California, Los Angeles, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
271 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Bruinsma, Robijn F.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2025.
초록/해제  
요약The dynamics and behaviors of a variety of biological systems across a range of scales are investigated using tools from statistical mechanics and dynamical systems theory. Part I studies proteins that form catch bonds, bonds that strengthen when stretched by a force, which play crucial roles in the immune system. A theory of catch bonding is developed, which shows how the force-induced deformations of a protein-ligand bond can cause the bond's mean lifetime to switch between increasing and decreasing as the applied force is increased. This theory is then applied to a model of selectin-ligand bonds to show how the mechanics of the bond can give rise to triphasic catch bonding, a phenomenon found in experiments and not previously understood theoretically. Part II studies the dynamics of interacting cell populations. First, the effects of migration on the evolution of populations in spatially structured habitats is investigated. It is found that certain migration patterns can stabilize the coexistence of similar strains, and changes in migration pattern can induce both continuous and discontinuous critical transitions in the system's steady state population. Second, a framework for modeling coordinated tissue development is developed and applied to examples inspired by stem cell differentiation and by planaria worms that reproduce via fission. A unifying theme in Parts I and II is the use of bifurcation theory to understand systems' behaviors. Part III examines thermalization, the process by which systems of many particles approach thermodynamic equilibrium. The proper way to understand thermalization has long been a subject of debate, and in part III I build upon one approach for understanding thermalization. I define a generalization of a coarse-graining procedure often used to describe the convergence of phase space distributions to microcanonical equilibrium, and I prove that under this generalized coarse-graining, statistical ensembles dynamically converge to equilibrium when the dynamics have a common property called strong mixing.
일반주제명  
Physics
일반주제명  
Biophysics
일반주제명  
Biology
키워드  
Catch bond
키워드  
Evolutionary dynamics
키워드  
Statistical mechanics
키워드  
Tissue development
키워드  
Dynamical systems theory
기타저자  
University of California, Los Angeles Physics 0666
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI32116090
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aO'Day  Barkan,  Casey  Michael.
■24510▼aApplying  Methods  From  Dynamical  Systems  to  Topics  at  the  Intersection  of  Statistical  Mechanics  and  Biology
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a271  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Bruinsma,  Robijn  F.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2025.
■520    ▼aThe  dynamics  and  behaviors  of  a  variety  of  biological  systems  across  a  range  of  scales  are  investigated  using  tools  from  statistical  mechanics  and  dynamical  systems  theory.  Part  I  studies  proteins  that  form  catch  bonds,  bonds  that  strengthen  when  stretched  by  a  force,  which  play  crucial  roles  in  the  immune  system.  A  theory  of  catch  bonding  is  developed,  which  shows  how  the  force-induced  deformations  of  a  protein-ligand  bond  can  cause  the  bond's  mean  lifetime  to  switch  between  increasing  and  decreasing  as  the  applied  force  is  increased.  This  theory  is  then  applied  to  a  model  of  selectin-ligand  bonds  to  show  how  the  mechanics  of  the  bond  can  give  rise  to  triphasic  catch  bonding,  a  phenomenon  found  in  experiments  and  not  previously  understood  theoretically.  Part  II  studies  the  dynamics  of  interacting  cell  populations.  First,  the  effects  of  migration  on  the  evolution  of  populations  in  spatially  structured  habitats  is  investigated.  It  is  found  that  certain  migration  patterns  can  stabilize  the  coexistence  of  similar  strains,  and  changes  in  migration  pattern  can  induce  both  continuous  and  discontinuous  critical  transitions  in  the  system's  steady  state  population.  Second,  a  framework  for  modeling  coordinated  tissue  development  is  developed  and  applied  to  examples  inspired  by  stem  cell  differentiation  and  by  planaria  worms  that  reproduce  via  fission.  A  unifying  theme  in  Parts  I  and  II  is  the  use  of  bifurcation  theory  to  understand  systems'  behaviors.  Part  III  examines  thermalization,  the  process  by  which  systems  of  many  particles  approach  thermodynamic  equilibrium.  The  proper  way  to  understand  thermalization  has  long  been  a  subject  of  debate,  and  in  part  III  I  build  upon  one  approach  for  understanding  thermalization.  I  define  a  generalization  of  a  coarse-graining  procedure  often  used  to  describe  the  convergence  of  phase  space  distributions  to  microcanonical  equilibrium,  and  I  prove  that  under  this  generalized  coarse-graining,  statistical  ensembles  dynamically  converge  to  equilibrium  when  the  dynamics  have  a  common  property  called  strong  mixing.
■590    ▼aSchool  code:  0031.
■650  4▼aPhysics
■650  4▼aBiophysics
■650  4▼aBiology
■653    ▼aCatch  bond
■653    ▼aEvolutionary  dynamics
■653    ▼aStatistical  mechanics
■653    ▼aTissue  development
■653    ▼aDynamical  systems  theory
■690    ▼a0605
■690    ▼a0786
■690    ▼a0306
■71020▼aUniversity  of  California,  Los  Angeles▼bPhysics  0666.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358422▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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