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Transient Pattern Formation in Biological Systems
Transient Pattern Formation in Biological Systems
Transient Pattern Formation in Biological Systems

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103123
ISBN  
9798280710030
DDC  
574.191
저자명  
Pan, Deng.
서명/저자  
Transient Pattern Formation in Biological Systems
발행사항  
[Sl] : Harvard University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
138 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Amir, Ariel.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2025.
초록/해제  
요약This dissertation investigates transient pattern formation in biological systems through a combination of theoretical modeling, stochastic analysis, and simulation. Biological processes are often driven by local interactions and feedback mechanisms that give rise to complex, time-dependent patterns. Given the inherent heterogeneity and noise in living systems, traditional deterministic models are often insufficient to capture the full spectrum of behaviors observed in nature. Here, I develop and analyze different models that are robust to microscopic details while capturing essential dynamical features.One focus of this dissertation is the study of reaction-diffusion phenomena in immune cell signaling. I investigate how neutrophils generate self-regulating, transient chemical waves that coordinate a rapid yet contained response to injury or infection. The models show that the interplay between activators and locally produced inhibitors can naturally limit the spatial extent of these signaling waves, providing a mechanistic basis for preventing overreaction in immune responses.Further, I examine the role of mechanical stress in flow-driven pattern formation within porous media. By representing these media as dynamic networks in which individual conduits adapt through erosion and deposition, I identify critical thresholds that lead to distinct phase behaviors, such as channelization and homogenization. This work not only elucidates the feedback between fluid flow and structural evolution but also offers a simple approach to analyze complex networks.By applying a similar strategy to biological networks, I explore the emergence of optimized biological flow networks. By integrating local mechanical sensing into growth dynamics, I derive conditions under which vascular systems naturally converge toward configurations predicted by Murray's law-a hallmark of energy-efficient design observed in blood vessels, leaf venation, and even in the foraging networks of slime molds.Finally, I extend the classical mutation models, exemplified by the Luria-Delbruck experiment, to regimes where the effective mutation rate is significantly higher through modern gene-editing techniques. By formulating discrete stochastic models, I reveal novel phase transitions in DNA break-and-repair dynamics and demonstrate how randomness in molecular events influences cell fate and population heterogeneity.
일반주제명  
Biophysics
일반주제명  
Molecular biology
일반주제명  
Immunology
키워드  
Immune responses
키워드  
Immune cell signaling
키워드  
Stochastic analysis
기타저자  
Harvard University Engineering and Applied Sciences - Applied Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798280710030
■035    ▼a(MiAaPQ)AAI31938477
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574.191
■1001  ▼aPan,  Deng.▼0(orcid)0000-0002-4597-6942
■24510▼aTransient  Pattern  Formation  in  Biological  Systems
■260    ▼a[Sl]▼bHarvard  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a138  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Amir,  Ariel.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2025.
■520    ▼aThis  dissertation  investigates  transient  pattern  formation  in  biological  systems  through  a  combination  of  theoretical  modeling,  stochastic  analysis,  and  simulation.  Biological  processes  are  often  driven  by  local  interactions  and  feedback  mechanisms  that  give  rise  to  complex,  time-dependent  patterns.  Given  the  inherent  heterogeneity  and  noise  in  living  systems,  traditional  deterministic  models  are  often  insufficient  to  capture  the  full  spectrum  of  behaviors  observed  in  nature.  Here,  I  develop  and  analyze  different  models  that  are  robust  to  microscopic  details  while  capturing  essential  dynamical  features.One  focus  of  this  dissertation  is  the  study  of  reaction-diffusion  phenomena  in  immune  cell  signaling.  I  investigate  how  neutrophils  generate  self-regulating,  transient  chemical  waves  that  coordinate  a  rapid  yet  contained  response  to  injury  or  infection.  The  models  show  that  the  interplay  between  activators  and  locally  produced  inhibitors  can  naturally  limit  the  spatial  extent  of  these  signaling  waves,  providing  a  mechanistic  basis  for  preventing  overreaction  in  immune  responses.Further,  I  examine  the  role  of  mechanical  stress  in  flow-driven  pattern  formation  within  porous  media.  By  representing  these  media  as  dynamic  networks  in  which  individual  conduits  adapt  through  erosion  and  deposition,  I  identify  critical  thresholds  that  lead  to  distinct  phase  behaviors,  such  as  channelization  and  homogenization.  This  work  not  only  elucidates  the  feedback  between  fluid  flow  and  structural  evolution  but  also  offers  a  simple  approach  to  analyze  complex  networks.By  applying  a  similar  strategy  to  biological  networks,  I  explore  the  emergence  of  optimized  biological  flow  networks.  By  integrating  local  mechanical  sensing  into  growth  dynamics,  I  derive  conditions  under  which  vascular  systems  naturally  converge  toward  configurations  predicted  by  Murray's  law-a  hallmark  of  energy-efficient  design  observed  in  blood  vessels,  leaf  venation,  and  even  in  the  foraging  networks  of  slime  molds.Finally,  I  extend  the  classical  mutation  models,  exemplified  by  the  Luria-Delbruck  experiment,  to  regimes  where  the  effective  mutation  rate  is  significantly  higher  through  modern  gene-editing  techniques.  By  formulating  discrete  stochastic  models,  I  reveal  novel  phase  transitions  in  DNA  break-and-repair  dynamics  and  demonstrate  how  randomness  in  molecular  events  influences  cell  fate  and  population  heterogeneity.
■590    ▼aSchool  code:  0084.
■650  4▼aBiophysics
■650  4▼aMolecular  biology
■650  4▼aImmunology
■653    ▼aImmune  responses
■653    ▼aImmune  cell  signaling
■653    ▼aStochastic  analysis
■690    ▼a0786
■690    ▼a0982
■690    ▼a0307
■71020▼aHarvard  University▼bEngineering  and  Applied  Sciences  -  Applied  Physics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357054▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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