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Mechanics and Energetics of Cytoskeletal Assembly
Mechanics and Energetics of Cytoskeletal Assembly
Mechanics and Energetics of Cytoskeletal Assembly

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103035
ISBN  
9798286445080
DDC  
530
저자명  
Sun, Zachary Gao.
서명/저자  
Mechanics and Energetics of Cytoskeletal Assembly
발행사항  
[Sl] : Yale University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
246 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Murrell, Michael P.
학위논문주기  
Thesis (Ph.D.)--Yale University, 2025.
초록/해제  
요약Active matter is a subfield of soft condensed matter physics that focuses on the emergence of collective phenomena, as components of the system consume energy, driving them out of thermodynamic equilibrium. Living matter, a specific subfield of active matter, lies between physics and biology. In this case, the components are biomolecules, whose interactions are not only constrained by the laws of physics but may exhibit purpose and intentionality. Biophysicists, who study living matter use reductionist approaches and focus on how different components of the system can collectively give rise to novel biological phenomena through continuous consumption of energy.An example of a driven, non-equilibrium thermodynamic system is the cell cytoskeleton, which is an exquisite machinery that is responsible for complex tasks such as migration and division. It is composed of proteins and other biological macromolecules which interact to yield collective behaviors. For example, the protein scaffolding of the cell (F-actin) undergoes dramatic changes in structure, organization, and dynamics through impartation of mechanical stresses by molecular motors (myosin) which consume chemical energy during these morphological changes. However, how the consumption of chemical energy drives the mechanical performance of biological, protein-based machines is unknown. By using cutting edge biophysical experimental techniques and tools such as confocal microscopy, (micro)rheology, and pico-calorimetry, this thesis examines phenomena across scales from molecular level energetic consumption and dissipation to large micrometer-level collective and critical phenomena. We use the bottom-up approach and assemble the biomimetic cytoskeletal structure, the actomyosin network, using minimalistic purified protein components (in vitro).In this thesis, I will summarize several aspects related to the active mechanics and energetics of the cytoskeletal assembly such as how material properties relate to chemical consumption and vice versa. In doing so, I will describe unique aspects of non-equilibrium materials, including active stress propagation, energy consumption and dissipation, self-tuned critical behaviors, novel constitutive relationships, emergence of spatiotemporal instabilities (in vitro actin waves), and the change in heat dissipation and energetic efficiency.From these findings, we offer novel insights on the cytoskeleton as an auto-feedback network system that uses mechanochemical and biomechanical cues to regulate mechanical information propagation as well as the bioenergetic properties of the cytoskeleton as a crucial part of the machinery. We challenge the current understanding of the cytoskeleton field from a more network-focused perspective and motivate the investigation of how a cell regulates its energetic efficiency as an out-of-equilibrium thermodynamical machine.
일반주제명  
Physics
일반주제명  
Biophysics
일반주제명  
Thermodynamics
일반주제명  
Molecular biology
키워드  
Active matter
키워드  
Complex systems
키워드  
Living matter
키워드  
Rheology
키워드  
Self-organized criticality
기타저자  
Yale University Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aSun,  Zachary  Gao.
■24510▼aMechanics  and  Energetics  of  Cytoskeletal  Assembly
■260    ▼a[Sl]▼bYale  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a246  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Murrell,  Michael  P.
■5021  ▼aThesis  (Ph.D.)--Yale  University,  2025.
■520    ▼aActive  matter  is  a  subfield  of  soft  condensed  matter  physics  that  focuses  on  the  emergence  of  collective  phenomena,  as  components  of  the  system  consume  energy,  driving  them  out  of  thermodynamic  equilibrium.  Living  matter,  a  specific  subfield  of  active  matter,  lies  between  physics  and  biology.  In  this  case,  the  components  are  biomolecules,  whose  interactions  are  not  only  constrained  by  the  laws  of  physics  but  may  exhibit  purpose  and  intentionality.  Biophysicists,  who  study  living  matter  use  reductionist  approaches  and  focus  on  how  different  components  of  the  system  can  collectively  give  rise  to  novel  biological  phenomena  through  continuous  consumption  of  energy.An  example  of  a  driven,  non-equilibrium  thermodynamic  system  is  the  cell  cytoskeleton,  which  is  an  exquisite  machinery  that  is  responsible  for  complex  tasks  such  as  migration  and  division.  It  is  composed  of  proteins  and  other  biological  macromolecules  which  interact  to  yield  collective  behaviors.  For  example,  the  protein  scaffolding  of  the  cell  (F-actin)  undergoes  dramatic  changes  in  structure,  organization,  and  dynamics  through  impartation  of  mechanical  stresses  by  molecular  motors  (myosin)  which  consume  chemical  energy  during  these  morphological  changes.  However,  how  the  consumption  of  chemical  energy  drives  the  mechanical  performance  of  biological,  protein-based  machines  is  unknown.  By  using  cutting  edge  biophysical  experimental  techniques  and  tools  such  as  confocal  microscopy,  (micro)rheology,  and  pico-calorimetry,  this  thesis  examines  phenomena  across  scales  from  molecular  level  energetic  consumption  and  dissipation  to  large  micrometer-level  collective  and  critical  phenomena.  We  use  the  bottom-up  approach  and  assemble  the  biomimetic  cytoskeletal  structure,  the  actomyosin  network,  using  minimalistic  purified  protein  components  (in  vitro).In  this  thesis,  I  will  summarize  several  aspects  related  to  the  active  mechanics  and  energetics  of  the  cytoskeletal  assembly  such  as  how  material  properties  relate  to  chemical  consumption  and  vice  versa.  In  doing  so,  I  will  describe  unique  aspects  of  non-equilibrium  materials,  including  active  stress  propagation,  energy  consumption  and  dissipation,  self-tuned  critical  behaviors,  novel constitutive  relationships,  emergence  of  spatiotemporal  instabilities  (in  vitro  actin  waves),  and  the  change  in  heat  dissipation  and  energetic  efficiency.From  these  findings,  we  offer  novel  insights  on  the  cytoskeleton  as  an  auto-feedback  network  system  that  uses  mechanochemical  and  biomechanical  cues  to  regulate  mechanical  information  propagation  as  well  as  the  bioenergetic  properties  of  the  cytoskeleton  as  a  crucial  part  of  the  machinery.  We  challenge  the  current  understanding  of  the  cytoskeleton  field  from  a  more  network-focused  perspective  and  motivate  the  investigation  of  how  a  cell  regulates  its  energetic  efficiency  as  an  out-of-equilibrium  thermodynamical  machine.
■590    ▼aSchool  code:  0265.
■650  4▼aPhysics
■650  4▼aBiophysics
■650  4▼aThermodynamics
■650  4▼aMolecular  biology
■653    ▼aActive  matter
■653    ▼aComplex  systems
■653    ▼aLiving  matter
■653    ▼aRheology
■653    ▼aSelf-organized  criticality
■690    ▼a0605
■690    ▼a0786
■690    ▼a0348
■690    ▼a0307
■71020▼aYale  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0265
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356789▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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