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Analytical and Computational Approaches to Nonlinear Dynamics in Enzyme Kinetics and Sleep-Wake Regulation
Analytical and Computational Approaches to Nonlinear Dynamics in Enzyme Kinetics and Sleep...
Analytical and Computational Approaches to Nonlinear Dynamics in Enzyme Kinetics and Sleep-Wake Regulation

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자료유형  
 학위논문 서양
최종처리일시  
20260202105224
ISBN  
9798291566428
DDC  
574
저자명  
Srivastava, Kashvi.
서명/저자  
Analytical and Computational Approaches to Nonlinear Dynamics in Enzyme Kinetics and Sleep-Wake Regulation
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
240 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Booth, Victoria;Schnell, Santiago.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약Reduced models for enzymatic mechanisms, widely used in real-world biochemical applications, are often governed by parametric restrictions that determine their accuracy and applicability. The work in this thesis focuses on addressing challenges in analyzing solutions of reduced enzyme kinetic models, particularly in settings where assumptions of traditional analytic methods may fail. A second focus of this thesis is the development of a gradient-based optimization framework for fitting noisy differential equation models for the neuronal regulation of sleep-wake behavior to biological data.In Chapter 2, we derive slow-scale linear noise approximation (ssLNA) to stochastic enzyme kinetic models directly using geometric singular perturbation theory (GSPT). We resolve discrepancies among prior stochastic reductions by identifying the role of the Tikhonov standard form in producing consistent reductions. Extending the ssLNA to systems with a transcritical bifurcation, we disprove the widely-used Segel-Slemrod condition for stochastic model reduction in the Michaelis-Menten (MM) mechanism. Instead, we demonstrate that the more restrictive Reich-Sel'kov condition is needed, aligning stochastic and deterministic validity thresholds for quasi-steady-state approximations (QSSAs).In Chapter 3, we focus on the MM model to investigate the parametric conditions under which the standard QSSA is not only valid but also predominant among competing reductions. Using the theory of fences and anti-funnels, we locate the slow manifold in the MM phase plane and derive sharp error bounds. While the Reich-Sel'kov condition governs accuracy, we introduce a new and more restrictive qualifier that predicts the predominance of the standard QSSA. This distinction is critical when multiple reduced models are valid, as it guides optimal model selection for experimental design.In Chapter 4, we perform model reduction analysis for the Intermolecular Autocatalytic Zymogen Activation (IAZA) model, when it features a dynamic transcritical bifurcation. GSPT fails in this setting due to loss of normal hyperbolicity. Using the blow-up method, we transform the system near the bifurcation to recover hyperbolicity and derive an explicit solution to the desingularized system at the bifurcation point. This allows us to estimate the peak complex concentration analytically and explain the surprising accuracy of the nullcline-based reduction. We also identify the existence of a canard and analyze the implications of dynamic imperfections for model reduction.Chapter 5 tackles perturbation systems that lack an explicit Tikhonov standard form structure but mimic typical standard form behavior portraying fast convergence to QSS approximations. We propose a novel use of the blow-up method to connect the fast and slow dynamics in systems where a clear distinction is not apparent. Applied to the MM and IAZA systems, this approach reveals that the systems admit latent standard fast-slow structure and the trajectories starting both on and away from the critical manifold get attracted to the QSS curves, validating the resemblance to standard form dynamics.Chapter 6 shifts focus to computational neuroscience and presents a framework for fitting noisy differential equation models to rodent sleep-wake data using gradient-based optimization. We adapt a mechanistic model of interacting neuronal populations with noisy firing activity. Leveraging automatic differentiation, maximum mean discrepancy, and sensitivity analysis, we demonstrate efficient parameter inference from discrete sleep score data. The methodology offers a framework to relate experimental hypotheses for the neuronal circuit structures responsible for sleep-wake regulation to the random polyphasic sleep-wake behavior of rodents, with applications in and beyond sleep modeling.
일반주제명  
Biology
일반주제명  
Mathematics
일반주제명  
Applied mathematics
일반주제명  
Biochemistry
키워드  
Mathematical biology
키워드  
Geometric singular perturbation theory
키워드  
Quasi-steady-state approximations
키워드  
Sleep-wake regulation
키워드  
Gradient-based optimization
키워드  
Ordinary differential equation
기타저자  
University of Michigan Applied and Interdisciplinary Mathematics
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aSrivastava,  Kashvi.
■24510▼aAnalytical  and  Computational  Approaches  to  Nonlinear  Dynamics  in  Enzyme  Kinetics  and  Sleep-Wake  Regulation
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a240  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Booth,  Victoria;Schnell,  Santiago.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aReduced  models  for  enzymatic  mechanisms,  widely  used  in  real-world  biochemical  applications,  are  often  governed  by  parametric  restrictions  that  determine  their  accuracy  and  applicability.  The  work  in  this  thesis  focuses  on  addressing  challenges  in  analyzing  solutions  of  reduced  enzyme  kinetic  models,  particularly  in  settings  where  assumptions  of  traditional  analytic  methods  may  fail.  A  second  focus  of  this  thesis  is  the  development  of  a  gradient-based  optimization  framework  for  fitting  noisy  differential  equation  models  for  the  neuronal  regulation  of  sleep-wake  behavior  to  biological  data.In  Chapter  2,  we  derive  slow-scale  linear  noise  approximation  (ssLNA)  to  stochastic  enzyme  kinetic  models  directly  using  geometric  singular  perturbation  theory  (GSPT).  We  resolve  discrepancies  among  prior  stochastic  reductions  by  identifying  the  role  of  the  Tikhonov  standard  form  in  producing  consistent  reductions.  Extending  the  ssLNA  to  systems  with  a  transcritical  bifurcation,  we  disprove  the  widely-used  Segel-Slemrod  condition  for  stochastic  model  reduction  in  the  Michaelis-Menten  (MM)  mechanism.  Instead,  we  demonstrate  that  the  more  restrictive  Reich-Sel'kov  condition  is  needed,  aligning  stochastic  and  deterministic  validity  thresholds  for  quasi-steady-state  approximations  (QSSAs).In  Chapter  3,  we  focus  on  the  MM  model  to  investigate  the  parametric  conditions  under  which  the  standard  QSSA  is  not  only  valid  but  also  predominant  among  competing  reductions.  Using  the  theory  of  fences  and  anti-funnels,  we  locate  the  slow  manifold  in  the  MM  phase  plane  and  derive  sharp  error  bounds.  While  the  Reich-Sel'kov  condition  governs  accuracy,  we  introduce  a  new  and  more  restrictive  qualifier  that  predicts  the  predominance  of  the  standard  QSSA.  This  distinction  is  critical  when  multiple  reduced  models  are  valid,  as  it  guides  optimal  model  selection  for  experimental  design.In  Chapter  4,  we  perform  model  reduction  analysis  for  the  Intermolecular  Autocatalytic  Zymogen  Activation  (IAZA)  model,  when  it  features  a  dynamic  transcritical  bifurcation.  GSPT  fails  in  this  setting  due  to  loss  of  normal  hyperbolicity.  Using  the  blow-up  method,  we  transform  the  system  near  the  bifurcation  to  recover  hyperbolicity  and  derive  an  explicit  solution  to  the  desingularized  system  at  the  bifurcation  point.  This  allows  us  to  estimate  the  peak  complex  concentration  analytically  and  explain  the  surprising  accuracy  of  the  nullcline-based  reduction.  We  also  identify  the  existence  of  a  canard  and  analyze  the  implications  of  dynamic  imperfections  for  model  reduction.Chapter  5  tackles  perturbation  systems  that  lack  an  explicit  Tikhonov  standard  form  structure  but  mimic  typical  standard  form  behavior  portraying  fast  convergence  to  QSS  approximations.  We  propose  a  novel  use  of  the  blow-up  method  to  connect  the  fast  and  slow  dynamics  in  systems  where  a  clear  distinction  is  not  apparent.  Applied  to  the  MM  and  IAZA  systems,  this  approach  reveals  that  the  systems  admit  latent  standard  fast-slow  structure  and  the  trajectories  starting  both  on  and  away  from  the  critical  manifold  get  attracted  to  the  QSS  curves,  validating  the  resemblance  to  standard  form  dynamics.Chapter  6  shifts  focus  to  computational  neuroscience  and  presents  a  framework  for  fitting  noisy  differential  equation  models  to  rodent  sleep-wake  data  using  gradient-based  optimization.  We  adapt  a  mechanistic  model  of  interacting  neuronal  populations  with  noisy  firing  activity.  Leveraging  automatic  differentiation,  maximum  mean  discrepancy,  and  sensitivity  analysis,  we  demonstrate  efficient  parameter  inference  from  discrete  sleep  score  data.  The  methodology  offers  a  framework  to  relate  experimental  hypotheses  for  the  neuronal  circuit  structures  responsible  for  sleep-wake  regulation  to  the  random  polyphasic  sleep-wake  behavior  of  rodents,  with  applications  in  and  beyond  sleep  modeling.
■590    ▼aSchool  code:  0127.
■650  4▼aBiology
■650  4▼aMathematics
■650  4▼aApplied  mathematics
■650  4▼aBiochemistry
■653    ▼aMathematical  biology
■653    ▼aGeometric  singular  perturbation  theory
■653    ▼aQuasi-steady-state  approximations
■653    ▼aSleep-wake  regulation
■653    ▼aGradient-based  optimization
■653    ▼aOrdinary  differential  equation
■690    ▼a0364
■690    ▼a0405
■690    ▼a0306
■690    ▼a0487
■71020▼aUniversity  of  Michigan▼bApplied  and  Interdisciplinary  Mathematics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359846▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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