Library · Biology & lab methods
What In Vivo Microdialysis & Ex Vivo Probing got wrong, from 13 theses
Summary written by a model from the records below: Microdialysis and ex vivo probing methods frequently encounter physical limitations including probe-induced tissue trauma, diffusion barriers, and severe extraction losses for large molecules. Additionally, ex vivo tissue specimens suffer from rapid ischemic decay and structural changes that hinder accurate correlation with in vivo physiological states. These records come from graduate theses, 2021 to 2026, each labeled with its degree where the repository states it, and each links to its thesis. They were extracted by language models reading the full text, so treat each as a lead to read, not a verdict.
Plus 7 problems the authors left open, listed at the end.
Failure modes, by theses reporting them
Select a mode to jump to its records.
Transport limitations and probe instability impair reverse microdialysis delivery
Reverse microdialysis and retrodialysis setups suffered from diffusion limits, steep concentration gradients, and probe membrane adsorption that prevented detectable substrate delivery or metabolic shifts. In addition, physical inconsistencies in probe spacing and membrane flaring caused irreproducible mass transport measurements.
Tried and failed
microdialysis delivery of stable isotope labeled substrate applied to cerebral energy metabolism monitoring. Outcome: no signal. Reason: supplemented labeled glucose yielded no detectable downstream labeling or metabolic shifts in extracellular fluid
Understanding and ameliorating perturbations of human cerebral energy metabolism after major trauma · Cambridge · PhD
Considered and rejected
Considered and rejected: Single-catheter reverse micro-dialysis was rejected for drug delivery due to immediate equilibrium, steep concentration gradients, and inability to overcome molecular weight diffusion discrepancies.
Microdialysis, microperfusion and convection current-guided distribution of solutes in a brain phantom · Boston University · Master's
Tried and failed
retrodialysis delivery in stationary solutions applied to enzyme activity quantification. Outcome: no signal. Reason: diffusion limitations, local substrate depletion, and background drift from enzyme adsorption to the probe membrane
Development of a microfluidic biosensing system for real-time monitoring of acetylcholinesterase activity · Imperial · PhD
Tried and failed
dual flexible microdialysis probe coupling applied to continuous biosensing and retrodialysis sampling. Outcome: unstable. Reason: inconsistent inter-probe spacing and membrane flaring caused irreproducible mass transport measurements
Development of a microfluidic biosensing system for real-time monitoring of acetylcholinesterase activity · Imperial · PhD
Ex vivo tissue probing suffers from loss of native structure and poor concordance with in vivo physiology
Ex vivo tissue models experienced loss of native anatomical geometry and extreme tissue fragility during mechanical probing. Fluorescent probes failed to yield reliable detection in dissected tissue, and dynamic physiological measurements did not correlate with static post-mortem histological staining.
Considered and rejected
Considered and rejected: Rejected ex vivo tensile mechanical testing of mouse spinal dura due to thin meningeal morphology causing tissue fragility compared to rat, pig, or human tissues.
RARE VARIANTS IN FIBRILLIN-2 AS MODULATORS OF SUSCEPTIBILITY TO SPONTANEOUS SPINAL CEREBROSPINAL FLUID LEAKS · Johns Hopkins · PhD
Tried and failed
direct fluorescent ROS and oxidative damage probes applied to ex vivo dissected gut tissue. Outcome: no signal. Reason: probes failed to yield reliable detection in dissected tissue ex vivo
Exploring the effects of diet-induced obesity on the invasiveness of Drosophila tumours · Imperial · PhD
Considered and rejected
Considered and rejected: Rejected ex-vivo 3D LGE-CMR images for progression analysis due to irreversible loss of metabolic function, anatomical structure, and geometry relative to in-vivo space.
Image Processing Techniques for Analysis of Myocardial Fibrosis and Related Cardiomyopathies in Cardiac Magnetic Resonance Imaging · Carleton University · PhD
Tried and failed
correlating dynamic in vivo spectroscopy with ex vivo histology applied to tissue oxygenation monitoring in tumours. Outcome: no signal. Reason: dynamic real-time physiological measurements did not correlate with static post-mortem immunohistochemical staining
Sensing rectal cancer hypoxia for advanced prognostication and response monitoring · Imperial · PhD
Large probe dimensions cause tissue trauma and restrict temporal resolution
Standard microdialysis probes were rejected due to probe diameters reaching 200 to 400 micrometers that caused physical tissue damage. These probes also exhibited poor temporal resolution that could not resolve sub-minute dynamics and suffered from analyte loss.
Considered and rejected
Considered and rejected: Rejected microdialysis due to poor temporal resolution (minutes) and large probe size causing tissue trauma.
Concurrent neurochemical and neurophysiological investigation of fMRI signals · Tübingen · PhD
Considered and rejected
Considered and rejected: Rejected standard microdialysis probes due to large diameters (200-400 µm) causing tissue damage and semipermeable membranes causing analyte/extracellular vesicle loss
Monitoring and Treating Neurological Conditions Through Focal Interfacing with the Brain · MIT · PhD
Considered and rejected
Considered and rejected: Rejected microdialysis with HPLC for monitoring rapid dopamine and acetylcholine dynamics due to sub-minute temporal limitations and probe-induced tissue trauma.
Probing presynaptic regulation of dopamine release in health and disease · Oxford · PhD
Rapid ischemic degradation and anoxia limit the viable lifespan of ex vivo tissue
Excised tissue slices underwent rapid ischemia within three hours of incubation, falling short of the time required for experimental assays. Furthermore, the anoxic period between tissue excision and immersion fixation induced artifactual ultrastructural changes.
Tried and failed
fluorescence viability assay on ex vivo tissue slices applied to bovine liver tissue viability measurement. Outcome: no signal. Reason: control tissue slices underwent rapid ischemia, reaching zero viability within three hours of incubation
Predicting blast injury to the torso · Imperial · PhD
Tried and failed
capsaicin-induced epithelial permeability modulation applied to ex vivo tissue electrophysiology assays. Outcome: too slow. Reason: Action required tens of minutes, exceeding post-euthanasia ex vivo tissue viability limits
Detecting Tight Junction-Mediated Epithelial Barrier Dysfunction in Altered Gravity Environments · MIT · PhD
Semipermeable membrane cutoffs cause severe recovery loss for large proteins
Sampling large proteins through microdialysis membranes resulted in extreme extraction losses with recoveries dropping to 7.3 to 20 percent. Standard semipermeable membranes failed to provide adequate recovery for large macromolecules in vivo.
Tried and failed
microdialysis sampling through micro-capillary fluidic interfaces applied to sampling of large proteins. Reason: extreme extraction loss with recovery dropping to 7.3-20% for large proteins
Tools for Monitoring and Modulating Cellular Communication · MIT · PhD
Tried and failed
membrane-based microdialysis sampling applied to large protein extraction in vivo. Outcome: worse than baseline. Reason: semipermeable membranes cause substantial extraction loss and low molecular weight recovery for large proteins
Monitoring and Treating Neurological Conditions Through Focal Interfacing with the Brain · MIT · PhD
Left open by the authors
Problems the authors named and did not get to.
Left open
Compare intravenous delivery of succinate to microdialysis delivery in larger traumatic brain injury patient cohorts. Blocker: Requires clinical trials, TBI patients, specialized microdialysis equipment, intravenous drug administration, and clinical MRI/MRS scanners.
Understanding and ameliorating perturbations of human cerebral energy metabolism after major trauma · Cambridge · PhD
Left open
Conduct a clinical study interrogating human brain metabolism kinetics using in-vivo 13C MRS following traumatic brain injury per the thesis protocol. Blocker: Requires clinical access to TBI patients, specialized MRI scanners with custom coils, and wet-lab/microdialysis equipment.
Understanding and ameliorating perturbations of human cerebral energy metabolism after major trauma · Cambridge · PhD
Left open
Measure sub-tissue metabolite levels and spatial heterogeneity using microdialysis or micro-invasive collection platforms in tumor models. Blocker: Requires wet lab facilities, tissue samples, and physical microdialysis or micro-invasive experimental platforms
The influence of nutrient availability on tumor metabolism · MIT · PhD
Left open
Analyze late-stage blood samples (>7 days post-injury) from microdialysis patients to evaluate the effect of catheter insertion on neurofilament light levels. Blocker: Requires access to longitudinal clinical patient blood samples and wet lab biomarker assay facilities
Clinical features, biomechanics and advanced biomarkers across the spectrum of traumatic brain injury. · Imperial · PhD
Left open
Investigate in vivo brain dialysate choline concentration dynamics during cardiac arrest and resuscitation using microfluidic biosensors. Blocker: Requires in vivo animal models of cardiac arrest, wet lab microdialysis sampling, and custom biosensor hardware
Development of a microfluidic biosensing system for real-time monitoring of acetylcholinesterase activity · Imperial · PhD
Left open
Investigate whether diffusion limitations across dialysis membranes cause the biphasic protein synthesis rate in PURE cell-free systems. Blocker: Requires wet lab equipment, PURE cell-free expression reagents, and dialysis reaction setups
Proteins as sustainable and recyclable polymers for a circular economy in bioplastics · EPFL · PhD
Left open
Extend the counter-current dialysis computational model to incorporate membrane binding and absorption of protein-bound toxins. Blocker: Requires wet lab experimental data for characterizing membrane absorption and binding kinetics of other protein-bound toxins.
Experimental Validation of Computational Model for Circulating Albumin Dialysis and Optimization of Conditions · University of Washington · PhD
Who has worked on this
Authors of the public theses cited on this page, most-cited first.
- Georgia Smith · Imperial · PhD · 2023
Development of a microfluidic biosensing system for real-time monitoring of acetylcholinesterase activity - Matthew Stovell · Cambridge · PhD · 2021
Understanding and ameliorating perturbations of human cerebral energy metabolism after major trauma - Hannah Dale Jackson · MIT · PhD · 2025
Monitoring and Treating Neurological Conditions Through Focal Interfacing with the Brain - Madelyn MacRobbie · MIT · PhD · 2026
Detecting Tight Junction-Mediated Epithelial Barrier Dysfunction in Altered Gravity Environments - Fletcher Edward · Imperial · PhD · 2025
Sensing rectal cancer hypoxia for advanced prognostication and response monitoring - Keene Louis Abbott · MIT · PhD · 2025
The influence of nutrient availability on tumor metabolism - Laura Roset Julià · EPFL · PhD · 2025
Proteins as sustainable and recyclable polymers for a circular economy in bioplastics - Cassie An-Li Parks · Johns Hopkins · PhD · 2024
RARE VARIANTS IN FIBRILLIN-2 AS MODULATORS OF SUSCEPTIBILITY TO SPONTANEOUS SPINAL CEREBROSPINAL FLUID LEAKS - Alexander Novokhodko · University of Washington · PhD · 2024
Experimental Validation of Computational Model for Circulating Albumin Dialysis and Optimization of Conditions - Hirotaka Tsukada · Imperial · PhD · 2023
Predicting blast injury to the torso - R Anand · Oxford · PhD · 2023
Probing presynaptic regulation of dopamine release in health and disease - Erin Byrne Rousseau · MIT · PhD · 2022
Tools for Monitoring and Modulating Cellular Communication
Checking a claim in this area?
We can run the same search on any method or claim. If nothing turns up, we will say so, and that proves nothing on its own.