Chapter Four · failure evidence
What Super-Resolution Microscopy got wrong, from 27 dissertations
The records describe various technical obstacles and trade-offs encountered when applying super-resolution microscopy techniques across biological and material samples. Many efforts failed or were rejected due to photobleaching, probe and labeling limitations, sample preparation distortions, optical depletion issues, and environmental constraints. These records come from PhD theses at 12 institutions, 2021 to 2026. 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.
Photobleaching, phototoxicity, and motion artifacts degrade image quality during prolonged acquisition
Extending acquisition times or using repeated exposures causes severe photobleaching, phototoxicity, and sample degradation that compromise super-resolution reconstruction. In addition, lengthy imaging sessions allow motion artifacts and non-specific background noise to accumulate.
Tried and failed
increasing acquisition duration at low tracer concentration applied to super-resolution localization imaging. Outcome: worse than baseline. Reason: noise accumulation and non-specific binding over time degraded local image quality
Effect of agent concentration in ultrasound super- resolution imaging at clinically low frequency · Imperial
Considered and rejected
Considered and rejected: Rejected mounting cells in Poly-D-Lysine/CFM3 or Poly-D-Lysine/water due to severe photobleaching (>50-67% loss after first rotation) compromising 3D super-resolution reconstruction.
Translocating under the radar: an investigation into the secretion pathway of EspC, a ‘classical’ autotransporter from enteropathogenic E. coli · University of Nottingham Repository
Considered and rejected
Considered and rejected: Rejected live-cell STORM imaging in favour of deconvolved widefield microscopy due to long acquisition times causing motion artefacts, phototoxicity, and poor image quality with SiR dyes.
Considered and rejected
Considered and rejected: Direct stochastic optical reconstruction microscopy (dSTORM) for BCR cluster characterization was abandoned due to sample degradation during storage, rapid photobleaching, and severe spatial artifacts.
Engineered Systems of the Germinal Center and Bone Marrow for Antigen-Specific B Cell Generation and Longevity · Georgia Tech
Probe labeling and blinking properties fail to provide adequate localization precision
Localization accuracy is severely impaired when fluorophores exhibit low photon budgets, poor blinking, or high photostability that prevents switching. Furthermore, using bulky signal amplification assemblies degrades spatial fidelity by introducing physical displacement errors.
Tried and failed
direct fluorophore labelling with live-cell DNA stain applied to chromatin localization super-resolution microscopy. Outcome: no signal. Reason: poor fluorophore blinking and overlapping point spread functions causing high localisation uncertainty
Tried and failed
direct fluorophore labelling without encapsulation applied to optical super-resolution localization microscopy. Outcome: worse than baseline. Reason: lower photon budget and significantly larger localization uncertainty compared to encapsulated probes
INFORMED DESIGN OF POLYMER-SELECTIVE NANOPROBES FOR OPTICAL SUPER-RESOLUTION MICROSCOPY · Cornell
Considered and rejected
Considered and rejected: Rejected stochastic optical reconstruction microscopy (STORM) due to low photobleaching and high photostability of ZnPcTS.
Preparation and Characterisation of Photoactive Supramolecular Soft Materials · University of Nottingham Repository
Considered and rejected
Considered and rejected: Rejected branched DNA (bDNA) signal amplification due to physical size of branch assemblies degrading super-resolution spatial fidelity
Sample preparation and hydrogel handling induce structural distortion in expansion microscopy
Incomplete enzymatic digestion of matrix components leads to anisotropic gel expansion and macroscopic sample distortion. Denaturation during hydrogel re-embedding and degradation of anchoring moieties during imaging also displace targets and cause nanometer-scale distortions.
Tried and failed
chemical softening without enzymatic matrix degradation applied to expansion microscopy of dense extracellular matrix. Reason: residual collagen network prevented isotropic gel expansion, leading to structural distortion
Developing Tools to Physically Magnify Biological Substrates for Clinical Applications · MIT
Tried and failed
sequential super-resolution and expansion microscopy applied to in situ DNA FISH imaging. Outcome: no signal. Reason: imaging buffer and exposure degraded gel-anchoring acrydite moieties, preventing target retention after expansion
Tried and failed
hydrogel re-embedding after sample expansion applied to super-resolution imaging of nanoscale molecular structures. Outcome: unstable. Reason: sample denaturation causes random anchor displacements and nanometer-scale structural distortions below 30 nm
Optical depletion and illumination beam interference limit resolution gains
Depletion and patterned illumination techniques struggle when optical filters re-excite fluorophores or when stray reflections corrupt phase retrieval. In addition, complex focal volume reduction methods can fail to narrow the observation volume compared to simpler configurations.
Tried and failed
3D STED microscopy for focal volume reduction applied to fluorescence correlation spectroscopy observation volumes. Outcome: worse than baseline. Reason: failed to reduce focal width below 100 nm compared to 2D STED
Analysis of liquid-liquid phase separated systems for artificial cell applications · Georgia Tech
Tried and failed
optical bandpass filtering for laser depletion applied to super-resolution fluorescence microscopy. Reason: filter band edge overlapped with fluorophore absorption spectrum, causing unwanted re-excitation
Extending Spatiotemporal Resolution of Super-Resolution Microscopy · Georgia Tech
Tried and failed
Fourier ptychographic microscopy applied to sub-Rayleigh imaging of photonic crystals. Outcome: did not converge. Reason: Parasitic reflections from inactive illumination array elements degraded phase retrieval measurement fidelity
Laser-Based Dual-Space Microscopy · Texas Tech
Incompatibility with environmental requirements and delicate sample conditions forces rejection of super-resolution methods
Super-resolution imaging workflows are often abandoned because stages lack necessary environmental controls for live cell maintenance. Chemical fixation and antibody labeling protocols can also introduce disruptive artifacts or require physical sectioning that damages delicate specimens.
Considered and rejected
Considered and rejected: Rejected STORM super-resolution imaging in favor of PALM because STORM requires fluorescent antibody labeling that necessitates physical sectioning of spores.
Investigating proteins that influence membrane-associated germination processes in Bacillus subtilis spores · Virginia Tech
Considered and rejected
Considered and rejected: Rejected super-resolution microscopy for live co-culture oxygen mapping because the microscope stage lacked physiological environmental control (5% CO2, 37°C), reverting to wide-field microscopy.
Development and application of oxygen nanosensors for the assessment of molecular oxygen in 2D and 3D cell culture · University of Nottingham Repository
Considered and rejected
Considered and rejected: Ruled out using chemical fixation techniques (such as electron microscopy or super-resolution microscopy) to directly verify TAT-MORN peptide disruption of dyadic clefts due to potential artifacts incompatible with the peptide's mode of action.
Left open by the authors
Problems the authors named and did not get to.
Left open
Perform immunofluorescent co-staining of amyloid and microglia to quantify co-localization and microglial morphology at higher resolution. Blocker: Requires a wet lab, biological tissue samples, and high-resolution fluorescence microscopy equipment.
Left open
Perform superresolution imaging studies across physiological contexts to experimentally estimate r* and excluded volume parameters. Blocker: Requires wet lab facilities, superresolution microscopy apparatus, and biological samples
Modeling and controlling resource loading in bacterial genetic circuits · MIT
Left open
Functionalize dye-doped core-shell nanoparticles with targeting proteins like Biotin-BSA and anti-CD71 for live-cell super-resolution imaging and tracking. Blocker: Requires wet lab chemical synthesis, biological cell cultures, and super-resolution fluorescence microscopy equipment
Synthesis and characterization of dye-doped nanoparticles for use in super-resolution fluorescence microscopy · Texas Tech
Left open
Combine super-resolution imaging and two-fluorophore FRET to quantify absolute copy numbers of cell-surface glycoRNAs per cell. Blocker: Requires wet lab biological samples and super-resolution microscopy apparatus
Left open
Validate the silent-synapse rapid acquisition hypothesis in vivo using super-resolution imaging alongside voltage indicators and GluSnFR activity reporters. Blocker: Requires a wet lab, live animal models, and in-vivo super-resolution optical imaging setups.
Functional and ultrastructural investigation of mouse and human dendritic spines · MIT
Left open
Combine umExM with super-resolution microscopy or 16x expansion methods to achieve higher resolution brain imaging. Blocker: Requires a wet lab, chemical synthesis reagents, biological samples, and optical super-resolution microscopy equipment.
Left open
Develop fluorescent chloride and voltage sensors achieving single-synapse spatial resolution and submillisecond temporal resolution. Blocker: Requires molecular biology wet lab, protein engineering, and live-cell optical imaging facilities
Interaction of Quantal Inhibitory and Excitatory Neurotransmission in Regulation of Synaptic Homeostasis via Molecular Signaling · DSpace at UTSWMED
Left open
Resolve Plasmodium basal complex subcompartments by combining ultrastructure expansion microscopy (U-ExM) with STED microscopy or iterative U-ExM. Blocker: Requires wet-lab parasite culturing, U-ExM sample preparation, and specialized STED super-resolution microscopy equipment.
Structure and function of the basal complex: the unique mechanisms of Plasmodium cytokinesis · Harvard
Left open
Apply super-resolution microscopy (STORM and SIM) to verify if high integrated density RAP1 foci represent longer telomeres or telomeric clusters. Blocker: Requires wet lab access, HeLa cell samples, and super-resolution microscopy equipment (STORM/SIM).
Telomeric localization of the TElomeric Repeat-containing RNA TERRA impairs telomerase activity in human cancer cells · IRIS - UNITN - prod
Left open
Construct single-synapse resolution maps of neurotransmitters and receptors across C. elegans and Drosophila nervous systems. Blocker: Requires wet-lab experimental imaging, genetic tagging, and electron microscopy data collection.
Neural Sequences Underlying Directed Turning in C. elegans · MIT
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.