Educational research guide · Concepts, not validated hardware
Algae biotechnology glossary
Definitions for reading algae cultivation and single-cell research, with the measurement limitations that short dictionary entries often omit. Each term links to a deeper explanation.
Cyanobacteria
Photosynthetic bacteria. Unlike eukaryotic algae, they do not have a membrane-bound nucleus or chloroplast. Some are unicellular and others filamentous; neither appearance nor a broad taxonomic label establishes food safety.
Microalgae
A practical grouping of microscopic photosynthetic organisms, not a single taxonomic lineage. Applied literature sometimes includes cyanobacteria alongside eukaryotic microalgae. State which organism and strain a claim concerns.
Arthrospira and Spirulina
Spirulina is a common commercial name associated with filamentous cyanobacteria historically called Arthrospira. Scientific naming changes, so strain identity and the naming used by a source matter more than a market label alone.
Photobioreactor
A cultivation system that supplies light to photosynthetic organisms while managing culture conditions. Vessel geometry, light path, gas exchange, nutrients and temperature interact; enclosure alone does not guarantee sterility or productivity.
Optical density
A logarithmic measure of light attenuation through a sample relative to a reference. In cell suspensions it includes scattering as well as absorption. Record wavelength, path length, blank and dilution; converting it to biomass requires an appropriate calibration [2].
Dissolved oxygen
Oxygen present in solution, commonly reported as concentration or percent saturation. Temperature, salinity, calibration and gas exchange affect interpretation. A high value alone does not establish cell damage or a universal stress threshold.
Photoinhibition
A reduction in photosynthetic performance associated with excess light relative to an organism’s ability to use and dissipate absorbed energy. Response depends on strain, exposure history and conditions; brighter illumination is not always more useful.
Beer–Lambert attenuation
An idealized exponential relationship between light transmission, path length and attenuating material. Dense, scattering cultures and changing pigment composition can violate simple assumptions; treat a fitted attenuation coefficient as condition-dependent [2].
Droop model
A nutrient-quota growth model in which growth depends on nutrient stored within a cell rather than only on the dissolved nutrient outside it. Choosing a quota model does not establish fitted parameters or predictive accuracy for a particular culture.
Digital twin
A model associated with a particular physical system and updated using observations of that system. An uncalibrated educational simulation is not a validated twin of a working reactor. Forecast usefulness must be evaluated against held-out measurements.
Microfluidics
Handling fluids in small channels or compartments where geometry and interfaces strongly shape transport. Droplets, microwells and flow-through channels solve different observation problems; their effects on cells must be tested [1].
Phenotyping
Measuring observable characteristics under defined conditions. Image features may be useful proxies, but a label such as productive or stress-tolerant requires a declared biological measurement and appropriate validation [1].
Single-cell analysis
Measurements resolved to an individual cell or lineage rather than only a pooled average. Maintaining identity across images, division events and recovery is essential; repeated frames are not independent biological samples [1].
Machine vision
Computational extraction of information from images. Segmentation, tracking and classification depend on imaging conditions and labeled examples. Confidence scores do not certify organism identity, food safety or actuator safety.
Sources and scope
[1] Behrendt et al. (2020), PhenoChip. [2] Schagerl et al. (2022), biomass and vitality measurement methods. These sources explain measurement practice, not validated performance of Orr Biologicals hardware.
Use the research topic and methodology hub to choose a reading path. This glossary is educational, not a cultivation protocol or food-safety assessment.