Registry
Core property registry
Each term fixes a canonical quantity kind, a canonical unit, a value shape and a causal class. Adding a term is additive. Redefining a term is forbidden.
Causal class control
27 terms.
| Term | Quantity kind | Unit | Value shape | Domain | Definition |
|---|---|---|---|---|---|
| wwd:anchor_spacing | length | mm | scalar | 0 to unbounded | Distance between the mechanical anchors a tissue develops tension against. |
| wwd:coating_areal_density | areal_mass_density | ug/cm2 | scalar | 0 to unbounded | Mass of adhesion coating applied per unit substrate area, such as laminin or fibronectin. |
| wwd:culture_co2_fraction | fraction | 1 | scalar | 0 to 1 | Volume fraction of carbon dioxide in the incubator or vessel headspace. |
| wwd:culture_oxygen_fraction | fraction | 1 | scalar | 0 to 1 | Volume fraction of oxygen in the incubator or vessel headspace. |
| wwd:culture_temperature | temperature | degC | scalar | -273.15 to 100 | Incubation temperature during culture. |
| wwd:ecm_stiffness | modulus | kPa | scalar | 0 to unbounded | Elastic modulus of the extracellular matrix the cells are embedded in or plated on, as prepared. |
| wwd:electrode_count | count | 1 | scalar | 0 to unbounded | Number of electrodes in the array serving one sampling unit. |
| wwd:electrode_diameter | length | mm | scalar | 0 to unbounded | Diameter of one electrode's exposed contact area. |
| wwd:electrode_pitch | length | mm | scalar | 0 to unbounded | Centre-to-centre spacing of adjacent electrodes in an array. |
| wwd:matrix_composition | categorical | 1 | categorical | unbounded | Identity of the matrix formulation, by reference to a protocol or a ChEBI/vendor identifier. |
| wwd:matrix_concentration | mass_concentration | mg/mL | scalar | 0 to unbounded | Total mass of matrix solids per unit volume of the cast mixture, before compaction. |
| wwd:matrix_formulation | composition | 1 | composition | 0 to 1 | Proportions of the identified constituents of the matrix, as nonnegative fractions summing to one. |
| wwd:mechanical_preload | force | uN | scalar | 0 to unbounded | Static tension applied to a tissue before functional measurement. |
| wwd:medium_formulation | categorical | 1 | categorical | unbounded | Identity of the culture medium formulation, by reference to a protocol or vendor catalogue identifier. |
| wwd:oxygen_tension | pressure | kPa | scalar | 0 to unbounded | Partial pressure of oxygen in the culture environment. |
| wwd:photostimulation_irradiance | irradiance | mW/mm2 | scalar | 0 to unbounded | Optical power per unit area delivered at the tissue surface. |
| wwd:photostimulation_wavelength | wavelength | nm | scalar | 0 to unbounded | Peak wavelength of light delivered for optogenetic stimulation. |
| wwd:pillar_stiffness | spring_constant | uN/um | scalar | 0 to unbounded | Lateral bending stiffness of a compliant post used to anchor a tissue and to read out its force from deflection. |
| wwd:print_nozzle_temperature | temperature | degC | scalar | -273.15 to 300 | Extrusion nozzle temperature during bioprinting. |
| wwd:recovery_duration | elapsed_time | h | scalar | 0 to unbounded | Time a component is held under stated conditions after unpacking, before acceptance measurement. |
| wwd:seeding_density_areal | areal_density | cells/mm2 | scalar | 0 to unbounded | Cell count per unit area of substrate at the moment of plating. |
| wwd:seeding_density_volumetric | number_density | cells/mL | scalar | 0 to unbounded | Cell count per unit volume of a cast or cell-laden gel at the moment of casting. |
| wwd:stimulation_amplitude | electric_field_strength | V/cm | scalar | 0 to unbounded | Applied field strength during electrical stimulation. |
| wwd:stimulation_duty_cycle | fraction | 1 | scalar | 0 to 1 | Fraction of the stimulation period during which the stimulus is on. |
| wwd:stimulation_frequency | frequency | Hz | scalar | 0 to unbounded | Pulse repetition rate during electrical stimulation. |
| wwd:stimulation_pulse_width | signal_duration | ms | scalar | 0 to unbounded | Duration of one stimulation pulse. |
| wwd:substrate_modulus | modulus | kPa | scalar | 0 to unbounded | Elastic modulus of the non-living substrate or scaffold body the cells are plated on or cast against, as prepared. |
Causal class response
26 terms.
| Term | Quantity kind | Unit | Value shape | Domain | Definition |
|---|---|---|---|---|---|
| wwd:active_electrode_fraction | fraction | 1 | scalar | 0 to 1 | Fraction of electrodes meeting a stated activity threshold. |
| wwd:burst_duration | event_duration | s | scalar | 0 to unbounded | Duration of a single-electrode burst under the stated detection settings. |
| wwd:burst_rate | event_rate | 1/min | scalar | 0 to unbounded | Rate of single-electrode bursts, averaged over the declared analysis population. |
| wwd:capillary_density | areal_density | 1/mm2 | scalar | 0 to unbounded | Vessel count per unit cross-sectional area. |
| wwd:cell_alignment | order_parameter | 1 | alignment | 0 to 1 | Degree of cell-body alignment, expressed as for wwd:fiber_alignment. |
| wwd:compaction_ratio | ratio | 1 | scalar | 0 to unbounded | Final dimension as a fraction of the as-cast dimension after cell-driven matrix remodelling. |
| wwd:conduction_velocity | velocity | cm/s | scalar | 0 to unbounded | Propagation speed of an excitation wave across the construct. |
| wwd:contraction_frequency | frequency | Hz | scalar | 0 to unbounded | Spontaneous contraction rate. |
| wwd:cross_sectional_area | area | mm2 | scalar | 0 to unbounded | Area of the load-bearing cross-section, perpendicular to the axis along which force is developed and reported. |
| wwd:fatigue_retention | fraction | 1 | scalar | 0 to 1 | Fraction of initial force retained after a stated fatigue protocol. |
| wwd:fiber_alignment | order_parameter | 1 | alignment | 0 to 1 | Degree of fiber alignment expressed as a director plus an order parameter S in [0,1]. |
| wwd:half_relaxation_time | signal_duration | ms | scalar | 0 to unbounded | Interval from peak twitch force to half of that peak during relaxation. |
| wwd:mean_firing_rate | frequency | Hz | scalar | 0 to unbounded | Mean spike rate across analysed electrodes. |
| wwd:microbial_growth | categorical | 1 | categorical | unbounded | Outcome of a sterility test: growth or no growth, under a stated medium, temperature and incubation period. |
| wwd:mycoplasma | categorical | 1 | categorical | unbounded | Outcome of a mycoplasma test under a stated detection method. |
| wwd:network_burst_duration | event_duration | s | scalar | 0 to unbounded | Duration of a network-wide synchronous burst, from the first to the last spike of the burst under the stated detection settings. |
| wwd:network_burst_participation | fraction | 1 | scalar | 0 to 1 | Fraction of electrodes taking part in a network burst. |
| wwd:network_burst_rate | event_rate | 1/min | scalar | 0 to unbounded | Rate of network-wide synchronous bursts. |
| wwd:passive_tension | force | uN | scalar | 0 to unbounded | Static tension a tissue develops against its anchors at rest, before stimulation. |
| wwd:peak_twitch_force | force | uN | scalar | 0 to unbounded | Peak force of a single twitch contraction under a stated stimulation protocol. |
| wwd:purity | fraction | 1 | scalar | 0 to 1 | Fraction of cells expressing the stated identity marker set. |
| wwd:spontaneous_beat_rate | frequency | Hz | scalar | 0 to unbounded | Spontaneous beat rate of a cardiac construct. |
| wwd:tetanic_force | force | uN | scalar | 0 to unbounded | Peak force under fused tetanic stimulation. |
| wwd:time_to_peak_force | signal_duration | ms | scalar | 0 to unbounded | Interval from stimulus onset to peak twitch force. |
| wwd:unloaded_shortening | ratio | 1 | scalar | 0 to 1 | Fractional shortening of an unloaded construct during contraction. |
| wwd:viability | fraction | 1 | scalar | 0 to 1 | Fraction of cells scored viable by a stated assay. |
Causal class context
8 terms.
| Term | Quantity kind | Unit | Value shape | Domain | Definition |
|---|---|---|---|---|---|
| wwd:days_in_vitro | time | d | scalar | 0 to unbounded | Days elapsed since plating or seeding, the conventional developmental clock for cultures. |
| wwd:differentiation_batch | categorical | 1 | categorical | unbounded | Identifier of the independent differentiation run a population came from. |
| wwd:donor_id | categorical | 1 | categorical | unbounded | Pseudonymous donor identifier. MUST NOT carry direct personal identifiers. |
| wwd:electrode_impedance | impedance | kohm | scalar | 0 to unbounded | Electrode impedance magnitude at a stated frequency and in a stated electrolyte. |
| wwd:passage_number | count | 1 | scalar | 0 to 200 | Number of passages a population has undergone on receipt. |
| wwd:population_doublings | count | 1 | scalar | 0 to 500 | Cumulative population doublings a population has undergone. |
| wwd:reagent_lot | categorical | 1 | categorical | unbounded | Lot identifier of a medium component, matrix, coating or supplement, as supplied. |
| wwd:transit_duration | elapsed_time | h | scalar | 0 to unbounded | Time elapsed between despatch and unpacking. |
Causal class derived
1 terms.
| Term | Quantity kind | Unit | Value shape | Domain | Definition |
|---|---|---|---|---|---|
| wwd:specific_force | stress | kPa | scalar | 0 to unbounded | Active force normalised by the cross-sectional area that generated it. |
Quantity kinds in use
A quantity kind fixes a dimension and a scale of use.
| Quantity kind | Canonical units | Terms |
|---|---|---|
| area | mm2 | wwd:cross_sectional_area |
| areal_density | 1/mm2, cells/mm2 | wwd:capillary_density, wwd:seeding_density_areal |
| areal_mass_density | ug/cm2 | wwd:coating_areal_density |
| categorical | 1 | wwd:differentiation_batch, wwd:donor_id, wwd:matrix_composition, wwd:medium_formulation, wwd:microbial_growth, wwd:mycoplasma, wwd:reagent_lot |
| composition | 1 | wwd:matrix_formulation |
| count | 1 | wwd:electrode_count, wwd:passage_number, wwd:population_doublings |
| elapsed_time | h | wwd:recovery_duration, wwd:transit_duration |
| electric_field_strength | V/cm | wwd:stimulation_amplitude |
| event_duration | s | wwd:burst_duration, wwd:network_burst_duration |
| event_rate | 1/min | wwd:burst_rate, wwd:network_burst_rate |
| force | uN | wwd:mechanical_preload, wwd:passive_tension, wwd:peak_twitch_force, wwd:tetanic_force |
| fraction | 1 | wwd:active_electrode_fraction, wwd:culture_co2_fraction, wwd:culture_oxygen_fraction, wwd:fatigue_retention, wwd:network_burst_participation, wwd:purity, wwd:stimulation_duty_cycle, wwd:viability |
| frequency | Hz | wwd:contraction_frequency, wwd:mean_firing_rate, wwd:spontaneous_beat_rate, wwd:stimulation_frequency |
| impedance | kohm | wwd:electrode_impedance |
| irradiance | mW/mm2 | wwd:photostimulation_irradiance |
| length | mm | wwd:anchor_spacing, wwd:electrode_diameter, wwd:electrode_pitch |
| mass_concentration | mg/mL | wwd:matrix_concentration |
| modulus | kPa | wwd:ecm_stiffness, wwd:substrate_modulus |
| number_density | cells/mL | wwd:seeding_density_volumetric |
| order_parameter | 1 | wwd:cell_alignment, wwd:fiber_alignment |
| pressure | kPa | wwd:oxygen_tension |
| ratio | 1 | wwd:compaction_ratio, wwd:unloaded_shortening |
| signal_duration | ms | wwd:half_relaxation_time, wwd:stimulation_pulse_width, wwd:time_to_peak_force |
| spring_constant | uN/um | wwd:pillar_stiffness |
| stress | kPa | wwd:specific_force |
| temperature | degC | wwd:culture_temperature, wwd:print_nozzle_temperature |
| time | d | wwd:days_in_vitro |
| velocity | cm/s | wwd:conduction_velocity |
| wavelength | nm | wwd:photostimulation_wavelength |
A bare JSON number is refused in a scalar-or-field slot. Every dimensional quantity carries
a unit, and a dimensionless value carries the unit 1.
- The three Core registries.
- The assay registry, which names the terms each method measures.
- Example packages using these terms.