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TABLE 1: Example Subset of the Assay File Format
A | B | C | E |
|---|---|---|---|
Sample Name | Assay Name | Measurement Value[z-average(hydrodynamic diameter)] | Unit |
NCL-20-1 | size by DLS assay | 5.2 | nm |
NCL-20-2 | size by DLS assay | 8.6 | nm |
Fields
According to the ISA-TAB specification, the Assay File has different types of fields called nodes, attributes of nodes, qualifiers of nodes’ attributes, and other valid fields. In support of ISA-TAB-Nano, extensions were applied to the Assay File to record the endpoint value of an assay measurement (Measurement Value) as an attribute of the assay name.
The Assay File supports the following types of information:
- Sample name
- Assay protocol reference, protocol parameter values, performer, and date the protocol was performed
- Assay name
- Assay factor values including units, if applicable
- Assay nameAssay measurement values including units and qualitifed by statistics, if applicable
- Image files, raw data files, derived data files or other files, if applicable
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Sample Name--- The unique identification name of the sample, which is referred to from within the study file. The sample is obtained after the application of a protocol. Sample names can be qualified with Material Types, Characteristics and/or Comments.Assay Name---The name of the assay performed. This name is used as an identifier within the assay fileonly using Comment.
Image File---The name or URI of an image file generated from an assay.
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Derived Data File---The name or URI of the file resulting from data transformation or processing.
Attributes of
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assay nodes---One or more attributes are used to provide more information about a assay node. The different assay node attributes are described below:
Material Type---An attribute for the Sample Name sample name (for example, biospecimen, nanoparticle sample, small molecule etc.) if the same attribute is not given in the Study file. The term can be a free-text description or taken from an ontology or a controlled vocabulary. If it is the latter, then the following qualifiers are used: term accession number and term source REF.
Characteristics [ ]---An attribute for Sample Name sample name if the same attribute is not given in the study file.
Assay Name---The name of the assay performed. This name is used as an identifier within the assay file.
Attributes of Processing Events for Assay Nodes
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Protocol REF--- The name of the protocol used to perform the experiment. This name should be obtained from a value for the field study protocol name in the investigation file. Protocol REF can be further described using the following fields:
Parameter Value [ ]--- Value of a parameter, which is an intrinsic experimental condition that may be varied or constant, when applying a protocol. The parameter term is written within brackets and must match the term used as value for the study protocol parameter name in the investigation file.
Performer---The name of the person who carried out the protocol.
Date---The calendar day on which the protocol was carried out. The date format should be in YYYY-MM-DD.
Attribute of Assay Name
One or more attributes are used to record the assay endpoints.
Factor Parameter Value [ ]--- The value of an independent variable manipulated by the experimentalist with the intention to affect the subject of study (that is, stressor). Factor terms are given in brackets, and must be defined in the ISA-TAB-Nano investigation file in the STUDY FACTORS section. Factor Value [] in the Assay file should reference technical variations (such as software, instrument or protocol variations)Value of a parameter, which is kept constant, when applying a protocol. The parameter term is written within brackets and must match the term used as value for the study protocol parameter name in the investigation file.
Measurement Value [statistic(measurement name)]---The endpoint of the assay. Measurement value names are described in brackets or parenthesis if a statistics (e.g., mean, standard deviation) is applied to the measurement (Syntax: Measurement Value[statistic(<measurement name>)]). A statistic is only required for statistical measures.
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Term Source REF---The name which identifies the source from where a term is selected and entered in ISA-TAB-Nano study files. This name should match one of the names entered in the term source name field in the ISA-TAB-Nano Investigation File.
Other Assay Fields
Factor Value [ ]---The value of an independent variable manipulated by the experimentalist with the intention to affect the subject of study (that is, stressor). Factor terms are given in brackets, and must be defined in the ISA-TAB-Nano investigation file in the STUDY FACTORS section. Factor Value [] in the Assay file should reference technical variations (such as software, instrument or protocol variations).
Comment [ ]---Any comment that provides additional information, which is added only when no other appropriate field exists. Comment fields should be attached to the closest node or the field.
Files
The Assay File Examples, Template, and Glossary are provided below.
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