The TiPED process starts with a chemist theoretically at "the drawing board" and consists of five testing tiers, ranging from broad in silico evaluation through specific cell- and whole organism-based assays; it begins with the quickest and cheapest assays, leading to more specialized tests as needed.
Techniques and methods were discussed for improving bioaccumulation assessments [e.g., reducing animal testing, tiered approaches for bioaccumulation assessment, potential revision of the existing in vivo OECD TG 305 bioconcentration test (OECD 1996)], and how new methods could be efficiently developed in time to support the Canadian and the EU agencies in their evaluation of potential PBTs.
In this context, EFSA refers to 'tiered testing', with tier 1a and 1b referring to in vitro or in planta laboratory tests, while tier 2 refers to semi-field tests (i.e. outdoor tests with some containment) and tier 3 to field tests [3].
Thus, the effect testing at tier 1 comprises two different levels of complexity.
Neutralization efficiency of the patients' plasma was tested against tier 2 pseudoviruses (3 clade C - ZM53, Du172.17 and Du156.12 and 3 clade B - RHPA4259.7, TRO.11 and SC422661.8) obtained from NIH AIDS Research and Reference Reagent Program by TZM-bl assay.
Is top-tier performance always the right goal? A. Meeting the test of top-tier performance is very tough, if the measure is total return to shareholders.
The LHT and associated SOP provide a reliable second tier in a three-tiered testing process, in which the first tier is a suspension test and the final tier is a field test.
We applied personality tests to three tiers of public servants (doctors, inspectors and senior officials) across the 36 districts of Punjab.
Currently, chromosomal microarray analysis is considered the first-tier test in pediatric care and prenatal diagnosis.
If an LoC is exceeded at a specific tier, then further tests at higher tiers or modelling and scaling up of effects are considered necessary [3].
