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Abstract
According to a well-known interpretation, Henry of Ghent holds that possible but non-existent essences – items merely with what Henry labels 'esse essentiae' – have some reality external to the divine mind, but short of actual existence (esse existentiae). I argue that this reading of Henry is mistaken. Furthermore, Henry identifies any essence, considered independently of its existence as a universal concept or as instantiated in a particular as an item that has some kind of reality in the divine intellect, and that constitutes an object of thought for that intellect. This object is distinguished from the universal concepts of creaturely cognition.

Purpose– The purpose of this paper is to describe the development process of building an assessment model to assess the emotional and behavioural needs of "looked after children".Design/methodology/approach– The paper is a technical paper developing and evaluating a process for comprehensively assessing children ' s needs using a combination of three existing tools.Findings– The paper identifies a model to assess "looked after" children and highlights some of the early benefits and challenges which have been encountered using this model.Practical implications– This paper suggests a model and timeframe to ensure that detailed assessments of the mental health of "looked after" children are effectively carried out.Social implications– There is a potential for an improvement in assessment of looked after children that will lead to the identification of appropriate interventions and services.Originality/value– The paper is new in identifying a combination of assessment measures and a timeline to complete these.

A substance may have one or more nanoforms, defined for regulatory purposes under EU chemicals legislation REACH based on differences in physicochemical properties such as size, shape, specific surface area and surface chemistry including coatings. To reduce the burden of testing each unique nanoform for the environmental risk assessment of nanomaterials, grouping approaches allow simultaneous assessment of multiple nanoforms. Nanoforms with initially different intrinsic properties, could still be considered similar if their environmental fate and effects can be demonstrated to be similar. One hypothesis to group nanoforms with different organic surface modifications is to use parameters linked to biodegradation of the organic surface. The hypothesis contends that nanoforms with a similar core chemistry, but different organic surface treatments may be grouped, if the surface treatment is likely to be lost through biodegradation rapidly upon entering an environmental compartment, such that it no longer modulates fate, exposure and toxicity of the nanoform. To implement grouping according to surface treatment biodegradability, a robust approach to measure the breakdown of particle surface treatments is needed. We present a tiered testing strategy to assess the biodegradation of organic surface treatments used with nanomaterials that can be implemented as part of an Integrated Approach to Testing and Assessment (IATA) for grouping based on surface treatment stability. The tiered approach consists of an initial pre-screening MT2 colorimetric carbon substrate utilisation assay, to provide a rapid assessment of coating degradation, and a second tier of testing using OECD Test Guideline 301F for assessing organic chemical biodegradability. Six common surface treatment substances are assessed using the tiered testing strategy to refine rules for escalating between tiers. Similarity assessment using absolute Euclidean distances and x-fold difference concluded that the Tier 1 assessment can be used as conservative binary ...