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Zoekresultaten - 61 results
Method development for analysis of nanoplastics in drinking water and milk using transmission electron microscopy (TEM)
risk assessment. This TEM-based approach was validated using polystyrene (PS) reference beads in the size range 60-500 nm, encompassing all analysis steps, from sample preparation to image analysis. Typically, the ...
Assessing particle count in electron microscopy measurements of nanomaterials to support regulatory guidance
electron microscopy nanomaterial Particle count Particle shape Particle Size Precision Regulatory guidance uncertainty Abstract: In the European Union, nanomaterials are regulated through different pieces of ...
Accuracy of immunological tests on serum and urine for diagnosis of Taenia solium neurocysticercosis: A systematic review
localization and stage according to a developed confidence scale, and with selection of tests evaluated on a sufficiently high sample size. A QUADAS-2 risk of bias assessment was performed. After screening, 169 ...
A validation methodology for size and shape measurement of nanoplastics by transmission electron microscopy
polystyrene sample. The intermediate precision obtained is similar for all size parameters. It ranges from 1.1-6.7%, 0.7-1.5% and 0.3-0.7% for materials 3060A, 3200A and 3500A, respectively. The highest values ...
Characterization of functional nanoparticles applied in face masks by STEM-EDX
embedded within the fibres, and some are also present on the edge of fibres. A preliminary quantitative analysis of TiO2 in selected samples, reveals an average aggregate/agglomerate size of 186 nm and an ...
Cluster pattern analysis of environmental stressors and quantifying their impact on all-cause mortality in Belgium
leads to a considerable number of diseases, hospitalisations, and excess mortality. Our study encompasses a representative sample size drawn from the Belgian population in 2016 (n = 11.26 million, with ...
Global and regional estimates of genital human papillomavirus prevalence among men: a systematic review and meta-analysis.
1, 2022. Inclusion criteria were population-based surveys in men aged 15 years or older or HPV prevalence studies with a sample size of at least 50 men with no HPV-related pathology or known risk ...
Risk Factors Associated with Severe RSV Infection in Infants: What Is the Role of Viral Co-Infections?
bronchiolitis, but heterogeneity and small sample size in our study prevents us from drawing strong conclusions. RSV is worldwide the leading cause of serious airway infections. Up to 90% of children will be ...
Time trends in the use of field-substitution in the Belgian health interview survey
BHIS (1997-2018) is assessed. We investigated to what extent field-substitution contributes to obtaining the requested net-sample size and whether this has evolved throughout the successive BHIS ’s. ...
Organizing the health interview survey at the local level: design of a pilot study.
target sample size was 1000 (≥ 15 years). A systematic sampling technique was applied with substitutes for non-respondents who were matched in terms of statistical sector, age and sex. Selected persons ...