Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 4 de 4
Mais filtros

Base de dados
Intervalo de ano de publicação
Environ Monit Assess ; 194(6): 450, 2022 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-35608726


Sand samples were collected from four beaches near a cement factory in Ras Baridi, north of Yanbu, which hosts the largest green turtle rookery in Saudi Arabia. Heavy metal concentrations (Cd, Pb, Fe, Cr, Ni, Se, Sb, As, and Cu) were measured at three different depths. For most elements, there were no significant differences in concentrations among depths; however, significant differences were found among the nesting beaches in Ras Baridi, which were likely influenced by the wind direction from the factory. Fe, Cr, Cu, and Ni had elevated contamination factor values, suggesting that the nesting beaches downwind and adjacent to the cement factory contained moderately contaminated sand. Given the possibility of heavy metals being absorbed through eggshells, there is a potential risk of heavy metal contamination in clutches laid in Ras Baridi. The rising threat to the local ecology in Saudi Arabia due to recent coastal developments for tourism projects highlights the importance of monitoring heavy metal concentrations over time.

Metais Pesados , Tartarugas , Poluentes Químicos da Água , Animais , Monitoramento Ambiental , Sedimentos Geológicos , Metais Pesados/análise , Metais Pesados/toxicidade , Medição de Risco , Areia , Arábia Saudita , Poluentes Químicos da Água/análise , Poluentes Químicos da Água/toxicidade
Forensic Sci Int ; 302: 109867, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31284202


In preparing to respond to security incidents involving radioactive material, States should consider how they might address the unique challenge of analysing forensic evidence contaminated with these materials. In the case of DNA evidence, previous research has suggested that commercial forensic DNA extraction kits may be able to remove radioactive contamination from biological samples. If viable, this would allow the extraction and decontamination of biological samples to be undertaken in a laboratory equipped to handle radioactive material, with the subsequent quantification and profiling of extracted DNA performed in a conventional forensics laboratory. In order to inform the development of an operational capability, this study sought to expand upon previous work to provide a more comprehensive quantitative assessment of the efficacy of commercial DNA extraction kits for the removal of radionuclide contamination from biological samples and the quality of the resultant DNA profiles. Three commercial DNA extraction kits were tested for their ability to remove contaminating radionuclides. Two of these kits proved more effective at removing radionuclide contamination and produced DNA extracts of higher quality. Under all conditions tested in this study, decontamination efficiency was sufficient to allow the release of samples to a forensic laboratory. However, consistent with a prudent approach to radiation safety it is recommended that all samples be screened by gamma spectrometry prior to their release to a forensic laboratory in order to verify decontamination.

Impressões Digitais de DNA , DNA/isolamento & purificação , DNA/efeitos da radiação , Descontaminação , Radioisótopos , Manejo de Espécimes/instrumentação , Bombas (Dispositivos Explosivos) , Contaminação de Equipamentos , Genética Forense , Humanos , Masculino , Espectrometria gama
Methods Mol Biol ; 1810: 1-11, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29974413


Color tests are a key tool for the rapid and simple identification of seized illicit drugs. This chapter outlines a series of color tests that can be used for the preliminary identification of new psychoactive substances such as cathinones, piperazines, tryptamines, and amphetamine-type stimulants.

Colorimetria , Drogas Ilícitas/análise , Drogas Ilícitas/química , Detecção do Abuso de Substâncias , Anfetaminas/análise , Anfetaminas/química , Colorimetria/métodos , Humanos , Estrutura Molecular , Detecção do Abuso de Substâncias/métodos
Anal Chem ; 88(3): 1496-505, 2016 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-26703823


Nuclear forensic science, or "nuclear forensic", aims to answer questions about nuclear material found outside of regulatory control. In this Feature, we provide a general overview of nuclear forensics, selecting examples of key "nuclear forensic signatures" which have allowed investigators to determine the identity of unknown nuclear material in real investigations.

Ciências Forenses/métodos , Aplicação da Lei , Monitoramento de Radiação , Resíduos Radioativos/análise , Medidas de Segurança , Humanos