Microplastics in European sea salts – An example of exposure through consumer choice and of interstudy methodological discrepancies

Microplastics are contaminants of emerging concern, not least due to their global presence in marine surface waters. Unsurprisingly, microplastics have been reported in salts harvested from numerous locations. We extracted microplastics from 13 European sea salts through 30% H2O2 digestion and filtration over 5-µm filters. Filters were visually inspected at magnifications to x100. A subsample of potential microplastics was subjected to Raman spectroscopy. Particle mass was estimated, and human dose exposure calculated. After blank corrections, median concentrations were 466 ± 152 microplastics kg-1 ranging from 74 to 1155 items kg-1. Traditionally harvested salts contained fewer microplastics than most industrially harvested ones (t-test, p < 0.01). Approximately 14 µg of microplastics (< 12 particles) may be absorbed by the human body annually, of which a quarter may derive from a consumer choosing sea salt. We reviewed existing studies, showing that targeting different particle sizes and incomplete filtrations hinder interstudy comparison, indicating the importance of method harmonisation for future studies. Excess salt consumption is detrimental to human health; the hazardousness of ingesting microplastics on the other hand has yet to be shown. A portion of microplastics may enter sea salts through production processes rather than source materials

Microplastics in European sea salts – An example of exposure through consumer choice and of interstudy methodological discrepancies

Microplastics are contaminants of emerging concern, not least due to their global presence in marine surface waters. Unsurprisingly, microplastics have been reported in salts harvested from numerous locations. We extracted microplastics from 13 European sea salts through 30% H2O2 digestion and filtration over 5-µm filters. Filters were visually inspected at magnifications to x100. A subsample of potential microplastics was subjected to Raman spectroscopy. Particle mass was estimated, and human dose exposure calculated. After blank corrections, median concentrations were 466 ± 152 microplastics kg-1 ranging from 74 to 1155 items kg-1. Traditionally harvested salts contained fewer microplastics than most industrially harvested ones (t-test, p < 0.01). Approximately 14 µg of microplastics (< 12 particles) may be absorbed by the human body annually, of which a quarter may derive from a consumer choosing sea salt. We reviewed existing studies, showing that targeting different particle sizes and incomplete filtrations hinder interstudy comparison, indicating the importance of method harmonisation for future studies. Excess salt consumption is detrimental to human health; the hazardousness of ingesting microplastics on the other hand has yet to be shown. A portion of microplastics may enter sea salts through production processes rather than source materials

Method Development for Determining the Removal of Metals from the Water Column under Transformation/Dissolution Conditions for Chronic Hazard Classification

An extension of the transformation/dissolution protocol (T/DP) was developed and evaluated as a tool to measure the removal of metals from the water column for chronic aquatic hazard classification. The T/DP extension (T/DP‐E) consists of 2 parts: T/DP‐E part 1, to measure metal removal from the water column via binding of metals to a substrate and subsequent settling, and T/DP‐E part 2, to assess the potential for remobilization of metals following resuspension. The T/DP‐E methodology (672‐h [28‐d] removal period, 1‐h resuspension event, and 96‐h resettling period) was tested using Cu, Co, and Sr solutions in the presence of a substrate. The metal removal rates varied from rapid removal for Cu to slower rates of removal for Co and Sr. The resuspension event did not trigger any increase in dissolved Cu, Co, or Sr. Additional 96‐h experiments were conducted using dissolved Ni, Pb, Zn, and Ag and supported the conclusion that the T/DP‐E is sufficiently robust to distinguish removal rates between metals with a wide range of reactivities. The proposed method provides a means to quantify the rate of metal removal from the water column and evaluate remobilization potential in a standardized and reliable way. Environ Toxicol Chem 2019;38:2032–2042. © 2019 SETAC.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/151361/1/etc4471.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/151361/2/etc4471_am.pd

The worldwide marine radiocarbon reservoir effect: definitions, mechanisms, and prospects

When a carbon reservoir has a lower radiocarbon content than the atmosphere, this is referred to as a reservoir effect. This is expressed as an offset between the radiocarbon ages of samples from the two reservoirs at a single point in time. The marine reservoir effect (MRE) has been a major concern in the radiocarbon community, as it introduces an additional source of error that is often difficult to accurately quantify. For this reason, researchers are often reluctant to date marine material where they have another option. The influence of this phenomenon makes the study of the MRE important for a broad range of applications. The advent of Accelerator Mass Spectrometry (AMS) has reduced sample size requirements and increased measurement precision, in turn increasing the number of studies seeking to measure marine samples. These studies rely on overcoming the influence of the MRE on marine radiocarbon dates through the worldwide quantification of the local parameter ΔR, that is, the local variation from the global average MRE. Furthermore, the strong dependence on ocean dynamics makes the MRE a useful indicator for changes in oceanic circulation, carbon exchange between reservoirs, and the fate of atmospheric CO2, all of which impact Earth's climate. This article explores data from the Marine Reservoir Database and reviews the place of natural radiocarbon in oceanic records, focusing on key questions (e.g., changes in ocean dynamics) that have been answered by MRE studies and on their application to different subjects

Binding of Superantigen Toxins into the CD28 Homodimer Interface Is Essential for Induction of Cytokine Genes That Mediate Lethal Shock

Bacterial superantigen toxins bind directly to the dimer interface of CD28, the principal co-stimulatory receptor, to induce a lethal cytokine storm, and peptides that prevent this binding can suppress superantigen lethality

Impact of egg harvesting on breeding success of black-headed gulls, Larus ridibundus

Gull colonies world-wide have been harvested for their eggs for centuries with minimal knowledge of the impacts on breeding. Although most Laridae can replace lost eggs, they have comparatively high energetic demands for egg production. In this paper we assess the impacts of a licensed egg harvest on the breeding success of black-headed gulls Larus ridibundus, which nest colonially in an EU Special Protection Area in Hampshire, Southern England. We compared egg volume, hatching and chick survival from harvested and un-harvested nests in central and fringe positions within colonies of various sizes, including colonies with no harvesting activity. Eggs from various laying stages were collected from harvested and un-harvested colonies of similar pre-harvest intrinsic quality, for comparison of their volumes, yolk-to-albumen ratios and eggshell thickness. Egg volume and the yolk-to-albumen ratio depended on laying time and location, with the largest eggs laid during the peak period by birds breeding in central positions on large colonies. Eggs produced by these peak layers also had the largest yolk-to-albumen ratios. Harvested sites were characterised by reductions in egg volume, yolk-to-albumen ratio and eggshell thickness, which translated to poorer hatching success and chick survival. Harvested sites also had a higher proportion of abnormal eggs, particularly taking the forms of small yolkless eggs and unpigmented eggs. The reduced breeding success on harvested colonies is likely to be linked to depletion of the female's endogenous reserves which can also reduce future survival and breeding propensity

Dataset for journal article: Microplastics in European sea salts &ndash; an example of exposure through consumer choice and of interstudy methodological discrepancies

This dataset contains: Data supporting the above mentioned publication can be found in the zip folder &#39;Raw data_Raman spectra files.zip&#39; and the excel file &#39;Raw data_Accompanying file for spectra.xlsx&#39;. The latter file is divided into tabs. Tab &#39;INFO&#39; Provides an overview of information found in the file. Tab &#39;Salt&#39; Contains results from library matching of Raman spectra data of analysed particles from commercial sea salt samples. Tab &#39;Blanks&#39; Contains results from library matching of Raman spectra data of analysed particles from blank samples run alongside commercial sea salt samples. Tab &#39;Packaging&#39; Contains results from library matching of Raman spectra data of analysed particles from the packaging of commercial sea salt samples. Further, the folder &#39;Raw data_images.zip&#39; contains images of potential microplastics that were isolated from commercial sea salt samples. Note: not all of these were identified to be plastic. </span

Music's Relevance for People Affected by Cancer: A Meta-Ethnography and Implications for Music Therapists

Background: Evidence supports music-based oncologic support interventions including music therapy. By comparison, little is understood about music-based self-care. This meta-ethnography examined five published qualitative studies to extend understanding of music’s relevance, including helpfulness, for people affected by cancer; including children, adolescents, and adults with cancer, carers, and the bereaved. Objective: To improve understanding of music’s broad relevance for those affected by cancer. Methods: Meta-ethnography strategies informed the analysis. Five studies were synthesized that included 138 participants: 26 children and 28 parents of children with cancer; 12 adolescents and young adults with cancer; 52 adults with cancer; 12 carers; and 8 bereaved. Studies’ category and thematic findings were compared and integrated into third-order interpretations, and a line of argument. Perspectives from the five studies that illuminated the line of argument were developed. Results: Music usage can remain incidental, continue normally, and/or change because of cancer’s harsh effects. Music can be a lifeline, support biopsychosocial and spiritual well-being, or become elusive, that is, difficult to experience. Music helps or intrudes because it extends self-awareness and social connections, and prompts play, memories, imageries, and legacies. Music therapists may help patients and carers to recover or extend music’s helpful effects. Conclusions: Cancer care can be improved through offering music-based resources/services, which give cancer patients and carers opportunities to extend music usage for personal support and, for carers, to support patients. Music therapists can advocate for such resources and educate health professionals about assessing/recognizing when patients’ and carers’ changed music behaviors signify additional support needs

Neisseria lactamica Protects against Experimental Meningococcal Infection

Immunological and epidemiological evidence suggests that the development of natural immunity to meningococcal disease results from colonization of the nasopharynx by commensal Neisseria spp., particularly with N. lactamica. We report here that immunization with N. lactamica killed whole cells, outer membrane vesicles, or outer membrane protein (OMP) pools and protected mice against lethal challenge by a number of diverse serogroup B and C meningococcal isolates in a model of bacteremic infection. Sera raised to N. lactamica killed whole cells, OMPs, or protein pools were found to cross-react with meningococcal isolates of a diverse range of genotypes and phenotypes. The results confirm the potential of N. lactamica to form the basis of a vaccine against meningococcal disease