CEFAS11ebd3ad-c4fb-4b58-85de-118da2fbed08 English dataset Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk pointOfContact 2024-07-24T10:45:41 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Microplastic effect data. The world is your oyster: low-dose, long-term microplastic exposure of juvenile oysters 2019-12-18 publication 2024-07-24 revision 2019-12-12 creation CEFAS20201 https://data.cefas.co.uk This dataset contains three separate files form an eighty day exposure study where we exposed juvenile oysters, Crassotrea gigas, to 3 different MP concentrations (10Power4, 10Power5, 10Power6 particles LPower minus 1), represented by 6 Microns Polysyrene (PS) microbeads, compared to a control treatment receiving no MP. There is a data file for shell growth and length, one for condition index and one for lysosomal stability. Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk originator Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk custodian Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk distributor European Commission info@publications.europa.eu owner notPlanned Biomarker Ecotoxicity GEMET, version 1.0 2008-06-01 publication Bioassay and contaminant biological impact SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Water column SeaVoX Vertical Co-ordinate Coverages 2010-05-18 revision Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 publication data.gov.uk MEDIN metadata record availability 2012-01-11 publication otherRestrictions noLimitations otherRestrictions Public data - no limitations to reuse English biota 1.73881 1.74086 52.4581 52.4595 2012-06-30 2019-12-13 Delimited Unknown https://data.cefas.co.uk/view/20201 Cefas Data Portal download The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: CSV. dataset INSPIRE Data Specification on Species Distribution – Technical Guidelines 2013-12-10 publication false See the referenced specification Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication true See the referenced specification Shell Length & Weight: Shell height, the maximum dimension from hinge to growth edge, is commonly referred to as shell length, which will be used to describe this dimension here. The shell length of every oyster was measured to the nearest mm. Additional dimensions were measured to account for irregular oyster shapes (e.g. long and thin). All measurements (±1.0 mm) were taken using a digital calliper system that enabled the rapid recording of data. In the weighing technique, oysters were air dried at room temperature for 5 minutes and weighed to the nearest 0.0001g. Oyster meat was oven dried to constant weight (68C for 48 hours) and then meat and shell were weighed separately to the nearest 0.0001g, after a short cooling period. Condition Index; The CI of bivalves is measured by relating either the weight or volume of the meat to some aspect of the shell. In the current study, oyster shell length and weight measurements were standardized using the following formula: Condition Index = (dry meat weight in g) * 100 / (shell weight in g). This widely-used condition index, because of the nature of the measurements involved, is easily standardized and is thus used globally. In addition, the use of dry tissue weights eliminates the bias due to water content fluctuations of whole tissue. A low value for this index indicates that a major biological effort has been expended, either as maintenance energy under poor environmental conditions or disease, or in the production and release of gametes. Thus, as an indicator of stress, or sexual activity, this index gives meaningful information about the physiological state of the animal. Lysosomal Membrane Stability; A series of solutions and reagents were used to test LMS. A lysosomal membrane labilising buffer (Solution A) was made with 0.1M Na-citrate Buffer - 2.5% NaCl w:v (pH 4.5). The substrate incubation medium (Solution B) consisted of 20 mg of N-Acetyl-β-hexosaminidase (Sigma, N4006) or Napthol AS-BI phosphate (Sigma N2125), dissolved in 2.5 mL of 2-methoxyethanol (Merck, 859) and made up to 50 mL with solution A. This solution contained 3.5 g of collagen-derived polypeptide (POLYPEP, P5115 Sigma) as low viscosity polypeptide to act as a section stabiliser. This solution was prepared 5 minutes before use. The diazoniumdye (Solution C) contained 0.1M Na-phosphate buffer (pH 7.4) containing 1 mg mL-1 of diazonium dye Fast Violet B salts (Sigma, F1631). The fixative (Solution D) was made from Baker’s calcium formol containing 2.5% NaCl (w:v). An aqueous mounting medium (Vector Laboratories H1000, Kaiser glycerine gelatine, Difco, Sigma) was used. The lysosomal membrane stability was cytochemically determined using N-Acetyl-β-hexosaminidase. Cryostat sections were cut at 8-10µm (in duplicate on the same slide) and left in the cryostat chamber until just before use. Seven slides were prepared in this manner. Solution A was placed into a water bath at 37 °C to acclimatise. The slides were placed into pre-treatment solution A so that each slide had a different pre-treatment time of 30, 25, 20, 15, 10, 5, and 2 minutes i.e. slide 7= 30 minutes, slide 6 = 25 minutes, slide 5= 20 minutes, etc. Following pre-treatment, slides were transferred to solution B for 20 minutes at 37 °C in a staining jar in a shaking water-bath. The slides were rinsed with a saline solution (3.0% NaCl) at 37 °C for 2 to 3 minutes. The slides were then transferred to solution C at room temperature for 10 minutes. Following this, slides were rinsed rapidly in running tap water for 5 minutes. Sections were fixed for 10 minutes in Solution D pre-cooled to 4 °C. Finally, slides were rinsed in distilled water, mounted in aqueous mounting medium and analysed. The labilisation period (LP) is the time of pre-treatment required to labilise the lysosomal membranes fully, resulting in maximal staining intensity for the enzyme being assayed. The staining intensity was assessed visually using microscopic examination. The labilisation period can be effectively measured by microscopic assessment of the maximum staining intensity in the pre-treatment series, a microdensitometer is not completely necessary for accurate determination. All assessments were carried out on duplicate sections for each digestive gland at each pre-treatment time. Lysosomes will stain reddish-purple due to the reactivity of the substrate with N-acetyl-ß-hexosaminidase. The LP for each section corresponds to the average incubation time in the acid buffer that produces maximal staining reactivity. LP for the other replicate is similarly obtained. Finally, a mean value of LMS of the sample was calculated utilizing the data obtained from the 10 animals analysed. Determination of the LP is usually quite straightforward, but a complicating situation occasionally arises in which the pre-treatment series shows two peaks of staining intensity, possibly due to differential latent properties of the subpopulations of lysosomes. In this situation**, **the first peak of activity was used to determine labilisation period as it is the most responsive to staining. MEDIN 3.1.1