3 research outputs found
Shelf, Coastal and Subglacial Polar Carbonates, East Antarctica
No full textModern and Pleistocene polar carbonates occur in East Antarctica in shelf, coast, lakes and marginal to underneath glaciers, associated mainly with glacigene muds, boulder tills and diamictites. Shelf carbonates (in Prydz Bay) are calcitic and unlithified, and consist mainly of sponges, bryozoans, echinoderms, bivalves and diatoms. Coastal carbonates (in the Vestfold Hills) are calcitic and contain faunal assemblages similar to those on the shelf, with calcareous algae, microbial mats, minor peloids and cements. Lake carbonates are aragonitic micrites and peloids. Carbonates close to glaciers (the Loken Moraines) are aragonitic and contain abundant ooids with intragranular fibrous cements. Subglacial carbonates are aragonitic micrites and peloids. Carbonate mineralogy changes from mainly low-Mg calcite in marine shelf to aragonite in brackish to freshwater dominated inland regions. Antarctic carbonate δ18O values (4.5 to -47‰ PDB) vary markedly due to frigid temperatures (0 to -2°C) and salinity (0 to 35‰) changes, as a result of meltwater dilution from adjacent glaciers. Their δ13C values (-9 to 8‰ PDB) also vary markedly due to exposure to atmospheric CO2, the circulation of water masses and reaction of carbonate with CO2 trapped in glacial ice. The regional distribution of carbonate sediments and their sedimentology, mineralogy, and δ18O and δ13C compositions indicate three types of glacial environments of formation. The first corresponds to a glacial stage and the formation of subglacial and bank carbonates, when the Antarctic ice sheet expanded onto the inner shelves. The second corresponds to interglacial stages and the formation of ice-marginal carbonates, during the retreat of the ice sheet from the inner shelf grounding line and accompanying the discharge of appreciable meltwater. The third corresponds to an interglacial oasis and the formation of coastal carbonates, proximal to distal lacustrine carbonates, and distal subglacial carbonates
Методика использования средств наглядности в трудовом обучении
No full textVisibility in the training helps to ensure that students have, thanks to the perception of objects and processes of the world, the understanding of the properly reflect objective reality, and at the same perceived phenomena are analyzed and summarized in connection with the learning objectives. Means of clarity on the lessons of labor training - this is a very necessary element. They help to better assimilation of knowledge among students, form an accurate representation of the object under study, whether it's the tool, material or process
Evaluating Cellpose SAM as a segmentation algorithm for downstream cell morphology analysis
No full text• It is known that exposing cells to chemicals can alter their morphology, for example Dimethyl Sulfoxide (DMSO) or Okadaic acid induceapoptosis, a programmed cell death characterised in part by cell membrane shrinkage and cytoplasm condensation [1].• To investigate the phenotypical changes of individual cells within a monolayer, the cell membranes need to be segmented.• Our aim was to optimise Cellpose SAM as a segmentation tool and to evaluate whether the morphological changes associated with cell death impact segmentation performance.• This was achieved by segmenting images of cell monolayers before and after treating them with an apoptosis inducing agent, henceforth known as ‘untreated’ and ‘treated’ images, respectively.Poster presented as part of the Crick BioImage Analysis Symposium 2025.Permission has been given by authors to upload to Crick Figshare. Copyright remains with the original authors.</p
