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1,663 results for “shells”
Figure 4. 1H in General Protocol to Obtain D-Glucosamine from Biomass Residues: Shrimp Shells, Cicada Sloughs and Cockroaches
Figure 4. 1H NMR data (400 MHz, 298 K) of glucosamine hydrochloride in D O: a) 1H NMR spectrum with anomeric distribution at equilibrium; 2 b) mutarotation mechanism of glucosamine; c) anomeric region of the 1H NMR spectra recorded at different elapsed times; and d) relative amount of each anomer as a function of time.
Figure 2 in General Protocol to Obtain D-Glucosamine from Biomass Residues: Shrimp Shells, Cicada Sloughs and Cockroaches
Figure 2. Schematic representation of the general procedure to obtain D-glucosamine from shrimp shells, cicada sloughs, and cockroaches.
Figure 3. a in General Protocol to Obtain D-Glucosamine from Biomass Residues: Shrimp Shells, Cicada Sloughs and Cockroaches
Figure 3. a) IR and b) mass spectra of D-glucosamine obtained from shrimp shells; similar spectra were obtained for the glucosamine isolated from cicada sloughs and cockroaches.
Scrutinizing the protein hydration shell from molecular dynamics simulations against consensus small-angle scattering data (Simulation input files)
<p>Simulation input files for gromacs to reproduce the data from the manuscript "Scrutinizing the protein hydration shell from molecular dynamics simulations against consensus small-angle scattering data" (submitted to Comm. Chem.)</p>
Bioturbation increases time averaging despite promoting shell disintegration: a test using anthropogenic gradients in sediment accumulation and burrowing on the southern California shelf
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Data from: Shell dissolution rates differ fourfold between mussel species
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Data from: How long does a brachiopod shell last on a seafloor? Modern mid-bathyal environments as taphonomic analogues of continental shelves prior to the Mesozoic Marine Revolution
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Data from: Bivalve shells reflect 15N enrichment in a fertilizer-dominated estuary
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On the use of antibiotics in plasticity research: gastropod shells unveil a tale of caution
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Data from: Local adaptation in shell shape traits of a brooding chiton with strong population genomic differentiation
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3D Cortical Bone and Trabecular Bone Structure [synthetic data, simple, capsule shell model]
<p>Trabecular bone patterns are mimicked by generating and arranging "capsule shells" in a three-dimensional voxel by following probability distribution. Ground truth (gt) contains 4 labels (Background: 0, Cortical Bone: 11, Trabecular Bone: 21, Cavity: 31).</p>
Beating the shell game with barcodes: Diversity of meiofaunal Caecidae snails (Truncatelloidea, Caenogastropoda) from the Central America
<p>Single gene alignments of COI, 16S rRNA and 28s rRNA sequence data and combined alignments for COI, and16S rRNA as well as COI, 16S rRNA and 28s rRNA sequence data used for phylogenetic inference and species delimitation in the publication Beating the shell game with barcodes: Diversity of meiofaunal Caecidae snails (Truncatelloidea, Caenogastropoda) from the Central America. Original indicates the alignments before gblocks and manual adjustments were used to exclude ambiguous sites.</p>
Fig. 1 in Untangling species identity in gastropods with polymorphic shells in the genus Bolma Risso, 1826 (Mollusca, Vetigastropoda)
Fig. 1. Map showing sampling localities. See Supplementary file for details.
Data from: Appearances can be deceptive: bizarre shell microanatomy and histology in a new Triassic turtle (Testudinata) from Argentina at the dawn of turtles
The origin and homology of the turtle shell are one of the most captivating topics in amniote evolution. In this contribution, we present a new species of turtle from the Late Triassic of Argentina whose peripheral plates question the homology of these bones in turtles. The external morphology of the peripheral plates of <i></i>Waluchelys cavitesta<i></i> gen. et sp. nov. (Testudinata: Australochelyidae) is as in any other turtle, however, appearances can be deceiving. Internally, these plates exhibit an unexpected internal cavity. The absence of structural similarities and of ontogenetic or phylogenetic transitional forms between the peripheral plates of W. cavitesta and other testudinatans might suggest that the periphery of turtles represents a case of deep homology. Furthermore, the present and recent findings suggest that the structure and ossification patterns of the periphery of the turtle shell were more plastic and subject to variation than other elements of the shell, at least in the earliest stages of turtle evolution. These findings also suggest that the "typical" mesochelydian turtle shell could have been acquired in a two-stage process.
Shell biomass material supported nano-zero valent iron to remove Pb2+ and Cd2+ in water
Nanoscale zero-valent iron (NZVI) has a high adsorption capacity for heavy metals, but easily forms aggregates. Herein, preprocessed undulating venus shell (UVS) is used as support material to prevent NZVI from reuniting. The SEM and TEM results show that UVS had a porous layered structure and NZVI particles were evenly distributed on the UVS surface. A large number of adsorption sites on the surface of UVS-NZVI are confirmed by IR and XRD. UVS-NZVI is utilized for adsorption of Pb2+ and Cd2+ at pH=6 in aqueous solution, and the experimental adsorption capacities are 29.91 mg•g-1 and 38.99 mg•g-1 at optimal pH, respectively. Thermodynamic studies indicate that the adsorption of ions by UVS-NZVI is more in line with the Langmuir model when Pb2+ or Cd2+ existed alone. For the mixed solution of Pb2+ and Cd2+, only the adsorption of Pb2+ by UVS-NZVI conforms to the Langmuir model. In addition, the maximum adsorption capacities of UVS-NZVI for Pb2+ and Cd2+ are 93.01 mg•g-1 and 46.07 mg•g-1.Kinetic studies demonstrate that the determination coefficients (R2) of the pseudo first-order kinetic model for UVS-NZVI adsorption of Cd2+ and Pb2+ are higher than those of the pseudo second-order kinetic model and Elovich kinetic model. Highly efficient performance for metal removal makes UVS-NZVI show potential application to heavy metal ion adsorption.
Super-resolved Reflectance Confocal Microscopy 3D reconstruction of a Diatom shell
<p>These movies present back-to-back the performance in term of resolution of both standard reflectance confocal microscopy and super-resolved rescanned reflectance confocal microscopy. One movie is a 3D stack angular rotation, the other is a Zstack. </p> <p> </p>
Super-resolved Reflectance Confocal Microscopy data on Diatom shells and live MEF cells
<p>This dataset is linked to a paper submission in Open Research Europe. It contains the RAW data of confocal reflectance super-resolved point spread function, diatom shell zstack and time lapse imaging of a living Mouse Embryonic Fibroblast cell. </p>
Did shell-crushing predators drive the evolution of ammonoid septal shape?
<p class="AbstractSummary">For centuries, paleontologists have sought functional explanations for the uniquely complex internal walls (septa) of ammonoids, extinct shelled cephalopods. Ammonoid septa developed increasingly complex fractal margins, unlike any modern shell morphologies, throughout more than 300 million years of evolution. Some have suggested these morphologies provided increased resistance to shell-crushing predators. We perform the first physical compression experiments on model ammonoid septa using controlled, theoretical morphologies generated by computer-aided design and 3D printing. These biomechanical experiments reveal that increasing complexity of septal margins does not increase compression resistance. Our results raise the question of whether the evolution of septal shape may be tied closely to the placement of the siphuncle foramen (anatomic septal hole). Our tests demonstrate weakness in the centers of uniformly thick septa, supporting work suggesting reinforcement by shell-thickening at the center of septa. These experiments highlight the importance of 3D reconstruction using idealized theoretical morphologies that permit the testing of long-held hypotheses of functional evolutionary drivers by recreating extinct morphologies once rendered physically untestable by the fossil record.</p>
Data from: Diversity and preserved shell coloration patterns of Miocene Conidae (Neogastropoda) from an exposure of the Gatun Formation, Colon Province, Panama
Extant members of the neogastropod family Conidae (cone snails) are renowned for their often dazzling shell coloration patterns and venomous feeding habits. Many cone snail species have also been described from the fossil record, but to date have been little used to understand the evolutionary history of extant clades. The cone snail fauna of the Miocene Gatun Formation of Colón Province, Panama is especially important for understanding the temporal and biogeographic history of tropical American Conidae. Intensive, focused collecting from an exposure of the lower Gatun Formation (deposited ca. 11-10 Ma) resulted in the discovery of nearly 900 specimens of Conidae. Remarkably, many of these well-preserved specimens exhibit revealed coloration patterns when exposed to ultraviolet light. The fluorescing coloration patterns were used in conjunction with other features of shell morphology to differentiate species and, in most cases, evaluate their potential relationships to members of the extant tropical American fauna. Nine species are fully described from this locality, one of which is recognized as new: Conus (Stephanoconus) woodringi n. sp. At least one, and perhaps more, Conidae species are also present at the study locality. The diversity of this Conidae fauna is considered moderate relative to other recently analyzed tropical American fossil assemblages. The phylogenetic diversity of the assemblage, however, is noteworthy: six of the ten species can be confidently assigned to six different clades of extant Conidae, providing potentially useful calibration points for future phylogenetic studies.
Data from: Evaluating shell variation across different populations of a freshwater snail
The freshwater snail Potamopyrgus antipodarum has become a model system for studying invasion ecology, host–parasite coevolution, the maintenance of sexual reproduction and ecotoxicology. One understudied aspect of this snail is the variation in morphology within and among populations, which could provide insights into ecological differences across its native range. In this study of 17 New Zealand lake populations of P. antipodarum we used linear measurements and geometric morphometrics to compare several aspects of shell size and shape. We found that, except for those from Lake Te Anau, most lake populations of P. antipodarum differ slightly in shape, but differ significantly in size and in the presence of spines, where larger and spinier snails are found in deeper regions. These striking distinctions in size and shell armature, but not in shape, suggest that the various components of form are under different selective regimes. Snails from Lake Te Anau are different in both shape and size, implying that this population is diverging from the rest of the species in multiple ways, making it an interesting study population for further research.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.