Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
4,489
datasets available to search
ShareScore release 0.9.0
Dataset results
4,489 results for “transitivity”
Figure 6 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 6. Dopasia roqueprunensis, incomplete parietal, IRSNB R 247, previously BOU-AR-38-RS. 6a, dorsal view; 6b, ventral view.
Figure 5 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 5. Dopasia roqueprunensis, nearly complete left dentary, IRSNB R 246, previously BOU-AR-26-RS. 5a, lateral view; 5b, medial view.
Figure 1. Lacerta s.l in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 1. Lacerta s.l. filholi, nearly complete left dentary, IRSNB R242, previously BOU-AR-27-RS. 1a, lateral view; 1b, medial view.
Figure 3 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 3. Scincoidea undetermined incomplete left dentary, lacking its anterior part, IRSNB R 244, previously BOU-AR-37-RS. 3a, lateral view; 3b, medial view.
Figure 10 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 10. Diversity and extinction of lizard groups in the late Eocene and early Oligocene of Europe.
Figure 8 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 8. Transitional and adult dentitions in Astyanax mexicanus. A, live fish – 65 days post-fertilization (dpf) (16.9 mm total length (TL)) showing premaxilla, with the first multicuspid teeth developing prior to replacing conical predecessors. Scale bar = 100 µm. B, cleared-and-stained fish – 163 dpf (41.8 mm TL). Asterisk indicates maxillary tooth. Scale bar = 1 mm.
Figure 5 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 5. Frequency distributions of tooth heights. Arrows indicate peaks corresponding to tooth replacement events, and to the plateaux in Fig. 3. A, only the single tallest tooth from each dentigerous bone. B, all measured teeth.
Figure 3 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 3. Sections through first (A, one month) and second (B, two months) generation oral teeth in Astyanax mexicanus. Scale bars = 50 µm.
Figure 11 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 11. Differences between successive tooth generations in terms of time (A), increase in fish total length (TL) (B) and increase in tooth height (C).
Figure 12 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 12. Multicuspid teeth in Astyanax mexicanus; sections through a 3-month individual. A, functional teeth (FT) and developing replacement tooth (RT) on the dentary (D). Scale bar = 100 µm. B, close-up of functional tooth showing odontoblasts (Od) grouped on the edge of the pulp cavity (PC); the paths of odontoblast process (dentinal tubules) through the dentine is apparent. Scale bar = 50 µm C, close-up of developing tooth germ, showing a single pulp cavity lined with odontoblasts as well as a continuous dentine-predentine junction (black arrows). Scale bar = 50 µm. D, section through another functional tooth, showing the continuous nature of the dentine-predentine junction (black arrows). Scale bar = 50 µm.
Data for: Modeling the transition of death assemblages through the mixed layer predicts a downcore increase in time averaging
<p>Understanding how time averaging changes during the burial is essential for using Holocene and Anthropocene cores to analyze ecosystem change, given the many ways in which the time averaging affects biodiversity measures. Here, we use transition-rate matrices to explore how time averaging changes downcore when shells transit through a taphonomically-complex mixed layer into permanently-buried historical layers: this is a null model, without any temporal changes in rates of sedimentation or bioturbation, to contrast with downcore patterns that might be produced by human activity. Assuming stochastic burial and exhumation movements of shells between increments within the mixed layer and stochastic disintegration within increments, almost all combinations of net sedimentation, mixing, and disintegration produce a downcore increase in time averaging (interquartile range, IQR), typically associated with a decrease in kurtosis and skewness and with a shift from right-skewed to symmetrical age distributions. A downcore increase in time averaging is a null expectation wherever bioturbation generates an internally-structured mixed layer (i.e., a surface well-mixed layer is underlain by an incompletely-mixed layer), so that shells are mixed throughout the entire mixed layer at slower rate than they are buried below it by sedimentation. This downcore trend created by mixing is further amplified by the downcore decline in disintegration rate. Using data from the southern California shelf, we find that transition-rate matrices accurately reproduce the downcore changes in IQR, skewness, and kurtosis observed in sediment cores. The right-skewed distributions typical of surface death assemblages – the focus of most actualistic research – might be fossilized under exceptional conditions of episodic anoxia or sudden burial. However, such right-skewed assemblages will not typically transfer into subsurface historical layers and thus will be geologically transient. The deep-time fossil record will be dominated instead by more time-averaged assemblages with weakly skewed age distributions that form in the lower parts of the mixed layer.</p>
Figure 12 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 12 Results of the cladistic analysis. Grey nodes denote Daspletosaurus, star denotes D. wilsoni, and numbers by each node are bootstrap support. Skull reconstruction represents the holotype of D. wilsoni, BDM 107 (known material in white). Full-size DOI: 10.7717/peerj.14461/fig-12
Figure 13 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 13 Time-calibrated sequence of Daspletosaurus chronospecies. Ages (left) are in Ma and are based on Carr et al. (2017) and Fowler (2017) for D. torosus and D. horneri. Representative skulls are, from top to bottom: D. horneri, MOR 590; D. wilsoni, BDM 107 (known material in white); D. torosus, CMN 8506. Stars represents the temporal position of adjacent specimens. Accompanying characters represent synapomorphies of progressively more exclusive clades represented by each taxon (e.g., D. wilsoni + more derived tyrannosaurines, D. horneri + more derived tyrannosaurines). No clear demarcations are drawn between taxa along the depicted lineage, given the relative paucity of specimens and the subjectivity intrinsic to species delineations of anagenetic lineages; ages of taxa are therefore imprecise. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-13
Figure 11 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 11 Right splenial of BDM 107. Shown in medial (A) and lateral (B) views. Abbreviations are as follows: dcs, dentary contact surface; mhf, mylohyoid foramen. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-11
Figure 9 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 9 Right quadrate of BDM 107. Shown in medial (A) and lateral (B) views. Abbreviations are as follows: op, orbital process; mc, mandibular condyles; po, pneumatic opening; pqf, paraquadrate foramen. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-9
Figure 7 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 7 Left squamosal of BDM 107. Shown in lateral (A), medial (B), and rostral (C) views. Abbreviations are as follows: cp, caudal process; ltf, laterotemporal fenestra; pcs, postorbital contact surface; po, pneumatic opening, qjp, quadratojugal process; rmm, rostromedial margin of pneumatic recess. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-7
Figure 8 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 8 Right quadratojugal of BDM 107. Shown in lateral (A) and medial (B) views. Abbreviations are as follows: dqc, dorsal quadrate contact; jr, jugal ramus; sc, squamosal contact; vqc, ventral quadrate contact. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-8
Figure 5 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 5 Left lacrimal of BDM 107. Shown in lateral (A), medial (B), and dorsal (C) views. Abbreviations are as follows: cpa, cornual process apex; fr, frontal ramus; po, pneumatic opening; rda, rostrodorsal ala; rr, rostral ramus; vp, ventral process; vr, ventral ramus. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-5
Figure 6 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 6 Left postorbital of BDM 107. Shown in lateral (A), dorsal (B), medial (C), caudal (D), and rostral (E) views. Abbreviations are as follows: cdt, caudodorsal tuberosity; dtf, dorsotemporal fossa; fc, frontal contact; lsc, laterosphenoid contact; sop, subocular process; sos, supraorbital shelf. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-6
Figure 3 in A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana
Figure 3 Left maxilla of BDM 107. Shown in lateral (A) and medial (B) views. Abbreviations are as follows: af, antorbital fossa; aof, antorbital fenestra; ma, maxillary antrum; mxf, maxillary fenestra; pmr, promaxillary recess; pmx, promaxillary fenestra; ps, palatal shelf; nf, neurovascular foramina; ns, neurovascular sulci. Scale is 10 cm. Full-size DOI: 10.7717/peerj.14461/fig-3
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.