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2,142 results for “by contact”
Transmission Dynamics of COVID-19 Disease among household contacts in Delhi, India (SARS CoV-2 HT Study)
<p>Results from households in the MAMC Delhi FFX Unity study </p>
Do habitat and elevation promote hybridization during secondary contact between three genetically distinct groups of warbling vireo (Vireo gilvus)?
<p>Following postglacial expansion, secondary contact can occur between genetically distinct lineages. These genetic lineages may be associated with specific habitat or environmental variables and therefore, their distributions in secondary contact could reflect such conditions within these areas. Here we used mtDNA, microsatellite, and morphological data to study three genetically distinct groups of warbling vireo (Vireo gilvus) and investigate the role that elevation and habitat play in their distributions. We studied two main contact zones and within each contact zone, we examined two separate transects. Across the Great Plains contact zone, we found that hybridization between eastern and western groups occurs along a habitat and elevational gradient, whereas hybridization across the Rocky Mountain contact zone was not as closely associated with habitat or elevation. Hybrids in the Great Plains contact zone were more common in transitional areas between deciduous and mixed-wood forests, and at lower elevations (<1000 m). Hybridization patterns were similar along both Great Plains transects indicating that habitat and elevation play a role in hybridization between distinct eastern and western genetic groups. The observed patterns suggest adaptation to different habitats, perhaps originating during isolation in multiple Pleistocene refugia, is facilitating hybridization in areas where habitat types overlap.</p>
CoMix social contact data (Slovenia)
<p>CoMix social contact data for Slovenia.</p> <p>We gratefully acknowledge the efforts of all teams involved in the implementation of the CoMix study in their country. More specifically: the team of Petra Klepac at the National Institute of Public Health.</p>
CoMix social contact data (Spain)
<p>CoMix social contact data for Spain.</p> <p>We gratefully acknowledge the efforts of all teams involved in the implementation of the CoMix study in their country. More specifically: the team of Cristina Vilaplana at the Institute for Health Science Research Germans Trias i Pujol (IGTP) that acknowledges support from the SMA-TB Project from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 847762.</p>
Subspecies and Distribution. P.v.vitulinaLinnaeus,1758—NEAtlanticOceanincludingSvalbardStoNWFrance(Brittany),withoccasionalsightingsasfarSasNPortugal;Wboundaryuncertain,perhapsIceland. P.v.concolorDeKay,1842—NWAtlanticOcean,frommid-AtlanticUSAtotheCanadianArcticandEtoGreenland;Eboundaryuncertain,perhapsIceland. P. v. richardGray, 1864 — NE Pacific Ocean, from Aleutian Is through the Gulf of Alaska (including Iliamna Lake) S to the coast of Baja California (N Mexico); contact zone with stejnegert may occur in W Alaska Peninsula-E Aleutian Is. P. v. stejnegeri Allen, 1902 — NW Pacific Ocean along the coast of Russian Far East, from Kamchatka, the Kuril Is to N Japan (Hokkaido) and E to the Aleutian Is; contact zone with richardii may occur in E Aleutian Is—W Alaska Peninsula. in Phocidae
Subspecies and Distribution. P.v.vitulinaLinnaeus,1758—NEAtlanticOceanincludingSvalbardStoNWFrance(Brittany),withoccasionalsightingsasfarSasNPortugal;Wboundaryuncertain,perhapsIceland. P.v.concolorDeKay,1842—NWAtlanticOcean,frommid-AtlanticUSAtotheCanadianArcticandEtoGreenland;Eboundaryuncertain,perhapsIceland. P. v. richardGray, 1864 — NE Pacific Ocean, from Aleutian Is through the Gulf of Alaska (including Iliamna Lake) S to the coast of Baja California (N Mexico); contact zone with stejnegert may occur in W Alaska Peninsula-E Aleutian Is. P. v. stejnegeri Allen, 1902 — NW Pacific Ocean along the coast of Russian Far East, from Kamchatka, the Kuril Is to N Japan (Hokkaido) and E to the Aleutian Is; contact zone with richardii may occur in E Aleutian Is—W Alaska Peninsula.
Distribution. NE Bolivia (throughout much of lowland Bolivia E of the Rio Manique) and W Brazil (S Rondonia State at least as far W as the upper Rio Jiparana). S limits are unclear, but it occurs in the vicinity of the Bolivian city of Santa Cruz and may contact or intergrade with the distribution of the Pale Titi (C. pallescens) in SE Bolivia; in Rondonia, it may occur as far N as the Serra dos Pacaas Novos, where there may be a contact zone with the Brown Titi (C. brunneus) or Prince Bernhard's Titi (C. bernhardi); the S and E limits ofits distribution in Brazil are unclear, but they may be ecologically constrained by inappropriate habitats in the Brazilian cerrado savannas to the S, and possible contact zones with Prince Bernhard's Titi (which is now known to occur to the W of the Rio Jiparana) and the Ashy Titi (C. cinerascens) in the E. in Phitheciidae
Distribution. NE Bolivia (throughout much of lowland Bolivia E of the Rio Manique) and W Brazil (S Rondonia State at least as far W as the upper Rio Jiparana). S limits are unclear, but it occurs in the vicinity of the Bolivian city of Santa Cruz and may contact or intergrade with the distribution of the Pale Titi (C. pallescens) in SE Bolivia; in Rondonia, it may occur as far N as the Serra dos Pacaas Novos, where there may be a contact zone with the Brown Titi (C. brunneus) or Prince Bernhard's Titi (C. bernhardi); the S and E limits ofits distribution in Brazil are unclear, but they may be ecologically constrained by inappropriate habitats in the Brazilian cerrado savannas to the S, and possible contact zones with Prince Bernhard's Titi (which is now known to occur to the W of the Rio Jiparana) and the Ashy Titi (C. cinerascens) in the E.
Subspecies and Distribution. P.v. volans Kerr, 1792 — E Australia, from Bundaberg on the SE Queensland coast and the C New South Wales coast S to Orange and Port Macquarie/Bulga Plateau. P v. incanus Thomas, 1923 — SE Australia, including parts of New South Wales (N to upper Hunter Valley) and Victoria. Distributions of volans and incanus appear to overlap or at least interdigitate, but the nature of the contact zone is unknown. in Pseudocheiridae
Subspecies and Distribution. P.v. volans Kerr, 1792 — E Australia, from Bundaberg on the SE Queensland coast and the C New South Wales coast S to Orange and Port Macquarie/Bulga Plateau. P v. incanus Thomas, 1923 — SE Australia, including parts of New South Wales (N to upper Hunter Valley) and Victoria. Distributions of volans and incanus appear to overlap or at least interdigitate, but the nature of the contact zone is unknown.
How to make ME contact in solid configuration
<p>These schematics show how the contact can be made for a solid-state magneto-electric system. As an example, there is a FeGa/IrMn system grown on a piezoelectric PVDF-TrFE substrate. </p>
Variable hybridization between two Lake Tanganyikan cichlid species in recent secondary contact
<p>Closely related taxa frequently exist in sympatry before the evolution of robust reproductive barriers, which can lead to substantial gene flow. Post-divergence gene flow can promote several disparate trajectories of divergence ranging from the erosion of distinctiveness and eventual collapse of the taxa to the strengthening of reproductive isolation. Among many relevant factors, understanding the demographic history of divergence (e.g. divergence time, extent of historical gene flow) can be particularly informative when examining contemporary gene flow between closely related taxa because this history can influence gene flow’s prevalence and consequences. Here, we used genotyping-by-sequencing data to investigate speciation and contemporary hybridization in two closely related and sympatrically distributed Lake Tanganyikan cichlid species in the genus <em>Petrochromis</em>. Demographic modeling supported a speciation scenario involving divergence in isolation followed by secondary contact with bidirectional gene flow. Further investigation of this recent gene flow found evidence of ongoing hybridization between the species that varied in extent between different co-occurring populations. Relationships between abundance and the degree of admixture across populations suggest that the availability of conspecific mates may influence patterns of hybridization. These results, together with the observation that sets of recently diverged cichlid taxa are generally geographically separated in the lake, suggest that ongoing speciation in Lake Tanganyikan cichlids relies on initial spatial isolation. Additionally, the spatial heterogeneity of admixture between the <em>Petrochromis</em> species illustrates the complexities of hybridization when species are in recent secondary contact.</p>
Dataset of "Graphite lubrication of highly loaded contacts: humidity-dependent friction and structural transition to turbostratic carbon"
<p>Initial atomic configurations for DFTB-MD simulations (Fig. 8-10, Fig. S7).</p>
RADseq data reveal a lack of admixture in a mouse lemur contact zone contrary to previous microsatellite results
<p>Microsatellites have been a workhorse of evolutionary genetic studies for decades and are still commonly in use for estimating signatures of genetic diversity at the population and species level across a multitude of taxa. Yet, the very high mutation rate of these loci is a double-edged sword, conferring great sensitivity at shallow levels of analysis (e.g., paternity analysis) but yielding considerable uncertainty for deeper evolutionary comparisons. For the present study, we used reduced representation genome-wide data (RADseq) to test for patterns of interspecific hybridization previously characterized using microsatellite data in a contact zone between two closely related mouse lemur species in Madagascar (<em>Microcebus murinus</em> and <em>M</em>. <em>griseorufus</em>). We revisit this system by examining populations in, near, and far from the contact zone, including many of the same individuals that had previously been identified as hybrids with microsatellite data. Surprisingly, we find no evidence for admixed nuclear ancestry. Instead, re-analyses of microsatellite data and simulations suggest that previously inferred hybrids were false positives and that the program NewHybrids can be particularly sensitive to erroneously inferring hybrid ancestry. Combined with results from coalescent-based analyses and evidence for local syntopic co-occurrence, we conclude that the two mouse lemur species are in fact completely reproductively isolated, thus providing a cautionary tale for the inference of interspecific hybridization with microsatellite data.</p>
Supplementary data and files for: The importance of contact zones for distinguishing interspecific from intraspecific geographic variation
<p>With limited sampling, geographic variation within a single species can be difficult to distinguish from interspecific variation, confounding our ability to draw accurate species boundaries. We argue that thorough sampling and analysis of contact zones between putative taxa can determine if assortative mating or selection against hybrids exists (supporting the presence of two distinct species), or alternatively if mating is random among genotypes and admixture among adjacent populations is gradual and continuous (supporting geographic variation within a single species). Here, we test two alternative hypotheses for two pairs of named taxa at contact zones within the American milksnake (<em>Lampropeltis triangulum</em>) complex. A prior morphological analysis found areas of gradual intergradation among named taxa, and concluded that the taxa represented geographical races of a single polytypic species. In contrast, a subsequent analysis of gene sequence data, but with limited sampling near the contact zones, hypothesized distinct boundaries between species at the contact zones. At the contact zone between proposed species <em>L. triangulum </em>and <em>L. gentilis</em>, we examined a ~700 km-wide transect across the states of Kansas and Missouri, with thorough sampling and reduced-representation genomic-level sequencing, to test the two opposing taxonomic hypotheses. Our transect analyses included examinations of population structure, fixed differences, cline-fitting, and an admixture index analysis. These analyses all supported a gradual and continuous geographic cline across a broad intergrade zone between two geographic forms of <em>L. triangulum</em>, thus providing strong support for a single species in this region (and no support for the recognition of <em>L. gentilis </em>as a distinct species). At a second contact zone between proposed species <em>L. triangulum </em>and <em>L. elapsoides </em>(but variously treated as species or subspecies by different researchers) in Kentucky and Tennessee, we re-evaluated morphological data. In this case, the contact zone analysis indicated sympatry and reproductive isolation of the two taxa, and thus strongly supported <em>L. triangulum </em>and <em>L. elapsoides </em>as distinct species. We conclude that detailed studies of contact zones, based on either genetic or morphological data, are essential for distinguishing intraspecific from interspecific variation in the case of widely and continuously distributed taxa.</p>
Contact Period Pipe Bowl
A decorated Contact period tobacco pipe bowl recovered during the excavation of a site along the Susquehanna River in Cecil County, Maryland by Richard Stearns and the Natural History Society of Maryland in 1943. Courtesy of the Natural History Society of Maryland which has given permission for the model to be downloadable for non-commercial educational purposes. Source: Objaverse 1.0 / Sketchfab
On the role of native contact cooperativity in protein folding
<p>This repository provides supporting information related to the paper "On the role of contact cooperativity in protein folding" by Wang, Frechette and Best ( <a href="https://doi.org/10.1073/pnas.2319249121">https://doi.org/10.1073/pnas.2319249121</a> ) and contains: </p> <ol> <li>C++ code using Boltzmann machines to learn the parameters of an Ising model that best describes contact formation observed in an MD simulation. </li> <li>The fitted parameters and python scripts used for plotting several of the figures in the paper.</li> </ol>
Data for "Evaluating disease surveillance strategies for early outbreak detection in contact networks with varying community structure"
<p>New York City contact network data used in the publication “<a href="https://doi.org/10.1016/j.socnet.2024.06.003">Evaluating disease surveillance strategies for early outbreak detection in contact networks with varying community structure</a>” (LA-UR-23-26868). This contact network comes in the form of a weighted edge list. Each row describes an edge, with the first and second column containing the labels of the nodes connected by the edge, and the third column contains the corresponding weight of the edge. In this network, an edge encodes an interaction between two individuals and the weight describes the duration of the interaction in seconds. In total the edge list describes 6,376,729,847 interactions among 6,813,615 individuals; the first 10 interactions are listed below as an example.</p> <p>2, 1, 84121<br>4, 3, 83654.4<br>5, 3, 79591.4<br>5, 4, 87642<br>6, 3, 79853<br>6, 4, 81604<br>6, 5, 79146<br>8, 7, 80604<br>10, 9, 84259.6<br>12, 11, 68990.8</p> <p> </p> <p>This work is approved for public distribution under LA-UR-24-25046.</p>
school_contact_survey_2022
<p>Data for school-based contact survey conducted in 2022</p>
Osh4 Membrane Contact Site Model 2024 (Klauda Lab)
<p>This is a set of NAMD trajectory files and associated PSF files (final PDB files) for two membrane contact site models associated with our journal manuscript. </p>
Dataset for time evolution of classical contact process with 100 sites
Open the record for dataset details and reuse information.
Supporting data for "Prospects of silicide contacts for silicon quantum electronic devices"
Open the record for dataset details and reuse information.
Data Related to "Charge-Transfer Contacts for the Measurement of Correlated States in Monolayer WSe2"
<p>Data related to "Charge-Transfer Contacts for the Measurement of Correlated States in Monolayer WSe2"</p>
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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.