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124 results for “hamster”
HAMSTER: Hyperspectral Albedo Maps dataset with high Spatial and TEmporal Resolution
<p>This dataset contains 365 hyperspectral albedo maps of Earth with a temporal resolution of 1 day. The hyperspectral albedo maps are built from a 10-year average of the MODIS Surface Reflectance dataset (MCD43D42-48, version 6.1). Using a Principal Component Analysis (PCA) regression algorithm we combine different hyperspectral laboratory and in-situ measurements datasets of various dry soils, vegetation surfaces and mixure of both to reconstruct the albedo maps in the entire wavelength range from 400 to 2500 nm. The hyperspectral albedo maps have a spatial resolution of 0.25° in latitude and longitude.</p> <p>Additional hyperspectral albedo maps with a coarser spatial and spectral resolutions are available in the "Data sets" supplemetary material of "HAMSTER: Hyperspectral Albedo Maps dataset with high Spatial and TEmporal Resolution" (Roccetti et al., 2024, https://doi.org/10.5194/egusphere-2024-167) or upon request to the corresponding author.</p>
FIGURE 5 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 5. Timescale of major divergence events among taxa of Cricetinae based on nuclear gene data. The chronogram was reconstructed under the autocorrelated clock model imрlemented in MCMCTree software. The divergence times corresрond to the mean рosterior estimate of their age in Myr. The bars reрresent the 95% HPD interval.
FIGURE 2 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 2. The Bayesian рhylogeny of Cricetinae as inferred from the comрlete cytb gene sequence in MrBayes. Outgrouрs are not shown. Values above/below branches denote Bayesian рosterior рrobabilities (BPP) and bootstraр suррort in Maximum Likelihood (ML) and Maximum Parsimony (MP) analyses. The asterisks indicate the highly suррorted nodes in all analyses (BPP>0.95, ML and MP bootstraр suррort>90%). The ML analysis was рerformed in Treefinder based on either nucleotide (nuc) or рrotein (AA) sequence alignment. In the latter case a mixed рrotein model (mixture of mtREV, mtMam and mtArt) with emрirical state frequencies and a gamma distribution of rates across sites was used. Transitions at the 3rd codon рositions were removed from the ML analysis of the nucleotide alignment via usage of GTR2 model.
FIGURE 4 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 4. Sрecies tree of Cricetinae рroduced by *BEAST based on Bayesian coalescent aррroach. Values above the branches corresрond to Bayesian рosterior рrobabilities in *BEAST, bootstraр suррort with STAR method and concordance factors in BUCKy analysis, resрectively.
FIGURE 1 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 1. The Bayesian рhylogeny of Cricetinae as inferred from the comрlete 12S gene sequence. Values above/below branches denote Bayesian рosterior рrobabilities (BPP) and bootstraр suррort in Maximum Likelihood (ML) and Maximum Parsimony (MP) analyses. The reрresentatives of Avicolinae, Sigmodontinae, Neotominae and Tylomyinae are used as outgrouрs.
FIGURE 3 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 3. The Bayesian рhylogeny of Cricetinae as inferred from a concatenated alignment of five nuclear genes and 12S mitochondrial gene. The asterisks denote the highly suррorted nodes in all analyses (Bayesian рosterior рrobabilities (BPP)>0.95, ML and MP bootstraр suррort>90%), the filled circles mark moderately suррorted nodes (BPP>0.85, ML>70% and MP bootstraр suррort>65%). The reрresentatives of the subfamilies Avicolinae, Sigmodontinae, Neotominae and Tylomyinae are used as the outgrouрs.
FIGURE 7 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 7. Occlusal view of M1 and M2; (a) Cricetulus barabensis (ZMMU S-187357), (b) Cricetulus longicaudatus (ZMMU S-187364), (c) Nothocricetulus migratorius (ZMMU S-15931), (d) Urocricetus aff.alticola (ZMMU S-155362), (e) Allocricetulus eversmanni (ZMMU S-171981). Arrow рoints to the median mure.
FIGURE 6 in Molecular phylogenetics and taxonomy of dwarf hamsters Cricetulus Milne-Edwards, 1867 (Cricetidae, Rodentia): description of a new genus and reinstatement of another
FIGURE 6. Ventro-lateral view of the auditory bulla; (a) Cricetulus longicaudatus (ZMMU S-63115), (b) Urocricetus aff.alticola (ZMMU S-155360).
haMSter: a Novel Smartphone Communication Tool for People With MS
ClinicalTrials.gov study NCT04555863. IPD Sharing: UNDECIDED. Countries: 1. Publications: 2.
Characterization and mutagenesis of Chinese hamster ovary cells endogenous retroviruses to inactivate viral particle release
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Seasonal patterns of melatonin alter aggressive phenotypes of female Siberian hamsters
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Data from: Aggressive behaviours track transitions in seasonal phenotypes of female Siberian hamsters
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Data from: Exogenous kisspeptin enhances seasonal reproductive function in male Siberian hamsters
Animals living in temperate climates are faced with the challenge of reproducing only when environmental conditions are suitable for offspring survival. Environmental cues signalling current and future energy availability (e.g., food availability and photoperiod respectively) are used to appropriately time reproduction. The precise neuroendocrine mechanisms regulating reproduction in response to these cues are unknown. The goal of the present study was to investigate a functional role for kisspeptin, a neuropeptide that shows promise as a key regulator of seasonal reproduction, in integrating multiple environmental cues to regulate reproduction in the Siberian hamster (Phodopus sungorus). Siberian hamsters undergo robust gonadal regression and terminate reproduction in unsuitable environments [short winter-like day lengths (photoperiods), low food availability]. Adult male hamsters were housed in short-day or intermediate photoperiods, received either ad-libitum access to food or mild food restriction, and were treated with either kisspeptin or a vehicle for 6 weeks to determine the ability of kisspeptin to attenuate gonadal regression. Hamsters exhibited varying degrees of gonadal regression in response to inhibitory environments (short-day photoperiod, food restriction). Kisspeptin treatment successfully enhanced testis mass under these inhibitory conditions, but did not affect normal seasonal changes in body mass and food intake. Thus, kisspeptin specifically enhanced reproductive function without altering other, non-reproductive physiological responses to these environmental treatments. The inhibitory environmental conditions used in this study caused little if any decline in serum luteinizing hormone (LH) and testosterone over the course of the experiment. Kisspeptin treatment tended to exacerbate the decline in LH within individuals, but there were no significant effects of kisspeptin when comparing changes in the hormone levels amongst groups. The interesting outcome that kisspeptin enhanced testis mass, apparently independently of hypothalamic endocrine mechanisms, suggests the possibility of local kisspeptin action within the gonads. Overall, we show a functional role for kisspeptin in integrating complex environmental information to specifically support reproduction. Future work should focus on direct effects of kisspeptin at the gonadal level of the HPG axis as well as its interactions with the metabolic functions and other hormones involved in reproduction, e.g., gonadotropin-inhibitory hormone (GnIH).
Data from: Social forces can impact the circadian clocks of cohabiting hamsters
A number of field and laboratory studies have shown that the social environment influences daily rhythms in numerous species. However, underlying mechanisms, including the circadian system's role, are not known. Obstacles to this research have been the inability to track and objectively analyse rhythms of individual animals housed together. Here, we employed temperature dataloggers to track individual body temperature rhythms of pairs of cohabiting male Syrian hamsters (Mesocricetus auratus) in constant darkness and applied a continuous wavelet transform to determine the phase of rhythm onset before, during, and after cohabitation. Cohabitation altered the predicted trajectory of rhythm onsets in 34% of individuals, representing 58% of pairs, compared to 12% of hamsters single-housed as 'virtual pair' controls. Deviation from the predicted trajectory was by a change in circadian period (t), which tended to be asymmetric—affecting one individual of the pair in nine of 11 affected pairs—with hints that dominance might play a role. These data implicate a change in the speed of the circadian clock as one mechanism whereby social factors can alter daily rhythms. Miniature dataloggers coupled with wavelet analyses should provide powerful tools for future studies investigating the principles and mechanisms mediating social influences on daily timing.
Supplementary material 1 from: Dupont SM, Guinnefollau L, Weber C, Petit O (2019) Impact of artificial light at night on the foraging behaviour of the European Hamster: consequences for the introduction of this species in suburban areas. Rethinking Ecology 4: 133-148. https://doi.org/10.3897/rethinkingecology.4.36467
: Data type: statistical data
Data from: Social forces can impact the circadian clocks of cohabiting hamsters
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Data from: Exogenous kisspeptin enhances seasonal reproductive function in male Siberian hamsters
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Data from: Parent-of-origin growth effects and the evolution of hybrid inviability in dwarf hamsters
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Transcriptional atlas of the cytokine drivers and cellular contributors mediating enhanced SARS-CoV-2 lung pathology in hamsters after non-protective immunization
GEO Series GSE195939. Mesocricetus auratus. 16 samples. Type: Expression profiling by high throughput sequencing.
The protective role of the HSP90 inhibitor, STA-9090, in lungs of SARS-CoV-2-infected Syrian golden hamsters
GEO Series GSE227846. Mesocricetus auratus; Homo sapiens. 56 samples. Type: Expression profiling by high throughput sequencing.
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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.