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481 results for “freezing”
Data from: Population structure, genetic variation and linkage disequilibrium in perennial ryegrass populations divergently selected for freezing tolerance
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Freeze-tolerance of poleward-spreading mangrove species weakened by soil properties of resident salt marsh competitor
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Fine root biogenic silica in sugar maple trees (Acer saccharum) on soil freezing and control plots at the Hubbard Brook Experimental Forest
This dataset presents biogenic silica (BSi) concentrations in sugar maple (Acer saccharum) fine roots collected from a snow manipulation experiment at Hubbard Brook Experimental Forest (New Hampshire, USA). BSi data are reported as percent dry biomass. The samples were collected from control and treatment plots in April 2009, May 2009, and April through July 2010. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Freezing mouse
Drawing uploaded to scidraw.io on: 28 May 2020
Distinct patterns of brain Fos expression in Carioca High- and Low-conditioned Freezing Rats
<p><span><b>Background</b> </span></p> <p><span>The bidirectional selection of high and low anxiety-like behavior is a valuable tool for understanding the neurocircuits that are responsible for anxiety disorders. Our group developed two breeding lines of rats, known as Carioca High- and Low-conditioned Freezing (CHF and CLF), based on defensive freezing in the contextual fear conditioning paradigm. A random selected line was employed as a control (CTL) comparison group for both CHF and CLF lines of animals. The present study performed Fos immunochemistry to investigate changes in neural activity in different brain structures among CHF and CLF rats when they were exposed to contextual cues that were previously associated with footshock. </span></p> <p><span> </span></p> <p><span><b>Results</b></span></p> <p><span>The study indicated that CHF rats expressed high Fos expression in the locus coeruleus, periventricular nucleus of the hypothalamus (PVN), and lateral portion of the septal area and low Fos expression in the medial portion of the septal area, dentate gyrus, and prelimbic cortex (PL) compared to CTL animals. CLF rats exhibited a decrease in Fos expression in the PVN, PL, and basolateral nucleus of the amygdala and increase in the cingulate and perirhinal cortices compared to CTL animals. </span></p> <p><span> </span></p> <p><span><b>Conclusions</b></span></p> <p><span>Both CHF and CLF rats displayed Fos expression changes key regions of the anxiety brain circuitry. The two bidirectional lines exhibit different pattern of neural activation and inhibition with opposing influences on the PVN, the main structure involved in regulating the hypothalamic–pituitary–adrenal neuroendocrine responses observed in anxiety disorders.</span></p>
Data from: Phenotypic plasticity, but not adaptive tracking, underlies seasonal variation in post-cold hardening freeze tolerance of Drosophila melanogaster
<p> In temperate regions, an organism's ability to rapidly adapt to seasonally varying environments is essential for its survival. In response to seasonal changes in selection pressure caused by variation in temperature, humidity, and food availability, some organisms exhibit plastic changes in phenotype. In other cases, seasonal variation in selection pressure can rapidly increase the frequency of genotypes that offer survival or reproductive advantages under the current conditions. Little is known about the relative influences of plastic and genetic changes in short lived organisms experiencing seasonal environmental fluctuations. Cold hardening is a seasonally relevant plastic response in which exposure to cool, but nonlethal, temperatures significantly increases the organism's ability to later survive at freezing temperatures. In the present study, we demonstrate seasonal variation in cold hardening in <em>Drosophila melanogaster</em> and test the extent to which plasticity and adaptive tracking underlie that seasonal variation. We measured the post-cold hardening freeze tolerance of flies from outdoor mesocosms over the summer, fall, and winter. We bred outdoor mesocosm-caught flies for two generations in the lab and matched each outdoor cohort to an indoor control cohort of similar genetic background. We cold hardened all flies under controlled laboratory conditions and then measured their post-cold hardening freeze tolerance. Comparing indoor and field-caught flies and their laboratory-reared G1 and G2 progeny allowed us to determine the roles of seasonal environmental plasticity, parental effects, and genetic changes on cold hardening. We also tested the relationship between cold hardening and other factors, including age, developmental density, food substrate, presence of antimicrobials, and supplementation with live yeast. We found strong plastic responses to a variety of field- and lab-based environmental effects, but no evidence of seasonally varying parental or genetic effects on cold hardening. We therefore conclude that seasonal variation in post-cold hardening freeze tolerance results from environmental influences and not genetic changes. </p>
Freezing nucleus spectra for hailstone samples in China from droplet freezing experiments—Data
<p>INP concentrations in hailstone samples from droplet freezing experiments.</p>
Drop freezing experiments
<p>Set of drop freezing experiments performed on Saharan dust.</p>
Premelting theory-based mechanism for water freezing in saline soil
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T2 spectrum of Shanghai muddy clay under freezing conditions at ultra-low temperature
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In situ μ-CT measurements during freeze-drying offers detailed information
<p>In situ μ-CT measurements during freeze-drying offers detailed information</p>
Fig. 4 in Length correction for early-juvenile Brazilian herring Sardinella janeiro (Eigenmann, 1894) after preservation in formalin, ethanol and freezing
Fig. 4. The relationship between fresh total length and relative (%) shrinkage in body mass after 60 days of preservation for early-juvenile of Sardinella janeiro. (a) Freezing (open triangle), (b) 2.5% formalin (full circle), 5% formalin (open circle), (c) 70% ethanol (full square) and 95% ethanol (open square).
Figure 4 from: Espinasa L, McCahill A, Kavanagh A, Espinasa J, Scott AM, Cahill A (2015) A troglobitic amphipod in the Ice Caves of the Shawangunk Ridge: Behavior and resistance to freezing. Subterranean Biology 15: 69-78. https://doi.org/10.3897/subtbiol.15.4733
Figure 4 - Specimen of Stygobromus allegheniensis frozen in a solid block of ice. Specimens were alive and behaved normally when thawed up to two hours after being frozen.
Figure 3 from: Espinasa L, McCahill A, Kavanagh A, Espinasa J, Scott AM, Cahill A (2015) A troglobitic amphipod in the Ice Caves of the Shawangunk Ridge: Behavior and resistance to freezing. Subterranean Biology 15: 69-78. https://doi.org/10.3897/subtbiol.15.4733
Figure 3 - Temperature preference of the amphipods inhabiting Ice Cave #1. When presented with a water temperature gradient, specimens spent most of the time swimming in water at 14.4 °C. Specimens showed a strong and immediate aversion to temperatures higher than about 18.5 °C, but not to low temperatures, with specimens walking directly on ice.
Figure 2 from: Espinasa L, McCahill A, Kavanagh A, Espinasa J, Scott AM, Cahill A (2015) A troglobitic amphipod in the Ice Caves of the Shawangunk Ridge: Behavior and resistance to freezing. Subterranean Biology 15: 69-78. https://doi.org/10.3897/subtbiol.15.4733
Figure 2 - Adult and juvenile specimens of Stygobromus allegheniensis from Ice Cave #1 at Sam's Point Preserve. Gravid females have been found in this cave, indicating that they are reproducing in this environment. The species is fully depigmented, eyeless, with long appendages, typical of cave-adapted organisms. During the warm months they can be found in the pools and small streams in the tectonic caves of the Shawangunk Ridge.
Figure 1 from: Espinasa L, McCahill A, Kavanagh A, Espinasa J, Scott AM, Cahill A (2015) A troglobitic amphipod in the Ice Caves of the Shawangunk Ridge: Behavior and resistance to freezing. Subterranean Biology 15: 69-78. https://doi.org/10.3897/subtbiol.15.4733
Figure 1 - The Ice Caves at Sam's Point Preserve, NY. Environmental conditions become challenging for the survival of aquatic troglobionts during the winter months. A–B Entrance to Ice Cave #1 in summer (A) and winter (B) C Deep lake in Ice Cave #2 during the Summer D Frozen floor in Ice Cave #3 on winter E Walls in Ice Cave #1 become covered in ice during the winter, eventually blocking the passage to its deeper chambers.
Regenafil Versus Demineralized Freeze Dried Bone Allograft (DFDBA) for Periodontal Defects
ClinicalTrials.gov study NCT00255970. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Etiology-Phenotype-Outcome Pathway Study on Freezing of Gait (FOG)
ClinicalTrials.gov study NCT07386015. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Understanding Freezing of Gait Using Brain Signals and Virtual Reality
ClinicalTrials.gov study NCT07092995. IPD Sharing: YES. Countries: 1. Publications: 0.
Transcranial Direct Current Stimulation for Freezing of Gait
ClinicalTrials.gov study NCT02266004. IPD Sharing: NO. Countries: 1. Publications: 0.
ScienceDex guides
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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.