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75 results for “Acclimatization”
Table 2 in Germination and acclimatization of Melocactus sergipensis Taylor & Meiado
<p><b>Table 2.</b> <i>In vitro</i> germination and growth of the <i>M. sergipensis</i> seedlings 90 days after planting in a greenhouse. Values in the same column followed by different letters (A or B) are significantly different (p <0.05) from each other according to Tukey’s <i>post hoc</i> test.</p><table><tbody><tr><th>Treatment</th><th>Germinatin rate (%)</th><th>Index germination velocity (IGV)</th><th>Survival (%)</th><th>Stem length (cm)</th><th>Stem Diameter (mm)</th><th>Radicle Length (cm)</th><th>Fresh weight (g)</th></tr></tbody><tbody><tr><th>T0</th><td>86 A</td><td>0.59 A</td><td>100 A</td><td>0.77 A</td><td>5.10 A</td><td>1.18 A</td><td>0.12 B</td></tr><tr><th>T1</th><td>82 A</td><td>0.41 A</td><td>100 A</td><td>0.65 A</td><td>5.0 A</td><td>1.11 A</td><td>0.11 B</td></tr><tr><th>T2</th><td>92 A</td><td>0.46 A</td><td>100 A</td><td>0.71 A</td><td>5.0 A</td><td>1.48 A</td><td>0.16 A</td></tr></tbody></table><p>T0 = untreated seeds (control), T1 = seeds soaked in distilled water for 6 hours; T2 = seeds soaked in 2 mg L- <sup>1</sup> GA for 6 hours.</p><p><sub>3</sub></p>
Table 1 in Germination and acclimatization of Melocactus sergipensis Taylor & Meiado
<p><b>Table 1.</b> <i>In vitro</i> germination and development of <i>M. sergipensis</i> seedlings 90 days after inoculation.Values in the same column followed by different letters (A or B) are significantly different (p <0.05) from each other, based on Tukey’s <i>post hoc</i> test.</p><table><tbody><tr><th>Treatment</th><th>Germination rate (%)</th><th>Index of germination velocity (IGV)</th><th>Survival (%)</th><th>Stem length (cm)</th><th>Stem diameter (mm)</th><th>Radicle length (cm)</th><th>Fresh weight (g)</th></tr></tbody><tbody><tr><th>T0</th><td>10B</td><td>0.04 A</td><td>100 A</td><td>1.05 A</td><td>4.24 A</td><td>1.41 A</td><td>0.14 A</td></tr><tr><th>T1</th><td>30 AB</td><td>0.16 A</td><td>100 A</td><td>0.97 A</td><td>4.92 A</td><td>1.20 A</td><td>0.15 A</td></tr><tr><th>T2</th><td>38A</td><td>0.09 A</td><td>100 A</td><td>0.98 A</td><td>4.76 A</td><td>1.26 A</td><td>0.13 A</td></tr></tbody></table><p>T0 = untreated seeds (control); T1 = seeds soaked in distilled water for 6 hours; T2 = seeds soaked in 2 <sup>mgL-1</sup> GA</p><p>for 6 hours.</p>
Table 3 in Germination and acclimatization of Melocactus sergipensis Taylor & Meiado
<p><b>Table 3.</b> <i>Ex situ</i> growth of <i>M. sergipensis</i> seedlings in distinct substrates after 60 days of acclimatization. Values in the same column followed by different letters (A or B) are significantly different (p <0.05) from each other according to Tukey’s <i>post hoc</i> test.</p><table><tbody><tr><th>Treatment</th><th>Survival (%)</th><th>Stem Length (cm)</th><th>Stem Diameter (mm)</th><th>Radicle Length (cm)</th><th>Fresh weight (g)</th></tr></tbody><tbody><tr><th>T1</th><td>100 A</td><td>1.63 A</td><td>6.5 AB</td><td>0.80 A</td><td>0.30 AB</td></tr><tr><th>T2</th><td>96 A</td><td>1.71 A</td><td>7.2 A</td><td>0.96 A</td><td>0.41 A</td></tr><tr><th>T3</th><td>88 A</td><td>1.64 A</td><td>6.5 AB</td><td>0.51 A</td><td>0.34 AB</td></tr><tr><th>T4</th><td>92 A</td><td>1.50 A</td><td>5.8 B</td><td>0.74 A</td><td>0.29 B</td></tr></tbody></table><p>T1 = Caatinga soil; T2 = Atlantic Forest soil; T3 = humus; T4 = humus + washed sand (1:1 w/w).</p>
Rapid Acclimatization to Hypoxia at Altitude
ClinicalTrials.gov study NCT01702025. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Synchronization of seasonal acclimatization and short-term heat hardening improves physiological resilience in a changing climate
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Dataset S1: Results of modeled spectral competition between Synechococcus type IV chromatic acclimaters (CA4) and blue and green light-harvesting specialists
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Data from: The genome and phenome of the green alga Chloroidium sp. UTEX 3007 reveal adaptive traits for desert acclimatization
To investigate the phenomic and genomic traits that allow green algae to survive in deserts, we characterized a ubiquitous species, Chloroidium sp. UTEX 3007, which we isolated from multiple locations in the United Arab Emirates (UAE). Metabolomic analyses of Chloroidium sp. UTEX 3007 indicated that the alga accumulates a broad range of carbon sources, including several desiccation tolerance-promoting sugars and unusually large stores of palmitate. Growth assays revealed capacities to grow in salinities from zero to 60 g/L and to grow heterotrophically on >40 distinct carbon sources. Assembly and annotation of genomic reads yielded a 52.5 Mbp genome with 8153 functionally annotated genes. Comparison with other sequenced green algae revealed unique protein families involved in osmotic stress tolerance and saccharide metabolism that support phenomic studies. Our results reveal the robust and flexible biology utilized by a green alga to successfully inhabit a desert coastline.
Physiological acclimatization in high-latitude zooplankton
<p>How individual organisms adapt to non-optimal conditions through physiological acclimatization is central to predicting the consequences of unusual abiotic and biotic conditions such as those produced by marine heat waves. The Northeast Pacific, including the Gulf of Alaska experienced an extreme warming event (2014-2016, "The Blob") that affected all trophic levels leading to large-scale changes in the community. The marine copepod <i>Neocalanus flemingeri</i> is one key member of the subarctic Pacific pelagic ecosystem. During the spring phytoplankton bloom this copepod builds substantial lipid stores as it prepares for its non-feeding adult phase. A three-year comparison of gene expression profiles of copepods collected in Prince William Sound in the Gulf of Alaska between 2015 and 2017 included two high-temperature years (2015 and 2016) and one year with very low phytoplankton abundances (2016). The largest differences in gene expression were between high and low chlorophyll years, and not between warm and cool years. The observed gene expression patterns are indicative of physiological acclimatization. The predominant signal in 2016 was the down-regulation of genes involved in glycolysis and its incoming pathways, consistent with the modulation of metabolic rates in response to prolonged low food conditions. Despite the down-regulation of genes involved in metabolism, there was no evidence of suppression of protein synthesis based on gene expression or behavioral activity. Genes involved in muscle function were up-regulated, and the copepods were actively swimming and responsive to stimuli at collection. However, genes involved in fatty acid metabolism were down-regulated in 2016, suggesting reduced lipid accumulation. </p>
Raman data for "Resistance to ocean acidification in coral reef taxa is not gained by acclimatization"
<p>This file contains the Raman data and code for "Resistance to ocean acidification in coral reef taxa is not gained by acclimatization" by Comeau et al. in Nature Climate Change. Run the file, "run.R" in R to reproduce the analysis.</p> <p>Please see the published paper for methods and details: https://doi.org/10.1038/s41558-019-0486-9</p>
Membrane lipid metabolism, heat shock response, and energy costs mediate the interaction between acclimatization and heat hardening response
<p>Thermal plasticity on different timescales, including acclimation/acclimatization and heat hardening response – a rapid adjustment for thermal tolerance after a nonlethal thermal stress, can interact on organisms to improve the resilience to thermal stress. However, little is known about the physiological mechanisms mediating this interaction. To investigate underpinnings of heat hardening responses after acclimatization in warm season, we measured thermal tolerance plasticity, compared transcriptomic and metabolomic changes after heat hardening at 33 or 37<sup>o</sup>C followed by recovery of 3 h or 24 h in an intertidal bivalve <i>Sinonovacula constricta</i>. The clams showed explicit heat hardening responses after acclimatization in warm season. The higher inducing temperature (37<sup>o</sup>C) caused a less effective heat hardening effect than the inducing temperature that was closer to seasonal maximum temperature (33<sup>o</sup>C). Metabolomic analysis highlighted the elevated contents of membrane glyceropholipids in all heat hardened clams, which may help to maintain structure and function of membrane. Heat shock proteins (HSPs) tended to be up-regulated after heat hardening at 37<sup>o</sup>C but not at 33<sup>o</sup>C, indicating that there was no complete dependency of heat hardening effects on up-regulated HSPs. Enhanced energy metabolism and decreased energy reserves were observed after heat hardening at 37<sup>o</sup>C, suggesting more energy costs during exposure to higher inducing temperature which may restrict heat hardening effects. These results highlighted the mediating role of membrane lipid metabolism, heat shock responses and energy costs in the interaction of heat hardening response and seasonal acclimatization, and benefit the mechanistic understanding of evolutionary change and thermal plasticity during global climate change.</p>
Effect of Water Biking in Hot Versus Neutral Water for Heat Acclimatation
ClinicalTrials.gov study NCT05727774. IPD Sharing: Not stated. Countries: 1. Publications: 7.
Substrate Utilization, Exercise Performance, and Skeletal Muscle Response to Energy Deficit and Altitude Acclimatization
ClinicalTrials.gov study NCT02731066. IPD Sharing: UNDECIDED. Countries: 1. Publications: 3.
Effect of High Altitude Exposure, Acclimatization and Re-exposure on Nocturnal Breathing Pattern in Lowlanders
ClinicalTrials.gov study NCT02730143. IPD Sharing: NO. Countries: 1. Publications: 1.
Coping with the worst of both worlds: phenotypic adjustments for cold acclimatization benefit northward migration and arrival in the cold in an Arctic breeding songbird
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Data from: Functional genomic analysis of corals from natural CO2-seeps reveals core molecular responses involved in acclimatization to ocean acidification
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Data from: The genome and phenome of the green alga Chloroidium sp. UTEX 3007 reveal adaptive traits for desert acclimatization
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Membrane lipid metabolism, heat shock response, and energy costs mediate the interaction between acclimatization and heat hardening response
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Physiological acclimatization in high-latitude zooplankton
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Data from: Strong costs and benefits of winter acclimatization in Drosophila melanogaster
Studies on thermal acclimation in insects are often performed on animals acclimated in the laboratory under conditions that are not ecologically relevant. Costs and benefits of acclimation responses under such conditions may not reflect costs and benefits in natural populations subjected to daily and seasonal temperature fluctuations. Here we estimated costs and benefits in thermal tolerance limits in relation to winter acclimatization of Drosophila melanogaster. We sampled flies from a natural habitat during winter in Denmark (field flies) and compared heat and cold tolerance of these to that of flies collected from the same natural population, but acclimated to 25 °C or 13 °C in the laboratory (laboratory flies). We further obtained thermal performance curves for egg-to-adult viability of field and laboratory (25 °C) flies, to estimate possible cross-generational effects of acclimation. We found much higher cold tolerance and a lowered heat tolerance in field flies compared to laboratory flies reared at 25 °C. Flies reared in the laboratory at 13 °C exhibited the same thermal cost-benefit relations as the winter acclimatized flies. We also found a cost of winter acclimatization in terms of decreased egg-to-adult viability at high temperatures of eggs laid by winter acclimatized flies. Based on our findings we suggest that winter acclimatization in nature can induce strong benefits in terms of increased cold tolerance. These benefits can be reproduced in the laboratory under ecologically relevant rearing and testing conditions, and should be incorporated in species distribution modelling. Winter acclimatization also leads to decreased heat tolerance. This may create a mismatch between acclimation responses and the thermal environment, e.g. if temperatures suddenly increase during spring, under current and expected more variable future climatic conditions.
Data from: Cognitive function and mood at high altitude following acclimatization and use of supplemental oxygen and adaptive servoventilation sleep treatments
Impairments in cognitive function, mood, and sleep quality occur following ascent to high altitude. Low oxygen (hypoxia) and poor sleep quality are both linked to impaired cognitive performance but their independent contributions at high altitude remain unknown. Adaptive servoventilation (ASV) improves sleep quality by stabilizing breathing and preventing central apneas without supplemental oxygen. We compared the efficacy of ASV and supplemental oxygen sleep treatments for improving daytime cognitive function and mood in high-altitude visitors (N = 18) during acclimatization to 3,800 m. Each night, subjects were randomly provided with ASV, supplemental oxygen (SpO₂ > 95%), or no treatment. Each morning subjects completed a series of cognitive function tests and questionnaires to assess mood and multiple aspects of cognitive performance. We found that both ASV and supplemental oxygen (O2) improved daytime feelings of confusion (ASV: p < 0.01; O₂: p < 0.05) and fatigue (ASV: p < 0.01; O₂: p < 0.01) but did not improve other measures of cognitive performance at high altitude. However, performance improved on the trail making tests (TMT) A and B (p < 0.001), the balloon analog risk test (p < 0.0001), and the psychomotor vigilance test (p < 0.01) over the course of three days at altitude after controlling for effects of sleep treatments. Compared to sea level, subjects reported higher levels of confusion (p < 0.01) and performed worse on the TMT A (p < 0.05) and the emotion recognition test (p < 0.05) on nights when they received no treatment at high altitude. These results suggest that stabilizing breathing (ASV) or increasing oxygenation (supplemental oxygen) during sleep can reduce feelings of fatigue and confusion but that daytime hypoxia may play a larger role in other cognitive impairments reported at high altitude. Furthermore, this study provides evidence that some aspects of cognition (executive control, risk inhibition, sustained attention) improve with acclimatization.
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Allen Brain Atlas
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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.