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269 results for “THaWS”
Association between seven-day serum β-hCG levels after frozen–thawed embryo transfer and pregnancy outcomes: a single-centre retrospective study from China
<p><span><b><span>Objective:</span></b> Early monitoring of plasma human chorionic gonadotropin (β-hCG) level is vital in predicting pregnancy outcome. This study investigated the predictive value of serum β-hCG level on the 7th day after frozen-thawed embryo transfer (FET) for ongoing pregnancy (OP) and adverse pregnancy (AP). </span></p> <p><span><b><span>Design: </span></b>Retrospective study</span></p> <p><span><b><span>Setting:</span></b> The Reproductive and Genetic Center of the Affiliated Hospital of Shandong University of Traditional Chinese Medicine, China.</span></p> <p><span><b><span>Participants: </span></b>1,061 pregnant women who underwent FET between January 2014 and January 2017. </span></p> <p><span><b><span>Primary and secondary outcome measures: </span></b>Pregnancy outcome.</span></p> <p><span><b><span>Results: </span></b>Serum β-hCG levels on the 7th day after FET were higher in the single OP group compared to the biochemical pregnancy (BP) group (p <0.001). Besides, the serum β-hCG cutoff level at 4.34 mIU/mL on the 7th day showed high predictive value (area under the curve [AUC] = 0.852). Serum β-hCG levels on the 7th day after FET were higher in the twin OP group compared to the single OP group (p<0.001). Also, the serum β-hCG cutoff level at 17.95 mIU/mL on the 7th day showed high predictive value (AUC = 0.903). Serum β-hCG levels on the 7th day after FET were lower in the ectopic pregnancy (EP) group compared to the single OP group (p <0.001) whereas, serum β-hCG cutoff level at 4.53 mIU/mL on the 7th day exhibited a high predictive value (AUC = 0.860). Further, the serum β-hCG levels on the 7th day after FET were lower in the single early spontaneous abortion (SA) group compared to the single OP group (p<0.001) while the serum β-hCG cutoff level at 5.34 mIU/mL on the 7th day exhibited high predictive value (AUC = 0.738).</span></p> <p><span><b><span>Conclusion:</span></b> Serum β-hCG on the 7th day after FET has good clinical significance for the prediction of OP and AP.</span></p>
Thermal adaptations to extreme freeze-thaw cycles in the high tropical Andes
<p>Temperature plays a key role in the biology of ectotherms, including anurans, which are found at higher elevations in the tropics than anywhere in the temperate zone. High-elevation tropical environments are characterized by extreme daily thermal fluctuation including high daily maxima and nightly freezing. Our study investigated the contrasting operative temperatures of the anurans <i>Telmatobius marmoratus </i>and<i> Pleurodema marmoratum</i> in different environmental contexts at the same elevation and biome above 5200 meters. <i>Telmatobius marmoratus</i> avoids extremes of daily temperature fluctuation by utilizing thermally buffered aquatic habitat at all life stages, with minimal operative temperature variation (range: 4.6–8.0°C).<i> Pleurodema marmoratum</i>, in contrast, experienced operative temperatures from -3.5 to 44°C and has one of the widest thermal breadths reported for any tropical frog, from >32°C (critical thermal maximum) to surviving freezing periods of 1 hr and 6 hr down to -3.0°C. Our findings expand experimental evidence of frost tolerance in amphibians to the widespread Neotropical family Leptodactylidae, the first such evidence of frost tolerance in a tropical amphibian. Our study identifies three strategies (wide thermal tolerance breadth, use of buffered microhabitats, and behavioral thermoregulation), which allow these tropical frogs to withstand the current wide daily thermal fluctuation above 5000 masl and which may help them adapt to future climatic changes.</p>
Permafrost thaw in boreal peatlands is rapidly altering forest community composition
<p>Boreal peatlands are frequently underlain by permafrost, which is thawing rapidly. A common ecological response to thaw is the conversion of raised forested plateaus to treeless wetlands, but unexplained spatial variation in responses, combined with a lack of stand-level data, make it difficult to predict future trajectories of boreal forest composition and structure. We sought to characterize patterns and identify drivers of forest structure, composition, mortality, and recruitment in a boreal peatland experiencing permafrost thaw. To do this, we established a large (10 ha) permanent forest plot (completed in 2014), located in the Northwest Territories, Canada, that includes 40,584 mapped and measured trees. In 2018, we conducted a comprehensive mortality and recruitment recensus. We also measured frost table depth, soil moisture, soil humification, and organic layer thickness within the plot between 2012 and 2018, and used habitat association tests to link these variables to forest characteristics and dynamics. Forest composition and structure varied markedly throughout the plot and were strongly governed by patterns in permafrost presence and organic layer thickness. Overall, there was a net loss of trees from the plot at a rate of 0.7% yr-1. Mortality of black spruce, the dominant tree species, was more than double that of recruitment and was strongly associated with permafrost thaw. In contrast, recruitment of larch was over four times greater than mortality, and occurred primarily in low-lying, permafrost-free wetlands with mineral soil near the surface. The trends in tree demography and underlying drivers suggest that spruce-dominated permafrost plateaus will be converted into larch-dominated wetlands as permafrost thaw progresses in boreal peatlands, particularly in areas where mineral soil is near the surface. In the longer term, thaw could increase the hydrologic connectivity of the landscape, resulting in widespread drainage and re-vegetation by spruce, but we did not find evidence that this is occurring yet. Given the increasing rates of permafrost thaw, and positive feedbacks between thaw and forest change, we predict that larch abundance will continue to increase in boreal peatlands over the coming decades, leading to shifts in ecosystem function, wildlife habitat, albedo, and snow dynamics.</p>
Metabolic cost of freeze-thaw and source of CO2 production in the freeze-tolerant cricket Gryllus veletis
<p>Freeze-tolerant insects can survive the conversion of a substantial portion of their body water to ice. While the process of freezing induces active responses from some organisms, these responses appear absent from freeze-tolerant insects. Recovery from freezing likely requires energy expenditure to repair tissues and re-establish homeostasis, which should be evident as elevations in metabolic rate after thaw. We measured carbon dioxide (CO<sub>2</sub>) production in the spring field cricket (<i>Gryllus veletis</i>) as a proxy for metabolic rate during cooling, freezing and thawing and compared the metabolic costs associated with recovery from freezing and chilling. We hypothesized that freezing does not induce active responses, but that recovery from freeze-thaw is metabolically costly. We observed a burst of CO<sub>2</sub>release at the onset of freezing in all crickets that froze, including those killed by either cyanide or an insecticide (thiacloprid), implying that the source of this CO<sub>2</sub>was neither aerobic metabolism or a coordinated nervous system response. These results suggest that freezing does not induce active responses from <i>G. veletis</i>, but may liberate buffered CO<sub>2 </sub>from hemolymph. There was a transient 'overshoot' in CO<sub>2</sub>release during the first hour of recovery, and elevated metabolic rates at 24, 48 and 72 hours, in crickets that had been frozen compared to crickets that had been chilled (but not frozen). Thus, recovery from freeze-thaw and the repair of freeze-induced damage appears metabolically costly in <i>G. veletis</i>, and this cost persists for several days after thawing. </p>
Suppression of Methanogenesis by Microbial Reduction of Iron-Organic Carbon Associations in Fully Thawed Permafrost Soil
<p>This data set contains data associated with the manuscript "Suppression of Methanogenesis by Microbial Reduction of Iron-Organic Carbon Associations in Fully Thawed Permafrost Soil". Currently under review.</p>
Reduction of iron-organic carbon associations shifts net greenhouse gas release after initial permafrost thaw
<p>This dataset contains data associated with the manuscript "Reduction of iron-organic carbon associations shifts net greenhouse gas release after initial permafrost thaw". doi: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.soilbio.2025.109735" target="_blank" rel="noreferrer noopener"><span><span>https://doi.org/10.1016/j.soilbio.2025.109735</span></span></a></p>
Data supporting "Freeze-thaw migration behavior of scree deposits in the cold regions"
<p>All data used in the study to support this research is available on repository via 10.5281/zenodo.12542438</p>
Quantitatively Monitoring of Seasonal Frozen Ground Freeze-thaw Cycle Using Ambient Seismic Noise Data
<p>This is the electronic supplemental data for the publication entitled </p> <p>"<strong>Quantitatively Monitoring of Seasonal Frozen Ground Freeze-thaw Cycle Using Ambient Seismic Noise Data</strong>"</p> <p>submitted to <strong>Seismological Research Letters (SRL)</strong>. </p> <p>The names of the compressed files represent the experiment number and station number. For example, "1_2" indicates data collected from the second station during the first experiment. Each compressed file contains seismic raw data in the ".SAC" format. The filenames include the UTC end time of data collection. For instance, "453003616.00000001.2021.10.20.06.40.22.000.z.sac" indicates that data collection ended at 06:40:22 on October 20, 2021. Each complete .sac file contains 4 days of data with a sampling interval of 0.002 seconds.</p>
Temperature profile measurements in the debris-covered headwalls of four thaw slumps in the Tuktoyaktuk Coastlands, Northwest Territories, Canada
<p>Temperature profile measurements in the debris-covered headwalls of four thaw slumps in the Tuktoyaktuk Coastlands, Northwest Territories, Canada, summer 2018</p> <p>Instruments<br> We used iButton probes (DS1922L; maxim integrated) that were coated with resin.<br> We submerged the probes in an ice bath from 2018-5-31 22:00 - 2018-06-01 11:00.</p> <p>Deployment<br> The iButtons were anchored in hollow, sealed rods. The rods were inserted so that iButtons were located at 5, 20 and 35 cm depth.<br> The rods contained the following iButtons at (05, 20, 35) cm depth [None indicating that there was no probe in the respective slot]:<br> Rod, (probe at 5 cm, probe at 20 cm, probe at 35 cm),<br> 1, (01,02,03)<br> 2, (None,04,None)<br> 3, (None,05,None)<br> 4, (06,07,08)<br> 5, (09,10,11)<br> 6, (None,12,None)<br> 7, (None,13,None)<br> 8, (None,14,None)<br> 9, (16,15,None)<br> 10, (17,18,19)</p> <p>Locations<br> Top Lake:<br> Location: 68.757N, 133.520W<br> Rods: 4 (central), 7 (23 cm above central rod in dip direction), 1 (25 cm from central rod in strike direction [west]), 6 (23 cm below central rod in dip direction), 20 (10 m from headwall; slump floor)<br> Deployment: 2018-06-15 - 2018-08-05</p> <p> Evan Lake:<br> Location: 68.754N, 133.464W<br> Rods: 9 (central)<br> Deployment: 2018-06-13 - 2018-08-24</p> <p> Roadside:<br> Location: 69.007N, 133.361W<br> Rods: 10 (central), 2 (20 cm above central rod in dip direction), 8 (20 cm from central rod in strike direction [west]), 3 (20 cm below central rod in dip direction)<br> Deployment: 2018-06-27 - 2018-08-21</p> <p> Timbit Lake:<br> Location: 69.105N, 133.290W<br> Rods: 5 (central)<br> Deployment: 2018-06-15 - lost<br> <br> Data description:<br> Each XX.txt file contains the native output of the iButton software by maxim integrated for probe XX. A calibration offset can be estimated from the average temperature recorded during the ice-bath calibration period.</p>
Time-lapse videos of three debris-covered thaw slumps; NWT, Canada; summer 2018
<p>Time-lapse videos of three debris-covered thaw slumps</p> <p>Location:</p> <p>Top Lake: 68.757N, 133.520W<br> Evan Lake: 68.754N, 133.464W<br> Timbit Lake: 69.105N, 133.290W</p> <p>Duration:</p> <p>June 2018 - August 2018</p> <p> </p>
The source code for a new capillary and adsorption‒force model predicting hydraulic conductivity of soil during freeze‒thaw processes
<p>The source code is related to "A New Capillary and Adsorption‒Force Model Predicting Hydraulic Conductivity of Soil during Freeze‒thaw Processes" (Shufeng Qiao, Rui Ma, Yunquan Wang, Ziyong Sun, Helen Kristine French, Yanxin Wang)</p>
The retrogressive thaw slump (RTS) inventory in permafrost region of the QTP
<p>This dataset contain the retrogressive thaw slump (RTS) inventory in permafrost region of the Qinghai–Tibet Plateau (QTP) based on field investigations and the manual interpretation of the Gaofen-1 and Gaofen-2 images. RTSs were visually detected based on the presence of recently exposed sediments, poorly developed vegetation, and distinct headwalls. To avoid misdelineation of the RTS, the entire permafrost region of the QTP was divided into a large number of grids measuring 5 × 5 km each. Grids with slope degrees below 1° or higher than 15° were excluded because RTSs are rarely found at these slopes according to our previous study and field investigations. RTSs in the remaining grids were detected and sketched by the first author and then examined by at least two other experienced authors. Once a RTS was identified, it was assigned a unique number and classified based on its initiation such as next to a river (R), by lake erosion (L), and after the occurrence of active-layer detachment slide.</p>
Data of publication Carbon Dioxide Release from Retrogressive Thaw Slumps in Siberia
<p>This is the publication of data for the publication Beer et al., Carbon Dioxide Release from Retrogressive Thaw Slumps in Siberia, submitted to the Journal Environmental Research Letters in 2023.</p> <p>There are three variables included in the file results_thawslump_extrapolation_23092022.xlsx file: area of all thaw slumps, 0-100 cm carbon stocks of all thaw slumps, and annual CO2 release from all thaw slumps. In the mat-file there is even more information on soil temperature and CO2 production and emissions for a complete uncertainty assessment.</p>
Natural Versus Artificial Cycle for Frozen-Thawed Embryo Transfer
ClinicalTrials.gov study NCT03642665. IPD Sharing: NO. Countries: 1. Publications: 0.
Modified Luteal Support for Frozen-Thawed Embryo Transfer - A Prospective Study
ClinicalTrials.gov study NCT02825290. IPD Sharing: NO. Countries: 1. Publications: 12.
Clinical Effectiveness of Frozen Thawed Embryo Transfer Compared to Fresh Embryo Transfer
ClinicalTrials.gov study NCT02570386. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Live Birth After Fresh Embryo Transfer Vs Frozen-thawed Embryo Transfer in Women With Polycystic Ovary Syndrome
ClinicalTrials.gov study NCT01841528. IPD Sharing: Not stated. Countries: 1. Publications: 7.
What is the Optimal Cycle Regimen for Frozen- Thawed Embryo Transfer Cycles
ClinicalTrials.gov study NCT03954587. IPD Sharing: NO. Countries: 1. Publications: 19.
Hyaluronan-enriched Embryo Transfer Medium for Frozen-thawed Embryo Transfer
ClinicalTrials.gov study NCT02725827. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Cryopreservation Medium With Apigenin on Post-thaw Human Sperm
ClinicalTrials.gov study NCT06560216. IPD Sharing: NO. Countries: 1. Publications: 45.
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