CryobiologyPub Date : 2024-06-28DOI: 10.1016/j.cryobiol.2024.104926
Huyun Chen , Bradley W. Ellis , Antonia T. Dinicu , Mohammadreza Mojoudi , Benjamin T. Wilks , Shannon N. Tessier , Mehmet Toner , Korkut Uygun , Basak E. Uygun
{"title":"Polyethylene glycol and caspase inhibitor emricasan alleviate cold injury in primary rat hepatocytes","authors":"Huyun Chen , Bradley W. Ellis , Antonia T. Dinicu , Mohammadreza Mojoudi , Benjamin T. Wilks , Shannon N. Tessier , Mehmet Toner , Korkut Uygun , Basak E. Uygun","doi":"10.1016/j.cryobiol.2024.104926","DOIUrl":"10.1016/j.cryobiol.2024.104926","url":null,"abstract":"<div><p>Current methods of storing explanted donor livers at 4 °C in University of Wisconsin (UW) solution result in loss of graft function and ultimately lead to less-than-ideal outcomes post transplantation. Our lab has previously shown that supplementing UW solution with 35-kilodalton polyethylene glycol (PEG) has membrane stabilizing effects for cold stored primary rat hepatocytes in suspension. Expanding on past studies, we here investigate if PEG has the same beneficial effects in an adherent primary rat hepatocyte cold storage model. In addition, we investigated the extent of cold-induced apoptosis through treating cold-stored hepatocytes with pan caspase inhibitor emricasan. In parallel to storage at the current cold storage standard of 4 °C, we investigated the effects of lowering the storage temperature to −4 °C, at which the storage solution remains ice-free due to the supercooling phenomenon. We show the addition of 5 % PEG to the storage medium significantly reduced the release of lactate dehydrogenase (LDH) in plated rat hepatocytes and a combinatorial treatment with emricasan maintains hepatocyte viability and morphology following recovery from cold storage. These results show that cold-stored hepatocytes undergo multiple mechanisms of cold-induced injury and that PEG and emricasan treatment in combination with supercooling may improve cell and organ preservation.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141330539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-25DOI: 10.1016/j.cryobiol.2024.104927
Torstein Schanche , Young Soo Han , Cole W. Jensen , Grace M. Arteaga , Torkjel Tveita , Gary C. Sieck
{"title":"β-adrenergic stimulation after rewarming does not mitigate hypothermia-induced contractile dysfunction in rat cardiomyocytes","authors":"Torstein Schanche , Young Soo Han , Cole W. Jensen , Grace M. Arteaga , Torkjel Tveita , Gary C. Sieck","doi":"10.1016/j.cryobiol.2024.104927","DOIUrl":"10.1016/j.cryobiol.2024.104927","url":null,"abstract":"<div><p>Victims of severe accidental hypothermia are frequently treated with catecholamines to counteract the hemodynamic instability associated with hypothermia-induced cardiac contractile dysfunction. However, we previously reported that the inotropic effects of epinephrine are diminished after hypothermia and rewarming (H/R) in an intact animal model. Thus, the goal of this study was to investigate the effects of Epi treatment on excitation-contraction coupling in isolated rat cardiomyocytes after H/R. In adult male rats, cardiomyocytes isolated from the left ventricle were electrically stimulated at 0.5 Hz and evoked cytosolic [Ca<sup>2+</sup>] and contractile responses (sarcomere length shortening) were measured. In initial experiments, the effects of varying concentrations of epinephrine on evoked cytosolic [Ca<sup>2+</sup>] and contractile responses at 37 °C were measured. In a second series of experiments, cardiomyocytes were cooled from 37 °C to 15 °C, maintained at 15 °C for 2 h, then rewarmed to 37 °C (H/R protocol). Immediately after rewarming, the effects of epinephrine treatment on evoked cytosolic [Ca<sup>2+</sup>] and contractile responses of cardiomyocytes were determined. At 37 °C, epinephrine treatment increased both cytosolic [Ca<sup>2+</sup>] and contractile responses of cardiomyocytes in a concentration-dependent manner peaking at 25–50 nM. The evoked contractile response of cardiomyocytes after H/R was reduced while the cytosolic [Ca<sup>2+</sup>] response was slightly elevated. The diminished contractile response of cardiomyocytes after H/R was not mitigated by epinephrine (25 nM) and epinephrine treatment reduced the exponential time decay constant (Tau), but did not increase the cytosolic [Ca<sup>2+</sup>] response. We conclude that epinephrine treatment does not mitigate H/R-induced contractile dysfunction in cardiomyocytes.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141300221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-20DOI: 10.1016/j.cryobiol.2024.104929
Jenyffer Rosero , Giselle Pessanha Pessoa , Gabriella Braga Carvalho , Lucia Suárez López , Silvio Carlos Alves dos Santos , Fabiana Fernandes Bressan , George Shigueki Yasui
{"title":"Primordial germ cells of Astyanax altiparanae, isolated and recovered intact after vitrification: A preliminary study for potential cryopreservation of Neotropical fish germplasm","authors":"Jenyffer Rosero , Giselle Pessanha Pessoa , Gabriella Braga Carvalho , Lucia Suárez López , Silvio Carlos Alves dos Santos , Fabiana Fernandes Bressan , George Shigueki Yasui","doi":"10.1016/j.cryobiol.2024.104929","DOIUrl":"10.1016/j.cryobiol.2024.104929","url":null,"abstract":"<div><p>Primordial germ cells (PGCs) constitute an important cell lineage that directly impacts genetic dissemination and species conservation through the creation of cryobanks. In order to advance the field of animal genetic cryopreservation, this work aimed to recover intact PGCs cryopreserved in embryonic tissues during the segmentation phase for subsequent <em>in vitro</em> maintenance, using the yellow-tailed tetra (<em>Astyanax altiparanae</em>) as a model organism. For this, a total of 202 embryos were distributed in two experiments. In the first experiment, embryos in the segmentation phase were dissociated, and isolated PGCs were maintained <em>in vitro.</em> They were visualized using <em>gfp-Pm-ddx4</em> 3′UTR labeling. The second experiment aimed to vitrify PGCs using 3 cryoprotective agents or CPAs (dimethyl sulfoxide, ethylene glycol, and 1,2 propanediol) at 3 molarities (2, 3, and 4 M). The toxicity, somatic cell viability, and recovery of intact PGCs were evaluated. After cryopreservation and thawing, 2 M ethylene glycol produced intact PGCs and somatic cells (44 ± 11.52 % and 42.35 ± 0.33 %, respectively) post-thaw. The recovery of PGCs from frozen embryonic tissues was not possible without the use of CPAs. Thus, the vitrification of PGCs from an important developmental model and Neotropical species such as <em>A. altiparanae</em> was achieved, and the process of isolating and maintaining PGCs in a culture medium was successful. Therefore, to ensure the maintenance of genetic diversity, PGCs obtained during embryonic development in the segmentation phase between 25 and 28 somites were stored through vitrification for future applications in the reconstitution of species through germinal chimerism.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141316912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-19DOI: 10.1016/j.cryobiol.2024.104912
Sahar Mahmoodian , Seyed Safa-ali Fatemi , Mehdi Shamsara , Mahsa Chaharmahali , Amir Meimandipour , Seyedeh Arezoo Maniee
{"title":"Impact of protectants and the method of preservation on the stability of potentially probiotic bacteria","authors":"Sahar Mahmoodian , Seyed Safa-ali Fatemi , Mehdi Shamsara , Mahsa Chaharmahali , Amir Meimandipour , Seyedeh Arezoo Maniee","doi":"10.1016/j.cryobiol.2024.104912","DOIUrl":"10.1016/j.cryobiol.2024.104912","url":null,"abstract":"<div><p>Probiotics offer health advantages when consumed in adequate quantities. As ongoing research identifies promising new strains, ensuring their viability and functionality through simple preservation methods is vital for success within the probiotic industry. This study employed a factorial design to investigate the combined effects of four cryoprotectants [C1: MRS broth + 14 % (w/v) glycerol, C2: Aqueous solution containing 4 % (w/v) trehalose, 6 % (w/v) skimmed milk, and 4 % (w/v) sodium glutamate, C3: Aqueous solution containing 10 % (w/v) skimmed milk and 4 % (w/v) sodium glutamate, C4: Aqueous solution containing 4 % (w/v) sucrose, 6 % (w/v) skimmed milk, and 4 % (w/v) sodium glutamate] and three methods of preservation (P1: −86 °C freezing, P2: −196 °C liquid nitrogen freezing, and P3: storing at 4 °C after lyophilization) on the cell viability of three potentially probiotic strains over 12 months. <em>Pediococcus</em> sp P15 and <em>Weissella cibaria</em> ml6 had the highest viability under treatments C3 and C2, after 12 months of storage, respectively. Meanwhile, <em>Lactococcus lactis</em> ml3 demonstrated the highest viability in both treatments C2 and C4 (<em>P ≤</em> 0.05). According to the results freezing, either P1 or P2, is the most effective preservation method for <em>P.</em> sp P15 and <em>W. cibaria</em> ml6. Meanwhile, <em>L. lactis</em> ml3 showed the highest colony count under treatment (P1) after 12 months of storage (<em>P ≤</em> 0.05). Among the tested conditions, <em>P.</em> sp P15 and <em>L. lactis</em> ml3 exhibited the highest viability and bile salt resistance when stored under P1C1. For <em>W. cibaria</em> ml6, the optimal storage condition was P2C2 (frozen in liquid nitrogen with cryoprotectant C2).</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141287865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-13DOI: 10.1016/j.cryobiol.2024.104915
Shuangxian Liu , Liang Lin , Biao Han , Junchao Ma , Hugh W. Pritchard , Xiaojian Hu , Min Deng , Hongying Chen
{"title":"Cryopreservation-enhanced differentiation capacity of embryogenic cultures of Castanea mollissima","authors":"Shuangxian Liu , Liang Lin , Biao Han , Junchao Ma , Hugh W. Pritchard , Xiaojian Hu , Min Deng , Hongying Chen","doi":"10.1016/j.cryobiol.2024.104915","DOIUrl":"10.1016/j.cryobiol.2024.104915","url":null,"abstract":"<div><p>A cryopreservation protocol has been developed for embryogenic cultures (ECs) of <em>Castanea mollissima</em>, an important economic species of the <em>Castanea</em> genus in China. We achieved 100 % regrowth when ECs were treated with Plant Vitrification Solution 2 (PVS2) for 30, 60 and 90 min on ice. Optimal PVS2 treatment for cryopreservation was determined to be 30 min on ice based on the highest biomass regrowth after thawing. Fluorescein diacetate (FDA) staining could rapidly and reliably determine post-thaw cell viability and its use facilitated the optimization of the cryopreservation protocols. Although the proliferation rate of the re-established ECs remained largely unchanged compared to non-cryopreserved ECs, the capacity of the re-established ECs to differentiate (on two media) into somatic embryos nearly doubled to approximately 2200–2300 globular somatic embryos per 1 g of re-established ECs. Based on cell cluster size analysis, this enhanced growth is primarily attributed to the presence of significantly greater cell clusters with a diameter of 100–200 μm, which have the highest level of differentiation ability. In order to understand the increased embryogenic potential following cryopreservation, we analyzed the expression of key genes related to somatic embryogenesis. Genes <em>CmWUS</em> and <em>CmABP1</em> were downregulated while <em>CmLEC1</em>, <em>CmAGL15</em>, <em>CmGRF2,</em> and <em>CmFUS3</em> were upregulated in re-established ECs when compared to non-cryopreserved ECs.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141237469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-12DOI: 10.1016/j.cryobiol.2024.104913
Lacey Johnson , Saffron J. Bryant , Pearl Lei , Christopher Roan , Denese C. Marks , Gary Bryant
{"title":"A deep eutectic solvent is an effective cryoprotective agent for platelets","authors":"Lacey Johnson , Saffron J. Bryant , Pearl Lei , Christopher Roan , Denese C. Marks , Gary Bryant","doi":"10.1016/j.cryobiol.2024.104913","DOIUrl":"10.1016/j.cryobiol.2024.104913","url":null,"abstract":"<div><p>The most widely used method of platelet cryopreservation requires the addition of dimethyl sulfoxide (DMSO; Me2SO) as a cryoprotective agent (CPA) and pre-freeze removal of Me2SO before freezing to mitigate toxicity. However, alternative CPAs such as deep eutectic solvents (DES), which are less toxic could simplify this process. The aim of this study was to determine the effectiveness of a Proline-Glycerol (Prol–Gly 1:3) DES as a platelet CPA. Platelets were cryopreserved at −80 °C using 10 % Prol–Gly 1:3 (DES; n = 6), or in the absence of a cryoprotectant (no CPA; n = 6). Platelets were also cryopreserved according to the gold-standard blood-banking method using 5.5 % Me2SO (n = 6), with centrifugation and pre-freeze removal of the excess Me2SO. Platelet quality was assessed by flow cytometry and thromboelastography (TEG). Post-thaw recovery was similar between the three groups. The abundance of labile platelet glycoproteins GPIbα and GPVI were highest in the DES group, however, markers of activation (CD62P and annexin-V) were also higher in this group. In terms of function, the strength of the clot (maximum amplitude; TEG) and extent of clot retraction was better with DES platelets compared to no CPA, but lower than Me2SO platelets. DES provides a cryoprotective advantage to platelets when compared to no CPA. Importantly, when compared to Me2SO platelets, most quality parameters were similar in DES platelets. The major advantage with using a DES is biocompatibility, therefore it does not need to be removed prior to transfusion. This greatly simplifies the freezing and thawing process, avoiding the toxic effects of Me2SO.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141179148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-06-12DOI: 10.1016/j.cryobiol.2024.104914
Ahmet Görgüç , Özlem Erdoğdu , Kardelen Demirci , Beyzanur Bayraktar , Fatih Mehmet Yilmaz
{"title":"Cryoprotective role of vacuum infused inulin on the quality of artichoke: Interactive effects of freezing, thawing and storage period","authors":"Ahmet Görgüç , Özlem Erdoğdu , Kardelen Demirci , Beyzanur Bayraktar , Fatih Mehmet Yilmaz","doi":"10.1016/j.cryobiol.2024.104914","DOIUrl":"10.1016/j.cryobiol.2024.104914","url":null,"abstract":"<div><p>Freezing of artichoke is a promising alternative to storing it in brine and canning. The perishable vegetable was vacuum infused with inulin to improve freezing tolerance. Artichokes with and without inulin were frozen by static, air blast and individual quick freezing (IQF) methods and thawed by microwave, 25 °C and 4 °C temperature levels at each month of 6-months storage. Process conditions were evaluated by multivariate analysis of variance (MANOVA) and were found significant on the quality parameters. Inulin infusion better conserved the a<sub>w</sub>, color, texture, ascorbic acid and overall integrity of artichokes during frozen storage. Inulin incorporation and IQF showed mutual positive effect on drip loss. Polyphenol oxidase (PPO) activity values fitted to 2nd order kinetic and the highest residuals were determined in static freezing. PPO showed alleviating effect on total phenolic content. Vacuum impregnation caused a color difference prior to freezing, but was found effective for maintaining color during storage. As a result, the use of quick freezing techniques together with the addition of cryoprotectant was effective in the preservation of artichoke quality attributes during frozen storage.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141184156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-05-29DOI: 10.1016/j.cryobiol.2024.104905
Soheil Kavian , Matthew J. Powell-Palm
{"title":"Limits of pressure-based ice detection during isochoric vitrification","authors":"Soheil Kavian , Matthew J. Powell-Palm","doi":"10.1016/j.cryobiol.2024.104905","DOIUrl":"10.1016/j.cryobiol.2024.104905","url":null,"abstract":"<div><p>Vitrification under isochoric (constant-volume or volumetrically confined) conditions has emerged as an intriguing new cryopreservation modality, but the physical complexities of the process confound straight-forward interpretation of experimental results. In particular, the signature pressure-based ice detection used in many isochoric techniques becomes paradoxical during vitrification, wherein the emergence of a sharp increase in pressure reliably indicates the presence of ice, but avoidance of this increase does not necessarily indicate its absence. This phenomenon arises from the rich interplay between thermochemical and thermovolumetric effects in isochoric systems, and muddies efforts to confirm the degree to which a sample has vitrified. In this work, we seek to aid interpretation of isochoric vitrification experiments by calculating thermodynamic limits on the maximum amount of ice that may form without being detected by pressure, and by clarifying the myriad physical processes at play. Neglecting kinetic effects, we develop a simplified thermodynamic model accounting for thermal contraction, cavity formation, ice growth, solute ripening, and glass formation, we evaluate it for a range of chamber materials and solution compositions, and we validate against the acutely limited data available. Our results provide both counter-intuitive insights— lower-concentration solutions may contract less while producing more pressure-undetectable ice growth for example— and a general phenomenological framework by which to evaluate the process of vitrification in isochoric systems. We anticipate that the model herein will enable design of future isochoric protocols with minimized risk of pressure-undetectable ice formation, and provide a thermodynamic foundation from which to build an increasingly rigorous multi-physics understanding of isochoric vitrification.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0011224024000609/pdfft?md5=4e77148890e2076a90344413ff75e983&pid=1-s2.0-S0011224024000609-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140956643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CryobiologyPub Date : 2024-05-27DOI: 10.1016/j.cryobiol.2024.104908
M. Victoria Santos , Sonia A. Crichigno , Víctor E. Cussac , Noemí Zaritzky
{"title":"Applying a heat transfer mathematical model for the cryopreservation of rainbow trout (Oncorhynchus mykiss) sperm: How straw location over liquid nitrogen level affects freezing rate and fertilization yield","authors":"M. Victoria Santos , Sonia A. Crichigno , Víctor E. Cussac , Noemí Zaritzky","doi":"10.1016/j.cryobiol.2024.104908","DOIUrl":"10.1016/j.cryobiol.2024.104908","url":null,"abstract":"<div><p>Cryopreservation of rainbow trout semen under field conditions was analyzed. Straw location over liquid nitrogen level is a crucial variable that affects freezing rate and fertilization yield due to changes in nitrogen vapor external temperature. The objectives were: to analyze cryopreservation protocols by experimentally measuring the cooling rates and fertilization yield of 0.5 ml plastic straws located in nitrogen vapor at different heights corresponding to different external temperatures; to numerically simulate the freezing process, by solving the heat transfer partial differential equations with the corresponding thermo-physical properties of the biological system and the plastic straw; to evaluate and analyze the surface heat transfer coefficient (h) during the freezing process of the straws; to introduce a new variable, the characteristic freezing time (tc), that enables comparison between protocols; this variable was defined as the elapsed period between the initial freezing temperature and a final reference temperature of −40 °C (temperature in which more than 80 % of the water is in a frozen state). The mathematical model predicted the temperature distribution inside the straw, showing a low effect of straw plastic materials (polyethylene-terephthalate glycol, polyvinyl-chloride, and polypropylene) on freezing rates. The average h value obtained from numerical simulations was 25.5 W/m<sup>2</sup> K, close to that obtained from the analytical Nusselt correlation for natural convection. An improvement on fertilization trials was observed when the average external nitrogen temperature was −129.6 °C (temperature range: −94 to −171 °C) with an average tc of 56.8 s (ranging between 47 and 72 s). These results corresponded to a height above the level of liquid nitrogen of 2 cm. Comparison with literature reported data showed satisfactory results. Applying mathematical models in the cryobiology field achieved results that are relevant for cryopreservation activities.</p></div>","PeriodicalId":10897,"journal":{"name":"Cryobiology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140956605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}