I. Freezing Lactic Acid Bacteria
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Cold Shock Response in Mammalian Cells
J. Mol. Microbiol. Biotechnol. (1999) 1(2): 243-255. Cold Shock ResponseJMMB in Mammalian Symposium Cells 243 Cold Shock Response in Mammalian Cells Jun Fujita* Less is known about the cold shock responses. In microorganisms, cold stress induces the synthesis of Department of Clinical Molecular Biology, several cold-shock proteins (Jones and Inouye, 1994). A Faculty of Medicine, Kyoto University, Kyoto, Japan variety of plant genes are known to be induced by cold stress, and are thought to be involved in the stress tolerance of the plant (Shinozaki and Yamaguchi-Shinozaki, 1996; Abstract Hughes et al., 1999). The response to cold stress in mammals, however, has attracted little attention except in Compared to bacteria and plants, the cold shock a few areas such as adaptive thermogenesis, cold response has attracted little attention in mammals tolerance, and storage of cells and organs. Recently, except in some areas such as adaptive thermogenesis, hypothermia is gaining popularity in emergency clinics as cold tolerance, storage of cells and organs, and a novel therapeutic modality for brain damages. In addition, recently, treatment of brain damage and protein low temperature cultivation has been dicussed as a method production. At the cellular level, some responses of to improve heterologous protein production in mammalian mammalian cells are similar to microorganisms; cold cells (Giard et al., 1982). stress changes the lipid composition of cellular Adaptive thermogenesis refers to a component of membranes, and suppresses the rate of protein energy expenditure, which is separable from physical synthesis and cell proliferation. Although previous activity. It can be elevated in response to changing studies have mostly dealt with temperatures below environmental conditions, most notably cold exposure and 20°C, mild hypothermia (32°C) can change the cell’s overfeeding. -
ADDENDUM SHEET America's Boating Course
ADDENDUM SHEET SM America’s Boating Course - 2001 Edition Homeland Security Measures Boaters must be aware of rules and guidelines regarding homeland security measures. The following are steps that boaters should take to protect our country and are a direct result of the terrorist attacks of 11 September 2001. Keep your distance from all military vessels, cruise lines, or commercial shipping: • All vessels must proceed at a no-wake speed when within a Protection Zone (which extends 500 yards around U.S. naval vessels). • Non-military vessels are not allowed to enter within 100 yards of a U.S. naval vessel, whether underway or moored, unless authorized by an official patrol. The patrol may be either Coast Guard or Navy. • Violating the Naval Vessel Protection Zone is a felony offense, punishable by up to six years imprisonment and / or up to $250,000 in fines. Observe and avoid all security zones. Avoid commercial port operation areas. Avoid restricted areas near: • Dams • Naval ship yards • Power plants • Dry docks Do not stop or anchor beneath bridges or in channels. Keep your boat locked when not using it, including while at temporary docks, such as yacht clubs, restaurants, marinas, shopping, etc. When storing your boat disable the engine. If on a trailer, immobilize it so it cannot be moved. Keep a sharp eye out for anything that looks peculiar or out of the ordinary, and report it to the Coast Guard, port or marine security. When boating within a foreign country make certain that you check-in with the foreign country’s Customs Service upon entering the country and with the USA Customs Service and/or Immigration and Naturalization Service upon returning. -
Autonomic Conflict: a Different Way to Die During Cold Water Immersion
J Physiol 590.14 (2012) pp 3219–3230 3219 TOPICAL REVIEW ‘Autonomic conflict’: a different way to die during cold water immersion? Michael J. Shattock1 and Michael J. Tipton2 1Cardiovascular Division, King’s College London, London, UK 2Extreme Environments Laboratory, Department of Sports and Exercise Science, University of Portsmouth, Portsmouth, UK Abstract Cold water submersion can induce a high incidence of cardiac arrhythmias in healthy volunteers. Submersion and the release of breath holding can activate two powerful and antagonistic responses: the ‘cold shock response’ and the ‘diving response’.The former involves the activation of a sympathetically driven tachycardia while the latter promotes a parasympathetically mediated bradycardia. We propose that the strong and simultaneous activation of the two limbs of the autonomic nervous system (‘autonomic conflict’) may account for these arrhythmias and may, in some vulnerable individuals, be responsible for deaths that have previously wrongly been ascribed to drowning or hypothermia. In this review, we consider the evidence supporting this claim and also hypothesise that other environmental triggers may induce autonomic conflict and this may be more widely responsible for sudden death in individuals with other predisposing conditions. (Received 6 February 2012; accepted after revision 27 April 2012; first published online 30 April 2012) Corresponding author M. Shattock: Cardiovascular Division, King’s College London, The Rayne Institute, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK. Email: [email protected] Introduction: do all drowning victims drown? on average, we lose about one child a week. Historically, death in cold water was generally ascribed to hypothermia; In most countries of the world, immersion represents the more recently, description of the initial ‘cold shock’ second most common cause of accidental death in children response (Tipton, 1989b) to immersion and other factors and the third in adults (Bierens et al. -
Selection of Cryoprotectant in Lyophilization of Progesterone-Loaded Stearic Acid Solid Lipid Nanoparticles
pharmaceutics Article Selection of Cryoprotectant in Lyophilization of Progesterone-Loaded Stearic Acid Solid Lipid Nanoparticles Timothy M. Amis, Jwala Renukuntla, Pradeep Kumar Bolla and Bradley A. Clark * Department of Basic Pharmaceutical Sciences, Fred Wilson School of Pharmacy, High Point University, High Point, NC 27268, USA; [email protected] (T.M.A.); [email protected] (J.R.); [email protected] (P.K.B.) * Correspondence: [email protected]; Tel.: +1-336-841-9665 Received: 18 August 2020; Accepted: 16 September 2020; Published: 19 September 2020 Abstract: Cryoprotectants are often required in lyophilization to reduce or eliminate agglomeration of solute or suspended materials. The aim of this study was to select a cryoprotecting agent and optimize its concentration in a solid lipid nanoparticle formulation. Progesterone-loaded stearic acid solid lipid nanoparticles (SA-P SLNs) were prepared by hot homogenization with high speed mixing and sonication. The stearic acid content was 4.6% w/w and progesterone was 0.46% w/w of the initial formulation. Multiple surfactants were evaluated, and a lecithin and sodium taurocholate system was chosen. Three concentrations of surfactant were then evaluated, and a concentration of 2% w/w was chosen based on particle size, polydispersity, and zeta potential. Agglomeration of SA-P SLNs after lyophilization was observed as measured by increased particle size. Dextran, glycine, mannitol, polyvinylpyrrolidone (PVP), sorbitol, and trehalose were evaluated as cryoprotectants by both an initial freeze–thaw analysis and after lyophilization. Once selected as the cryoprotectant, trehalose was evaluated at 5%, 10%, 15%, and 20% for optimal concentration, with 20% trehalose being finally selected as the level of choice. -
Cryoprotectant Production Capacity of the Freeze-Tolerant Wood Frog, Rana Sylvatica
71 Cryoprotectant production capacity of the freeze-tolerant wood frog, Rana sylvatica JoN P. Cosr,cNzo AND Rlcnano E. LsE, Jn. Department of Zoology, Miami University, Oxford, OH 45056, U.S.A. ReceivedJune 8. 1992 AcceptedAugust 17, 1992 CosmNzo, J. P., and LBp, R. E., Jn. 1993. Cryoprotectantproduction capacityof the freeze-tolerantwood frog, Rana sylvatica.Can. J. Zool. 7I: 7l-75. Freezingsurvival of the wood frog (Rana sylvatica)is enhancedby the synthesisof the cryoprotectantglucose, via liver glycogenolysis.Because the quantityof glucosemobilized during freezingbears significantly on the limit of freezetolerance, we investigated the relationship between the quantity of liver glycogen and the capacity for cryoprotectant synthesis. We successfullyaugmented natural levels of liver glycogenby injecting cold-conditionedwood frogs with glucose.Groups of 8 frogs having mean liver glycogenconcentrations of 554 + 57 (SE), 940 + 57, and 1264 + 66 pmollg catabolized98.7, 83.4, and 52.8%, respectively,of their glycogenreserves during 24 h of freezingto -2.5'C. Glucoseconcentrations con- comitantly increased,reaching 2l + 3, 102 + 23, and 119 + 14 pmollg, respectively,in the liver, and 15 * 3,42 + 5, and 6l * 5 pcmol/ml-, respectively, in the blood. Becausethe capacity for cryoprotectant synthesisdepends on the amount of liver glycogen,the greatestrisk of freezinginjury likely occursduring spring,when glycogenreserves are minimal. Non- glucoseosmolites were important in the wood frog's cryoprotectantsystem, especially in frogs having low glycogenlevels. Presumably the natural variation in cryoprotectant synthesis capacity among individuals and populations of R. sylvatica chiefly reflectsdifferences in glycogenreserves; however, environmental,physiological, and geneticfactors likely are also involved. CosmNzo, J. P., et LEs, R. E., Jn. -
Sperm Cryopreservation: a Review on Current Molecular Cryobiology and Advanced Approaches
1 RBMO VOLUME 00 ISSUE 0 2018 REVIEW Sperm cryopreservation: A review on current molecular cryobiology and advanced approaches BIOGRAPHY Abdolhossein Shahverdi is Professor of Embryology and scientific director of the Sperm Biology Group at the Royan Institute in Tehran. His main research interests are fertility preservation, reproductive epigenetic and germ cell biology. With over 20 years’ experience in reproductive biology, he has published more than 120 international scientific papers. Maryam Hezavehei1,2, Mohsen Sharafi3,*, Homa Mohseni Kouchesfahani2, Ralf Henkel4, Ashok Agarwal5, Vahid Esmaeili1, Abdolhossein Shahverdi1,* KEY MESSAGE Understanding the new aspects of sperm cryobiology, such as epigenetic and proteomic modulation, as well as novel techniques, is essential for clinical applications and the improvement of ART protocols. Long-term follow-up studies on the resultant offspring obtained from cryopreserved spermatozoa is recommended for future studies. ABSTRACT The cryopreservation of spermatozoa was introduced in the 1960s as a route to fertility preservation. Despite the extensive progress that has been made in this field, the biological and biochemical mechanisms involved in cryopreservation have not been thoroughly elucidated to date. Various factors during the freezing process, including sudden temperature changes, ice formation and osmotic stress, have been proposed as reasons for poor sperm quality post-thaw. Little is known regarding the new aspects of sperm cryobiology, such as epigenetic and proteomic modulation of sperm and trans-generational effects of sperm freezing. This article reviews recent reports on molecular and cellular modifications of spermatozoa during cryopreservation in order to collate the existing understanding in this field. The aim is to discuss current freezing techniques and novel strategies that have been developed for sperm protection against cryo-damage, as well as evaluating the probable effects of sperm freezing on offspring health. -
Adaptation of the Cold Shock Response and Cooling Rates On
International Journal of Aquatic Research and Education Volume 9 | Number 2 Article 6 5-1-2015 Adaptation of the Cold Shock Response and Cooling Rates on Swimming Following Repeated Cold Water Immersions in a Group of Children Aged 10 – 12 years Flora Bird Queen's Hospital, [email protected] Jim House University of Portsmouth Michael J. Tipton University of Portsmouth Follow this and additional works at: http://scholarworks.bgsu.edu/ijare Recommended Citation Bird, Flora; House, Jim; and Tipton, Michael J. (2015) "Adaptation of the Cold Shock Response and Cooling Rates on Swimming Following Repeated Cold Water Immersions in a Group of Children Aged 10 – 12 years," International Journal of Aquatic Research and Education: Vol. 9: No. 2, Article 6. Available at: http://scholarworks.bgsu.edu/ijare/vol9/iss2/6 This Research Article is brought to you for free and open access by ScholarWorks@BGSU. It has been accepted for inclusion in International Journal of Aquatic Research and Education by an authorized administrator of ScholarWorks@BGSU. Bird et al.: Adaptation of the Cold Shock Response and Cooling Rates on Swimmi International Journal of Aquatic Research and Education, 2015, 9, 149 -161 http://dx.doi.org/10.1123/ijare.2014-0081 © 2015 Human Kinetics, Inc. ORIGINAL RESEARCH Adaptation of the Cold Shock Response and Cooling Rates on Swimming Following Repeated Cold Water Immersions in a Group of Children Aged 10–12 Years Flora Bird Queen’s Hospital James R. House and Michael J. Tipton University of Portsmouth Habituation of the cold shock response and adaptation in deep body cooling with prolonged cold water immersion is well documented in adults. -
Effects of Sample Treatments on Genome Recovery Via Single-Cell Genomics
The ISME Journal (2014) 8, 2546–2549 & 2014 International Society for Microbial Ecology All rights reserved 1751-7362/14 www.nature.com/ismej SHORT COMMUNICATION Effects of sample treatments on genome recovery via single-cell genomics Scott Clingenpeel1, Patrick Schwientek1, Philip Hugenholtz2 and Tanja Woyke1 1DOE Joint Genome Institute, Walnut Creek, CA, USA and 2Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia Single-cell genomics is a powerful tool for accessing genetic information from uncultivated microorganisms. Methods of handling samples before single-cell genomic amplification may affect the quality of the genomes obtained. Using three bacterial strains we show that, compared to cryopreservation, lower-quality single-cell genomes are recovered when the sample is preserved in ethanol or if the sample undergoes fluorescence in situ hybridization, while sample preservation in paraformaldehyde renders it completely unsuitable for sequencing. The ISME Journal (2014) 8, 2546–2549; doi:10.1038/ismej.2014.92; published online 13 June 2014 Relatively little is known about the functioning of genomes from single cells. Three methods of sample complex microbial communities, largely due to the preservation were tested: cryopreservation with difficulty in culturing most microbes (Rappe and 20% glycerol as a cryoprotectant, preservation in Giovannoni, 2003). Although metagenomics can 70% ethanol, and preservation in 4% paraformalde- provide information on the genetic capabilities of hyde. Because paraformaldehyde treatment causes the entire community, it is difficult to connect crosslinks between nucleic acids and proteins, we predicted gene functions to specific organisms using tested cells exposed to 4% paraformaldehyde with metagenomics (Morales and Holben, 2011). -
Physical and Chemical Changes in Stabilized Mince from Pacific Whiting During Frozen Storage
AN ABSTRACT OF THE THESIS OF Edda Magnusdottir for the degree of Master of Science in Food Science & Technology presented on April 28, 1995. Title: Physical and Chemical Changes in Stabilized Mince from Pacific Whiting During Frozen Storage. Abstract approved: - L Michael T. Morrissey Cryoprotection in stabilized mince from Pacific whiting (Merluccius productus) was investigated by monitoring changes in physical and chemical properties during 32 weeks of frozen storage. The effects of 4 different cryoprotectants were evaluated by torsion test, color analysis, extractability of salt soluble proteins, and formation of dimethylamine (DMA) and 2-thiobarbituric acid (TBA). The quality of the stabilized mince was significantly higher than the control (mince without cryoprotectants) when compared by shear strain, salt soluble proteins, and DMA. The results show that the functionality of the proteins in the mince can be protected by using cryoprotectants with Polydextrose® being the most effective of the 4 tested. The effect of food-grade protease inhibitors on the gel-forming characteristics of Pacific whiting mince was also investigated. Four levels (1, 2, 3, and 4%) of different protease inhibitors (beef plasma protein, whey protein concentrate, egg white liquid, and egg white powder) were added to the stabilized mince before heating and effects on texture and color were evaluated. Shear strain was significantly increased by increasing the level of inhibitors. Beef plasma protein was most effective and presented significantly higher strain than the other inhibitors tested. Due to higher concentration of proteolytic enzymes in the mince, an increased amount of protease inhibitors is needed compared to surimi to prevent proteolysis during heating. -
Cryopreservation Page 3
2nd quarter 2010 • Volume 31:2 funding Your Cryopreservation page 3 Death of Robert Prehoda Page 7 Member Profile: Mark Plus page 8 Non-existence ISSN 1054-4305 is Hard to Do page 14 $9.95 Improve Your Odds of a Good Cryopreservation You have your cryonics funding and contracts in place but have you considered other steps you can take to prevent problems down the road? Keep Alcor up-to-date about personal and medical changes. Update your Alcor paperwork to reflect your current wishes. Execute a cryonics-friendly Living Will and Durable Power of Attorney for Health Care. Wear your bracelet and talk to your friends and family about your desire to be cryopreserved. Ask your relatives to sign Affidavits stating that they will not interfere with your cryopreservation. Attend local cryonics meetings or start a local group yourself. Contribute to Alcor’s operations and research. Contact Alcor (1-877-462-5267) and let us know how we can assist you. Alcor Life Extension Foundation is on Connect with Alcor members and supporters on our official Facebook page: http://www.facebook.com/alcor.life.extension.foundation Become a fan and encourage interested friends, family members, and colleagues to support us too. 2ND QUARTER 2010 • VOLUME 31:2 2nd quarter 2010 • Volume 31:2 Contents COVER STORY: PAGE 3 funding Your Cryopreservation Without bequests and page 3 donations Alcor’s revenue falls 11 Book Review: The short of covering its operating Rational Optimist: How expenses. This means that Prosperity Evolves Alcor should further cut costs Former Alcor President or increase revenue. -
Kinetic Vitrification of Spermatozoa of Vertebrates: What Can We Learn from Nature?
1 Kinetic Vitrification of Spermatozoa of Vertebrates: What Can We Learn from Nature? I.I. Katkov** et al.* CELLTRONIX and Sanford-Burnham Institute for Medical Research, San Diego, California, USA Dedicated to the memory of Father Basile J. Luyet (1897-1974) 1. Introduction This as well as two other related Chapters, by Isachenko et al. and Moskovtsev et al., open this Book neither accidentally nor by the Editor’s preferences to his friends and collaborators; the reasons, in fact, lie quite deeper: Why sperm? Cryobiology had actually started from freezing sperm. We will skip all those very early anecdotes but should mention the Spallanzani attempt to freeze frog semen in the 18th century [Spallanzani, 1780]. Cryobiology as a science started with revolutionizing work of Father Luyet and other scientists of the late 1930’s and 1940’s, who we can collectively call “the pioneers of the cryobiological frontiers” (see the following sub-Chapter). There were several reasons why sperm was chosen, which included easiness in obtaining the samples, clear evidence of viability (moving – not moving, though later it was figured that everything was not so easy in this sophisticated living “cruise missile”), and importance for the farming industry with the emergence of systematic selective breeding (especially in cattle) with a powerful tool – artificial insemination (AI). AI started with the revolutionary work of W. Heape, I.I. Ivanov and other scientists at the dawn of the 20th century and was further developed by V.K. Milovanov in the 1930’s as a viable breeding technology (see [Foote, * V.F. Bolyukh2, O.A. -
A Review and Application of Cryoprotectant: the Science of Cryonics
PharmaTutor PRINT ISSN: 2394-6679 | E-ISSN: 2347-7881 12 A Review and Application of Cryoprotectant: The Science of Cryonics Ankit J. Joshi Department of Pharmaceutics & Pharmaceutical Technology, S. K. Patel College of Pharmaceutical Education and Research, Ganpat University, Kherva, Gujarat. [email protected] ABSTRACT The preservation of cells, tissues and organs by cryopreservation is promising technology now days and Low temperature technology has progressed in the field of tissue engineering, food preservation, fertility preservation, making disease resistant breeds since the early years to occupy a central role in this technology. Cryopreservation is important technology in every field like in organ cryopreservation, food cryopreservation, human cryopreservation, seeds cryopreservation, protein cryopreservation and pharmaceuticals. Cryobiologists will be required to collaborate with new physical and molecular sciences to meet this challenge. How cryoprotectants work is a mystery to most people. In fact, how they work was even a mystery to science until just a few decades ago. This article will explain in basic terms how cryoprotectants protect cells from damage caused by ice crystals, and with some of the advances. Key Words: Cryopreservation, Cryoprotectants, vitrification, Penetrating & non-penetrating cryoprotectant. INTRODUCTION A cryoprotectant is a substance used to protect Types of cryopreservation [1-4] biological tissue from freezing damage (i.e. that due (1) Isochoric cryopreservation to ice formation). Cryopreservation is a process Isochoric (constant volume) cryopreservation is where cells or tissues are preserved by cooling to low referred for biological material at low temperature. sub-zero temperatures, such as 77 K or -196°C (the In isochoric cryopreservation, the solution boiling point of liquid nitrogen).