We discuss here all essential principles of cryoperservation in assisted reproductive techniques:
1. Oocye cryoperservation
2. Embryo cryopersevration
3. Sperm cryopersevration
Cryopreservation in Assisted Reproductionprasad lele
This document discusses cryopreservation techniques in assisted reproductive technology (ART). It begins with the origins of cryobiology dating back to ancient Egyptians. It describes the major stresses cells experience during freezing and the use of cryoprotectants to minimize freezing damage. Cryopreservation of various cell types is discussed including sperm, oocytes, embryos, and ovarian and testicular tissue. Slow freezing and vitrification protocols are covered. The document concludes with statistics on cryopreservation from the Southern Star ART Centre and a call for blessings on their work.
Human spermatozoa can tolerate a range of temperature. They are not very sensitive to damage caused by cooling possibly because of high membrane fluidity which is used as a technique to preserve spermatozoa in adverse conditions. cryopreservation technology has been a boon in every aspect of infertility & ART practice.
Cryopreservation is the process of preserving biological materials at ultra-low temperatures. Newer tools for cryopreservation aim to improve cell viability and reduce cryoinjury. These include techniques like trehalose delivery into cells, hydrogel encapsulation of cells, droplet-based cell printing, nano-warming using nanoparticles, supercooling without freezing, and isochoric preservation under constant volume. Future work should focus on advancing these techniques and discovering new innovations to enable longer periods of cryopreservation.
This document discusses sperm cryopreservation, including the aims, techniques, factors affecting results, and future issues. The key points are:
- Sperm cryopreservation preserves sperm cells at sub-zero temperatures for future use, such as for fertility treatments. Slow freezing and rapid freezing are two common techniques.
- Factors like cryoprotectants, cooling/thawing rates, and semen quality can impact sperm survival after thawing. Semen preparation before freezing may improve outcomes.
- While some studies found cryopreservation does not affect reproductive success rates with ICSI, its effects on sperm DNA integrity are still unclear and require more research. Proper cryopreservation protocols aim to minimize DNA damage
This document summarizes key concepts in vitrification and cryobiology. It discusses the components involved in vitrification including cryoprotectants like sucrose, ethylene glycol, DMSO, and propylene glycol. It outlines the steps in vitrification - adding cryoprotectants, cooling cells to -196C, warming/thawing, and removing cryoprotectants. Variables that can influence vitrification effectiveness are discussed. Composition of vitrification and warming solutions from different studies are presented. Similar survival rates between vitrification and slow freezing are noted. Open questions around water removal from oocytes during vitrification are raised. The need for long term follow up studies on neonatal outcomes is emphasized.
Embryo freezing involves preserving embryos at sub-zero temperatures, usually before implantation. There are two main methods - controlled rate freezing and vitrification. Controlled rate freezing involves slow cooling and seeding to prevent ice crystal formation, while vitrification solidifies the solution without any ice crystals using high concentrations of cryoprotectants. Both aim to minimize damage to embryos from freezing and thawing. Cryopreservation allows storage of surplus embryos and avoids multiple pregnancies from single retrievals. It also enables disease screening before transfer.
EMBRYO QUALITY ASSESSMENT, WHICH TO SELECT? Rahul Sen
This document discusses various methods for assessing embryo quality and selecting the best embryo for transfer, including traditional morphology assessment, kinetic/time-lapse imaging assessment, pre-implantation genetic testing, and 'omics' techniques. It emphasizes that traditional morphology alone provides limited information and that incorporating multiple parameters like developmental timing, fragmentation levels, and ploidy status can improve embryo selection and lead to higher implantation and pregnancy rates.
Cryopreservation in Assisted Reproductionprasad lele
This document discusses cryopreservation techniques in assisted reproductive technology (ART). It begins with the origins of cryobiology dating back to ancient Egyptians. It describes the major stresses cells experience during freezing and the use of cryoprotectants to minimize freezing damage. Cryopreservation of various cell types is discussed including sperm, oocytes, embryos, and ovarian and testicular tissue. Slow freezing and vitrification protocols are covered. The document concludes with statistics on cryopreservation from the Southern Star ART Centre and a call for blessings on their work.
Human spermatozoa can tolerate a range of temperature. They are not very sensitive to damage caused by cooling possibly because of high membrane fluidity which is used as a technique to preserve spermatozoa in adverse conditions. cryopreservation technology has been a boon in every aspect of infertility & ART practice.
Cryopreservation is the process of preserving biological materials at ultra-low temperatures. Newer tools for cryopreservation aim to improve cell viability and reduce cryoinjury. These include techniques like trehalose delivery into cells, hydrogel encapsulation of cells, droplet-based cell printing, nano-warming using nanoparticles, supercooling without freezing, and isochoric preservation under constant volume. Future work should focus on advancing these techniques and discovering new innovations to enable longer periods of cryopreservation.
This document discusses sperm cryopreservation, including the aims, techniques, factors affecting results, and future issues. The key points are:
- Sperm cryopreservation preserves sperm cells at sub-zero temperatures for future use, such as for fertility treatments. Slow freezing and rapid freezing are two common techniques.
- Factors like cryoprotectants, cooling/thawing rates, and semen quality can impact sperm survival after thawing. Semen preparation before freezing may improve outcomes.
- While some studies found cryopreservation does not affect reproductive success rates with ICSI, its effects on sperm DNA integrity are still unclear and require more research. Proper cryopreservation protocols aim to minimize DNA damage
This document summarizes key concepts in vitrification and cryobiology. It discusses the components involved in vitrification including cryoprotectants like sucrose, ethylene glycol, DMSO, and propylene glycol. It outlines the steps in vitrification - adding cryoprotectants, cooling cells to -196C, warming/thawing, and removing cryoprotectants. Variables that can influence vitrification effectiveness are discussed. Composition of vitrification and warming solutions from different studies are presented. Similar survival rates between vitrification and slow freezing are noted. Open questions around water removal from oocytes during vitrification are raised. The need for long term follow up studies on neonatal outcomes is emphasized.
Embryo freezing involves preserving embryos at sub-zero temperatures, usually before implantation. There are two main methods - controlled rate freezing and vitrification. Controlled rate freezing involves slow cooling and seeding to prevent ice crystal formation, while vitrification solidifies the solution without any ice crystals using high concentrations of cryoprotectants. Both aim to minimize damage to embryos from freezing and thawing. Cryopreservation allows storage of surplus embryos and avoids multiple pregnancies from single retrievals. It also enables disease screening before transfer.
EMBRYO QUALITY ASSESSMENT, WHICH TO SELECT? Rahul Sen
This document discusses various methods for assessing embryo quality and selecting the best embryo for transfer, including traditional morphology assessment, kinetic/time-lapse imaging assessment, pre-implantation genetic testing, and 'omics' techniques. It emphasizes that traditional morphology alone provides limited information and that incorporating multiple parameters like developmental timing, fragmentation levels, and ploidy status can improve embryo selection and lead to higher implantation and pregnancy rates.
PPT-Embryo grading and ART Summary.pptxKajal530634
Embryo grading is important in IVF to select good quality embryos for transfer based on developmental rate and morphology. The most followed grading systems are Gardner and Istanbul consensus, which assess embryos daily from fertilization to blastocyst stage based on criteria like cell number, size, and fragmentation. Good quality embryos with early cleavage and cell number on day 2 often develop into good blastocysts. Donor oocyte and sperm criteria and screening are also outlined to follow regulations. Oocyte donors can donate up to 7 oocytes only once in their lifetime from age 23-35.
Sperm cryopreservation is the process of freezing sperm to preserve fertility. It involves adding cryoprotective agents to minimize freezing damage before slowly cooling sperm to -196°C in liquid nitrogen storage. Factors like semen quality, freezing technique, and thawing process can impact sperm survival. While some studies found cryopreservation may damage DNA, properly performed it selectively affects defective sperm and clinical pregnancy rates are similar to fresh sperm. Optimization involves semen preparation, controlled freezing and thawing rates, and cryoprotectant use. Further research is still needed on impacts to DNA and reproductive outcomes.
In vitro maturation and In vitro FertilizationAsadullah Babar
Immature eggs are retrieved from the ovary through aspiration or slicing and matured in the laboratory. The eggs are then fertilized in vitro through incubation with sperm for 8-10 hours. Finally, the presumed zygotes are cultured for 9 days to allow embryonic development. This process involves collection, transportation, in vitro maturation of eggs, in vitro fertilization through sperm treatment and incubation, and in vitro culture of the resulting embryos.
This document discusses embryo transfer as the final step of assisted reproductive technology where embryos are placed in the female uterus. It describes factors that affect embryo transfer success including implantation capacity, endometrial receptivity, and technique. The document outlines techniques for embryo transfer including assisted hatching, embryo glue, catheter type and loading, ultrasound guidance, and ensuring no blood or mucus blockage. Successful embryo transfer requires a gentle, non-traumatic procedure performed with attention to numerous technical details.
The embryo transfer technique is the final and most crucial step of the IVF cycle. It requires close collaboration between the clinician and embryologist. While around 80% of embryos typically reach the transfer stage, the pregnancy rate remains low due to factors such as poor embryo quality and technique. The success of embryo transfer depends on proper preparation, including evaluating the cervico-uterine axis, clearing mucus from the cervix, and using ultrasound guidance. The embryo must be placed in the optimal location of the uterine cavity to maximize implantation chances. Attention to factors such as catheter type, duration of embryo loading, and prevention of uterine contractions can significantly improve clinical pregnancy outcomes.
The document discusses the key components of an optimal embryo culture system. It describes the various factors that make up embryo culture media, including ions, carbohydrates, amino acids, vitamins, and antioxidants. It explains that the media, gas phase, culture vessel, incubation chamber, and quality of ambient air all contribute to reducing stress on embryos in vitro. Developing the right culture system requires controlling various environmental factors to closely mimic the in vivo environment.
In vitro fertilization and embryo transfer "IVF"; Overview on the Story FRO...Ahmed Mowafy
The document discusses the history and development of in vitro fertilization (IVF). It mentions:
- Aldous Huxley predicted IVF techniques in his 1931 novel "Brave New World".
- The first reported pregnancies from IVF occurred in the late 1950s and early 1960s involving animals.
- The first reported human pregnancy from IVF was in 1973, though it resulted in miscarriage.
- The first successful human birth from IVF, Louise Brown, occurred in 1978 in the UK from the work of Steptoe and Edwards.
This document summarizes key aspects of human oogenesis and oocyte quality assessment. It describes the process of oogenesis, including formation of follicles in the ovaries and maturation of oocytes. It also discusses morphological features used to assess oocyte quality, such as the cumulus-oocyte complex, nuclear maturity, size and shape, the zona pellucida, polar body morphology, and perivitelline space. While some studies found correlations between certain morphological features and development outcomes, others found no significant correlations. Overall assessment of oocyte quality relies on evaluating multiple morphological characteristics.
ICSI as it is presently performed is far from an ideal solution because the selection of sperm is based on the judgement of an embryologist, who is looking for the most normal appearing sperm available.
Cryopreservation is a process that preserves biological material such as cells, tissues, organs, and embryos at very low temperatures. It allows for long-term storage. Key aspects covered in the document include:
- A brief history of cryopreservation including early pioneers and discoveries.
- Cryoprotectants like glycerol and DMSO are used to prevent ice crystal formation and reduce cell damage during freezing and thawing.
- Different cryopreservation techniques exist like slow freezing, rapid freezing, and stepwise freezing which control ice formation.
- Cryopreserved materials can be stored long-term in liquid nitrogen at -196°C or other cryogenic temperatures where biological activity is effectively stopped
Vitrification is a technique for cryopreserving cells, like blastocysts, that avoids ice crystal formation by solidifying the cells into an amorphous glass-like state through ultra-rapid cooling. Traditional vitrification used high concentrations of cryoprotectants at 4°C, while ultrarapid vitrification increases cooling rates to reduce cryoprotectant toxicity at room temperature. Vitrification offers advantages over slow freezing like shorter duration out of incubator and no ice crystal damage, but concerns include potential contamination from liquid nitrogen and effects on genetic structure. Studies show higher blastocyst survival and pregnancy rates with vitrification compared to slow freezing.
Media is used in IVF to keep cells wet, feed them, and control the environment. There are different types of media for gametes, fertilization, cleavage, and blastocyst stages. While studies have compared various media formulations, no clear treatment effect has been found on clinical outcomes like live birth or ongoing pregnancy rates. Optimal media aims to mimic the natural embryo environment with constant temperature, pH, and avoidance of contaminants.
Cryopreservation allows for the long-term storage of biological tissues like sperm and embryos at sub-zero temperatures, typically in liquid nitrogen. For sperm, the process involves collecting semen samples and freezing them using methods like slow freezing or rapid freezing. Frozen sperm can later be thawed and used in assisted reproduction. Embryo cryopreservation collects embryos after fertilization and selection of high-quality embryos, then freezes and stores the embryos for future use through controlled-rate freezing and thawing processes. Both techniques effectively stop biological activity at low temperatures and allow for indefinite storage of reproductive cells and tissues.
Third party reproduction ppt by Dr.GayathiriMorris Jawahar
This document discusses third party reproduction and oocyte donation. It provides information on the requirements and screening process for oocyte and sperm donors according to ICMR guidelines. Key points include that the donor's age is the primary factor impacting IVF success rates, with higher pregnancy rates seen in donor egg programs compared to routine IVF. Embryo donation success depends on embryo viability. The rights of children born through ART technologies and relevant legal issues are also outlined.
This document discusses effective protocols for superovulation when undergoing IVF treatment. It compares different ovarian stimulation protocols including long and short protocols using gonadotropin-releasing hormone (GnRH) agonists or antagonists. It also examines the use of human menopausal gonadotropin (hMG) versus recombinant follicle-stimulating hormone (r-FSH), as well as adding luteinizing hormone (LH) to stimulation. Key factors discussed include number of eggs retrieved, egg and embryo quality, risk of ovarian hyperstimulation syndrome, and pregnancy rates. The document provides guidance on optimizing protocols based on patient characteristics and treatment goals.
This document describes the sperm chromatin dispersion (SCD) test process and interpretation. The SCD test involves adding semen samples to agarose on a microscope slide, staining it, and examining under a microscope. Sperm with intact DNA will show halos of dispersed chromatin around the core, while fragmented sperm will not. The document outlines the steps of heating and cooling the agarose, adding and incubating the semen sample, washing and staining the slide, then examining under a microscope. Sperm are scored and the percentage of sperm with fragmented DNA (SDF%) is calculated, with lower percentages indicating better sperm DNA integrity.
Cryopreservation is the process of preserving living cells and tissues by cooling them to low sub-zero temperatures. This stops any chemical or enzymatic activity in the cells that could cause damage. Traditional cryopreservation relies on coating materials in cryoprotectants like glycerol or DMSO to prevent ice formation during freezing. Cryopreservation has applications for preserving reproductive cells, embryos, and tissues and is also used in the unproven field of cryonics which seeks to preserve entire human bodies for possible future revival.
1. Embryo development begins with fertilization and progresses through cleavage, blastulation, and implantation stages.
2. Key stages include the 2-cell, 4-cell, 8-cell, morula, early blastocyst, and blastocyst stages.
3. Implantation involves the blastocyst adhering and embedding within the uterine lining over a period of several days.
Sperm DNA Fragmentation in Male InfertilitySandro Esteves
This document summarizes a presentation on sperm DNA fragmentation (SDF) and male infertility. It discusses how SDF provides different information than routine semen analysis and is a better prognostic indicator. Elevated SDF is associated with infertility, poor assisted reproductive technology outcomes, and miscarriage. Several methods can assess SDF but differ in their ability to directly or indirectly measure damage. Lifestyle changes like reducing stress and smoking, treating underlying conditions, and using oral antioxidants can help lower SDF. Varicocele repair is also effective at reducing SDF levels in men with the condition.
Cryopreservation is the process of preserving living cells and tissues by cooling them to very low sub-zero temperatures. This stops all biological and chemical processes, halting the living material in a state of suspended animation. There are several key steps in cryopreservation including preculturing materials, adding cryoprotectants, slow or stepwise freezing, storage in liquid nitrogen at -196°C, rapid thawing, and then reculturing. Common cryopreservation methods include slow freezing, vitrification, encapsulation-dehydration, and cryopreservation has many applications for preserving genetic resources like semen, embryos, oocytes, and more.
Cryopreservation is a process where biological material is preserved by cooling to very low temperatures, typically with liquid nitrogen at -196°C. This stops any chemical or enzymatic activities that could damage the material. Common applications include preserving embryos, sperm, and some cells and tissues. For sperm cryopreservation, semen is mixed with cryoprotectants before slow or rapid freezing and stored in liquid nitrogen. For embryo cryopreservation, embryos are selected and frozen at various stages before storage. Cryopreservation has benefits like minimal storage space needs and protecting genetic material for long periods of time.
PPT-Embryo grading and ART Summary.pptxKajal530634
Embryo grading is important in IVF to select good quality embryos for transfer based on developmental rate and morphology. The most followed grading systems are Gardner and Istanbul consensus, which assess embryos daily from fertilization to blastocyst stage based on criteria like cell number, size, and fragmentation. Good quality embryos with early cleavage and cell number on day 2 often develop into good blastocysts. Donor oocyte and sperm criteria and screening are also outlined to follow regulations. Oocyte donors can donate up to 7 oocytes only once in their lifetime from age 23-35.
Sperm cryopreservation is the process of freezing sperm to preserve fertility. It involves adding cryoprotective agents to minimize freezing damage before slowly cooling sperm to -196°C in liquid nitrogen storage. Factors like semen quality, freezing technique, and thawing process can impact sperm survival. While some studies found cryopreservation may damage DNA, properly performed it selectively affects defective sperm and clinical pregnancy rates are similar to fresh sperm. Optimization involves semen preparation, controlled freezing and thawing rates, and cryoprotectant use. Further research is still needed on impacts to DNA and reproductive outcomes.
In vitro maturation and In vitro FertilizationAsadullah Babar
Immature eggs are retrieved from the ovary through aspiration or slicing and matured in the laboratory. The eggs are then fertilized in vitro through incubation with sperm for 8-10 hours. Finally, the presumed zygotes are cultured for 9 days to allow embryonic development. This process involves collection, transportation, in vitro maturation of eggs, in vitro fertilization through sperm treatment and incubation, and in vitro culture of the resulting embryos.
This document discusses embryo transfer as the final step of assisted reproductive technology where embryos are placed in the female uterus. It describes factors that affect embryo transfer success including implantation capacity, endometrial receptivity, and technique. The document outlines techniques for embryo transfer including assisted hatching, embryo glue, catheter type and loading, ultrasound guidance, and ensuring no blood or mucus blockage. Successful embryo transfer requires a gentle, non-traumatic procedure performed with attention to numerous technical details.
The embryo transfer technique is the final and most crucial step of the IVF cycle. It requires close collaboration between the clinician and embryologist. While around 80% of embryos typically reach the transfer stage, the pregnancy rate remains low due to factors such as poor embryo quality and technique. The success of embryo transfer depends on proper preparation, including evaluating the cervico-uterine axis, clearing mucus from the cervix, and using ultrasound guidance. The embryo must be placed in the optimal location of the uterine cavity to maximize implantation chances. Attention to factors such as catheter type, duration of embryo loading, and prevention of uterine contractions can significantly improve clinical pregnancy outcomes.
The document discusses the key components of an optimal embryo culture system. It describes the various factors that make up embryo culture media, including ions, carbohydrates, amino acids, vitamins, and antioxidants. It explains that the media, gas phase, culture vessel, incubation chamber, and quality of ambient air all contribute to reducing stress on embryos in vitro. Developing the right culture system requires controlling various environmental factors to closely mimic the in vivo environment.
In vitro fertilization and embryo transfer "IVF"; Overview on the Story FRO...Ahmed Mowafy
The document discusses the history and development of in vitro fertilization (IVF). It mentions:
- Aldous Huxley predicted IVF techniques in his 1931 novel "Brave New World".
- The first reported pregnancies from IVF occurred in the late 1950s and early 1960s involving animals.
- The first reported human pregnancy from IVF was in 1973, though it resulted in miscarriage.
- The first successful human birth from IVF, Louise Brown, occurred in 1978 in the UK from the work of Steptoe and Edwards.
This document summarizes key aspects of human oogenesis and oocyte quality assessment. It describes the process of oogenesis, including formation of follicles in the ovaries and maturation of oocytes. It also discusses morphological features used to assess oocyte quality, such as the cumulus-oocyte complex, nuclear maturity, size and shape, the zona pellucida, polar body morphology, and perivitelline space. While some studies found correlations between certain morphological features and development outcomes, others found no significant correlations. Overall assessment of oocyte quality relies on evaluating multiple morphological characteristics.
ICSI as it is presently performed is far from an ideal solution because the selection of sperm is based on the judgement of an embryologist, who is looking for the most normal appearing sperm available.
Cryopreservation is a process that preserves biological material such as cells, tissues, organs, and embryos at very low temperatures. It allows for long-term storage. Key aspects covered in the document include:
- A brief history of cryopreservation including early pioneers and discoveries.
- Cryoprotectants like glycerol and DMSO are used to prevent ice crystal formation and reduce cell damage during freezing and thawing.
- Different cryopreservation techniques exist like slow freezing, rapid freezing, and stepwise freezing which control ice formation.
- Cryopreserved materials can be stored long-term in liquid nitrogen at -196°C or other cryogenic temperatures where biological activity is effectively stopped
Vitrification is a technique for cryopreserving cells, like blastocysts, that avoids ice crystal formation by solidifying the cells into an amorphous glass-like state through ultra-rapid cooling. Traditional vitrification used high concentrations of cryoprotectants at 4°C, while ultrarapid vitrification increases cooling rates to reduce cryoprotectant toxicity at room temperature. Vitrification offers advantages over slow freezing like shorter duration out of incubator and no ice crystal damage, but concerns include potential contamination from liquid nitrogen and effects on genetic structure. Studies show higher blastocyst survival and pregnancy rates with vitrification compared to slow freezing.
Media is used in IVF to keep cells wet, feed them, and control the environment. There are different types of media for gametes, fertilization, cleavage, and blastocyst stages. While studies have compared various media formulations, no clear treatment effect has been found on clinical outcomes like live birth or ongoing pregnancy rates. Optimal media aims to mimic the natural embryo environment with constant temperature, pH, and avoidance of contaminants.
Cryopreservation allows for the long-term storage of biological tissues like sperm and embryos at sub-zero temperatures, typically in liquid nitrogen. For sperm, the process involves collecting semen samples and freezing them using methods like slow freezing or rapid freezing. Frozen sperm can later be thawed and used in assisted reproduction. Embryo cryopreservation collects embryos after fertilization and selection of high-quality embryos, then freezes and stores the embryos for future use through controlled-rate freezing and thawing processes. Both techniques effectively stop biological activity at low temperatures and allow for indefinite storage of reproductive cells and tissues.
Third party reproduction ppt by Dr.GayathiriMorris Jawahar
This document discusses third party reproduction and oocyte donation. It provides information on the requirements and screening process for oocyte and sperm donors according to ICMR guidelines. Key points include that the donor's age is the primary factor impacting IVF success rates, with higher pregnancy rates seen in donor egg programs compared to routine IVF. Embryo donation success depends on embryo viability. The rights of children born through ART technologies and relevant legal issues are also outlined.
This document discusses effective protocols for superovulation when undergoing IVF treatment. It compares different ovarian stimulation protocols including long and short protocols using gonadotropin-releasing hormone (GnRH) agonists or antagonists. It also examines the use of human menopausal gonadotropin (hMG) versus recombinant follicle-stimulating hormone (r-FSH), as well as adding luteinizing hormone (LH) to stimulation. Key factors discussed include number of eggs retrieved, egg and embryo quality, risk of ovarian hyperstimulation syndrome, and pregnancy rates. The document provides guidance on optimizing protocols based on patient characteristics and treatment goals.
This document describes the sperm chromatin dispersion (SCD) test process and interpretation. The SCD test involves adding semen samples to agarose on a microscope slide, staining it, and examining under a microscope. Sperm with intact DNA will show halos of dispersed chromatin around the core, while fragmented sperm will not. The document outlines the steps of heating and cooling the agarose, adding and incubating the semen sample, washing and staining the slide, then examining under a microscope. Sperm are scored and the percentage of sperm with fragmented DNA (SDF%) is calculated, with lower percentages indicating better sperm DNA integrity.
Cryopreservation is the process of preserving living cells and tissues by cooling them to low sub-zero temperatures. This stops any chemical or enzymatic activity in the cells that could cause damage. Traditional cryopreservation relies on coating materials in cryoprotectants like glycerol or DMSO to prevent ice formation during freezing. Cryopreservation has applications for preserving reproductive cells, embryos, and tissues and is also used in the unproven field of cryonics which seeks to preserve entire human bodies for possible future revival.
1. Embryo development begins with fertilization and progresses through cleavage, blastulation, and implantation stages.
2. Key stages include the 2-cell, 4-cell, 8-cell, morula, early blastocyst, and blastocyst stages.
3. Implantation involves the blastocyst adhering and embedding within the uterine lining over a period of several days.
Sperm DNA Fragmentation in Male InfertilitySandro Esteves
This document summarizes a presentation on sperm DNA fragmentation (SDF) and male infertility. It discusses how SDF provides different information than routine semen analysis and is a better prognostic indicator. Elevated SDF is associated with infertility, poor assisted reproductive technology outcomes, and miscarriage. Several methods can assess SDF but differ in their ability to directly or indirectly measure damage. Lifestyle changes like reducing stress and smoking, treating underlying conditions, and using oral antioxidants can help lower SDF. Varicocele repair is also effective at reducing SDF levels in men with the condition.
Cryopreservation is the process of preserving living cells and tissues by cooling them to very low sub-zero temperatures. This stops all biological and chemical processes, halting the living material in a state of suspended animation. There are several key steps in cryopreservation including preculturing materials, adding cryoprotectants, slow or stepwise freezing, storage in liquid nitrogen at -196°C, rapid thawing, and then reculturing. Common cryopreservation methods include slow freezing, vitrification, encapsulation-dehydration, and cryopreservation has many applications for preserving genetic resources like semen, embryos, oocytes, and more.
Cryopreservation is a process where biological material is preserved by cooling to very low temperatures, typically with liquid nitrogen at -196°C. This stops any chemical or enzymatic activities that could damage the material. Common applications include preserving embryos, sperm, and some cells and tissues. For sperm cryopreservation, semen is mixed with cryoprotectants before slow or rapid freezing and stored in liquid nitrogen. For embryo cryopreservation, embryos are selected and frozen at various stages before storage. Cryopreservation has benefits like minimal storage space needs and protecting genetic material for long periods of time.
This presentation discusses cryopreservation of gametes. Cryopreservation is a process that uses very low temperatures, typically with liquid nitrogen at -196°C, to preserve living cells and tissues. Cryoprotective agents are used to protect cells from freezing damage. Techniques discussed include slow freezing, rapid freezing and vitrification. Applications include sperm banking, embryo freezing and ovarian tissue cryopreservation. Both benefits and limitations of cryopreservation are mentioned such as the ability to preserve biological materials long-term but also the risk of cell damage from ice formation or toxic effects of cryoprotectants.
Cryopreservation allows for the long-term storage of biological tissues like sperm and embryos at sub-zero temperatures, typically in liquid nitrogen at -196°C. This stops all biological activities, allowing for indefinite storage. For sperm, the process involves collecting semen, analyzing sperm quality, mixing with cryoprotectants, and freezing using slow or rapid methods. Frozen sperm can be stored for decades. For embryos, fertilized eggs are selected, equilibrated in cryoprotectants, frozen using controlled-rate freezing, and stored in liquid nitrogen. Thawing reverses the freezing process. Both allow for fertility preservation and use of genetic material in assisted reproduction techniques long after collection.
Cryopreservation and its application to aquaculture.pptxNarsingh Kashyap
What is Cryopreservation ?
Cryopreservation is a process where biological materials such as cells and tissues are preserved by cooling to very low temperatures, usually at -196°C (the temperature of liquid nitrogen), yet remain viable after later warming to temperatures above 0°C.
Cryopreservation in aquatic species goes back 65 years and began about the same time as similar research was performed in livestock (Blaxter 2011).
In India, NBFGR & CIFA are the primary organization carrying out fish sperm cryopreservation for long term gene banking (J. K. Jena 2012)
Introduction
Reason for cryopreservation
Selection of part of plant for cryopreservation
Technique of cryopreservation
Application
Limitation
Conclusion
This document provides information on cryopreservation of germplasm, sperm, and oocytes. It defines cryopreservation as the preservation of biological tissues at sub-zero temperatures, typically -196°C, to effectively stop all biological activities. Cryopreservation benefits include conserving germplasm of endangered species, fertility preservation, and creating stocks that remain viable indefinitely. The process involves using liquid nitrogen, cryoprotectants, and cryofreezers. It then describes the specific processes for cryopreserving sperm and oocytes, including the steps of collection, analysis, freezing, thawing, and potential risks and results.
Cryopreservation is the process of preserving biological materials such as cells, tissues, organs, embryos, and sperm at very low temperatures. It allows for long-term storage of biological samples by suspending their metabolic activities. Samples are typically stored in liquid nitrogen at -196°C. Cryopreservation aims to cool samples without the formation of ice crystals that can damage cells. Cryoprotectants are used to protect cells from freezing damage. Common cryopreservation methods include storage at -196°C, above -196°C, freeze drying, and vitrification. Cryopreservation finds applications in fertility treatments and preservation of genetic materials.
This document summarizes cryopreservation techniques for sperm banking and artificial insemination. It discusses how cryopreservation involves freezing biological material like sperm at ultra-low temperatures to preserve it using cryoprotectants like glycerol. Sperm banking involves collecting and storing frozen semen for future artificial insemination procedures to aid fertility. Artificial insemination is then described as the process of using a catheter to inject preserved sperm into the female's reproductive tract to facilitate conception.
This document provides an overview of cryopreservation, which involves preserving living cells and tissues at ultra-low temperatures, typically in liquid nitrogen. It discusses the principles, processes, and steps involved, including addition of cryoprotectants, freezing and storage at temperatures below -130°C, thawing, re-culturing cells, measuring viability, and regenerating plants from cryopreserved cells or tissues. The goal is to halt biological and chemical processes to preserve living material intact for long periods of time while maintaining viability after thawing.
Cryopreservation is the process of preserving living cells and tissues by cooling them to very low sub-zero temperatures (typically -196°C using liquid nitrogen). The key steps involve pre-treatment of plant materials with cryoprotectants and dehydration, slow or rapid freezing, storage in liquid nitrogen, thawing, and regeneration of plants. Cryopreservation allows for long-term storage of plant genetic resources and endangered species. While it has enabled conservation of many plant species, some recalcitrant plants remain difficult to cryopreserve. Recent developments include vitrification and encapsulation-dehydration techniques.
The bank of embryo and the process of embryo Cryopreservation.S Rasouli
This document summarizes the process of embryo cryopreservation. It discusses who may benefit from embryo freezing, including young cancer patients and those wishing to delay fertility. The process involves stimulating egg production, fertilizing eggs with sperm to create embryos, freezing the embryos using cryoprotectants, and storing them in liquid nitrogen. Success rates for thawed embryo transfers are around 30%. While some risks like ovarian hyperstimulation exist, studies find no increased birth defect risks compared to fresh embryo transfers. Overall the document provides an overview of the technical process and considerations for embryo freezing and thawing.
Advances and Applications of Cryopreservation Techniques in FisheriesDeepa Bhatt
This document summarizes advances and applications of cryopreservation techniques in fisheries. It discusses the principles and mechanisms of cryopreservation including the use of cryoprotectants and liquid nitrogen storage. Studies on cryopreserving sperm from various fish species like Indian major carps, brown trout, and koi carp are described. Cryopreservation of fish sperm has applications for conservation of genetic resources, selective breeding programs, and sustainable aquaculture.
This document discusses blastocyst vitrification and transfer. It begins by defining a blastocyst and explaining how blastocyst transfer mimics the natural implantation process more closely than other embryo transfer methods. It then discusses several benefits of blastocyst culture and vitrification, including improved embryo selection, endometrial synchronization, and increased success rates. The document also addresses patient selection criteria for blastocyst transfer and vitrification considerations like survival rates, re-expansion timing, and factors that can impact outcomes such as blastocyst quality, stage, and cryopreservation techniques. In conclusion, it suggests that with refinement of techniques and media, vitrification may replace slow freezing as the preferred blastocyst cryopreservation method.
Germplasm refers to the genetic material of an organism. This document outlines methods for conserving plant germplasm, specifically cryopreservation which involves freezing plant tissues in liquid nitrogen. The key steps in cryopreservation include selecting suitable plant material, pre-freezing treatments using techniques like preculture or desiccation, freezing the material, storing it in liquid nitrogen, thawing it, and assessing viability. Cryopreservation allows for long-term storage of plant genetic resources and clonal propagation of plant varieties.
- Cryopreservation involves preserving biological material such as sperm, cells or tissues at sub-zero temperatures, usually using liquid nitrogen.
- There are several techniques used in cryopreservation including slow freezing, vitrification and step-wise freezing to prevent ice crystal formation and cell damage.
- Cryopreservation has many applications including sperm banks, fertility preservation, conservation of plant and animal species, and controversial techniques like cryonics where human bodies are preserved at very low temperatures.
1) Cryopreservation of therapeutic cells is important for maintaining their functionality but poses challenges due to variability in cell types and biological characteristics. Standardizing cryopreservation processes can improve consistency and patient outcomes.
2) Optimizing cryopreservation involves controlling factors like freezing and thawing rates and using cryoprotectants to minimize cell damage from ice formation and dehydration. Emerging technologies aim to standardize and improve these processes for translating cellular therapies from development to manufacturing and clinical use.
3) Proper temperature control and monitoring during freezing, storage, transport and thawing of cells is critical but challenging given natural variations in cells and current limitations in cold chain management technologies. New solutions are needed to strictly maintain optimal temperatures
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All about Cryopreservation Applications, Cryovials, Avoiding Contamination.pdfAccumax Labs
In simple terms, it is the process of storing biological material at ultra-low temperatures (usually at -196 degree celsius) in order to preserve it for a long period and stop any biological activity it may have during that time.
Cryopreservation is the process of preserving living cells and tissues at very low temperatures, typically in liquid nitrogen at -196°C. It works by slowing metabolism to a halt, preventing biological deterioration. Successful cryopreservation requires preventing ice crystal formation inside cells through cryoprotectants and controlling the freezing and thawing process. Organogenesis is the formation of plant organs directly from explants or indirectly through a callus phase, guided by growth regulators like auxins and cytokinins. It involves dedifferentiation of explant cells into a callus through rapid cell division, followed by redifferentiation forming organ primordia.
1. Spermatogenesis (Spermatocytogenesis, Spermiogenesis, Spermiation, Shape and function of cells inside the Testis, Semen and sperm structure, Sperm journey after synthesis to outside)
This document discusses various sperm preparation techniques used prior to assisted reproductive technologies. It begins by explaining the reasons for processing sperm samples, such as removing components that could prevent pregnancy and selecting morphologically normal, motile sperm free of debris. Several migration-based techniques are described, including swim-up, density gradient centrifugation, and magnetic activated cell sorting. Glass wool filtration and zeta potential techniques are also covered. The document discusses preparation of epididymal and testicular sperm samples. It concludes by outlining methods for preparing sperm from retrograde ejaculation samples.
Sperm DNA Fragmentation (Oxidative stress, DNA damage and apoptosis, Test, Techniques, Relation to other semen parameters, Relationship to leucocytes, Relation to ICSI outcomes, Clinical applications, significance and limitations)
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Here, we discuss what is the components of IVF laboratory.
In-vitro fertilization (IVF) is a process by which oocytes are fertilized by sperm outside the women’s womb, in vitro. It still represents one of the most exciting modern scientific developments and continues to have a tremendous impact on
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1. Infertility is defined as the inability to conceive after one year of unprotected intercourse. Around 10-15% of the population experiences infertility.
2. There are several requirements for natural conception, including the production of healthy eggs and sperm, unblocked fallopian tubes, fertilization, and implantation. When these requirements are not met, Assisted Reproductive Technologies (ART) may help.
3. ART includes procedures like in vitro fertilization (IVF), intracytoplasmic sperm injection (ICSI), frozen embryo transfer, and pre-implantation genetic screening. The goal is to help sperm fertilize eggs or implant embryos when natural conception is not possible. Selecting an experienced ART
The document provides information about andrology laboratory services for male infertility evaluation and treatment. It discusses:
- Tests offered including semen analysis, specialized tests of sperm function and morphology, sperm processing for infertility treatments, and cryopreservation.
- Procedures for semen sample collection, transport, and analysis following WHO standards, including macroscopic examination of volume, pH, and microscopic examination of motility, concentration, vitality, and morphology.
- Uses of semen analysis to diagnose infertility issues, identify treatment options, and assess effectiveness of treatments like vasectomy reversal. Computer-assisted semen analysis is also discussed.
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This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
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2. What is Cryopreservation?
• Enable to interfere biological clock and to stop it for a while until it is
thawed.
• Cryopreservation is the freezing of cells or tissues to sub zero temperatures,
typically -196 º C (boiling point of liquid nitrogen).
• Basically, cryopreservation is a procedure to preserve the gamete,
embryonic cells or tissues by arresting or slowing metabolic activity until
the subsequent thawing procedures.
• Cryopreservation era arised with the accidentally understanding of the value
of cryoprotectants in 1949 by Christopher Polge.
3. Intracellular ice formation(IIF):
Cooling to storage temperature is accomplished by formation of ice in the intracellular as
well as extracellular compartments. Extensive IIF is incompatible with the preservation of
cell viability, causing widespread physical/structural damage.
Prevention of IIF is achieved by:
• Use of cryoprotective agents(CPAs), chemicals that
interfere with the water and interact with
biomolecules.(Osmotic gradient based on kinetic
bases)
• Permeating or Intracellular CAPs: are oligohydroxy
compounds of relative low toxicity which can enter
cell across the plasmamembrane.
• Impermeating or extracellular CAPs: are
polyhydroxy compounds and are unable to diffuse
intracellular compartment
• The cell is cooled down to subzero slowly (normally to a
rate of -2 ͦC/min) to avoid thermal shock. (Control ice
nucleation)
A] Water replacement: B] Slow cooling:
Essential principles of controlled rate cooling
4. Two basic techniques currently rule the field of
cryopreservation
Slow freezing
• Lower cryoprotectant (less
toxic) concentration.
• Longer exposure time.
• Longer to perform.
• Fast cooling rates results in
solidification of solution into
glass-like structure(no
crystalization).
• Technically easier.
• Closed system.
• Freezing machine.
• Greater chance of ice formation.
• Not cost effective.
Vitrification
• Higher cryoprotectant
concentration.
• Shorter exposure time.
• Shorter to perform.
• Slow dehydration to minimize
ice-crystal formation.
• More clinical expertise.
• Open or closed system.
• No machine needed.
• Less chance of ice formation.
• Cost effective.
5.
6. How to maximize the outcome of vitrification?
1. Technical parameters
1. Type and concentration of cryoprotectants, even all cryoprotectants are toxic.
2. Temperature of vitrification solution at exposure.
3. Lenght of time embryos are exposed to the final cryoprotectant before plunging into liquid
nitrogen.
4. Variability in the volume of cryoprotectant solution surrounding the embryos
5. Technical proficiency of the embryologists
6. Cooling speed of vitrification sample size and type of carrier.
2. Embryonic parameters
1. The quality and embryonic stage.
2. Inherent fecundity.
Vitrification is associated with a significantly lower cellular trauma and higher post-warming
survival, pregnancy, and implantation rates than with other cryopreservation techniques.
7. Why is Oocyte Cryopreservation?
I. Women at risk of losing ovarian function
II. Women desiring fertility preservation (e.g. delayed maternity).
III. Eliminating ethical concerns of embryo cryopreservation.
IV. Solving the dilemma of abandoned frozen embryos in the IVF laboratory.
8. First pregnancy after oocyte
cryopreservation was reported by Chen in
1986.
Less than 200 pregnancies have been
achieved worldwide.
Survival rate of 80% and fertilization rates
of 83%, however low pregnancy rates.
Although pregnancy rates might be
improving, rates appear to be significantly
less than those seen with standard IVF.
Procedure abandoned for approx. 10 years
due to poor results
Low fertilisation rate
Low survival rates
Hardening of zona
Possible spindle damage
Oocyte Freezing:
Where do we
stand?
9. Why is Embryo Cryopreservation?
I. Large number of good-quality embryos or blastocyst available for transfer.
II. Female uterus is not ready to receive embryos.
III. Reduction in the incident of multiple pregnancies.
IV. Decrease in the need of repeated cycles of ovarian stimulation.
V. Embryo donation.
VI. Thaw cycle is cost-effective, approximately 1/5 of normal ICSI cycle.
VII. Detect infectious disease and genetic abnormalities
VIII. Ovarian hyper-stimulation syndrome.
10. By the 1980s, the freezing of human
embryos emerged as a common procedure in
the treatment of infertile couples.
First pregnancy after embryo
cryopreservation was reported by Trounson
and Mohr in 1983.
Two year later, Cohen published new
procedure for human blastocyst stage
embryo freezing.
Nowadays, 31% of embryo transfers utilize
embryo cryopreserved/warmed transfer
cycles.
8 % of all ART babies are born from
cryopreserved embryos.
Embryo Freezing:
Where do we
stand?
11. When embryos are cryopreserved?
• PN stage : (18-22 hours after ICSI)
• Cleaved stage: Day 2, 3 or 4 after ICSI.
• Blastocyst stage: Day 5, 6 or 7 after ICSI.
12.
13. Why is Sperm Cryopreservation?
I. Semen containing a very limited number of spermatozoa or abnormal
semen parameters.
II. For cancer patients to preserve their fertility prior to gonadotoxic
chemotherapy or radiation.
III. Patients undergoing certain types of pelvic or testicular surgeries
IV. Patients who suffer from degenerative illnesses such as diabetes or multiple
sclerosis; spinal cord disease or injury.
V. Persons in occupations where a significant risk of gonadotoxicity prevails.
VI. Surgical sterilization such as vasectomy.
VII.Donor semen samples .
VIII.Used in combination with ART techniques.
14. 1950, the methods for cryopreserving
human semen and artificial insemination
were refined, resulting in the first human
birth.
Today, conservative estimates prove that
more than 300,000 births have been
achieved through artificial insemination with
cryopreserved semen.
cryopreserved human semen maintained for
over 30 years, no limit has been established
for how long human semen can be frozen .
Sperm cryopreservation and banking has
become a widely accepted procedures.
Sperm Freezing:
Where do we
stand?
15. • Embryo, sperm, oocyte are generally use and achieve by frozen-thawed
programs in Human ART program.
Vitrification has superior outcomes over slow freezing.
Conclusions…………