Search results for "Blastocyst"
showing 10 items of 137 documents
Embryo culture: can we perform better than nature?
2010
Culture of preimplantation-stage embryos has always been a key element of laboratory embryology and has contributed substantially to the success of many assisted reproduction procedures. During the past decade, its importance has increased as extended in-vitro embryo culture and single blastocyst transfer have become indispensable parts of the approach to decreasing the chance of multiple pregnancy while preserving the overall efficiency of the treatment. However, in spite of the scientific and commercial challenge stimulating research worldwide to optimize embryo culture conditions, a consensus is missing even in the basic principles, including composition and exchange of media, the requir…
Robust Automated Assessment of Human Blastocyst Quality using Deep Learning
2018
AbstractMorphology assessment has become the standard method for evaluation of embryo quality and selecting human blastocysts for transfer inin vitro fertilization(IVF). This process is highly subjective for some embryos and thus prone to human bias. As a result, morphological assessment results may vary extensively between embryologists and in some cases may fail to accurately predict embryo implantation and live birth potential. Here we postulated that an artificial intelligence (AI) approach trained on thousands of embryos can reliably predict embryo quality without human intervention.To test this hypothesis, we implemented an AI approach based on deep neural networks (DNNs). Our approac…
Osmotic and cryoprotective effects of a mixture of DMSO and ethylene glycol on rabbit morulae.
1993
Abstract Comparisons were made of the osmotic and cryoprotective effects on rabbit embryos preserved by vitrification with 2 solutions and by conventional freezing. Embryos obtained from rabbits killed 70 to 72 h after mating were used in the study (n = 948). Initially, toxicity of the 3 cryoprotectants was studied in fresh (unfrozen) embryos (n = 135). Subsequently, embryos placed in ethylene glycol (EG, 40% v/v; n = 88) and ethylene glycol with dimethyl sulfoxide (EG+DMSO, 20% v/v each, respectively; n = 344) were loaded into straws and plunged directly into liquid nitrogen. Embryos placed in 1.5 M DMSO and 20% heat inactivated rabbit serum were subjected to conventional freezing in a pro…
Beneficial Effect of Two Culture Systems with Small Groups of Embryos on the Development and Quality of In Vitro-Produced Bovine Embryos
2014
Summary Currently, in vitro-produced embryos derived by ovum pick up (OPU) and in vitro fertilization (IVF) technologies represent approximately one-third of the embryos worldwide in cattle. Nevertheless, the culture of small groups of embryos from an individual egg donor is an issue that OPU-IVF laboratories have to face. In this work, we tested whether the development and quality of the preimplantation embryos in vitro cultured in low numbers (five embryos) could be improved by the addition of epidermal growth factor, insulin, transferrin and selenium (EGF-ITS) or by the WOW system. With this aim, immature oocytes recovered from slaughtered heifers were in vitro matured and in vitro ferti…
Deep learning enables robust assessment and selection of human blastocysts after in vitro fertilization
2019
AbstractVisual morphology assessment is routinely used for evaluating of embryo quality and selecting human blastocysts for transfer after in vitro fertilization (IVF). However, the assessment produces different results between embryologists and as a result, the success rate of IVF remains low. To overcome uncertainties in embryo quality, multiple embryos are often implanted resulting in undesired multiple pregnancies and complications. Unlike in other imaging fields, human embryology and IVF have not yet leveraged artificial intelligence (AI) for unbiased, automated embryo assessment. We postulated that an AI approach trained on thousands of embryos can reliably predict embryo quality with…
A new strategy in selecting oocytes using cumulus cells analysis of specific molecules of the apoptotic pathway, according to the ability to reach bl…
2015
Study question: The aim of the research was to investigate the apoptosis rate of individual cumulus cell–oocyte complexes (COC), associated to the level of p-Akt, to verify the difference between oocytes who produce embryos able to reach the blastocyst stage compared with embryos arrested during the in vitro colture. Summary answer: It was demonstrated that DNA fragmentation in cumulus cells was remarkably lower in patients who achieved a pregnancy after ICSI cycles, related to the quality of oocytes and embryos. Akt pathway plays a critical role in the regulation of cell survival, and most growth factors activate this pathway. What is known already: Studies on oocyte maturation have shown …
Parasitación intestinal por unicelulares eucariotas en una población con obesidad mórbida: implicaciones clínico-metabólicas
2022
La obesidad es una enfermedad grave y multidimensional que, en la actualidad, ha alcanzado dimensiones pandémicas. Muchos son los mecanismos fisiopatológicos propuestos para intentar explicar el marcado aumento de su incidencia, y que se han orientado a hallar nuevas dianas terapéuticas con las que combatirla. Clásicamente se han señalado los factores ambientales propios del estilo de vida occidental (como la alimentación hipercalórica y el sedentarismo) como relevantes en el desarrollo de esta enfermedad; sin embargo, nuevas evidencias apuntan hacia que también podrían jugar un papel importante elementos infecciosos del medio, con repercusiones tanto perjudiciales como protectoras sobre el…
Enteroparasitosis asociadas a trastornos intestinales crónicos
2021
Las enteroparasitosis afectan a la estructura y ambiente intestinal generando sintomatología en pacientes susceptibles. Éstas podrían llegar a desencadenar, agravar o confundirse con Trastornos Gastrointestinales Crónicos (TGC), cada vez más frecuentes en la población. En el presente estudio, se analiza la prevalencia de parásitos intestinales en 295 pacientes con TGC y/o sintomatología mediante la combinación de métodos diagnósticos. Giardia intestinalis fue el parásito más prevalente (61,7%), seguido de Blastocystis sp. (13,2%), con una prevalencia de parasitación general del 67%. El análisis molecular halló los genotipos A (96%) y B (4%) de G. intestinalis, y cinco subtipos de Blastocyst…
Parasitosis intestinales en pacientes con malabsorción a lactosa y/o fructosa. Valoración del efecto de la terapia combinada
2019
La malabsorción de carbohidratos entre adultos es cada vez más frecuente. Estudios recientes sugieren una relación entre las parasitosis intestinales y el desarrollo de estos procesos patológicos. Las enteroparasitosis provocan cambios en la mucosa intestinal asociados con mala digestión y malabsorción de los alimentos. Este estudio ha analizado la frecuencia de parásitos intestinales en individuos adultos con trastornos gastrointestinales crónicos y diagnóstico de malabsorción a carbohidratos mediante el test de aliento. Para el diagnostico parasitológico se combinaron técnicas convencionales con moleculares. Los parásitos detectados fueron: Giardia intestinalis (24,4%), Blastocystis sp. (…
Description of an improved method for Blastocystis hominis culture and axenization
1996
An improved method for Blastocystis hominis culture and axenization was developed in the present study. Stool samples were cultured in prereduced Boeck-Drbohlav NHI modified medium (with several modifications) supplemented with antibiotics (0.4% ampicillin, 0.1% streptomycin, 0.0006% amphotericin B). Axenization was performed by the combination of partial purification of B. hominis by Ficoll-metrizoic acid gradient and inoculation in fresh medium containing active antibiotics against remaining bacteria. A total of 25 strains were obtained by this procedure. The time required for axenization ranged between 3 and 5 weeks. The generation time of axenic strains ranged from 6.6 to 12.1 h (mean +…