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Related Concept Videos

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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Mechanism of heat transfer01:19

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer II01:20

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
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Related Experiment Video

Updated: Feb 8, 2026

Fertilization of Xenopus oocytes using the Host Transfer Method
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Published on: November 2, 2010

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Pronuclear Transfer in Human Oocytes.

Louise Hyslop1,2

  • 1Newcastle Fertility Centre, Biomedicine West Wing, Centre for Life, Newcastle Upon Tyne NE1 4EP, UK. Louise.Hyslop@nuth.nhs.uk.

Methods in Molecular Biology (Clifton, N.J.)
|July 2, 2018
PubMed
Summary

This study details early pronuclear transfer (PNT) in human eggs, a method for genetic material manipulation. Experienced practitioners achieve high success rates, offering potential advancements in reproductive technologies.

Keywords:
Fertilized eggKaryoplastMitochondrial DNA (mtDNA)Pronuclear transfer (PNT)Pronuclei

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Related Experiment Videos

Last Updated: Feb 8, 2026

Fertilization of Xenopus oocytes using the Host Transfer Method
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Area of Science:

  • Reproductive biology
  • Human embryology
  • Genetic engineering

Background:

  • Pronuclear transfer (PNT) is a technique used in assisted reproductive technology.
  • Early PNT in human embryos requires precise manipulation of pronuclei.

Purpose of the Study:

  • To describe a method for early pronuclear transfer (PNT) in human eggs.
  • To establish optimal timing and procedural steps for PNT.

Main Methods:

  • PNT performed shortly after the appearance of two pronuclei in fertilized human eggs.
  • Isolation of pronuclei as karyoplasts with minimal surrounding cytoplasm.
  • Fusion of pronuclei-derived karyoplasts with enucleated fertilized eggs.

Main Results:

  • The described PNT method is technically feasible in human eggs.
  • Approximately 90% survival rate of manipulated fertilized eggs achieved by experienced individuals.

Conclusions:

  • Early PNT is a viable technique for human egg manipulation.
  • High survival rates indicate the potential efficacy of this method in reproductive applications.