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Transfer RNA Synthesis02:36

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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.
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Mechanisms of Heat Transfer I01:14

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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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Minimally Invasive Embryo Transfer and Embryo Vitrification at the Optimal Embryo Stage in Rabbit Model
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Single embryo transfer for all.

Rachel Cutting1

  • 1Jessop Fertility, Jessop Wing, Sheffield Teaching Hospitals NHS Foundation Trust, Tree Root Walk, Sheffield, S10 2SF, UK.

Best Practice & Research. Clinical Obstetrics & Gynaecology
|August 15, 2018
PubMed
Summary
This summary is machine-generated.

Reducing multiple pregnancies from assisted reproductive technology is crucial. This chapter questions if single embryo transfer (SET) is now viable for all patients, given advancements in embryo culture and selection.

Keywords:
BlastocystEmbryo selectionIVFMultiple pregnancySingle embryo transferTwins

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Area of Science:

  • Reproductive Medicine
  • Obstetrics & Gynecology

Background:

  • Multiple pregnancies following assisted reproductive technology (ART) pose significant risks.
  • Current strategies for minimizing multiple births focus on identifying high-risk patients.

Purpose of the Study:

  • To evaluate the current feasibility and appropriateness of single embryo transfer (SET) for all ART patients.
  • To discuss the impact of recent advancements on embryo selection and cryopreservation.

Main Methods:

  • Review of current multiple birth minimization strategies in ART.
  • Analysis of advancements in embryo culture, selection, and cryopreservation techniques.

Main Results:

  • Improvements in ART technologies enhance embryo viability and selection accuracy.
  • Existing risk-prediction models may need re-evaluation in light of these advancements.

Conclusions:

  • The chapter posits that advancements in ART may warrant a shift towards universal single embryo transfer (SET).
  • Further discussion is needed to determine if SET is currently optimal for all patient demographics undergoing ART.