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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Convergent Evolution01:54

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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pre-mRNA Processing02:01

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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Eukaryotic Evolution01:24

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Aneurysm II: Clinical Manifestations and Diagnostic Studies01:21

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Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
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Related Experiment Video

Updated: Feb 16, 2026

A Pre-clinical Rat Model for the Study of Ischemia-reperfusion Injury in Reconstructive Microsurgery
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Microbeam evolution: from single cell irradiation to pre-clinical studies.

Mihaela Ghita1, Cristian Fernandez-Palomo2, Hisanori Fukunaga1

  • 1a Centre for Cancer Research and Cell Biology , Queen's University Belfast , Belfast , UK.

International Journal of Radiation Biology
|January 9, 2018
PubMed
Summary

Radiation microbeam technology has evolved from single cell studies to in vivo treatments. This review highlights microbeam applications, focusing on pre-clinical research and translation to clinical Microbeam Radiotherapy (MRT).

Keywords:
DNA damageMRTMicrobeambystander effects of radiation

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Area of Science:

  • Radiobiology
  • Medical Physics
  • Radiation Oncology

Background:

  • Microbeam technology enables precise radiation delivery to individual cells or subcellular organelles.
  • Micro-irradiation techniques are crucial for exploring fundamental radiobiological response mechanisms.
  • Advancements in microbeam facilities worldwide allow for precisely defined beams of charged particles, X-rays, or electrons.

Purpose of the Study:

  • To review the developmental trajectory of microbeam technology.
  • To discuss various microbeam applications, emphasizing pre-clinical research.
  • To explore the translation of microbeam technology towards clinical applications.

Main Methods:

  • Review of literature on microbeam technology development and applications.
  • Analysis of microbeam capabilities for cellular and in vivo studies.
  • Examination of the transition towards therapeutic modalities like Microbeam Radiotherapy (MRT).

Main Results:

  • Microbeams serve as mechanistic probes for DNA damage response pathways.
  • Precise dose delivery facilitates the study of localized radiation effects.
  • Microbeam technology has paved the way for novel radiotherapy approaches.

Conclusions:

  • Microbeam technology has significantly advanced radiobiological research.
  • The precision of microbeams supports the development of targeted therapeutic strategies.
  • Microbeam Radiotherapy (MRT) represents a promising clinical translation of this technology.