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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Related Experiment Video

Updated: Jan 25, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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Whole-body PET/MRI of Pediatric Patients: The Details That Matter

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Patient Stakeholder Versus Physician Preferences Regarding Amyloid PET Testing.

Melissa J Armstrong1, Gary S Gronseth2, Gregory S Day3

  • 1Department of Neurology, McKnight Brain Institute, University of Florida College of Medicine, Gainesville, FL.

Alzheimer Disease and Associated Disorders
|May 7, 2019
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Summary

Patients and caregivers prioritize dementia diagnosis and value amyloid PET testing for asymptomatic individuals more than clinicians do. This highlights the need for research on testing effects and disclosure standards.

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Area of Science:

  • Neurology
  • Medical Imaging
  • Patient-Centered Care

Background:

  • Patient and caregiver perspectives on amyloid positron emission tomography (PET) use are under-researched compared to clinician views.
  • Understanding these perspectives is crucial for developing comprehensive guidelines for amyloid PET utilization.

Purpose of the Study:

  • To compare patient and caregiver views with clinician perspectives on amyloid PET use.
  • To inform an evidence-based guideline on amyloid PET utilization.

Main Methods:

  • A survey was conducted among clinicians, patients, caregivers, and dementia advocates.
  • Participants rated the importance of various topics related to amyloid PET guidelines.
  • Statistical comparison (Mann-Whitney U test) was used to analyze differences between patient representatives and clinicians.

Main Results:

  • Patient representatives rated most topics as important as or more important than clinicians.
  • Differences were most pronounced regarding the value of testing asymptomatic individuals and managing false-positive/false-negative results.
  • Patients and caregivers emphasized diagnosis importance and outcomes for asymptomatic populations.

Conclusions:

  • Patient and caregiver priorities differ from clinician views, particularly concerning asymptomatic individuals.
  • Further research is needed on the impact of amyloid PET results in asymptomatic populations.
  • Establishing clear standards for ordering and disclosing amyloid PET results is essential.