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Related Concept Videos

Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
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Random and Systematic Errors

Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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Errors and mistakes in surveying refer to inaccuracies in measurements and data recording. The errors are deviations from the actual value caused by human sensory limitations, equipment flaws, or environmental effects. These errors are typically unintentional and can result from the inherent imperfections in the instruments used, atmospheric conditions, or the observer’s inability to perceive exact measurements. On the other hand, mistakes are caused by the surveyor's lack of attention,...
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Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement
06:33

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Published on: July 29, 2013

Not being the wrong size.

R H Gomer1

  • 1Howard Hughes Medical Institute and Department of Biochemistry and Cell Biology MS-140, Rice University, 6,100 South Main Street, Houston, Texas 77005-1892, USA. richard@bioc.rice.edu

Nature Reviews. Molecular Cell Biology
|June 20, 2001
PubMed
Summary
This summary is machine-generated.

Organisms maintain specific sizes through complex biological programming. Understanding these size regulation mechanisms is crucial in developmental biology to prevent abnormal growth.

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Area of Science:

  • Developmental biology
  • Cell biology
  • Organismal development

Background:

  • Organismal size and tissue proportions are fundamental aspects of biology.
  • Deviations from normal size can indicate underlying developmental issues.
  • Understanding size regulation is key to addressing developmental abnormalities.

Purpose of the Study:

  • To explore the fundamental biological question of how multicellular structures achieve and maintain a specific size.
  • To identify the key mechanisms governing size regulation in biological systems.
  • To understand the developmental processes that determine organismal and tissue dimensions.

Main Methods:

  • This study focuses on the conceptual framework and existing literature regarding size regulation.
  • It synthesizes principles from developmental biology and cell biology.
  • The approach involves analyzing established models and theories of growth and size control.

Main Results:

  • Size regulation is a complex, multi-faceted problem in developmental biology.
  • Multiple mechanisms likely interact to control the size of organisms and their tissues.
  • Disruptions in these mechanisms can lead to abnormal size development.

Conclusions:

  • Elucidating the precise mechanisms of size regulation is essential for understanding normal development.
  • Further research is needed to fully characterize the molecular and cellular pathways involved in size control.
  • Addressing size-related developmental problems requires a comprehensive understanding of these regulatory processes.