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Related Concept Videos

Complement System01:27

Complement System

11.0K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Complementation Tests00:49

Complementation Tests

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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.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Critical Region, Critical Values and Significance Level01:16

Critical Region, Critical Values and Significance Level

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The critical region, critical value, and significance level are interdependent concepts crucial in hypothesis testing.
In hypothesis testing, a sample statistic is converted to a test statistic using z, t, or chi-square distribution. A critical region is an area under the curve in  probability distributions demarcated by the critical value. When the test statistic falls in this region, it suggests that the null hypothesis must be rejected. As this region contains all those values of the...
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Critical Values01:31

Critical Values

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A critical value is a definite value obtained from a particular probability distribution at a predecided confidence level (or a predecided significance level) for a given population parameter. The critical value provides demarcation that separates the sample statistics that are likely to occur from the ones that are unlikely to occur based on the given probability distribution and the population parameter to be estimated. The critical value for normal distribution is obtained from the z...
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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Critical Thinking01:19

Critical Thinking

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Critical thinking involves reflective and productive thinking and the evaluation of evidence. Critical thinkers seek to understand the deeper meaning of ideas, question assumptions, and make independent decisions about what to believe or do. Scientists, for instance, are often critical thinkers. Critical thinking also requires humility about what we know and don't know and the motivation to look beyond the obvious. It is essential for effective problem-solving.
Colleges and universities are...
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Related Experiment Video

Updated: Feb 13, 2026

Culturing of Retinal Pigment Epithelial Cells on an Ex Vivo Model of Aged Human Bruch's Membrane
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Culturing of Retinal Pigment Epithelial Cells on an Ex Vivo Model of Aged Human Bruch's Membrane

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The Complement System Is Critical in Maintaining Retinal Integrity during Aging.

Ryo Mukai1,2, Yoko Okunuki1, Deeba Husain1

  • 1Angiogenesis Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Harvard University, Boston, MA, United States.

Frontiers in Aging Neuroscience
|March 3, 2018
PubMed
Summary
This summary is machine-generated.

The complement system is crucial for maintaining retinal health during aging. Its absence leads to decreased retinal function and thinning of the inner nuclear layer in adult mice.

Keywords:
EMERGOCTagingcomplement systemretina

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Related Experiment Videos

Last Updated: Feb 13, 2026

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Area of Science:

  • Immunology
  • Neuroscience
  • Ophthalmology

Background:

  • The complement system, a vital part of innate immunity, orchestrates proteolytic cascades for cellular clearance.
  • While implicated in various inflammatory conditions and focal ocular diseases, its specific role in age-related retinal homeostasis remains unclear.

Purpose of the Study:

  • To investigate the role of the complement system in maintaining retinal integrity during aging.
  • To assess the impact of complement deficiencies on retinal function and structure in aging mice.

Main Methods:

  • Comparative analysis of young and adult wild-type and complement knockout mice (C1q, Mbl a/c, Fb, C3, C5).
  • Assessment of retinal function using electroretinograms (ERG).
  • Measurement of retinal layer thickness via spectral domain optical coherence tomography (SD-OCT).

Main Results:

  • Adult mice with complement deficiencies exhibited significantly decreased ERG amplitudes compared to young counterparts.
  • Significant thinning of the inner nuclear layer (INL) was observed in adult complement knockout mice.
  • No significant age-related changes in ERG amplitude or INL thickness were found in control mice.

Conclusions:

  • The complement system plays a critical role in preserving normal retinal integrity throughout the aging process.
  • Complement deficiencies accelerate age-related functional and structural decline in the retina.
  • These findings highlight the complement system as a potential target for age-related retinal diseases.