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Related Concept Videos

Complement System01:27

Complement System

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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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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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Block Diagram Reduction01:22

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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Block diagrams serve as a visual representation of the input-output relationships within a system. An illustrative example is a heating system, where the set temperature activates the furnace to warm the room to the desired level. Block diagrams are versatile, modeling linear systems through Laplace transform variables and nonlinear systems using time domain variables.
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In a spring-mass-damper system, the second-order differential equation describes the dynamic behavior of the system. When transformed into the Laplace domain under zero initial conditions, this equation can be effectively analyzed and manipulated. The transformation into the Laplace domain converts differential equations into algebraic equations, simplifying the process of isolating the output.
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A Technique to Simultaneously Visualize Virus-Specific CD8+ T Cells and Virus-Infected Cells In situ
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Complement Seals a Virus to Block Infection.

Jason G Smith1, Glen R Nemerow2

  • 1Department of Microbiology, University of Washington School of Medicine, 750 Republican Street, Seattle, WA 98109, USA.

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Summary
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Complement component C4 inhibits adenovirus by disabling its outer shell, a process needing antibody help but not later complement steps. This finding offers insights into non-enveloped virus inactivation and disassembly.

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Area of Science:

  • Virology
  • Immunology
  • Complement System

Background:

  • Adenoviruses are non-enveloped viruses that cause various human diseases.
  • The complement system is a crucial part of innate immunity, aiding in pathogen clearance.
  • Mechanisms of adenovirus neutralization by the immune system are not fully understood.

Purpose of the Study:

  • To investigate the role of complement component C4 in adenovirus inhibition.
  • To elucidate the specific mechanisms by which C4 affects adenovirus infectivity.
  • To determine the involvement of antibody engagement and late complement pathways in C4-mediated antiviral activity.

Main Methods:

  • Adenovirus infection assays in cell culture.
  • Complement component C4 functional assays.
  • Analysis of virus capsid integrity and disassembly.
  • Investigation of antibody-dependent and independent complement activation.

Main Results:

  • Complement component C4 directly inhibits adenovirus infectivity.
  • C4 inactivates the adenovirus capsid, likely by promoting its disassembly.
  • This antiviral activity requires antibody engagement but is independent of late-acting complement pathways.
  • The findings suggest a broad role for C4 in controlling non-enveloped virus infections.

Conclusions:

  • Complement component C4 acts as a significant antiviral factor against adenovirus.
  • Antibody-mediated engagement of C4 is critical for its inhibitory function.
  • C4's role in virus disassembly may be a key mechanism for controlling non-enveloped viral infections.
  • This study highlights the importance of the early complement system in antiviral defense.