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What are Viruses?

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Design of Transmission Shafts01:16

Design of Transmission Shafts

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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
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Transmission Line Design Considerations01:23

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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Transmission-Line Differential Equations01:26

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Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Related Experiment Video

Updated: Feb 3, 2026

Modeling The Lifecycle Of Ebola Virus Under Biosafety Level 2 Conditions With Virus-like Particles Containing Tetracistronic Minigenomes
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Modeling Ebola Virus Transmission Using Ferrets.

Marc-Antoine de La Vega1, Geoff Soule2, Kaylie N Tran2

  • 1Département de microbiologie-infectiologie et d'immunologie, Université Laval, Quebec City, Quebec, Canada.

Msphere
|November 2, 2018
PubMed
Summary
This summary is machine-generated.

Ferrets can model Ebola virus (EBOV) transmission, showing spread through direct and indirect contact. This new animal model helps understand EBOV spread in humans during outbreaks.

Keywords:
Ebola virusanimal modelsferretfilovirustransmission

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Area of Science:

  • Virology
  • Infectious Diseases
  • Epidemiology

Background:

  • Ebola virus (EBOV) causes severe outbreaks with limited understanding of transmission dynamics.
  • Current knowledge of EBOV transmission relies on contact with infectious bodily fluids, but transmission parameters remain undefined.
  • A suitable animal model is crucial for studying EBOV spread mechanisms.

Purpose of the Study:

  • To investigate Ebola virus (EBOV) transmissibility in a ferret model.
  • To establish a small animal model for studying EBOV transmission dynamics.
  • To explore direct and indirect contact transmission routes of EBOV.

Main Methods:

  • Male and female ferrets were intranasally challenged with EBOV.
  • Direct and indirect contact transmission were assessed by housing naive ferrets with infected animals.
  • Disease progression, viremia, and antibody responses (IgM/IgG) were monitored.

Main Results:

  • EBOV transmitted via both direct and indirect contact in ferrets.
  • Indirect contact transmission was frequent, leading to detectable antibodies, and sometimes severe disease.
  • Ferrets that survived indirect exposure developed specific antibodies, mirroring human exposure patterns.

Conclusions:

  • Ferrets provide a viable small-animal model for studying EBOV transmission without viral adaptation.
  • The model demonstrates frequent EBOV transmission via indirect contact, offering insights into human epidemic spread.
  • This research aids in understanding EBOV transmission parameters and informing public health strategies.