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Related Concept Videos

Couple01:29

Couple

A couple is a pair of parallel forces equal in magnitude but in opposite directions. The forces are separated by a perpendicular distance, known as the couple's arm. The couple causes a rotation force or moment that rotates the body about an axis perpendicular to the plane of the forces. The resulting moment is referred to as the couple moment. The SI unit of a couple moment is the Newton-meter (N-m).
A typical example to understand this concept is tightening a bolt with a lug wrench. A force...
Equivalent Couples01:28

Equivalent Couples

In mechanical engineering, the concept of equivalent couples plays a crucial role in understanding and analyzing various mechanical systems.
Two couples are considered to be equivalent if they produce the same rotational effect on a rigid body. In other words, the two couples have the same magnitude and act in the same direction, causing the same angular displacement or acceleration in the body.
For instance, consider two couples lying in the plane of the page, with one having a pair of equal...
Comparing Experimental Results: Student's t-Test01:09

Comparing Experimental Results: Student's t-Test

The t-test is a statistical method used to compare the sample mean with a population mean or compare two means from two data sets. The test statistic is calculated from the standard deviation, mean, and number of measurements in the data set at a selected confidence interval and then compared to a table of critical values at this confidence level. If the test statistic is smaller than the critical value, the null hypothesis is accepted. In this case, we state that the difference between the...
The Swing Equation01:21

The Swing Equation

The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque (Τe)...
Consecutive Reactions01:22

Consecutive Reactions

Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

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Updated: May 15, 2026

Community-based Adapted Tango Dancing for Individuals with Parkinson's Disease and Older Adults
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Community-based Adapted Tango Dancing for Individuals with Parkinson's Disease and Older Adults

Published on: December 9, 2014

It takes more than two for this tango.

Leonid Margolis

    Cell Host & Microbe
    |January 22, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Herpes simplex virus type 2 (HSV-2) infected skin cells release a protein that boosts human immunodeficiency virus type 1 (HIV-1) infection of Langerhans cells. This finding may explain how HSV-2 facilitates HIV-1 acquisition in humans.

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    Area of Science:

    • Immunology
    • Virology
    • Dermatology

    Background:

    • Herpes simplex virus type 2 (HSV-2) infection is a known risk factor for acquiring human immunodeficiency virus type 1 (HIV-1).
    • The precise mechanisms by which HSV-2 facilitates HIV-1 acquisition remain incompletely understood.

    Discussion:

    • This study identifies a specific mechanism involving HSV-2-infected keratinocytes.
    • These keratinocytes release a protein that enhances the susceptibility of Langerhans cells to HIV-1 infection.
    • This protein acts as a bridge, potentially increasing viral entry and replication.

    Key Insights:

    • HSV-2-infected keratinocytes secrete a soluble factor that promotes HIV-1 infection.
    • Langerhans cells, key immune cells in the skin, become more vulnerable to HIV-1 upon exposure to this factor.
    • The findings provide a molecular explanation for the epidemiological link between HSV-2 and HIV-1 acquisition.

    Outlook:

    • Further research should focus on identifying the specific protein responsible for enhancing HIV-1 infection.
    • Therapeutic strategies could be developed to block this protein's activity, potentially reducing HIV-1 transmission in HSV-2 co-infected individuals.
    • Understanding this interaction is crucial for developing effective prevention and treatment approaches for sexually transmitted infections.