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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.9K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain01:27

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain Energy01:13

Strain Energy

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Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
1.0K
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

2.0K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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Stress-Strain Diagram01:10

Stress-Strain Diagram

3.0K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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High Throughput Yeast Strain Phenotyping with Droplet-Based RNA Sequencing
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Characterization of MRSA strains by phenotypic and OCR-based methods.

Cãtãlina Luncã, Luminiþa Smaranda Iancu, Teodora Vremerã

    Roumanian Archives of Microbiology and Immunology
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    PubMed
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    Molecular characterization of Methicillin-Resistant Staphylococcus aureus (MRSA) strains using PCR methods aids in controlling spread. PBP2 detection offers a rapid screening alternative for laboratories lacking advanced molecular diagnostic facilities.

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    Area of Science:

    • Microbiology
    • Epidemiology
    • Molecular Biology

    Background:

    • Emergence of new Methicillin-Resistant Staphylococcus aureus (MRSA) strains necessitates molecular characterization for effective control.
    • Understanding the dynamics and sources of MRSA dissemination in both hospital and community settings is crucial for public health.

    Purpose of the Study:

    • To analyze MRSA isolates using PCR-based methods for improved epidemiological surveillance.
    • To identify the molecular characteristics, including specific genes and SCCmec types, of circulating MRSA strains.
    • To correlate these molecular findings with clinical characteristics and multidrug resistance (MDR).

    Main Methods:

    • Analysis of 86 MRSA isolates using PCR-based methods.
    • Assessment of mecA, nuc, lukF-PV, and lukS-PV genes.
    • Determination of SCCmec types.
    • Comparison of PBP2 detection with PCR for MRSA screening.

    Main Results:

    • 51% of multidrug-resistant (MDR) MRSA strains carried SCCmec IV mobile genetic elements.
    • The majority of non-MDR SCCmec type IV strains were Panton-Valentine Leukocidin (PVL)-positive (81.8%).
    • PBP2 detection was identified as a useful alternative to PCR for rapid MRSA screening in resource-limited laboratories.

    Conclusions:

    • Molecular characterization of MRSA strains is essential for controlling dissemination and identifying infection sources.
    • SCCmec type IV is prevalent in MDR MRSA strains, and PVL is common in non-MDR SCCmec type IV strains.
    • PBP2 detection provides a valuable, accessible method for MRSA screening, complementing molecular diagnostics.