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Genetic Material01:20

Genetic Material

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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Members Made of Elastoplastic Material01:19

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Bending of Members Made of Several Materials01:11

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Bending of Material: Problem Solving01:09

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Circular Shafts - Elastoplastic Materials01:24

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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Hybrid Printing for the Fabrication of Smart Sensors
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A Paper Sensor Printed with Multifunctional Bio/Nano Materials.

Christy Y Hui1, Meng Liu1,2,3, Yingfu Li1,2

  • 1Biointerfaces Institute, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4O3, Canada.

Angewandte Chemie (International Ed. in English)
|March 6, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel paper-based aptasensor for sensitive detection of biomarkers. The platform utilizes dual reaction zones and printed nanomaterials for efficient molecular recognition and signal amplification, enabling equipment-free diagnostics.

Keywords:
Clostridium difficileaptamergraphene oxidepaper diagnosticsrolling circle amplification

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Area of Science:

  • Biosensors and Nanotechnology
  • Molecular Diagnostics
  • Point-of-Care Testing

Background:

  • Development of sensitive and specific diagnostic tools is crucial for early disease detection.
  • Existing methods often require complex equipment and trained personnel, limiting accessibility.
  • Paper-based platforms offer a low-cost, portable, and user-friendly alternative for diagnostics.

Purpose of the Study:

  • To develop and validate a paper-based aptasensor platform for molecular recognition and signal amplification.
  • To demonstrate the platform's capability in detecting clinically relevant biomarkers.
  • To enable equipment-free or smartphone-based detection for point-of-care applications.

Main Methods:

  • A paper-based platform with two reaction zones and a connecting bridge was designed.
  • Printed graphene oxide and multifunctional bio/nano materials were utilized for aptamer immobilization and signal generation.
  • Fluorescently labeled aptamers were released upon analyte binding, initiating rolling circle amplification.
  • DNA amplicons with peroxidase-mimicking DNAzyme activity generated a colorimetric readout.

Main Results:

  • The aptasensor demonstrated high sensitivity and specificity for detecting adenosine triphosphate and glutamate dehydrogenase.
  • Successful detection of targets was achieved in spiked serum and fecal samples.
  • The colorimetric readout was compatible with both equipment-free visual inspection and smartphone-based analysis.

Conclusions:

  • The developed paper-based aptasensor platform offers a promising approach for sensitive and specific biomarker detection.
  • The platform's design facilitates molecular recognition and signal amplification for point-of-care diagnostics.
  • This technology holds potential for the analysis of clinical samples and accessible disease screening.