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Related Concept Videos

Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

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Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
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Agonism and Antagonism: Quantification01:14

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When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
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Sampling Theorem01:15

Sampling Theorem

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In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Sampling Plans01:23

Sampling Plans

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
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Sample Handling01:02

Sample Handling

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Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
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Related Experiment Video

Updated: Jan 27, 2026

Genotyping and Quantification of In Situ Hybridization Staining in Zebrafish
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Quantification and Genotyping of Trace Samples.

L Song1, S Liu1, H Wu1

  • 1Department of Criminal Science and Technology, Xihu District Branch of Hangzhou Public Security Bureau, Hangzhou 310013, China.

Fa Yi Xue Za Zhi
|March 22, 2019
PubMed
Summary
This summary is machine-generated.

Real-time PCR enhances trace sample screening by establishing a quantitative threshold model. This method improves the effectiveness of traditional DNA extraction for forensic analysis.

Keywords:
forensic genetics; tandem repeat sequences; real-time fluorescence quantification; trace samples

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Area of Science:

  • Forensic Science
  • Molecular Biology

Background:

  • Traditional trace sample extraction methods can be limited in effectiveness.
  • Real-time polymerase chain reaction (PCR) offers potential for improved sample screening.

Purpose of the Study:

  • To integrate real-time PCR into initial sample screening.
  • To enhance the effectiveness of traditional trace sample extraction techniques.

Main Methods:

  • Serial dilutions of 9947A were quantified using real-time RT-PCR.
  • Genotyping was performed with AmpFℓSTR Identifiler Plus PCR kit.
  • A quantitative threshold model was developed for STR typing of trace samples, with validation on 903 samples.

Main Results:

  • Effective STR typing was achieved directly for samples with quality concentration >0.03 ng/μL.
  • Optimizing PCR parameters (30 cycles) allowed effective STR typing for concentrations between >0.01 and ≤0.03 ng/μL.
  • Samples with concentrations ≤0.01 ng/μL yielded no effective typing, even with optimized PCR.

Conclusions:

  • The developed real-time PCR quantitative threshold model is effective for screening trace samples.
  • This approach improves the reliability and efficiency of DNA analysis from limited biological material.