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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Sampling materials are classified into three main types: solid, liquid, and gas.
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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Related Experiment Video

Updated: Jan 29, 2026

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber
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Sampling Devices for Indoor Allergen Exposure: Pros and Cons.

Torie Grant1, Ana M Rule2, Kirsten Koehler2

  • 1Division of Pediatric Allergy/Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Current Allergy and Asthma Reports
|February 13, 2019
PubMed
Summary

This review examines indoor allergen sampling devices for dust and air, noting that while reservoir and airborne methods are popular, newer techniques like furnace filters show variable correlation. Personal devices offer better breathable air estimates but can be cumbersome.

Keywords:
Airborne allergen samplingAllergen in settled dustIndoor allergen exposureIndoor allergen samplingPersonal allergen samplersVacuum allergen sampling

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Area of Science:

  • Environmental Health
  • Allergen Monitoring
  • Indoor Air Quality

Background:

  • Indoor allergens significantly impact respiratory health.
  • Accurate allergen sampling is crucial for effective exposure reduction strategies.
  • Understanding allergen characteristics is key to selecting appropriate sampling methods.

Purpose of the Study:

  • To review current indoor allergen sampling devices.
  • Evaluate devices for reservoir dust, airborne dust, and personal sampling.
  • Analyze sampling rationale, allergen size, and characteristics.

Main Methods:

  • Literature review of indoor allergen sampling techniques.
  • Analysis of reservoir dust sampling (e.g., vacuuming).
  • Evaluation of airborne dust sampling (e.g., volumetric air sampling, furnace filters, ion-charging devices).
  • Assessment of personal sampling devices (e.g., intra-nasal, personal volumetric air samples).

Main Results:

  • Reservoir dust vacuuming and airborne dust volumetric air sampling are popular but have limitations.
  • Newer methods like furnace filters and ion-charging devices reduce staff training needs but show variable correlation.
  • Personal sampling devices may better estimate breathable allergens but are worn for short durations and can be cumbersome.
  • Reservoir dust sampling is cost-effective for families; airborne sampling can be more expensive but better quantifies specific pet allergens.

Conclusions:

  • No single indoor allergen sampling method is universally superior.
  • The choice of device depends on factors like cost, required accuracy, and target allergens.
  • Personal sampling devices show promise for assessing breathable allergen exposure, despite practical challenges.