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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Asthma I: Introduction01:28

Asthma I: Introduction

Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
Asthma-I: Introduction01:29

Asthma-I: Introduction

Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Related Experiment Video

Updated: Jun 4, 2026

A Component-resolved Diagnostic Approach for a Study on Grass Pollen Allergens in Chinese Southerners with Allergic Rhinitis and/or Asthma
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Ragweed pollen in France: origin, diffusion, exposure.

M Thibaudon1, C Hamberger, L Guilloux

  • 1RNSA, Saint-Genis l'Argentière, 69610, France. rnsa@rnsa.fr

European Annals of Allergy and Clinical Immunology
|February 4, 2011
PubMed
Summary
This summary is machine-generated.

This study tracked ragweed pollen and allergic patient sensitivity in France. Findings correlate pollen distribution with specific IgE levels, aiding future allergy predictions.

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Last Updated: Jun 4, 2026

A Component-resolved Diagnostic Approach for a Study on Grass Pollen Allergens in Chinese Southerners with Allergic Rhinitis and/or Asthma
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08:47

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Published on: March 3, 2023

Area of Science:

  • Aerobiology
  • Allergology
  • Epidemiology

Background:

  • Ragweed pollen is a significant allergen.
  • Understanding pollen origin and patient sensitization is crucial for public health.
  • Existing monitoring networks provide valuable data.

Purpose of the Study:

  • To determine the geographical origin of ragweed pollen in France.
  • To measure the impact of ragweed pollen exposure on allergic patients.
  • To inform the public about ragweed pollen allergies.

Main Methods:

  • Utilized the R.N.S.A. pollen trap network for continuous airborne pollen recording.
  • Analyzed pollen samples using light microscopy to determine daily concentrations and circadian rhythms.
  • Statistically analyzed specific IgE (sIgEw1) data from Biomnis laboratories to identify sensitized individuals.

Main Results:

  • Compared the distribution of ragweed-sensitized patients with pollen distribution data from 2005-2008.
  • Accounted for both locally sourced and wind-imported ragweed pollen.
  • Established a correlation between pollen distribution and patient sensitization.

Conclusions:

  • A biological database links ragweed pollen distribution to specific IgE levels, indicating local sensitization.
  • This correlation allows for the estimation of future allergy cases.
  • Sensitivity to ragweed pollen precedes the development of clinical allergy.