Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Dose-Response Relationship: Potency and Efficacy01:22

Dose-Response Relationship: Potency and Efficacy

The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it produces...
Dose-Response Relationship: Overview01:03

Dose-Response Relationship: Overview

Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
Dose Response Curve: Conventional Versus Nonmonotonic01:21

Dose Response Curve: Conventional Versus Nonmonotonic

The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response relationships...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
Agonism and Antagonism: Quantification01:14

Agonism and Antagonism: Quantification

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Thirty years of glyphosate-resistant crops and weeds: Current situation and future prospects.

Pest management science·2026
Same author

Robots with lasers for weed control - photonic weed management.

Pest management science·2025
Same author

Origins of new modes of action for fungicides, herbicides and insecticides: a review and analysis.

Pest management science·2025
Same author

Isoxazoline: An Emerging Scaffold in Pesticide Discovery.

Journal of agricultural and food chemistry·2025
Same author

Effects of glyphosate on antibiotic resistance in soil bacteria and its potential significance: A review.

Journal of environmental quality·2024
Same author

Characterization of the Phytotoxic Potential of Seven <i>Copaifera</i> spp. Essential Oils: Analyzing Active Compounds through Gas Chromatography-Mass Spectrometry Molecular Networking.

Journal of agricultural and food chemistry·2024
Same journal

Whole-range assessment: a simple method for analysing allelopathic dose-response data.

Nonlinearity in biology, toxicology, medicine·2009
Same journal

Implementation of card: curve-fitting allelochemical response data.

Nonlinearity in biology, toxicology, medicine·2009
Same journal

Modeling the effect of density-dependent chemical interference upon seed germination.

Nonlinearity in biology, toxicology, medicine·2009
Same journal

Mathematical Modelling of Allelopathy: IV. Assessment of Contributions of Competition and Allelopathy to Interference by Barley.

Nonlinearity in biology, toxicology, medicine·2009
Same journal

Mathematical modelling of dose-response relationship (hormesis) in allelopathy and its application.

Nonlinearity in biology, toxicology, medicine·2009
Same journal

The search for non-linear exposure-response relationships at ambient levels in environmental epidemiology.

Nonlinearity in biology, toxicology, medicine·2009
See all related articles

Related Experiment Video

Updated: Jun 24, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)
09:00

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)

Published on: January 28, 2020

Dose-response-a challenge for allelopathy?

Regina G Belz1, Karl Hurle, Stephen O Duke

  • 1University of Hohenheim, Institute of Phytomedicine 360, Department of Weed Science, Stuttgart, Germany.

Nonlinearity in Biology, Toxicology, Medicine
|March 31, 2009
PubMed
Summary
This summary is machine-generated.

Nonlinear dose-response relationships are key to understanding plant phytotoxicity and allelopathy. This study applies nonlinear regression to quantify allelopathic effects from pure compounds and living plants, revealing crucial insights.

Keywords:
benzoxazinoidshormesislog-logistic modelscopoletin

More Related Videos

Protocols for Robust Herbicide Resistance Testing in Different Weed Species
10:52

Protocols for Robust Herbicide Resistance Testing in Different Weed Species

Published on: July 2, 2015

Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay
10:49

Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay

Published on: September 7, 2015

Related Experiment Videos

Last Updated: Jun 24, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)
09:00

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)

Published on: January 28, 2020

Protocols for Robust Herbicide Resistance Testing in Different Weed Species
10:52

Protocols for Robust Herbicide Resistance Testing in Different Weed Species

Published on: July 2, 2015

Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay
10:49

Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay

Published on: September 7, 2015

Area of Science:

  • Plant Science
  • Ecology
  • Biochemistry

Background:

  • Dose-response relationships are fundamental in toxicology and biology.
  • Nonlinearity in dose-response is well-established for describing phytotoxicity mechanisms.
  • Allelopathy, involving plant-produced toxins, also exhibits nonlinear responses.

Purpose of the Study:

  • To apply the concept of nonlinearity to allelopathy using nonlinear regression models.
  • To present procedures for comparing effective doses in allelopathic interactions (inhibitory and stimulatory).
  • To demonstrate the applicability of dose-response principles to allelochemicals from pure compounds and living plants.

Main Methods:

  • Application of nonlinear regression models to analyze bioassays.
  • Dose-response experiments using pure allelochemicals (scopoletin, DIBOA, BOA, MBOA).
  • Dose-response experiments with living donor plants (oats, rye, wheat).

Main Results:

  • Nonlinear dose-response models adequately quantify allelopathic effects.
  • Effective doses of allelochemicals can be validly compared.
  • Principles of dose response apply to density-dependent phytotoxicity from living plants.

Conclusions:

  • Nonlinearity is a fundamental principle in allelopathy.
  • Dose-response experiments provide valuable insights into allelopathic interactions.
  • This approach allows for a quantitative understanding of plant-plant chemical communication.