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• Summary
• Table of Contents

Introduction

• Introduction
• The Problem

Theory

• Photosynthesis
• Delayed Fluorescence
• Photosynthetic Herbicides

The method

• Treatment
• Registration
• Analysis

Reference

• Literature
• Abbreviations
• Index of Figures
• Links

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Analysis of the Results

Dose-response curves

The dose-response relationship can be obtained by measuring the effect of the herbicide (response) at a set of different concentrations (doses). As a measure of the effect we use the amplitude of the I₄ peak of the DFIC. The dose-response curve can be approximated to a sigmoidal function whose upper assymptote corresponds to untreated samples and the lower assymptote to samples with fully inhibited electron transport.

The dose-response curve provides a mean to estimate the concentration of half-inhibition, or its negative logarithm - the index of half-inhibition, pI₅₀. The higher pI₅₀ is, the more sensitive is the plant towards the given herbicide (or the more effective is the herbicide in the given plant).