Related Experiment Video
Updated: Jun 19, 2026
08:22
Studying Copper Nanoparticle-Induced Programmed Cell Death in Bacteria
Published on: May 16, 2025
THE TOXIC ACTION OF COPPER ON NITELLA.
1Laboratory of Plant Physiology, Harvard University, Cambridge.
The Journal of General Physiology
|October 30, 2009
Summary
Copper chloride toxicity in Nitella cells follows a sigmoid curve, with toxic effects proportional to a fractional power of copper concentration. Temperature variations reveal complex interactions affecting toxicity.
Area of Science:
- Environmental toxicology
- Plant physiology
Background:
- Copper chloride is a known toxicant.
- Nitella cells are a model organism for toxicity studies.
Purpose of the Study:
- To characterize the toxicity curve of copper chloride in Nitella.
- To investigate the relationship between copper concentration, temperature, and toxic effects.
Main Methods:
- Assessing cell turgidity loss as a toxicity criterion.
- Developing empirical equations to fit toxicity curves.
- Analyzing survivor curves at varying copper concentrations and temperatures.
Main Results:
- The copper chloride toxicity curve for Nitella is sigmoid.
- Toxic effects correlate with a fractional power of copper concentration.
- Temperature variations result in intersecting curves when plotting toxicity response.
Conclusions:
- An empirical model can approximate copper chloride toxicity in Nitella.
- The fractional power law describes the dose-response relationship.
- Temperature significantly modulates the toxic action of copper chloride.
More Related Videos
Related Concept Videos
01:17Antidotes
Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...
01:26Toxic Reactions: Overview
When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
01:25Bioactivation and Tissue Toxicity
Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
01:26Physical Properties of Amines
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
01:24Drug Toxicity: Dose-Dependent Reactions
Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
01:36Types of Toxins
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...