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Related Concept Videos

Uncertainty: Overview00:59

Uncertainty: Overview

In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
The Scientific Method03:50

The Scientific Method

Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions. To achieve this, scientists follow a definitive series of steps that together make up the Scientific Method. This approach involves making observations, asking questions, building a hypothesis, conducting experiments, analyzing results, and forming a conclusion.
Scientific Nature of Social Psychology01:30

Scientific Nature of Social Psychology

Social psychology is a scientific discipline dedicated to understanding how individuals think, feel, and behave in social contexts. Unlike common sense, which relies on anecdotal experiences and intuition, social psychology employs systematic research and empirical methods to ensure objectivity and reliability. This distinction is fundamental in distinguishing scientifically supported findings from mere speculation.Four fundamental scientific values guide a structured approach to research in...
Effects of Chemicals: Overview01:27

Effects of Chemicals: Overview

Drugs, encompassing various chemical compounds from natural sources, lab synthesis, or genetic engineering, elicit different biological responses in living organisms. Some of these responses are desirable or therapeutic, while others are undesirable. The primary goal of administering a drug is to achieve a therapeutic effect, that is, to address a specific disease or health condition. Any concurrent effects outside of this therapeutic outcome are considered undesirable. These undesirable...

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Updated: Jun 1, 2026

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Peer Reviewed: Science, Uncertainty, and EPA's New Ozone Standards.

A S Lefohn

    Environmental Science & Technology
    |June 10, 2011
    PubMed
    Summary

    Ozone exposure poses risks to human health and plant life, but the precise scientific mechanisms remain unclear. Further research is needed to fully understand these environmental and health impacts.

    Area of Science:

    • Environmental science
    • Toxicology
    • Plant physiology

    Background:

    • Ground-level ozone is a harmful air pollutant.
    • Ozone's detrimental effects on human health and vegetation are documented.
    • Specific pathways and thresholds for harm are not fully elucidated.

    Purpose of the Study:

    • To identify and clarify the scientific uncertainties regarding ozone's impact on human health.
    • To investigate the mechanisms through which ozone affects vegetation.
    • To address the existing knowledge gaps in ozone toxicology and phytopathology.

    Main Methods:

    • Review of existing epidemiological studies on ozone and human health.
    • Analysis of controlled exposure experiments on various plant species.

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    In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure
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    In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure

    Published on: October 22, 2019

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    Published on: September 7, 2019

    Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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    Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

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    In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure

    Published on: October 22, 2019

  • Synthesis of data from atmospheric chemistry and biological impact assessments.

    • Main Results:

    • Significant correlations observed between ozone levels and respiratory issues in humans.
    • Evidence of ozone-induced oxidative stress and damage in sensitive plant tissues.
    • Identification of specific ozone concentrations that trigger adverse effects in vulnerable populations and plant types.

    Conclusions:

    • Ozone pollution presents a considerable threat to public health and agricultural productivity.
    • Further research is essential to refine risk assessments and develop effective mitigation strategies.
    • Understanding ozone's complex interactions with biological systems is crucial for environmental protection.