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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Psychodynamic Perspectives on Personality01:27

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The psychodynamic perspective in psychology asserts that most personality functions operate unconsciously, outside of awareness. This means that the motives and emotions driving behavior often remain hidden, automatically buried in the unconscious mind as a defense mechanism to shield us from psychological distress. According to this theory, the unconscious mind contains thoughts, memories, and emotions that are too disturbing to face directly.
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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The Behavioral Perspective on Personality01:19

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Behaviorists view personality as primarily shaped by environmental reinforcements and consequences. According to this perspective, behavior is influenced by external stimuli, and individuals adjust their actions based on rewards and punishments. Over time, learning histories — accumulated patterns of reinforcement — play a significant role in shaping personality. Behaviors that lead to positive outcomes are reinforced, while those resulting in negative outcomes are diminished.
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A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter
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A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter

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Human exposure to polycyclic aromatic hydrocarbons: Metabolomics perspective.

Peng Gao1, Evandro da Silva2, Lei Hou3

  • 1Research Center for Soil Contamination and Environment Remediation, Southwest Forestry University, Kunming 650224, China; Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States.

Environment International
|July 23, 2018
PubMed
Summary
This summary is machine-generated.

This review explores human metabolic responses to polycyclic aromatic hydrocarbons (PAHs), environmental carcinogens. Understanding PAH metabolism is crucial for reducing their genotoxicity and carcinogenic effects in humans.

Keywords:
Animal modelsCarcinogenesis mechanismsHuman exposure biomarkersMetabolic pathwaysMetabolomics techniquesMultivariate statistical analysisPAHs

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Extraction of Aqueous Metabolites from Cultured Adherent Cells for Metabolomic Analysis by Capillary Electrophoresis-Mass Spectrometry
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Area of Science:

  • Environmental Health
  • Toxicology
  • Metabolomics

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental contaminants with known carcinogenic toxicity.
  • Human exposure to PAHs occurs through inhalation, ingestion, and dermal contact.
  • Limited knowledge exists regarding human metabolic responses to PAHs, despite their indirect-acting carcinogenic nature.

Purpose of the Study:

  • To review biomarkers, analytical techniques, statistical analysis, and animal models used to understand human metabolic responses to PAHs.
  • To provide a comprehensive view of metabolic reactions following PAH exposure.
  • To inform strategies for controlling PAH metabolism and reducing genotoxicity.

Main Methods:

  • Review of existing literature on biomarkers for PAH exposure and effects.
  • Discussion of analytical techniques such as nuclear magnetic resonance (NMR) and mass spectrometry (MS).
  • Examination of big data multivariate statistical analysis and animal models in PAH research.

Main Results:

  • PAHs require metabolic activation to exert their carcinogenic effects.
  • Metabolomics offers a comprehensive approach to studying biological responses to PAHs.
  • Various analytical and statistical methods are available for PAH metabolite identification and quantification.

Conclusions:

  • Understanding PAH metabolism in humans is critical for assessing and mitigating health risks.
  • Metabolomics plays a key role in elucidating the biological impact of PAHs and their derivatives.
  • Further research utilizing advanced analytical techniques and models is needed to fully understand PAH biotransformation and effects.