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Related Concept Videos

Mass Spectrometry: Alcohol Fragmentation01:03

Mass Spectrometry: Alcohol Fragmentation

Alcohols (R-OH) ionize to lose one non-bonded electron from the oxygen atom, forming molecular ions. Due to their tendency to fragment rapidly, the intensity of the molecular ion peak in the mass spectrum is weak or sometimes absent. The fragmentation patterns for alcohols occur in two ways, i.e. ⍺-cleavage and dehydration. During ⍺-cleavage, the bond at the ⍺-position adjacent to the hydroxyl group cleaves to give a resonance-stabilized cation and a radical. However, intramolecular dehydration...
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Protection
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Hypothesis Test for Test of Independence01:16

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The test of independence is a chi-square-based test used to determine whether two variables or factors are independent or dependent. This hypothesis test is used to examine the independence of the variables. One can construct two qualitative survey questions or experiments based on the variables in a contingency table. The goal is to see if the two variables are unrelated (independent) or related (dependent). The null and alternative hypotheses for this test are:
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Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

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Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.

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Updated: Jul 6, 2026

Modeling Alcohol Consumption in Rodents Using Two-Bottle Choice Home Cage Drinking and Microstructural Analysis
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Published on: November 8, 2024

Alcohol outlet density and assault: a spatial analysis.

Michael Livingston1

  • 1AER Centre for Alcohol Policy Research, Turning Point Alcohol and Drug Centre, Fitzroy, Australia. michaell@turningpoint.org.au

Addiction (Abingdon, England)
|March 15, 2008
PubMed
Summary
This summary is machine-generated.

Higher alcohol outlet density is linked to more assaults, with the relationship being non-linear. This suggests critical density limits for licensing policy to reduce crime.

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Area of Science:

  • Criminology
  • Urban Planning
  • Public Health

Background:

  • Numerous studies indicate a correlation between the concentration of alcohol retailers and local assault rates.
  • Existing research often assumes a linear relationship, potentially overlooking complex dynamics.

Purpose of the Study:

  • To investigate the nature of the relationship between alcohol outlet density and assault rates.
  • To specifically test for non-linear associations, including potential threshold or saturation effects.

Main Methods:

  • Utilized cross-sectional data from 223 Melbourne postcodes, including police-recorded assaults and liquor outlet data.
  • Employed statistical modeling to analyze the association between outlet density and assault, controlling for socio-demographic factors and spatial autocorrelation.
  • Examined linear, non-linear, socio-economic, and spatial lag models to determine the best fit.

Main Results:

  • A non-linear model demonstrated a superior fit to the data compared to linear models.
  • Found an increasing, accelerating effect of hotel (pub) license density on assault rates.
  • Identified potential upper limits for liquor licenses in Melbourne postcodes based on the observed relationship.

Conclusions:

  • Confirmed a positive, non-linear relationship between alcohol outlet density and assault rates.
  • The findings suggest critical density thresholds exist, informing evidence-based licensing policies.
  • Provides a basis for policymakers to establish effective density limits for alcohol outlets to mitigate violence.