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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Volatilization01:10

Volatilization

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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Structures of Aldehydes and Ketones01:04

Structures of Aldehydes and Ketones

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Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
In aldehydes (Figures 1a and 1b),...
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Vaporization01:18

Vaporization

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The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Fungal volatile organic compounds.

Joan W Bennett1, Geromy G Moore2

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Volatile organic compounds (VOCs) are easily vaporized substances. This primer explores VOCs, focusing on their production by fungi and their roles in biological signaling and defense mechanisms.

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Area of Science:

  • Biochemistry
  • Mycology
  • Ecology

Background:

  • Volatile organic compounds (VOCs) are carbon-based, low molecular weight compounds readily entering the gaseous state.
  • Biogenic VOCs originate from living systems and exist in complex mixtures.
  • Organisms utilize these compounds as signaling molecules (semiochemicals) for defense and communication.

Purpose of the Study:

  • To define Volatile organic compounds (VOCs).
  • To explore the significance of VOCs in biological systems.
  • To specifically address VOC production by fungi.

Main Methods:

  • Literature review of VOC properties and functions.
  • Analysis of VOC roles in inter-organismal interactions.
  • Focus on fungal metabolic pathways for VOC generation.

Main Results:

  • VOCs encompass diverse chemical classes like alcohols, aldehydes, and terpenes.
  • Fungi produce a variety of VOCs that can influence their environment.
  • VOCs serve critical ecological functions, including defense and signaling.

Conclusions:

  • Understanding VOCs is crucial for comprehending biological interactions.
  • Fungal VOC production represents a significant area of ecological and biochemical study.
  • Further research into fungal VOCs can reveal novel biological insights.