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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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In pharmacotherapy, monitoring drug concentrations is paramount, especially for drugs whose therapeutic effects hinge on both the active compound and its metabolite. Hepatic impairment profoundly influences drug potency by altering liver function. If the drug is more potent than its metabolite, impaired liver function amplifies drug activity due to elevated drug concentration levels. Conversely, if the metabolite holds greater potency, diminished liver function diminishes drug activity by...
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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Vapor Pressure02:34

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Non-Volatile Metabolites from Trichoderma spp.

Meng-Fei Li1, Guo-Hong Li2, Ke-Qin Zhang3

  • 1State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, and Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming 650091, China. limengfei131420@163.com.

Metabolites
|March 27, 2019
PubMed
Summary

This review details secondary metabolites from Trichoderma fungi, summarizing 390 compounds from 20 species. These metabolites show diverse biological activities, highlighting Trichoderma

Keywords:
Trichodermabioactivitymetabolites

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Area of Science:

  • Mycology and Biochemistry
  • Fungal secondary metabolism and natural products

Background:

  • The genus *Trichoderma* comprises globally distributed fungi known for producing bioactive secondary metabolites.
  • These fungi have long been recognized for their potential as biocontrol agents.
  • Existing reviews often categorize *Trichoderma* metabolites by structure, activity, or origin.

Purpose of the Study:

  • To comprehensively review and summarize secondary metabolites produced by various *Trichoderma* species.
  • To provide an updated catalog of known and unidentified compounds, focusing on non-volatile metabolites.

Main Methods:

  • Literature review and compilation of data on *Trichoderma* secondary metabolites.
  • Systematic summarization of approximately 390 non-volatile compounds.
  • Organization of findings by specific *Trichoderma* species.

Main Results:

  • Identification and summary of secondary metabolites from 20 known *Trichoderma* species.
  • Inclusion of compounds from various unidentified *Trichoderma* species.
  • Detailed elaboration on approximately 390 distinct non-volatile compounds.

Conclusions:

  • This review consolidates current knowledge on *Trichoderma* secondary metabolites, offering a valuable resource.
  • The findings underscore the chemical diversity within the *Trichoderma* genus.
  • This compilation aids further research into the biological activities and applications of these fungal metabolites.