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Related Concept Videos

Flame Photometry: Overview01:02

Flame Photometry: Overview

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Flame Photometry: Lab01:16

Flame Photometry: Lab

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The...
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Light Acquisition02:16

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Mass Photometry.

Roi Asor1,2, Dan Loewenthal1,2, Raman van Wee1,2,3

  • 1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, United Kingdom;

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|May 6, 2025
PubMed
Summary
This summary is machine-generated.

Mass photometry (MP) is a powerful tool for measuring biomolecule mass in solution. This label-free technology quantifies molecular species and their interactions, driving its adoption in life sciences research.

Keywords:
biomolecular mechanismsmacromolecular complexesmass photometrymembrane-associated dynamicsprotein–protein interactionssingle molecule

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Area of Science:

  • Biophysics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Mass photometry (MP) offers precise, label-free mass measurement of biomolecules in solution.
  • It enables quantitative analysis of distinct species and their relative abundances within mixtures.
  • MP's capabilities extend to polypeptides, nucleic acids, lipids, and sugars.

Purpose of the Study:

  • To provide an overview of the origins and development of mass photometry.
  • To highlight current applications of MP in the life sciences.
  • To discuss future improvements and expanded scope for MP technology.

Main Methods:

  • Utilizes label-free optical detection for quantitative mass measurement.
  • Applies principles of photometry to determine molecular mass in solution.
  • Enables characterization of molecular heterogeneity, interaction energies, and kinetics.

Main Results:

  • MP has transformed label-free detection into a quantitative measurement technique.
  • It allows for the identification and quantification of different molecular species in complex mixtures.
  • MP facilitates the study of biomolecular complexes, their composition, and temporal changes.

Conclusions:

  • Mass photometry is a versatile and rapidly adopted technology in life sciences.
  • Its quantitative nature and broad applicability offer significant advantages over traditional methods.
  • Future advancements will further broaden the scope and impact of MP in biological research.