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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Photoreceptors and Plant Responses to Light

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Flame Photometry: Overview01:02

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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: Lab

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...
Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

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Related Experiment Video

Updated: Jun 13, 2026

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
09:04

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

Reflectance of a vegetation canopy using the Adding method.

K Cooper1, J A Smith, D Pitts

  • 1Colorado State University, College of Forestry Natural Resources, Fort Collins, Colorado 80523, USA.

Applied Optics
|April 20, 2010
PubMed
Summary
This summary is machine-generated.

The Adding method accurately calculates vegetation canopy bidirectional reflectance using reflection and transmission matrices. This approach is validated against field measurements for blue grama and soybeans.

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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

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Related Experiment Videos

Last Updated: Jun 13, 2026

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
09:04

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy
06:28

Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy

Published on: July 29, 2021

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
10:20

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

Published on: August 9, 2019

Area of Science:

  • Plant ecophysiology
  • Remote sensing
  • Biophysical modeling

Background:

  • Bidirectional reflectance is crucial for understanding vegetation canopies.
  • Existing models may not fully capture canopy geometry and optical properties.

Purpose of the Study:

  • To present and validate the Adding method for calculating vegetation canopy bidirectional reflectance.
  • To develop reflection and transmission matrices based on canopy geometry and optical properties.

Main Methods:

  • The Adding method was employed to model vegetation canopy reflectance.
  • Reflection and transmission matrices were formulated for canopy and soil layers.
  • Model performance was assessed using field reflectance data for blue grama and soybeans.
  • Comparisons were made with the Suits model.

Main Results:

  • The Adding method demonstrated effective calculation of bidirectional reflectance.
  • The model accurately represented field measurements for blue grama and soybeans.
  • The developed matrices successfully incorporated canopy geometry and optical properties.

Conclusions:

  • The Adding method provides a robust approach for estimating vegetation canopy bidirectional reflectance.
  • The model's accuracy is supported by field validation and comparison with established models.