Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Shock Waves01:16

Shock Waves

2.2K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
2.2K
Subliminal Perception01:15

Subliminal Perception

418
Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
418
Buoyancy00:59

Buoyancy

11.1K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
11.1K
Spontaneity02:21

Spontaneity

25.6K
A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to...
25.6K
Unusual Results01:16

Unusual Results

3.4K
Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value =...
3.4K
Hydraulic Jump01:29

Hydraulic Jump

248
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
248

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Author Correction: The 'photosynthetic C1 pathway' links carbon assimilation and growth in California poplar.

Communications biology·2026
Same author

Beyond climate: the emerging physiological roles of methane and nitrous oxide.

Medical gas research·2026
Same author

Methylotrophic yeast <i>Candida boidinii</i> enhances the colonization of plant growth-promoting yeast <i>Papiliotrema laurentii</i> in the phyllosphere.

Frontiers in microbiology·2025
Same author

Dual Isotope Analysis Reveals Phylogenetic Patterns and Novel Insights Into Methoxy Group Synthesis of Structural Biomolecules in Leaf and Woody Plant Tissues.

Plant, cell & environment·2025
Same author

Site-specific hydrogen isotope measurements of vanillin by <sup>2</sup>H-qNMR and GC-IRMS.

Analytical and bioanalytical chemistry·2025
Same author

The 'photosynthetic C<sub>1</sub> pathway' links carbon assimilation and growth in California poplar.

Communications biology·2024

Related Experiment Video

Updated: Oct 13, 2025

Exploring Deep Space - Uncovering the Anatomy of Periventricular Structures to Reveal the Lateral Ventricles of the Human Brain
17:13

Exploring Deep Space - Uncovering the Anatomy of Periventricular Structures to Reveal the Lateral Ventricles of the Human Brain

Published on: October 22, 2017

17.0K

A surprise from the deep.

Frank Keppler1,2

  • 1Biogeochemistry Group, Institute of Earth Sciences, Heidelberg University, Heidelberg, Germany.

Science (New York, N.Y.)
|November 11, 2021
PubMed
Summary

Isotope patterns in methoxyl groups can identify the source and production potential of methane originating from coal deposits. This analysis aids in understanding coalbed methane resources.

Area of Science:

  • Geochemistry
  • Organic geochemistry
  • Isotope geochemistry

Background:

  • Coalbed methane is a significant energy resource.
  • Understanding methane origin is crucial for resource assessment and management.
  • Methoxyl groups are common functional groups in coal macerals.

Purpose of the Study:

  • To investigate the utility of methoxyl group isotope patterns for determining methane origin from coal.
  • To assess the potential of coal for methane production based on these isotopic signatures.

Main Methods:

  • Analysis of stable isotope ratios (e.g., 13C/12C, 2H/1H) in methoxyl groups of coal samples.
  • Characterization of methane composition and isotopic signatures associated with different coal types.
  • Correlation of isotopic data with coal properties and methane generation potential.

More Related Videos

Shallow Water Paddling Variants of Water Maze Tests in Mice
07:47

Shallow Water Paddling Variants of Water Maze Tests in Mice

Published on: June 3, 2013

23.8K
Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
11:56

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response

Published on: November 12, 2014

12.5K

Related Experiment Videos

Last Updated: Oct 13, 2025

Exploring Deep Space - Uncovering the Anatomy of Periventricular Structures to Reveal the Lateral Ventricles of the Human Brain
17:13

Exploring Deep Space - Uncovering the Anatomy of Periventricular Structures to Reveal the Lateral Ventricles of the Human Brain

Published on: October 22, 2017

17.0K
Shallow Water Paddling Variants of Water Maze Tests in Mice
07:47

Shallow Water Paddling Variants of Water Maze Tests in Mice

Published on: June 3, 2013

23.8K
Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
11:56

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response

Published on: November 12, 2014

12.5K

Main Results:

  • Distinct isotopic patterns were observed in methoxyl groups, correlating with methane origin (biogenic vs. thermogenic).
  • Isotope analysis of methoxyl groups effectively differentiated methane sources in coal.
  • The study established a link between methoxyl group isotopes and coal's methane production capacity.

Conclusions:

  • Isotope analysis of methoxyl groups provides a novel and effective method for tracing methane origin in coal.
  • This approach can enhance the evaluation of coalbed methane exploration and production potential.
  • Understanding methane genesis through functional group analysis offers new insights into coalbed methane systems.