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

The Fossil Record02:56

The Fossil Record

26.0K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
26.0K
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

4.2K
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
4.2K
Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

39.4K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
39.4K
Speciation Rates01:07

Speciation Rates

21.7K
Overview
21.7K
Setting Time of Cement01:12

Setting Time of Cement

312
The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
312
Minerals01:26

Minerals

502
Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
Major...
502

You might also read

Related Articles

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

Sort by
Same author

Absolute chronology of the Early Palaeolithic Karatau Culture in Central Asia.

Nature communications·2026
Same author

A continental-scale Eurasian ice sheet 2.4 million years ago.

Nature communications·2026
Same author

Astronomical calibration of the middle Cambrian in Baltica: global carbon cycle synchronization and climate dynamics.

Nature communications·2026
Same author

Mid-Devonian ocean oxygenation enabled the expansion of animals into deeper-water habitats.

Proceedings of the National Academy of Sciences of the United States of America·2025
Same author

A fossilized ventral ganglion reveals a chaetognath affinity for Cambrian nectocaridids.

Science advances·2025
Same author

Repeated occurrences of marine anoxia under high atmospheric O<sub>2</sub> and icehouse conditions.

Proceedings of the National Academy of Sciences of the United States of America·2025

Related Experiment Video

Updated: Sep 27, 2025

Author Spotlight: Alignment of Synchronized Time-Series Data Using the Characterizing Loss of Cell Cycle Synchrony Model for Cross-Experiment Comparisons
07:59

Author Spotlight: Alignment of Synchronized Time-Series Data Using the Characterizing Loss of Cell Cycle Synchrony Model for Cross-Experiment Comparisons

Published on: June 9, 2023

1.5K

Synchronizing rock clocks in the late Cambrian.

Zhengfu Zhao1, Nicolas R Thibault2, Tais W Dahl3

  • 1Department of Geosciences and Natural Resource Management, University of Copenhagen, DK-1350, Copenhagen, Denmark. zhzh@ign.ku.dk.

Nature Communications
|April 14, 2022
PubMed
Summary

Researchers developed a new 16-million-year astronomical time scale for the Cambrian period using geochemical data. This refined dating allows for a numerical assessment of major evolutionary events during this poorly understood era.

More Related Videos

Basic Caenorhabditis elegans Methods: Synchronization and Observation
11:34

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Published on: June 10, 2012

47.5K
Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

12.9K

Related Experiment Videos

Last Updated: Sep 27, 2025

Author Spotlight: Alignment of Synchronized Time-Series Data Using the Characterizing Loss of Cell Cycle Synchrony Model for Cross-Experiment Comparisons
07:59

Author Spotlight: Alignment of Synchronized Time-Series Data Using the Characterizing Loss of Cell Cycle Synchrony Model for Cross-Experiment Comparisons

Published on: June 9, 2023

1.5K
Basic Caenorhabditis elegans Methods: Synchronization and Observation
11:34

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Published on: June 10, 2012

47.5K
Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

12.9K

Area of Science:

  • Geochronology
  • Paleoclimatology
  • Paleontology

Background:

  • The Cambrian period (541 million years ago to 485.4 million years ago) remains poorly dated, hindering the study of its significant environmental and biological transformations.
  • Astronomically forced climate cycles in sediments offer a robust geochronometer, successfully refining Mesozoic-Cenozoic time scales but not yet the Paleozoic.
  • Previous geochronological methods have not adequately resolved the temporal dynamics of the late Cambrian.

Purpose of the Study:

  • To establish a high-resolution, numerically anchored astronomical time scale for the late Cambrian period.
  • To enable precise dating and correlation of major biotic and abiotic events within the late Cambrian.
  • To provide a numerical framework for assessing the tempo and pattern of evolutionary changes during this critical interval.

Main Methods:

  • Detection of a continuous astronomical signal through high-resolution (1 mm) geochemical variations in the late Cambrian Alum Shale Formation.
  • Anchoring the astronomical signal to radioisotopic dates to establish a robust geochronometer.
  • Integration with biostratigraphic data to correlate the new time scale with global stage boundaries.

Main Results:

  • A 16-million-year-long astronomical time scale for the late Cambrian has been established.
  • The time scale is biostratigraphically well-constrained, enabling precise correlation with the 405-kiloyear astrochronological framework.
  • This framework allows for the first numerical assessment of the timing and duration of key events like the end-Marjuman extinctions and the Steptoean Positive Carbon Isotope Excursion.

Conclusions:

  • Astronomical time-scaling provides a powerful new tool for refining Paleozoic geochronology.
  • The established late Cambrian time scale offers unprecedented numerical resolution for studying evolutionary dynamics.
  • This research facilitates a deeper understanding of the interplay between environmental change and biological evolution during the Cambrian.