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

Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
The Chain Rule01:30

The Chain Rule

A system of interconnected gears provides a concrete physical interpretation of the Chain Rule in calculus. Consider three gears arranged in sequence, where the rotational speeds of the first, second, and third gears are represented by the variables x, z, and y, respectively. The first gear drives the second, and the second drives the third, so the motion of each gear depends on the one preceding it. This structure naturally leads to a two-stage variable relationship that can be analyzed using...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...

You might also read

Related Articles

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

Sort by
Same author

Meta-analysis of on-the-road experimental studies of hypnotics: effects of time after intake, dose, and half-life.

Traffic injury prevention·2014
Same author

Beyond sleep duration: distinct sleep dimensions are associated with obesity in children and adolescents.

International journal of obesity (2005)·2013
Same author

ICA methods for MEG imaging.

Neurology & clinical neurophysiology : NCN·2005
Same author

Effects of rapid versus slow accumulation of eight hours of sleep loss.

Psychophysiology·2002
Same author

Effects of an experimentally induced rhinovirus cold on sleep, performance, and daytime alertness.

Physiology & behavior·2001
Same author

Scoring reliability of the multiple sleep latency test in a clinical population.

Sleep·2000
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
See all related articles

Related Experiment Video

Updated: Jun 14, 2026

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
09:13

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

Published on: May 12, 2023

The cretaceous-tertiary transition.

C B Officer, C L Drake

    Science (New York, N.Y.)
    |March 25, 1983
    PubMed
    Summary
    This summary is machine-generated.

    The Cretaceous-Tertiary boundary

    More Related Videos

    Analysis of Transgenerational Epigenetic Inheritance in C. elegans Using a Fluorescent Reporter and Chromatin Immunoprecipitation (ChIP)
    10:28

    Analysis of Transgenerational Epigenetic Inheritance in C. elegans Using a Fluorescent Reporter and Chromatin Immunoprecipitation (ChIP)

    Published on: May 5, 2023

    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation
    05:15

    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation

    Published on: December 27, 2024

    Related Experiment Videos

    Last Updated: Jun 14, 2026

    Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
    09:13

    Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

    Published on: May 12, 2023

    Analysis of Transgenerational Epigenetic Inheritance in C. elegans Using a Fluorescent Reporter and Chromatin Immunoprecipitation (ChIP)
    10:28

    Analysis of Transgenerational Epigenetic Inheritance in C. elegans Using a Fluorescent Reporter and Chromatin Immunoprecipitation (ChIP)

    Published on: May 5, 2023

    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation
    05:15

    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation

    Published on: December 27, 2024

    Area of Science:

    • Paleontology
    • Geology
    • Geochemistry

    Background:

    • The Cretaceous-Tertiary (K-T) boundary marks a significant transition in Earth's history, characterized by major faunal changes and an iridium anomaly.
    • Previous interpretations suggested an extraterrestrial impact event as the primary cause for these K-T boundary phenomena.
    • Variations in fossil records and geochemical data present complexities in understanding the K-T transition.

    Purpose of the Study:

    • To critically evaluate the extraterrestrial impact hypothesis for the K-T boundary faunal changes and iridium anomaly.
    • To explore alternative explanations for the observed geological and paleontological records at the K-T transition.
    • To synthesize diverse data, including fossil evidence, iridium distribution, and clay mineralogy, to reassess the K-T boundary event.

    Main Methods:

    • Analysis of fossil sequences from core samples across the K-T boundary.
    • Examination of iridium distribution patterns and noble metal abundances at various sites.
    • Assessment of clay mineralogy and depositional effects in boundary layer clays.

    Main Results:

    • Observed significant variations in fossil transition times and intervals depending on location and fossil indicators.
    • Identified inconsistencies in iridium distribution, total amounts, and normalized noble metal abundances across different sites.
    • Highlighted potential depositional effects in reducing environments and distinct clay mineralogy at the boundary layer.

    Conclusions:

    • The extraterrestrial impact hypothesis is questioned due to variations in fossil and geochemical data.
    • Terrestrial events, such as extensive volcanism, sea-level regression, and paleoclimatic shifts, offer more plausible explanations for K-T boundary changes.
    • Continued research into diverse terrestrial phenomena is crucial for a comprehensive understanding of the Cretaceous-Tertiary transition.