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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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Related Experiment Video

Updated: Jun 18, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

An unusually fast-evolving supernova.

Dovi Poznanski1, Ryan Chornock, Peter E Nugent

  • 1Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA. dovi@berkeley.edu

Science (New York, N.Y.)
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

SN 2002bj is a unique supernova (SN) with rapid light curve changes and unusual elemental composition. This discovery suggests a new class of white dwarf progenitors, potentially involving helium detonation.

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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Last Updated: Jun 18, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
08:03

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Area of Science:

  • Astronomy and Astrophysics
  • Supernovae Research

Background:

  • Supernovae (SNe) are typically classified by their progenitors: exploding white dwarfs or collapsing massive stars.
  • SN 2002bj exhibits characteristics distinct from previously reported supernovae.

Purpose of the Study:

  • To analyze the unique properties of SN 2002bj.
  • To investigate its potential progenitor and classification.

Main Methods:

  • Photometric analysis of the light curve, noting rapid rise and decline.
  • Spectroscopic analysis to identify elemental composition.
  • Comparison with known supernova types.

Main Results:

  • SN 2002bj displayed a rapid light curve and a peak intrinsic brightness greater than -18 magnitude.
  • Spectra revealed helium and intermediate-mass elements, but lacked clear hydrogen or iron-peak elements.
  • The spectrum showed limited resemblance to Type Ia supernovae, with additional carbon and helium.

Conclusions:

  • SN 2002bj's properties suggest a hypothesized progenitor class: a helium detonation on a white dwarf with a small ejected envelope.
  • Future surveys are expected to identify more objects of this rare class.