FACTOID # 17: Senior gentlemen might consider a trip to Russia, where there are two women over 65 for every man.
 
 Home   Encyclopedia   Statistics   Countries A-Z   Flags   Maps   Education   Forum   FAQ   About 
 
WHAT'S NEW
RECENT ARTICLES
More Recent Articles »
 

FACTS & STATISTICS    Simple view

  1. Select countries to view: (hold down Control key and click to select several)

     

     

    Compare:

     

     
  1. Select fact or statistic: (* = graphable)

     

     

     

  2. (OPTIONAL) Compare to statistic: (both need to be graphable)

     

     

     

  3. View result as:

     

       
(OR) SEARCH ALL encyclopedia, stats & forums:   

Encyclopedia > Double helix
A staircase in the shape of a double helix, in the Vatican Museum
A staircase in the shape of a double helix, in the Vatican Museum
Image of a DNA chain which shows the double helix replicating itself
Image of a DNA chain which shows the double helix replicating itself

In geometry a double helix (plural helices) typically consists of two congruent helices with the same axis, differing by a translation along the axis, which may or may not be half-way.[1] Download high resolution version (3039x2000, 623 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (3039x2000, 623 KB) Wikipedia does not have an article with this exact name. ... Stairs, staircase, stairway, flight of stairs are all names for a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. ... Categories: Stub | Vatican City ... DNA replication. ... DNA replication. ... For other uses, see Geometry (disambiguation). ... An example of congruence. ... A helix (pl: helices), from the Greek word έλικας/έλιξ, is a twisted shape like a spring, screw or a spiral (correctly termed helical) staircase. ... In physics, a translation is the operation changing the positions of all objects according to the formula where is a constant vector. ...


It was first published that the double helix is the structure of DNA by James D. Watson and Francis Crick in 1953, based on work by Rosalind Franklin.[2] The double helix shape is very strong. DNA takes this shape over a straight shape naturally for two reasons. It must be 'double' so it can reproduce itself and the helix, being intertwined, is stronger than two parallel chains because pulling it in any one direction won't break it apart. For other people named James Watson, see James Watson (disambiguation). ... Francis Harry Compton Crick OM FRS (8 June 1916 – 28 July 2004), (Ph. ... Rosalind Elsie Franklin (25 July 1920 Kensington, London – 16 April 1958 Chelsea, London) was an English biophysicist and X-ray crystallographer who made important contributions to the understanding of the fine structures of DNA, viruses, coal and graphite. ...


References

  1. ^ "Double Helix" by Sándor Kabai, The Wolfram Demonstrations Project, 2007.
  2. ^ Double Helix by George Kakaris, Biologist MSc in Applied Genetics and Biotechnology

See also

Look up nucleic acid in Wiktionary, the free dictionary. ... The Molecular structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid was an article published by James D. Watson and Francis Crick in the scientific journal Nature in its 171st volume on page 737-738 (dated April 25, 1953). ...


 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments
Please enter the 5-letter protection code

Want to know more?
Search encyclopedia, statistics and forums:
 


Lesson Plans | Student Area | Student FAQ | Reviews | Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.