Double helix - Factbites

Double helix - Factbites
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Topic: Double helix

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	Double helix - Wikipedia, the free encyclopedia
		The double helix is the structure of DNA as first published by James D. Watson and Francis Crick in 1953.
		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.
		Each strand forms a helix, and the two helices are held together through hydrogen bonds, ionic forces, hydrophobic interactions, and van der Waals forces forming a double helix.
	en.wikipedia.org /wiki/Double_helix (215 words)

	The Double Helix
		The molecule was, they said, in the form of a double helix - two helices that spiral around each other, connected by molecular bonds, to resemble nothing more than a rope ladder that has been repeatedly twisted along its length.
		Well, if what you are looking for is a mathematical explanation of why nature chose a double helix for DNA, the answer is: on the sidelines.
		The reason the helix is so useful is that it is the shape you get when you trace out a circle at the same time as you move at a constant rate in the direction perpendicular to the plane of the circle.
	www.maa.org /devlin/devlin_04_03.html (870 words)

	The Double Helix
		There is an average of 25 hydrogen bonds within each complete turn of the double helix providing a stability of binding about as strong as what a covalent bond would provide.
		The double helix makes a complete turn in just over 10 nucleotide pairs, so each turn takes a little more (35.7 Å to be exact) than the 34 Å shown in the diagram.
		The double helix of DNA has these features:
	users.rcn.com /jkimball.ma.ultranet/BiologyPages/D/DoubleHelix.html (284 words)

	DNA Double Helix
		The double helix in DNA consists of two right-handed polynucleotide chains that are coiled about the same axis.
		Describe the structure of the double helix of DNA in your own words including the terms: backbone, heterocyclic amines, complementary base pairings, hydrogen bonding, deoxyribose, phosphate.
		Using Chargaff's information and the X-ray data in conjunction with building actual molecular models, Watson and Crick developed the double helix as a model for DNA.
	www.elmhurst.edu /~chm/vchembook/582dnadoublehelix.html (617 words)

	Freeze branding cattle and the Double Helix brand
		The brand of the Double Helix Ranch is a stylized rendition of the DNA molecule: the molecule that encodes all genetic traits in all living organisms.
		The two strands of the double helix of DNA are formed from long chains of four nucleotides: adenine, guanine, cytosine, and thymine.
		By sequencing the long strings of nucleotides that form each strand of DNA's double helix, biologists are learning to read the genetic instructions that specify what an organism looks like and how it functions.
	home.austin.rr.com /doublehelix/Brandexplanation.html (1200 words)

	Station 2.2 - Double Helix Model
		DNA double helix is the key to the mystery of lifeIt holds the instructions for how we live and breathe, all written out in a four letter code.
		The DNA double helix is made up of genes which are sort of a recipe for who you are.
		The neat thing about the DNA double helix is that it can make a copy of itself.
	genome.pfizer.com /station2-2.cfm (487 words)

	DNA Molecule - Two Views
		The double helix of the DNA is shown along with details of how the bases, sugars and phosphates connect to form the structure of the molecule.
		DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase).
		Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases.
	www.accessexcellence.org /AB/GG/dna_molecule.html (94 words)

	The Double Helix
		As the double helix is split apart, nucleotides (Fig.3) are brought in to build two complementary strands (III and IV) against the template of the original two strands (I and II) Fig.
		The original double helix strands (I and II) are now replicated in the form of two new DNA helices (III and IV).
		The elucidation of the mechanisms which control heredity was reduced to basic atomic and molecular processes with the discovery of DNA, the double helix, RNA, etc. The new discipline of molecular biology has laid bare the complexities of living structures with a depth and clarity unthinkable fifty years ago.
	www.truertru.com /articles/helix.htm (6149 words)

	Amazon.com: The Double Helix: A Personal Account of the Discovery of the Structure of DNA: Books: James D. Watson
		The Double Helix: A Personal Account of the Discovery of the Structure of DNA written by James D. Watson is a rather engaging with a easily readable down to earth style book on the discovery of the structure of DNA.
		The Double Helix is a startling window into the scientific method, full of insight and wit, and packed with the kind of science anecdotes that are told and retold in the halls of universities and laboratories everywhere.
		For all the significance of the discovery it chronicles, The Double Helix never bothers to explain how, for example, x-ray crystallography actually works, or what the difference between a keto- and an -enol is, or even why Watson's and Crick's discovery brought on a new era in the life sciences.
	www.amazon.com /exec/obidos/tg/detail/-/0451627873?v=glance (2478 words)

	SPACE.com -- Cosmic 'DNA': Double Helix Spotted in Space
		The Double Helix Nebula is the reddish inset; the larger-field greenish image is a shorter-wavelength infrared image made recently with the IRAC camera on the Spitzer Space Telescope.
		The double helix shape is commonly seen inside living organisms, but this is the first time it has been observed in the cosmos.
		Scientists think that twisting of these lines is what causes the double helix shape.
	www.space.com /scienceastronomy/060315_dna_nebula.html (665 words)

	Introduction to DNA Structure
		Within the DNA double helix, A forms 2 hydrogen bonds with T on the opposite strand, and G forms 3 hyrdorgen bonds with C on the opposite strand.
		Example of dA-dT base pair as found within DNA double helix
		Example of dG-dC base pair as found within DNA double helix
	www.blc.arizona.edu /Molecular_Graphics/DNA_Structure/DNA_Tutorial.HTML (591 words)

	Structure of DNA
		The structure of DNA is illustrated by a right handed double helix, with about 10 nucleotide pairs per helical turn.
		Illustration of the double helical structure of the DNA molecule.
		Each spiral strand, composed of a sugar phosphate backbone and attached bases, is connected to a complementary strand by hydrogen bonding (non- covalent) between paired bases, adenine (A) with thymine (T) and guanine (G) with cytosine (C).
	www.accessexcellence.org /AB/GG/structure.html (98 words)

	Halfbakery: Double Helix Escalators
		The remains of the double helix escalator originally installed in Holloway Road can be found in the London Transport Museum's depot at Acton.
		A great saving could be achieved were the escalators to be arranged in a double helix, one strand going up, the other down.
		Even if we can't have a double-helix escalator, we should have some double-helix stairs..
	www.halfbakery.com /idea/Double_20Helix_20Escalators (2502 words)

	fUSION Anomaly. Double Helix
		Watson and Crick built scale models of a double helix that would conform to the X-ray data and the known chemistry of DNA.
		There are also Portal days within the Tzolk'in that create a double helix pattern using 52 days and the mathematics of 28.
		DNA bathes in water, which in turn plays a crucial role in establishing the double helix's shape.
	fusionanomaly.net /doublehelix.html (1004 words)

	Great Mississippi River Race for Rett Syndrome, May 2001
		The Double Helix was paddled by Clark Eid (Amanda Eid's father, and chairman of this charity event) and Kurt Zimmermann during the race.
		The Double Helix is donated to the convention center by the friends and family of Amanda Eid (daughter of Mary Potter and Clark Eid) with thanks and gratitiude to all who participated and helped with this adventure.
		The Double Helix was built in honor of Amanda Eid and all of those who have Rett syndrome, to serve as a the flagship for the Great Mississippi River Race for Rett Syndrome, May 2001.
	www.dreamkeeper.org /flagship.htm (618 words)

	APOD: 2004 December 29 - The Helix Nebula from Blanco and Hubble
		Chile, however, have shown the Helix is not really a simple helix.
		APOD: 2004 December 29 - The Helix Nebula from Blanco and Hubble
		The shapes of planetary nebula like the Helix are important because they likely hold clues to how stars like the
	antwrp.gsfc.nasa.gov /apod/ap041229.html (119 words)

	"Double Helix" - Episode 105 - Gene Roddenberry's Andromeda
		Freya retrieves two metal pieces of jewelry, each shaped like a DNA Double Helix and places one on her arm and one on Tyr’s.
		"Double Helix" - Episode 105 - Gene Roddenberry's Andromeda
		Freya leads Tyr to her cave where they hear a voice-over of Rhade (Steve Bacic) telling Tyr that his DNA has evolved so that he may reproduce.
	www.andromedatv.com /episodes/season1/epi_105.html (919 words)

	Astronomers report unprecedented double helix nebula near the... 3/15/2006
		The double helix nebula is approximately 300 light years from the enormous black hole at the center of the Milky Way.
		The Spitzer Space Telescope, an infrared telescope, is imaging the sky at unprecedented sensitivity and resolution; Spitzer's sensitivity and spatial resolution were required to see the double helix nebula clearly.
		Astronomers report unprecedented double helix nebula near the...
	www.newsroom.ucla.edu /page.asp?RelNum=6903 (944 words)

	DNA structure
		The DNA double helix was identified by Watson and Crick in the late 1950's as being the most likely structure for DNA.
		Another feature of the double helix is that the strands are held together only by H-bonds and by hydrophobic interactions between the bases.
		Perhaps the most important feature of the double helix regarding its function is that all the information in it is redundant.
	www.biochem.uwo.ca /meds/medna/doublehelix.html (446 words)

	Blue's News: Activision and Raven Software's Soldier of Fortune II: Double Helix Has Gone Gold and Prepares for a Tour of Duty on Retail Shelves Nationwide
		Soldier of Fortune II: Double Helix also advances the genre with the introduction of a new random mission generator technology for both single and multiplayer.
		Soldier of Fortune II: Double Helix is rated M for MATURE (17 and above) for animated blood, violence and gore.
		To fully immerse players in the experience, Soldier of Fortune II: Double Helix brings the grittiness of combat to the PC like never before with incredibly detailed skeletal animations that enable lifelike character movements and per pixel hit locations for ultra realism.
	www.bluesnews.com /cgi-bin/articles.pl?show=356 (411 words)

	DNA - The Double Helix
		In 1953, James Watson and Francis Crick established the structure of DNA. The shape of DNA is a double helix (color the title black), which is like a twisted ladder.
		Color the nucleotides using the same colors as you colored them in the double helix.
		The DNA helix is actually made of repeating units called nucleotides.
	www.biologycorner.com /worksheets/DNAcoloring.html (767 words)

	Wired News: Happy Birthday, Dear Double Helix
		But she was apparently unable to interpret the images to the point of determining that DNA was a double helix.
		The letters formed rungs on the ladder of a spiraling double helix.
		Fifty years ago, a birdwatcher and a physicist discovered the secret to life: the double helix structure of DNA.
	www.wired.com /news/medtech/0,1286,57674,00.html (657 words)

	nature supplement: double helix - 50 years
		Given the immense significance of the double helix, it is difficult to imagine a world that wasn't transfixed by its discovery.
		As a prelude to the many celebrations around the world saluting the 50th anniversary of the discovery of the DNA double helix, Nature presents a collection of overviews that celebrate the historical, scientific and cultural impacts of a revelatory molecular structure.
		To help the reader fully appreciate how far the double helix has travelled, we also include the original landmark paper by Watson and Crick and the two accompanying papers by Maurice Wilkins, who shared the Nobel Prize with Watson and Crick in 1962, and by co-discoverer Rosalind Franklin, and their co-authors (pages 397–401).
	www.nature.com /nature/insights/6921.html (894 words)

	CSIRO's Double Helix Science Club
		Scientriffic magazine for ages 7+ is one of two magazines produced for members of CSIRO’s Double Helix Science Club. It is published every two months and is packed with science news, feature articles, hands-on experiments, comics, competitions and brain-bending puzzles.
		CSIRO's Double Helix Science Club members who get their questions published will also receive a special gift in the mail.
		Double Helix Science Club membership form (within Australia)
	www.csiro.au /csiro/channel/pcha0,,.html (350 words)

	Peripheral Records...Hiphop on the periphery
		Double Helix drops knowledge and soul in a mixture that's at once a throwback to an earlier era and a breath of fresh air for the current hip hop climate.
		Double Helix represents the very best that Florida and the Tampa Bay area has to offer in hip hop music.
		Taking their cues from groups like BDP, Tribe, Dilated and Gangstarr, Double Helix combines a flair for insightful engaging wordplay and raw beats and turntable cuts.
	www.peripheralrecords.com /peri_home.htm (595 words)

	RI Web Design - Double Helix Web Design and Internet Marketing -Newport, RI
		Double Helix specializes in providing the most critical aspects of a business web site presence together for our clients:
		RI Web Design - Double Helix Web Design and Internet Marketing -Newport, RI Strategic Web Design and Marketing Services - Newport, RI Since 2000, Double Helix has been designing and promoting web sites for clients all over New England from our offices in Newport, Rhode Island.
		Web Design - using cutting-edge technologies and also tried-and-true techniques, Double Helix builds web sites that are easy on the eyes, easy to navigate and are expandable as your needs change.
	www.helix2.com (180 words)

	Double helix: Facts and details from Encyclopedia Topic
		Double helix: Facts and details from Encyclopedia Topic
		[Click link for more facts about this topic] forming a double helix.
		A helix (pl: helices), from the greek word /, is a twisted shape like a spring, screw or a...
	www.absoluteastronomy.com /encyclopedia/d/do/double_helix.htm (618 words)

	Double Helix
		Under certain conditions DNA forms a right-handed anti-paralell helix in which the base pairs are considerably tilted with respect to the axis of the helix.
		The sugar-phosphate backbone is on the outside of the helix.
		A left-handed anti-paralell helix, called Z-DNA, can also form, particularly with alternating CpGp sequences.
	opbs.okstate.edu /~melcher/MG/MGW1/MG11221.html (342 words)

	Michigan Web Site Design & Professional Web Development from Double Helix, Inc. Web Solutions
		Double Helix can effectively use the internet to design, develop, and market your business giving you an edge above your competition.
		Some of the highlights of this project were a dynamic image gallery, a customizable events calendar, as well as a full featured content management system to customize the website with.
		More and more businesses are harnessing the power of the internet as a new market for business.
	www.dhelix.com (122 words)

	Levitated Double Helix Macromedia Flash open source
		A series of self similar fragment buttons arranged in a rotating double helix.
		Click on the fragments to expand and collapse individual rungs of the helix.
		Each rung is constructed using three separate objects, connected using string pointers.
	www.levitated.net /daily/levDoubleHelix.html (38 words)

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