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Topic: DNA

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In the News (Wed 17 Apr 19)

  The President's DNA Initiative
The President's DNA Initiative provides funding, training, and assistance to ensure that forensic DNA reaches its full potential to solve crimes, protect the innocent, and identify missing persons.
Case Studies on the Uses of Forensic DNA
DNA tracks Paulette Bryson's killer to his grave
www.dna.gov   (93 words)

  DNA Forensics
Her estranged husband was implicated because a snowy white cat hair was found in a jacket near the scene of the crime, and DNA fragments from the hair matched DNA fragments from Snowball, the cat belonging to the husband's parents.
The first case in which a murderer was convicted on DNA evidence obtained from a plant was described in the PBS TV series, "Scientific American Frontiers." A young woman was murdered in Phoenix, Arizona, and a pager found at the scene of the crime led the police to a prime suspect.
DNA can provide insights into many intimate aspects of a person and their families including susceptibility to particular diseases, legitimacy of birth, and perhaps predispositions to certain behaviors and sexual orientation.
www.ornl.gov /sci/techresources/Human_Genome/elsi/forensics.shtml   (3376 words)

  DNA - Wikipedia, the free encyclopedia
DNA is a long polymer of nucleotides (a polynucleotide) and encodes the sequence of the amino acid residues in proteins using the genetic code, a triplet code of nucleotides.
DNA is often referred to as the molecule of heredity as it is responsible for the genetic propagation of most inherited traits.
DNA profiling was developed in 1984 by English geneticist Sir Alec Jeffreys of the University of Leicester, and was first used to convict Colin Pitchfork in 1988 in the Enderby murders case in Leicestershire, England.
en.wikipedia.org /wiki/DNA   (6754 words)

 DNA and Chromosomes
James Watson, the shape of DNA is a double helix.
Within the ladder model of DNA (at left), the sugar and phosphate strands compose the sides of the DNA model, or molecule, while the actual rungs of the ladder are made up of the 4 nitrogen bases.
For a molecule of DNA to maintain its shape there are a number of rules between pair bonds, and the strands of phosphates.
www.mnsu.edu /emuseum/biology/evolution/genetics/dna.html   (427 words)

 BERC Publications: A few words about DNA and chromatin   (Site not responding. Last check: )
The diameter of the DNA helix is 2 nm and the vertical rise per base pair is 0.34 nm [Ho89].
The structure of the DNA helix is stabilized by van der Waals forces, hydrogen bonds between complementary organic bases (a base pair), and hydrophobic interactions between the nitrogenous bases and the surrounding sheath of water.
DNA is bound to the histones through electrostatic forces between the negatively charged phosphate groups in the DNA backbone and positively charged amino acids (e.g., lysine and arginine) in the histone proteins.
www.pnl.gov /berc/bg/dna.html   (1960 words)

 Introduction to DNA Structure   (Site not responding. Last check: )
The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group.
A nucleoside is one of the four DNA bases covalently attached to the C1' position of a sugar.
The DNA backbone is a polymer with an alternating sugar-phosphate sequence.
www.blc.arizona.edu /Molecular_Graphics/DNA_Structure/DNA_Tutorial.HTML   (591 words)

 Build a DNA Molecule
The structure of DNA is a double helix, much like a ladder that is twisted into a spiral shape.
The uprights of the ladder are the structural backbone of the DNA.
DNA bases characteristically pair G with C, and A with T. Use these pairing rules and the nucleotides below to build a DNA strand containing five base pairs.
gslc.genetics.utah.edu /units/basics/builddna   (176 words)

If an entire molecule of DNA from the virus "bacteriophage lambda" were shown at this scale, the image would be 970 meters high.
And for a typical piece of DNA from a eukaryote cell, the image would stretch for 1600 kilometers, about as far as it is from Dallas to Washington, D. Obviously such a large molecule is not fully stretched out inside the cell, but is wound around proteins called histones which protect the DNA.
This model of DNA appears courtesy of the Image Library of Biological Macromolecules based in Jena, Germany, which maintains a large archive of spectacular computer graphics of DNA, RNA, and proteins.
www.ucmp.berkeley.edu /glossary/gloss3/dna.html   (354 words)

It was known at the time that DNA was present in the nucleus of every living cell, and that it had something to do with heridity, but without a knowledge of its structure little more could be understood about how it actually worked.
DNA molecules can duplicate themselves, in a process called replication, in which the 2 halves of the helix separate and a new partner is fabricated to exactly match each half.
DNA can be extracted from organic remains (blood, saliva, etc) left at crime scenes to identify the criminal.
www.chm.bris.ac.uk /motm/dna/dna.htm   (880 words)

 DNA Structure and Function
When their experiment was published and people finally acknowledged that DNA was the genetic material, there was a lot of competition to be the first to discover its chemical structure.
Someone else showed them Franklin’s photographs of DNA x-ray crystallography, and from her pictures, they were able to determine that the structure of DNA was organized into a double spiral or double helix.
First, the DNA code is transcribed to RNA code, which is still in the “language” of nitrogenous bases, except that adenine on the DNA pairs with uracil (in place of thymine) on the RNA.
biology.clc.uc.edu /courses/bio104/dna.htm   (3292 words)

The DNA molecule, the program for all life, is based on the golden section.
DNA in the cell appears as a double-stranded helix referred to as B-DNA.
This form of DNA has a two groove in its spirals, with a ratio of phi in the proportion of the major groove to the minor groove, or roughly 21 angstroms to 13 angstroms.
goldennumber.net /dna.htm   (243 words)

 LiveScience.com - Beyond Biology: Making Factories and Computers with DNA
DNA in nature is often just one long continuous chain, but researchers would prefer to have other shapes at their disposal.
By reversing the turning direction, the palindromic DNA grew back in length, implying that it could be used to convert rotation into translation in a mechanical nanodevice, the authors speculate.
Placing several copies of their molecule in solution, the researchers could snap the tweezers shut by mixing in another DNA molecule, called a "set strand," that bonds specifically to the two ends of the "V" and pulls it closed.
www.livescience.com /technology/060620_dna_nanotech.html   (1435 words)

 DNA 101
DNA 101 is an attempt to take the extremely complex and confusing subject of Genetics and DNA and simplify it into layman terms.
DNA testing can be a valuable tool in genealogical research when it is combined with conventional research.
Because DNA segments that lie near each other on a chromosome tend to be inherited together, markers are often used as indirect ways of tracking the inheritance pattern of genes that have not yet been identified, but whose approximate locations are known.
blairgenealogy.com /dna/dna101.html   (2602 words)

 Dna Supply Chain Investments Limited Information | Business.com
Home » Directory » Retail & Consumer Services » Apparel & Accessories » Shoes » Women » Dna Supply Chain Investments Limited
The Group's principal activity is in the business of local and international supply chain management through the provision of integrated supply chain solutions.
Other business products and services to help grow and manage your business
rd.business.com /index.asp?epm=s.1&bdcq=DNA&bdcr=1&bdcu=http://www.business.com/directory/retail_and_consumer_services/apparel_and_accessories/shoes/women/dna_supply_chain_investments_limited/index.asp?partner=2662601&bdcp=&partner=2662601&bdcs=nwuuid-2662601-2368C18C-1099-B783-C277-DEB58AC79C5C-ym   (0 words)

 DNA - an introduction and overview
The DNA is organized into stretches of genes, stretches where proteins attach to coil the DNA into chromosomes, stretches that "turn a gene on" and "turn a gene off", and large stretches whose purpose is not yet known to scientists.
In these ways, DNA controls how many fingers you have, where your legs are placed on your body, and the color of your eyes.
All of the DNA in a cell is found in individual pieces, called chromosomes.
www.eurekascience.com /ICanDoThat/dna_intro.htm   (613 words)

 DNA and Molecular Genetics
DNA had been proven as the genetic material by the Hershey-Chase experiments, but how DNA served as genes was not yet certain.
The data known at the time was that DNA was a long molecule, proteins were helically coiled (as determined by the work of Linus Pauling), Chargaff's base data, and the x-ray diffraction data of Franklin and Wilkens.
DNA is a double helix, with bases to the center (like rungs on a ladder) and sugar-phosphate units along the sides of the helix (like the sides of a twisted ladder).
www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookDNAMOLGEN.html   (1834 words)

 CBC News Indepth: Crime
Local DNA data banks are connected to national DNA data banks, which could be connected to international databanks with information on millions of felons.
The DNA sample had been collected at rape scenes in Scarborough, evidence in the hunt for the so-called "Scarborough rapist," which turned out to be Bernardo.
DNA testing used to be a slow, expensive process, taking months and costing tens of thousands of dollars.
www.cbc.ca /news/background/crime/dna.html   (1129 words)

 C&EN: Latest News - DNA Nanotubes
Layers of DNA in the nanotubes are held together by hybridization of a series of DNA strands.
The DNA nanotubes are constructed in the 100-nm-diameter pores of alumina membranes.
The new DNA nanotubes could make it possible to transfer DNA without separate carriers, but this would necessitate "that these tubes are able to cross the cell membrane and reach the nucleus," which has yet to be demonstrated, Bianco notes.
pubs.acs.org /cen/news/83/i23/8323notw8.html   (454 words)

 Pharmaceutical DNA glossary
DNA, which consists of a polysugar- phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).
DNA transposable elements include bacterial IS (insertion sequence) elements, Tn elements, the maize controlling elements Ac and Ds, Drosophila P, gypsy, and pogo elements, the human Tigger elements and the Tc and mariner elements which are found throughout the animal kingdom.
A segment of DNA that is transcribed, but removed from within the transcript by splicing together the sequences (exons) on either side of it.
www.genomicglossaries.com /content/DNA.asp   (2859 words)

Junk DNA is "no junk!" But instead part of the heritage that will one day led you back to the wholeness of your identity.
The process of assembling DNA strands by working with the higher chakras is the process of bringing frequency form the Stellar Spirals into the Star Crystal Seals.
DNA Template and Kundalini Activation do not occur via “wishful thinking” or “hopeful intention”, they are processes of natural Bio-Spiritual CREATION PHYSICS, which occur via educated, conscious direction of energy and genuine Spiritual Wisdom.
www.keylonticdictionary.org /Words/D/DNA.htm   (1185 words)

 Dr Chromo's school: DNA structure
The OH (hydroxyl) group on the 5' carbon is replaced by a bond to the phosphate group (ester bond).
DNA consists of two associated polynucleotide strands that wind together in a helical fashion.
On the right, is shown the double helix of DNA which is the normal state of the molecule.
www.rothamsted.bbsrc.ac.uk /notebook/courses/guide/dnast.htm   (630 words)

 DNA   (Site not responding. Last check: )
Deoxyribonucleic Acid (DNA) is found mainly in the nucleus of the cell, while Ribonucleic Acid (RNA) is found mainly in the cytoplasm of the cell although it is usually synthesized in the nucleus.
DNA contains the genetic codes to make RNA and the RNA in turn then contains the codes for the primary sequence of amino acids to make proteins.
The best way to understand the structures of DNA and RNA is to identify and examine individual parts of the structures first.
www.elmhurst.edu /~chm/vchembook/580DNA.html   (530 words)

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