Category Archives: DNA

4. Podas - Od dna do wiata
Jeli nie rozumiesz przekazu, posuchaj tyle razy a zrozumiesz. Miego suchania!

By: PodasXR

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4. Podas - Od dna do wiata - Video

No DNA Left Behind: "When inconclusive really means "informative"
Biological evidence is often a mixture of two or more people, which can pose DNA interpretation challenges. Human review of mixed or low-level data can lead ...

By: TrueAllele

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No DNA Left Behind: "When inconclusive really means "informative" - Video

MERICA DNA
DO NOT PANIC!!!!!!!!! =0)

By: jonh Platoon

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MERICA DNA - Video

One Direction Af Little Mix -DNA- Letra En Espaol
este es un videito que ise la verdad esta muy bueno lo traduci es hermoso es la letra.

By: lulu horan

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One Direction Af Little Mix -DNA- Letra En Espaol - Video

DNA MAD SCIENTISTS

By: GMSPLAINTABLES

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DNA MAD SCIENTISTS - Video

Calisthenics Motivation Chest Core Abs | Team Dna
No equipment or weights are used in calisthenics, and the exercises can be performed anywhere there is a floor and enough space to move in. Working out in th...

By: teamdnafitness

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Calisthenics Motivation Chest Core & Abs | Team Dna - Video

A former work colleague of mine has a little show in the Adelaide Fringe called DNA. It stars past and current Walford Students and will be held at the Channel 9 Studios between the 26th February and 2nd March 2014. Check out the Facebook Event for more details and get your tickets.

Facebook Page:https://www.facebook.com/pages/DNA/1386465324922407?fref=ts

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I work professionally in theatre, performing arts, and sports presentation. My areas of expertise are audio, vision and stage management. My favourite events are those involving music and dance. I have worked on the Rock Eisteddfod and Wakakirri Story Dance Festivals. Have worked on World Cup Qualifying matches for the Football (Soccer), Rugby (Tri Nations, Beldisloe Cup) and Hyundai A-League. I have also worked on the International Cricket in Adelaide (Test's and One Day Matches) as well as Adelaide Rugby Sevens. I prefer musical theatre over any other theatre genre and I also enjoy working on major sporting events.

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DNA | Techie

In This Issue:

What Is DNA?

Deoxyribonucleic acid (DNA) is a chemical found in the nucleus of cells and carries the "instructions" for the development and functioning of living organisms. It is often compared to a set of blueprints since it contains the instructions needed to build cells. These instructions are divided into segments along a strand of DNA and are called genes. Genes are a DNA sequence that code for the production of a protein and control hereditary characteristics such as eye color or personality behaviors. Proteins determine the type and function of a cell, so a cell knows whether it is a skin cell, a blood cell, a bone cell, etc, and how to perform its appropriate tasks. Other DNA sequences are responsible for structural purposes or are involved in the regulation and use of genetic information.

Structure of DNA

The structure of DNA can be compared to a ladder. It has an alternating chemical phosphate and sugar backbone, making the "sides" of the ladder. (Deoxyribose is the name of the sugar found in the backbone of DNA.) In between the two sides of this sugar-phosphate backbone are four nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G). (A grouping like this of a phosphate, a sugar, and a base makes up a subunit of DNA called a nucleotide.) These bases make up the "rungs" of the ladder, and are attached to the backbone where the deoxyribose (sugar) molecules are located.

The chemical bases are connected to each other by hydrogen bonds, but the bases can only connect to a specific base partner - adenine and thymine connect to each other and cytosine and guanine connect to each other. The arrangement of these bases is very important as this determines what the organism will be - a plant, an animal, or a fungus. This is called genetic coding. For example, one side of DNA could have the genetic code of AAATTTCCCGGGATC. Its complementary side would then have to be TTTAAAGGGCCCTAG.

Even though the shape of DNA is often described as a ladder, it is not a straight ladder. It is twisted to the right, making the shape of the DNA molecule a right-handed double helix. This shape allows for a large amount of genetic information to be "stuffed" into a very small space. In fact, if you lined up each molecule of DNA in one cell end to end, the strand would be six feet in length.

DNA Replicates Itself

Before a cell can divide and make a new cell, it must first duplicate its DNA. This process is called DNA replication. When it is time to replicate, the hydrogen bonds holding the base pairs together break, allowing the two DNA strands to unwind and separate. The specific base pairing provides a way for DNA to make exact copies of itself. Each half of the original DNA still has a base attached to its sugar-phosphate backbone. A new strand of DNA is made by an enzyme called DNA polymerase. It reads the original strand and matches complementary bases to the original strand. (The sugar-phosphate backbone comes with the new bases.) New strands attach to both sides of the original DNA, making two identical DNA double helices composed of one original and one new strand.

Please note that the above explanation of DNA replication is highly simplified. To see a more detailed, animated explanation of the structure of DNA and the replication process, click here.

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DNA: Fun facts - Home Science Tools

Like the one ring of power in Tolkien's "Lord of the Rings," deoxyribonucleic acid (DNA) is the master molecule of every cell. It contains vital information that gets passed on to each successive generation. It coordinates the making of itself as well as other molecules (proteins). If it is changed slightly, serious consequences may result. If it is destroyed beyond repair, the cell dies.

Changes in the DNA of cells in multicellular organisms produce variations in the characteristics of a species. Over long periods of time, natural selection acts on these variations to evolve or change the species.

The presence or absence of DNA evidence at a crime scene could mean the difference between a guilty verdict and an acquittal. DNA is so important that the United States government has spent enormous amounts of money to unravel the sequence of DNA in the human genome in hopes of understanding and finding cures for many genetic diseases. Finally, from the DNA of one cell, we can clone an animal, a plant or perhaps even a human being.

But what is DNA? Where is it found? What makes it so special? How does it work? In this article, we will look deep into the structure of DNA and explain how it makes itself and how it determines all of your traits. First, let's look at how DNA was discovered.

DNA is one of a class of molecules called nucleic acids. Nucleic acids were originally discovered in 1868 by Friedrich Meischer, a Swiss biologist, who isolated DNA from pus cells on bandages. Although Meischer suspected that nucleic acids might contain genetic information, he could not confirm it.

In 1943, Oswald Avery and colleagues at Rockefeller University showed that DNA taken from a bacterium, Streptococcus pneumonia, could make non-infectious bacteria become infectious. These results indicated that DNA was the information-containing molecule in the cell. The information role of DNA was further supported in 1952 when Alfred Hershey and Martha Chase demonstrated that to make new viruses, a bacteriophage virus injected DNA, not protein, into the host cell (see How Viruses Work for more information).

So scientists had theorized about the informational role of DNA for a long time, but nobody knew how this information was encoded and transmitted. Many scientists guessed that the structure of the molecule was important to this process. In 1953, James D. Watson and Francis Crick discovered the structure of DNA at Cambridge University. The story was described in James Watson's book "The Double Helix" and brought to the screen in the movie, "The Race for the Double Helix." Basically, Watson and Crick used molecular modeling techniques and data from other investigators (including Maurice Wilkins, Rosalind Franklin, Erwin Chargaff and Linus Pauling) to solve the structure of DNA. Watson, Crick and Wilkins received the Nobel Prize in Medicine for the discovery of DNA's structure (Franklin, who was Wilkins' collaborator and provided a key piece of data that revealed the structure to Watson and Crick, died before the prize was awarded).

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HowStuffWorks "How DNA Works"

STORY HIGHLIGHTS

(CNN) -- Two Brooklyn men who have spent the last 21 years in prison for three murders that DNA evidence suggests they did not commit were released Thursday on consent of the Brooklyn district attorney.

Anthony Yarbough, 39, and Sharrif Wilson, 37, were arrested in June 1992 in the slaying Yarbough's 40-year-old mother, his 12-year-old sister and another 12-year-old girl in a Coney Island housing project.

"In this case, my office examined newly discovered scientific evidence that was not available at the time of the trial," Brooklyn District Attorney Kenneth P. Thompson said in statement to CNN. "My obligation under the law is to determine whether this new information, had it been known and presented at trial, would have been more likely than not to cause the trial jury to return a different verdict."

In 2013, new DNA evidence from under Yarbough's mother's fingernails matched sperm from the 1999 unsolved rape and murder of Migdalia Ruiz of Brooklyn, according to an investigation by the Medical Examiner's office.

Anthony Yarbough, left, and Sharrif Wilson were released Thursday on consent of the Brooklyn district attorney after DNA evidence suggests they did not commit the crimes they were convicted for.

Yarbough and Wilson were already incarcerated when the 1999 rape and murder occurred, according to Adam Perlmutter, Wilson's attorney.

"Based on this new evidence, I believe a jury would have been more likely to return a different verdict," Thompson said.

Zachary Margulis-Ohuma, Yarbough's attorney, is glad justice has finally been served.

"Anybody looking at this evidence with an open mind would see that there is no chance in the world that Tony murdered his mother and these two little girls," Margulis-Ohuma said.

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DNA evidence frees 2 Brooklyn men convicted in 1992 triple murder