Category Archives: DNA

Sep. 6, 2013 Graphene is a sheet of carbon atoms arrayed in a honeycomb pattern, just a single atom thick. It could be a better semiconductor than silicon -- if we could fashion it into ribbons 20 to 50 atoms wide. Could DNA help?

DNA is the blueprint for life. Could it also become the template for making a new generation of computer chips based not on silicon, but on an experimental material known as graphene?

That's the theory behind a process that Stanford chemical engineering professor Zhenan Bao reveals in Nature Communications.

Bao and her co-authors, former post-doctoral fellows Anatoliy Sokolov and Fung Ling Yap, hope to solve a problem clouding the future of electronics: consumers expect silicon chips to continue getting smaller, faster and cheaper, but engineers fear that this virtuous cycle could grind to a halt.

Why has to do with how silicon chips work.

Everything starts with the notion of the semiconductor, a type of material that can be induced to either conduct or stop the flow of electricity. Silicon has long been the most popular semiconductor material used to make chips.

The basic working unit on a chip is the transistor. Transistors are tiny gates that switch electricity on or off, creating the zeroes and ones that run software.

To build more powerful chips, designers have done two things at the same time: they've shrunk transistors in size and also swung those gates open and shut faster and faster.

The net result of these actions has been to concentrate more electricity in a diminishing space. So far that has produced small, faster, cheaper chips. But at a certain point, heat and other forms of interference could disrupt the inner workings of silicon chips.

"We need a material that will let us build smaller transistors that operate faster using less power," Bao said.

Originally posted here:
Scientists use DNA to assemble a transistor from graphene

LEBANON, Ind. - A forensics expert says blood on the clothing of a former state trooper accused of killing his wife, son and daughter 13 years ago could not have gotten there when the trooper found the boy's body, as the trooper insists.

Sgt. Dean Marks told jurors Thursday that DNA analysis revealed that eight blood dots on David Camm's T-shirt belong to his 5-year-old daughter Jill, not his 7-year-old son Bradley. Camm's lawyers have maintained throughout Camm's two previous murder trials that the blood got onto his shirt when Camm attempted CPR on his son.

Camm has been convicted twice of killing his wife, Kimberly and their two children, whose bodies were found in the family's garage. But both convictions were overturned on appeal. Because of the heavy publicity surrounding the case in and around Georgetown, the southern Indiana suburb of Louisville where the family lived, Camm's third trial was about 125 miles north to Lebanon.

Marks told the jury he studied more than 140 photographs of the blood patterns and cutout sections from the shirt worn by Camm. Where the spatters of blood came from and how they got there are key to prosecutors' case.

"This is consistent with gunshot spatter," Marks testified.

Defense attorneys argue the initial blood tests were made by an inexperienced scientist who had never been trained in blood spatter analysis and never before worked at a crime scene. They also say police rushed to judgment and overlooked key evidence.

Jurors on Thursday also watched video of a two-hour interview in which Camm tells his state police colleagues that he had nothing to do with killing his family.

"What's going to happen, you guys are going to get so focused on me that the guy who did this is going to walk away," Camm said.

Under questioning by defense attorney Stacy Uliana, Detective Robert Neal acknowledged that police lied when they told Camm that investigators had found blood on his jacket and other pieces of evidence against him.

He said such lies are considered an acceptable strategy to "get at the truth" when interrogating a prime suspect.

Read the original here:
DNA expert disputes source of blood

Pokemon Origins | Myths and Mysteries | X and Y DNA Theory
Today in Myths and Mysteries we begin looking at X and Y Theories! Follow me on Twitter: http://www.twitter.com/TheOneIntegral Like me on Facebook: http://ww...

By: TheOneIntegral

Read the original here:
Pokemon Origins | Myths and Mysteries | X and Y DNA Theory - Video

Minecraft Dinosaurs - Part 67 - Spinosaurus DNA!
We find Spinosaurus DNA in Minecraft Dinosaurs Fan Revival mod! Minecraft Dinosaurs / Fossil and Archeology mod comes to life as we begin a new series on Meg...

By: Megneous

Read this article:
Minecraft Dinosaurs - Part 67 - Spinosaurus DNA! - Video

Animation Video Showing DNA Cage Construction
Animation Video Showing DNA Cage Construction SUBSCRIBE HERE: http://bit.ly/X6kG5b Credit: Hanadi Sleiman/McGill University For more science explained and te...

By: WiredVideoUK

View post:
Animation Video Showing DNA Cage Construction - Video

DNA Technology
Link this AE project file here:http://bit.ly/18gwTe5 "DNA Technology" is created in After Effects CS5 . The project is created to be really easy customized. ...

By: Only Best Projects After Effects

Read more:
DNA Technology - Video

Empire Of The Sun - DNA
Download #39;Ice on the Dune #39; on iTunes: http://smarturl.it/IceOnTheDuneiTunes?IQid=YT.DNAvideo Watch #39;Alive #39; video: http://www.youtube.com/watch?v=IPKAwJKGSDc ...

By: empireofthesunvevo

Here is the original post:
Empire Of The Sun - DNA - Video

Artist creates faces from DNA left in public
A New York artist collects human DNA and feeds it into a computer program to generate 3-D models of faces.

By: CNN

View post:
Artist creates faces from DNA left in public - Video

Minister for Justice Alan Shatter: the new Criminal Justice (Forensic Evidence and DNA Database) Bill is set to be published by the Minister next Tuesday. Photograph: Bryan OBrien/The Irish Times

Criminals convicted of serious offences will be required to submit a sample of DNA which will be retained on a centralised database to aid the Garda in solving future crimes, under new legislation.

The new Criminal Justice (Forensic Evidence and DNA Database) Bill is set to be published by Minister for Justice Alan Shatter next Tuesday after it was approved at yesterdays Cabinet meeting. The move follows repeated broken promises by successive governments on the creation of a DNA database, which is in operation in a large number of countries in the EU and farther afield.

DNA evidence can currently be used to link suspects to crimes and has solved hundreds of cases. However, garda must first identify the suspect on strong grounds before they can demand a DNA sample to cross-check against the DNA collected at a crime scene. Currently, samples cannot be retained for checking in future crimes. If a database existed, a DNA sample gathered from a crime scene or, for example, a gun, could immediately be checked against those many samples stored.

Database The creation of the database follows more than 10 years of legislative reform aimed at strengthening the Gardas hand in dealing with criminals. These have included the use of hearsay evidence in some trials, the power to detain suspects for periods of up to a week without charge, and the ability to plant electronic bugs and use in court the evidence they gather.

One informed security source said while the use of DNA databases in other jurisdictions had been used to catch sex offenders who left samples at the scene of a crime, they are also useful in tackling gangland criminals: If they left a piece of clothing behind, if a balaclava is found in a getaway car they tried to burn out, then [the database] comes into its own, especially in cases where there is no idea who might have been involved. It can throw up a suspect and it might save time in ruling out another suspect.

It is likely that human rights groups will campaign against what they would see as any overly intrusive elements to the law. However, Garda sources said many cases have been frustrated because DNA samples collected at crime scenes could not be checked against a database.

Continue reading here:
Criminals will be forced to give DNA sample under new legislation

Dance with DNA
DNA is the hereditary genetic material responsible for all the processes of a cell #39;s maintenance and growth. A variety of chemical agents found in the enviro...

By: TVSBSC

View post:
Dance with DNA - Video