July 27th, 2010 
Edward Replication
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Why does the lagging strand require more primers than the leading strand in DNA replication?
Why does the lagging strand require more primers than the leading strand in DNA replication? I understand the strands are antiparallel and nucleotides can only be added from 3′ to 5′, but Im still not drawing a reason. I would just imagine they would be mirror images of eachother.
But why does it have okazaki fragments?
The lagging strand in dna replication cannot be a simple mirror image of the leading strand due to the fact that you just mentioned- it will be going “upstream” instead of “downstream”. The lagging strand therefore has to make lots of little fragments known as okazagi fragments and join them up at the end. It is because of this that lots of RNA primers are used. Rna primers are used to start off each strand of complementary dna, As the lagging strand is unwound more dna is available for replication and each okazagi fragment is formed.
DVD Replication Process
Replication is the process that transfers data from the primary source of CD or DVD. It is often spoke with "duplication", and it was wrong that it is the same. Here we will try to reveal the mystery behind the replication.
Replication means copy that is not the original, something that has been copied or the act of making copies. When it comes to DVD replication , so that it refers to the process of 'pressing to 'copies of a glass master DVD on aluminum / polymer discs. Replication is the process that transfers data from the primary source to CD or DVD. It is often spoken with "duplication", and it is wrong that they are the same. DVD replication is a very different process duplication, however, which is the same type of process you use with the CD burner on your PC. Here we will try to reveal the mystery behind the replication
The results of the replication of DVDs are not normally vary, as many DVD replication equipment used is the industry standard. DVD replication companies and brokers are the only ones who can do the work for you. In general, they offer Also screen printing or offset printing on the DVD surface and the printing and packaging. Some even offer custom forms (Eg star shapes, oval DVD) and mini (8cm) DVD.
DVD replication gives you a simple duplication of your DVD master who will play on all DVD players and computers. The DVD can be printed on the label and the money is on the data side, except a special color was chosen.
Prerequisites DVD replication process
After mastering the source is subject to the manufacturing plant, it is first checked for unreadable sectors. It could be the result of an incomplete DVD-R or CD-R. Without this verification steps you may find yourself with many failed drives in the end. Before the current DVD replication startup process, we must check the following things;
DVD Duplication: Its actually burn DVDs. Duplication is a process where the laser "burn" pits into a dye that is manufactured inside the disc. Burning is the process used by readers in virtually every home or work computer used today.
Glass Mastering: When we speak of "pressure" discs, the first step is to transfer data from master to Mold a "master". In this case, it is called a master glass.
Stampers: You have heard before, but what is a matrix anyway? The master glass is used to create a matrix – the mold for the CD / DVD.
Casting of Discs: With stamps that are created, we are ready for molding discs. materials are molded polycarbonate with grooves on the stamps become disc.
At the beginning of the DVD replication process, which is usually in industrial or manufacturing plants, the source drive is checked for any part illegible.
DVD replication process involves the following steps
Pre-Mastering
At this point, inspects Abet Disc format and structure of support that is provided by the customer.
Mastering
DVD mastering is a process of numerical optimization preparing a DVD project for replication or duplication. Usually with related services such as printing labels and sleeve, DVD mastering includes both audio and audiovisual work.
A substrate treated with a photosensitive layer is prepared. A LBR (Laser Beam Recorder) is used to transfer your data / music and the shapes of pits and tracks on the development substrate.A solution allows areas that have been exposed by the laser to remove.
The substrate is placed in a vacuum deposition chamber and covered with a layer of silver. The final product is a coated glass master. There is then inspected and analyzed the properties of the electrical signal.
Deposits
Glass master is mounted and immersed in a solution of nickel sulfamate.
An electrolysis process takes place between two electrodes, the anode and the cathode. This creates a layer of nickel is separated from the glass master to obtain the stamper.
The stamp is rinsed dried and coated with a protective film. The back side is sanded and polished to prepare it for pressing. The stamps are then punched into the center and the outside and checked for uniform thickness.
Molding
The Stamper is placed into a special mold and pressed under high pressure. Molten polycarbonate is then injected into the mold and after a few seconds of cooling, a disc is ejected clear now containing the information or the pit track the stamper.
A thin layer of aluminum is sprayed on the surface of the transparent disk. This allows the disc to be read by the reflection of the laser on the information layer.
A thin layer of clear lacquer is then deposited on the metal surface of the disk, and then dried under a UV lamp. This is done to protect the CD
prepare itself for the screen or offset printing.
Pre-Press
The movie or the file is first reviewed by trained staff and monitoring compliance graphics, colors, sizes, resolution, fonts, etc. ..
pre-stretched screens are covered with a light-sensitive emulsion, dried and measured.
Once dried, a film positive is placed on the screen coated and exposed in a light unit for a specified period. After exposure, the emulsion developed are protected the film is washed with water. This leaves an area soaked with stencil printing emulsion free speech.
Silkscreen
Press ready screens are mounted on the printing press. The ink is placed on the screen and a squeegee crosses the area of the image by pressing ink through the screen and on the CD surface. A screen is required for each color. Once the ink is applied, it is instantly cured or dried under UV light before the next color is printed.
Each CD is inspected through a sophisticated optical hub for the correct identification and internal print quality.
The replication process DVD require quality, accuracy and speed from start to finish. DVD replication process involves creating a master disc of glass from a DVD or digital linear tape. The glass master is then used to manufacture discs additional physical footprint (stamping) data on their leaves or plastic substrates.
quality when DVD CD Replication is tap. If the need is to have 20 training programs responded to the offices in the world or a demo CD is required launch a group of celebrity, if the quality suffers because the project.
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