The fundamental basis of DNA microarrays is the process of hybridization. Two DNA strands hybridize if they are complementary to each other. Complementarity reflects the Watson-Crick rule that adenine (A) binds to thymine (T) and cytosine (C) binds to guanine (G). One or both strands of the DNA hybrid can be replaced by RNA and hybridization will still occur as long as there is complementarity.

Hybridization has for decades been used in molecular biology as the basis for such techniques as Southern blotting and Northern blotting. In Southern blotting, a small string of DNA, an oligonucleotide, is used to hybridize to complementary fragments of DNA that have been separated according to size in a gel electrophoresis. If the oligonucleotide is radioactively labeled, the hybridization can be visualized on a photographic film that is sensitive to radiation. In Northern blotting, a radio-labeled oligonucleotide is used to hybridize to messenger RNA that has been run through a gel. If the oligo is specific to a single messenger RNA, then it will bind to the location (band) of that messenger in the gel. The amount of radiation captured on a photographic film depends to some extent on the amount of radio-labeled probe present in the band, which again depends on the amount of messenger. So this method is a semiquantitative detection of individual messengers.

DNA arrays are a massively parallel version of’ Northern and Southern blotting. Instead of spreading the oligonucleotide probes over a gel containing samples of RNA or DNA, the oligonucleotide probes are attached to a surface. Different probes can be attached within micrometers of each other, so it is possible to place many of them on a small surface of one square centimeter, forming a DNA array. The sample is labeled fluorescently and added to the array. After washing away redundant unhybridized material, the hybridized material is excited by a laser and is detected by a light scanner that scans the surface of the chip. Because you know the location of each oligonucleotide probe, you can quantify the amount of sample hybridized to it from the image generated by the scan.

There is some contention in the literature on the use of the word “probe” in relation to microarrays. Throughout this article the word “probe” is used to refer to what is attached to the microarray surface. And the word “target” is used to refer to what is hybridized to the probes. Where before it was possible to run a couple of Northern blots or a couple of Southern blots in a day, it is now possible with DNA arrays to run hybridizations for tens of thousands of probes. This has in some sense revolutionized molecular biology and medicine. Instead of studying one gene and one messenger at a time, experimentalists are now studying many genes and many messengers at the same time. In fact, DNA arrays are frequently used to study all known messengers of an organism. This has opened the possibility of an entirely new, general view of how cells react in response to certain stimuli. It is also an entirely new way to study human disease by viewing how it affects the expression of all genes inside the cell.

Gold Rush?

Some basic information about the DNA can be found at the DNA encyclopedia. The explosion in interest in DNA microarrays has almost been like a gold rush. Is there really that much gold to be found with this new technology? I am afraid that, in the short term, there will be some disappointments. Yes, you can learn about the gene expression in your organism or disease of interest, but does that make you wiser? Typically, the wealth of data generated results in more questions than answers. There is one exception to this, and that is where DNA arrays have been used for diagnostics and prognostics. Here, DNA arrays have shown promising results in almost all the fields where they have been applied. This is where I think that the greatest short-term success of DNA microarray technology lies.

On a longer time scale molecular biology will benefit tremendously from the systemic approach offered by DNA microarrays and other massively parallel approaches. Many significant discoveries lie in the interpretation of microarray data – more so from large compilations of experiments and large-scale experiments than from small experiments with just a few arrays.

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If you’re someone who suffers from certain health problems, there are probably limitations to what you can do based on the medication you take and the severity of your condition. Medication IDs and jewelry can really help you out in an emergency situation. There are a number of different styles and kinds of jewelry that you can wear to be able to let someone know about your condition in the case of an emergency.

One of the most common kinds of medication jewelry is the kind that shows that you have a certain allergy. Children often wear bracelets to school saying they have a peanut allergy or some other type of allergy. This way, teachers and cafeteria workers will know that certain child can’t have certain foods, but they can also realize when the child is having an allergic reaction and administer the proper medication to prevent any further damage.

Adults can also wear allergy bracelets or necklaces to let someone know they’re allergic to penicillin or other kinds of medication. This way, if they’re in an accident or injured, the doctors will know not to give them certain things that will hurt them. Diabetes bracelets are often common in diabetes patients, because a person with diabetes can pass out from not having a balanced blood sugar. If they wear the bracelet, someone will know to get some glucose in their system.

As far as styles go, medication jewelry has a variety of different options. If you don’t want the standard metal bracelet that tells everyone you have an illness, you can opt for something more or less flashy. You can get medication ID watches these days that simply have a red cross on the face to let someone know to look at the engraving on the back of the watch in case of an emergency. You can also get a leather or hemp bracelet that tells people your information. You can get all different kinds of necklaces as well.

You can also create medication ID cards online that contain pertinent information about your health so that if you fall ill or are in a car accident, someone can read about you, what conditions or problems you might have, what medication you are on, and even the name of your family doctor. These wallet cards can be created by you and your doctor and then printed out to carry with you in case of an emergency. The information you choose to put on the card is up to you.

In addition to wallet ID cards and jewelry, you can also make a small schedule of the medications you’re on to carry with you. This will help you to remember when to take them. If you have a child who has to take certain medicines at school, giving them a medication schedule will help them take responsibility for health and will help their teacher administer the right medicine at the right time.

To find a free tool that organizes your medication and reminds you to take your medicine by email and text go to medication management or medicine chart.

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