PDA

View Full Version : Nanomedicine



priyarock
12-22-2003, 01:48 AM
some pictures about nanomedicine

for more information check out www.foresight.org

Cell repair machines

http://www.foresight.org/Nanomedicine/Gallery/Images/CellRepAlc2.gif

Future medical microorganisms incorporating these molecular-scale computers, or nanocomputers, as part of their structure will be able to perform extremely sophisticated biological repairs. Since these artificial organisms will be so unlike any in nature today, we will probably think of them as microscopic machines rather than as organisms. We could call them cell repair devices.


DNA repair machine

http://www.foresight.org/Nanomedicine/Gallery/Images/TimeLifeNM.jpeg


With a diameter of only 50 nanometers, the repair vessel would be smaller than most bacteria and viruses, yet capable of therapies and cures well beyond the reach of present-day physicians.

sri_gan
12-22-2003, 03:02 AM
Wow.. This is an interesting information. Ithelam enna studies la varum? microbiology?

priyarock
12-22-2003, 03:03 AM
Ithelam Bio-Iinformatics or Nanotechnology field-le varum sri_gan.

sri_gan
12-22-2003, 03:08 AM
Well,

Its really interesting... neriya intha mari visheyam kondu vanga :yes:

priyarock
12-23-2003, 11:57 PM
Sure, Sri_gan I will put up if i come across such stuffs..

P.S: yet to get a hold on other topics in geetham..It is like jet lag to me,..unable to get in to stream with topics in geetham....

sri_gan
12-24-2003, 12:01 AM
Start here..

http://www.geetham.net/forums/viewtopic.php?t=5032

There are 2 or 3 topics which will be always hot in discussion.

poga poga palhirum ungalukku.

bel
01-15-2004, 02:22 AM
is this all true??

mpalanieppan
01-19-2004, 11:27 PM
I guess these are illustrations of what is possible if the research of nanotechnology produces results. Kind of predictions...I guess there is still a long way to go....

sundaraveena
04-30-2004, 01:47 PM
A beginner's guide to nanotechnology
Rocky Angelucci
Special Contributor

From the September 7, 2001 print edition, Dallas Business Journal

The word nanotechnology means different things to different people.

For some, it conjures up images of fabulous new materials, lighter and stronger than steel. Others envision microscopic robots that clean plaque from our arteries and tartar from our teeth.

Clearly, nanotechnology has captured the attention of the scientific community, the media and now the public, but just exactly what is it?

In the purest sense, nanotechnology is the science of small -- very small -- things measured in units called nanometers, which are one-billionth of a meter. Put another way, a nanometer is so small that if one meter were stretched from New York to Los Angeles, each nanometer would still be only the size of an aspirin.

Scientists studying molecular nanotechnology are interested in ways in which we might manipulate individual atoms and molecules to build things with almost unimaginable precision.

Building things with atomic precision is an amazing contrast to the manufacturing techniques of today, which are very crude when examined at the molecular level.

Today, making a smooth edge requires manufacturers to grind away and discard trillions of atoms. Much in the way Michelangelo created statues from blocks of marble, manufacturers today frequently create objects by first creating larger objects and then removing excess material by grinding, chiseling or sanding. Components that seem to fit together precisely are really billions of atoms out of alignment. Poorly fitting components wear faster, require costly lubrication and eventually lead to mechanical breakdown.
From a molecular perspective, even the most precise of today's mechanical components fit poorly. These factors plague modern manufacturing techniques causing enormous waste, pollution and imprecision.

Enter molecular nanotechnology. The ability to precisely pick and place individual atoms and molecules will allow us to create objects with almost perfect efficiency. Right now, scientists are picking up and moving individual atoms of silicon and other materials using scanning tunneling microscopy. STM uses an amazingly sharp tip, usually made of tungsten, to push atoms around on a surface.

This is only the beginning. As the technology improves, we will be able to move hundreds, thousands and then millions of atoms at will to precisely construct objects of virtually any size, shape and material.

Objects created using molecular nanotechnology will be precise to within the size of a molecule. Machined components will no longer abrade one another because they will fit together with molecular precision. Moreover, they will have been made with virtually no waste or pollution. They will have been made one atom at a time with readily available components like carbon, oxygen and nitrogen as their building blocks.

Nanotech factories will transform today's crude, inefficient, polluting factories into factories able to build many different things with little or no modification economically and cleanly.
In addition to making cleaner products, we'll be able to make smaller ones. Much smaller. When we can place individual atoms, we will be able to construct devices at an almost unimaginable scale.

Equipped with nanotechnology design tools that resemble today's computer-aided- design software, engineers of the future will design devices smaller than can be seen with the naked eye.

Medical science will be able to create devices small enough to enter the body's bloodstream to repair damage and treat diseases at the cellular level. For example, instead of treating cancer using chemotherapy that weakens the entire body, nanotechnology will one day produce medical devices that can identify cancer cells and repair or destroy them with no damage to healthy tissue.

This manufacturing revolution will also give rise to startling advances in material science. Instead of steel or aluminum being mined from the ground, new materials will be made from carbon atoms in the form of nanotubes and related structures. A single-walled, carbon nanotube is a strawlike structure with a one-atom-thick wall of carbon atoms. Lighter, stronger and more flexible than steel, carbon nanotubes are believed by many to be the most promising of all nanomaterials.

While carbon nanotubes are still too expensive to use in everyday construction materials, the cost of producing them has decreased twentyfold over the past five years. As they continue to get cheaper to produce, manufacturers will develop innovative uses for them in a wide array of manufacturing applications.

The presence of carbon nanotubes today doesn't prove we'll one day be able to produce tiny medical devices that enter the body and cure cancer. So what makes scientists believe this sort of thing will be possible? The answer is simple.
Nature.

Living cells are perfect examples of nanoscale devices that assemble structures one atom or molecule at a time. DNA is copied, proteins are formed and complex hormones are manufactured by cellular devices far more complex than the most advanced manufacturing processes we have today.

An acorn, for example, uses the energy within it to read the "computer program" -- the DNA -- to sprout roots and leaves to gather more energy from the soil and the sun. The computer program tells the acorn to rearrange the atoms in soil, air and water to produce an oak tree -- a material far more complex than today's material science can produce.

If scientists can create a nanoscale assembly device with only a fraction of the capabilities of the simplest biological cell, commercial nanotechnology will be a reality.

But if nanotechnology produces things one atom at a time, how will we ever be able to produce something that contains trillions of atoms? Won't that take far too long?

If devices are constructed one atom at a time it will take millions of years to produce even the simplest mechanical device. That's where parallel assembly comes in.

Imagine a nanoscale robotic arm, much like its larger cousin on today's automobile assembly line. Only this robotic arm would have a "sticky" tip suitable for picking up and placing individual atoms. This robotic arm's first task, under computer control, would be to make a copy of itself, thus resulting in two robotic arms. Those two would make two more. The four would become eight. Then 16 and so on.

In a short while, the assembly device would contain millions of microscopic robotic arms, all capable of picking and placing atoms. Once that point is reached, the computer software will begin instructing the robotic arms to build the required product in parallel with a million times more bandwidth than the single arm. This process is called parallel assembly.

Some argue such an approach runs the risk the robotic arms would somehow get out of control and replicate unabated, but very few learned scientists fear such a scenario.
Because the robotic arms are guided by external computer control, the idea of them propagating out of control is laughable. Such a scenario is as outrageous as an automobile assembly line suddenly running amok and filling the world with cars or a commercial aircraft suddenly becoming feral and swooping down to feed off livestock.

Far from being the stuff of science fiction, nanotechnology promises to be the next technological revolution, with cleaner, cheaper and more flexible manufacturing capabilities than exist anywhere in the world today. Enhanced materials will be lighter, stronger and more flexible than steel; nanosized devices will improve our quality and quantity of life.
While many disagree how long such a future will take to materialize, very few dispute it will happen. Momentum toward this nanotechnology future is building as researchers, private companies and government agencies all over the world rush to be the leaders in this very exciting race.

The future is small, but it promises to benefit us all.

Angelucci is technical liaison with Dallas-based Zyvex Corp.