It seems like magic. A small appliance, about the size of a washing machine, that is able to manufacture almost anything. It is called a nanofactory. Fed with simple chemical stocks, this amazing machine breaks down molecules, and then reassembles them into any product you ask for. Packed with nanotechnology and robotics, weighing 200 pounds and standing half as tall as a person, it can produce two tons per day of products. Control is simple: a touch screen selects the type and number of products to produce. It costs very little to operate, just the price of materials fed into it. In one hour, $20 worth of chemicals can be converted into 100 pairs of shoes, or 50 shovels, or 200 cell phones, or even a duplicate nanofactory!
Impossible? Today, maybe, but not tomorrow. The technology to create such a machine is speedily being developed. A nanofactory will be the end result of a convergence between nanotechnology (molecular scale engineering), rapid prototyping, and automated assembly. These are all present-day technologies. None of them has yet reached its full potential, but each of them is advancing rapidly, driven by powerful economic, social, and military forces. The integration of the three technologies will be far more powerful than the sum of the parts.
Some experts claim that a crash program started today could complete the first working nanofactory within a decade at a cost of between five and ten billion dollars. And once the first one is built, it can start making copies of itself. Five to ten billion dollars is a lot of money, of course, and many people will question if it could not be better spent on something else. But imagine the economic, environmental and humanitarian benefits, when nearly any product can be manufactured on the spot for about $1 per pound. No more shipping costs or time spent waiting. No more wasted resources or hazardous byproducts. No more starvation, homelessness, or poverty.
Already scientists have made chemical reactions happen by directly manipulating the individual atoms. They can draw lines of chemicals only ten atoms wide. They can send electricity down molecular wires. They can attach propellers to molecular motors and analyze their performance. They can make functioning tweezers from DNA molecules. Within a few years, we will have the ability to build three-dimensional, active, molecular constructions. It's a small and predictable step to building robots and chemical plants at the nanometer scale.
It sounds too good to be true: a non-polluting, personal-size machine that within a few hours and for a few dollars can manufacture almost anything—clothing, books, tools, communication devices—but there is a catch. It can also manufacture weapons, poisons, tiny surveillance cameras, and other illicit products. How will this be controlled?
Imagine the possibilities! And the problems...
20.5.08
What is nanotechnology all about?
What is nanotechnology all about?
Nanotechnology is the engineering of tiny machines — the projected ability to build things from the bottom up inside personal nanofactories (PNs), using techniques and tools being developed today to make complete, highly advanced products. Ultimately, nanotechnology will enable control of matter at the nanometer scale, using mechanochemistry. Shortly after this envisioned molecular machinery is created, it will result in a manufacturing revolution, probably causing severe disruption. It also has serious economic, social, environmental, and military implications.
A nanometer is one billionth of a meter, roughly the width of three or four atoms. The average human hair is about 25,000 nanometers wide.
You can see a longer explanation here. And to check out more of those tiny machines, click here.
What's a personal nanofactory?
It's a proposed new appliance, something that might sit on a countertop in your home. To build a personal nanofactory (PN), you need to start with a working fabricator, a nanoscale device that can combine individual molecules into useful shapes. A fabricator could build a very small nanofactory, which then could build another one twice as big, and so on. Within a period of weeks, you have a tabletop model.
◄ Click to enlarge
Artwork by John Burch, Lizard Fire Studios (3D Animation, Game Development)
Products made by a PN will be assembled from nanoblocks, which will be fabricated within the nanofactory. Computer aided design (CAD) programs will make it possible to create state-of-the-art products simply by specifying a pattern of predesigned nanoblocks. The question of when we will see a flood of nano-built products boils down to the question of how quickly the first fabricator can be designed and built.
MOVIE TIME: A short film called Productive Nanosystems: from Molecules to Superproducts depicts an animated view of a nanofactory and demonstrates key steps in the sample process that converts basic molecules into a billion-CPU laptop computer. The 4-minute streaming video is online here.
What could nanofactories produce?
Lifesaving medical robots or untraceable weapons of mass destruction.
Networked computers for everyone in the world or networked cameras so governments can watch our every move.
Trillions of dollars of abundance or a vicious scramble to own everything.
Rapid invention of wondrous products or weapons development fast enough to destabilize any arms race.
How does 'mechanochemistry' work?
It's a bit like enzymes (if you know your chemistry): you fix onto a molecule or two, then twist or pull or push in a precise way until a chemical reaction happens right where you want it. This happens in a vacuum, so you don't have water molecules bumping around. It's a lot more controllable that way.
So, if you want to add an atom to a surface, you start with that atom bound to a molecule called a "tool tip" at the end of a mechanical manipulator. You move the atom to the point where you want it to end up. You move the atom next to the surface, and make sure that it has a weaker bond to the tool tip than to the surface. When you bring them close enough, the bond will transfer. This is ordinary chemistry: an atom moving from one molecule to another when they come close enough to each other, and when the movement is energetically favorable. What's different about mechanochemistry is that the tool tip molecule can be positioned by direct computer control, so you can do this one reaction at a wide variety of sites on the surface. Just a few reactions give you a lot of flexibility in what you make.
MECHANOSYNTHETIC REACTIONS Based on quantum chemistry by Walch and Merkle [Nanotechnology, 9, 285 (1998)], to deposit carbon, a device moves a vinylidenecarbene along a barrier-free path to bond to a diamond (100) surface dimer, twists 90° to break a pi bond, and then pulls to cleave the remaining sigma bond.
Why do some scientists dismiss this stuff as science fiction?
The whole concept of advanced nanotechnology — molecular manufacturing (MM) — is so complex and unfamiliar, and so staggering in its implications, that a few scientists, engineers, and other pundits have flatly declared it to be impossible. The debate is further confused by science-fictional hype and media misconceptions.
It should be noted that none of those who dismiss MM are experts in the field. They may work in chemistry, biotechnology, or other nanoscale sciences or technologies, but are not sufficiently familiar with MM theory to critique it meaningfully.
Many of the objections, including those of the late Richard Smalley, do not address the actual published proposals for MM. The rest are unfounded and incorrect assertions, contradicted by detailed calculations based on the relevant physical laws.
Is nanotechnology bad or good?
Nanotechnology offers great potential for benefit to humankind, and also brings severe dangers. While it is appropriate to examine carefully the risks and possible toxicity of nanoparticles and other products of nanoscale technology, the greatest hazards are posed by malicious or unwise use of molecular manufacturing. CRN's focus is on designing and promoting mechanisms for safe development and effective administration of MM.
If MM is so dangerous, why not just completely ban all research and development?
Viewed with pessimism, molecular manufacturing could appear far too risky to be allowed to develop to anywhere near its full potential. However, a naive approach to limiting R&D, such as relinquishment, is flawed for at least two reasons. First, it will almost certainly be impossible to prevent the development of MM somewhere in the world. China, Japan, and other Asian nations have thriving nanotechnology programs, and the rapid advance of enabling technologies such as biotechnology, MEMS, and scanning-probe microscopy ensures that R&D efforts will be far easier in the near future than they are today. Second, MM will provide benefits that are simply too good to pass up, including environmental repair; clean, cheap, and efficient manufacturing; medical breakthroughs; immensely powerful computers; and easier access to space.
What about "grey goo"?
The dangers of self-replicating nanobots — the so-called grey goo — have been widely discussed, and it is generally perceived that molecular manufacturing is uncomfortably close to grey goo. However, the proposed production system that CRN supports does not involve free-floating assemblers or nanobots, but much larger factories with all the nanoscale machinery fastened down and inert without external control. As far as we know, a self-replicating mechanochemical nanobot is not excluded by the laws of physics, but such a thing would be extremely difficult to design and build even with a full molecular manufacturing capability. Fiction like Michael Crichton's Prey might be good entertainment, but it's not very good science.
How soon will molecular manufacturing be developed?
Based on our studies, CRN believes that molecular manufacturing could be successfully developed within the next ten years, and almost certainly will be developed within twenty years. For more, see our Timeline page.
Shouldn't we be working on current problems like poverty, pollution, and stopping terrorism, instead of putting money into these far future technologies?
We should do both! Development and application of molecular manufacturing clearly can have a positive impact on solving many of today's most urgent problems. But it's equally clear than MM can exacerbate many of society's ills. Knowing that it may be developed within the next decade or two (which is not "far future"), makes preparation for MM an urgent priority.
Nanotechnology is the engineering of tiny machines — the projected ability to build things from the bottom up inside personal nanofactories (PNs), using techniques and tools being developed today to make complete, highly advanced products. Ultimately, nanotechnology will enable control of matter at the nanometer scale, using mechanochemistry. Shortly after this envisioned molecular machinery is created, it will result in a manufacturing revolution, probably causing severe disruption. It also has serious economic, social, environmental, and military implications.
A nanometer is one billionth of a meter, roughly the width of three or four atoms. The average human hair is about 25,000 nanometers wide.
You can see a longer explanation here. And to check out more of those tiny machines, click here.
What's a personal nanofactory?
It's a proposed new appliance, something that might sit on a countertop in your home. To build a personal nanofactory (PN), you need to start with a working fabricator, a nanoscale device that can combine individual molecules into useful shapes. A fabricator could build a very small nanofactory, which then could build another one twice as big, and so on. Within a period of weeks, you have a tabletop model.
◄ Click to enlarge
Artwork by John Burch, Lizard Fire Studios (3D Animation, Game Development)
Products made by a PN will be assembled from nanoblocks, which will be fabricated within the nanofactory. Computer aided design (CAD) programs will make it possible to create state-of-the-art products simply by specifying a pattern of predesigned nanoblocks. The question of when we will see a flood of nano-built products boils down to the question of how quickly the first fabricator can be designed and built.
MOVIE TIME: A short film called Productive Nanosystems: from Molecules to Superproducts depicts an animated view of a nanofactory and demonstrates key steps in the sample process that converts basic molecules into a billion-CPU laptop computer. The 4-minute streaming video is online here.
What could nanofactories produce?
Lifesaving medical robots or untraceable weapons of mass destruction.
Networked computers for everyone in the world or networked cameras so governments can watch our every move.
Trillions of dollars of abundance or a vicious scramble to own everything.
Rapid invention of wondrous products or weapons development fast enough to destabilize any arms race.
How does 'mechanochemistry' work?
It's a bit like enzymes (if you know your chemistry): you fix onto a molecule or two, then twist or pull or push in a precise way until a chemical reaction happens right where you want it. This happens in a vacuum, so you don't have water molecules bumping around. It's a lot more controllable that way.
So, if you want to add an atom to a surface, you start with that atom bound to a molecule called a "tool tip" at the end of a mechanical manipulator. You move the atom to the point where you want it to end up. You move the atom next to the surface, and make sure that it has a weaker bond to the tool tip than to the surface. When you bring them close enough, the bond will transfer. This is ordinary chemistry: an atom moving from one molecule to another when they come close enough to each other, and when the movement is energetically favorable. What's different about mechanochemistry is that the tool tip molecule can be positioned by direct computer control, so you can do this one reaction at a wide variety of sites on the surface. Just a few reactions give you a lot of flexibility in what you make.
MECHANOSYNTHETIC REACTIONS Based on quantum chemistry by Walch and Merkle [Nanotechnology, 9, 285 (1998)], to deposit carbon, a device moves a vinylidenecarbene along a barrier-free path to bond to a diamond (100) surface dimer, twists 90° to break a pi bond, and then pulls to cleave the remaining sigma bond.
Why do some scientists dismiss this stuff as science fiction?
The whole concept of advanced nanotechnology — molecular manufacturing (MM) — is so complex and unfamiliar, and so staggering in its implications, that a few scientists, engineers, and other pundits have flatly declared it to be impossible. The debate is further confused by science-fictional hype and media misconceptions.
It should be noted that none of those who dismiss MM are experts in the field. They may work in chemistry, biotechnology, or other nanoscale sciences or technologies, but are not sufficiently familiar with MM theory to critique it meaningfully.
Many of the objections, including those of the late Richard Smalley, do not address the actual published proposals for MM. The rest are unfounded and incorrect assertions, contradicted by detailed calculations based on the relevant physical laws.
Is nanotechnology bad or good?
Nanotechnology offers great potential for benefit to humankind, and also brings severe dangers. While it is appropriate to examine carefully the risks and possible toxicity of nanoparticles and other products of nanoscale technology, the greatest hazards are posed by malicious or unwise use of molecular manufacturing. CRN's focus is on designing and promoting mechanisms for safe development and effective administration of MM.
If MM is so dangerous, why not just completely ban all research and development?
Viewed with pessimism, molecular manufacturing could appear far too risky to be allowed to develop to anywhere near its full potential. However, a naive approach to limiting R&D, such as relinquishment, is flawed for at least two reasons. First, it will almost certainly be impossible to prevent the development of MM somewhere in the world. China, Japan, and other Asian nations have thriving nanotechnology programs, and the rapid advance of enabling technologies such as biotechnology, MEMS, and scanning-probe microscopy ensures that R&D efforts will be far easier in the near future than they are today. Second, MM will provide benefits that are simply too good to pass up, including environmental repair; clean, cheap, and efficient manufacturing; medical breakthroughs; immensely powerful computers; and easier access to space.
What about "grey goo"?
The dangers of self-replicating nanobots — the so-called grey goo — have been widely discussed, and it is generally perceived that molecular manufacturing is uncomfortably close to grey goo. However, the proposed production system that CRN supports does not involve free-floating assemblers or nanobots, but much larger factories with all the nanoscale machinery fastened down and inert without external control. As far as we know, a self-replicating mechanochemical nanobot is not excluded by the laws of physics, but such a thing would be extremely difficult to design and build even with a full molecular manufacturing capability. Fiction like Michael Crichton's Prey might be good entertainment, but it's not very good science.
How soon will molecular manufacturing be developed?
Based on our studies, CRN believes that molecular manufacturing could be successfully developed within the next ten years, and almost certainly will be developed within twenty years. For more, see our Timeline page.
Shouldn't we be working on current problems like poverty, pollution, and stopping terrorism, instead of putting money into these far future technologies?
We should do both! Development and application of molecular manufacturing clearly can have a positive impact on solving many of today's most urgent problems. But it's equally clear than MM can exacerbate many of society's ills. Knowing that it may be developed within the next decade or two (which is not "far future"), makes preparation for MM an urgent priority.
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What is Nanotechnology?
A basic definition: Nanotechnology is the engineering of functional systems at the molecular scale. This covers both current work and concepts that are more advanced.
In its original sense, 'nanotechnology' refers to the projected ability to construct items from the bottom up, using techniques and tools being developed today to make complete, high performance products.
With 15,342 atoms, this parallel-shaft speed reducer gear is one of the largest nanomechanical devices ever modeled in atomic detail. LINK
The Meaning of Nanotechnology
When K. Eric Drexler (right) popularized the word 'nanotechnology' in the 1980's, he was talking about building machines on the scale of molecules, a few nanometers wide—motors, robot arms, and even whole computers, far smaller than a cell. Drexler spent the next ten years describing and analyzing these incredible devices, and responding to accusations of science fiction. Meanwhile, mundane technology was developing the ability to build simple structures on a molecular scale. As nanotechnology became an accepted concept, the meaning of the word shifted to encompass the simpler kinds of nanometer-scale technology. The U.S. National Nanotechnology Initiative was created to fund this kind of nanotech: their definition includes anything smaller than 100 nanometers with novel properties.
Much of the work being done today that carries the name 'nanotechnology' is not nanotechnology in the original meaning of the word. Nanotechnology, in its traditional sense, means building things from the bottom up, with atomic precision. This theoretical capability was envisioned as early as 1959 by the renowned physicist Richard Feynman.
I want to build a billion tiny factories, models of each other, which are manufacturing simultaneously. . . The principles of physics, as far as I can see, do not speak against the possibility of maneuvering things atom by atom. It is not an attempt to violate any laws; it is something, in principle, that can be done; but in practice, it has not been done because we are too big. — Richard Feynman, Nobel Prize winner in physics
Based on Feynman's vision of miniature factories using nanomachines to build complex products, advanced nanotechnology (sometimes referred to as molecular manufacturing) will make use of positionally-controlled mechanochemistry guided by molecular machine systems. Formulating a roadmap for development of this kind of nanotechnology is now an objective of a broadly based technology roadmap project led by Battelle (the manager of several U.S. National Laboratories) and the Foresight Nanotech Institute.
Shortly after this envisioned molecular machinery is created, it will result in a manufacturing revolution, probably causing severe disruption. It also has serious economic, social, environmental, and military implications.
Four Generations
Mihail (Mike) Roco of the U.S. National Nanotechnology Initiative has described four generations of nanotechnology development (see chart below). The current era, as Roco depicts it, is that of passive nanostructures, materials designed to perform one task. The second phase, which we are just entering, introduces active nanostructures for multitasking; for example, actuators, drug delivery devices, and sensors. The third generation is expected to begin emerging around 2010 and will feature nanosystems with thousands of interacting components. A few years after that, the first integrated nanosystems, functioning (according to Roco) much like a mammalian cell with hierarchical systems within systems, are expected to be developed.
Some experts may still insist that nanotechnology can refer to measurement or visualization at the scale of 1-100 nanometers, but a consensus seems to be forming around the idea (put forward by the NNI's Mike Roco) that control and restructuring of matter at the nanoscale is a necessary element. CRN's definition is a bit more precise than that, but as work progresses through the four generations of nanotechnology leading up to molecular nanosystems, which will include molecular manufacturing, we think it will become increasingly obvious that "engineering of functional systems at the molecular scale" is what nanotech is really all about.
Conflicting Definitions
Unfortunately, conflicting definitions of nanotechnology and blurry distinctions between significantly different fields have complicated the effort to understand the differences and develop sensible, effective policy.
The risks of today's nanoscale technologies (nanoparticle toxicity, etc.) cannot be treated the same as the risks of longer-term molecular manufacturing (economic disruption, unstable arms race, etc.). It is a mistake to put them together in one basket for policy consideration—each is important to address, but they offer different problems and will require different solutions. As used today, the term nanotechnology usually refers to a broad collection of mostly disconnected fields. Essentially, anything sufficiently small and interesting can be called nanotechnology. Much of it is harmless. For the rest, much of the harm is of familiar and limited quality. But as we will see, molecular manufacturing will bring unfamiliar risks and new classes of problems.
General-Purpose Technology
Nanotechnology is sometimes referred to as a general-purpose technology. That's because in its advanced form it will have significant impact on almost all industries and all areas of society. It will offer better built, longer lasting, cleaner, safer, and smarter products for the home, for communications, for medicine, for transportation, for agriculture, and for industry in general.
Imagine a medical device that travels through the human body to seek out and destroy small clusters of cancerous cells before they can spread. Or a box no larger than a sugar cube that contains the entire contents of the Library of Congress. Or materials much lighter than steel that possess ten times as much strength. — U.S. National Science Foundation
Dual-Use Technology
Like electricity or computers before it, nanotech will offer greatly improved efficiency in almost every facet of life. But as a general-purpose technology, it will be dual-use, meaning it will have many commercial uses and it also will have many military uses—making far more powerful weapons and tools of surveillance. Thus it represents not only wonderful benefits for humanity, but also grave risks.
A key understanding of nanotechnology is that it offers not just better products, but a vastly improved manufacturing process. A computer can make copies of data files—essentially as many copies as you want at little or no cost. It may be only a matter of time until the building of products becomes as cheap as the copying of files. That's the real meaning of nanotechnology, and why it is sometimes seen as "the next industrial revolution."
My own judgment is that the nanotechnology revolution has the potential to change America on a scale equal to, if not greater than, the computer revolution. — U.S. Senator Ron Wyden (D-Ore.)
The power of nanotechnology can be encapsulated in an apparently simple device called a personal nanofactory that may sit on your countertop or desktop. Packed with miniature chemical processors, computing, and robotics, it will produce a wide-range of items quickly, cleanly, and inexpensively, building products directly from blueprints.
◄ Click to enlarge
Artist's Conception of a Personal Nanofactory
Courtesy of John Burch, Lizard Fire Studios (3D Animation, Game Development)
Exponential Proliferation
Nanotechnology not only will allow making many high-quality products at very low cost, but it will allow making new nanofactories at the same low cost and at the same rapid speed. This unique (outside of biology, that is) ability to reproduce its own means of production is why nanotech is said to be an exponential technology. It represents a manufacturing system that will be able to make more manufacturing systems—factories that can build factories—rapidly, cheaply, and cleanly. The means of production will be able to reproduce exponentially, so in just a few weeks a few nanofactories conceivably could become billions. It is a revolutionary, transformative, powerful, and potentially very dangerous—or beneficial—technology.
How soon will all this come about? Conservative estimates usually say 20 to 30 years from now, or even much later than that. However, CRN is concerned that it may occur sooner, quite possibly within the next decade. This is because of the rapid progress being made in enabling technologies, such as optics, nanolithography, mechanochemistry and 3D prototyping. If it does arrive that soon, we may not be adequately prepared, and the consequences could be severe.
We believe it's not too early to begin asking some tough questions and facing the issues:
Who will own the technology?
Will it be heavily restricted, or widely available?
What will it do to the gap between rich and poor?
How can dangerous weapons be controlled, and perilous arms races be prevented?
Many of these questions were first raised over a decade ago, and have not yet been answered. If the questions are not answered with deliberation, answers will evolve independently and will take us by surprise; the surprise is likely to be unpleasant.
It is difficult to say for sure how soon this technology will mature, partly because it's possible (especially in countries that do not have open societies) that clandestine military or industrial development programs have been going on for years without our knowledge.
We cannot say with certainty that full-scale nanotechnology will not be developed with the next ten years, or even five years. It may take longer than that, but prudence—and possibly our survival—demands that we prepare now for the earliest plausible development scenario.
More Background on Nanotechnology:
Nanotechnology Basics - For students and other learners
Managing Magic - A brief overview of the challenges posed by advanced nanotechnology
Nanotechnology on an Upward Slope - An online PowerPoint presentation
Turn on the Nanotech High Beams - An essay published by Future Brief
Nano Simulation - A way to visualize what is meant by molecular manufacturing
Debating the Future of Nanotechnology - Perspective from the Foresight Institute
Safe Utilization of Advanced Nanotechnology - One of the founding papers of CRN
5-Minute Nanosystems - A quick summary of Eric Drexler's foundational work on nanotechnology
Nanotechnology Press Kit - Compiled and published by Nanotechnology Now
CRN is a non-profit research and advocacy organization, completely dependent on small grants and individual contributions.
17.5.08
प्रेवेंत हार्ट Attack
Thought this is a useful article to share. Youngsters to start early. Take care.
A chat with Dr.Devi Shetty, Narayana Hrudayalaya
(Heart Specialist) Bangalore was arranged by WIPRO for its employees .
The transcript of the chat is given below. Useful for everyone.
Qn: What are the thumb rules for a layman to take care of his heart?
Ans:
1. Diet - Less of carbohydrate, more of protein, less oil
2. Exercise - Half an hour's walk, at least five days a week; avoid lifts and avoid sitting for a longtime
3. Quit smoking
4. Control weight
5. Control blood pressure and sugar
Qn: Is eating non-veg food (fish) good for the heart?
Ans: No
Qn: It's still a grave shock to hear that some apparently healthy person
gets a cardiac arrest. How do we understand it in perspective?
Ans: This is called silent attack; that is why we recommend everyone past the age of 30 to undergo routine health checkups.
Qn: Are heart diseases hereditary?
Ans: Yes
Qn: What are the ways in which the heart is stressed? What practices do you suggest to de-stress?
Ans: Change your attitude towards life. Do not look for perfection in everything in life.
Qn: Is walking better than jogging or is more intensive exercise required to keep a healthy heart?
Ans: Walking is better than jogging since jogging leads to early fatigue and injury to joints
Qn: You have done so much for the poor and needy. What has inspired you to do so?
Ans: Mother Theresa , who was my patient
Qn: Can people with low blood pressure suffer heart diseases?
Ans: Extremely rare
Qn: Does cholesterol accumulates right from an early age
(I'm currently only 22) or do you have to worry about it only after you are above 30 years of age?
Ans: Cholesterol accumulates from childhood.
Qn: How do irregular eating habits affect the heart ?
Ans: You tend to eat junk food when the habits are irregular and your body's enzyme release for digestion gets confused.
Qn: How can I control cholesterol content without using medicines?
Ans: Control diet, walk and eat walnut.
Qn: Can yoga prevent heart ailments?
Ans: Yoga helps.
Qn: Which is the best and worst food for the heart?
Ans: Fruits and vegetables are the best and the worst is oil.
Qn: Which oil is better - groundnut, sunflower, olive?
Ans: All oils are bad .
Qn: What is the routine checkup one should go through? Is there any specific test?
Ans: Routine blood test to ensure sugar, cholesterol is ok. Check BP, Treadmill test after an echo.
Qn: What are the first aid steps to be taken on a heart attack?
Ans: Help the person into a sleeping position , place an aspirin tablet under the tongue with a sorbitrate tablet if available, and rush him to a coronary care unit since the maximum casualty takes place within the first hour.
Qn: How do you differentiate between pain caused by a heart attack and that caused due to gastric trouble?
Ans: Extremely difficult without ECG.
Qn: What is the main cause of a steep increase in heart problems amongst youngsters? I see people of about 30-40 yrs of age having heart attacks and serious heart problems.
Ans: Increased awareness has increased incidents. Also, s edentary lifestyles, smoking, junk food, lack of exercise in a country where people are genetically three times more vulnerable for heart attacks than Europeans and Americans.
Qn: Is it possible for a person to have BP outside the normal range of 120/80 and yet be perfectly healthy?
Ans: Yes.
Qn: Marriages within close relatives can lead to heart problems for the child. Is it true?
Ans : Yes, co-sanguinity leads to congenital abnormalities and you may not have a software engineer as a child
Qn: Many of us have an irregular daily routine and many a times we have to stay late nights in office. Does this affect our heart ? What precautions would you recommend?
Ans : When you are young, nature protects you against all these irregularities. However, as you grow older, respect the biological clock.
Qn: Will taking anti-hypertensive drugs cause some other complications (short / long term)?
Ans : Yes, most drugs have some side effects. However, modern anti-hypertensive drugs are extremely safe.
Qn: Will consuming more coffee/tea lead to heart attacks?
Ans : No.
Qn: Are asthma patients more prone to heart disease?
Ans : No.
Qn: How would you define junk food?
Ans : Fried food like Kentucky , McDonalds , samosas, and even masala dosas.
Qn: You mentioned that Indians are three times more vulnerable. What is the reason for this, as Europeans and Americans also eat a lot of junk food?
Ans: Every race is vulnerable to some disease and unfortunately, Indians are vulnerable for the most expensive disease.
Qn: Does consuming bananas help reduce hypertension?
Ans : No.
Qn: Can a person help himself during a heart attack (Because we see a lot of forwarded emails on this)?
Ans : Yes. Lie down comfortably and put an aspirin tablet of any description under the tongue and ask someone to take you to the nearest coronary care unit without any delay and do not wait for the ambulance since most of the time, the ambulance does not turn up.
Qn: Do, in any way, low white blood cells and low hemoglobin count lead to heart problems?
Ans : No. But it is ideal to have normal hemoglobin level to increase your exercise capacity.
Qn: Sometimes, due to the hectic schedule we are not able to exercise. So, does walking while doing daily chores at home or climbing the stairs in the house, work as a substitute for exercise?
Ans : Certainly. Avoid sitting continuously for more than half an hour and even the act of getting out of the chair and going to another chair and sitting helps a lot.
Qn: Is there a relation between heart problems and blood sugar?
Ans: Yes. A strong relationship since diabetics are more vulnerable to heart attacks than non-diabetics.
Qn: What are the things one needs to take care of after a heart operation?
Ans : Diet, exercise, drugs on time , Control cholesterol, BP, weight.
Qn: Are people working on night shifts more vulnerable to heart disease when compared to day shift workers?
Ans : No.
Qn: What are the modern anti-hypertensive drugs?
Ans : There are hundreds of drugs and your doctor will chose the right combination for your problem, but my suggestion is to avoid the drugs and go for natural ways of controlling blood pressure by walk, diet to
reduce weight and changing attitudes towards lifestyles.
Qn: Does dispirin or similar headache pills increase the risk of heart attacks?
Ans : No.
Qn: Why is the rate of heart attacks more in men than in women?
Ans : Nature protects women till the age of 45.
Qn: How can one keep the heart in a good condition?
Ans : Eat a healthy diet, avoid junk food, exercise everyday, do not smoke and, go for health checkup s if you are past the age of 30 ( once in six months recommended) ....
A chat with Dr.Devi Shetty, Narayana Hrudayalaya
(Heart Specialist) Bangalore was arranged by WIPRO for its employees .
The transcript of the chat is given below. Useful for everyone.
Qn: What are the thumb rules for a layman to take care of his heart?
Ans:
1. Diet - Less of carbohydrate, more of protein, less oil
2. Exercise - Half an hour's walk, at least five days a week; avoid lifts and avoid sitting for a longtime
3. Quit smoking
4. Control weight
5. Control blood pressure and sugar
Qn: Is eating non-veg food (fish) good for the heart?
Ans: No
Qn: It's still a grave shock to hear that some apparently healthy person
gets a cardiac arrest. How do we understand it in perspective?
Ans: This is called silent attack; that is why we recommend everyone past the age of 30 to undergo routine health checkups.
Qn: Are heart diseases hereditary?
Ans: Yes
Qn: What are the ways in which the heart is stressed? What practices do you suggest to de-stress?
Ans: Change your attitude towards life. Do not look for perfection in everything in life.
Qn: Is walking better than jogging or is more intensive exercise required to keep a healthy heart?
Ans: Walking is better than jogging since jogging leads to early fatigue and injury to joints
Qn: You have done so much for the poor and needy. What has inspired you to do so?
Ans: Mother Theresa , who was my patient
Qn: Can people with low blood pressure suffer heart diseases?
Ans: Extremely rare
Qn: Does cholesterol accumulates right from an early age
(I'm currently only 22) or do you have to worry about it only after you are above 30 years of age?
Ans: Cholesterol accumulates from childhood.
Qn: How do irregular eating habits affect the heart ?
Ans: You tend to eat junk food when the habits are irregular and your body's enzyme release for digestion gets confused.
Qn: How can I control cholesterol content without using medicines?
Ans: Control diet, walk and eat walnut.
Qn: Can yoga prevent heart ailments?
Ans: Yoga helps.
Qn: Which is the best and worst food for the heart?
Ans: Fruits and vegetables are the best and the worst is oil.
Qn: Which oil is better - groundnut, sunflower, olive?
Ans: All oils are bad .
Qn: What is the routine checkup one should go through? Is there any specific test?
Ans: Routine blood test to ensure sugar, cholesterol is ok. Check BP, Treadmill test after an echo.
Qn: What are the first aid steps to be taken on a heart attack?
Ans: Help the person into a sleeping position , place an aspirin tablet under the tongue with a sorbitrate tablet if available, and rush him to a coronary care unit since the maximum casualty takes place within the first hour.
Qn: How do you differentiate between pain caused by a heart attack and that caused due to gastric trouble?
Ans: Extremely difficult without ECG.
Qn: What is the main cause of a steep increase in heart problems amongst youngsters? I see people of about 30-40 yrs of age having heart attacks and serious heart problems.
Ans: Increased awareness has increased incidents. Also, s edentary lifestyles, smoking, junk food, lack of exercise in a country where people are genetically three times more vulnerable for heart attacks than Europeans and Americans.
Qn: Is it possible for a person to have BP outside the normal range of 120/80 and yet be perfectly healthy?
Ans: Yes.
Qn: Marriages within close relatives can lead to heart problems for the child. Is it true?
Ans : Yes, co-sanguinity leads to congenital abnormalities and you may not have a software engineer as a child
Qn: Many of us have an irregular daily routine and many a times we have to stay late nights in office. Does this affect our heart ? What precautions would you recommend?
Ans : When you are young, nature protects you against all these irregularities. However, as you grow older, respect the biological clock.
Qn: Will taking anti-hypertensive drugs cause some other complications (short / long term)?
Ans : Yes, most drugs have some side effects. However, modern anti-hypertensive drugs are extremely safe.
Qn: Will consuming more coffee/tea lead to heart attacks?
Ans : No.
Qn: Are asthma patients more prone to heart disease?
Ans : No.
Qn: How would you define junk food?
Ans : Fried food like Kentucky , McDonalds , samosas, and even masala dosas.
Qn: You mentioned that Indians are three times more vulnerable. What is the reason for this, as Europeans and Americans also eat a lot of junk food?
Ans: Every race is vulnerable to some disease and unfortunately, Indians are vulnerable for the most expensive disease.
Qn: Does consuming bananas help reduce hypertension?
Ans : No.
Qn: Can a person help himself during a heart attack (Because we see a lot of forwarded emails on this)?
Ans : Yes. Lie down comfortably and put an aspirin tablet of any description under the tongue and ask someone to take you to the nearest coronary care unit without any delay and do not wait for the ambulance since most of the time, the ambulance does not turn up.
Qn: Do, in any way, low white blood cells and low hemoglobin count lead to heart problems?
Ans : No. But it is ideal to have normal hemoglobin level to increase your exercise capacity.
Qn: Sometimes, due to the hectic schedule we are not able to exercise. So, does walking while doing daily chores at home or climbing the stairs in the house, work as a substitute for exercise?
Ans : Certainly. Avoid sitting continuously for more than half an hour and even the act of getting out of the chair and going to another chair and sitting helps a lot.
Qn: Is there a relation between heart problems and blood sugar?
Ans: Yes. A strong relationship since diabetics are more vulnerable to heart attacks than non-diabetics.
Qn: What are the things one needs to take care of after a heart operation?
Ans : Diet, exercise, drugs on time , Control cholesterol, BP, weight.
Qn: Are people working on night shifts more vulnerable to heart disease when compared to day shift workers?
Ans : No.
Qn: What are the modern anti-hypertensive drugs?
Ans : There are hundreds of drugs and your doctor will chose the right combination for your problem, but my suggestion is to avoid the drugs and go for natural ways of controlling blood pressure by walk, diet to
reduce weight and changing attitudes towards lifestyles.
Qn: Does dispirin or similar headache pills increase the risk of heart attacks?
Ans : No.
Qn: Why is the rate of heart attacks more in men than in women?
Ans : Nature protects women till the age of 45.
Qn: How can one keep the heart in a good condition?
Ans : Eat a healthy diet, avoid junk food, exercise everyday, do not smoke and, go for health checkup s if you are past the age of 30 ( once in six months recommended) ....
3.5.08
हैल्थ Tools
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Waist Calculator:
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HEalthy Weight Calculator:
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1.5.08
Introduction to Genetics Technology
PCR Amplification
PCR (polymerase chain reaction) amplification is an extremely powerful technique by which a single molecule of DNA can be amplified millions of times in a single afternoon. The technique has enormous applications fields from forensic science, where it can amplify trace DNA samples left at the scene of a crime; to archaeology, where it can show some of the genome of ancient organisms; to modern hospital testing, where the DNA in a tiny blood sample can be used for literally hundreds of genetic tests.
PCR amplification was invented by Kary Mullis in 1983, though something like it was suggested but never tested by Gobind Khorana several years earlier. The technique is incredibly easy to use and adapt. To use PCR, a scientist simply has to take a DNA sample and place it in a solution with the primers (oligonucleotides)that border a part of the sequence the scientist is looking for. Nucleotide bases and copying enzyme are then added to the mix. When this solution is regularly heated and cooled, the "target" DNA sequence is amplified millions of times.
Electrophoresis
Electrophoresis is a method of separating DNA fragments of different lengths. The DNA samples are placed in tiny "wells" at one end of an agarose gel. An electric current is then passed over the gel, separating the fragments. The DNA bands are then revealed with a radioactive probe.
Genetic Fingerprinting
Genetic fingerprinting is a powerful forensic tool used to identify the perpetrator of a crime through traces of genetic material left at the scene. It utilizes repetitions of DNA sequences, which differ from person to person, to uniquely identify an individual. A multi-locus probe searches for multiple repetitions of several different DNA sequences. It is highly individualized, and is one of the best ways to get an unequivocal identification of a person. A single-locus probe searches for repetitions of only one specific sequence. It works with 50 times less genetic material, but is less definitive in its results. Scientists often use three or four single-locus probes to identify individuals, whereas only one multi-locus probe would work.
Gene Splicing
Genes from one organism can be spliced into another using a technique called gene splicing. If a scientist wanted to splice human genes into a bacterial plasmid, he would first cut both DNA fragments with the same restriction enzyme (an enzyme that breaks DNA at certain base sequences, leaving "sticky ends"). He would then take the human gene he wanted to splice into the plasmid and connect them using the "sticky ends" left by the enzymes. He would probably then add strengthening enzymes to strengthen the bond between the DNA fragments. The transgenic bacterium would most likely then be allowed to divide repeatedly, and the resulting bacterial colony would then express the gene.
Other Technologies
Even as these words are read, new technologies in genetics are being developed and tested. Enormous number of discoveries are waiting to happen, and innovations are waiting to be made. Using these and other technologies, humanity will advance into the 21st century knowledgeable about its past, present, and future.
PCR (polymerase chain reaction) amplification is an extremely powerful technique by which a single molecule of DNA can be amplified millions of times in a single afternoon. The technique has enormous applications fields from forensic science, where it can amplify trace DNA samples left at the scene of a crime; to archaeology, where it can show some of the genome of ancient organisms; to modern hospital testing, where the DNA in a tiny blood sample can be used for literally hundreds of genetic tests.
PCR amplification was invented by Kary Mullis in 1983, though something like it was suggested but never tested by Gobind Khorana several years earlier. The technique is incredibly easy to use and adapt. To use PCR, a scientist simply has to take a DNA sample and place it in a solution with the primers (oligonucleotides)that border a part of the sequence the scientist is looking for. Nucleotide bases and copying enzyme are then added to the mix. When this solution is regularly heated and cooled, the "target" DNA sequence is amplified millions of times.
Electrophoresis
Electrophoresis is a method of separating DNA fragments of different lengths. The DNA samples are placed in tiny "wells" at one end of an agarose gel. An electric current is then passed over the gel, separating the fragments. The DNA bands are then revealed with a radioactive probe.
Genetic Fingerprinting
Genetic fingerprinting is a powerful forensic tool used to identify the perpetrator of a crime through traces of genetic material left at the scene. It utilizes repetitions of DNA sequences, which differ from person to person, to uniquely identify an individual. A multi-locus probe searches for multiple repetitions of several different DNA sequences. It is highly individualized, and is one of the best ways to get an unequivocal identification of a person. A single-locus probe searches for repetitions of only one specific sequence. It works with 50 times less genetic material, but is less definitive in its results. Scientists often use three or four single-locus probes to identify individuals, whereas only one multi-locus probe would work.
Gene Splicing
Genes from one organism can be spliced into another using a technique called gene splicing. If a scientist wanted to splice human genes into a bacterial plasmid, he would first cut both DNA fragments with the same restriction enzyme (an enzyme that breaks DNA at certain base sequences, leaving "sticky ends"). He would then take the human gene he wanted to splice into the plasmid and connect them using the "sticky ends" left by the enzymes. He would probably then add strengthening enzymes to strengthen the bond between the DNA fragments. The transgenic bacterium would most likely then be allowed to divide repeatedly, and the resulting bacterial colony would then express the gene.
Other Technologies
Even as these words are read, new technologies in genetics are being developed and tested. Enormous number of discoveries are waiting to happen, and innovations are waiting to be made. Using these and other technologies, humanity will advance into the 21st century knowledgeable about its past, present, and future.
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