Friday, April 29, 2011

It better know - Telomere DNA Structure

DNA can be defined as a special nucleic acid that contains instructions for the development of the different features and among members of the family of the living organism. Its main function is to store information about the organization. The carrier of genetic information of a person or to another living organism in the hereditary is called genes. In each living body, there are some cells where is DNA and DNA form a helical shape and form chromosomes. The multiplication of these cells can also be called cell division and DNA replication. There are many structures of DNA and one of them is the Quadruplex. In it, there are linear-shaped chromosomes. End of these chromosomes are a very important area called Telomeres. This special Telomere DNA structure essentially protects the end of chromosomes.

It is very important to learn more about Telomeres and it will be easy to understand DNA Telomere structure. Firstly, the Telomeres are still present in parts of the end of chromosomes. It can be defined as a region of recurrent DNA in chromosomes at the end. Its main function is to protect or to occupy chromosomes end points to weaken or damage. Stop this region of end of deprivation or ruin genes. It does short-circuit at the ends of each chromosome is automatic in the replication process. The cell division process, there are enzymes which help to DNA replication. It was found that if cells divide without Telomeres, the tips of chromosomes would degrade and late lose information instructions it contains. Arguably remains at the end of block chromosomes and cell division-divide and gets recharged by enzymes special Telomeres. In this way there are many know the Telomere DNA structure.

There are various changes in the structure of Telomere DNA. There are two types of structures. extended and shortened. Shortening of Telomeres of human beings humans can cause replication, which can stop cell division and may affect the health of the person. While it protects by multiplying the cancer cells to grow, it can affect the immune system in humans and may increase the chances of having cancer. This shrinkage can occur due to aging and poor health. Also shortening can reduce cell division or the duplicity and skip to senescence may remove cancerous cells. Shortening could be corrected by giving long Telomeres. The other DNA Telomere structure is long Telomeres which raises power consumption. causing less energy after all a few hours. It seems not so bad, but it is very difficult to manage. Similarly, if certain conditions long Telomeres are in, while they can be cured by shorter Telomeres. But it the legacy of a person will not protect against cancer.

DNA is one of the smaller parts of our body and shape chromosomes have a very important link with the birth of the child and the genes. These chromosomes are the ends of each strand of chromosome Telomeres. They are very important and useful. They protect and store all information of the genes and take care of the duplicity. Telomere DNA structure may vary, but each change in the structure leads to disease in humans. Some scientists say that some changes may healing and slowing the ageing but has not yet been proven in humans. It is best to know everything about Telomeres arriving at conclusions.

Article Source: http://EzineArticles.com/?expert=Tom_Billmore

Tom Billmore - EzineArticles Expert Author

Wednesday, April 27, 2011

Safety Lab - Tips stay safely in your lab

Following laboratory safety guidelines is very important, not only for your safety, but also for the safety of everyone around you. If its important for professionals, it is certainly no less important when it comes to the classroom setting. Here are simple but very effective tips that you can follow in order to make things safely.

Mercury safety

Avoid thermometers containing mercury at levels because this dangerous substance can have harmful effects for human beings humans as animals.To stay safe and without risk, use alcohol thermometers of mercury thermometers. -If you can use alternatives instead of mercury.Mercury exhaust a bubbler needs be evacuated in a fume hood.Always use a glass, plastic, or steel tray for handling of mercury so that oil spills are contained immediately. Choose a plateau which reacts quite with mercury.Always place a container with mercury inside into a second container backup in case one fails.Do allow mercury to come into contact with hot surfaces that can cause spray.

Graduated cylinders Learn the procedure on how to complete a graduated tube in order to make things as easy as possible. Pour another content for the cylinder really slow to make sure that you put the right amount of chemicals required. As a result of calculating the level of the liquid transferred cylinder graduated by your eye to upgrade. Minor errors of measurements when it comes to laboratories can cause the entire pocedure self-destruct. In addition, always keep a reasonable distance between yourself and the cylinder to avoid accidents because in fact, many people tend to forget this fact. Standing directly above the bottle as it is filled means that harmful fumes can easily be inhaled. However, because you're upgrading eye with potentially harmful liquids, always wear safety glasses in the case where it breaks or spills.

Other rules of general laboratory

Do not eat or drink anything found in the laboratory, because it could be contaminated with something dangerous.Always check the labels carefully to ensure that potentially harmful chemicals do not get mixed or affected.Always wear gloves and safety goggles when working with hazardous materials.Wear clothing that covers the skin so that the legs, arms, and feet are not exposed in the event of a spill. Also, make sure that the clothing is not lost so that it does not get caught in machinery or anything down.Always keep the work area free of things that are not needed for this particular task.Never use your mouth as a tool for aspiration of liquid transfer.After you finish in the lab, wash your hands carefully to prevent food contamination, and skin.This article was viewed (s) 1.
Submitted the: February 10, 2011

Monday, April 25, 2011

Recent technology and devices that have changed the Human Race

How technology has evolved in the past.

Technology is something that makes our world changing in ways that it was not before. Science is not just a job or profession. This is something that we all have deep within us. As we continue on our path of evolution, science begins to change our lives in ways more evolve our capabilities and our capabilities and our goals change. Modern science is changing the world that we live all as it is in our history and soon things begin to change at a pace more rapid. Take into account, it was only a few decades ago that people grew up without a phone without car and computer. When humans have taken science through the reigns and accomplished a lot in a few decades, everyone and everything which has started to change for the better. These moments of life change, these inventions, those of gizmo and gadgets are springboards very that has fueled the science we do today.

He now directs

While we've taken leaps by changes in the last decades ten, but what about the world today and what was happening we take others? Perhaps these inventions are more subtle, now that we are accustomed to a world that is changing rapidly, but they are still very present. Take the recent production of iPhone Apple or the Apple iPad. They were both life changing, so powerful, so that other companies began to follow Apple and he started racing upwards. Now companies are striving to produce the next best copycat or the next best device that competes with Apple products.

How today's technology is still progressing

Now you may be thinking, these inventions are nothing compared to the creation of the car, the telephone and other monumental moments in human history. It may still seem as production slows, or capacities are achieved and we will discover more life changing technology. These thoughts could not be more incorrect. Just take the most recent production, TV flat screen HD 3D now thin pencil and comparing persons aged television produced just years ago. You could make a similar to regular DVD and Blu - Ray disc comparison. It's small adaptations caused by a world in constant evolution in science. They seem not drastic, but once they are stepping stones.

Why it sometimes slows, and how it keeps mobile

Science has already discovered many new things that would completely change the world. However, with a great discovery there are always concerns. What is the biggest in the world today? There is no doubt that there is money. Consider that money has the power to put an invention in stores faster because there is a potential benefit, there is production. Sometimes, you need to take into account that the world is not just prepared for things. The electric car is a good example because although we discovered something great, does not mean that everyone who owns a car is going to rush and buy one. Make consumers to buy something is not as fast as you might think. They will analyze and find that their gas car seems better, drives more strong and is more attractive. Now they are cons important facing electric cars to gas and their cons that developers must address in order to help the world. There are many factors with all products, and it could take developers time to produce better sounding for electric cars engine, but could be the time when customers begin to truly appreciate their beauty. Nobody knows with certainty, but there is no doubt that science is progressing much more that it was even when TV and the telephone was invented. It is at these times decisive in life that we are violating the capabilities we thought that we had and going beyond our beliefs in science. If you intend to travel in space rockets, just imagine the potential we have. We create technology now that someday propel us into space and allow us to reach new planets, new galaxies and I hope that new life. Nobody could ever understand how incredible these discoveries would be. They wouldn't simply change how to pay for our daily lives, they would change our thoughts, our beliefs and what we know.

Saturday, April 23, 2011

Who were the Neanderthals?

The species lost are our possible ancestors are always to be the object of research and debated today. They said he lived as 200,000 years to close as 25,000 years ago in Europe and Southwest Asia. Think they were inhabitants of the cave, this species was physically and culturally adapt the conditions of the ice age.

Almost two centuries, the first fossils of creatures found in Western Europe. Due to the lack of documentation, this wasn't in 1856, when the first remains of a skull and skeleton were found by workers in a cellar deposit small Neander River Valley near D?sseldorf, Germany. They have been recognized as human, but different, like the fact that she had a brow ridged wider and deeper than a man modern with a decline in menton.

Known for having lived in tribes, Neanderthals helped each other to survive. They hunt and eat for sustenance and did not stay in the same place for a long period of time. Experts believe that they were the first humans to bury their dead were also first contact art (cave drawings). Some researchers also believe that we might indeed be an advanced form of Neanderthal due to natural selection results.

To the man of today Neanderthals were larger boned and more heavily muscled. They also have relatively short and squat, and average around 5 feet in height. The brain size was close to that of the average human and even maybe larger.

There is always the question of the where and how the Neanderthals has ceased to exist. Some experts believe that finally the rigorous climatic conditions eliminated the. While others believe that because of the theory of the "jungle" they in turn finally perished attempting to hunt the creatures of massive ice age like the mammoth and saber-toothed Tiger. Up to what we know with certainty the scientists will continue research and discoveries of the missing links and pieces in the past.

Wednesday, April 20, 2011

We are foreign

Many people are fascinated by "out there," life in space. Most of us are extremely curious what would look like aliens and whether they would be similar to us. Some even dared to ask all-time eccentric, "are we alone?". We are therefore at home in our own skin, however, that we forget that we ourselves really live and reproduce within the same "space ' foreigners, do." That makes us by foreigners to stick so any measure.

Obviously, richer reservoir and the only cosmic life that we humans have is here on Earth. I took my son to the aquarium in the city the other day as a fact and was struck by a rather amazing number of things. One is that marine life living in an environment radically different than our terrestrial and show their structures. Of course, they can breathe oxygen even as we do, but they suck it out of the water. It's weird. And for all practical purposes might have their environment drag and pressure, but it is quite lot of weightlessness. Watch squid, Octopus, and rays. If they are no strangers, I do not what are. Slimy, big eyes and foreign serpent in other words. And while the ground is lined by species of the plant Kingdom, there is relatively little plants in the sea. You have the admit it is an exotic environment.

If the land is typical, life is always shroud on a wild ride. The other day I learned that all species of life who have never lived on Earth, more than 97% of those who are switched off. Here life anyway is extraordinarily diverse and dynamic morphing at any time. I would not cover betting, in other words, the super human Earth as we know is going to be around forever. But who knows? Perhaps we'll be the first form of life to throw his body to become pure energy!

This article was written by Dinah Jackson, who likes to write about science, travel, and pokemon. Discover the newest Pokemon online magazine. We have information on Snivy rare Pokemon, Tepig, Oshawott and many other characters. Hundreds of articles from magazine available for free. In addition, tons of upcoming new Pokemon plushie, pokedolls, charms, boosters, figures, deck boxes and thousands more products Pokemon Pokemon du Japan centers.

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Dinah Jackson - EzineArticles Expert AuthorThis article was viewed 61 (s).
Submitted the: February 03, 2011

Monday, April 18, 2011

Who invented the genetic engineering?

If you're wondering who invented genetic engineering, don't be surprised to hear that this controversial area has begun there way long early 1900s by the work of the Austrian monk and scientist named Gregor Mendel. What his work led to was the establishment of genetics as a scientific study area. Since then, many other scientists followed through and made the discoveries.

In 1944, Oswald Avery Colin McLeod and Maclyn McCarty concluded that genetic information may be found in DNA. Since then, the integer scientists began to study DNA and its properties. In 1953, Watson and Crick made a breakthrough when they decoded the DNA structure. It is an important finding because understanding structure allowed for specific DNA modifications.

And then, in the 1960s, Ian Wilmut had begun to develop ways to clone animals from mammalian cells. Restriction enzyme was discovered later in 1968 by microbiologist Switzerland Werner Arber, followed by type II restriction enzyme found in 1969 by American biologist Hamilton Smith.

More research in genetic engineering took place in the 1970s, which put emphasis on bacteria and microorganisms. There, gene isolation and weathering techniques have been developed, allowing scientists to draw a gene from a plant to another. It also found that this could be done with animals, which would create changes to inheritance.

In 1973, a process of cutting DNA and endearing other DNA was developed by Herbert Boyer and Stanley Cohen, which allowed them to make the bacteria reproduce. This was used in the production of insulin. In this decade, scientists were also attempting to slice of genes from other organisms to higher forms. The first of these was the insertion of growth hormone in a mouse in which made the mouse grow twice its size. In 1986, a genetically modified virus was sold to the vaccine. In 1987, a conclusion was made replacement of genes from one organism to another present no danger to the environment.

In the history of genetic engineering is full of controversy and debate. While we will never know how the future is influenced by the possibilities, it is quite remarkable. Things would be different if there is one who invented the genetic engineering.

Saturday, April 16, 2011

Anatomy and Physiology review Questions - How to get an a in your Test

It is essential for anyone entering the field of health who have a basic understanding of Anatomy and physiology. The course is very technical, and there is much information to learn.

I taught Anatomy and Physiology for 6 years and I am very pleased to say that not one of my students does not have their reviews.

I'll go through my method of teaching with you better I can on paper. You can follow this method at home, it is very simple.

I use puzzles and multiple choice questions. The study guide that use has more than a thousand questions is ideal. Each system has its own chapter, so I did not spend time separating questions myself.

Thus, for example, while a single class I covers composition of bone, types of bone and examples. For homework, I give them to complete crosswords. I always photocopy multiple copies of these crosswords for my students can repeat over and over again. Crusaders would obviously relevant to the work that we've covered class.

During the next class I correct Crusaders with them and give them a test on what we've covered the previous week by using multiple-choice questions. I continue this process every week. Once I finish I give my students a large a chapter multiple-choice test. If we have any free time at the end of each class I give them various puzzles to try and finish without the aid of their books.

My students submit their questions to choose multiple tests and crosswords and go on these many times in their studies. Here at the end of the year exams arrived, they have a properly documented review questions and puzzles they have already learned several times.

And that's it! Sounds simple isn't it? It's simple and it really works. Follow this routine at home yourself and you can get that "A" in your test.

Thursday, April 14, 2011

Fuel and energy of the wind, water and Sun

Everyone in this world is aware of the fact that three of the most basic of renewable energy sources are wind, water and sunlight that they are naturally abundant and most importantly, they are found free throughout the planet. Apart from this abundance, we are still not using the best possible way.

We use everyday energy and energy has become one of the most important necessities of our modern everyday life. We use always fossil fuels as our primary source of energy, but, like most of us realize, our world has limited fossil fuel remaining. In the near future the day will come where our world is going to run out of fossil fuels, which took years to create within our Earth's crust.

Fossil as main energy source is not as good for our health and our world. Carbon by fossil fuel combustion are gradually polluting our planet and eventually causing global warming. We are polluting the air we breathe is a major threat to humanity. Thus y an offset this problem? Yes, if we can deploy a method for exploiting alternative energy sources such as wind, sunlight, etc. and start using them in our daily lives so that we can eliminate pollution-producing fossil fuels for every day of our lives!

With the help of renewable energy sources is not new and people used these resources for many years. But the scale necessary to solve the problems of the planet is an obstacle to their implementation. The challenge is to develop a new way to make effective use of our own energy resources. If we want to see them implemented in industry, we need several challenges. They must be economic production, economic of implements and overall increase in operating profits of the company match.

Wind energy can be used for the production of electricity that is collected through the use of large wind turbines. This allows smaller montages and electricity are available even in remote locations where normal distribution networks are perhaps not yet reached. Using such a powerful and readily available energy source could mean much prosperity and growth of small communities remote as well as larger cities and industrial sites.

Hydroelectricity is literally electricity from water is one of the most reliable forms of renewable energy available currently. Energy can be obtained directly from the bed without cause greenhouse effects or global warming. Water electricity is in production to a variety of dams around the world. Only real pollution is in the initial configuration of infrastructure and transport or distribution of power resulting.

Solar energy is another form of energy, which is inexpensive and can be easily used anywhere in the world without much installation costs. Its obvious limitation is, of course, it cannot be used in the light of day, and when the sky is free from clouds.

Two most important factors of consideration of renewable energy sources are their scalability and durability. Renewable energy sources are considered as sustainable if they are naturally abundant and renewable. Scalability to consider whether they can be setup anywhere in the world and whether their power resulting can easily or sustainable distributed to end-users. Barriers is a bad option of renewable energy sources are dealt with quickly and then overcome as the world enters the final phase of its dependence on fossil fuels.

Tuesday, April 12, 2011

Danger extreme level - collapse of atmospheric oxygen

Approximately 60% of the atmospheric high 2010 magnitude the collapse of the thermosphere, cannot be proved explained. The answer is very simple: the thermosphere has become diluted portion of its oxygen for more than 60 years the hijacking of atmospheric oxygen drops in the oceans. The atmosphere, being depleted of oxygen by humanity too high, now energy requirement increased in order to maintain the thermosphere above to it as inflated properly.

And solar low does not help much either...

Here is your 60% for you... Rond point 19 metres of pure oxygen, sea level covering the entire surface of the Earth, oceans was taken down in the oceans, right before the eyes and right under the nose of sixty global Earth and environmental scientists.

No surprise. Since the day in chemistry class, you learn that a chemical equation is balanced only if full. This Professor of chemistry have long forgotten punish you yourself biting into the neck, if you dare to use your claw crab, to write an unbalanced or incomplete, chemical equation.

And yet, very little known.

They have been hammering the Governments and the Public, non-stop carbon dioxide hammer. And they're still hammering each. Never has been one of them resist revolt against all of the "scientific" cackle cage and its contents. Only of them needed to rise to a right of independent thinking and saying: "you are all misled." It work like this: equation full!

Footprint hydrocarbon footprint = carbon + footprint hydrogen.

Monitoring carbon emissions if all what you had for mankind. But stop immediately, without taking into account the full equation.

Announcement again: Stealth imbued with hydrogen, tolerance zero and aggressive atmospheric volume of oxygen remover... Since the first day.

Announcement again: footprint, a patient a bit more, with a lag time of 2 to 4 years, but even stronger atmospheric volume of oxygen remover.

Referring to the collapse of atmospheric oxygen. referring to the intensified radiation, not only CO2 and methane blankets.

Referring additional energy hit 24/7 side surface Earth Day, which is equivalent to the warmth of 3156 tons of coal burned every second.

Referring to 19 metres in less oxygen side height night 24/7, causing radiation reinforced in space of the sea level.

Referring to improvement of vaporization of water of the oceans on the side of the day. referring to improved condensation of water on the side of the night. referring severely disturb atmospheric convection.

Engineer globe.

Sunday, April 10, 2011

Why is a Raven like a desktop?

Honestly, are you able to guess the answer? Maybe you had a laugh now, aren't you? This is Fine really, honestly seems silly. If you have started to look for this specific from the internet, you will find that it's really a particular puzzle. But bear in mind, it seems that contain virtually no solution. People are interested determine solution, however with time they only stir the towel and begin to seek specific debut and also the symbolism connected to this absurd dilemma.
The Cause

This interesting kind of riddle is really widely recognized! You will be able to see on "Alice in Wonderland" is the author of Lewis Carroll. This is the sentence as the Hatter, said the tea party. Hatter said, out of nowhere: "why is a Raven like a desk." He asked Alice if she was perhaps familiar with the correct answer. Alice added that she did immediately after which he describes he knew also. Therefore, this specific puzzle seems fundamentally no response! The end.
Good, but why is a Raven....?

Anyone if we have been pleased with this response (that there is simply no solution to this unique puzzle), some people will always wonder why Carroll wrote this particular riddle? Precisely why it worked with those specified terms, and not many other expressions may have taken advantage of? In addition, this issue doesn't come with a response as well. Single Carroll attempted to clarify what she was really about, but its name appeared just as happens to be provided by everyone. Exactly why "a Raven" and also why "Office"? Essentially the most possible clarification tends to be that this specific puzzle simply fallen on his head, and then he had written it! He was probably thinking about the solution!

People are always willing to solve this problem. It is not really make a difference what Carroll argues in this regard, it must only be a decent clarification. I'm just? To start with, where you will find this specific puzzle, you'll find it seems unacceptable in any way. Can there be an acceptable reason for something so funny? Precisely why most people are still looking for answer? It is perhaps obtained connected with our own persistence. We have often been looking for a particular thing and now we will almost always fascinated with points that we are not able to obtain. This is certainly no doubt.

There is a speech that occur in an effort to solve this unique puzzle. Men and women are informing responses probable, and many of these appear sensitive! On the other hand, we can never really know the particular symbolism. Everything that you can easlily is - always keep questioning! If you consider that you have an excellent solution, post it below! Also, we are also interested in that!

Friday, April 8, 2011

What is a Telomere? Any basic FAQ about it

DNA is present kernel acid in every living organism has stored information which moves from one generation to another. They are present in almost all aspects of our bodies in hair and nails. DNA has a section that stores the information typically known as genes. And millions of DNA from chromosomes are responsible to assist in the creation of life. There is a small point as objects at the end of each chromosome is called Telomeres. Now, the fundamental question that comes to mind is that is a Telomere? Well, it is responsible for stopping the degradation of chromosomes endpoints. It also works with the process of replication and cell division.


There are some very basic things that most people should know but as the concept of Telomeres is a shallow, it becomes very difficult for people to understand. But before read you more about Telomeres, you must know the bases of the DNA and chromosomes. Once you have the knowledge, it will be easy to answer to the question of Telomere. And understand everything about it. There are a few FAQs that are very common on Telomeres.


What is essentially a Telomere? Telomere is a name that is derived from the Greek word Telo means the end and simple which means point. Telomeres are a part in the chromosomes are present at the end of each chromosome strand and part duplications of DNA which stops at the end of the chromosome of degrading.


Two, what transcriptase telomerase reverse? During cell division occurs, divides Telomeres and as each chromosome end should have a defined number of protecting, therefore telomerase is an enzyme that renews the need at the end of the chromosome Telomeres.


Three, which is a Telomere capping? As Telomeres are available at the end of chromosomes and protect endpoint, so general term they call it the chromosomes at the end of styling.


Four, what is the relationship between cell division and Telomeres? As a person or an organization increases with age, there are many cells that divide give us are multi-cellular and at the time of the division, each cell or chromosome Telomeres is divided into 2 parts train or duplicate a chromosome that Telomeres are necessary so that the chromosome new too.


Five years, which is a Telomere structure? Although DNA is helical shape, Telomeres are structure Quadruple and this structure can even be used to protect the DNA ends, and stop repair system in DNA that is sometimes confused with being damaged.


Six, what is meant by Telomere shortening? Telomere shortening is a problem encountered by DNA in replication or duplication. It is called the end replication problem. This problem, cell division slows and may increase cancer cells. This can be corrected by attaching long ends.


Seven, what is meant by Telomere elongation? It is also considered a replication problem as when the Telomere elongation exists, the person or body loses much energy very soon. It can be corrected by adding the Telomere shortening but cancer risk from prevails.


It is important to know the Telomeres and replication of DNA. Information on this subject will help you further study on DNA, its functions, and also various things related to chromosomes. These FAQs answer the most fundamental questions from people. Thus, the question - what is one Telomere can no longer be very confusing. Know and learn what it is.

Wednesday, April 6, 2011

Teaching of Conservation of angular momentum

In this article, I show how easily the problems of physics are resolved using conservation of angular momentum. From only with an explicit declaration of the conservation of angular momentum allows us to solve difficult problems apparently quite easily. As always, I use the problem solutions to demonstrate my approach.

Once again, limited text editor force capabilities I use some unusual rating. This notation is now summarized in one spot, section "teaching dynamic rotation.

Problem. (Not illustrated) sketch shows a boy of mass m standing at the edge of a cylindrical platform of mass M, moment of inertia Ip and RADIUS R = (M. * 2) / 2. The platform is free to rotate without friction around its central axis. The platform is rotating angular speed us when the boy starts edge (e) platform and walk towards the Centre. What is the platform angular velocity when the boy reaches mid-point (m), distance R/2 from the Centre of the platform? What is the angular velocity when it reaches the Centre (c) platform?

Analysis. (a) we consider rotation around the vertical axis through the Centre of the platform. With boy a distance r from the axis of rotation, moment of inertia of the disk in the boy's I = Ip + m. * 2. Since there is no net torque system around the central axis, angular axis is preserved. First, we calculate moment of inertia of the system at three points of interest:

...................................... EDGE...IE = (M. * 2) / 2 + M. * 2 = ((M_+_m_2) R * 2) / 2

...................................... MIDDLE...IM = (M. * 2) / 2 + m (R/2) * 2 = ((M_+_m/2) R * 2) / 2

.......................................CENTRE...CI = (M. * 2) / 2 + m (0) * 2 = (M. * 2) / 2

Equating angular three-point, we have

.................................................Conservation of angular momentum

..........................................................IeWe = ImWm = bridging

...................................((M_+_m_2) R * 2)US / 2 = ((M_+_m/2) R * 2) Wm/2 = (M. * 2) Wc/2.

These latest equations are easily solved for Wm and Wc in terms of we:

.....................................WM = ((M_+_m_2) / (M + m2)) we, Wc = ((M_+_2_m) M) we.

Problem. (Not illustrated) sketch shows a uniform rod (Ir = Ml?/12) of the mass M = 250 g and length l = 120 cm. The stem is free to turn in a horizontal plane a fixed vertical axis from its Centre. Two pearls of small, each mass m = 25 g are free to move in grooves on the stem. Initially, the stem is rotating at angular speed Wi = 10 rad/sec with maintained beads in place on the sides of the Center by latches located opposite d = 10 cm in the axis of rotation. When locks are released, the pearls slide off unto the ends of the stem. What is the angular velocity Wu stem when beads reach the ends of the stem from? (b) suppose beads to join the ends of the stem and are not be stopped, so they slip off the coast of the stem. What, then, is the angular velocity of the stem?

Analysis. The forces on the system are all vertical and exert no torque about the axis of rotation. As a result, the angular momentum about the vertical rotation axis is preserved. our system is the stem (I = (Ml * 2) / 12) and two beads. We have vertical axis

..............................................Conservation of angular momentum

......................................((Rod) L + L (beads)) I = ((rod) L + L (beads)) u

............................((Ml**2)/12 + take * 2)Wi = ((Ml**2)/12 + 2 m (l/2) * 2) Wu

so.................................Wu = (Ml * 2 + 24md * 2) Wi / (Ml * 2 + 6 ml * 2)

With the given values for the different quantities inserted in this last equation, we find that

...........................................................Wu = 6.4 rad/sec.

(b) it is always 6.4 rad/sec. When Pearl slide out sticks, they carry their speed and therefore their angular with them.

Again, we see the advantage of from each physical problem solution consultant is a fundamental principle in this case, the conservation of angular momentum. Two apparently difficult problems are easily solved with this approach.

Dr. William Moebs is physical retired professor who has taught at both universities: Indiana - Purdue Fort Wayne and Loyola Marymount University. You can see hundreds of examples illustrating how stressed the fundamental principles by visiting physical support.

Article Source: http://EzineArticles.com/?expert=William_Moebs

Monday, April 4, 2011

The mystery of time - travel fact or Fiction

Time is one of the strangest questions in the entire universe. Time cannot be controlled, it cannot be cancelled, it cannot be transmitted. But what happens if we could do that. It would be great and wonderful. We could change the past, we could change in the future. We do everything we want. But we ask again "is it really possible? Many modern physics is not denied. In accordance with the rules of physics, it is possible to reverse the time and bend. Time is like a fifth Dimension. It isn't even everywhere in the universe. Some places have gravitational high-level and therefore time passes at a slower pace.

We know that the speed of light is the ultimate force and nothing can be superior to it. As a 189 million kilometres per second. So if we could travel on the speed of light, we could travel through time. But this technology requires improved engines is almost impossible. For example: search for in the night sky and see a star far away. I used to think it was a planet, but I learned more I understood that it was just a star like the Sun. But when I see the star I see what it was until I saw it. You get me?

Suppose that the star is 10 million light-years away, and I see it in the State as it was ten million years before light. I see the current state because light took 10 million years light from reaching my retina. Similarly if someone was on the star or around this star, and if they could see us. They have probably seen a planet dead with no life.

According to Einstein the fabric of space can be bent and a small worm hole can be created. This would enable us to travel long distances and the strange thing is that she could even afford to travel faster than the speed of light. We could then have returned and discovered that our planet has reached year 2988. It may seem like fantasy, but it is possible.

Time travel is essentially the art of mastering physics. As technology evolves and improves and better we one day conquer time and space. Because fiction is the mother of invention.

Saturday, April 2, 2011

Is accurate DNA testing?

The DNA test is one of the identification criteria more specific available today. Thanks to DNA testing, millions of people around the world are able to identify the biological parents, ancestry and many others with a very high degree of certainty. Even though the concept is still relatively new that it has already exceeded other tests of identification with ease due to its high level of precision.

How DNA tests work?

When this genetic testing is performed, a small sample of human tissue is analyzed to identify a single strand of DNA in human tissue cells. Regardless of the type of sample. It may be sperm, hair, skin or any sample that might ultimately be taken of the human body except for bodily waste. DNA sample is then parsed to locate the genetic code sequence or make-up for a particular person. This code is then compared to that of another person to see similarities between distinct or not. In crime scene investigations, strands of DNA samples from crime scenes and suspects are compared to see if there is a link between the two. It is one of the most widely used tests in criminal investigations.

Is accurate DNA testing?

Laboratory DNA tests are very accurate with little margin for error. The reason why it is so specific is because that wire for one person in particular is unique to that person and there is no other like it. There are cases where testing can be falsified or inaccurate due to contamination has occurred. In these cases the results are generally not conclusive.

Are there different types of DNA tests?

There are different types of laboratory DNA for different purposes. Some are used to test biological relationships, others are used for ancestral tests, and some are used strictly for the purpose of identification.

Where can is DNA testing?

Tests can be performed at facilities that are technologically advanced equipment that gives very accurate results. Tests can also be completed from the comfort of your home. This is made possible thanks to DNA test kits which are typically used for biological linking purposes. Paternity and maternity test can be made with home kits, but to get more accurate and reliable results, a test centre should be used if possible.

He never would work?

As with any type of clinical tests, DNA test are also subject to a certain incoherence and marginal error. Inaccurate tests can be caused by a number of factors, with the most probable candidate because of contamination. When DNA samples being contaminated, it sometimes makes impossible to analyse which would not get accurate and successful results.

Why not use a blood test instead of this?

Until recently the blood tests has been the only real solution was available for testing that identifies parents, ancestors, or assist in crime scene investigations. Blood tests, however, are subject to a high level of inaccuracy or error that blood type is not unique to a particular human being. It is possible for many people share the same blood type that produces unique results in testing situations. DNA tests give much more accurate and reliable results.