WASHINGTON Antonio Callaway Youth Jersey , Sept. 14 (Xinhua) -- Scientists have created miniature robots out of DNA that can autonomously "walk" around a surface, pick up certain molecules and drop them off in designated locations, a new study published Thursday in the U.S. journal Science said.

"Just like electromechanical robots are sent off to faraway places, like Mars, we would like to send molecular robots to minuscule places where humans can't go, such as the bloodstream," said LuLu Qian, assistant professor of bioengineering of the California Institute of Technology.

Such technology could one day be used for a wide range of applications, including synthesizing therapeutic chemicals in an artificial molecular factory, delivering drugs in bloodstreams or cells, or sorting molecular components in trash for recycling, Qian said.

To create a DNA robot, Qian's team constructed three basic building blocks, including a "leg" with two "feet" for walking, an "arm" and "hand" for picking up cargo, and a segment that can recognize a specific drop-off point and signal to the hand to release its cargo.

Each of these components is made of just a few nucleotides within a single strand of DNA.

In principle, these modular building blocks could be assembled in many different ways to complete different tasks.

For example, a DNA robot with several hands and arms, could be used to carry multiple molecules simultaneously.

In the work described in the Science paper, the Qian group built a robot that could explore a molecular surface, pick up two different molecules and then distribute them to two distinct regions on the surface.

"The DNA robot moves around on a 58-nanometer-by-58-nanometer pegboard on which the pegs are made of single strands of DNA complementary to the robot's leg and foot," Qian's team said in a statement.

"The robot binds to a peg with its leg and one of its feet -- the other foot floats freely," the team said.

"When random molecular fluctuations cause this free foot to encounter a nearby peg, it pulls the robot to the new peg and its other foot is freed. This process continues with the robot moving in a random direction at each step."

Since one step for the little guy takes five minutes, and allows it to move six nanometers, it may take a day for the robot to explore the entire board, the team said.

"Along the way, as the robot encounters cargo molecules tethered to pegs, it grabs them with its 'hand' components and carries them around until it detects the signal of the drop-off point," it said.

"The process is slow, but it allows for a very simple robot design that utilizes very little chemical energy."

In a summary on the robot, the Science magazine called Qian's work "one small step for a DNA robot, one giant leap for mankind.

"The future is here," the summary wrote.

Maria Sharapova, Mandy Moore, Yao Ming, Michelle Obama what do these famous people have in common? Besides the fact that they are, indeed, successful individuals in their fields, they are obviously known for their tall, dignified, yes, heights! No, it doesn t mean that being tall means having it all. It gives a person an aura of confidence, without having to try too hard. If you believe in yourself, the possibilities are endless.

We all know that height growth is best during younger years, while our new cells and young bones are still at their developing stage. This is the perfect opportunity for parents and instructors to help kids grow tall. So how can we help kids grow like these very influential people and give them the confidence they get from being tall? Here are some tips to help kids grow tall:

? Even while the child is at his first months of being, it is very important to monitor everything he takes in. Only breast milk is an advisable liquid to be given to a baby until he is 6 months old. After this period of his life, breast milk may no longer be enough to sustain his needs. As the child grows older and his body gets bigger, his nutritional intake must be increased also. Introduce him to a variety of foods with various colors and textures. The key to help kids grow tall is to provide them with enough amounts that he can consume.

? Though protein and calcium is known to give the direct effect on human size, eating more than enough of them will not help a child grow taller. The daily requirement of protein for a child is from 1 to.5 grams per pound of body weight.

? Encourage the child to get enough sleep that he needs. It is proven that sleep can effectively help kids grow tall. An average of 8 hours per day is recommended. Sleep initiates the production of hormones that help kids grow tall. It is also during sleeping that our spine can rest from the downward pressure caused by our head. Models and athletes sleep at least 8 hours everyday and they even spend a few more hours in the afternoon napping. This is what helps them to grow taller and have a well developed body.

? Inculcate exercise in his daily routines. Let him stretch, run around and just have fun! Remind him that these are important for him and his developing bones. Stretching does really help kids grow tall especially if done regularly. Spine stretching is very common nowadays in exercise routines.

? Encourage your child to engage in sports. Observe which sport he enjoys the most and support him! Sports are another way of introducing exercise and yes, the easiest way to allow him to grow his tallest.

What the children get from all of these is not just a tall physique, but also a sound and healthy body. Helping the child grow taller is helping him live a well balanced and active lifestyle.


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