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New device detects DNA quickly



A new device can quickly detect a DNA molecule. The method involves using a microchannel and a nano-electrode. The microchannel causes DNA strand unwinds and passage through a tiny hole that contains electrodes. The electrodes are separated by a distance of a few nanometers, which is used to differentiate electrically tunnel each base that makes up the DNA chain.

The prototype of the article in question does not have the necessary electronic equipment to identify the bases, but according to the authors it can be done using more sophisticated equipment that have been already demonstrated by other researchers.

The potential impact of this technology is that a DNA sequence can be read so much faster so far, possibly in a matter of seconds, bringing to reality the equipment used in the movie Gattaca .


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Free books on technical drawing



In the engineering profession within the most important documents are the levels of equipment. The design of any new device usually begins in the form of sketches or building plans a prototype or production. Originally done in pencil and ink, were gradually replaced by computerized CAD tools.

Despite the major modernization no longer useful to know the basics of drawing that can be found in old books. In google books free books are about as follows, by Thomas French.

A Manual of Engineering Drawing

Mechanical Drawing for High Schools

newer version of the first manual are still protected by copyright.


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On a mission called Operation Maracati II, the Brazilian space agency launched a sounding rocket VSB-30 (photo). The same was raised to a height of 242 km and managed to stay one capsule for five minutes in microgravity and then be recovered by parachute. The rocket's payload consisted of several microgravity experiments including the solidification of several alloys, the kinetics of enzyme invertase, deposition of carbon nanotube films, heat disipdores satellites, boiling pentane. Other experiments included the effects of high acceleration on a GPS system as well as other educational experiments. More data (in Portuguese) on the website of the agency.

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Brazil launches spacecraft and computers Julian Assange



great discussion in the media on Wikileaks mentioned much to Julian Assange, but said little about his past in the field of computers. In the blog ALT1040 (Number one ranking Wiki) possess excellent note on the history of this character who some consider an elite programmer, author and contributor to numerous open source projects. Over time devoted to journalism and was co-authored a book on the hacker community in the decade of 80 and 90.

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CNC milling machine for less than $ 400? SpaceX



Machining CNC (Computerized Numerical Control) is ideal for inventors and technologists because it can automate the manufacture of mechanical parts of great complexity. One problem is that many hobbyists necessary machines are expensive, but seems to be a downward trend in prices.

An article on O'reilly mentioned a project to build a kit CNC machining (Computer Numerical Control) for under $ 400 U.S.. Kits
like there is a higher price, as this to 600 U.S. dollars.

machines armed and a little more professional include Sherline (1200USD) Taig (2295.00). Non-computer equipment are cheaper, and can be useful for simple pieces.

Moreover, many hobbyists make their own CNC router based on stepper motors and construction materials.

In my experience the more expensive the machine as a whole has the worse the quality in manufacturing, which is critical when one want to build mechanisms or parts that must fit precisely. I think the ideal is that each has its own router hobbyists cheap and use once a year. I think the great revolution would be an easy, quick and cheap to pro-level machines, for example if there are companies that would provide machining services pad on the act within businesses such as Home Depot or similar.

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space capsule into orbit


The private company SpaceX (Partially funded and supported by NASA) towards today's launch and successfully retrieve a space capsule. The project aims at sending supplies and astronauts to the international space station. A

Those interested in this type of I recommend visiting the news page Spaceflightnow . At that site have a section called Mission status center, which chronicle the development of the missions by the minute.

This type of real-time coverage is more exciting when it is a new type of mission as the launch of a new type of vehicle, or fall on Mars, or similar tasks that generate a great suspense.


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criticize NASA article on bacteria and arsenic



In a recent article a reporter interviewed several scientists to know your opinion on a recent NASA u., related to the discovery of bacteria that use arsenic instead of phosphorus.
Several scientists cite flaws in the research. The authors declined to respond to criticism by the press, arguing that any discussion of the topic should be limited to peer-reviewed scientific articles. If
But this attitude has been harshly criticized since the group used mass media to promote his discovery through many parts of the press.





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ecological papers based on animal feces. Medical



In what seems like a joke but it is real, a company called Poopoopaper manufactures paper, notebooks based on elephant feces, cow, horse and giant panda.
The company's products can be purchased in some bookstores and consist of a yellow, fibrous material, which according to the manufacturer is perfectly clean and odor free. Explain that to work it takes advantage of the large number of plant fibers found in the droppings of these various animals.

Other exotic paper products, and presumably ecological, such as paper fibers based on banana, coffee, lemon and mango .


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reinvents integration in 1994 and published scientific article


Apparently
in 1994 a physician scientist published an article on how to calculate the area under a curve, "reinventing" in effect on the trapeze method for the calculation of integrals, which suggests ignorance of the author and the referees of basic calculus concepts well known elsewhere. Some commentators take this case as an extreme example of the lack of interconnection between disciplines and the need for researchers to learn about issues that go beyond their own area of \u200b\u200bexpertise. Link

a note on slashdot. Link to

abstract of the article in question.


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