he High Resolution Twin Motor Kit promises electronic application designers resolution precision, greater design flexibility and full holding torque even in power-off mode. Engineers and designers, requiring micro-positioning accuracy and precision, now have the opportunity to build and test applications with resolutions over 2.6 million µpulses per revolution.
The research team lead by Georgia Tech Professor of Biology John McDonald has verified that while the DNA sequence of genes between humans and chimpanzees is nearly identical, there are large genomic "gaps" in areas adjacent to genes that can affect the extent to which genes are "turned on" and "turned off." The research shows that these genomic "gaps" between the two species are predominantly due to the insertion or deletion (INDEL) of viral-like sequences called retrotransposons that are known to comprise about half of the genomes of both species. The findings are reported in the most recent issue of the online, open-access journal Mobile DNA.
"These genetic gaps have primarily been caused by the activity of retroviral-like transposable element sequences," said McDonald. "Transposable elements were once considered 'junk DNA' with little or no function. Now it appears that they may be one of the major reasons why we are so different from chimpanzees."
All the drama in the European Union right now — the debt crisis, the North-South divide and the kvetching over the wisdom of a common currency — has reignited talk about the cultural divide between people on the continent.
But is the divide more than a political and cultural one? Is there a deeper difference among the people of Europe or those of European ancestry than whether Germans have a firmer handshake or are more punctual, or which nationality prefers a kielbasa to köttbulla?
There may be, and those differences can be seen in people’s DNA.
Although all humans are over 99 percent identical genetically, even in the tight geographic confines of Europe there is enough genetic variation that 23andMe researchers can use it to determine from where in Europe a person, or a person’s ancestors, came.
The I2C frequency has to be adjusted – the datasheet says 9600Hz, but I have adjusted it to 11494,253Hz, as it is the same as the one used by the NXT (measured with my logic analyzer). For more information see this pdf, at “Input ports” and “I2C Communication”. Furthermore if you have a look at the Appendix 7-LEGO MINDSTORMS NXT Ultrasonic Sensor I2C communication protocol, it says byte 2 is R + 0×03, this means that the user have to send a repeated start and read from the device straight away. So for example if you want to read the product version. The official Arduino Library (Wire.h) doesn’t support repeated start. So instead I decided to use a modified version of Peter Fleury excellent library: I2Cmaster, as it can be used for any AVR devices. The library is modified to work with the Lego Ultrasonic Sensor (I2C frequency set to 11494,253Hz), and the CPU frequency has been set to the one used by Arduino (16MHz). Keywords has also been added, so the commands will colored orange.
Beginning with the Open Spectrometer, we aim to produce a line of low-cost, high-value scientific instrumentation. Plans for everything will be freely available under open license, and kits and assembled devices will be fairly priced.Hardware Specifications:
Toshiba TCD1304AP- 3648 pixel CCD array
Texas Instruments Stellaris Microcontroller - 9000 series - 80mhz, 96kb RAM, ethernet, USB, microSD, and other hackable buses
Possible Arduino UNO/DUE shield
Reflective grating (configurable based on range/resolution needs)
Option to replace the glass CCD window with Fused Silica for UV operation (>200nm)
In the months since the disasters hit up in the North of Japan a number of innovative movements have sprung up to try and offer assistance and relief to the hardest hit areas. We came across one such project this weekend, the “Ehon Project” (Picture Book Project), a mobile kids picture book library that is bringing smiles and relief to children who lost everything.
Computer scientist Dennis Ritchie is reported to have died at his home this past weekend, after a long battle against an unspecified illness. No further details are available at the time of this blog post.
He was the designer and original developer of the C programming language, and a central figure in the development of Unix. He spent much of his career at Bell Labs. He was awarded the Turing Award in 1983, and the National Medal of Technology in 1999.
"Ritchie's influence rivals Jobs's; it's just less visible," James Grimmelman observed on Twitter. "His pointer has been cast to void *; his process has terminated with exit code 0."