...Hi fffffffff fffffffffff fff fffff fffff fffff fffffffff ffffffffffff fffffffff ffffffffffff ffffffffff fffffffff ffffffffffffffffff Fffffffffffffff ffffff fffffffffffffff ffffffffffffff fffffffffffffff fffffffffffff ffffffffffff ffffffffffffffffff fffffffffffffffffffffff fffffffffff ffffff ffffffffffff fffffffffff fffffffffuuuuu uuuuuuuu uuuuuuuuu uuuuuuuuu uuuuuuuuuu uuuuuuuuuu uuuuuuuuuuu uuuuuuuuuuu uuuuuuuuuuu uuuuiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiittt ttttttttttttttttttt tttttttttttttt tttttttttttttttttttttt tttttttttttttttttttttttttt tttttttttttttttttttttttt ttttttty yyyyyy yyyyyy yyyy yyyyyyyyy yyyyyyy yyyyyy yyy yyyyy yyyyyyyy yyyyyyyy yyyyyyyy yyy yyyyyy yyyyy yyyyyy yyy yyyy Hi fffffffff fffffffffff fff fffff fffff fffff fffffffff ffffffffffff fffffffff ffffffffffff ffffffffff fffffffff ffffffffffffffffff Fffffffffffffff ffffff fffffffffffffff ffffffffffffff fffffffffffffff fffffffffffff ffffffffffff ffffffffffffffffff fffffffffffffffffffffff fffffffffff ffffff ffffffffffff fffffffffff fffffffffuuuuu uuuuuuuu uuuuuuuuu uuuuuuuuu uuuuuuuuuu uuuuuuuuuu uuuuuuuuuuu uuuuuuuuuuu uuuuuuuuuuu uuuuiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiiii iiiiiiiiiiiiiiiiiiiiiiiittt ttttttttttttttttttt tttttttttttttt tttttttttttttttttttttt tttttttttttttttttttttttttt tttttttttttttttttttttttt ttttttty yyyyyy yyyyyy yyyy yyyyyyyyy...
Words: 275 - Pages: 2
...Introduction to graphics and LCD technologies NXP Product Line Microcontrollers Business Line Standard ICs Agenda Passive and active LCD technologies – How LCDs work, STN and TFT differences – How data is converted to colors on the LCD LCD signal interface and timing parameters – LCD signals and timing – Controlling the backlight Introduction to frame buffers with the LPC32x0 MCU – How graphics data is stored in memory – Color depth and lookup tables System considerations for LCD based systems – Mapping LCD data signals to the LCD controller signals – LCD data bandwidth Examples Passive and active LCD technologies How an LCD works An array of Liquid Crystal segments – When not in an electrical field, crystals are organized in a random pattern – When an electric field is applied, the crystals align to the field – The crystals themselves do not emit light, but ‘gate’ the amount of light that can pass through them • Crystals aligned perpendicular to a light source will prevent light from passing through them Each LCD segment is aligned with an electric field A light source (backlight) is needed to drive light through the aligned crystal field Courtesy of Sharp Passive displays Passive LCD panels – Consists of a grid of row and columns electrical signals – Columns and rows connect perpendicularly to every segment in the LCD • Columns and rows are multiplexed to many different segments – An IC controls which column and row are selected...
Words: 2211 - Pages: 9
...PYF12 3/21/05 8:04 PM Page 191 Chapter 12 Gene expression and regulation Bacterial genomes usually contain several thousand different genes. Some of the gene products are required by the cell under all growth conditions and are called housekeeping genes. These include the genes that encode such proteins as DNA polymerase, RNA polymerase, and DNA gyrase. Many other gene products are required under specific growth conditions. These include enzymes that synthesize amino acids, break down specific sugars, or respond to a specific environmental condition such as DNA damage. Housekeeping genes must be expressed at some level all of the time. Frequently, as the cell grows faster, more of the housekeeping gene products are needed. Even under very slow growth, some of each housekeeping gene product is made. The gene products required for specific growth conditions are not needed all of the time. These genes are frequently expressed at extremely low levels, or not expressed at all when they are not needed and yet made when they are needed. This chapter will examine gene regulation or how bacteria regulate the expression of their genes so that the genes that are being expressed meet the needs of the cell for a specific growth condition. Gene regulation can occur at three possible places in the production of an active gene product. First, the transcription of the gene can be regulated. This is known as transcriptional regulation. When the gene is transcribed and how much it is...
Words: 9991 - Pages: 40