I simple use good and bad bacteria to refer to all bacteria that exist in small intestine and your colon.

Your colon has both good and bad bacteria. The good bacteria maintain health of your colon by keeping bad bacteria from multiplying and reducing constipation.

Most people have bad bacteria as dominant condition in their colon. You can see this by illnesses that exist throughout world. Most people later in their life suffer from diseases that resulted from colon neglect and abuse.

Bad bacteria multiples when you,

* Consume poisons such as pollution, pesticides, food additives such as preservatives, coloring, so on.

* Drink alcohol

* Eat processed foods

* Have excess anxiety

* Lack fiber in your diet

* Use birth control pills

* Use drugstore laxative

* Use drugs and medication

Good bacteria in your colon consists of hundred of species of bacteria. The good bacteria are most active in a pH of 5.9 to 6.9- an acidic environment. This makes for a healthy colon.

Your colon serves as a home for good bacteria, which ferment specific carbohydrates, which in turn keep your colon environment slightly acidic. The acid environment favors good bacteria and keeps bad bacteria and pathogens from multiplying.

The bad bacteria create an alkaline environment and are most active in a pH of 7.1 to 7.9

Again, good bacteria creates an acidic environment and are most active in a pH of 5.9 to 6.9

Acidophilus and Bifidus are main good bacteria that exist in your colon. The ascending colon, on right side of your abdomen area, has most bacteria. The quantity of bacteria becomes less in transverse colon and lesser in descending colon. Eventually, little bacteria is found in sigmoid and rectum.

When good beneficial bacteria is dominant, in your colon, it prevents spread of disease from various organisms – parasites, bacteria, viruses, fungi. The specific organisms

Rather than making pictures of brain's anatomy, EEGs evaluate brain's physiology. So while imaging tests won't replace electroencephalograms, EEGs won't replace imaging tests, either. The testing methods look at brain from completely different points of view, each valuable in its own way.

Broken into its parts, term electroencephalogram means "electrical brain recording."

Hans Berger, a German scientist, got ball rolling in 1924 with first recordings of human brain-waves. Since then, basic principles of recording EEGs have remained same, but electronics have gotten better—and smaller. In an EEG recording, tiny voltage-fluctuations from brain are picked up by a standard array of metal disks attached to scalp and are then amplified electronically in order to create a permanent recording.

If you are old enough, you might remember 1960s fascination with alpha waves which people tried to enhance via biofeedback devices. Alpha waves are rhythmic brain-signals oscillating between 8 and 13 times per second that can be measured from back of head during quiet wakefulness.

Additional voltage-rhythms encountered during clinical recordings include theta and delta waves that oscillate more slowly than alpha waves, and beta waves that oscillate more rapidly. All four rhythms can be seen in normal states of alertness, drowsiness or sleep, and should be same on both sides of brain.

The premier use of EEGs is to evaluate people with known or suspected epilepsy (seizure disorders). Seizures are highly electrical events in brain that cause temporary alterations in patient's consciousness, perceptions or behavior.

In healthy circumstances, brain's approximately 20 billion brain cells perpetually signal each other via electrical impulses. Collectively, these impulses traveling among networks of brain-cells are means by which brain performs its functions—like perceiving, pondering, remembering, calculating and deciding. A poetic scientist described brain and its normal functioning as "an enchanted loom where millions of flashing shuttles weave a dissolving pattern, always a meaningful pattern though never an abiding one; a shifting harmony of subpatterns."

But in epileptic attacks, salvo upon salvo of excessive discharges overwhelm brain's circuits and disrupt their normal functions. Suddenly, enchanted loom's patterns are no longer meaningful or harmonious.