Transfer Standards To briefly review, a frequency calibration compares the device under test (DUT)to a reference. The DUT is usually a quartz, rubidium, or cesium oscillator. Thereference is an oscillator of higher performance than the DUT or a transfer standardthat receives a radio signal.13).Calibration MethodsTo review, frequency standards are normally calibrated by comparing them to atraceable reference frequency. In this section, weâll discuss how this comparison ismade. To begin with, letâs look at the electrical signal produced by a frequencystandard.
Further information: Factitious diarrhea. The most common cause of melanosis coli is the extended use of laxatives, and commonly anthraquinone containing laxatives such as Senna, Aloe Vera and other plant glycosides. The anthranoid laxatives pass through the gastrointestinal tract unabsorbed until they reach the large intestine, where they are changed into their active forms.
Young bark creates severe cramping. Cascara sagrada is a stimulant laxative. It works by causing muscle contractions in the intestines, which moves stool through the bowels. The bark contains chemicals called anthraquinones that give it its color and its laxative effect.These chemicals react with bacteria in the intestines to stimulate the bowels.oung bark creates severe cramping. Cascara sagrada is a stimulant laxative. It works by causing muscle contractions in the intestines, which moves stool through the bowels. The bark contains chemicals called anthraquinones that give it its color and its laxative effect.