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.
The doctor may advise you to take laxatives if you have medical conditions that may be worsened by straining. These conditions include heart disease, hemorrhoids and hernia rupture. Laxatives are also used to evacuate your bowel before you undergo lower abdominal medical procedures such as colonoscopy. Oral laxatives should be taken one or two hours after meals. Different types of oral laxatives include bulk-forming laxatives, saline laxatives, lubricant laxatives and stimulant laxatives. Oral laxatives should be taken after meals with a full glass of cold water or juice, according to Drugs.com.