Katzen (performer), and measured in parts per million. In practice, the difference between the signals of common solvents and TMS are known, and since modern instruments are capable of detecting the small quantities of protonated solvent present in commercial deuterated solvents no TMS need be added. By specifying the lock solvent to be used, modern spectrometers are able to correctly reference the sample; in effect, the solvent itself serves as the internal standard. In chromatography, internal standards are used to determine the concentration of other analytes by calculating response factor. The internal standard selected should be again similar to the analyte and 	Internal standard
5333438	have a similar retention time and similar derivitization. It must be stable and must not interfere with the sample components. Internal standard An internal standard in analytical chemistry is a chemical substance that is added in a constant amount to samples, the blank and calibration standards in a chemical analysis. This substance can then be used for calibration by plotting the ratio of the analyte signal to the internal standard signal as a function of the analyte concentration of the standards. This is done to correct for the loss of analyte during sample preparation or sample inlet. The internal standard 	Internal standard
5333439	Katzen (performer) Katzen (performer) Katzen the Tiger Lady is a female performance artist and tattoo artist, whose full body tattoo theme is that of a tiger. (Katzen" is the German word for cats.) Childhood. When Katzen was 5 years old, she kept having dreams of herself covered in tiger stripes. When she was nine and living in Japan, she asked her mother to be tattooed and her mother said "Wait until you're 18." Tattooing. She received extensive tattooing on all parts of her body and wore tiger whiskers attached via piercings on her face. Most of the feline tattooing occurred between  the ages of 18 and 28. More than 227 different tattoo artists have inked her up, including 23 at one time. Katzen removed her plastic whiskers after 14 years of wear because she started to feel that they affected her field of vision. She was at one time married to Paul Lawrence, who performed under the name "The Enigma," with whom she collaborated in a musical show team called "The Human Marvels", and with whom she bore one daughter, Caitlin, who was raised by Katzen's mother. After divorcing, Katzen eventually moved on to have a son, Felix, and marry  another man. That couple has since split. She works at a tattoo shop in Austin, Texas, and as a sideshow performer for the 999 Eyes Freakshow. Katzen (performer) Katzen the Tiger Lady is a female performance artist and tattoo artist, whose full body tattoo theme is that of a tiger. ("Katzen" is the German word for cats.) Childhood. When Katzen was 5 years old, she kept having dreams of herself covered in tiger stripes. When she was nine and living in Japan, she asked her mother to be tattooed and her mother said "Wait until you're 18." Tattooing. She