Spectrometer calibration and measurements of spectral radiance are often required when performing ground, aerial, and space measurements. While calibrating a spectrometer in the field using an integrating sphere is practically unachievable, calibration against a quartz halogen (QH) lamp is a quite easy and feasible option. We describe a calibration protocol whereby a professional QH lamp, opera...

The immunoreactivity of various LH and FSH calibration standards and recombinant preparations in the enzyme-linked immunoassay (EIA) systems for gonadotrophins developed for the Special Programme of Research in Human Reproduction of the World Health Organization (WHO) were compared. The preparations tested included three LH and two FSH pituitary standards (calibrated against LH 80/552 and 68/40...

A new method for on-line monitoring of fermentations using mid-infrared (MIR) spectroscopy has been developed. The method has been used to predict the concentrations of glucose and ethanol during a baker's yeast fermentations. A completely automated flow system was employed as an interface between the bioprocess under study and the Fourier transform infrared (FT-IR) spectrometer, which was equi...

Results of a national survey on sound field usage and sound field calibration are presented. Respondents to the survey were 418 ASHA certified audiologists, who answered questions on demographic variables, sound field testing conditions, and sound field calibration procedures. Demographic characteristics of the respondents indicate that they were representative of ASHA certified audiologists. E...

APL's entry into research, development, testing, and fabrication of precision time and frequency devices was occasioned by its development of a high-quality, spaceborne oscillator for the Transit navigation satellite program. Later, this effort branched out into atomic frequency standards and other innovative frequency standards such as the super conducting cavity stability oscillator and trapp...

• Synthetic cellulose standards can be successfully used for calibration. Thin layer method is equally good as other methods (for higher concentrations). The accuracy of standardless similar to conc.). addition wax binder improves the precision. best results were obtained 4th period elements Periodic Table. This research explores possibilities and limitations WD-XRF, applied a quantification 20...

Five trials were conducted to develop a system to estimate rumen-undegradable protein (RUP) of legume and grass silages using near infrared reflectance spectroscopy. In situ procedures were the reference method used to determine silage RUP content. Trials 1, 2, and 3 were devoted to improving in situ procedures. In trial 1, alfalfa silage with and without heat treatment was incubated ruminally ...

Five trials were conducted to develop a system to estimate rumen-undegradable protein (RUP) of legume and grass silages using near infrared reflectance spectroscopy. In situ procedures were the reference method used to determine silage RUP content. Trials 1, 2, and 3 were devoted to improving in situ procedures. In trial 1, alfalfa silage with and without heat treatment was incubated ruminally ...

The molecular weight (MW) of heparin can be accurately determined by size exclusion chromatography using "universal calibration." A universal calibration curve was constructed for Superose 12 with standard pullulan samples and verified using characterized ficoll fractions. This calibration yielded the correct MW of heparin as determined by light scattering, when the ionic strength of the mobile...

Mass spectrometry is widely used in flavour research to quantify compounds by using isotopically labelled internal standards. However, equimolar amounts of different molecules do not give equal instrumental responses. Therefore, calibration of the mass spectrometer is needed prior to any sample quantification. If the mass of the internal standard differs from that of the analyte by more than 3 ...