منابع مشابه
Calibrating the calibrators.
Serial measures of lung function are essential for the long term monitoring of chronic diseases such as chronic obstructive pulmonary disease (COPD) and pulmonary fibrosis where the main aim is to limit disease progression. Measures of forced expiratory volume in one second (FEVI) and forced vital capacity (FVC) are generally the most reproducible and therefore suitable for long term disease mo...
متن کاملCalibrating the microStar
Before you begin making measurements the microStar should be calibrated to your specific environment. This process, (i.e. creating a calibration curve) is extremely important as it correlates the optical response from a dosimeter to a known dose in order to establish the sensitivity of the system (measured in counts/dose). Fortunately, this is simple to do and the results can be stored for late...
متن کاملCalibrating the mitochondrial clock.
Some of the DNA from the tsar's mitochondria--cellular organelles with their own DNA--didn't quite match that of his living relatives. Forensic experts thought that most people carry only one type of mitochondrial DNA(mtDNA), but the tsar had two: The same site sometimes contained a cytosine and sometimes a thymine. His relatives had only thymine, a mismatch that fueled controversy over the aut...
متن کاملCalibrating the Cryogenian.
The Neoproterozoic was an era of great environmental and biological change, but a paucity of direct and precise age constraints on strata from this time has prevented the complete integration of these records. We present four high-precision U-Pb ages for Neoproterozoic rocks in northwestern Canada that constrain large perturbations in the carbon cycle, a major diversification and depletion in t...
متن کاملCalibrating the mental number line.
Human adults are thought to possess two dissociable systems to represent numbers: an approximate quantity system akin to a mental number line, and a verbal system capable of representing numbers exactly. Here, we study the interface between these two systems using an estimation task. Observers were asked to estimate the approximate numerosity of dot arrays. We show that, in the absence of calib...
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ژورنال
عنوان ژورنال: Microscopy Today
سال: 1997
ISSN: 1551-9295,2150-3583
DOI: 10.1017/s1551929500060569