We studied the precision of densitometric quantification of the protein zones resolved by cellulose acetate electrophoresis. Replicate analyses of patients' samples by a single technologist showed mean CVs ranging from 2.9% for serum albumin to 9.5% for alpha 1-globulin. There were marked differences in measurements obtained by replicate analysis of the same samples by two experienced technolog...

With a goal toward deriving the physical conditions in external galaxies, we present a survey of the formaldehyde emission in a sample of starburst systems. By extending a technique used to derive the spatial density in star formation regions in our own Galaxy, we show how the relative intensity of the 110 − 111 and 211 − 212 K-doublet transitions of H2CO can provide an accurate densitometer fo...

Technologies for the measurement of bone mineral density and other parameters of bone strength at peripheral skeletal sites have been studied since the 1960s. Single-energy Photon Absorptiometry (SPA), Radiographic Absorptiometry (RA), Radiogrametry (RG), Single-energy X-ray Absorptiometry (SXA), Peripheral Dual-energy X-ray Absorptiometry (pDXA), and Quantitative Ultrasonometry (QUS) have been...

densitometry devices. Many studies have shown a strong relationship between bone density at virtually any skeletal site and the subsequent risk for fractures of the spine, hip, and forearm.1 The exact strength of this relationship depends on the type of fracture and the skeletal site measured. In most cases, the relationship between bone density and fracture by analogy is as strong or stronger ...

Bone densitometry (dual energy x-ray absorptiometry-DXA) is a vital medical tool needed for the diagnosis of osteoporosis in non-fractured patients; predicting future fracture risk; and monitoring bone mineral density (BMD) in untreated or treated patients. The history of the pivotal international society involved in the science and clinical interpretation of DXA, the International Society for ...

BACKGROUND To analyze the necessity of bone densitometry for patients long-term taking selective serotonin reuptake inhibitors (SSRI) over a long period of time, which is one of the risk factors of osteoporosis. METHODS We selected patients from 5 veterans hospitals who took SSRI for more than 2 months while taking bone densitometry on a regular basis. RESULTS Of the 85 patients from a tota...

Purpose: Development of an algorithm screening diagnostics osteoporosis with use ultrasonic osteometers based on complex data analysis external instrumental investigations and the anamnesis data. Material methods: The material including researches 53 women aged from 20 up to 75 years, such as results inspection was used: osteometry a calcaneal bone two energy x-ray densitometry lumbar area. Res...

Analytical gel densitometry has become a mainstream technique for quantifying DNA. Unlike other methods such as spectrophotometry and the colorimetric diphenylamine assay, gel analysis provides both qualitative and quantitative assessments of a DNA preparation. A gel picture, for example, provides a wealth of information such as quality of the DNA, and, to a certain extent, the contamination by...

Hadamard transform spatial multiplexing techniques are applied to laser densitometry in order to prevent the photo-induced degradation of sensitive materials. Photochemical and thermal degradations can often occur in point focused scanning laser densitometry. In spatial multiplexing, the excitation source is defocused and efficiently distributed throughout the sample, reducing local power densi...

Electrophoregrams with bands of green chlorophyll-containing protein complexes separated by native polyacrylamide gel electrophoresis (PAGE) are usually photographed in white light or scanned by a narrow beam of monochromatic light using densitometers. Present CCD cameras allow taking densitograms of a whole gel surface with many samples. However, commercial CCD imaging systems use mostly white...