## Abstract In the context of the Radon approach to tomographic imaging, we face the problem of ascertaining whether or not a set of functions can be considered a set of reliable projections of an unknown function. We first review some results about the singular system of the Radon operator. Then,
Development of protocols for the application of salivary steroid analysis to field conditions
β Scribed by S. F. Lipson; P. T. Ellison
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 598 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1042-0533
No coin nor oath required. For personal study only.
β¦ Synopsis
The simple and noninvasive nature of sample collection for salivary steroid assay makes this technique well suited for anthropological field studies of human reproduction function. In this study, a series of controlled experiments was done to investigate the effects of modifying common clinical sample collection and storage procedures for field use. Matched sets of samples were assayed for four steroids to test the effects of using plastic, rather than glass, collection tubes, of using a stimulant to aid collection, and of storing samples at ambient temperature rather than frozen. Our work confirms the feasibility of collecting samples for salivary steroid assay in field situations, while at the same time emphasizing the importance of considering methodological issues in planning and interpreting such studies. Our results show that it is acceptable to use polystyrene collection tubes and a carefully chosen stimulant to aid collection, and that samples can be stored at ambient temperature in the field when frozen storage is not available. In addition, they demonstrate the necessity for consistency in sample collection and storage procedures.
π SIMILAR VOLUMES
Helically symmetric structures such as helical springs, machine screws and wire rope strands are commonly used structural items. When they are subjected to axial loads (tensile and torsional), these structures may still exhibit the helically symmetric characteristic after loading. If this is the cas
We develop the weighted pairwise correlation approach in several directions: we use a method based on martingale residuals rather than rank residuals; we give a measure of the strength of the linkage and we propose a method for multipoint analysis by combining the weights used in the statistics for