APPLICATION OF PARTICLE-INDUCED X-RAY EMISSION, SCANNING ELECTRON MICROSCOPY AND BACKSCATTERING SPECTROMETRY IN THE ELEMENTAL QUANTIFICATION OF INCREMENTAL PATTERNS IN SCALES OF THE FISH Pomadasys kaakan: A 2-D STUDY
| Autor: | J. Day, J.A. Mars, J. F. Guambe |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | International Journal of PIXE. 22:185-193 |
| ISSN: | 1793-6616 0129-0835 |
| DOI: | 10.1142/s0129083512400165 |
| Popis: | Pollution events are at times difficult to detect because of continuous river flow. Changes in the chemical composition of the water are incorporated into the matrix of fish scales as growth occurs, and, as a result, pollutants in the water may be identified by the analysis of fish scales. The structure of growth patterns on fish scales is characteristically anisotropic. The respective growth patterns appear to be intermittent, convergent, divergent, continuous or discontinuous probably depending on the conditions. Because of anisotropy, fish-scale growth can be described in a mathematical discrete model based on fuzzy terms. The incremental band area was fitted with the saddle-type asymmetric sigmoidal function. There is no significant difference between the composition of keratin in the annuli and the chemical composition of keratin in the circuli. This indicates that there is not acute chemical composition demarcation between the area of the circulus and the incremental band. In the regions of the circuli structure, disruption occurred and the incremental band area is smaller. However, the acute chemical composition demarcation still exists. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|