Opis: Biological variation is omnipresent in nature. It contains useful information that is neglected by the usually applied statistical procedures. To extract this information special procedures have to be applied. Biological variation is seen in properties (e.g. size, colour, firmness), but the underlying issue is almost always to the variation in development or maturity in a batch of individuals generated by small scale environmental differences.
The principles of assessing biological variation in batches of individuals are explained without putting emphasis on mathematical details. Obtained explained parts increase from about 60 to 80 % for the usual approach to 95 when the biological variation is taken into account. When technical variation or measuring error is small even 99 % can be achieved. The benefit of the presented technology is highlighted based on a number of already published studies covering the colour of apples during growth and storage and the firmness of cut tomatoes during storage. Ključne besede:biological variation, biological shift factor, mixed effects nonlinear regression, indexed nonlinear regression, colour of apples, firmness of tomatoes Objavljeno v DKUM: 13.07.2017; Ogledov: 817; Prenosov: 354 Celotno besedilo (852,55 KB) Gradivo ima več datotek! Več...

Opis: Interspecific hybridisation within the genus Phaseolus represents an importantsource of genetic variation which can be very useful in breeding programmes based on recurrent selection. The aim of this investigation was to analyse the phenotypic variation and relationships among the most important quantitative traits in F2 generation materials derived from crosses P. vulgaris x P. coccienus. P. vulgaris was used as female while P. coccineus as male parent. The F2 material was composed of 825 individuals which originated from open pollination of 65 F1 plants. The most variable quantitative trait was the number of flowers per inflorescence, which varied from 0 to 57 (CV=45,8 %). The second was the inflorescence length which varied from 2.5 to 74 cm (CV=39,0 %). The highest value (CV=70.4 %) was obtained for floral colour (a qualitative trait which was transformed into a special numerical scale).The correlation analysis showed that there were close relationships among the number of leaves, number of flowers, number of pods, number of seedsand the length of the growth period. For practical breeding, the most useful is probably the correlation between the number of inflorescences and the number of seeds per plant (r=0.503 and 0.560) because the number of inflorescences can be easily determined at the beginning of the hybridisation period, and the number of seeds is more or less directly associated with the yield. For the final visual selection, at the end of the vegetation period, the most useful trait is the number of pods, which is highly correlated with the number of seeds (r=0.740 and 0.916) Ključne besede:interspecific hybrids, Phaseolus vulgaris x P. coccineus, hybridisation technique, phenotypic variation, phenotypic correlation coefficients Objavljeno v DKUM: 10.07.2015; Ogledov: 1018; Prenosov: 34 Povezava na celotno besedilo

Opis: The camera parameters are changed due to temperature variations, which directly influence calibrated cameras accuracy. Robustness of calibration methods were measured and their accuracy was tested. An error ratio due to camera parameters change with respect to total error originated during calibration process was determined. It pointed out that influence of temperature variations decrease by increasing distance of observed objects from cameras. Ključne besede:camera calibration, perspective projection matrix, epipolar geometry, temperature variation Objavljeno v DKUM: 31.05.2012; Ogledov: 1438; Prenosov: 48 Povezava na celotno besedilo