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In this short communication we consider the extensibility properties of the cell wall. This is accomplished by a heuristically motivated equation for the expanding volume of the cell. The experimentally determined characteristic time t0 and temperature T0 are the only numbers required for evaluating the effective yielding coefficient Ф(t, T) in the respective time and temperature domains.
The focus of this study is based on the egzamination of the germination traits and the development of thermal models of the medicinal plant Salvia leriifolia Benth. A laboratory experiment was carried out at constant temperatures ranging from 0 to 35°C, at 5°C intervals in a completely randomized design with eight replications. To describe the germination rate response to temperature, three regression models, namely Intersected-Lines (ISL), Quadratic Polynomial (QPN) and Five-Parameters Beta (FPB) were used. The highest Germination Percentage (GP) (92.8%) occurred in 15°C, but GP in the range of 10–25°C was not significant (p≤0.05). The germination process stopped at 0°C and at above 30°C. The results indicated that the highest Germination Rate (GR), the lowest Mean Germination Time (MGT) and also times to 50% germination (D50) were obtained at 20°C. Seeds did not reach to their 50% germination level in temperatures higher than 25°C. The FPB model had the best realistic estimation for cardinal temperatures. Based on models estimation, Base (Tb), Optimum (To) and Ceiling (Tc) temperatures were in the ranges of (1–1.9°C), (18.1–20.8°C) and (34.5–38.7°C), respectively.
Experiment with silage maize was established in 2002. Two hybrids were compared: early hybrid Birko (FAO 210) and middle early hybrid Etendard (FAO 260). Sum of effective temperatures was observed during vegetation period. There was confirmed significant dependence of sum of effective temperatures on dry matter production dynamic of silage maize. Based on study of this indicator is possible to assign optimal term of harvesting for specific hybrid on specific stand. Significant difference of dry matter content of variously matured hybrids is reached at the end of vegetation period.
The proposed here PCR thermal profile improves the specificity and efficiency of PCR using highly degenerate primers, especially in the case of larger PCR products (around 2000 bp and more). The improvement is achieved by the use of a specific annealing temperature in the beginning cycles and the alternate lowering and raising of the annealing temperature in the subsequent cycles.
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