No / Available Online |
Discipline |
Abstracts:
TitleHide Abstracts Autors |
|
---|---|---|---|
23(3) #01 07 Aug 2020 |
Biotechnology | ||
![]() ![]() ![]() |
|||
Despite many studies, the “check points” of metabolic regulation of citric acid (CA) secretion by the yeasts Y.lipolytica still remain unknown. In this manuscript, some possible aspects of strain dependent secretion as well as CA metabolism regulation were discussed. Keys enzymes’ activities, substrate concentration, affinity of the uptake systems, intracellular CA concentration and strains abilities were the main points taken into consideration. The direction for the future studies emerged from this review, mainly connected to cellular and mitochondrial citrate transport systems and cellular substrates transporters (glucose, fructose, glycerol, ethanol and acetate), give promising starting point for future efficient strain development. | |||
23(3) #02 16 Sep 2020 |
Civil Engineering | ||
![]() ![]() ![]() |
|||
Methods of predicting the deposit velocity for wide particle size slurries with maximum particle size up to about 1 mm and maximum d50 size around 0.3 mm are outlined. These slurries generally possess non-Newtonian properties, typically modelled as Bingham plastics, and typically flow pseudo-homogeneously in turbulent flow down to the deposit velocity. Because they flow pseudo-homogeneously, pressure gradient prediction is relatively easy once a suitable operating velocity is selected. Consequently, the deposit velocity is the most important parameter as it determines the operating velocity. | |||
23(3) #03 28 Sep 2020 |
Agricultural Engineering | ||
![]() ![]() ![]() |
|||
Sunflower seeds and oil in food and agricultural processing are of great importance. Dried sunflower petals are the most important parts of the sunflower plant that have economic value. Thin-layer drying experiments were performed in a laboratory scale hot-air dryer. The results indicated that with increasing drying temperature and air velocity, time of drying reduces and in most cases, the logarithmic model had the best performance for modeling the drying kinetics. The calculated values of the effective moisture diffusivity varied from 3.16627 ×10-13 to 1.32860 ×10-12 m2 s-1 and the values of the activation energy for air velocities of 0.4 and 0.8 m s-1 were equal to 51.21 and 42.3 kJ mol-1, respectively. Also, to verify whether the production and sale of sunflower petals can be cost effective, economic analysis was done. This analysis showed that drying of sunflower petals is profitable process and the generated revenue can even surpass the revenue from the sale of sunflower seeds. | |||
Legend: ![]() ![]() ![]() ![]() |