The independent effects of ferrous and phosphorus on growth and development of Tetraselmis suecica; an in vitro study

Five treatments including Conway medium, media containing 0.1, 0.17, 0.3 and 0.5 mg l-1 ferrous (Fe; in the first experiment), media with 1, 1.26, 1.59, 2 mg l-1 concentrations of phosphorous (P; in the second experiment) and a pure sample of Tetraselmis suecica were cultured under laboratory conditions. Growth rate of the algae was determined using the optical density method at 750 nm and number of algal cells was counted with a hemocytometer. The results of the first experiment showed that the amount of Fe for maximum growth of this species was 0.3 mg l-1, while Fe concentration in Conway medium was 0.27 mg l-1 (P>0.05). The results of second experiment showed that 1.59 mg l-1 P caused the maximum growth of algae which was not significantly different from that of the control medium (with 1.6 mg l-1; Conway; P>0.05).These results showed that due to the lack of significant differences in maximum growth of this alga recorded in 0.3 mg l-1 Fe and that recorded in 1.59 mg l-1 P in Conway medium, increase or decrease of these doses will have a significant negative effect on algal growth

The effect of prebiotic “Immunoster” on growth indices, survival rate, density of blood cells and body composition of Caspian Sea mahi sefid (Rutilus frisii kutum) fingerlings

In order to effect of prebiotic Immunoster was performed the experiment in period of 8 weeks in 0, 2, 4 percent levels on growth, survival, blood cells count and body compositions of mahi sefid fingerlings with initial weight of 0.35±0.02gr. The experiment was performed with use of completely accidental design in one control group and two treatments groups each with 3 replicates and with 150 kutum fingerlings in each tank. Feeding was varied 15-20% of biomass. At the end of experiment, however there was no significant difference in 2 and 4 percent level of Immunoster in camparing with control group (P>0.05), but mahi sefid fingerlings fed by Immunoster containing diet showed slightly better growth function. Survival rate didn’t have significant difference between treatments. The amount of red blood cells (R.B.Cs) and the amount of white blood cells (W.B.Cs) in one cubic millimeter of blood showed significant difference between control and fingerlings fed with 2 and 4 percents levels of Immunoster (P≤0.01). As 2 percent level of Immunoster had highest of R.B.Cs and W.B.Cs in compare with control group. Also there were significant difference between control and experimental groups the view of protein, fiber and carbohydrate of carcass (P≤0.05)

Road-map of aquatic-food processing development of I.R. of IRAN

Scientific and practical planning for achieving the lofty goals of the Islamic Republic of Iran in the framework of development plan of 1404 is the requirement to achieve sustainable development. Establishing roadmap of industries and products was considered by the scientific and technology office of the deputy president, in order to achieve the abovementioned objectives and in line with the national scientific comprehensive map. Therefore, present study was conducted as the roadmap of national aquatic-food processing development using available approved documents e.g. Iran perspective of 1404, fifth developing plan of I.R. of Iran, developing plan of Iranian fisheries organization in 1400 and the available approved statistical data. Current perspective of the aquatic-food processing is presented at the first chapter of the study. The second chapter reviewed the problems and obstacles. Third chapter tabulated the published studies and researches in fish handling and processing so far. Finally fourth chapter recommends executive and research projects considering quantitative and qualitative objectives of Iran 1400 plan as well as fifth developing plan of Shilat-Iran (Iranian fisheries organization). Authors hope the study to be useful in the national planning of I. R. of Iran in the future

Quantitative image analysis for evaluating the abrasion resistance of nanoporous silica films on glass

The abrasion resistance of coated glass surfaces is an important parameter for judging lifetime performance, but practical testing procedures remain overly simplistic and do often not allow for direct conclusions on real-world degradation. Here, we combine quantitative two-dimensional image analysis and mechanical abrasion into a facile tool for probing the abrasion resistance of anti-reflective (AR) coatings. We determine variations in the average coated area, during and after controlled abrasion. Through comparison with other experimental techniques, we show that this method provides a practical, rapid and versatile tool for the evaluation of the abrasion resistance of sol-gel-derived thin films on glass. The method yields informative data, which correlates with measurements of diffuse reflectance and is further supported by qualitative investigations through scanning electron microscopy. In particular, the method directly addresses degradation of coating performance, i.e., the gradual areal loss of antireflective functionality. As an exemplary subject, we studied the abrasion resistance of state-of-the-art nanoporous SiO2 thin films which were derived from 5–6 wt% aqueous solutions of potassium silicates, or from colloidal suspensions of SiO2 nanoparticles. It is shown how abrasion resistance is governed by coating density and film adhesion, defining the trade-off between optimal AR performance and acceptable mechanical performance