Showing 4 results for Sargazi
Hakimeh Sargazi, Hojat Jafarian, Saeed Yelghi, Mohammad Farhangi,
Volume 3, Issue 3 (12-2014)
Abstract
The effect of a probiotic containing five species of bacilli at four levels of 0 (control), 1×106CFU/ml (T1), 1×107 CFU/ml (T 2) and 1×108CFU/ml (T 3) per 100g of feed on the growth performances, resistance and survival of rainbow trout fry, Oncorhynchus mykiss (463±32 mg) were compared in a 60-days feeding trial. Growth parameters, such as ADG, SGR, RGR and TGC, were significantly enhanced (p<0.05) by the probiotic at all levels, and the performance in T2 was significantly better than T1. The fish under the probiotic treatments also showed higher resistance (p<0.05) to such Environmental stresses as alkaline pH, heat and ammonia (p<0.05). No significant difference in tolerance to acidic pH stress was observed between the control and treatments. In conclusion, the probiotic bacillus highly increased the growth performances, feeding efficiency, resistance and survival in rainbow trout fry.
Volume 10, Issue 3 (Summer 2022)
Abstract
Aim: Like many other countries, Iran has been exposed to the COVID-19 pandemic and its different economic and environmental implications. So, the research studies the economic and environmental consequences of COVID-19 in the Makoran coast of Sistan and Baluchistan province that supplies nearly 60% of the demand for fish in Iran.
Materials and Methods: The research is an applied study in terms of goal and a descriptive study in terms of data collection method, which was conducted by the cross-sectional survey method.
Findings: A comparison of the period of January-June 2020 (COVID-19 conditions) versus the similar period in the year 2019 (normal conditions) in the economic sector showed that the fishermen’s income, catch rate, and employment have decreased and their unemployment has increased. In the environmental sector, the pandemic and the related restrictions have increased seawater pollution and waste production.
Conclusion: These changes, which have seemingly increased by the culmination of the COVID-19 pandemic, have had irreparable consequences for the fisheries sector.
Suggestions: Governmental support from the management of demand and supply markets and its plans to support fishermen are recommended as approaches to tackling the crisis. Given the emergence of new strains of COVID-19, such as alpha, beta, gamma, delta, and omicron, it is necessary to conduct long-term studies to determine the full range of the pandemic.
Volume 20, Issue 143 (January 2023)
Abstract
The purpose of this research is to strengthen the antimicrobial properties of active nanofibers containing eucalyptus essential oil by using different concentrations of peppermint essential oil for use as active packaging. Nanofibers containing a mixture of eucalyptus essential oil (10%) and peppermint essential oil (concentrations of 0, 2.5, 5, 10% (v/v)) were produced. SEM and Image-J results showed that the loading of essential oil increased the diameter of electrospun fibers from 200 to 400 nm. SEM images showed that the morphology of electrospun fibers is tubular. XRD was used to study the physical structure of electrospun fibers and XRD diffractograms show that adding essential oil to zein did not change the crystalline structure of zein. TGA thermograms showed that the loading of essential oil increased the thermal stability of electrospun fibers. FTIR spectrum shows the interaction between electrospun fibers and the essential oil. Antibacterial test was done by disc diffusion method and the results showed that the fibrous coating containing essential oil prevented the growth of staphylococcus aureus and escherichia coli. According to the results of this research, fibers containing a mixture of eucalyptus and peppermint essential oils can be considered as an active packaging for use in packaging different food products such as cheese, meat and some other food products.
Volume 27, Issue 1 (Spring 2023)
Abstract
Among the various processes of land degradation, soil erosion is known as a major environmental problem that causes the loss of topsoil and nutrients, reduces fertility, and thus decreases in crop yield. Evaluating and preparing a risk map and estimating the lost economic value due to the loss of soil nutrients can provide the basis for rational planning to prevent and control wind erosion. The aim of this research is to estimate the economic consequences of wind erosion in the Hamoon wetland, which is considered as one of the centers of dust production in the Sistan plain. This research has been done in two stages; first, using the IRIFR model, which is an experimental model to estimate the intensity of wind erosion, an attempt has been made to investigate the erosion intensity, prepare a map of erosion classes (danger), as well as determine the amount of annual sediment production in Hamoon wetland. In the second stage and the economic discussion on the topic, in two parts and using the information obtained from the first stage, using two methods of risk assessment and alternative cost, to prepare a risk map, and the economic value lost due to the loss of the main nutritional elements of the soil action has been taken due to wind erosion in the proposed region. The findings show that Hamoon lagoon has five risk classes in which, the low-risk class has the largest area with 41.15 percent. In terms of economics, from the point of view of the risk map, the largest area of the wetland includes the intensity of risk with 59.93 percent in the very low class, 32.68 percent in the very high class, and 7.36 percent in other classes. The amount of lost economic value of the main soil elements due to wind erosion in the mentioned wetland is estimated to be 994 billion Rials.
