Al-Nahrain Journal of Science

The green synthesis method is used to create magnesium oxide (MgO) nanoparticles in this study. SEM measurements and X-ray diffraction techniques are used to determine their crystal structure, as well as, FTIR to analyze the MgO na articles. Green synthesis of MgO nanoparticles are a good adsorbent for Eosin dye in aqueous solutions. Contact time, adsorbent mass, temperature, and Eosin dye concentration were all investigated. Freundlich isotherm models and the Eosin dye isotherm adsorption were well identical. The thermodynamic research yielded 101.4152 J/mol K, 0.02826397 kJ/mol, and -30.7005537 kJ/mol for the ΔS, ΔH and ΔG parameters, respectively. moreover, with R2 = 0.9228, the kinetic investigation revealed that the adsorption was pseudo-second-order.

This research is for academic understanding to work out new ligand behavior 4-({(5-(4-hydroxyphenyl)-3-sulfanyl-1H-1,2,4-triazol-1-yl)amino}(1H -tetrazol-5-yl)methyl)-2-methoxyphenol (L) with gold (III) and nickel (II) metal ions. Ligand (L) has been synthesized from cyclization reaction of (4-hydroxy-3-methoxyphenyl){[5-(4-hydroxyphenyl)-3-sulfanyl-1H-1,2,4-triazol-1-yl]amino}acetonitrile (F) with sodium azide. α-amino nitrile compound (F) intern synthesized from interaction of aldehyde amine and KCN acidic medium as three components one pot reaction. The presence of well oriented donor atoms (N2 - type) of ligand (L) interacted with gold (III) and nickel (II) ions under reflux to prepare [1:2] [M:L]Cl electrolytic complexes, the complexes [Au (L)3]Cl3 and [Ni (L)2]Cl2 were suggested to have square planar geometry. The resulting products were characterized using 1H-NMR, UV-Vis, IR spectroscopy, conductivity and EDX.

Heavy metals can be considered in the aquatic environment as natural archaeological components and their quantities have risen as a result of industrial pollution. Heavy metals do not degrade over time and their concentrations can only rise due to bioaccumulation unlike organic contaminants. In the recent period, fish consumption has increased significantly because of its nutritional benefits, as it is a vital source of protein, as well as being high in critical vitamins and minerals. Because of the presence of heavy metals in frozen fish, it is a global public health issue concern but their presence remains essential and important for human physiological activities. However, when concentrations exceed the established allowed limits, they can be detrimental. The aim of this study was to quantify the concentration of heavy metals in frozen fish samples selected from Baghdad’s local markets. Six samples (Cleaned Shrimps, Anchovy Fillets, Captain Fisher Shrimps, Mackerel Fillets, Super Fresh Kalamar Squid and Frozen Rainbow Trout) of common brands of imported fish were selected from Iraqi markets in Baghdad. Acid digestion with a mixture of (65% HNO3 with 37% HCL) was carried out to free heavy metals from fish samples to prepare solutions for testing in atomic absorption spectroscopy (AAS) device. The results reveal that the element concentrations in the selected samples (Cr, Co, Fe, Cu, Ni, K, Zn and Mg) are within the acceptable levels, and are lower than the permitted exposure limits according to international standards. It is remarkable to mention that the quantities of (Cd and Pb) are lower than permissible exposure limits of cadmium (0.2 mg/Kg) and lead (0.5 mg/Kg), implying that these imported items could be consumed safely.

Nanoparticles (NPs) are used in industrial and biomedical fields such as cosmetics, food additives and biosensors. One of the most important of these particles is magnesium oxide nanoparticles. The nanoparticles of magnesium oxide are diagnosed through several techniques, including the Atomic Force Microscope (AFM) and (XRD). Analyzing the structure of studied nano materials is useful to investigate their medical applications by influencing thyroid hormones such as thyroxine (T4), triiodothyronine (T3), and thyroid-stimulating hormone (TSH) in rat. A total of 15 Sprague-Dawley adult female rats were split into three groups, each group injected daily intraperitoneally of MgONPs at one dose (80 mg/kg). In different periods (14 and 28 days), as follows; The first group: is the control group without injections. The second group: injected intraperitoneally with MgONPs (80 ppm) for 14 days. The third group: was injected intraperitoneally with MgO NPs (80 ppm) for 28 days. The findings of this study revealed a highly significant reduction (p < 0.01) in T3, T4 and Thyroid stimulating hormones (TSH) levels increased high significantly (p < 0.01).

This paper proposes a hybrid method that combines the Kashuri and Fundo integral transform and the Adomian decomposition method to solve two types of Schrödinger equations. The exact solutions are successfully found, and the results are compared with those obtained by the existing methods. The obtained results show the accuracy and efficiency of the method.

This paper, considers the occurring problem of fuzzy project network either in some or whole activities which are interrupted. A probability density function is constructed from the activities of the membership of the fuzzy set. Then an approach is proposed for identifying the longest critical path, by determining in each activity the criticality index depending on the costs yielded from project lateness caused by the interruption activities. A case study is presented and simulated to explain our approach.

In this paper, we shall use the m-structure topological spaces to introduce new concept, which is the -ω-open set. Several facts, results and examples are given to illustrate our work.

Fish species identification process is still problematical and time consuming, so automated fish identification is important. The performance of various fish identification techniques is compared depending on pre-processing, number of significant characteristics and identification correctness. The reason for writing this review stems from the importance of fish for humans as food and as a wealth which support the economy of countries. Therefore, it is necessary to shed light on fish and how to distinguish the beneficial and harmful ones, discover and identify fish diseases, and so on, which contributes in building a knowledge base available to all. The aim of this paper is present a review on various fish species identification techniques; pre-processing operations, features extraction methods, recognition/classification techniques and databases. This review will be helpful for beginner researchers, it can be used as a starting point for new fish species identification approaches.

Background: When oxygen is mentioned, we think of air that we inhale. However, oxygen that is used for medical purposes and treatments should be highly pure
(> 99.5 %). Materials and Methods: Medical oxygen can be used for oxygen therapy, anesthetics, resuscitation, and life support. Using excess oxygen could cause several side effects, including nasal irritation, hypoxic respiratory drive, and pulmonary oxygen toxicity. Results: During the COVID-19 pandemic, while there is an increasing demand for medical oxygen, it can be concluded that a number of health care centers are not equipped to handle oxygen cylinders in a safe way. Also, the household use of oxygen cylinders can be considered as a new risk in terms of the lack of safe use of compressed gases. Conclusion: Several precautions and some case studies are reported in this paper, mainly are the basic recommendations for safe medical oxygen gas handling.