ABSTRACT

The current serologic and molecular research work was designated to reassess endemicity of Toxoplasma (T.) gondii which is reckoned a ubiquitous zoonotic protozoan among aborted women, ewes, and does in Erbil, the Kurdistan region of Iraq. To meet the requirements of the survey, 80 aborted women, who attended both Maternity Teaching Hospitals in Erbil and Soran, were examined serologically and molecularly from November, 2021 to Abril, 2022. Moreover, 55 aborted ewes, and 30 aborted does were chosen in afore-mentioned cities at the same period and tested serologically and molecularly as well. The seroprevalence of the parasite demonstrated that 18/80 (22.5%) of aborted women had anti-toxoplasma IgG and the rest were negative. On the other hand, 4/80 (5%) women were harbors of anti-toxoplasma IgM and the rest were negative. Furthermore, the seroprevalence of the parasite demonstrated that 13/55 (23.63%) of aborted ewes had anti-toxoplasma IgG and the rest were negative. On the other hand, 2/55 (3.63%) ewes were harbors of anti-toxoplasma IgM and the rest were negative. Despite that, the seroprevalence of the parasite demonstrated that 8/30 (26.66%) of aborted does had anti-toxoplasma IgG and the rest were negative. On the other hand, 1/30 (3.33%) does were harbors of anti-toxoplasma IgM and the rest were negative. The occurrence of amplification of fragment was 100% of the toxoplasma samples. As well as, the expected patterns were provided in the samples with T. gondii. The result showed that the Toxoplasma species (Women 1, Ewes 2, and Doe 1) was 100% and ewes 12, does 7 were 99.9% homologous to T. gondii under the accession number (KX270387 and MK704513) due to nucleotide substitution (A → G) at the position of 207.

Coronavirus disease-2019 (COVID-19) created a worldwide health problem in late 2019. It was caused by Sever Acute Respiratory Syndrome 2 (SARS-CoV-2), an enveloped RNA virus. The clinical presentation of the disease was found to be variable ranging from mild, moderate to severe. A number of comorbidities such as obesity, diabetes mellitus, organ disorders and age were reported to be associated with morbidity and mortality rates.

The aim of this study was to investigate the association of some laboratory parameters with SARS-CoV-2 infection in Erbil City/Iraq, and to study the circulating Variant of concerns (VOCs) among the infected population through Next Generation Sequencing (NGS) and analysis of the Spike (S) gene.

Throat and nasopharyngeal swabs and blood specimens were collected from suspected cases visited the Central laboratory or admitted to the three COVID-19 specific hospitals in Erbil City/Iraq. The infection was confirmed in 104 patients following RNA extraction and identification by real-time RT- PCR. Then, patients were clinically categorized into mild (n=40), moderate (n=32) and severe (n=32). Blood specimens were also collected from 34 healthy controls. All necessary clinical and demographic information were recorded. Hematological parameters such as lymphocyte count and % and platelet count and other biomarkers (CRP and D-dimer) were measured. Finally, RNA extracts from 15 mild and severe cases were sent to Ankara/Turkey for full S gene sequencing using NGS technique.

Age was significantly associated with COVID-19 (P value= 0.000), in which sever infections were common in extreme ages. No relation was found between ABO, Rh and gender with COVID-19 (P value= 0.41, 0.47 and 0.96

respectively). Death rate was high among sever patients (17(53.1%) as a consequence of multiple comorbidities. Oxygen saturation (SpO2) depressed more significantly in severe and moderate groups than in mild groups. Severe and moderate groups exhibit significantly higher CRP, D-dimer, and lymphocyte% (P<0.05) compared to control group. All the studied biomarkers were significantly higher in non-survivors than in survivors (P<0.001). There was a highly substantial positive correlation between D-dimer and CRP (r= 0.69, P value= 0.000), while a significant negative correlation was observed with other laboratory biomarkers.

The NGS and analysis of the S gene identified two SARS-CoV-2 variants; 13 Delta (B.1.617.2) and 2 Omicron (B.1.1.529). Variants were identified according to the WHO specification of each VOC. On the whole, different mutation classes have been observed including nonsynonymous that constituted the most abundant type of mutation, synonymous, non-frameshift deletions and non-frameshift insertion. L452R, T478K and P681R amino acid variations in spike protein were detected in all Delta isolates and were variant specific. On the other hand, Omicron variants appear with unusual number of mutations (35 mutations). D614G variation was conserved in both variants.

Gender, ABO, and Rh were not associated with COVID-19, but age and a number of comorbidities were significantly associated with disease severity. All studied laboratory biomarkers were associated with mortality. Delta variants showed variations in S gene mutation, whereas both Omicron variants were totally the same. No specific mutations were found to be associated with severity and mortality of COVID-19.

A refrigerator is the most common and efficient method for preserving food and medicine, although its continuous operation consumes a considerable amount of energy. Thus, this study investigated and evaluated the overall performance of a household refrigerator with phase change materials (PCMs) and nanoparticles. The PCMs are applied to the evaporator (evaporator cold storage, ECS) and condenser (condenser heat storage, CHS) individually and simultaneously. Also, a refrigerator with dual energy storage (DES) and combined energy storage (CES) is proposed. The former included CHS and ECS and the latter involved CHS, ECS, and PCM panels in the fridge cabinet. PCMs were organic paraffins, inorganic salt hydrates, and distilled water. The energy consumption of refrigerators is assessed using ISO standards. Isobutane (R600a) was a refrigerant in the system. The experiments included the application of multiple PCMs to the condenser and evaporators. PCM with copper oxide (CuO) nanoparticles is tested on the condenser alone. As a result, through extensive analysis and testing, the overall performance of the refrigerator was optimized. The CHS effectively improved the coefficient of performance (COP) and kept the temperature of the cabinets, while the ECS efficiently saved energy and reduced temperature fluctuation within the cabinets. The most significant optimizations were by DES and CES due to the combination of cons and pros of using PCMs on the condenser, evaporator, and fridge cabinet individually. The energy savings for CHS cases, ECS cases, DES, and CES were 10.87-21.24%, 15.21-23.47%, 24.29%, and 26.42%, respectively. The COP improvements for CHS tests, ECS tests, DES, and CES were 1.58-7.56%, 4.35-5.50%, 8.81%, and 9.10%, respectively. Although their temperatures increased, the fluctuation temperature in the fridge and freezer cabinets dropped by 15.53-56.53% and 0.61-26.46%, respectively.

One of the biggest problems in the world that we live in nowadays is the environmental pollution caused by an overconsumption of energy. When fossil fuels are burned to generate energy, it emits CO₂, which is a leading cause of air pollution. Solar energy has the potential to replace fossil fuels as an alternative source of renewable energy. A photovoltaic solar system is one type of solar system that can convert the sun's light into electrical energy. One of the issues with PV panel is the high temperature of PV cells, especially in summer season when the ambient temperature can rise up to 50℃. As the temperature of solar modules increases, both the output power and the efficiency of PV panel decrease. To improve overall performance while extending the solar module's lifespan, this study proposes lowering photovoltaic cell temperature by using water cooling chamber installed at the back side of the PV panel. The proposed solar panel was developed and designed through both experimental study and ANSYS Fluent simulation. The photovoltaic module that was designed has a water-cooling chamber for the purpose of providing cooling under the condition of Erbil city. The rear side of the photovoltaic panel is cooled using water cooling chamber. The water-cooling chamber can absorb heat dissipation from the photovoltaic panel. The proposed cooling system for the solar panel is a closed cycle, and the cooling water is in contact with the back of the PV panel at different flow rates.  According to experimental setup, the maximum water flow rate of 3.5 l/min gives the optimal heat transfer rate. Finally, results demonstrated an improvement in electrical efficiency by the following percentages: 10.42%, 11.87%, 13.77%, 18.09%, and 19.72% when the water volume flow rates of 1.5, 2, 2.5, 3, and 3.5 l/min, respectively, were applied. Meanwhile, the thermal efficiency of the PV system is 49.7% with a water flow rate of 1.5 l/min. and, the thermal efficiency recorded 79.2% when the system operated at a flow rate of 3.5 l/min.