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مقارنة لبعض نماذج الانحدار المكاني باستخدام المحاكاة 与使用模拟的一些空间回归模型进行比较
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-29 DOI: 10.51173/jt.v5i2.598
Amna Hussein Shawq, Ismail Hadi Globe, Muktar Hussaini
يعّد مرض سرطان الثدي من أكثر الامراض السرطانية شيوعا التي تصيب النساء على مستوى العالم ككل وتختلف معدلات الاصابة بين منطقة واخرى، يمكن دراسة هذه الظاهرة اعتمادا على تأثير المكان بدل السنوات وتتأثر البيانات المكانية بصورة مباشـرة بمجموعـة مـن العوامـل المـؤثرة (العمر، الموقع الجغرافي، الحالة الاجتماعية والاقتصادية والإنجابية، تناول الهرمونات، عوامل الخطر المتعلقة بنمط الحياة (التدخين، النظام الغذائي، السمنة والنشاط البدني)، والتاريخ العائلي التي تساهم بإظهار هذ المرض.في هذا البحث استخدم نماذج الانحدار المكاني  ( spatial regressive model ) لتحليـل البيانـات المكانية لمرض سرطان الثدي ومن  خـلال المقارنة التقدير بين نماذج الانحدار المكاني بواسطة محاكاة مونت كارلو لاختيار افصل مقدر بين النموذجي الانحدار المكاني الاول  نموذج الانحدار الذاتي المكاني (spatial autoregressive mode ) والثاني نموذج الخطأ المكاني( spatial error model)   وتطبيق  طريقتي التقدير طريقة المربعات الصغرى الاعتيادية وطريقة الامكان الاعظم على نماذج الانحدار ولغرض المقارنة استخدام  معيار المقارنة متوسط مربع الخطأ (Mean Square Error) على بيانات ذات عينات ومعلمات مختلفة للتحقق من أداء الطرائق واظهرت النتائج ان طريقة الامكان الاعظم لنموذج الانحدار الذاتي المكاني هي الافضل باختلاف حجم العينة المستعملة وعدد المتغيرات  التوضيحية.
乳腺癌是全世界妇女中最常见的癌症之一,其发病率因地区而异,这一现象可以根据地点而不是年份的影响进行研究,而空间数据直接受到一系列有害因素(年龄、地理位置、社会、经济和生殖状况、荷尔蒙、与生活方式有关的危险因素(吸烟、饮食、肥胖、身体活动)以及家庭病史)的影响。在本研究中,利用空间回归模型分析乳腺癌的空间数据,并通过蒙特卡洛模型对空间回归模型进行估测来选择第一种空间回归模型(空间自回归模型)和第二种空间误差模型(空间误差模型)之间的最佳估计值,以及在回归模型中采用典型的小方方法和更大的可能性方法,以便比较。误差平方图中有不同样品和参数的数据,以验证方法的性能,结果显示,如果使用的样品大小和解释变量的数目不同,更大的空间自回归模型是最好的。
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引用次数: 0
Binary Classification of Customer’s Online Purchasing Behavior Using Machine Learning 基于机器学习的顾客在线购买行为二元分类
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-28 DOI: 10.51173/jt.v5i2.1226
A. Aldelemy, Raed A. Abd-Alhameed
The UK financial sector increasingly employs machine learning techniques to enhance revenue and understand customer behaviour. In this study, we develop a machine learning workflow for high classification accuracy and improved prediction confidence using a binary classification approach on a publicly available dataset from a Portuguese financial institution as a proof of concept. Our methodology includes data analysis, transformation, training, and testing machine learning classifiers such as Naïve Bayes, Decision Trees, Random Forests, Support Vector Machines, Logistic Regression, Artificial Neural Networks, AdaBoost, and Gradient Descent. We use stratified k-folding (k=5) cross-validation and assemble the top-performing classifiers into a decision-making committee, resulting in over 92% accuracy with two-thirds voting confidence. The workflow is simple, adaptable, and suitable for UK banks, demonstrating the potential for practical implementation and data privacy. Future work will extend our approach to UK banks, reformulate the problem as a multi-class classification, and introduce pre-training automated steps for data analysis and transformation.
英国金融部门越来越多地采用机器学习技术来增加收入和理解客户行为。在这项研究中,我们开发了一个机器学习工作流程,用于高分类精度和提高预测置信度,使用二进制分类方法对来自葡萄牙金融机构的公开可用数据集进行分类,作为概念证明。我们的方法包括数据分析、转换、训练和测试机器学习分类器,如Naïve贝叶斯、决策树、随机森林、支持向量机、逻辑回归、人工神经网络、AdaBoost和梯度下降。我们使用分层k-折叠(k=5)交叉验证,并将表现最好的分类器组装到决策委员会中,结果准确率超过92%,投票置信度为三分之二。工作流程简单,适应性强,适合英国银行,展示了实际实施和数据隐私的潜力。未来的工作将把我们的方法扩展到英国银行,将问题重新表述为多类分类,并引入数据分析和转换的预训练自动化步骤。
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引用次数: 0
Application of Overall Equipment Effectiveness for Optimizing Ventilator Reliability in Intensive Care Units and Emergency Departments 综合设备有效性在优化重症监护室和急诊科呼吸机可靠性中的应用
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-28 DOI: 10.51173/jt.v5i2.1419
Khelood A. Mkalaf, Rami Hikmat Al-Hadeethi, Peter Gibson
Healthcare organizations seek to offer a comprehensive medical services system framework with safety and high quality. This needs continuously developing integrated governance systems that provide safe, reliable, and maintaining high-quality care and value-based care for patients. In addition to improving access to health services in time, increasing efficiencies in providing medical services, reducing the risk-based medical services, and selecting a suitable maintenance policy for maintaining the medical devices. This paper adopted a quantitative analysis method based on Reliability-Based Maintenance (RCM) to comprehensively evaluate the overall medical equipment's effectiveness. RCM is an integrated approach to continuous improvement of the maintenance programs because it can predict early medical equipment failure and determine the mean time between failures. It also assesses the risk level to the patient's life in case of a medical equipment breakdown while provisioning medical services. This study targeted biomedical engineering, intensive care units, and emergency departments at 24 public hospitals in a top 20 OECD country. It selected these departments due to the rise in the rate of patients needing ventilator equipment availability during COVID-19, risk based on the sudden breakdown of the ventilator machines, and increasing the annual budget percentage required to provide medical services, where 239 of the ventilator equipment were investigated. Staff Experience-based Evidence was adopted to collect data by interviewing staff and distributing the survey. The study found that the average OEE for ventilator devices in Intensive Care Units and Emergency Departments was 63%. The device's performance was rated at 65%, while its availability and quality rate were both rated at 100%. These findings suggest that the use of the OEE metric has improved ventilator device reliability and performance in selected hospitals. The OEE metric may have potential benefits for improving the performance of other medical devices as well.
医疗机构寻求提供安全、高质量的综合医疗服务体系框架。这需要不断发展综合治理系统,为患者提供安全、可靠和保持高质量的护理和基于价值的护理。此外,还应及时改善获得保健服务的机会,提高提供医疗服务的效率,减少基于风险的医疗服务,并选择适当的维护政策来维护医疗设备。本文采用基于可靠性维护(reliability based Maintenance, RCM)的定量分析方法,对医疗设备的整体有效性进行综合评价。RCM是一种持续改进维护计划的综合方法,因为它可以预测早期医疗设备故障并确定故障之间的平均时间。它还评估在提供医疗服务时医疗设备发生故障对患者生命的风险程度。本研究针对经合组织前20名国家的24家公立医院的生物医学工程、重症监护病房和急诊科。选择这些科室的原因是,COVID-19期间需要呼吸机设备的患者比例上升,呼吸机突然故障带来的风险,以及提供医疗服务所需的年度预算比例增加,其中调查了239台呼吸机设备。采用员工经验证据法,通过对员工进行访谈和发放调查问卷来收集数据。研究发现,重症监护病房和急诊科呼吸机设备的平均OEE为63%。该设备的性能被评为65%,而其可用性和质量率都被评为100%。这些发现表明,在选定的医院中,OEE指标的使用改善了呼吸机装置的可靠性和性能。OEE度量也可能对改善其他医疗设备的性能有潜在的好处。
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引用次数: 0
Evaluation of the Effect of Different Glazing Brands on Surface Roughness of Monolithic Zirconia 不同上光牌号对整体氧化锆表面粗糙度影响的评价
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.940
Riyam Imad Fouad, Lateef Essa, alwan Al Jorani, Abdel Kareem Jasim, Khadim Al-Azzawi
The effect of glazing on the mechanical properties of monolithic high translucent zirconia is widely used to fabricate highly aesthetic and strong dental restorations using CAD-CAM technology. The purpose of this study was to evaluate the surface roughness of different glazing brands' materials on monolithic Zirconia. 40 specimens from Zirconia block (VITA YZ®XT Color, Diameter 98.4x14mm height) were prepared by computer-aided design/computer-aided manufacturing machined (Imes-Icore, 5 axis, COR TEC 250i dry, Germany). The samples dimension for the surface roughness test (diameter 10 mm and thickness 2 mm) by using a surface roughness testing machine profilometer (TR200, Germany), divided into 3 groups depending on types of glazing brands materials (VITA, VITA AKZENT® Plus, glaze LT, Germany), the second group with (Ivoclar Vivadent, IPS e.max Ceram glaze and stain liquid, Liechtenstein), and the third group with (GC Initial spectrum glaze liquid, Austria). The data were analyzed statistically using the package for social science, (ANOVA) test with the Bonferroni test to accept or reject the statistical hypothesis. For the roughness readings, the GC group had the greatest mean value of surface roughness in zirconia (0.721±0.014), followed Ivoclar group (0.663 ± 0.030), and then the VITA group (0.641±0.021). There was a statistically significant difference between (VITA&GC) and (Ivoclar & GC) with a p-value < 0.05, except between VITA with Ivoclar, there was no statistically significant association with a p-value > 0.05 for both. Zirconia glazed with GC paste (powder, fluid) has higher surface roughness than samples glazed with Ivoclar paste (powder, fluid) followed by the VITA group which has lower surface roughness. The results concluded that the monolithic zirconia glazed with GC glaze material displays a higher surface roughness than Ivoclar and VITA glaze.
上釉对整体高半透明氧化锆机械性能的影响被广泛应用于CAD-CAM技术制造高美观和高强度的牙科修复体。采用计算机辅助设计/计算机辅助制造机械加工(Imes-Icore, 5轴,COR TEC 250i dry,德国),制备了40个氧化锆块(VITA YZ®XT Color,直径98.4 × 14mm高)的不同上釉品牌材料表面粗糙度。采用表面粗糙度测试机profilometer (TR200,德国)对样品尺寸进行表面粗糙度测试(直径10毫米,厚度2毫米),根据釉面品牌材料类型分为3组(VITA, VITA AKZENT®Plus,釉料LT,德国),第二组使用(Ivoclar Vivadent, IPS e.max Ceram釉料和染色液,列支敦士登),第三组使用(GC初始光谱釉料液,奥地利)。使用社会科学软件包(ANOVA)检验和Bonferroni检验对数据进行统计分析,以接受或拒绝统计假设。氧化锆表面粗糙度平均值以GC组最高(0.721±0.014),Ivoclar组次之(0.663±0.030),VITA组次之(0.641±0.021)。(VITA&GC)与(Ivoclar &GC)之间差异有统计学意义(p值< 0.05),除VITA与Ivoclar之间差异无统计学意义(p值< 0.05)外,两者之间差异无统计学意义(p值< 0.05)。用GC膏(粉末、流体)釉面的氧化锆表面粗糙度高于用Ivoclar膏(粉末、流体)釉面的样品,其次是VITA组,表面粗糙度较低。结果表明,GC釉料釉面整体氧化锆表面粗糙度高于Ivoclar釉和VITA釉。
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引用次数: 1
Seroprevalence and Biomarkers Detection of Human Herpes Virus (HHV-8) in Patients with Kaposi Sarcoma 人类疱疹病毒(HHV-8)在卡波西肉瘤患者中的血清阳性率和生物标志物检测
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.857
Abdulrazzaq N. Zghair, S. Kasim, Nazar Sh. Mohammed, Anil K Sharma
Kaposi's sarcoma (KS) represents the most prevalent malignancy among untreated HIV-positive individuals. Herpesvirus linked with Kaposi's sarcoma (KSHV; also termed as human herpesvirus 8 (HHV8)). In this study, blood samples were collected from 120 individuals, 60 of them had HHV-8 infection with kaposi sarcoma and 60 persons as apparently healthy control. These patients attended Baghdad Teaching Hospital from the period of 15th February 2021 to 15th January 2022.Infections are seen to be more prevalent in the age group of 25-49 years when compared to other groups. The distribution of the biomarkers confirmed that 50, 25 and 80% of the 20 infected patients were positive for Ca19.9, Ca125 and Ca15.3 respectively. The Ca19.9, Ca125, and Ca15.3 biomarkers all produced good results in patients with Human Herpes Virus 8 (HHV-8) infections, leading us to the conclusion that these biomarkers gave favorable results. All of the PCR products showed a positive amplification at 434bp. Phylogenetic analysis confirmed the belongingness to the HHV strain. Further, this could lead to the development of a novel molecular diagnostic tool.
卡波西氏肉瘤(KS)是未经治疗的hiv阳性个体中最常见的恶性肿瘤。与卡波西肉瘤相关的疱疹病毒;也被称为人类疱疹病毒8 (HHV8))。本研究收集了120人的血液样本,其中60人感染了HHV-8卡波西肉瘤,60人作为表面健康对照。这些病人于2021年2月15日至2022年1月15日在巴格达教学医院就诊。与其他年龄组相比,25-49岁年龄组的感染更为普遍。生物标志物的分布证实,20例感染患者中Ca19.9、Ca125和Ca15.3分别为50%、25%和80%的阳性。Ca19.9、Ca125和Ca15.3生物标志物在人类疱疹病毒8 (HHV-8)感染患者中均产生良好的结果,这使我们得出结论,这些生物标志物具有良好的结果。所有PCR产物均在434bp处呈阳性扩增。系统发育分析证实该病毒属于HHV毒株。此外,这可能会导致一种新的分子诊断工具的发展。
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引用次数: 0
Concentration of Asprosin Associated with Poor Control of Type 2 Diabetes Mellitus in Diyala Province 迪亚拉省2型糖尿病控制不良与Asprosin浓度相关
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.932
Alaa Abed Mahmoud, Walaa Ismael Jassim, Ahmed Abdul Hussein Mohsin, Ahmed M. Senan
A newly secreted adipokine called asprosin is brought on by fasting as well as encourages hepatic glucose release. Its loss of function through immunologic or genetic methods has a significant effect on lowering glucose and insulin as a result of decreased hepatic glucose release. This study aimed to measure the level of asprosin in a group of poor control hyperglycemic patients and compare its level with the control group and find its correlation with obesity and lipid profile. Asprosin level in serum was assessed by enzyme-linked immunosorbent assay (ELISA) technique for 110 Iraqi patients with type 2 diabetes mellitus(T2DM), as well as 70 individual healthy controls. Percentage of glycated hemoglobin (HbAIc), fasting blood glucose (FBG), total cholesterol (TC), triglyceride (TG), high-density lipoprotein (HDL) and low-density lipoprotein (LDL) concentration were calculated using Roche cobas integra 400 plus. Patients with type 2 diabetes mellitus reported increased levels of asprosin in their blood when compared with controls (p < 0.001). A significant positive correlation was seen between asprosin and FBG in patient’s (P< 0.05). Non-significant correlation was seen between asprosin and body mass index (BMI) or lipid profile. In conclusion, according to the asprosin level in serum, there was a highly significant difference between patients with type 2 diabetes mellitus and control group. BMI and lipid abnormalities were not correlated to asprosin level in the serum of patients.
禁食会产生一种新分泌的脂肪因子,叫做阿霉素,同时也会促进肝脏葡萄糖的释放。由于肝脏葡萄糖释放减少,其功能通过免疫或遗传方法丧失,对降低葡萄糖和胰岛素有显著影响。本研究旨在测量一组控制不良的高血糖患者的asprosin水平,并将其与对照组进行比较,发现其与肥胖和血脂的相关性。采用酶联免疫吸附试验(ELISA)技术测定了110例伊拉克2型糖尿病(T2DM)患者及70例健康对照者血清Asprosin水平。采用罗氏cobas integra 400 plus软件计算各组患者糖化血红蛋白(HbAIc)百分比、空腹血糖(FBG)、总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白(HDL)和低密度脂蛋白(LDL)浓度。与对照组相比,2型糖尿病患者报告血液中asprosin水平升高(p < 0.001)。asprosin与FBG呈显著正相关(P< 0.05)。asprosin与身体质量指数(BMI)或血脂无显著相关性。综上所述,根据血清asprosin水平,2型糖尿病患者与对照组之间存在极显著差异。BMI和脂质异常与患者血清asprosin水平无相关性。
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引用次数: 0
Assessment of Risk Factors of Chronic Kidney Disease among Patients Attending Medical City Complex 医疗城综合医院慢性肾脏疾病危险因素评估
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.885
Nabaa Wisam Sabri, Buthaina Ateyah Rashid, Raheem Saber Shwiehk, Azad H. Mahdy
Chronic kidney disease is a worldwide health problem that is defined as structural abnormalities or progressive or permanent loss of renal function for 3 months or more, which is usually associated with a decrease in glomerular filtration rate (GFR) of less than 60 mL/min/1.73 m2 or persistent proteinuria, which can lead to end-stage renal disease (ESRD) or kidney failure. To assess the risk factors leading to chronic kidney disease among the patients between cases and controls in the Medical City Complex. The study was conducted in hospitals of the medical city complex (Baghdad Teaching Hospital, Nursing Home Private Hospital, Ghazy Al-Hariri Hospital for Surgical Specialist, and kidney diseases and Transplant Center) in Baghdad, Iraq, and was designed as a case-control. There were 300 participants (150 cases and 150 controls). Data was collected over five months. The findings show that the highest percentage (20%) was within the age group 50–59 years old in the case study group, with a mean age of patients and controls of 47.71 ± 17.42 and 48.54 ± 17.43 years, respectively, and there were significant sociodemographic risk factors for CKD with gender and residency (p. value < 0.05). There was a significant link between medical history and the outcome of this investigation (p. value < 0.05 and OR > 1) All of the risk factors for CKD were hypertension, acute kidney disease, HCV infection, hyperlipidemia, renal stones, anemia, and cardiovascular disease. alcohol consumption had a significant difference with CKD (p. value =0.004). Increased intake of antihypertensive medical drugs also increases the risk of CKD (p. value =0.000). There is a significant association between patients' gender and residence, the patients with hypertension, AKI, HCV infection, hyperlipidemia, renal stones, anemia, and CVD had a significant relationship with CKD. The risk of CKD is increased in people who have had alcoholism and also in patients who have taken antihypertensive medication, The study recommends educating people about the risk factors of CKD, encouraging them to adopt a healthy diet, and healthy lifestyle, and encouraging alcohol cessation through special programs. The GFR test and other routine clinical tests must be performed regularly to monitor the change in kidney functions.
慢性肾病是一种全球性的健康问题,其定义为结构异常或进行性或永久性肾功能丧失3个月或更长时间,通常伴有肾小球滤过率(GFR)低于60 mL/min/1.73 m2或持续性蛋白尿,可导致终末期肾病(ESRD)或肾衰竭。目的探讨医疗城综合医院病例与对照患者慢性肾脏疾病的危险因素。该研究在伊拉克巴格达的医疗城综合医院(巴格达教学医院、私人疗养院医院、Ghazy Al-Hariri外科专科医院和肾脏疾病和移植中心)进行,并设计为病例对照。共有300名参与者(150例和150例对照)。数据是在五个月内收集的。结果显示,病例研究组中50-59岁年龄组患病率最高(20%),患者和对照组的平均年龄分别为47.71±17.42岁和48.54±17.43岁,性别和居住地存在显著的CKD社会人口学危险因素(p值< 0.05)。病史与调查结果之间存在显著联系(p值< 0.05,OR值> 1)。CKD的所有危险因素为高血压、急性肾病、HCV感染、高脂血症、肾结石、贫血和心血管疾病。饮酒与CKD有显著差异(p值=0.004)。抗高血压药物的摄入量增加也会增加CKD的风险(p值=0.000)。患者性别与居住地有显著相关性,高血压、AKI、HCV感染、高脂血症、肾结石、贫血、CVD患者与CKD有显著相关性。酗酒和服用降压药的患者患慢性肾病的风险增加。该研究建议教育人们了解慢性肾病的危险因素,鼓励他们采用健康的饮食和生活方式,并通过特殊计划鼓励戒酒。必须定期进行GFR试验和其他常规临床试验,以监测肾功能的变化。
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引用次数: 0
Evaluation of Flexure Strength of Heat Cure Acrylic Resin Reinforcement with Nano Al2O3 After Polishing with Different Abrasive Materials 不同磨料抛光后纳米Al2O3热固化丙烯酸树脂增强材料的抗弯强度评价
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.1358
Nihad AlFuraiji, W. Atallah, Syed Saad, B. Qasim
Composites with Nano fillers reinforced by polymer structures are gaining popularity in the field of prosthodontic. Composite materials are being developed to meet the needs of patients, such as heat cure acrylic resins, that used so much in the field of prosthodontic.To evaluate the flexure strength of heat-cure acrylic resin reinforcement with Nano aluminum oxide (Al2O3) after polishing with various abrasive materials.A total of seventy rectangular specimens of heat cure acrylic resin with dimensions (65 mm length x 10 mm diameter x 3 mm thickness) Samples were separated into main seven groups classifications based on the addition of Nano Al2O3 and surface’s polishing with different abrasive materials. Each group have (10) specimens.The highest mean value of flexure strength was obtained in group (B) (87, while the lowest value was obtained in group (F) (56.9).It concluded that the flexure strength was decreased in groups (F and G) of heat-cured resin polished with diamond, while it was increased in groups (B and C) polished with pumice, followed by the control group(A), and then by groups (D and E) that polished with colloidal.
高分子结构增强纳米填料复合材料在口腔修复领域的应用越来越广泛。为了满足患者的需要,正在开发复合材料,如热固化丙烯酸树脂,在修复领域使用得很多。评价纳米氧化铝(Al2O3)热固化丙烯酸树脂增强材料经各种磨料抛光后的抗弯强度。采用尺寸为长65 mm、直径10 mm、厚度3 mm的矩形热固化丙烯酸树脂试样70个,根据纳米Al2O3的添加量和不同磨料对表面的抛光情况,将样品分为7大类。每组有10个标本。挠曲强度平均值(B)组最高(87),平均值(F)组最低(56.9)。结果表明:金刚石抛光热固化树脂的抗折强度降低,浮石抛光热固化树脂的抗折强度升高,浮石抛光热固化树脂的抗折强度升高,其次是对照组(A),胶体抛光热固化树脂的抗折强度升高。
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引用次数: 0
Comparison of IgG and Neutralizing Antibody Response After Pfizer BioNTech COVID-19 Vaccine Among Iraqi Individuals 伊拉克人接种新冠病毒疫苗后IgG和中和抗体反应的比较
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-27 DOI: 10.51173/jt.v5i2.1267
Najat Saeed Hussein, Izzat Abdulsatar Al-Rayahi, Salwa S. Muhsin, Redhwan Abdul Kareem Alameer
SARS-C0V-2 has quickly caused a pandemic. The distribution of vaccines is presently underway in an effort to stop the viral transmission and stop fatalities, several vaccinations have been created to decrease COVID virus disease, in 2019, the development of vaccine-induced population immunity is an important global strategy. Review of the anti-spike protein receptor-binding domain (S-RBD) a person's level of immune response to antibody strategy can be used to assess SARS-CoV-2 viral infection in 2019.  Their efficacy, safety, and immunogenicity in various population are not thoroughly understood. The objective of this study was to evaluate the vaccinations adverse effects as well as determine the immunogenicity of the messenger ribonucleic acid (mRNA) BNT162b2 vaccines through the production of IgG and neutralizing antibodies against the protein s subunit. A total of 41 vaccinated individuals with Pfizer-BioNTech COVID-19 vaccine, as well as (10) non vaccinated were included in the study.   Measurements of Neutralizing antibody (Nab) levels and CoV-IgG levels were tested by fluorescence Immunochromatographic assay. IgG and Nab levels showed a significant difference between its level in the sera of vaccinated and controls (p<0.05). This means the majority of immunization recipients between the ages of 18 -50 years can develop an immunological response to the SARS-Cov-2 vaccine.
SARS-C0V-2迅速引起了大流行。目前正在分发疫苗,以阻止病毒传播和死亡,已经开发了几种疫苗以减少COVID - 19病毒病,2019年,开发疫苗诱导的人群免疫是一项重要的全球战略。回顾抗刺突蛋白受体结合域(S-RBD)一个人对抗体策略的免疫反应水平,可用于评估2019年SARS-CoV-2病毒感染。它们在不同人群中的有效性、安全性和免疫原性尚未完全了解。本研究的目的是通过产生针对mRNA的IgG和中和抗体来评估疫苗接种的不良反应,并确定其免疫原性。共有41名接种了辉瑞- biontech COVID-19疫苗的个体和10名未接种疫苗的个体被纳入研究。采用荧光免疫层析法检测中和抗体(Nab)和冠状病毒igg水平。免疫组与对照组血清IgG和Nab水平差异有统计学意义(p<0.05)。这意味着年龄在18 -50岁之间的大多数免疫接种者可以对SARS-Cov-2疫苗产生免疫反应。
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引用次数: 0
Mechanical Behaviour of Polymer Matrix Composite Reinforced by Silicon Carbide Particles 碳化硅颗粒增强聚合物基复合材料的力学性能
Q4 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-06-26 DOI: 10.51173/jt.v5i2.949
Muna Noori Ismael, Hazim F. Hassan
In various fields, Polymer-based composites are used extensively instead of traditional materials. The hand lay-up technology has been employed to prepare the composites of Silicon carbide particles-epoxy. Mechanical properties; shore D hardness, Flexural strength, tensile strength and impact strength were measured for all specimens. The present work has also studied the impact of different weight percentages (including 3, 6, 9, 12, 15 and 18) wt.% of SiC solid powder on the mechanical properties of fabricated samples with two average particle sizes of 75 and 105 µm. SiC particles were utilized as reinforcement with the epoxy with hardener according to the mixing of (3:1) ratio. The experimental results found that hardness, flexural strength and impact strength can be increased by increasing the weight percentage of Silicon carbide, while tensile strength is decreased with an increased weight fraction of silicon carbide.  At the same time, these properties were enhanced when the particles of SiC have 75 µm more than at 105 µm.
聚合物基复合材料被广泛地应用于各个领域,以取代传统材料。采用手铺技术制备了碳化硅颗粒-环氧树脂复合材料。机械性能;测定了所有试样的邵氏硬度、弯曲强度、拉伸强度和冲击强度。本工作还研究了不同重量百分比(包括3、6、9、12、15和18)wt.%的SiC固体粉末对平均粒径为75和105 μ m的制备样品的力学性能的影响。SiC颗粒与环氧树脂和硬化剂按3:1的比例混合作为增强剂。实验结果表明,增加碳化硅的掺量可以提高材料的硬度、抗弯强度和冲击强度,而随着碳化硅掺量的增加,材料的抗拉强度降低。同时,当SiC颗粒大于75 μ m时,这些性能都得到了增强。
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Journal of Biomolecular Techniques
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