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Characterization of Radiation Prepared Copolymer and Studies of Their Biodegradability

Journal of Biosciences and Medicines 2018年第2期6卷 33-56页

作者： nabila ahmed maziad Amany Badr El-Deen Abd El-Aziz Sabrnal El-Hamouly Maher Abd El-Aziz Mahmoud El-Hashish Sameh A. Rizk Nada Rabie Nasef Department of Polymer Chemistry National Centre for Radiation Research and Technology Atomic Energy Authority Nasr City Egypt Microbiology Department National Centre for Radiation Research and Technology Atomic Energy Authority Nasr City Egypt Department Polymer Chemistry Faculty of Science Manoufia University Al Minufya Egypt Department Organic Chemistry Faculty of Science Ain Shams University Cairo Egypt

Blends of biodegradable copolymer based on starch, poly lactic acid (PLA), poly vinyl alcohol (PVA) and natural rubber (NR) have been prepared. Gamma radiation induced synthesis and modification of polymer hydrogel was studied. The polymer blends have been chemically surface modified by glycerol. The modified polymer blends have been investigated for swelling ratio, tensile strength and 9 scanning electron microscopy. The swelling ratio of polymer blends increased significantly after surface modification with glycerol. The swelling of polymer was decreased as a function of (NR) content in polymer blends. The gel fraction (PVA-starch-PLA) and (PVA-starch-NR) blends increased by increasing the radiation doses (kGy) to reach the maximum amount of (~99%) and (~88.2%), respectively. Addition of 2.5% (PLA) led to greater increase of the swelling ratio than 10% (NR) to blends and the maximum swelling was found at dose (5 kGy). At concentration of glycerol (5.0% w/w), tensile strength decreased and elongation at break % increased. The polymers degrading microorganisms were isolated from soil samples. The degradation ability of the microbial isolates for each polymeric material was tested on agar plates. Among these isolates, the most efficient degrader isolates for prepared blends in MSM shaking flasks were selected and the degradation was confirmed by scanning electron microscopy.

关键词： Radiation Biodegradation (NR) (PLA) Renewable Resources Mechanical Properties Scanning Electron Microscopy

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Competitive Contribution of Catalyst and Adsorption Roles of TiO_2 on the Degradation of AO7 Dye During Plasma Treatment

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Plasma Science and Technology 2013年第9期15卷 915-922页

作者： nabila HADDOU Moufok Redounae GHEZZAR Fatiha ABDELMALEK Stephanie OGNIER ahmed ADDOU Laboratory of Science and Technical Environment and Valorization University of Mostaganem Laboratory of Process Engineering and Surface Treatment National School of ChemistryUniversity of Pierre and Marie Curie

In order to investigate the role of TiO2 during plasma treatment, the degradation of the dye AO7 has been studied by gliding arc discharge in the presence of a TiO2 catalyst （CGAD）. The results revealed that the adsorption of the dye on TiO2 is a physical adsorption in accordance with Langmuir isotherm, with a constant of adsorption KL ： 0.52 mg/L and a maximum adsorption capacity b = 18.1 mg/g. The temperature variation of the reaction medium made it possible to consider thermodynamic parameters. Indeed, the adsorption is exothermic （enthalpy： △H 〈 0）, and spontaneous （free enthalpy： △G 〈 0）. The negative entropy （△S 〈 0） confirms the affinity of the dye molecules for TiO2. 20 min of CGAD treatment in the pres- ence of an optimal quantity of TiO2 （2 g/L enabled us to bleach the solution of AO7 （100 μM） completely. The discoloration rate with and without the addition of TiO2 was 100% and 28%, respectively. 40 additional minutes of treatment allowed a total abatement of the chemical oxy- gen demand. The elimination of AO7 molecules during the plasma-catalytic treatment follows Langmuir-Hinshelwood （L-H） model kinetics. According to this model, the speed constant is kr = 14.97 mg-L-1 ·min-1 and the adsorption coefficient is KL-H= 0.010 L/mg. The latter being negligible compared to kr, adsorption is therefore weakly performed during the plasma treatment.

关键词： adsorption catalysis AO7 gliding arc discharge TiO_2 degradation

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Predictors of thirty-day readmission in nonagenarians presenting with acute heart failure with preserved ejection fraction: a nationwide analysis

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Journal of Geriatric Cardiology 2021年第12期18卷 1008-1018页

作者： ahmed Maraey Mahmoud Salem nabila Dawoud Mahmoud Khalil ahmed Elzanaty Hadeer Elsharnoby ahmed Younes ahmed Hashim Amit Alam Department of Internal Medicine the CHI St.Alexius HealthBismarckUSA Department of Internal Medicine University of North DakotaBismarckUSA Center for Advanced Heart and Lung Diseases Baylor University Medical CenterDallasUSA Department of Internal Medicine University of KentuckyLexingtonUSA Department of Internal Medicine Lincoln Medical Center Weil Cornell UniversityBronxUSA Department of Cardiovascular Medicine Tanta UniversityTantaEgypt Department of Cardiovascular Disease University of ToledoToledoUSA Faculty of Medicine Tanta UniversityTantaEgypt Department of Internal Medicine East Carolina UniversityGreenvilleUSA Faculty of Medicine Ain Shams UniversityCairoEgypt College of Medicine Texas A&M Health Science CenterDallasUSA

BACKGROUD Acute heart failure with preserved ejection fraction(HFpEF)is a common but poorly studied cause of hospital admissions among *** study aimed to evaluate predictors of thirty-day readmission,in-hospital mortality,length of stay,and hospital charges in nonagenarians hospitalized with acute *** Patients hospitalized between January 2016 and December 2018 with a primary diagnosis of diastolic heart failure were identified using ICD-10 within the Nationwide Readmission *** excluded patients who died in index admission,and discharged in December each year to allow thirty-day *** regression was performed on each ***-ables with P-value<0.2 were included in the multivariate regression *** From a total of 45,393 index admissions,43,646 patients(96.2%)survived to discharge.A total of 7,437 patients(15.6%)had a thirty-day *** cost of readmission was 43,265 United States dollars(USD)per *** predictors of thirty-day readmission were chronic kidney disease stage III or higher[adjusted odds ratio(aOR)=1.20,95%CI:1.07−1.34,P=0.002]and diabetes mellitus(aOR=1.18,95%CI:1.07−1.29,P=0.001).Meanwhile,female(aOR=0.90,95%CI:0.82−0.99,P=0.028)and palliative care encounter(aOR=0.27,95%CI:0.21−0.34,P<0.001)were associated with lower odds of *** arrhythmia(aOR=1.46,95%CI:1.11−1.93,P=0.007)and aortic stenosis(aOR=1.36,95%CI:1.05−1.76,P=0.020)were amongst predictors of in-hospital *** In nonagenarians hospitalized with acute HFpEF,thirty-day readmission is common and *** co-morbidities predict poor *** strategies need to be developed to improve the quality of care and prevent the poor outcome in nonagenarians.

关键词： fraction nationwide dollar

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COVID-19 and liver diseases,what we know so far

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World Journal of Clinical Cases 2022年第13期10卷 3969-3980页

作者： Mohamed Elnaggar ahmed Abomhya Ismail Elkhattib nabila Dawoud Rajkumar Doshi Department of Internal Medicine University of Nevada Reno School of MedicineRenoNV 89052United States Department of Internal Medicine The Brooklyn Hospital CenterBrooklynNY 11200United States Department of Internal Medicine University of ConnecticutFarmingtonCT 06030United States Department of Internal Medicine University of KentuckyLexingtonKY 40508United States Department of Cardiology St Joseph's University Medical CenterPatersonNJ 07503United States

Coronavirus disease 2019(COVID-19)pneumonia outbreak started in December *** March 12,2020,the World Health Organization(WHO)declared that the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)constitutes a pandemic,and as of May 2021,SARS-CoV-2 has infected over 167.3 million patients,including 3.4 million deaths,reported to *** this review,we will focus on the relationship between SARS-CoV-2 infection and the *** will discuss how chronic liver diseases affect the COVID-19 disease course and *** will also discuss the SARS-CoV-2 effects on the liver,mechanisms of acute liver injury,and potential management plans.

关键词： COIVD-19 SARS-CoV-2 Liver diseases Transaminases Non alcoholic fatty liver Hepatocellular carcinoma

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Effect of a normal protein diet on oxidative stress and organ damage in malnourished rats

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Frontiers in Biology 2018年第5期13卷 366-375页

作者： Hanane Gourine Hadria Grar Wafaa Dib nabila Mehedi ahmed Boualga Djamel Saidi Omar Kheroua Laboratory of Physiology of Nutrition and Food Safety Department of Biology Faculty of Natural and Life Science University of Oranl Ahmed Ben Bella 31000 Oran Algeria Laboratory of Clinical and Metabolic Nutrition Department of Biology Faculty of Natural and Life Science University of Oranl Ahmed Ben Bella 31000 Oran Algeria

BACKGROUND： We investigated the effects of three weeks of renutrition with a normal protein diet on oxidant/antioxidant status in malnourished rats using biochemistry and histology. METHODS： Eighteen young Wistar rats were divided into three groups： control group was fed on a normal protein diet; malnourished group was fed on low protein diet and renourished group was fed on low protein diet followed by a normal protein diet. Serum albumin was evaluated. Malondialdehyde, protein carbonyl, superoxide dismutase and catalase levels were determined in the intestine, muscle and liver. Intestinal and hepatic damage were assessed by histological examination. RESULTS： Protein malnutrition resulted in a significant decrease of body weight, albumin level, villus length, intraepithelial lymphocytes counts （IELC） and superoxide dismutase level （liver and muscle）. However, catalase activity increased significantly in muscle and gut but there was no difference in liver. In all organs, malondialdehyde and protein carbonyl content of malnourished group showed a significant increase. Interestingly, a normal protein diet for three weeks resulted in a return to normal levels of superoxide dismutase, albumin, malondialdehyde and protein carbonyl in all organs. Catalase activity decreased in the muscle and gut and exhibited no significant difference in the liver. The renutrition diet enhanced also the recovery of intestinal epithelium by increasing villus length. Hepatic damage of rats fed normal protein diet was markedly reduced （macrovesicular steatosis decreased by 45%）. CONCLUSION： The normal protein diet could improve the oxidant/antioxidant imbalance and organ damage induced by protein malnutrition.

关键词： normal protein diet organ damage oxidative stress protein malnutrition rat

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Effect of the Variety of Fig Tree on Some Biological Parameters of Ceratitis capitata Wied, 1824 （Diptera： Trypetidae） in Some Orchards in the Kabylie

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Journal of Life Sciences 2012年第3期6卷 312-319页

作者： Sadoudi-Ali ahmed Djamila nabila Rezoug Ferroudja Saiki Noreddine Soltani M. Mammeri University Tizi-Ouzou 15000 Algeria Dadji Mokhtar University Annaba 23000 Algeria

The Mediterranean fruit fly, Ceratitis capitata Wied. （1824） is one of the most important pest that can infest orchards if its spread is not controlled. Among the preventive measures recommended in the fight against this pest, we are interested in looking for varieties that are less favorable to the development of this pest among different varieties of fig trees in our region. The biological parameters of the fruit fly which were followed in this study are duration of pupation, rate of emergence, sex ratio and longevity of males and females. The results show that these parameters vary depending on the variety of fruit.

关键词： Ceratitis capitata varieties of figs pupae pupation emergence sex ratio longevity.

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Fabrication and Characterization on Physico-Mechanical and Structural Properties of Sawdust Reinforced Acrylonitrile Butadiene Styrene (ABS) Composites

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Materials Sciences and Applications 2020年第9期11卷 644-658页

作者： Budrun Neher nabila Tasnim Nova Rakib Hossain M. A. Gafur Farid ahmed Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Physics Bangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh PP and PDC Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

The sawdust reinforced Acrylonitrile Butadiene Styrene (ABS) composites were prepared by using hot press molding machine for five different wt% (0%, 5%, 10%, 15% and 20%) at 180°C temperature and 50 KN load. Sawdust was collected from local saw mill of Savar, Dhaka, Bangladesh and ABS polymer was collected from local market of Dhaka, Bangladesh. In this study, different properties of composites like physical (bulk density and water absorption), mechanical (tensile properties and hardness) and structural (Fourier Transform Infrared Spectroscopy) properties were studied. The bulk density of composites was not altered consistently and it gave greater value for 5% and 20% composites. The water absorption enhanced for all composites with the accumulation of fiber content and soaking time. The reduction of tensile strength and Leeb’s rebound hardness of the composites were observed with the increase of the fiber content in all compositions. Maximum (%) of elongation was found for 5% composite, and then it gradually decreased;however, elastic modulus increased with the increased of fiber content in composites. Fourier Transform Infrared (FTIR) spectroscopy study was done for structural characterization. It was found that there was a new bond (C≡C) stretching formed for 20% composite;moreover, C-H rocking for 0% composite was broken for all other composites after the addition of sawdust in ABS polymer matrix.

关键词： Sawdust-ABS Composite Hot Press Molding Machine Tensile Strength Leeb’s Rebound Hardness FTIR Spectroscopy

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Preparation Characterization and Thermal Behaviour of Carbopol-TiO<sub>2</sub>Nanocomposites

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Open Journal of Organic Polymer Materials 2014年第3期4卷 55-64页

作者： Samia Chalal nabila Haddadine Naima Bouslah Sihem Souilah ahmed Benaboura Regis Barille A. Haroun Chemical Industries Research Division National Research Center Dokki Cairo Egypt Faculté de Chimie Laboratoire de Synthèse Macromoléculaire et Thio-Organique Macromoléculaire U.S.T.H.B. Algiers Algeria LUNAM Université Université d’Angers/UMR CNRS 6200 MOLTECH-Anjou Angers France

Composites consisting of carbopol (CP) and ceramic titanium dioxide nanoparticles, TiO2 have been investigated. The CP-TiO2, organic-inorganic hybrid composites have been prepared in DMF by heating the mixture with a constant rate of 1。C/min, up to 30。C, 45。C, 60。C, 80。C, 100。C and 120。C. Proprieties such as absorption, structure and external aspect of the obtained materials were investigated by Uv-vis, FTIR, DRX and SEM analyses. The X-ray diffraction patterns confirmed that the TiO2 nanoparticles maintained their original tetragonal anatase-type crystalline structure in the composites. The chemical structure of the obtained materials was determined by ATR-FTIR spectroscopy. The influence of TiO2 nanoparticles on the thermal proprieties of carbopol matrix was investigated using thermo-gravimetric analysis and differential scanning calorimetry. The glass transition temperature (Tg) of the carbopol matrix was considerably increased by the presence of ceramic feller nanoparticles and its thermal stability was significantly improved. Furthermore the water loss which represents 7.56% of the weight loss in pure CP at 100。C was avoided in the CP-TiO2 nanocomposites at this same temperature. This important finding revealed that ceramic fellers blocked the water loss in the modified carbopol nanocomposites, which stayed stable till 200。C.

关键词： Carbopol TiO2-Fellers Nanocomposite Thermal Proprieties FT-IR Spectroscopy

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Realization of Relative Humidity Scale Using NIS Two-Temperature Humidity Generator

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Journal of Physical Science and Application 2014年第8期4卷 484-487页

作者： Mohamed Gamal ahmed Said Mazen Doaa Abd El-Gelil nabila Ismail El Sayed National Institute for Standard Giza Egypt Physics Department Faculty of Science Zagazig University Sharkia Egypt

A new humidity calibration facility using a 2-T （two-temperature）, constant pressure principle for generating gas of known humidity has been developed at NIS for primary realization of relative humidity scale in the range from 13% to 98% for calibrating and testing hygrometers to improve the uncertainty. This paper reports the construction of the 2-T humidity generator describing its saturator and the test chamber system. Results of the efficiency tests of its saturator showed satisfactory generation performance for a primary realization of relative humidity scale. The expanded uncertainty of the relative humidity with a coverage factor k = 2 was found to be from ± 0.25 % to ± 0.67%.

关键词： Calibration relative humidity generator saturator uncertainty.

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华尔街首位并购女强人的闯荡之路

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商业周刊（中文版） 2021年第1期 24-25页

作者： nabila ahmed 许诺(译) 不详

在摩根大通公司(JPMorgan Chase)探寻其10多年来的第一笔重大收购交易之际,阿努·艾扬格(Anu Aiyengar)将参与到这家银行业巨头重塑未来的进程中。她是该行全球并购部门的联席主管,也是华尔街上担任这个职位的唯一一位有色人种和唯——... 详细信息

在摩根大通公司(JPMorgan Chase)探寻其10多年来的第一笔重大收购交易之际,阿努·艾扬格(Anu Aiyengar)将参与到这家银行业巨头重塑未来的进程中。她是该行全球并购部门的联席主管,也是华尔街上担任这个职位的唯一一位有色人种和唯——位女性。当年二十岁不到的她从印度来到美国就读史密斯大学,曾穿着5美元买的大衣在马萨诸塞州的严冬里瑟瑟发抖。

关键词：收购交易全球并购马萨诸塞州有色人种银行业华尔街史密斯女强人

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