Investigation of the Concentration of Metals in Two Economically Important Fish Species from the Caspian Sea and Assessment of Potential Risk to Human Health

Eisa Solgi,Hossein Alipour,Farshid Majnooni 한국해양과학기술원 2019 Ocean science journal Vol.54 No.3

Our specific objectives were to determine the concentrations of heavy metals (Cadmium, Lead, Arsenic, Mercury, Zinc, copper, Manganese and Cobalt) in the liver, gill, kidney and muscles of two economically important fish species, namely, Cyprinus carpio and Chelon aurata, from the Caspian Sea, as well as to examine the potential human health risks to fish consumers. Health risks associated with these heavy metals were assessed based on the target hazard quotients (THQs), Hazard index (HI) and Estimation of Daily Intake (EDI). The distribution pattern of Hg, As, Cd, Pb, Mn, Co, Cu and Zn in both fish species follows the order liver > gill > kidney > muscle. THQ and HI values determined for consumption of the two fish species were < 1 and EDI and EWI values were found to be below the PTDI and PTWI reference values. These findings indicated that the intake of metals via consumption of the muscles of both fish species does not represent an appreciable hazard to humans.

Synthesis of certain N-Aryl-N'-(2-pyrimidinyl)guanidine derivatives as potential antimicrobial agents

Eisa, H.M.,Tayel, M.A.,Yousif, M.Y.,El-Kerdway, M.M. The Pharmaceutical Society of Korea 1990 Archives of Pharmacal Research Vol.13 No.1

N-Aryl-N'(4-hydroxy-6-methyl-2-pyrimidinyl)guanidines (IIa-c) were prepared by cyclization of N-arybiguanides (Ia-c) with ethyl acetoacetate. Coupling of compounds (IIa-c) with the appropriate diazotized arylamine gave N-aryl-N'-(5-arylhydrazono-6-methyl-4-oxopyrimidin-2-yl) guanidines (IIIa-f). Whereas, their chlorination with phosphorus oxychloride followed by treatment of N-aryl-N'-(4-Chloro-6-methyl-2-pyrimidinyl)guanidimes (IVac) with the appropriate arylamine afforded the corresponding 4-arylamino derivatives (Vaf). Compounds (IIa-f) were also formed when compounds (1a-c) were treated with ethyl 2-arylhydrazono-3-oxobutyrates. The antimircobial testing of some of the prepared compounds against some pathogenic microorganisms revealed that only two have a marked effect against Escherichia coli.

Improving the flexural toughness behavior of R.C beams using micro/nano silica and steel fibers

Eisa, Ahmed S.,Shehab, Hamdy K.,El-Awady, Kareem A.,Nawar, Mahmoud T. Techno-Press 2021 Advances in concrete construction Vol.11 No.1

Experimental investigation has been conducted to study the effect of using Micro/Nano Silica in presence of steel fibers on improving the static response of reinforced concrete beams. Twenty-one mixtures were prepared with micro silica (MS), Nano silica (NS) and steel fibers (SFs) at different percentages. Cement was replaced by 10% and 15% of Micro silica and 1%, 2% and 3% of Nano silica in the presence of steel fibers at different volume fractions 0%, 1%, and 2%. 258 concrete samples, (126 cubes, 63 cylinders, 63 prisms, and six R.C beams), were investigated experimentally in two stages. The first stage was to investigate the mechanical properties of the prepared mixtures. The second stage was to study the static behavior of R.C beams, using the designed concrete mixtures, under a four-point flexural test. The results showed that replacing cement by (10% MS and 1% NS) produces the optimum mix with a significant improvement in the mechanical properties and the response of R.C beams under static loads. In addition, incorporating steel fibers at different volume fractions have a considerable effect on the flexural toughness of concrete mixes.

Infestation of the Longhorned Beetles Species (Cerambycidae) on Acacia seyal Del var. seyal in the Gum Arabic Belt of Sudan

Eisa, Maymoona Ahmed,Adam, Yahia Omar Institute of Forest Science 2010 Journal of Forest Science Vol.26 No.2

The Acacia seyal Del. var. seyal belongs to family Mimosaceae is known locally as gum Talha tree. It is a multipurpose tree species occurs throughout the African gum belt in Savannah mostly in pure forest. In Sudan it thrives on heavy clay soils that receive an annual rainfall between 400-800 mm. It is an important source of rural energy (fuelwood and charcoal) and forage. As mentioned by Nair (2007) the economic damage causes by insect in natural forest often difficult to judge due to no enough research attention The tree is frequently affected by biotic factors among them the insect pests. During a survey in the 1980's the tree was severely infested by the longhorned beetles (Cerambycidae) severely infesting other Acacia species, but the ecological data are overlooked. Therefore, the objective of the study was to assess infestation characteristics and to determine environmental factors triggering the attack of longhorned beetles. A temporary random sampling technique was applied to observe the damage characteristics of the longhorned beetles on tree species during May-July 2007. Five sample plots occupies by A. seyal were taken in Kordofan region directly observed for the presence of hole of emergence of the longhorned beetles, presence of dusts, presence of insect stages, girdling as well as other characteristics of damage. The study results indicate that the infestation rate of trees in the sampled sites ranged between zero and 23.08%. Further ecological researches are recommended.

Nickel nanorods over nickel foam as standalone anode for direct alkaline methanol and ethanol fuel cell

Eisa, Tasnim,Mohamed, Hend Omar,Choi, Yun-Jeong,Park, Sung-Gwan,Ali, Rafeeah,Abdelkareem, Mohammad Ali,Oh, Sang-Eun,Chae, Kyu-Jung Elsevier 2020 International journal of hydrogen energy Vol.45 No.10

<P><B>Abstract</B></P> <P>A highly electroactive nickel nanorod (NNR)/nickel foam (NF) electrode was fabricated for direct alcohol fuel cells (DAFCs) using a simple and cost-effective hydrothermal process. The Ni/NiO nanorods were successfully grown on the surface of an NF electrode, which strongly enhanced the anode wettability and increased surface area by 18 times (11.9 m<SUP>2</SUP> g<SUP>−1</SUP>), resulting in interfacial polarization resistance reduction. The NNR/NF electrode shows high electro-catalytic activity and great stability during alcohol oxidation. The current densities obtained for NNR/NF were four (479 mA cm<SUP>−2</SUP>) and six (543 mA cm<SUP>−2</SUP>) times higher than that for pristine NF in the cases of methanol and ethanol oxidations, respectively. This high current density can be attributed to the superhydrophilic surface of the Ni/NiO nanorods and corresponding high mass transfer capability between the electrolytes and Ni/NiO nanorods embedded on the surface of the electrodes. This study presents a new approach for using the novel NNR/NF as a cheap and high performance anode in DAFCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Unique Ni/NiO nanorods coated nickel foam (NNR/NF) electrodes were synthesized. </LI> <LI> Ni/NiO nanorods were grown on nickel foam through a simple hydrothermal process. </LI> <LI> Ni/NiO nanorods on the surface of NF enhanced wettability and area by 18 times. </LI> <LI> NNR/NF demonstrated 5-fold higher current generation than pristine NF electrode. </LI> <LI> Highly electrocatalytic NNR/NF showed efficient MeOH and EtOH electrooxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Synthesis of certain 2-aminoadmantane derivatives as potential antimicrobial agents

Eisa, Hassan M.,Tantawy, Atif S.,El-Kerdawy, Mohamed-M. The Pharmaceutical Society of Korea 1990 Archives of Pharmacal Research Vol.13 No.1

N-(2-Amamantyl)-N-(5-arylhydrazono-6-methyl-4-oxopyrimidin-2-yl) guanidines (IIIa, b), 2-(2-admantyl-amino)-4-amino-s-triazine (IVa) and its 6-chloromethyl derivative (IVb) were prepared by cylization of 1-(2-admantyl) biguanide HCl (I) with ethyl 2-arylhydrazono-3-oxobutyrates (II), ethyl formate and ethyl chloroacetate, respectively. Where 1-(2-admantyl)-3-(4, 5-dioxo-2-imidazolidinylidene)guanidine (V) was used as intermediate for the synthesis of amides (VIIa, b), hydrazide (VIII) and azomethine derivatives (IX, b) of alkyl 2-(2-admantyl-amino)-4-amino-2-triazine-6-carboxylates (VI a, b). The antimicrobial testing of the prepared compounds proved that compound 1Xb was the most active. It showed a marked bacteriostatic effect against Staphylococcus aureus and Bacillus subtilis.

Direct Urine Fuel Cell For Energy Recovery And Organic Nitrogen Waste Removal

Tasnim Eisa(Tasnim),Chae Kyu-Jung(채규정),Sung-Gwan Park(박성관),Mohammed Hussien,Mohammad Ali Abdelkareem,Jae-Kyung Jang(장재경) 대한환경공학회 2021 대한환경공학회 학술발표논문집 Vol.2021 No.11

Properties of Concrete Incorporating Recycled Post-Consumer Environmental Wastes

Ahmed Eisa 한국콘크리트학회 2014 International Journal of Concrete Structures and M Vol.8 No.3

The use of sustainable technologies such as supplementary cementitious materials, and/or recycled post-consumer environmental wastes is widely used in concrete industry in the last decade. This paper presents the results of a laboratory investigation of normal concrete containing sustainable technologies. Twenty one mixtures (21) were prepared with different combinations of silica fume, fly ash, olive’s seed ash, and corncob ash (CCA). Fresh and hardened concrete properties were measured, as expected the inclusion of the sustainable technologies affected both fresh and hardened concrete properties. Based on the results obtained in this study and the analyses conducted, the following observations were drawn: replacing the cement by olive’s seed ash or CCA has a significant effect on fresh concrete workability. Olive’s seed ash increased the slump by more than 200 % compared to the control mixtures. The compressive strength of mixtures containing olive’s seed ash showed by 45 and 75 % decrease compared to the control mixtures. The 28 days compressive strength of mixtures produced by CCA of 10 % replacement decreased by 41 % compared to the control mixture.

The Risk of Acute Myocardial Infarction in Patients With Gastroesophageal Reflux Disease

( Mohamed Eisa ),( Annumeet Sandhu ),( Ravi Prakash ),( Stephen J Ganocy ),( Ronnie Fass ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.4

Background/Aims A number of inflammatory mediators have been documented to be elevated in gastroesophageal reflux disease (GERD). Similar inflammatory mediators are involved in coronary artery disease. Thus, the aim of the study is to determine if GERD is a risk factor for developing acute myocardial infarction (AMI). Methods We used Explorys, a private cloud-based data store to which a number of health care systems feed information. We identified a cohort of GERD patients who have undergone an esophagogastroduodenoscopy compared to those without GERD. Incidence of AMI was studied after statistically controlling for known AMI risk factors. Results Total of 200 400 patients were included in the GERD group and 386 800 patients in non-GERD group. The primary event of AMI occurred in 17 200 patients in the GERD group (8.6%) vs 24 300 in non-GERD group (6.3%). Using logistic regression analysis and controlling for 6 major risk factors which included male gender (OR, 1.09; 95% CI, 1.07-1.11; P < 0.001), hypertension (OR, 6.53; 95% CI, 6.21-6.88; P < 0.001), hyperlipidemia (OR, 3.08; 95% CI, 2.96-3.20; P < 0.001), diabetes mellitus (OR, 1.72; 95% CI, 1.69- 1.76; P < 0.001), obesity (OR, 1.02; 95% CI, 1.00-1.04; P = 0.044), and smoking (OR, 1.38; 95% CI, 1.35-1.41; P < 0.001). The odds of developing AMI in the GERD population was 1.11 (95% CI, 1.08-1.13; P < 0.001). GERD had higher odds of developing AMI than male gender or obesity in our study. Conclusions This study demonstrated that GERD is a risk factor for AMI, higher than male gender and obesity. However, the increased risk may be clinically insignificant. (J Neurogastroenterol Motil 2020;26:471-476)

CUBIC SPLINE METHOD FOR SOLVING TWO-POINT BOUNDARY-VALUE PROBLEMS

Al Said, Eisa-A. 한국전산응용수학회 1998 Journal of applied mathematics & informatics Vol.5 No.3

In this paper we use uniform cubic spline polynomials to derive some new consistency relations. These relations are then used to develop a numerical method for computing smooth approxi-mations to the solution and its first second as well as third derivatives for a second order boundary value problem. The proesent method out-performs other collocations finite-difference and splines methods of the same order. numerical illustratiosn are provided to demonstrate the practical use of our method.