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Ahammad, A. J. Saleh,Hasan, Md. Mahedi,Islam, Tamanna,Al-Shehri, Mohammod Oudah,Anju, Anjuman Nesa,Alam, Md. Kawsar,Kim, Jong-Pil,Qasem, Mohammed Ameen Ahmed,Aziz, Md. Abdul The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.6
<P>A highly selective and sensitive electrochemical method was developed for the detection of dopamine (DA), based on a gold nanoparticle (AuNP)-coated taro carbon (TC)-modified glassy carbon electrode (AuNP-TC/GCE). This novel AuNP-TC material was simply prepared by carrying out a pyrolysis of a composite material obtained by treatment of an acid-treated taro stem powder with HAuCl4. Transmission electron microscopy (TEM), Raman spectroscopy, field-emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were employed to characterize the AuNP-TC material. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to characterize the modified electrode. The modified GCE exhibited a well-defined current response only toward the electrochemical oxidation of DA in a mixture solution of ascorbic acid (AA), DA, and uric acid (UA). This designed electrochemical sensor showed a linear response in the concentration range of 0.5 μM to 250 μM DA and a sensing limit (S/N = 3) of 0.25 μM was found. The sensor was also able to successfully detect DA in a dopamine hydrochloride injection (DAI). Moreover, the sensor exhibited excellent stability and reproducibility.</P>
Ahammad, A.J. Saleh,Pal, Poly Rani,Shah, Syed Shaheen,Islam, Tamanna,Mahedi Hasan, Md.,Qasem, Mohammed Ameen Ahmed,Odhikari, Noyon,Sarker, Subrata,Kim, Dong Min,Abdul Aziz, Md. Elsevier 2019 Journal of Electroanalytical Chemistry Vol.832 No.-
<P><B>Abstract</B></P> <P>Aiming at constructing a new nonenzymatic electrochemical nitrite sensor, we have prepared a screen-printed fluorine-doped tin oxide (FTO) electrode with activated jute carbon paste (AJCP) (AJCP-SP-FTO) synthesized from jute (<I>Corchorus</I> genus) sticks by using ZnCl<SUB>2</SUB> as activating agent and subsequent carbonizing at 850°C. Surface morphology, textural properties, chemical composition and nature of pores of AJC were studied by FE-SEM, XRD, EDS, Raman spectroscopy and BET analysis. The surface area of the AJC was found to be 1452.4m<SUP>2</SUP>/g with an average pore diameter of 2.6nm obtained from a BJH pore-size distribution curve. Electron transfer capacity at the interface of the AJCP material screen-printed FTO was studied by cyclic voltammetry (CV) and EIS techniques. The AJCP-SP-FTO sensor was used for amperometric detection of nitrite. The limit of detection (LOD) for nitrite oxidation was found to be 437nM for the proposed sensor. The sensitivity of AJCP-SP-FTO toward nitrite was 863.71μAmM<SUP>−1</SUP> cm<SUP>−2</SUP>. From the analysis of electrochemical data, the effective surface area of the AJCP-SP-FTO was 0.12cm<SUP>2</SUP>. We proposed a mechanism for sensitive detection of nitrite based on analysis of experimental findings of spectroscopic and electroanalytical techniques. We further utilized the proposed sensor for analyzing nitrite in tap water. The AJCP-SP-FTO electrode showed good reproducibility and stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activated jute carbon (AJC) material was prepared by using ZnCl<SUB>2</SUB> as activating agent. </LI> <LI> Surface morphology, textural properties, chemical composition and nature of pores of AJC were studied. </LI> <LI> A novel AJC paste screen printed FTO electrode was constructed for nonenzymatic electrochemical determination of nitrite. </LI> <LI> The detection limit and sensitivity of nitrite were calculated to be 437 nM and 863.71 μA μM<SUP>-1</SUP> cm<SUP>-2</SUP>, respectively. </LI> <LI> A mechanism for detection of nitrite was proposed based on analysis of spectroscopic and electroanalytical techniques. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
EEIRI: Efficient Encrypted Image Retrieval in IoT-Cloud
( Zaid Ameen Abduljabbar ),( Ayad Ibrahim ),( Mohammed Abdulridha Hussain ),( Zaid Alaa Hussien ),( Mustafa A. Al Sibahee ),( Songfeng Lu ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.11
One of the best means to safeguard the confidentiality, security, and privacy of an image within the IoT-Cloud is through encryption. However, looking through encrypted data is a difficult process. Several techniques for searching encrypted data have been devised, but certain security solutions may not be used in IoT-Cloud because such solutions are not lightweight. We propose a lightweight scheme that can perform a content-based search of encrypted images, namely EEIRI. In this scheme, the images are represented using local features. We develop and validate a secure scheme for measuring the Euclidean distance between two descriptor sets. To improve the search efficiency, we employ the k-means clustering technique to construct a searchable tree-based index. Our index construction process ensures the privacy of the stored data and search requests. When compared with more familiar techniques of searching images over plaintexts, EEIRI is considered to be more efficient, demonstrating a higher search cost of 7% and a decrease in search accuracy of 1.7%. Numerous empirical investigations are carried out in relation to real image collections so as to evidence our work.
Mostafa A. Hussein,Refaat M. Shaker,Mohammed A. Ameen,Mohammed F. Mohammed 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.8
This study is concerned with the synthesis of new 1,2,4-triazoles, 1,3,4-thiadiazoles, and 1,3,4-thiadiazines derivatives. Derivatives 3a-i were obtained by condensation of 4-amino-3-(4-pyridine)-5-mercapto-1,2,4-triazole 1 with the appropriate aldehyde. Compounds 4a-i were synthesized in a one pot reaction involving compounds 3a-i, formaldehyde, and morpholine. Condensation of compound 1 with the appropriate acids or 4-substituted phenacyl bromide gave compounds 6a-d and 8a-f respectively. The chemical structures of the newly synthesized derivatives were elucidated using different spectral and elemental methods of analysis. All compounds were evaluated for their anti-inflammatory activity and the most potent derivatives were tested for their analgesic activity using indomethacin as a reference drug. In addition, ulcerogenicity and LD_50 for the most active compounds were evaluated. Moreover, the antibacterial activities of the newly synthesized derivatives were investigated.